Attachment 5 Calculations.pdf

National Agricultural Library Cooling

Tower Replacement

National Agricultural Library (NAL)

Beltsville, MD

CALCULATIONS

11 July 2024

Contract Number: 12305B21D0016

Order Number: 1232SA22F0197

Our Ref: 212.007 7900 Westpark Dr., Suite A405

McLean, VA 22102

JOB NAL Cooling Tower Replacement 212.007

SHEET NO. 1 OF 2

CALCULATED BY LB DATE

CHECKED BY DATE

SCALE

TABLE OF CONENTS

SECTION DESCRIPTION

1.0 Design Narrative – Mechanical

2.0 Design Narrative – Structural

MECHANICAL CALCULATIONS

1. Design Conditions and Constraints

1.0 Criteria Review

1.1 Seismic Analysis

2.0 Existing Chilled Water Plant

2.1 (E)CH-1 & 2

2.2 (E) CT Filtration 2.2a (E)CT Filtration Pump

2.4 (E)Condenser Water Pumps

2.5 (E)Condenser Water Pump Motors

2.6 (E)CHP1D & CWP2D Free Cool

3.0 Cooling Towers

3.1 BAC Tower Performance

3.2 BAC Drawings

3.3 SPX Cooling Tech, LLC Tower Performance

3.4 SPX Engineering Data

4.0 Pumps

4.1 Condenser Piping Pressure Drop

4.2 Pump Selection

5.0 Rental Cooling Tower

5.1 Rental Cutsheet

6.0 Miscellaneous

6.1 Heat Trace

6.2 Spring Isolators

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ELECTICAL CALCULATIONS

SECTION DESCRIPTION

1.0 Design criteria

2.0 Panel schedules

STRUCTURAL CALCULATIONS

National Agricultural Library Cooling Tower Replacement | Order No. 1232SA22F0197 National Agricultural Library | Beltsville, MD

Summer Consultants, Inc. 1-1

CHAPTER 1

DESIGN NARRATIVE - MECHANICAL

1. Scope of work: The cooling towers at the National Agricultural Library have reached the end of their useful life and require replacement. The scope of work includes the following items:

a. Replacing the existing two cell cooling tower with a cooling tower of the same capacity and number of cells.

b. Provide isolation valves for maintenance and shutdown. Integrate controls and isolation valves.

c. Provide temporary cooling for the building during the tower replacement.

d. Coordinate detailed outage parameters for systems related to the scope. NAL can only experience limited outages.

e. Analyze the cooling tower structural support and replace as necessary.

f. Provide variable frequency drives (VFDs) for the cooling tower fans.

g. Integrate cooling towers into existing controls and BAS.

2. The National Agricultural Library (NAL) building officially opened in 1969 as the third national library in the United States. The library is comprised of two buildings: the tower and annex. The seventeen-story tower contains mechanical spaces in the basement and penthouse, equipment and staff rooms on the ground floor, lobby and reading area on the first floor, office spaces on floors two through four, book stacks on floors five through thirteen, a conference area on fourteenth floor, and the mechanical penthouse on the fifteenth floor. The annex wing includes a basement, ground, and first floor.

3. Chilled water plant

a. The chiller plant is located on the basement floor of the tower building and the cooling towers are located on the roof of the tower.

b. The system is a variable primary chilled water system with two, 400-ton chillers.

The chillers were replaced in 2005.

c. The existing two-cell cooling towers were installed in 1998. Each cell is rated for nominal 400 tons (roughly 500 tons of heat rejection). Towers are at the end of their life and are being replaced.

d. Chilled water temperatures are 52°F entering and 42°F leaving.

e. There is a 200-ton plate and frame heat exchanger for water-side free-cooling.

f. Operation is required year-round.

4. Replace (2) Nominal 400-ton cooling towers on the roof.

Summer Consultants, Inc. 1-2

a. Summer Consultants investigated relocating the cooling towers to grade to remove a water source on roof over the library stacks. A letter sent to USDA, dated 7 December 2022, identified design benefits and drawbacks to have the cooling towers on grade versus on the roof (the existing location)

i. USDA/NAL decided to keep the cooling towers located on the roof for reasons of noise and historical impacts.

5. Tower Condenser Water Flow

a. The building is presently configured with constant speed condenser water pumps at 3 gpm/ton. Current best practice is to reduce pump energy by increasing the tower delta T (difference between entering and leaving water temperatures) and selecting the systems for 2 gpm per ton with a corresponding 15°F temperature difference. This reduces pump energy for the condenser water and reduces the size of the cooling towers.

b. The ambient wet bulb conditions for Beltsville, MD is 78°F Wb, and we are limited to a 5°F approach to achieve CTI certification. The CTI certified operating range can be 95°F to 83°F at 78°F Wb ambient wet bulb. This results in a design temperature difference of 12°F resulting in a 1,000 gpm flow per cell.

c. The proposed controls and condenser water flow will reduce pump energy, maximizing the use of cooling tower fill and cooling tower fan operation.

d. The existing pumps are not appropriately sized for the existing or proposed flow on the cooling tower. The pumps will need to be replaced run most efficiently.

6. Cooling tower selections and accessories

a. (2) Nominal 400-ton cooling towers each with 2 fans. The fans for each tower will be served by a single motor and VFD.

b. The tower will be Factory Mutual approved, national organization specializing in certification of property loss prevention product, which provides greater protection to the equipment.

c. To protect against corrosion, the tower basins will be stainless steel. The rest of the tower components are galvanized steel. Each basin will have electric basin heaters for freeze protection.

d. The tower will have access platforms and ladders to access the top of the tower and the tower basins. The access platform will meet OSHA requirements.

e. Condenser water side filtration for basin sweepers.

7. Vibration isolation

a. The cooling towers are located above conference space on the 14th floor. To prevent structure born noise from entering the occupied spaces and points for leaking, the cooling towers need vibration isolation for the cells and piping.

b. Flexible connections, while essential for the operation of the cooling tower, can be a weak point in the piping system as they allow for movement. Reducing the quantity of flexible connections reduces the amount of potential leaking points.

Summer Consultants, Inc. 1-3

c. The flexible connections allow the cooling tower cells to shift with the motor vibration and the varied water level in the basins. The flexible connection allows for vertical height change, reducing the strain on piping connections to the towers and the piping systems. Without them, leaking would occur at the connection points to the tower and piping.

d. The design includes supporting all the cooling tower cell to a common, floating structural frame. All the cooling tower cells will shift up and down as one unit. As all cells move together, flexible connections on piping between the cooling tower cells is not required. Additionally, we can mount the piping to the floating frame, eliminating additional flexible connections.

8. Temporary cooling tower

a. Rental cooling tower is required while the towers on the roof are being replaced to maintain cooling.

b. To reduce rental cost and temporary condition cost, the construction will be limited to October to March to provide a temporary cooling tower for one chiller. Only during peak summer months is the second chiller turned on.

c. Size temporary towers at nominal for 400 tons to provide heat rejection for one 400-ton chiller.

d. For the pumps serving the towers, either the existing or new pumps can serve the temporary towers.

9. Phasing

a. Cooling tower lead times are about 6 months.

b. Cooling tower shutdown can only be from October 1st to March 1st during the year. The cooling towers must be operational during the cooling season.

Temporary cooling towers must be provided during the tower replacement. The temporary tower is sized at 500 tons to meet the partial load out of the peak summer months.

c. Outages

i. Electrical outages - 3 hours max per motor control center (MCC).

Shutdowns will be required for the temporary cooling tower connection/removal, and cooling tower motor connections.

ii. MCC-6 will require one shutdown to connect the temporary cooling tower. The condenser water pumps are using the

1. MCC 6-CH Located in the basement mechanical room.

a. Condenser water pumps 1, 2, 3

b. Temporary cooling towers

iii. MCC-5A will require 2 shutdowns to demolish existing towers connections and connect new VFDs. See affected equipment below

1. MCC 5A – located in penthouse.

a. P-1

Summer Consultants, Inc. 1-4

b. PF-2, PF-2

c. VFD-1, VFD-2, VFD-3

d. HUM-1

iv. Mechanical outages 8-hour max for chiller plant outage:

1. outage on chilled water plant for temporary piping connections and temporary cooling tower.

F:\PROJECTS\19\191 NAVFAC Wash MEP\191.041 WRNMMC B62 Study\Covers\ch 2.docx Document1

Summer Consultants, Inc. 2-1

CHAPTER 2

DESIGN NARRATIVE - STRUCTURAL

1. Applicable Code and Criteria

.1 IBC 2021 International Building Code, 2021

.2 IEBC 2021 International Existing Building Code, 2021

.3 ASCE 7-16 Minimum Design Loads and Associated Criteria for Buildings and Other Structures, 2016, with Supplement 1

.4 ACI 318-19 Building Code Requirements for Reinforced Concrete, 2019

.5 AISC 360-16 Specification for Structural Steel Buildings, 2016

2. Existing Conditions

.1 The existing structure is tee-shaped in plan with a Tower that extends 15-stories above grade and a Wing that extends 2-stories above grade. There is a 1-story below-grade basement level beneath the Tower and an unfinished area beneath the Wing. The tower has a large u-shaped mechanical Penthouse which extends above the main Roof. The overall footprint of the tower structure is approximately 121 feet by 133 feet.

.2 The building consists of a cast-in-place reinforced concrete frame. The following description of the existing structure is based on the existing structural drawings. The Tower floor framing typically consists of 15 1/2" thick waffle slabs (3 1/2" slabs with 12” deep ribs) supported on reinforced concrete columns. The Tower Ground Floor, Roof, and Penthouse Roof framing consist of two-way slabs with beams, with 8 to 9 ½” thick slabs at the Ground Floor and 7” thick slabs at the Roof and Penthouse Roof. The Tower is supported on a 4’-6” mat foundation while the Wing is supported on shallow spread and strip footings.

.3 Structural drawings for the original building were prepared by Severud-Perrone-Fischer- Sturm-Conlin-Bandel Structural Engineers and dated 3 January 1966. The following design criteria and material are identified:

a. Concrete Compressive Strength: 3,000 PSI (Typical) *

4,000 PSI (Tower Columns)

* framed slab and stair construction utilized lightweight aggregate concrete

b. Reinforcing Steel Yield Strength: 60,000 PSI (Typical)

75,000 psi (#14 and #18 bars)

c. Live Load: 30 PSF (Roofs)

150 PSF (Mech. Penthouse)

.4 The existing Cooling Tower is supported on elevated steel dunnage framing. The framing is heavily corroded, with section loss from both flanges and webs. The top flanges are pitted, where standing water has eroded the top surface. There are places where holes extend completely through the beam webs.

Summer Consultants, Inc. 2-2

3. New Work

.1 The Cooling Tower will be removed and replaced with a similar 2-Cell unit.

.2 The structural steel framing will be removed and replaced with new hot-dip galvanized steel framing. The new Cooling Tower will be mounted to a steel frame that is elevated above the primary steel dunnage framing with vibration isolators.

.3 Although the new Cooling Tower weighs more than the existing Cooling Tower, the existing Cooling Tower is not the original. The new Cooling Tower weighs less than the original Cooling Tower and is, therefore, structurally acceptable.

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MECHANICAL CALCULATIONS

CALCULATED BY LB DATE 27 Feb. 2023

SECTION 1

DESIGN CONDITIONS AND CONSTRAINTS

CALCULATED BY LB DATE Feb 2023

CODE REVIEW

1. Agricultural Research Service (ARS)

a. IBC – (most current)

b. NFPA – 101

c. The term “Recommended” as used in the ASHRAE Standards shall be considered “Required” for:

i. ASHRAE: Handbook of Fundamentals

ii. ASHRAE: Handbook of HVAC Applications

iii. ASHRAE: Handbook of HVAC Systems and Equipment

iv. ASHRAE: Standard 62.1: Ventilation for Acceptable Indoor Air Quality

v. ASHRAE: Standard 90.1: Energy Standard for Buildings Except Low-Rise Residential Buildings

vi. ASHRAE: Guideline 12: Minimizing the Risk of Legionellosis Associated with Building Water Systems

d. National Fire Protection Association: National Fire Codes

e. ADA

f. 5.16 Access to machines and equipment

i. Access to elevated major equipment (such as AHU’s, cooling towers, chillers, and boilers) must be by stairs, not by ladders.

ii. Use: This is met with existing conditions.

g. 5.4.1 B: OA Winter design conditions based on 99 percent dry bulb temp. Cooling towers shall be selected based on the one percent wet-bulb temperature.

i. 99% - 17.5°F Heating

ii. 1% WB - 76.7°F wb, 86.4°F MCDB

1. 0.4% - 78.0°F wb, 88.8°F MCDB

h. General Office Space and Laboratories Cooling 76°F DB and 50% RH Heating 70°F DB and a minimum of 30% RH.

i. 5.4.3 HVAC Design Coordination

i. D: Cooling Tower Location: Tower shall be located so as to be least obvious and, if possible, at ground level. Discharge at low levels, or where it may come in contact with buildings or fresh air intakes, shall be avoided.

CALCULATED BY LB DATE Feb 2023

ii. Seismic Considerations. If sites are subject to earthquakes, design of equipment especially outdoor cooling towers and water tanks, piping systems, ductwork, and foundations, shall include suitable allowance for horizontal forces. Equipment and piping shall be seismically braced.

j. 5.4.6: Cooling towers shall be equipped with water meters where sewer charges may be avoided on makeup water.

k. 5.4.9 D: Cooling Towers

i. Provide mechanically induced draft cooling towers having a separate cell for each refrigerating machine. Each cell shall have a separate basin. Height of supports should permit easy maintenance and painting of basin and support structure. Outlet connections must be accessible for repairs. Variable frequency drives on cooling towers should be provided for energy conservation.

ii. Size towers for heat rejection of system served with a 10℉ water temperature rise and approximately 8℉ approach to entering wet bulb temperature. Design architectural enclosures and structural supports to accommodate both cross flow and counter flow towers having any standard post spacing. Enclosures should not restrict air flow to tower or permit recirculating of fan discharge air.

iii. Consider a three way valve configuration to provide constant condenser water temperature return to the chiller. Controls and programming for lowering condenser water temperatures on low load days should be considered for better chiller efficiency.

l. Appendix 5C: Energy Saving Design

i. Condenser water reset

ii. Variable speed drives on cooling tower fans (to be used in conjunction with condenser water reset). Reference ASHRAE 90.1, Paragraph 6.5.5.2.

iii. Waterside economizers – use of cooling tower water in a heat exchanger or directly as chilled water during cold weather. Reference ASHRAE 90.1, Paragraph 6.5.1.2. - Fluid economizers

1. 90.1: Fluid economizer systems shall be capable of providing up to 100% of the expected system cooling load at outdoor temperatures of 50°F db./45°F wb.

iv. Optimize chiller plant operation – both chillers and cooling tower. Weigh cycling cooling tower fans vs. lowering condenser water temperature to chiller. Sequence chillers to maximize part load efficiencies.

CALCULATED BY LB DATE Feb 2023

2. ASHRAE: Guideline 12: Minimizing the Risk of Legionellosis Associated with Building Water Systems

a. 7.1.2.2 Circulating Water System – avoid dead legs in the piping design

3. ASHRAE 90.1-2019: ENERGY STANDARD FOR BUILDINGS EXCEPT LOW-RISE RESIDENTIAL

BUILDINGS

a. Per Section 6.4.1.1, fan equipment shown in Table 6.8.1-7 shall have a minimum performance of ≥40.2GPM/HP.

b. Per Section 6.4.4.1.3, new and replacement piping shall be thermally insulated in accordance with Table 6.8.3-1 and 2.

c. Para. 6.4.3.11 Chilled-water plant monitoring – required for electric motor driven water cooled plants in existing buildings with larger than 1000 tons of peak cooling capacity: measure electric usage and efficiency of the plant. The efficiency shall be calculated in kW/ton of cooling operating capacity.

d. Beltsville Maryland is zone 4A per Table Annex 1-1 ASHRAE Standard 169-2013: US Climate Zones by State and County.

4. Guiding Principles for Sustainable Federal Buildings December 2020

a. 2.1. Energy Efficiency: Comply with all relevant statutory and regulatory requirements that establish Federal building energy efficiency standards and require the purchase, installation, and use of energy efficient products and/or equipment.

Employ strategies that continue to optimize energy performance and minimize energy use throughout the operation and life of the building.

b. 6.5.5.2.1: The fan system on a heat-rejection device powered by an individual motor or an array of motors with a connected power, including the motor service factor, totaling 5 hp or more shall have control and/or devices (such as variable-speed control) that shall result in fan motor demand of no more than 30% of design wattages at 50% of the design airflow and that shall automatically modulate the fan speed to control the leaving fluid temperature or condensing temperature/pressure of the heat-rejection device.

c. 6.5.5.2.2: Multicell heat-rejection equipment with variable drives shall

i. Operate the maximum number of fans allowed that comply with manufacturer’s requirements for all system components and

ii. Control all fans to the same fan speed required for the instantaneous cooling duty, as opposed to staged (on/off) operation. Minimum fan speed shall comply with the minimum allowable speed of the fan drive system per the manufacture’s recommendation.

5. 2021 INTERNATIONAL MECHANICAL CODE (IMC)

CALCULATED BY LB DATE Feb 2023

a. 301.18: Mechanical system supports shall be designed and installed for seismic forces in accordance with the IBC when earthquake loads are applicable (by the IBC).

b. 305.4: Piping shall be supported at distances not exceeding the spacing specified in Table 305.4 or in accordance with MSS SP-69.

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SEISMIC ANALYSIS

1. Purpose

.1 Determine the seismic restraint requirements of the non-structural architectural, mechanical, and electrical components.

2. Data

.1 INTERNATIONAL BUILDING CODE 2021 (IBC)

a. Section 1613 – Earthquake Loads

.2 ASCE 7 2010: AMERICAN SOCIETY FOR CIVIL ENGINEERS – MINIMUM DESIGN LOADS

FOR BUILDINGS AND OTHER STRUCTURES

a. Chapter 11 – Seismic Design Criteria

b. Chapter 13 – Seismic Design Requirements for Nonstructural Components

3. Analysis

.1 Determine Risk Category. (UFC)

• From IBC Table 1604.5 this facility will be categorized using a Risk Category of II since it does not fall directly into any category and structures do not represent a substantial hazard to human life.

Risk Category = II

.2 Determination of Seismic Design Category (The following 4 steps are needed and go into the calculation of the SDC)

a. Determine Spectral Response Acceleration at short periods(0.2s), SS, and long periods(1.0s), S1.

b. From IBC Figure 1613.3.1:

c. From USGS Web App 2/27/2023 https://asce7hazardtool.online/

SS = 0.15g

S1 = 0.041g

d. Determine Site Soil Class.

• If soil properties are not known then Site Class D will be used. (IBC 1613.3.2)

Site Class: D

e. Determine Site Coefficients

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CALCULATED BY DATE

• From IBC Table 1613.3.3(1) using Site Class D and an SS= 0.15 which results in an SS ≤ 0.25

Fa = 1.6

• From IBC Table 1613.3.3(2) using Site Class D and an S1 = 0.04 which results in an SS ≤ 0.1

Fv = 2.4

f. Determine Design Spectral Response Acceleration at short periods(0.2s), SDS, and long periods(1.0s), SD1.

• From IBC Equations 16-37 and 16-38.

SMS = (Fa)(SS)

SMS = (1.60)(0.15) = SMS = 0.24g

SM1 = (Fv)(S1)

SM1 = (2.40)(0.04) = SM1 = 0.10g

• From IBC Equations 16-39 and 16-40.

SDS = (2/3)SMS

SDS = (2/3)(0.24) = SDS = 0.16g

SD1 = (2/3)SM1

SD1 = (2/3)(0.1) = SD1 = 0.07g

g. Determine Seismic Design Category based on short-period and long-period Response Accelerations.

• From IBC Table 1613.3.5(1) using SDS < 0.167g and a Risk Category of II

SDC = A

• From IBC Table 1613.3.5(2) using 0.067g ≤ SD1 ≤ 0.133g and a Risk Category of II

SDC = A

Therefore: SDC = A

.3 Seismic Design Requirements

a. (EXEMPTION 1)Since the Seismic Design Category is A, no seismic restraints are necessary for nonstructural components per ASCE Chapter 11.7.

F:\PROJECTS\21\212 USDA NE AE Services\212.007 BARC Nat Ag Library Towers\Calcs\Mech\212.007 M-1.1 IBC Seismic Analysis.docx

CALCULATED BY LB DATE 27 Feb. 2023

SECTION 2

EXISTING CHILLED WATER PLANT

CALCULATED BY LB DATE

EXISTING CHILLED WATER PLANT

1. Existing Plant

a. The chiller plant is located on the basement floor of the tower building.

b. Cooling towers are located on the roof of the tower.

c. The system is a variable primary chilled water system with two, 400-ton chillers.

Operation is required year-round.

i. The chillers were replaced in 2005.

ii. Chilled water temperatures are 52°F entering and 42°F leaving.

iii. Model: YORK YKCFCGP5-CMF

iv. The minimum condenser flow rate on these chillers is 549 GPM. Max is 1796

GPM.

d. The existing two-cell, nominal-ton cooling towers were installed in 1998. Each cell is rated for nominal 400 tons (roughly 500 tons of heat rejection). Towers are at the end of their lifecycle and are being replaced.

i. Cooling Tower CT-1: The BAC Model 15425-2dr cooling tower is a two cell induced draft crossflow tower rated to cool 2,400 gpm (1,200 gpm each cell) entering at 95°F and leaving at 85°F with 78°F ambient wet-bulb temperature.

ii. Units are hot-dipped galvanized steel with corrosion protection.

iii. Electric basin heaters sized to maintain 40°F at 0°F ambient.

iv. There is no vibration isolation on the cooling tower or piping.

v. There is a Filtration skid located inside of penthouse serving the towers.

1. G&L series SSH: Model # 4SH2K55B0

2. 7.5 hp motor – 460/3ph/60hz

3. Lakos - ILB-0250, SEPARATOR

a. Capable of 95-155 gpm of flow.

vi. The towers are on existing dunnage from column bays: 8-7 and J-G. The existing dunnage is not reusable and is to be replaced.

vii. Water treatment is maintained through their maintenance contractor: BOND

WATER TECHNOLOGIES, INC.

CALCULATED BY LB DATE

e. Condenser water pumps

i. The condenser water pumps are located on the basement floor of the tower building.

ii. The existing condensing water pumps have a pressure drop rating of 143 feet of head with a flow rate of 1200 GPM.

iii. Existing motor size is 75 HP.

iv. Condenser Water Pump #1 serves Chiller #1.

Condenser Water Pump #2 is a standby pump.

Condenser Water Pump #3 serves Chiller #2.

f. 200-ton plate and frame heat exchanger for water-side free-cooling.

i. The free cooling pumps, CHP1D and CWP2D are in the basement floor of the tower building each serving the heat exchanger. The system serves the cooling load of the building during the winter season. This free cooling condenser pumps circulates through a cooling tower to take advantage of the cold ambient outdoor conditions.

ii. Heat exchanger – Ameridex Plate exchangers

1. Serial # 964198

iii. CHP1D is the free cooling chilled water pump. It is rated for pressure drop of 100 feet of head and flow rate of 400 GPM.

iv. CWP2D is the free cooling, condenser water pump. It is rated for a pressure drop of 170 feet of head and flow rate of 450 GPM.

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Chillers AppData

Contract Number

05113801 Order Number

1 Service District Number

Model Number

YKCFCGP5-CMF Serial Number

SFPM844200

Service Department Number

Job Name NATIONAL AGRICULTURAL L Job Location

BELTSVILLE, MD Manufacturing Site

SAT

Production Date

20050613 Ship Date

20050613

Ship To Name

WO GRUBB Ship to City

BALTIMORE Ship to State MD

Sold To Name

YORK INTL WASHINGTON 1634 Sold to City

COLUMBIA Sold to State MD

Gear Code WV Volts 460 FLA 352.00 Oil Pump Voltage

Oil Pump

FLA

3.60

Capacity 400.00 Phase 3 LRA 2598.00 KW 243.00 HP 307.00

Refrigerant R-134A Freq. 60 IRA 362.00 Starter Type

VARIABLE SPEED Hot Gas

NOT LISTED

Evaporator

Evap EWT 52.00

Evap LWT 42.00

Evap Flow 960.00

Evap PD 10.60

Evap Fluid Type WATER

Evap Number of Passes

Evap FF 0.00010

Evap DWP 150

Evap Nozzle In C

Evap Nozzle Out B

Condenser

Cond EWT 85.00

Cond LWT 94.33

Cond Flow 1200.00

Cond PD 8.80

Cond Fluid Type WATER

Cond Number of Passes

Cond FF 0.00025

Cond DWP 150

Cond Nozzle In R

Cond Nozzle Out

S

Absorber Specific

HW EWT 0.00

HW LWT 0.00

HW Flow 0.00

HW PD 0.00

HW Fluid Type HW Number of Passes

HW FF 0.00000

HW DWP 0

HW Nozzle

HW Pressure 0.00

HW Steam Flow

0.00 benzel Typewritten Text

The minimum condenser flow rate on these chillers would be 549 GPM. Max is 1796 GPM.

benzel Typewritten Text

CH-1

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Chillers AppData

Contract Number

05113801 Order Number

1 Service District Number

Model Number

YKCFCGP5-CMF Serial Number

SFPM844070

Service Department Number

Job Name NATIONAL AGRICULTURAL L Job Location

BELTSVILLE, MD Manufacturing Site

SAT

Production Date

20050613 Ship Date

20050613

Ship To Name

WO GRUBB Ship to City

BALTIMORE Ship to State MD

Sold To Name

YORK INTL WASHINGTON 1634 Sold to City

COLUMBIA Sold to State MD

Gear Code WV Volts 460 FLA 352.00 Oil Pump Voltage

Oil Pump

FLA

3.60

Capacity 400.00 Phase 3 LRA 2598.00 KW 243.00 HP 307.00

Refrigerant R-134A Freq. 60 IRA 362.00 Starter Type

VARIABLE SPEED Hot Gas

NOT LISTED

Evaporator

Evap EWT 52.00

Evap LWT 42.00

Evap Flow 960.00

Evap PD 10.60

Evap Fluid Type WATER

Evap Number of Passes

Evap FF 0.00010

Evap DWP 150

Evap Nozzle In C

Evap Nozzle Out B

Condenser

Cond EWT 85.00

Cond LWT 94.33

Cond Flow 1200.00

Cond PD 8.80

Cond Fluid Type WATER

Cond Number of Passes

Cond FF 0.00025

Cond DWP 150

Cond Nozzle In R

Cond Nozzle Out

S

Absorber Specific

HW EWT 0.00

HW LWT 0.00

HW Flow 0.00

HW PD 0.00

HW Fluid Type HW Number of Passes

HW FF 0.00000

HW DWP 0

HW Nozzle

HW Pressure 0.00

HW Steam Flow

0.00 benzel Typewritten Text

The minimum condenser flow rate on these chillers would be 549 GPM. Max is 1796 GPM.

benzel

CH-2

benzel

2,038 GPM

benzel Typewritten Text

84.2 F

benzel Typewritten Text

78.8 F

benzel Typewritten Text 95 F benzel

Existing cooling tower submital

Highlight benzel Highlight benzel Highlight benzel Highlight benzel

Highlight benzel Highlight benzel Highlight benzel

PAPER COPIES ARE UNCONTROLLED.

APPROVED ENGINEERING CHANGE ORDER (ECO).

ONLY BE INCORPORATED AS DIRECTED BY AN

MAINTAINED BY A CAD SYSTEM. CHANGES SHALL

THIS DRAWING HAS BEEN GENERATED AND IS

SUBMITTAL DRAWING

This drawing is submitted for spatial consideration only. Do not pre-plumb to these dimensions.

NOTES:

INLET & OUTLET ARE 2-1/2" MNPT PIPE.1.

MAXIMUM PRESSURE: 150 psi (10.3 bar).2.

MAXIMUM TEMPERATURE: 180ºF (82.2ºC).3.

PRESSURE LOSS: 5-12 psid (.3-.8 bar) AT RATED FLOW.4.

RATED FLOW: 95-155 gpm (21.5-35 m³/hr).5.

APPROXIMATE DRY WEIGHT: 63 lbs (29 kg).6.

FINISH: LAKOS BLUE (EXTERIOR ONLY).7.

37" 940

5-1/2" 140

5-9/16" 141

3/4" MNPT PURGE

OUTLET

INLET

6-1/4" 159

2-5/8" 67

8-5/8" 219

TOP VIEW

INLET

1/4"

CLASS P-1

MILD CARBON STEEL

LAKOS BLUE

STANDARD

REVISIONS

ECN REV. DESCRIPTION DATE APPROVED

C

EXCEPT AS OTHERWISE PROVIDED BY CONTRACT, THIS

DRAWING AND SPECIFICATIONS SHALL NOT BE REPRODUCED,

COPIED OR USED AS THE BASIS FOR MANUFACTURE OR

SALE OF MATTER DEPICTED HEREIN WITHOUT THE

EXPRESSED WRITTEN PERMISSION OF THE CLAUDE LAVAL

CORPORATION, OR ITS ASSIGNEES.

D

SH

REV.

D W

G N

O

UNLESS OTHERWISE SPECIFIED:

DIMENSIONS ARE IN: INCHES [mm]

DECIMALS

MATERIAL

FINISH

.XXX

.XXXX

TOLERANCES ARE:

FRACTIONS

± ±.XX

WORK ORDER

MFG

ENGR

SCALE

QTY. C

SIZE

APPROVALS1/4°

± .005

.0005 ±

.01 ±

ANGLES

DRAWN

ENGINEERED FOR:

TITLE

DATE

DWG NO.

EST. WT. SHEET

WWW.LAKOS.COM

FRESNO, CALIFORNIA 93727

CLAUDE LAVAL CORP.

R

REV.

UNDERGROUND

SURVEYS

LAVAL

ILB-0250, SEPARATOR

95-155 gpm, CARBON STEEL

100300 C

3:8 1 OF 1

100300

C

MODEL NO.

B

A A

C

D

4 12

2 14 3

2/18/09AMFDO NOT SCALE DRAWING

63 lb benzel Rectangle benzel

Existing side stream filter cooling tower

Commercial Water Goulds Water Technology

24 SH 1 Q 1 2 A 0 R

Example Product Code, Ejemplo Código del Producto

Mechanical Seals and O-Ring 0 = Pre-engineered standard For optional mechanical seal modify catalog order no. with seal code listed below.

Casing Rotation, Optional R = 3 o’clock B = 6 o’clock L = 9 o’clock NOTE: Rotation when viewed from suction end of pump.

Standard discharge position is 12 o’clock.

Motor Enclosure, Caja del motor

1 = ODP 5 = 3PH, TE PE 9 = 1PH, ODP PE

2 = TEFC 6 = 3PH, XP PE A = 1PH, TE PE

3 = Explosion Proof, Prueba de explosiones 7 = Wash down, Lavado

4 = 3PH, ODP PE 8 = 3PH, WD PE

Motor Voltage, Voltaje del motor 1 = 115/208-230 3 = 230 5 = 208-230/460 7 = 575 2 = 115/230 4 = 230/460 6 = 460 X = Non Std.

HP Rating, Potencia nominal, HP C = ½ F = 1.5 J = 5 M = 15 Q = 30 T = 60 D = .75 G = 2 K = 7.5 N = 20 R = 40 U = 75 E = 1 H = 3 L = 10 P = 25 S = 50 V = 100

Driver: Hertz/Pole/RPM, Fuerza motriz: Hertz/Polos/RPM 1 = 60/3500/1 3 = 60/1750/1 5 = 50/2900/1 2 = 60/3500/3 4 = 60/1750/3 6 = 50/2900/3

Material SH = 316L Stainless steel, Acero inoxidable

Pump Size, Tamaño de la Bomba 9 = 1 x 2 – 6 4 = 1½ x 2½ – 6 8 = 2 x 2½ – 8 10 = 1 x 2 – 8 7 = 1½ x 2½ – 8 6 = 2½ x 3 – 6 11 = 1 x 2 – 10 5 = 2 x 2½ – 6 22 = 2½ x 3 – 8 23 = 3 x 4 – 8 24 = 1½ x 2½ – 10 25 = 2 x 2½ – 10 27 = 2½ x 3 – 10 28 = 3 x 4 – 10

SSH S/M-GROUP NUMBERING SYSTEM

SISTEMA DE NUMERACIÓN DEL GRUPO-S/M SSH

Impeller Option Code - For optional impeller diameters modify catalog order no. with impeller code listed below. Select optional impeller diameter from pump performance curve.

NOTE: For trimmed impellers, use T for impeller code.

NOTE: Impellers will be trimmed in 1/16” increments only. If you are ordering a trim within 1/16” of the standard impeller, you will receive the standard impeller trim.

* Indicates impellers that can be trimmed

NOTE: Not all combinations of motor, impeller and seal options are available for every pump model. Please check with GWT on non-cataloged numbers.

NOTA: No todas las combinaciones de las opciones de motor, impulsor y sello están disponibles para cada modelo de bombas. Por favor verifique con GWT en los números no catalogados.

Frame Options, Opciones de mando Substitute, Description, Substituto Descripción

FRM2

7/8" Imp. Bore, Diámetro interior del impulsor 7/8"

FRM3

1¼" Imp. Bore, Diámetro interior del impulsor 1¼"

Sello Mecánico y Anillo ‘0’ 0 = Estándar aprobado. Para sello mecánico opcional modificar el número de orden del catálogo con el código del sello anotado abajo.

Rotación de la cubierta, opcional R = 3 hora B = 6 hora L = 9 hora NOTA: Rotación cuando está visto del extremo de la succión de la bomba. La posición estándar de la descarga es las 12.

Código del Impulsor Opcional - Para diámetros del impulsor opcional modificar el número de orden del catálogo con el código del impulsor anotado abajo. Seleccionar el diámetro del impulsor opcional de la curva de funcionamiento de la bomba.

NOTA: Para los impulsores cortados, utilice T para el código del impulsor.

John Crane Type 21 Mechanical Seal, Sello Mecánico John Crane Tipo 21

Seal Code, Código del Sello

Rotary, Rotativo

Stationary, Estacionario

Elastomers, Elastómeros

Metal Parts, Partes Metálicas

Part No., Pieza Número

180-210 Frames, Armazones

250-360 Frames, Armazones

Carbon Sil-Carb

Viton 316 SS, 316 Acero inoxidable

10K27 10K45

2 EPR 10K19 10K20

5 Sil-Carb Sil-Carb Viton 10K64 10K65

Impeller Code, Código del impulsor

Pump Size, Tamaño de la Bomba

9SH

1 x 2-6 Dia.

10SH

1 x 2-8

Dia.

11SH

1 x 2-10

Dia.

4SH

1½ x 2½-6

Dia.

7SH

1½ x 2½-8

Dia.

5SH

2 x 2½-6

Dia.

8SH

2 x 2½-8

Dia.

*6SH

2½ x 3-6

Dia.

*22SH

2½ x 3 – 8

Dia.

*23SH

3 x 4 – 8

Dia.

24SH

1½ x 2½ –

10 Dia.

25SH

2 x 2½

– 10 Dia.

*27SH

2½ x 3

– 10 Dia.

*28SH

3 x 4 – 10

Dia.

A 65⁄8 827⁄64 103⁄32 6¾ 8¼ 67⁄8 8¼ 75⁄16 91⁄16 91⁄16 97⁄8 97⁄8 103⁄8 105⁄8 B 67⁄16 81⁄16 917⁄32 63⁄8 713⁄16 67⁄16 7¾ 71⁄8 8¾ 811⁄16 9½ 9½ 915⁄16 10¼ C 511⁄16 711⁄16 91⁄8 61⁄16 7 513⁄16 7½ 615⁄16 8½ 87⁄16 93⁄16 91⁄8 99⁄16 913⁄16

D 53⁄8 73⁄8 8¾ 55⁄8 6¾ 5½ 73⁄16 611⁄16 8¼ 81⁄16 87⁄8 813⁄16 9¼ 97⁄16

E 71⁄8 55⁄16 67⁄16 51⁄8 67⁄8 63⁄8 77⁄8 711⁄16 89⁄16 83⁄16 8¾ 91⁄16

F 411⁄16 61⁄8 413⁄16 63⁄16 61⁄16 7½ 7½ 8¼ 715⁄16 811⁄16

G 43⁄8 47⁄16 55⁄8 71⁄8 71⁄8 711⁄16

H 43⁄16 611⁄16 67⁄8 J 6½ 6½ K 6 L 5½

NOTA: Los impulsores serán cortados en 1/16 " incrementos solamente. Si usted está pidiendo un ajuste dentro de 1/16 " del impulsor estándar, usted recibirá el ajuste estándar del impulsor.

* Indica los impulsores que pueden ser cortados benzel Rectangle benzel Rectangle benzel Rectangle benzel Rectangle benzel Rectangle benzel Rectangle benzel Rectangle benzel Rectangle benzel

(E) Filtration pump

Commercial Water Goulds Water Technology

PERFORMANCE CURVES – 60 HZ, 3500 RPM

CURVAS DE FUNCIONAMIENTO – 60 HZ, 3500 RPM

1251007550250

Model SSH / 11SH

40255

150 175

3530201510

20 HP

15 HP

22’

25'

27'

29'

43 EFF%

A 103/32" DIA.

B 917/32"

C 91/8"

D 83/4"

10 HP

Size (Tamaño) 1 x 2 - 10 RPM 3500 Curve (Curva) CN0616R00

METERS

METROS

FEET

PIES

TO

TA

L D

Y N

A M

IC

H

E A

D (C

A R

G A

D

IN

A M

IC

A

T O

TA

L)

(H

CAPACITY (CAPACIDAD) (Q)

U.S. GPM

NOTE: Not recommended for operation beyond printed H-Q curve.

NOTA: No se recomienda para funcionamiento superior al impreso en la curva H-Q.

NPSHR – FEET (PIES)

m3/hr

100500

150 200 250

5040302010

2 HP

3 HP

5 HP

10 HP

71/2 HP

61 63

EFF%61

12'

8'

F 411/16"

D 55/8"

B 63/8"

A 63/4" DIA.

G 43/8"

H 43/16"

C 61/16"

E 55/16"

Model SSH / 4SH Size (Tamaño) 11/2 x 21/2 - 6 RPM 3500 Curve (Curva) CN0488R01

METERS

METROS

FEET

PIES

TO

TA

L D

Y N

A M

IC

H

E A

D (C

A R

G A

D

IN

A M

IC

A

T O

TA

L)

(H

CAPACITY (CAPACIDAD) (Q)

U.S. GPM

NOTE: Not recommended for operation beyond printed H-Q curve.

NOTA: No se recomienda para funcionamiento superior al impreso en la curva H-Q.

5’ NPSHR – FEET (PIES)

m3/hr

Optional Impeller, Impulsor Opcional

Impeller Standard Code, Dia., HP Rating, Código del Diá. Estándar HP Impulsor Potencia

A 103⁄32" 20

B 917⁄32 15

C 91⁄8 15

D 8¾ 15

NOTE: Pump will pass a sphere to 1⁄8" diameter.

NOTA: La bomba pasará una esfera a 1⁄8" diámetro.

Optional Impeller, Impulsor Opcional

Impeller Standard Code, Dia., HP Rating, Código del Diá. Estándar HP Impulsor Potencia

A 6¾" 10

B 63⁄8 7½

C 61⁄16 7½

D 55⁄8 5

E 55⁄16 5

F 411⁄16 3

G 43⁄8 3

H 43⁄16 2

NOTE: Pump will pass a sphere to 3⁄16" diameter.

NOTA: La bomba pasará una esfera a 3⁄16" diámetro.

benzel Rectangle benzel Highlight benzel Highlight

71/2 HP

benzel Highlight benzel Line benzel Line benzel

(E) Filtration pump submittalSeries 4030 End suction base mounted split coupled series 403 0 performance curves

Performance curves are for reference only.

Confirm current performance data with Armstrong ACE Online selection software.

0.00

25.24

50.47

75.71

100.94

126.18

(0.0) 0

(6.1) 20

(12.2) 40

(18.3) 60

(24.4) 80 13.19 in

10.00 in

15 hp

20 hp

25 hp

30 hp

10 hp

75%

10.75 in

11.50 in

12.25 in

0.00

50.47

100.94

151.42

201.89

(0.0) 0

(12.2) 40

(24.4) 80

(36.6) 120

(48.8) 160

13.19 in

10.00 in

30 hp

75%

10.75 in

11.50 in

12.25 in flow USgpm (L/s) he ad ft (m flow USgpm (L/s) he ad ft (m

NPSHr

NPSHr

1800 rpm

1200 rpm

8 × 6 × 13

Curve number pt661-0-0-1800

Series

Size 8 × 6 × 13 rpm bhp based on shown Fluid’s sp. gr.

Availability 4030 all ratings 4280 all ratings

Performance guaranteed only at operating point indicated.

Curve shown for clear, cold water

– sp. gr. 1.0000

Curve number pt661-0-0-1200

Series

Size 8 × 6 × 13 rpm bhp based on shown Fluid’s sp. gr.

Availability 4030 all ratings 4280 all ratings

Performance guaranteed only at operating point indicated.

Curve shown for clear, cold water

– sp. gr. 1.0000

Hymanson Line

Hymanson Line

Hymanson Text Box

(E) Condenser Pumps CWP-1,2,3

Hymanson Pen www.usmotors.com 56

VARIABLE SPEED

MOTORS AND DRIVES

C-FACE

M

OTORS

HAZARDOUS

LOCATION

COOLING TOW

ER

DUTY

GENERAL PURPOSE

AUTOM

OTIVE DUTY

GENERAL PURPOSE

HAZARDOUS LOCATION

GENERAL PURPOSE

OPEN DRIPPROOF

GENERAL PURPOSE

841 PLUS

GENERAL PURPOSE

CORRO-DUTY

GENERAL PURPOSE

HOSTILE DUTY

GENERAL PURPOSE

C-FACE

GENERAL PURPOSE

UNIM

OUNT®

General Purpose Three Phase Open Drip Proof (ODP) NEMA®† Premium Efficient (continued)

DE, RE

HP

RPM

Voltage

Frame

Catalog Number

List

Discount Symbol SF "C" Dim.

(inches) Ship Wt.

(lbs.)

NEMA

Nom. Eff.

Full Load

Amps

Notes

40 3600 200 286TS D40P1HS $2,883 DS-3E 1.15 23.5 250 93.0 104 02

3600 208-230/460 286TS D40P1DS $2,883 DS-3E 1.15 23.5 250 93.0 104-90/45 02,03

3600 575 286TS D40P1GS $2,883 DS-3E 1.15 23.5 362 93.0 36

1800 200 324T D40P2H $2,889 DS-3E 1.15 25.8 454 94.1 105 02

1800 200 324TS D40P2HS $2,889 DS-3E 1.15 25.8 454 94.1 105 02

1800 208-230/460 324T D40P2D $2,889 DS-3E 1.15 27.3 385 94.1 102-91/46 02,03

1800 208-230/460 324TS D40P2DS $2,889 DS-3E 1.15 25.8 454 94.1 102-91/46 02,03

1800 575 324T D40P2G $2,889 DS-3E 1.15 27.3 454 94.5 37

1800 575 324TS D40P2GS $2,889 DS-3E 1.15 25.8 454 94.1 36 02

1200 230/460 364T D40P3E $5,786 DS-3E 1.15 28.7 580 94.5 92/46 02,03

1200 575 364T D40P3G $5,786 DS-3E 1.15 28.7 580 94.5 37 02

900 230/460 365T D40P4E $7,020 DS-3E 1.15 29.7 600 92.4 106/53 02,03

50 3600 200 324TS D50P1HS $3,243 DS-3E 1.15 25.8 385 93.0 134 02

3600 208-230/460 324TS D50P1DS $3,243 DS-3E 1.15 25.8 450 93.0 130-117/59 02,03

3600 575 324TS D50P1GS $3,243 DS-3E 1.15 25.8 385 93.0 47 02

1800 200 326T D50P2H $3,386 DS-3E 1.15 27.3 415 94.5 130 02

1800 200 326TS D50P2HS $3,386 DS-3E 1.15 25.8 415 94.5 130 02

1800 208-230/460 326T D50P2D $3,386 DS-3E 1.15 27.3 460 94.5 126-113/56 02,03

1800 208-230/460 326TS D50P2DS $3,386 DS-3E 1.15 25.8 415 94.5 56 02,03

1800 460 & 380 326TS D50P2FS $3,386 DS-3E 1.15 25.8 415 94.5 56 02,03

1800 575 326T D50P2G $3,386 DS-3E 1.15 27.3 460 94.5 46

1800 575 326TS D50P2GS $3,386 DS-3E 1.15 25.8 415 94.5 45 02

1200 230/460 365T D50P3E $6,506 DS-3E 1.15 29.7 580 94.5 115/57

1200 575 365T D50P3G $6,506 DS-3E 1.15 29.7 580 94.5 46 02

900 230/460 404T D50P4E $8,364 DS-3E 1.15 32.5 750 92.4 132/66 02,03

60 3600 200 326TS D60P1HS $4,469 DS-3E 1.15 25.8 460 93.6 155 02

3600 208-230/460 326TS D60P1DS $4,469 DS-3E 1.15 25.8 460 93.6 152-134/67 02,03

3600 575 326TS D60P1GS $4,469 DS-3E 1.15 25.8 415 93.6 54 02,14

1800 230/460 364T D60P2E $4,657 DS-3E 1.15 28.7 580 95.0 138/69 02,03

1800 230/460 364TS D60P2ES $4,657 DS-3E 1.15 26.6 580 95.0 138/69

1800 460 & 380 364TS D60P2FS $4,657 DS-3E 1.15 26.6 580 95.0 69

1800 575 364T D60P2G $4,657 DS-3E 1.15 28.7 580 95.0 55 02

1800 575 364TS D60P2GS $4,657 DS-3E 1.15 26.6 580 95.0 55 02

1200 230/460 404T D60P3E $7,706 DS-3E 1.15 32.6 750 95.0 137/69 02,03

1200 575 404T D60P3G $7,706 DS-3E 1.15 32.6 750 94.5 55

900 230/460 405T D60P4E $9,698 DS-3E 1.15 34.0 800 93.0 157/79 02,03

75 3600 230/460 364TS D75P1ES $5,886 DS-3E 1.15 26.6 580 94.1 171/86

3600 575 364TS D75P1GS $5,886 DS-3E 1.15 26.6 580 94.1 69 02

1800 230/460 365T D75P2E $5,514 DS-3E 1.15 29.7 735 95.0 172/86 02,03

1800 230/460 365TS D75P2ES $5,514 DS-3E 1.15 27.6 600 95.0 172/86

1800 460 & 380 365TS D75P2FS $5,514 DS-3E 1.15 27.6 600 95.0 86

1800 575 365T D75P2G $5,514 DS-3E 1.15 29.7 600 95.0 69 02

1800 575 365TS D75P2GS $5,514 DS-3E 1.15 27.6 600 95.0 69 02

1200 230/460 405T D75P3E $8,674 DS-3E 1.15 34.1 800 95.0 172/86 02,03

1200 575 405T D75P3G $8,674 DS-3E 1.15 34.1 800 94.5 69 02

900 230/460 444T D75P4E $11,665 DS-3E 1.15 39.8 1100 94.1 194/97 02,03

Note 02 Suitable for Wye-Delta start on voltages shown Note 03 60/50 Hz rated with no derate on HP; 230/460 volt 60 Hz ratings operate on 190/380 volt 50 Hz, 460V 60 Hz ratings operate on 380V 50 Hz;

Full 60 & 50 Hz data on Nameplate Note 14 NEMA Design A

Hymanson Highlight 1800 230/460 365T

Hymanson Highlight

D75P2E $5,514 DS-3E 1.15 29.7 735 95.0

Hymanson Highlight 172/86 02,03 benzel Rectangle benzel

(E)Condenser pump motor CDW-1,2,3

SERIES 1510

Hymanson Line

Hymanson Line

Hymanson Pen

Hymanson Text Box (E)CHP1D free cooling chilled water pump 1800 RPM

SERIES 1510

Hymanson Text Box CWP2D free cooling condenser water: 1800 RPM

Hymanson Line

Hymanson Pen

(E)Heat exchanger

CALCULATED BY LB DATE 27 Feb. 2023

SECTION 3

COOLING TOWERS

CALCULATED BY LB DATE Feb 2023

COOLING TOWERS

1. Replace (2) Nominal 400-ton cooling towers of the roof.

a. Summer Consultants investigated relocating the cooling towers to grade to remove a water source on roof over the library stacks. A letter sent to USDA, dated 7 December 2022 , identified design benefits and drawbacks to have the cooling towers on grade versus on the roof (the existing location)

b. USDA/NAL decided to keep the cooling towers located on the roof for reasons of noise and historical impacts.

2. Condenser Water Flow

a. The building is presently configured with constant speed condenser water pumps at 3 gpm/ton.

b. Historically condenser water systems were selected on a 10°F temperature difference that resulted in system sized at 3 gallons per minute (gpm) per ton.

c. Current best practice is to reduce pump energy by increasing the tower delta T (difference between entering and leaving water temperatures) and selecting the systems for 2 gpm per ton with a corresponding 15°F temperature difference. This reduces pump energy for the condenser water and reduces the size of the cooling towers.

d. CTI certification (recommended) limits the cooling tower approach to 5°F. (The approach is the difference between the ambient wet bulb and tower water leaving temperature.)

- Ambient wet bulb for this location is 78°F

- 95°F entering water temperature is base on AHRI stan

- 5°F approach = 78°F+5°F = 83°F tower leaving water temperature

- tower operating range will be 95°F to 83°F

- tower delta T = 95-83 = 12°F

i. The ambient wet bulb conditions for Beltsville, MD are 78°F Wb, we are limited to a 5°F approach to achieve CTI certification. The CTI certified operating range can be 95°F to 83°F at 78°F Wb ambient wet bulb. This results in a design temperature difference of 12°F.

ii. Existing tower flow 3 gpm/ton

1. Per cell – 6,000,000 (BTH/hr) / 500 / (95°F-85°F) = 1,200 gpm

iii. Proposed tower flow – 2.5 gpm/ton

1. Per cell – 6,000,000 (BTH/hr) / 500 / (95°F-83°F) = 1,000 gpm

e. The proposed controls and condenser water flow will reduce pump energy, maximizing the use of cooling tower fill and cooling tower fan operation.

CALCULATED BY LB DATE Feb 2023

f. The existing chillers CH-1 and CH-2 have a minimum flow of 550 gpm on the condenser water loop, so the condenser water flow can be reduced. The chiller will require reprogramming of the minimum flow safety setting on the chillers to prevent unwarranted chiller shutdowns.

g. Verifying existing pumps

i. The existing condensing water pumps have a pressure drop rating of 143 feet of water with a flow rate of 1200 GPM. A pressure drop calculation was done to determine if the existing pumps are adequately sized when the condenser water flow rate is reduced to 1000 gpm. The calculated condensing water piping pressure is 90 feet of head.

ii. The existing condenser water pump curve shows an inability to perform at a pressure of 90 feet of head and flow of 1000 gpm. New pumps will need to be provided. See section M-4.0 Pumps for equipment sizing and selection.

3. Selections

a. (2)cell Nominal 400-ton cooling towers.

b. 95°F to 83°F at 78°F Wb ambient wet bulb (to maintain 5°F approach). Condenser water flow of 1,000 gpm per cell (2.5 gpm/ton).

c. fan per cell – (1) 30 hp per cell serving 2 fans. Provide with VFD.

i. Provide reversible VFD with internal bypass.

ii. Provide class F insulation

iii. belt driven

d. Factory Mutual approved

e. Electronic water level controller

f. Galvanized steel with stainless steel Basin only

g. Provide railing at top of towers and ladders with safety cage.

h. Provide with bottom inlets and bottom outlets to configure piping with dunnage.

i. Basis of design

i. SPX Cooling Tech, LLC (per cell) - AV Series model AV6817SAN

1. Dimension – 12' - 0 1/2”L x 11' - 11"W x 18' - 0”H

2. shipping weight – 10,144 lbs

3. Heaviest section – 5,347 lbs

4. Operating weight – 19,694 lbs

5. Basin heater – (1) 9 KW electric resistance

ii. BAC (Per cell) – 1500 series Model S15E-1212-12LN

CALCULATED BY LB DATE Feb 2023

1. Dimension – 11’-11.75”L x 11’-10”W x 18’-2.25”L

2. shipping weight – 9,430 lbs

3. Heaviest section – 4,930 lbs

4. Operating weight – 19,000 lbs

5. Basin heater – (1) 12 KW electric resistance

j. Spring isolators

i. 4" deflection isolator for cooling tower isolation

ii. Basis of design

1. Kinetics

k. Makeup water

i. Cooling Tower Cycles of Concentrations = Conductivity of Blowdown Water ÷ Conductivity of Make-Up Water

1. Conductivity of Blowdown Water (parts per million of TDS)

2. Conductivity of Make-Up Water (parts per million of TDS)

3. USE – 3 cycles for worst case sizing but anticipate 4-6 cycles. Used in Bleed rate formula.

ii. Evaporation rate = Flow x range x 0.001

1. 2,000 GPM x 12 x 0.001 = 24 GPM

iii. Bleed Rate = Evaporation rate / (# of cycles – 1)

1. 24 gpm/ (3-1) = 12 GPM

iv. Drift rate = 0.002%-0.005% of total flow

1. 2,000 gpm x 0.003% = 6 gpm

v. Makeup = Bleed Rate + Evaporation rate + Drift loss

1. Make up = 42 GPM

l. Water treatment is maintained through their maintenance contractor: BOND WATER

TECHNOLOGIES, INC.

m. Heat Trace Requirements:

i. <3” pipe = 3 watts/lf

ii. 3”- 6” pipe = 5 watts/lf

iii. 8”-12” pipe = 10 watts/lf

n. Filtration

CALCULATED BY LB DATE Feb 2023

i. Side flow stream – size to cycle water volume of system 1/per hour.

ii. 3,200 gallons in piping + 1,100 gallons in towers * 1 hr/60 min = 71 gpm of side filtration

iii. Use existing filtration skid and pump for side filtration. Provide ports on towers for future basin sweepers.

o. Drain: currently the towers are drained to the roof storm drain.

i. This no longer meets county ordinances. The cooling towers drains will tie into the existing plumbing waste in the penthouse. There is an existing floor drain next to the existing filtration system.

F:\PROJECTS\21\212 USDA NE AE Services\212.007 BARC Nat Ag Library Towers\Calcs\Mech\M-3.0 Cooling Towers\212.007 M-3.0 Cooling towers.docx

Baltimore Aircoil Company Cooling Tower Selection Report

Version: 8.11.18 NA Product data correct as of: November 14, 2022

Project Name: BARC Nat Ag Library Selection Name: 2.5 GPM Per Ton - low hp Project State/Province: Maryland Project Country/Region: United States Date: February 02, 2023

Model Information Design Conditions Product Line: Series 1500 Flow Rate: 1,000.00 USGPM Model: S15E-1212-12LN Hot Water Temp.: 95.00 °F Number of Units: 1 Cold Water Temp.: 83.00 °F Fan Type: Standard Fan Wet Bulb Temp.: 78.00 °F Fan Motor: (2) 15.00 = 30.00 HP/Unit Heat Rejection: 5,997,600 BTUH Total Standard Fan Power: Full Speed, 30.00 BHP/Unit Tower Pumping Head: 7.81 psi Intake Option: None Internal Option: None Discharge Option: None

Tower Heat Rejection: 6,178,050 BTUH Reserve Capability: 3.00 %

Thermal performance at design conditions and standard total fan motor power is certified by the Cooling Technology Institute (CTI).

Engineering Data, per Unit Unit Length: 11' 11.75"

Unit Width: 11' 10.00"

Unit Height: 18' 02.25"

Air Flow: 101,620 CFM

Approximate Shipping Weight: 9,430 pounds

Heaviest Section: 4,930 pounds

Approximate Operating Weight: 19,000 pounds

Heater kW Data (Optional)

0°F (-17.8°C) Ambient Heaters: (1) 12 kW

-20°F (-28.9°C) Ambient Heaters: (1) 16 kW

Minimum Distance Required for Single Unit:

(For multiple units, refer to Layout Guidelines)

From Solid Wall: 7 ft.

From 50% Open Wall: 3 ft.

Energy Rating:

53.00 USGPM/HP per ASHRAE 90.1, ASHRAE 189 and CA Title 24.

Note: These unit weights and dimensions account for the selected fan type for the standard cataloged drive configuration, but they do not account for other options/accessories. Please contact your local BAC sales representative for weights and dimensions of units with other options/accessories.

Page 1/1 benzel Line benzel Typewritten Text (1) benzel Text Box per manufacturer: minimum flow rate is 358 GPM per cell

Submittal Data Form 6-7-2024

Sold To :

Summer Consultants, Inc.

7900 Westpark Dr #A405 McLean, VA 22102 United States

Project: BARC Nat AG Library Sold To :

Summer Consultants, Inc.

7900 Westpark Dr Purchase Order No:7900 Westpark Dr #A405 Engineer:#A405 McLean, VA 22102 BAC Order # Q24001150101McLean, VA 22102 United States

Configuration Version:

Representative:

The Morin Company - MD

All Information is per Unit

Quantity: 1 Model S15E-1212-12LN-2 COOLING TOWER

Certified Capacity: 2000.00 USGPM of water from 95.00°F to 83.00°F at 78.00°F entering air wet bulb.

Fan Motor(s): Two (2) 30 HP fan motor(s): Totally Enclosed, Air Over (TEAO), 1 Speed/1 Winding - Premium Efficiency (Inverter Duty), suitable for 460 volt, 3 phase, 60 hertz electrical service and Space Heater.

Drives are based on 0 inches ESP.

NOTE: Inverter Duty fan motors, furnished in accordance with NEMA Standard Mg.1 -- Part 31, are required for applications using variable frequency drives for fan motor control.

Submittal Information Equipment Summary BAC Terms and Conditions of Sale Mechanical Specifications Submittal Drawings/Diagrams

UP-Q24001150101 Unit Print SS-Q24001150101 Unit Support CG-Q24001150101 Center of Gravity BC-Q24001150101 Bottom Connections HW-Q24001150101 Heater Wiring VL-Q24001150101 VCOS Location VW-Q24001150101 VCOS Wiring EA-Q24001150101 External Access IA-Q24001150101 Internal Access SW-Q24001150101 Space Heater Wiring

Induced Draft, Crossflow Cooling Tower Quality Assurance - ISO 9001 Compliant Unit Energy Efficiency per ASHRAE Standard 90.1-2016 CTI Certified Thermal Performance Steel Panels and Structural Members are Constructed of Galvanized Steel with a Type 304 Welded Stainless Steel Cold Water Basin Standard Fan Driven by BALTIDRIVE® Power Train Galvanized Steel Fan Guard PVC Fill & Drift Eliminators Structure Designed in accordance with the 2012 IBC Top Inlet Connections Pump Suction Connection Bottom Equalizer Less Flume Box Mechanical Float Valve Assembly Electric Immersion Heater(s) Sized to Maintain +40°F water at a 0°F Ambient with Electrical Requirements Matching Fan Motor(s) Copper Heater Elements Electric Immersion Heater Controls PVC Basin Sweeper Piping System Mechanical…