SDN1501E ES1 ASHRAE Level I and II Report.pdf

NORFOLK COUNTY CORRECTIONAL CENTER

ASHRAE Level II Energy Audit Report

WSP Project # B1502090.000

DCAMM Project # SDN1501E ES1

DCAMM Site Code: SDN00 Revised Final Report – As per 30% Design Package – Addendum A

April 6, 2016

Prepared For:

Division of Capital Asset Management and

Maintenance

One Ashburton Place Boston, MA 02108

ASHRAE Level II Energy Audit Report

Table of Contents

1. Executive Summary

1.1 Overview

1.2 Energy Conservation Measures Summary Table

1.3 Next Steps

2. Introduction

2.1 Overview

3. Methodology

3.1 Overview

3.2 Base Building Analysis

3.3 Energy Use Analysis

3.4 Energy Savings Calculations

3.5 Project Costs

4. Utility Information

4.1 Overview

4.2 Electricity

4.3 Natural Gas

4.4 Water & Sewer

4.5 Energy Benchmark and Performance Indicators

4.6 Energy Use Breakdown

4.7 Energy Cost Breakdown

5. Energy Conservation Measures ECM # 1.01 – Retrofit Interior Lighting Fixtures with LED and Install Lighting Control Sensors – Whole Campus . 16 ECM # 1.07 – Retrofit Exterior Lighting Fixtures with LED – Whole Campus ECM # 4.10 – Convert ACU’s 1 through 4 to Full DDC Actuation & Control and Optimize System ECM # 4.13(a) – Integrate ACU-7 and ACU-8 Operation with Occupancy Schedule – Main Building ECM # 4.13(b) – Integrate HV-2 Operation with Occupancy Schedule – Main Building ECM # 4.14(a) – Integrate Dishwasher Exhaust Fan with Dishwasher Operation – Main Building ECM # 4.14(b) – Integrate Laundry Exhaust Fan and Heating Ventilation Unit HV-3 with Occupancy Schedule ... 21 ECM # 4.14(c) – Install Demand Controlled Ventilation/Exhaust Controls for Kitchen ECM # 5.02(a) – Install Low Flow / Ultra Low Flow Fixtures for Water Closets, Faucets, Urinals ECM # 5.02(b) – Install a Computerized Water Conservation System for the Combi-Units and Showers ECM # 7.01 – Ozone Laundry System – Main Building ECM # 9.00 – Convert Multizone Units ACU-1 through ACU-4 to Variable Volume Units – Main Building ECM # 9.01 – Install VFD’s on Secondary HW Glycol Pumps P-3A & P-3B and ECM # 16.00 – Install Cogeneration System for Domestic Hot Water – Main Building ECM # 17.00(a) – Replace Unit Heater Thermostats with new DDC Thermostats – Whole Campus ECM # 17.00(b) – Optimize Fin Tube Radiation Heating System Control – Main Building ECM # 21.00 – Install Photovoltaic System on Main Building Roof – Main Building ECM # 23.00(a) – Walk-in Refrigerator / Freezer Controls

6. Renewable Energy Evaluation

6.1 Overview

6.2 Photovoltaic (PV) Array

6.3 Solar Thermal Hot Water

7. Utility Incentives

7.1 MassSave Program

7.1.1 Memorandum of Understanding (MOU)

8. Appendix

WSP Project # B1502090.000 DCAMM Project # SDN1501E ES1 DCAMM Site Code: SDN00

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1. Executive Summary

1.1 Overview

The Massachusetts Department of Capital Asset Management and Maintenance (DCAMM) has retained the services of WSP to perform an ASHRAE Level II Energy Audit for the Norfolk County Correctional Center (NCCC), located in Dedham, MA. Our services included a walk-through survey of the facility, utility bill analysis, energy and cost summary comparisons, low cost/no cost improvements and capital improvements. These opportunities to conserve energy have been investigated and included in Table 1.1 – ASHRAE Level II Energy Conservation Measures.

The combination of field surveys of the existing systems, engineering calculations using industry standard practices, and the application of energy efficient technologies were used to produce the results.

Note that this revision of the report was developed to only include energy conservation measures (ECMs) in the 30% design submission package dated 1/22/16.

Note that this revision of the report includes the following additional changes:

1. Updated Photovoltaic (PV) system narrative and savings (ECM 21.00)

2. Updated plumbing fixtures narrative with revised fixture quantities and implementation costs (ECM 5.02a)

3. Revised Appendix II – VJA Cost Estimation

4. Revised Table 1.1 – ASHRAE Level II ECMs

1.2 Energy Conservation Measures Summary Table

The energy conservation measures (ECMs) shown in Table 1.1 – ASHRAE Level II Energy Conservation Measures are explained in Section 5 of this report. It is important to note that each ECM was evaluated on an indi-vidual basis. If measures were to be combined and implemented simultaneously, values may differ from what is presented within this table.

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Table 1.1 – ASHRAE Level II Energy Conservation Measures

The energy conservation measures in the table above are in no particular order and do not have to be implemented as sequenced above.

1.3 Next Steps

The next step in the process is to prioritize and select the measures to be implemented based on the cost benefit analysis.

ECM#

Energy Conservation Measure

Description

Estimated

Implementation

Cost ($)

Potential

Incentive

Net

Implementation

Cost ($)

Electricity

Reduction

(kWh/yr)

Natural Gas

Reduction

(therms/yr)

Water

Reduction

(gal/yr)

Energy/Water

Cost

Reduction

($/yr)

Total Cost

Reduction

($/yr)

Simple

Payback

(years)

1 1.01

Retrofit Interior Lighting Fixtures with

LED and Install Lighting Control

Sensors

$517,078 $70,914 $446,164 363,389 0 0 $43,607 $43,607 10.2

2 1.07 Retrofit Exterior Lighting Fixtures with LED $129,109 $43,144 $85,965 172,623 0 0 $20,715 $20,715 4.1

3 4.10

Convert ACU’s 1 through 4 to Full

DDC Actuation & Control and

Optimize System

$142,465 $58,839 $83,626 183,738 10,324 0 $34,024 $34,024 2.5

4 4.13(a) Integrate ACU-7 and ACU-8

Operation with Occupancy Schedule $7,123 $0 $7,123 44,173 4,100 0 $10,057 $10,057 0.7

5 4.13(b) Integrate HV-2 Operation with

Occupancy Schedule $1,425 $0 $1,425 3,788 2,900 0 $3,819 $3,819 0.4

6 4.14(a) Interlock Dishwasher Exhaust Fan with Dishwasher Operation $4,801 $0 $4,801 1,472 0 0 $177 $177 27.2

7 4.14(b)

Integrate Laundry Exhaust Fan LX-1 and Heating Ventilation Unit HV-3 with Occupancy Schedule

$1,995 $0 $1,995 11,033 579 0 $1,996 $1,996 1.0

8 4.14(c )

Install Demand Controlled

Ventilation/Exhaust Controls for

Kitchen Exhaust Fan KX-1 and

Heating Ventilation Unit HV-1

$35,118 $10,000 $25,118 65,704 8,945 0 $18,261 $18,261 1.4

9 5.02(a)

Install Low Flow / Ultra Low Flow

Fixtures for Water Closets, Faucets, Urinals, and Showerheads serving

Admin/Staff Areas

$103,875 $0 $103,875 0 0 216,377 $1,270 $1,270 81.8

10 5.02(b)

Install a Computerized Water

Conservation System for the Combi-

Units and Showers Serving Inmates.

Replace Inmate Showerheads with

New Low-Flow Showerheads

$827,723 $0 $827,723 0 0 6,657,600 $39,068 $39,068 21.2

11 7.01 Ozone Laundry System $25,000 $5,000 $20,000 0 9,491 345,086 $13,034 $13,034 1.5

12 9.00

Convert Multizone Units AC-1 through AC-4 to Variable Volume

Units

$302,454 $7,440 $295,014 33,237 -695 0 $3,182 $3,182 92.7

13 9.01

Install VFD's on Secondary HW

Glycol Pumps P-3A & P-3B and

Convert the Existing HW Boiler

System to DDC and Connect to the new BMS

$32,625 $17,432 $15,193 83,604 -2,775 0 $6,814 $6,814 2.2

14 16.00 Install Cogeneration System for

Domestic Hot Water $336,289 $75,000 $261,289 511,584 -25,730 0 $31,543 $31,543 8.3

15 17.00(a) Replace Unit Heater Thermostats with new DDC Thermostats $9,916 $0 $9,916 1,004 32,370 0 $37,669 $37,669 0.3

16 17.00(b) Optimize Fin Tube Radiation Heating

System Control $22,794 $0 $22,794 28,343 8,926 0 $13,755 $13,755 1.7

17 21.00 Install PV System on Main Building

Roof $1,104,000 $0 $1,104,000 180,728 0 0 $21,687 $21,687 50.9

18 23.00(a) Walk-in Refrigerator / Freezer

Controls $21,370 $7,764 $13,606 31,055 0 0 $3,727 $3,727 3.7

ESTIMATED TOTAL $3,625,160 $295,533 $3,329,627 1,715,473 48,435 7,219,062 $304,404 $304,404 10.9

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2. Introduction

2.1 Overview

This report represents the results of the ASHRAE Level II Energy Audit performed for the Norfolk County Correctional Center (NCCC) located in Dedham, MA.

An ASHRAE Level II Energy Audit is an excellent way to reduce energy consumption through low cost improvements, which optimize building systems to operate efficiently and effectively. On average, implementing measures associated with an ASHRAE Level II Energy Audit can reduce the energy costs by 5% to 20%. The payback for the investment in low cost opportunities typically ranges from a few months to two years. With a good preventative maintenance program, problems that arise over time can be reduced and potentially caught before major issues develop. Additionally, implementing measures associated with an energy audit can improve occupant comfort, reduce indoor air quality problems, and reduce operations and maintenance costs.

The energy auditing process also identifies potential capital improvements that can be made at the facility to further reduce energy usage and utility costs. Often, the savings associated with the low cost improvements can be used to “buy down” the implementation costs associated with the capital measures and make the overall package more economically viable.

A facility description has been provided to DCAMM and the site team in a separate document. That document is titled Facility Description Report.

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3. Methodology

3.1 Overview

WSP analyzed the site interview data, written documentation, trending data, and monthly energy summaries, including electricity and natural gas for 2013-2014

3.2 Base Building Analysis

The energy baseline for this building was established through the use of the eQUEST v.3.64. eQUEST v.3.64 calculates hour-by-hour building energy consumption over an entire year using hourly climate data for the location under consideration. Inputs to eQUEST v.3.64 consist of a detailed description of the building being analyzed including hourly scheduling of occupants, lighting, equipment, and thermostat settings. It provides accurate simulation of such building features as shading, fenestration, interior building mass, envelope building mass and dynamic response of differing heating and air conditioning systems types and control strategies.

The energy simulation process begins by developing a baseline model of the building based on building plans, specifications as well as through discussions with the building operators, occupants, and maintenance personnel.

Once set points, load shapes, and schedules are input, the model is then run with climate data corresponding to this geographic location (Dedham, MA).

At this point, the model results are compared to the actual monthly energy usage obtained from energy bills and a correlation of electrical consumption is developed. Typically, if there are discrepancies larger than 10% for any month, further tuning of the model is performed. Overall, the billing data compared to the modeled data is within 10%.

A plot of the monthly electrical consumption predicted by the baseline model verses the actual billing data is presented in Figure 3.1.

Figure 3.1 – NCCC – Modeled Electricity vs. Actual

2,000

4,000

6,000

8,000

10,000

12,000

1 2 3 4 5 6 7 8 9 10 11 12 k W h /D a y /M o n th

Month

NCCC - Actual vs Design Case Energy Model (kWh)

Exterior

DHW

HP Sup

Refrig

Fans

Pumps

Towers

Cool

Heat

Equip

Task

Lights

Actual

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Figure 3.2 – NCCC – Modeled Natural Gas vs. Actual

As shown in the preceding graph, the model tracks the actual energy usage profiles for the building. Since eQUEST v.3.64 uses historic weather data in its calculations, minor differences between the model and actual consumption can most likely be attributed to local weather anomalies occurring during the billing period.

Once the baseline model is calibrated, parametric analyses are performed by making changes to the model corresponding to energy conservation measures identified during the building walk-through audit and from analysis of the monitored data. These parametric analyses result in predicted utility consumption and savings, and are ultimately used to evaluate the best combination of energy conservation alternatives through further economic analysis of the individual and combined energy efficient measures.

3.3 Energy Use Analysis

The baseline building model and building utility analysis was also used to determine the breakdown of existing energy usage for various pieces of equipment in the facility (end-use-profile) and the overall energy usage per square foot (energy use index). The end-use profile allows the user to see where all of the energy is being used in the facility and where the greatest opportunities for energy conservation exist. The energy use index can be used to compare energy usage in the existing facility against similar building types under similar weather conditions. For example, multiple office facilities in similar climates can be compared to each other and the ones with the highest energy use per square foot may have greater opportunities for energy conservation. Refer to the Utility Information section for detailed discussion of existing energy usage at the facility.

3.4 Energy Savings Calculations

Energy savings can be calculated in a variety of ways. For simple measures, customized spreadsheets based on standard engineering practices and rules of thumb can be used to estimate savings. For the evaluation of more complex systems and to account for equipment interactions, a simulation program calculating energy usage on an hourly basis can be used. For this project both spreadsheets and model simulation was used to estimate energy savings.

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Cost savings are generally calculated using the average unit cost per utility. For example, the average cost of electricity is calculated by dividing the total monthly cost, which includes demand costs and taxes, by the monthly consumption. The methodology used to calculate costs savings associated with each ECM is provided in the table below.

ECM # ECM Description Savings Calcula-tion Method

1 1.01 Retrofit Interior Lighting Fixtures with LED and Install Lighting Control Sensors Spreadsheet

2 1.07 Retrofit Exterior Lighting Fixtures with LED Spreadsheet

3 4.10 Convert ACU’s 1 through 4 to Full DDC Actuation & Control and Optimize System Energy Model

4 4.13(a) Integrate ACU-7 and ACU-8 Operation with Occupancy Schedule Energy Model

5 4.13(b) Integrate HV-2 Operation with Occupancy Schedule Energy Model

6 4.14(a) Interlock Dishwasher Exhaust Fan with Dishwasher Operation Energy Model

7 4.14(b) Integrate Laundry Exhaust Fan LX-1 and Heating Ventilation Unit HV-3 with Occupancy Schedule Energy Model

8 4.14(c ) Install Demand Controlled Ventilation/Exhaust Controls for Kitchen Exhaust Fan KX-1 and Heating Ventilation Unit HV-1

Energy Model

9 5.02(a) Install Low Flow / Ultra Low Flow Fixtures for Water Closets, Faucets, Urinals, and Showerheads serving Admin/Staff Areas

Spreadsheet

10 5.02(b) Install a Computerized Water Conservation System for the Combi-Units and Showers Serving In-mates. Replace Inmate Showerheads with New Low-Flow Showerheads

Spreadsheet

17 7.01 Ozone Laundry System Spreadsheet

11 9.00 Convert Multizone Units AC-1 through AC-4 to Variable Volume Units Energy Model

12 9.01 Install VFD's on Secondary HW Glycol Pumps P-3A & P-3B and Convert the Existing HW Boiler System to DDC and Connect to the new BMS

Energy Model

13 16.00 Install Cogeneration System for Domestic Hot Water Spreadsheet

14 17.00(a) Replace Unit Heater Thermostats with new DDC Thermostats Energy Model

15 17.00(b) Optimize Fin Tube Radiation Heating System Control Energy Model

16 23.00(a) Walk-in Refrigerator / Freezer Controls Spreadsheet

18 21.00 Install PV System on Main Building Roof PVWatts Software

3.5 Project Costs

Preliminary implementation costs were investigated by VJ Associates and are incorporated into the economic analysis of energy conservation measures shown in Section 5. Refer to Appendix II for VJ Associates Cost Estimate.

The estimate provided by VJ Associates includes the following qualifications and clarifications:

1. Labor costs included at local union rates.

2. The following mark ups area used:

a. General Conditions 10.00%

b. Insurance & Bond 3.50%

c. Insurance & Bond 3.50%

d. Building Permit 1.00%

e. Contractor's (CM/GC) Fee 4.00%

f. Design Contingency (by DCAMM) 0.00%

g. Estimating Contingency 10.00%

h. Construction Contingency (by DCAMM) 0.00%

i. Escalation Contingency 4.50%

3. The estimate assumes all long-lead items can be pre-purchased to meet schedule requirements.

4. The estimate is based on the premise that the design will meet all codes, laws, ordinances, rules, & regulations in effect at the time that the estimate was prepared. The estimate shall be adjusted should any discrepancies between design & the aforementioned codes, laws or ordinances result in, or require, an increase in the cost of the work.

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The estimate excludes the following:

1. A-E Fees

2. Overtime

3. Sales Tax

4. Loose furniture and equipment

5. Loose technology equipment ( i.e. Computers, Printers, Etc. )

6. Telecom/Security/Equipment devices & wiring excluded. A/V equip. & wiring excluded.

7. Conduits, raceways, back boxes only included for Telecoms/Security.

8. Special seismic requirements

9. Third party commissioning costs

10. Work associated with the removal or remediation of asbestos containing materials

11. Testing or inspection services, as required by State Building Code or other: concrete, soils, pavement, fireproofing.

12. Costs associated with air monitoring/clearance sampling

13. Tenant relocation costs

14. Builder’s Risk Insurance

15. All design contingency and construction contingency values are not included (assumed by owner)

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4. Utility Information

4.1 Overview

Table 4.1 below provides a summary of all utility accounts: electricity, natural gas, and water for the year 2014. An analysis of each individual utility is provided in the following sections.

Direct Energy

(Supplier)

Cost

NSTAR

(Distributor)

Cost

NSTAR

Distribution Cost

(All 3 meters billed together)

Acct # 1067097 Acct # 2611 473

Therms

Supplier

Cost Therms

Supplier

Cost Therms

Supplier

Cost

Acct # 1619 041

231,600 $17,000 $9,579 $26,578 $0.11 3,160 $2,706 617 $529 20,072 $17,191 23,849 $7,755 $28,181 $1.18 2,174,436 $12,567 $0.00578

242,520 $17,801 $9,484 $27,285 $0.11 3,026 $2,592 692 $593 25,226 $21,605 28,944 $9,365 $34,155 $1.18 1,875,984 $10,903 $0.00581

239,160 $17,554 $9,385 $26,940 $0.11 2,317 $1,984 718 $615 15,049 $12,889 18,084 $5,901 $21,389 $1.18 1,740,596 $10,148 $0.00583

226,080 $16,594 $11,167 $27,761 $0.12 1,309 $1,121 624 $534 13,603 $11,651 15,536 $4,308 $17,614 $1.13 1,850,552 $10,761 $0.00582

269,760 $19,800 $13,906 $33,706 $0.12 21 $18 558 $478 7,853 $6,726 8,432 $2,951 $10,172 $1.21 2,004,640 $11,620 $0.00580

333,600 $24,486 $17,648 $42,134 $0.13 21 $18 558 $478 7,853 $6,726 8,432 $2,951 $10,172 $1.21 1,828,860 $10,846 $0.00593

311,880 $22,892 $17,248 $40,140 $0.13 16 $14 525 $450 4,716 $4,039 5,257 $1,155 $5,657 $1.08 2,346,476 $13,787 $0.00588

324,000 $23,782 $16,843 $40,625 $0.13 20 $17 564 $483 6,334 $5,425 6,918 $1,463 $7,388 $1.07 2,304,588 $13,549 $0.00588

298,800 $21,932 $14,719 $36,651 $0.12 145 $124 557 $477 8,121 $6,955 8,823 $1,815 $9,372 $1.06 2,062,236 $12,172 $0.00590

252,480 $18,532 $12,184 $30,716 $0.12 711 $610 572 $491 17,853 $15,314 19,136 $4,532 $20,947 $1.09 2,232,780 $13,336 $0.00597

217,800 $15,987 $9,476 $25,462 $0.12 1,791 $1,541 282 $243 5,624 $4,840 7,697 $2,627 $9,251 $1.20 2,093,652 $12,351 $0.00590

259,920 $18,974 $9,367 $28,341 $0.11 2,161 $1,860 123 $106 24,462 $21,051 26,746 $8,628 $31,645 $1.18 2,020,348 $11,934 $0.00591

3,207,600 $235,335 $151,005 $386,340 $0.12 14,697 $12,604 6,390 $5,475 156,766 $134,413 177,853 $53,450 $205,943 $1.16 24,535,148 $143,976 $0.00587

Electricity

Meter S001450

(DAC Building)Total

Electric

Cost

Electric Rate

($/kWh)

Energy

Usage

(kWh)

Nominal

Water Rate

($/gallon)

Water

Water Usage

(gallons)

Acct # 9199

Total Cost

Natural Gas

Meter P159901 / Meter

P118740 (Vehicle

Maintenance Building)

Meter D000202 /

Meter 9334030

(Main Building) Total Gas

Usage

(therms)

Total Cost

Nominal

Gas Rate

($/therms)

Table 4.1 - 2014 Summary of Utilities

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4.2 Electricity

The campus primarily uses electricity to meet its cooling, plugs, and lighting needs. The campus consumed 3,207,600 kWh of electricity at a cost of $386,340 (including demand charges, taxes, fees, etc.) for the 12-month period between January 2014 and December 2014. This corresponds to an energy use index of 70.8 kBTU/SF/Year and an energy cost index of $2.50/SF/Year. Electricity consumption and demand for the campus for 2014 is summarized in Table 4.2 below:

Table 4.2 - 2014 Electrical Consumption Data

Month Energy Usage

(kWh) Demand

(kW) Total Cost

Electric Rate ($/kWh)

Energy Cost Index

($/SF)

EUI

(kBtu/SF)

Jan-14 231,600 412 $26,578 $0.11 $0.17 5.1

Feb-14 242,520 405 $27,285 $0.11 $0.18 5.4

Mar-14 239,160 391 $26,940 $0.11 $0.17 5.3

Apr-14 226,080 453 $27,761 $0.12 $0.18 5.0

May-14 269,760 515 $33,706 $0.12 $0.22 6.0

Jun-14 333,600 589 $42,134 $0.13 $0.27 7.4

Jul-14 311,880 579 $40,140 $0.13 $0.26 6.9

Aug-14 324,000 565 $40,625 $0.13 $0.26 7.2

Sep-14 298,800 528 $36,651 $0.12 $0.24 6.6

Oct-14 252,480 530 $30,716 $0.12 $0.20 5.6

Nov-14 217,800 418 $25,462 $0.12 $0.16 4.8

Dec-14 259,920 408 $28,341 $0.11 $0.18 5.7

2014 Summary: 3,207,600 483 $386,340 $0.12 $2.50 70.8

Figure 4.1 shows kWh use and kW demand over the one-year period from January 2014 to December 2014. As shown in the graphical analysis, the electrical consumption (kWh) tracks the electrical demand (kW).

Figure 4.1 – 2014 Electrical Consumption kWh vs. kW Demand

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Figure 4.2 illustrates the monthly kilowatt-hour usage plotted with cooling degree-days (CDDs). For a better representation of electric consumption trends, utility data was analyzed over a two year period. Since the campus is cooled via purchased electricity that energizes the cooling towers and chillers, it is important to understand that electricity usage is directly tied to cooling degree-days. One would expect that as the cooling degree days increase, the campus electricity consumption would increase as well.

Figure 4.2 – 2013 and 2014 Monthly Electrical Usage vs. Cooling Degree Days

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4.3 Natural Gas

The campus uses natural gas to fuel the hot water boilers providing building hot water to the downstream equipment.

Natural gas is also used to fuel the domestic hot water boilers. The campus consumed 177,853 therms of natural gas at a cost of $205,943 (including taxes, fees, etc.) for the 12-month period between January 2014 and December 2014. This corresponds to an energy use index (EUI) of 115.1 kBTU/SF/Year and an energy cost index of $1.33/SF/Year. Gas consumption for campus for 2014 is summarized in Table 4.3 below.

Table 4.3 – 2014 Natural Gas Consumption Data

Month Gas Usage

(therms) Total Cost

Nominal Gas Rate ($/therms)

Energy Cost Index

($/SF)

EUI

(kbtu/SF)

Jan-14 23,849 $28,181 $1.18 $0.18 15.4

Feb-14 28,944 $34,155 $1.18 $0.22 18.7

Mar-14 18,084 $21,389 $1.18 $0.14 11.7

Apr-14 15,536 $17,614 $1.13 $0.11 10.1

May-14 8,432 $10,172 $1.21 $0.07 5.5

Jun-14 8,432 $10,172 $1.21 $0.07 5.5

Jul-14 5,257 $5,657 $1.08 $0.04 3.4

Aug-14 6,918 $7,388 $1.07 $0.05 4.5

Sep-14 8,823 $9,372 $1.06 $0.06 5.7

Oct-14 19,136 $20,947 $1.09 $0.14 12.4

Nov-14 7,697 $9,251 $1.20 $0.06 5.0

Dec-14 26,746 $31,645 $1.18 $0.20 17.3

2014 Summary: 177,853 $205,943 $1.16 $1.33 115.1

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As seen in Figure 4.3 below, natural gas usage increases during the winter months as heating degree days (HDDs) increase. For a better representation of natural gas trends, utility data was analyzed over a two year pe-riod.

Figure 4.3 – 2013 and 2014 Monthly Natural Gas Usage vs. Heating Degree Days

Note that the November 2014 natural gas comparison is significantly low, and does not correlate with HDDs. As per discussion with the facilities team at NCCC, there was an issue with the gas regulator during this billing period. The gas regulator and meter were replaced in December 2014 to resolve the issue.

Low Nov-14 usage due to malfunctioning gas regulator

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4.4 Water & Sewer

The campus consumes potable water year-round which serves the flow fixtures (faucets, toilets, showers).

Additionally, potable water is circulated through the cooling tower to reject heat. Table 4.4 below summarizes water consumption for the year 2014.

Table 4.4 - 2014 Water Consumption Data

Month Water Usage (gallons) Total Cost Gallons per SF Gallons per Day

Jan-14 2,174,436 $12,567 14.1 74,981

Feb-14 1,875,984 $10,903 12.1 60,516

Mar-14 1,740,596 $10,148 11.3 62,164

Apr-14 1,850,552 $10,761 12.0 59,695

May-14 2,004,640 $11,620 13.0 66,821

Jun-14 1,828,860 $10,846 11.8 58,995

Jul-14 2,346,476 $13,787 15.2 78,216

Aug-14 2,304,588 $13,549 14.9 74,342

Sep-14 2,062,236 $12,172 13.3 66,524

Oct-14 2,232,780 $13,336 14.5 74,426

Nov-14 2,093,652 $12,351 13.6 67,537

Dec-14 2,020,348 $11,934 13.1 67,345

2014 Summary: 24,535,148 $143,976 158.8 67,590

Table 4.5 below shows water consumption in comparison to CDDs. Water consumption is expected to increase as CDDs increase. For better representation, data analysis was done for calendar years 2013 & 2014.

Figure 4.4 – 2013 and 2014 Monthly Water Usage vs. Cooling Degree Days

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4.5 Energy Benchmark and Performance Indicators

The overall energy usage profile for the campus is more than normal based on its current operation and comparison to similar campuses. Electricity consumption is 43% more than the benchmark while natural gas consumption is 181% more than the benchmark. The comparison to the Commercial Building Energy Consumption Survey (CBECS) was taken from different tables. It appears that energy use at Norfolk County Correctional Center falls 106% more than energy use of an average campus of similar size, usage, date built, and region. CBECS data was derived from the following website:

http://www.eia.doe.gov/emeu/cbecs/cbecs2003/detailed_tables_2003/detailed_tables_2003.html#enduse03

Table 4.5 compares this campus to the CBECS data to provide a comparison as to where this correction center falls throughout the country.

Table 4.5 - 2014 Energy Use Index Date of CBECS

Table Table

Number Fuel Type

CBECS Data* (kbtu/SF/Year)

Norfolk County Correctional Center

Variance

Annual Savings From CBECS

2003 Public Order and Safety

E4A Electricity 49.9 71.3 43% ($166,020)

2003 Public Order and Safety

E7A Natural

Gas

41.5 116.4 181% ($372,492)

Total: 91.4 187.8 106% ($538,512)

As seen in the EUI comparison above, Norfolk County Correctional Center uses more overall energy in comparison with campuses of similar size and use.

*Please note, the CBECS data figure for natural gas and electricity was derived from an average of four different end-use numbers compared to similar campuses under different criteria. See Table 4.6 below:

Table 4.6 - Electrical Consumption Intensities by End Use

Category Electricity EUI Natural Gas EUI Total EUI

(kbtu / SF / Year) (kbtu / SF / Year) (kbtu / SF / Year)

100,000-200,000 SF 53.5 36.5 90

Public Order and Safety 52.3 45 97.3

1990-1999 Construction 57.1 37.5 94.6

North East- New England 36.7 46.8 83.5

Average: 49.9 41.5 91.4

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4.6 Energy Use Breakdown

Figure 4.5 below illustrates the breakdown of annual energy consumption by end-use. These end-use percentages were derived from the utility bills and energy modeling.

Figure 4.5 - End-Use Comparison

4.7 Energy Cost Breakdown

Figure 4.6 below illustrates the breakdown of the energy costs per utility (water, natural gas, and electricity). These end-use percentages were derived from the 2014 utility bills.

Figure 4.6 - 2014 Energy Cost Breakdown per Utility

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5. Energy Conservation Measures

ECM # 1.01 – Retrofit Interior Lighting Fixtures with LED and Install Lighting Control Sensors – Whole Campus

Existing Conditions:

A lighting audit was completed for the building in order to identify potential lighting savings and incentives that may be pursued.

Main Building:

Lighting within the central unit corridors primarily consists of 1’ x 1’ 135W metal halide fixtures. During the walkthrough, it was noted that every alternate fixture was on. Lighting within the pod corridors consists of T8 fluorescent fixtures. Lighting within the cells primarily consists of T8 fluorescent fixtures. Directly outside each cell, is a 9W compact fluorescent lamp. There are 10 high bay 250W metal halide fixtures in each of the pods. During the walkthrough, it was noted that only four (4) of the metal halide lamps were energized. There are additional metal halide fixtures in the gym.

DAC Building:

Lighting with the corridors consists of 4’ T8 fluorescent fixtures with two (2) lamps per fixture. There are four (4) high bay metal halide lamps in the lobby. Each cell consists of one (1) 4’ T8 fluorescent fixture with two (2) lamps per fixture.

All lighting on the campus is manually controlled.

Recommendations:

It is recommended the lamps be replaced with LED. The table below shows the recommended replacements. Please refer to Appendix I – Griffin Electric Fixture Matrix for descriptions of the existing fixture codes.

Fixture Code

(Refer to

Appendix I)

Device Description QTY Total Cost Requested

Incentive

Net Cost of

Installation

Total kW

Saved

Estimated

Existing

Hrs/Week

Annual kWh Saved

Estimated

$ Saved

Simple

Payback

1 A 3/14W LED T8 Lamp & Ballast 187 $21,872 $7,959 $13,912 7.29 40 15,169 $1,827 7.6

2 B 20 WATT LED 2' reflector kit 43 $5,437 $1,979 $3,459 1.72 60 5,366 $646 5.4

3 B1 2/12W LED T8 reflector kit 65 $8,449 $3,075 $5,374 3.84 60 11,965 $1,441 3.7

4 C 2/12W LED T8 reflector kit 9 $1,170 $426 $744 0.53 60 1,657 $200 3.7

5 D 20 WATT LED 2' reflector kit 10 $1,265 $460 $804 0.40 60 1,248 $150 5.4

6 D1 20 WATT LED 2' reflector kit 4 $506 $184 $322 0.16 60 499 $60 5.4

7 D2 2/14W LED T8 Lamp & Ballast 30 $2,715 $988 $1,727 0.81 60 2,527 $304 5.7

8 D3 2/14W LED T8 Lamp & Ballast 23 $2,082 $758 $1,324 0.62 60 1,938 $233 5.7

9 D4 2/12W LED T8 reflector kit 2 $260 $95 $165 0.12 60 368 $44 3.7

10 D5 2/12W LED T8 reflector kit 1 $130 $47 $83 0.06 60 184 $22 3.7

11 F 22 WATT LED Special Fixture 6 $992 $361 $631 0.07 60 225 $27 23.3

12 F1 22 WATT LED Special Fixture 54 $8,928 $3,249 $5,679 3.13 60 9,772 $1,177 4.8

13 H 20 WATT LED 2' reflector kit 88 $11,128 $4,050 $7,078 3.52 60 10,982 $1,323 5.4

14 H1 2/14W LED T8 Lamp & Ballast 83 $7,512 $2,734 $4,778 2.24 60 6,992 $842 5.7

15 H2 2/12W LED T8 reflector kit 24 $3,120 $1,135 $1,984 1.42 168 12,370 $1,490 1.3

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16 H3 3/12W LED T8 reflector kit 68 $10,452 $3,804 $6,648 4.62 60 14,427 $1,738 3.8

17 H4 3/12W LED T8 reflector kit 1 $154 $56 $98 0.07 60 212 $26 3.8

18 K No Recommendation 145 $0 $0 $0 2.61 $0

19 L 20 WATT LED 2' reflector kit 29 $3,667 $1,335 $2,333 1.16 60 3,619 $436 5.4

20 L1 2/14W LED T8 Lamp & Ballast 12 $1,086 $395 $691 0.32 60 1,011 $122 5.7

21 L2 2/12W LED T8 reflector kit 25 $3,250 $1,183 $2,067 1.48 60 4,602 $554 3.7

22 L3 2/12W LED T8 reflector kit 13 $1,690 $615 $1,075 1.08 60 3,366 $405 2.7

23 M 2/14W LED T8 Lamp & Low Pw r Ballast 32 $2,896 $1,054 $1,842 0.99 84 4,333 $522 3.5

24 N 2/14W LED T8 Lamp & Low Pw r Ballast 38 $3,439 $1,252 $2,188 1.18 168 10,291 $1,240 1.8

25 N1 2/14W LED T8 Lamp & Low Pw r Ballast 6 $543 $198 $345 0.19 168 1,625 $196 1.8

26 N2 2/14W LED T8 Lamp & Low Pw r Ballast 9 $815 $296 $518 0.28 168 2,437 $294 1.8

27 P 1/14W LED T8 Lamp & Low Pw r Ballast 10 $654 $238 $416 0.16 60 499 $60 6.9

28 P1 2/14W LED T8 Lamp & Ballast 10 $905 $329 $576 0.27 60 842 $101 5.7

29 P2 2/14W LED T8 Lamp & Ballast 12 $1,086 $395 $691 0.32 60 1,011 $122 5.7

30 P3 2/12W LED T8 8' strip kit 2 $310 $113 $197 0.12 60 374 $45 4.4

31 P4 4/12W LED T8 8' strip kit 15 $3,042 $1,107 $1,935 1.65 60 5,148 $620 3.1

32 P5 4/12W LED T8 8' strip kit 63 $12,775 $4,649 $8,126 6.93 60 21,622 $2,604 3.1

33 P6 4/12W LED T8 8' strip kit 6 $1,217 $443 $774 0.66 60 2,059 $248 3.1

34 Q 36 WATT LED Special Fixture 35 $16,150 $5,877 $10,273 8.82 60 27,518 $3,314 3.1

35 Q1 36 WATT LED Special Fixture 24 $11,074 $4,030 $7,044 6.05 60 18,870 $2,273 3.1

36 R2 2/14W LED T8 Lamp & Ballast 3 $272 $99 $173 0.08 60 253 $30 5.7

37 R5 4/12W LED T8 8' reflector kit 5 $1,047 $381 $666 0.55 60 1,716 $207 3.2

38 U 13W LED BR30 Retrofit 4 $180 $66 $115 0.25 60 774 $93 1.2

39 U1 18W LED PAR38 36 degree Retrofit 14 $675 $246 $430 1.85 60 5,766 $694 0.6

40 W 30 WATT LED Special Fixture 52 $16,743 $6,093 $10,650 6.24 168 54,513 $6,566 1.6

41 X LED Exit Sign Retrofit 60 $2,744 $998 $1,745 1.08 168 9,435 $1,136 1.5

42 X1 LED Exit Sign Retrofit 36 $1,646 $599 $1,047 0.65 168 5,661 $682 1.5

43 Y 60 WATT LED Special Fixture 15 $7,090 $2,580 $4,510 2.22 168 19,394 $2,336 1.9

44 Y1 60 WATT LED Special Fixture 12 $5,672 $2,064 $3,608 1.78 168 15,515 $1,869 1.9

45 Z 40 WATT LED Canopy Fixture 2 $754 $275 $480 0.30 168 2,621 $316 1.5

46 G 8W LED A19 16 $546 $199 $347 1.07 60 3,345 $403 0.9

47 T 200 WATT LED Special Fixture 7 $1,208 $440 $768 1.79 60 5,569 $671 1.1

48 T1 200 WATT LED Special Fixture 5 $863 $314 $549 1.28 60 3,978 $479 1.1

49 V 15W A21 LED 126 $4,656 $1,694 $2,961 6.80 84 29,720 $3,580 0.8

$194,863 $70,914 $123,949 90.81 363,389 $43,768 2.8TOTALS:

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ECM # 1.07 – Retrofit Exterior Lighting Fixtures with LED – Whole Campus

Existing Conditions:

The existing exterior lighting fixtures are high intensity discharge (HID). They currently operate for approximately 12 hours a day via a time-clock.

Recommendations:

It is recommended the lamps be replaced with LED. The table below shows the recommended replacements.

ECM # 4.10 – Convert ACU’s 1 through 4 to Full DDC Actuation & Control and Optimize System

Existing Conditions:

HVAC equipment at the campus is controlled via a pneumatic control system. The system consists of a compressed air supply system, main line distribution system, branch lines, sensors, controllers, and actuators. The existing control system is antiquated and lacks the controllability found in modern day control systems. It is likely that many of the actuators controlling valves and/or dampers have failed and that sensors have drifted out of calibration.

Recommendations:

It is recommended to replace the existing pneumatic HVAC control system for ACUs 1 through 4 with a direct digital control (DDC) energy management system (EMS). A DDC system is capable of performing not only control but also energy management and system diagnostic functions in the environment of a centralized computer network. The DDC system receives input from remote sensors and devices, processes the data, and then controls remote mechanical equipment. DDC inherently has more accurate control because it reduces the drift, maintenance, and recalibration problems common with pneumatic control systems. This, combined with the reduction in the air compressors that power pneumatic control systems, yields significant energy savings.

The control strategies are as follows:

■ Reset discharge air for ACUs 5-8 from 55°F F to 60°F based on outside air temperature.

At 80°F OA the DA-T = 55°F, At 55°F OA the DA-T = 60°F, Ramp temperature linearly in between

■ Install Enthalpy Economizers on ACUs 1-8.

Installation Site Device Desciption QTY Total Cost Requested

Incentive

Net Cost of

Installation

Total KW

Saved

Estimated

Exist. Hrs./

Week

Annual kw h

Saved

Estimated

$ Saved

Simple

Payback

1 Front Parking Lot Floods 168 WATT LED Special Fixture 10 6,590$ 3,134$ 3,456$ 2.87 84 12,536$ 1,523$ 2.3

2 Front Parking Shoeboxes 168 WATT LED Special Fixture 4 2,636$ 1,153$ 1,483$ 1.06 84 4,630$ 562$ 2.6

3 Roadw ay Pole Lights 71 WATT LED Special Fixture 39 23,631$ 9,242$ 14,390$ 8.46 84 36,953$ 4,488$ 3.2

4 Ground Lights 50 WATT LED Special Fixture 77 34,391$ 6,559$ 27,832$ 6.01 84 26,252$ 3,188$ 8.7

5 Small Wallpacks 20 WATT LED Special Fixture 11 3,670$ 1,297$ 2,373$ 1.19 84 5,198$ 631$ 3.8

6 Vehicle Maintenance 92 WATT LED Special Fixture 3 1,729$ 642$ 1,087$ 0.59 84 2,577$ 313$ 3.5

7 Vehicle Maintenance 134 WATT LED Special Fixture 3 1,747$ 1,068$ 679$ 0.98 84 4,281$ 520$ 1.3

8 Receiving (Bay 11) 92 WATT LED Special Fixture 3 1,729$ 642$ 1,087$ 0.59 84 2,577$ 313$ 3.5

9 Receiving Pole Lights 168 WATT LED Special Fixture 2 1,318$ 627$ 691$ 0.57 84 2,490$ 302$ 2.3

10 Receiving Pole Lights 168 WATT LED Special Fixture 4 2,636$ 524$ 2,112$ 0.48 84 2,097$ 255$ 8.3

11 Pole Light Outside Receiving 168 WATT LED Special Fixture 1 659$ 131$ 528$ 0.12 84 524$ 64$ 8.3

12 Rec Yard Wallpacks 92 WATT LED Special Fixture 80 46,114$ 17,123$ 28,992$ 15.68 84 68,490$ 8,318$ 3.5

13 Front Entrance Bollards 26 WATT LED Special Fixture 9 6,144$ 1,002$ 5,141$ 0.92 84 4,019$ 488$ 10.5

14 Lift Lift Rental 1 1,652$ -$ 1,652$

15 Trash/Fixture Removal Material & Trash Handling 1 906$ -$ 906$

16 Check-In Procedures Check-In Procedures for REC 1 283$ -$ 283$

Pow er Source Abandon-HID-

Interior/Exterior 246 3,919$ -$ 3,919$

18 Relocate-HID-Interior/Exterior 246 5,515$ -$ 5,515$

145,271$ 43,144$ 102,127$ 39.52 172,623$ 20,965$ 4.9TOTALS:

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■ Implement Occupancy Schedules for ACU 7/8 (Refer to ECM 4.13 for additional information).

ECM # 4.13(a) – Integrate ACU-7 and ACU-8 Operation with Occupancy Schedule – Main Building

Existing Conditions:

ACU-7 and ACU-8 serve the visiting/dining and educational spaces respectively. These spaces are not occupied 24/7; however ACU-7 and ACU-8 are energized 24/7. The units are equipped with a hot water/glycol coil and a chilled water coil to maintain a discharge air temperature to the downstream VAV boxes. The supply and return fans control at variable volume based on static pressure readings and modulate outside air, return and exhaust dampers as needed to maintain minimum outside air requirements.

Supply Fan Schedule

Mark No

AREA

SERVED

LOCATION

FAN DATA

MO-

TOR

DATA

Cooling Coil Data Heating Coil Data

WATER Water

TO-

TAL

CFM

MIN

OA

HP GPM PD EWT °F GPM

P D

EWT °F

ACU-7

VISITING /

DINING

ROOF 11,100

2,10

15 75 10 45 26 5 180

ACU-8

EDUCA-

TIONAL

ROOF 10,000

1,70

15 68 10 45 24 5 180

Return Fan Schedule

MARK NO AREA SERVED LOCATION AIR VOLUME (CFM) MAX BHP

MOTOR DATA

HP VOLT PH

RF-7 ACU-7 ROOF 9,000 4.5 7.50 480 3

RF-8 ACU-8 ROOF 8,300 4 5.00 480 3

It is recommended to align the operation of ACU-7 and ACU-8 based on actual occupancy of the spaces they serve.

The proposed schedule for the ACUs is 7AM – 6PM, Monday – Friday. By reducing the overall hours of operation for each of the units, electricity savings through fan energy, pump energy, chilled water consumption as well as natural gas savings through hot water consumption can be seen.

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ECM # 4.13(b) – Integrate HV-2 Operation with Occupancy Schedule – Main Building

Existing Conditions:

HV-2 is a 100% outside air heating and ventilation unit serving the kitchen. The intent of the unit is to operate to provide makeup air and ventilation to the kitchen spaces when the kitchen is in use. Based on discussions on site, the HV-2 is operating 24/7 regardless of the operation of the kitchen.

Supply Fan Schedule

Mark No

AREA SERVED LOCATION

FAN DATA

MO-

TOR

DATA

Cooling Coil Data Heating Coil Data

WATER Water

TO-

TAL

CFM

MIN

OA

HP GPM PD EWT °F GPM PD EWT °F

HV-2

KITCHEN /

MAKE-UP

ROOF 3,250 3,250 3 NA NA NA 26 5 180

It is recommended to align the operation of HV-2 based on actual occupancy of the kitchen. The proposed schedule for HV-2 is 3AM – 7PM. By reducing the overall hours of operation for the unit, electricity savings through fan and pump energy as well as natural gas savings through hot water consumption can be seen.

ECM # 4.14(a) – Integrate Dishwasher Exhaust Fan with Dishwasher Operation – Main Building

Existing Conditions:

The dishwasher exhaust fan (KX-3) is manually controlled via a switch. However, as per discussions with the facilities team, the dishwasher fan does not de-energize when the switch is “off”. As a result, KX-3 is energized 24/7. It is likely that the fan and switch have to be re-wired for proper control.

Exhaust Fan Schedule

MARK NO AREA SERVED LOCATION AIR VOLUME (CFM) MAX BHP

MOTOR DATA

HP VOLT PH

KX-3 DISHWASHER ROOF 600 - 0.33 120 1

It is recommended to inspect the wiring of the exhaust fan and switch. The exhaust fan should only be energized when the switch is turned “on” by the occupant.

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ECM # 4.14(b) – Integrate Laundry Exhaust Fan LX-1 and Heating Ventilation Unit HV-3 with Occupancy Schedule – Main Building

Existing Conditions:

HV-3 and the laundry exhaust fan are energized 24/7. HV-3 provides heating and ventilation to the laundry room.

The laundry exhaust fan exhausts air from the laundry room.

Supply Fan Schedule

Mark No

AREA SERVED LOCATION

FAN DATA

MO-

TOR

DATA

Cooling Coil Data Heating Coil Data

WATER Water

TO-

TAL

CFM

MIN

OA

HP GPM PD EWT °F GPM PD EWT °F

HV-3

KITCHEN /

LAUNDRY

ROOF 2,100 500 3 NA NA NA 18 5 180

It is recommended to align the operation of HV-3 and the laundry exhaust fan based on actual occupancy of the laundry room. The occupancy schedule can be set via a time-clock connected to the HV-3 and laundry exhaust fan power distribution panel. The proposed schedule is to be determined by NCCC. By reducing the overall hours of operation for the units, electricity savings can be achieved.

ECM # 4.14(c) – Install Demand Controlled Ventilation/Exhaust Controls for Kitchen Exhaust Fan KX-1 and Heating Ventilation Unit HV-1 – Main Building

Existing Conditions:

HV-1 is an 11,200 CFM unit that provides ventilation and heating to the kitchen. KX-1 exhausts 11,900 CFM from the kitchen exhaust hoods. Currently, HV-1 is energized 24/7 and KX-1 is energized via a manual switch. The intent of HV-1 is to operate to provide makeup air and ventilation to the kitchen when the kitchen is in use.

Mark No

AREA SERVED LOCATION

FAN DATA

MO-

TOR

DATA

Cooling Coil Data Heating Coil Data

WATER Water

TO-

TAL

CFM

MIN

OA

HP GPM PD EWT °F GPM PD EWT °F

HV-1

KITCHEN /

MAKE-UP

ROOF 11,200 1,200 10 NA NA NA 95 5 180

MARK NO AREA SERVED LOCATION AIR VOLUME (CFM) MAX BHP

MOTOR DATA

HP VOLT PH

KX-1 KITCHEN HOOD ROOF 11,900 - 7.50 480 3

It is recommended to install a demand controlled ventilation/exhaust system. The system controls utilize optical and temperature sensors to measure smoke, steam, and temperature variances caused by cooking activity in a kitchen hood, and adjusts the fan speed to slow down both exhaust (KX-1) and make-up air (HV-1) via a variable frequency drive (VFD). The HV-1 supply fan motor and the KX-1 exhaust fan motor will need to be replaced to ensure compatibility with the VFD. The controls allow for a 50-70% reduction in fan speeds.

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ECM # 5.02(a) – Install Low Flow / Ultra Low Flow Fixtures for Water Closets, Faucets, Urinals, and Showerheads serving Admin/Staff Areas – Whole Campus

Existing Conditions:

The campus consists of various general use flow fixtures including toilets, urinals, lavatories, kitchen sinks, and showers. It was noted that the majority of these fixtures are standard flow with the exception of waterless urinals in the visiting areas.

There are currently 36 staff water closets, 37 faucets, 12 showers, and 11 urinals.

Recommendations:

It is recommended to convert all existing staff standard flow fixtures to low-flow or ultra-low-flow fixtures. The following table summarizes the different between standard flow, low flow, and ultra-flow fixtures.

Fixture Standard Flow Low-Flow Ultra Low-Flow Existing Quantity

Water Closet 1.6 (gal/flush) 1.1 (gal/flush) 0.8 (gal/flush) 36

Urinal 1.0 (gal/flush) 0.5 (gal/flush) N/A 11

Faucet 2.5 (gal/min) 1.8 (gal/min) 0.5 (gal/min) 37

Shower 2.5 (gal/min) 1.8 (gal/min) N/A 12

ECM # 5.02(b) – Install a Computerized Water Conservation System for the Combi-Units and Showers serving Inmates. Replace Inmate Showerheads with new, Low-Flow Showerheads

Existing Conditions:

The facility consumes nearly 25 million gallons of water each year. As per discussions with the site team, there is a tendency for inmates to use the combie units (combined inmate sink and toilet fixture) as a means for garbage disposal. Consequently, the toilets are flushed unnecessarily, resulting in increased water use. It is estimated that there are 200 combie units on site and each unit is flushed 20 times per day. The existing combie units are 3.5 gallons per flush (gpf).

It is estimated that there are 54 showers serving the inmates. These showers are equipped with standard flow, 2.5 gallons per minute (gpm) shower heads.

Recommendations:

It is recommended to retrofit the existing combie units with an I-Con system (or equivalent). This system consists of an electronic controller, flush valve, and solenoid connector which function to (1) limit the number of flushes per day and (2) reduce the gpf to 1.6. To calculate energy savings, it was assumed that each of the combie units are allowed 10 flushes per day.

It is also recommended to replace the existing standard flow (2.5 pgm) shower heads serving the inmates with low-flow shower heads rated at 1.8 pgm. Furthermore, it is recommended to install an I-Con system (or equivalent) on the showers to limit the shower run-time per day. To calculate energy savings, it was assumed that the average shower run time is reduced from 10 minutes/shower/inmate to 7 minutes/shower/inmate.

ECM # 7.01 – Ozone Laundry System – Main Building

Existing Conditions:

There are five (5) commercial laundry machines in the main building. Each laundry machine operates about 16 hours a day and consumes significant domestic hot water year round.

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It is recommended to replace the existing laundry machines with an Ozone Laundry System. The system reduces laundry hot water consumption by approximately 75%, therefore reducing the load on the domestic hot water boilers serving the laundry machines. Moreover, the system reduces the cycle run-time, reduces potable water consumption, and increases the life of linens.

ECM # 9.00 – Convert Multizone Units ACU-1 through ACU-4 to Variable Volume Units – Main Building

Existing Conditions:

Within the main building there are four (4) main pods of holding cells. Each pod is served by one (1) penthouse air conditioning unit (ACU-1 through ACU-4) with heating and cooling. The mechanical room that houses each ACU acts as a mixing box of return air and outside air. A return fan (RF) operates in tandem with the ACU supply fan to recirculate/exhaust air as dictated by the orientation of the unit dampers. The units operate 24/7 as hot deck / cold deck units with cold deck operation in the summer and hot deck operation in the winter. A hot water coil and chilled water coil within the unit operate to maintain return air temperature coming back from the pod. The supply and return fans control at constant volume and modulate outside air, return, and exhaust dampers as needed to maintain the minimum outside air requirements.

Recommendations:

It is recommended to replace the existing supply and return fan motors for ACU-1 through ACU-4 with high efficiency motors equipped with VFDs. This measure assumes the ACUs have already been converted from pneumatic to DDC as part of an existing controls project scheduled to be completed in September 2016. Additionally, it is recommended to install three (3) temperature sensors in each of the pods to monitor space temperature.

The temperature sensors will report back to the building management system, which will calculate the average or worst case temperature of all 3 sensors. The VFDs will then modulate the ACU supply fan speed as needed to maintain the space temperature setpoint of 70°F (adj) during heating season and 75°F (adj) during cooling season.

When the space temperature is satisfied, the ACU supply will operate at minimum speed to only provide the minimum required ventilation air per the applicable code. This will result in significant fan energy savings.

ECM # 9.01 – Install VFD’s on Secondary HW Glycol Pumps P-3A & P-3B and Convert the Existing HW Boiler System to DDC and Connect to the new EMS – Main Building

Existing Conditions:

Secondary Glycol Pumps (P-3A, P-3B)

The secondary glycol pumps operate to maintain glycol water flow through the ACUs and HVs. The pumps control to provide glycol hot water to the ACUs and HVs whenever the units are calling for heat. The pumps are constant volume and control on a lead/standby basis. The pumps are original to the building.

MARK NO SERVICE LOCATION PUMP TYPE

PERFORMANCE DATA MOTOR DATA

GPM TDH (FT) RPM HP VOLT PHASE

P3-(A&B) GLYCOL BOILER ROOM END SUCTION 540 70 1750 15 480 3

The figure below shows the hot water glycol flow diagram per drawing H-14 of the construction document set.

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Figure 5.1 - Hot Water Glycol Loop Flow Diagram

It is recommended to replace the pump motors with high efficiency motors equipped with VFDs. The VFDs should operate to maintain a differential pressure 2/3 of the way downstream of the respective loop. This measure will allow the pumps to operate down to minimum speeds during off seasons when minimal heating is needed. In addition to installing VFDs on the pumps, the hot water loop will need to be balanced in order to provide proper differential pressure.

A bypass valve along with the associated piping should be installed within in the boiler plant on the glycol loop. If only one pump is running, it is at minimum speed, and the hot water differential pressure is above setpoint, the bypass valve will be controlled to maintain the hot water differential pressure at setpoint. While the bypass valve is under control, the pump speed will remain at minimum. If the bypass valve is fully closed and the hot water differential pressure is below setpoint, pump speed control and staging will be enabled while the bypass valve remains fully closed.

Additionally, it is recommended the hot water system be upgraded from pneumatic to DDC. This will require a front end system to control/monitor all aspects of the hot water plant, including the hot water boilers, (2) primary HW pumps, and (4) secondary hot water pumps. The installation costs include both the VFD retrofit on the glycol pumps and the pneumatic to DDC conversion for the hot water system.

ECM # 16.00 – Install Cogeneration System for Domestic Hot Water – Main Building

Existing Conditions:

There are six (6) domestic hot water heaters serving three (3) domestic hot water (DHW) systems, which each operate year-round:

Main DHW System – serves sinks and showers

The main domestic hot water…