6-4d - MPL-25-013 Appendix 4 FFS Mechanical System.pdf

Appendix 7 Milwaukee Public Library – Martin Luther King Branch

Mechanical Systems

Mechanical System

1. General Conditions

a) Overview

i) This appendix presents the Library’s minimum requirements and standards for the concept development, design and construction of their building mechanical systems.

ii) The Library will provide direction to the design team regarding the need for a feasibility study for system configuration selection. Selection criteria will vary depending on the specifics of the particular project.

iii) The Library will also consider alternative energy systems that could be candidates for a particular project.

b) Administration

i) Consultant shall coordinate with utility representative and develop new or renovated service design with the respective utility. Utilities include natural gas and electricity as necessary.

ii) Permits and other associated fees required by the City of Milwaukee and the State of

Wisconsin shall be secured and paid for by Contractor.

iii) All work shall be performed within an industry acknowledged standard of care, using only new quality materials.

iv) Contractor shall guarantee entire installation for a period of one year after acceptance.

Repair or replacement of faulty equipment shall be done with no cost to the Library.

2. Codes and Standards

a) All work shall be done in accordance with all applicable local, state and federal codes.

b) The following codes, standards and guidelines will be used for the design as applicable or as directed by the authorities having jurisdiction.

i) Wisconsin Administrative code, Department of Safety and Professional Services SPS chapters 340, 341, 345 and 361 through 366, latest edition and referenced Appendices.

ii) NFPA standards as referenced in the Wisconsin Administrative Code and City of Milwaukee

Ordinances and codes.

iii) American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE).

iv) Sheet Metal and Air Conditioning Contractors national Association (SMACNA).

v) Requirements of Insurance Carrier

c) The codes, standards and guidelines listed indicate recommended or minimum requirements.

Based on input from Library representatives and recommendations from the consultant may be exceeded.

d) Design and installation of materials and equipment shall conform to the following standards as applicable:

i) UL

ii) ASME

iii) ASTM

iv) NFPA

v) OSHA

vi) SMACNA

vii) ASHRAE

viii) ASPE

ix) AWWA

x) AWS

xi) NSF

xii) MICA

xiii) CISPI

xiv) IRI

xv) Other applicable standards

3. HVAC Design Conditions

a) The proposed building space shall be defined in the specific building design criteria. The following indoor and outdoor conditions are to be used for the design of the HVAC systems:

Area/Type Summer Winter

Exterior 95 DB/75 Deg F (better than

ASHRAE 0.4%

‐10 Deg F (Better than ASHRAE 0.4%)

Interior

Library spaces, Office Spaces, Conference, Study and Meeting Rooms, Common areas

75 Deg F/50% RH Maximum 68 Deg F/ 50% RH

Restrooms, Janitor Closets and similar spaces

80 Deg F 68 Deg F/50% RH

Telecommunication, Data Closets and similar spaces

66 Deg F/35% RH 66 Deg/35% RH

Electrical Equipment Rooms 75 Deg F/35% RH 75 Deg F/35% RH

Mechanical Equipment Rooms 80 Deg F/50% RH 65 Deg F

b) The following criteria are to be used in the design of HVAC‐Related Background Sound in Rooms.

i) Maintain maximum 25 RC in the following Rooms:

(1) Library spaces

(2) Conference Rooms

(3) Study Rooms

(4) Meeting Rooms

ii) Maintain maximum 30 RC in the following Rooms:

(1) Manager Office

(2) Private Office

iii) Maintain maximum 35 RC in the following spaces

(1) Open Office areas

(2) Staff Work Room

(3) Restrooms

iv) Maintain maximum 45 RC in the following spaces:

(1) Mechanical and Electrical Equipment Rooms

(2) Telecommunication Rooms

(3) Data Rooms

v) ASHRAE Standards will be followed for other rooms and spaces.

4. HVAC Demolition, when required

a) All existing material and equipment required for demolition shall be completely removed from the site.

b) The Library shall have the right to keep any material and equipment when requested by the

Library.

c) The entire HVAC system will be demolished except as noted on design/construction documents.

5. New Heating, Cooling and Ventilation System Description/Requirements

a) Option 1 Conventional Natural Gas fuel source

i) Heating (hot water) shall incorporate high efficiency boilers, direct vent, sealed combustion, condensing type boilers. Each boiler will have a dedicated primary in line circulating pump.

System shall include minimum two boilers for redundant operation. The boiler(s) shall be located in the mechanical room.

(1) Boiler brand

(a) Buderus

(b) HTP Elite FT

ii) Hot water heating distribution system shall be a primary/secondary pumping system the primary boiler circulating pump shall be designed according the system demand requirements. Secondary pumps shall be variable speed, in line type. Pumps are to be piped in parallel with one pump as back up and lead/lag operation. Variable speed pumps will each have a dedicated variable speed drive controller. The pumps shall be located in the mechanical room.

(1) Pump brand: B&G (Bell & Gossett)

(2) Variable speed drive brand: ABB

iii) The heating system shall provide hot water heat to entire Library space/building, serving unit heaters, radiation, VAV reheat coils.

iv) All hot water pre‐heating coil(s) in air handler units (AHU) shall be piped with indicated inline circulating pump(s).

v) Chilled water cooling equipment

(1) Chilled water shall be provided by either DX cooling or chiller unit depending on Library building site configuration.

vi) Air handler will be provided for circulating air through the building zones. The unit will be designed to provide code turnover rates and meet demands of the zone activity.

(1) Configuration will include relief fan for modulating building pressure

(2) Supply fan

(3) Return air fan

(4) Ultra Violet light disinfection component

(5) Filter package, 2 banks

(a) Pre filter bank 2”, MERV 13

(b) After bank 2”, MERV 13 or better

(c) Hepa solution should be considered in design.

(6) Brands

(a) Trane

(b) York

vii) Ventilation shall be accomplished with a dedicated ventilation unit to provide 100% outside air to the building and 100% exhaust from the building. The air handling unit will supply and exhaust the CFM rate that meets or exceed code requirements. The unit will include DX cooling and gas heat and total energy wheel. The unit will provide all required ventilation for the Library space/building.

b) Heating, Cooling and Ventilation system Option 2

i) Heating will be provided by a geothermal ground source heat pump system consisting of geothermal wells, geothermal loop system pumps, air‐to‐water heat pumps and water‐to‐ water heat pumps.

ii) A geothermal well field of sufficient capacity to meet heating and cooling demand for the

Library space/building.

iii) Geothermal loop pumps will be in line, constant speed and piped in parallel with one pump as back‐up in lead/lag operation. Each pump will have a dedicated variable speed drive controller. The pumps will be located in the mechanical room.

(1) Pump brand: B&G

iv) Geothermal loop will provide loop water to all heat pump units located throughout the

Library space/building.

v) Air‐to‐water heat pumps units will provide heating or cooling air to all spaces throughout the Library. Heat pumps shall be located in mechanical rooms. Mechanical rooms may be secondary to the main mechanical room to facilitate efficient air duct design according to the Library space layout.

vi) Water‐to water heat pumps shall be used for radiant floor heat

vii) A separate water‐to –water heat pump shall perform pre‐heating of domestic hot water.

c) Humidity control

i) Winter humidity shall be provided by a steam unit powered by electricity. Unit shall be sized according to the building volume and infiltration rate. Unit shall be installed according to manufacturer’s requirements.

ii) Summer dehumidification shall be accomplished by passive means. Cooling coils shall have condensate collection systems that discharge via air break to clear water storm drains hubs.

d) HVAC piping systems

i) Hot water heating supply and return piping shall be the following:

(1) Schedule 40 steel with 125 lb. welded, flanged or threaded fittings.

(2) Type “L” copper with wrought copper solder fittings and 95/5 solder

(3) Type “L” copper with Pro Press type copper fittings

ii) Chilled water cooling supply and return piping shall be the following:

(1) Schedule 40 steel with 125 lb. welded, flanged or threaded fittings.

(2) Type “L” copper with wrought copper solder fittings and 95/5 solder

(3) Type “L” copper with Pro Press type copper fittings

iii) Heat pump loop water supply and return piping shall be the following:

(1) SDR 11 HDPE for 2.5” and smaller diameter pipe

(2) SDR 15.5 HDPE for 3” and larger diameter pipe

iv) Refrigerant piping shall be the following:

(1) Type “ACR” copper with brazed fittings.

v) Cooling coil condensate drain piping shall be the following:

(1) Type “L” copper with wrought copper soldered fittings and 95/5 solder

(2) Type “L” copper with Pro Press type copper fittings

6. Hot Water Heating Terminal Unit Options

a) In‐floor radiant system will consist of PEX pipe loops encased in concrete or attached to under floor systems. The system will consist of zones specific to the Library space assignment developed by the Library and Consultant. Each zone will be thermostatically controlled. The individual loops will be connected to a hot water manifold and energized by a dedicated circulation pump and flow solenoid valve. System manifold, circulation pump and solenoid valve will be located in the mechanical room.

b) Finn tube radiation heaters will be used for exterior perimeter windows. Finn tube radiation arrays will be thermostatically controlled and connected in parallel to a main hot water circulation loop. Side stream flow shall be controlled by a solenoid valve located in an accessible location.

c) Unit heaters will be provided for vestibules, small rooms, and mechanical rooms. Each unit will be thermostatically controlled. Unit shall include 3 way valve for cooling function.

d) Reheat coils will be provided at VAV boxes and air handler(s).

7. Air Distribution Duct Systems

a) Supply, return and exhaust air will be transported through galvanized steel sheet metal ducts constructed to SMACNA standards. Ductwork shall be rectangular, round or flat oval.

b) Duct pressure ratings will be as follows:

i) Supply air ductwork up stream of VAV boxes shall be constructed to 4” positive pressure class.

ii) Supply air ductwork downstream of VAV boxes shall be constructed to 2” positive pressure class.

iii) Supply air ductwork in constant volume systems shall be constructed to 2” positive pressure class

iv) Return, relief and exhaust air ductwork shall be constructed to 2” positive or negative pressure class as required.

v) Grills, register and diffusers will be steel, aluminum or extruded aluminum with finish as scheduled.

8. Mechanical Systems Insulation

a) Indoor concealed supply air ducts shall be insulated on the exterior with 1 ½” flexible fiberglass wrap and FSK jacket.

b) Outdoor supply air ducts will be insulated with 4 in. rigid fiberglass bard and weatherproof mechanically attached vinyl jacket.

c) Indoor exposed supply air ducts will be insulated with 1 in. acoustical duct liner.

d) Outdoor return and exhaust ducts will be insulated with 4 in. rigid fiberglass board and weather proof mechanically attached vinyl jacket.

e) Indoor return air ducts will not be insulated.

f) Indoor exhaust air ductwork shall be insulated on the exterior with 2” rigid fiberglass board and

FSK jacket between outdoor connection and isolation damper. Remaining exhaust ductwork will not be insulated.

g) The use of internal duct liner will be used where required to achieve design system sound levels.

Duct liner will be of fiber free material.

h) Hot water heating supply and return piping will be insulated with pre‐formed fiberglass pipe insulation and white kraft paper jacket. Fittings will be jacketed with preformed PVC fitting covers.

i) Chiller water cooling supply and return piping will be insulated with preformed fiberglass pipe insulation and white kraft paper jacket. Fittings will be jacketed with preformed PVC fitting covers.

j) Loop water supply and return piping will be insulated.

k) Refrigerant suction piping will be insulated with preformed flexible elastomeric foam insulation.

l) Heat pump cooling coil condensate drain piping will be insulated with pre‐formed fiberglass pipe insulation and white draft paper jacket. Fittings will be jacketed with preformed PVC fitting covers.

m) Domestic cold water make up supply piping will be insulated with pre‐formed fiberglass pipe insulation and white draft paper jacket. Fittings will be jacketed with preformed PVC fitting covers.

9. Air Terminal Units

a) Air terminal units shall be single duct variable air volume (VAV) boxes with integral hot water heating coils.

b) Air‐to‐water and water‐to‐water heat pumps will be manufactured by Water Furnace or equal.

10. Vibration Isolation

a) Vibration isolators shall be provided for all fans and pumps.

b) Vibration isolation hangers and connections will be provided on pipe and ductwork connected to vibrating equipment.

11. HVAC Controls and Instruments

a) The Temperature Control system shall be state of the art Direct Digital Control (DDC) system.

b) The DDC system will be new complete Johnson Controls Metasys Extended Architecture system.

c) The DDC system will have web‐based access and include full system color graphics identifying all respective control points.

d) All ventilation, heating and cooling system will be controlled by the DDC system.

e) All system equipment shall interface with the DDC system to provide control and monitoring of all available points provided by equipment manufacturers. Provide DDC interface where required to maintain compatibility.

f) Supply, return and outdoor air intake for each air handling unit will be provided with air flow measuring stations for measurement and control of system air flow.

g) System sub meters shall be provided to measure sub system energy consumption. Meters shall be connected to the JCI Metasys Extended Architecture program

i) Electrical

(1) Lighting

(2) HVAC

(a) Air handler and ventilation

(b) Circulation pumps

(c) Air conditioning equipment

(d) Heat pump(s)

(3) Natural gas

(a) Boilers

(b) Appliance(s)

(4) Water

(a) Domestic cold water

(b) HVAC feed water

(c) Exterior hose bibs, Lawn and Landscape Irrigation, as required

12. Test and Balance

a) Mechanical systems shall be tested and balanced by an independent testing and balancing

Contractor.

b) Contractor shall retain a qualified independent firm to provide the services for testing and balancing of the air and hydronic systems in the project. The services will be provided by a firm specializing in testing and balancing air and hydronic systems in building construction and be certified by the (AABC) or National Environmental Balancing Bureau (NEBB). Contractor shall provide drawings, shop drawings and specifications to the balancing Contractor.

13. Diagnostic Software

a) Johnson Controls, Inc., Metasys Enterprise Diagnostic Program shall be provided, configured and licensed to provide energy optimization suite:

i) Enterprise Dashboard

ii) Enterprise Portal

iii) Reporting Module

iv) Green Kiosk Dashboard

v) Meter Analysis Tool

vi) Fault Analysis Tool

14. Operation and Maintenance Completion and Documents

a) Contractor shall provide the following

i) Identification tags for all valves

ii) Valve schedule listing ID no., brand, model no., size, location and purpose

iii) Equipment Identification label including: equipment name and ID no.

iv) Pipe identification labels include flow direction and color coding according to ANSI standards

v) Operation instruction for each device

vi) Maintenance instructions and training

b) Contractor shall provide orientation instructions for winter and summer start‐up seasons.

i) Change over control and set point adjustments

ii) Equipment shut down for inspection and repair

iii) Equipment preventative and routine maintenance procedures:

(1) Air handler

(2) VAV

(3) Humidifier

(4) UV disinfection

(5) Pumps

(6) Boiler(s)

(7) Chiller

(8) DX cooling system

(9) Unit heaters

(10) Duct cleaning

iv) Operation and Maintenance manual

(1) Equipment manufacturer’s owner’s and maintenance documents

(2) Shop drawings

(3) Record drawings

(4) Video record of training sessions

15. Third Party Commissioning

a) Consultant shall specify that Contractor shall retain a third party Commissioning agent to perform commissioning of complete HVAC system and each component.

i) Air flow

ii) Primary and secondary pump flows

iii) Circuit setting flows as necessary

iv) Stage or dynamic control program settings

v) Instrument calibration

vi) Heating performance

vii) Cooling performance

viii) Economizer performance

ix) Ventilation

x) Relief fan/building pressure

xi) Split system/heat pump performance

xii) Unit heater performance