Building298_Part3_Ch6_D30-Revised.pdf

Repair Building Envelope and Interior Finishes, Building 298 WO # N40085-19-F-6882 Building 298, Cherry Point, North Carolina

PART 3 - CHAPTER 6 - Page 655 06/17/2020

D30 HVAC

Refer to Part 4 Section D30 for performance requirements of the building elements included in the HVAC system.

SYSTEM DESCRIPTION

The second floor east wing and the library is excluded from this project. Provide a heating, ventilating and air conditioning (HVAC) system for the remainder of the building that attains the following objectives:

Occupant comfort, Indoor air quality, Acceptable noise levels, Energy efficiency, Reliable operation, and Ease of maintenance. Design and install in accordance with the International Mechanical Code (IMC), including the IMC supplemental requirements within UFC 3-410-01, Mechanical Engineering. Refer to Building Requirements, Space Tabulations Section of the Project Program for building occupancy levels. Any combination of equipment that attains these goals, and meets the requirements outlined below, will be acceptable.

Perform life cycle cost analysis and provide one of the following types of high performance systems:

VAV system with single duct and series fan powered boxes and hot water reheat. Chilled water shall be generated via air-cooled chiller(s) and meeting the minimum part load IPLV in accordance with Federal Energy Management Program (FEMP) or Energy Star efficiency requirements.

Heating system hot water shall be generated via natural gas fired condensing boilers.

Direct Expansion (DX) split systems and packaged units with hot water coils. The DX coil shall have a minimum SEER rating in accordance with

ASHRAE 90.1.

4-pipe fan coil units with chilled and hot water coils and a dedicated outdoor air system (DOAS) using chilled and hot water coils. Chilled water shall be generated via air-cooled chiller(s) and meeting the minimum part load IPLV in accordance with Federal Energy Management Program (FEMP) or Energy Star efficiency requirements . Heating system hot water shall be generated via propane fired condensing boilers.

Supply air from the DOAS shall be delivered at neutral conditions between 68 to 76 degrees Fahrenheit and have a maximum relative humidity of 50%.

Air cooled variable refrigerant flow (VRF) system and a dedicated outdoor air system (DOAS) using chilled and hot water coils. VRF system shall consist of one or more air-cooled heat pump compressor units serving multiple indoor fan coil refrigerant evaporator units. System shall be heat recovery type capable of simultaneously heating or cooling different zones at the same time. Chilled water shall be generated via air-cooled chiller(s) meeting the minimum part load IPLV in accordance with Federal Energy Management Program (FEMP) or Energy Star efficiency requirements. Heating system hot water shall be generated via propane fired condensing boilers. Supply air from the DOAS shall be delivered at neutral conditions between 68 to 76 degrees Fahrenheit and have a maximum relative humidity of 50%.

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NOTE: As an option, the dedicated outdoor air system (DOAS) used with the 4-pipe fan coil system, water source heat pump system or variable refrigerant flow system can be provided by a DX packaged or split system unit with a minimum SEER rating in accordance with ASHRAE 90.1 for the DX coil. Supply air from the DOAS shall be delivered at neutral conditions between 68 to 76 degrees Fahrenheit with a maximum relative humidity of 50%.

Consider each HVAC system component relative to its contribution to whole building energy performance and energy costs. HVAC system selection for the building (except for areas excluded above) shall be based on the results of the LCCA performed over a 40 year study period. LCCA shall be in accordance with UFC 1-200-02, High Performance and Sustainable Building Requirements.

LCCA shall be performed using the Building Life Cycle Cost (BLCC) program available from the FEMP website.

Economizer cycles shall not be used.

All outdoor equipment must be located on the plan north side of the building.

Natural gas will be made available for Building 298 at a later date. All equipment that is propane fired shall be provided with a LP to natural gas conversion kit.

GENERAL SYSTEM REQUIREMENTS

Provide working space around all equipment. Provide all required fittings, connections and accessories required for a complete and usable system.

Install all equipment in accordance with the criteria in PTS Section D30 and the manufacturer's recommendations. Where the word "should" is used in manufacturer’s instructions, substitute the word "must".

Provide air conditioning and heating for spaces as indicated and for the following Design conditions:

Outside Conditions

Summer

Degrees F dry bulb

Winter

32.8

Degrees C

-3.3 wet bulb wet bulb

Inside Conditions

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Percent RH

IT Server Rooms Inside Conditions

68 Degrees F

68 Degrees F

20 Degrees C

50 Percent RH

Heating & Ventilating Inside Conditions

Ventilate to maintain a maximum of 10 degrees F above ambient temperatures.

7.2

Minimum air changes per hour

Provide Ventilation rates and systems in accordance with ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality.

Provide ventilation and exhaust for restrooms.

Configure the HVAC system to provide each zone with the choice of heating or cooling year round unless otherwise indicated.

Zone the HVAC system as follows:

Conference Room Telecomm Room Mechanical Room, heated and ventilated only.

Electrical Room, heated and ventilated only.

Office Interior thermostatic control zones must not exceed 2,000 sq.ft. per zone for open office areas or a maximum of four offices per zone for closed office areas.

Perimeter thermostatic control zones shall not exceed 500 sq.ft. and shall be no more than 15 ft from an outdoor wall along a common exposure.

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Provide minimum 4-inch thick concrete housekeeping pads and vibration isolators under all floor-mounted equipment.

For unoccupied mode, provide the following night setback temperatures:

For winter, 10 degrees F (6 degrees C) lower than indoor heating design conditions, but no lower than 55 degrees F (12.8 degrees C).

For summer, 5 degrees F (3 degrees C) higher than indoor cooling design conditions, but no higher than 85 degrees F (29.4 degrees C).

D3010 ENERGY SUPPLY

D301001 PROPANE SUPPLY SYSTEM

Provide a complete propane system to provide above or below ground storage and delivery to the propane fired equipment.

D301002 GAS SUPPLY SYSTEM

Provide a complete propane storage and delivery system to the heating equipment.

D301003 STEAM SUPPLY SYSTEM (FROM CENTRAL PLANT)

Not Used

D301004 HOT WATER SUPPLY SYSTEM (FROM CENTRAL PLANT)

Not Used

D301005 SOLAR ENERGY SUPPLY SYSTEMS

D3020 HEAT GENERATING SYSTEMS

Provide a heating system for this facility consisting of 2 boilers, each providing 60 percent of the load.

Provide shot type feeder for manual chemical feed for closed loop system.

D302001 BOILERS

Provide a packaged propane fired condensing, hot water boilers. Provide pre-manufactured, multi-wall boiler stack.

Provide boiler controls with BACnet communication protocol.

D302002 FURNACES

Not Used

D302003 FUEL-FIRED UNIT HEATERS

Not Used

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D302004 AUXILIARY EQUIPMENT

Not Used

D302005 EQUIPMENT THERMAL INSULATION

Provide insulation for hot water pumps and other associated heating equipment.

D3030 COOLING GENERATING SYSTEMS

D303001 CHILLED WATER SYSTEMS

Provide water system for service to the building HVAC equipment if applicable.

Provide reciprocating, rotary screw, or scroll air-cooled chiller using a variable speed pumping system. Provide a cooling system for this facility consisting of 1 chiller providing 100 percent of the load.

Provide insulation and vapor barrier on all chilled water equipment.

Provide chiller controls with BACnet communication protocol.

Provide complete start-up and operational testing of chiller equipment.

D303002 DIRECT EXPANSION SYSTEMS

Provide a dedicated air-cooled direct expansion (DX) ductless split system heat pump unit for the NMCI/Telecom space.

Provide vertical air handling units (AHU) with ducted air distribution and controls to serve the heating and cooling requirements of the facility.

Provide one vertical AHU unit for each zone and locate within a mechanical closet. The mechanical closet must be lockable and allow adequate space for maintenance. Provide each AHU with a return filter grille to ease maintenance. If space does not allow for a vertical AHU, provide horizontal AHUs in the overhead with a means for removal and maintenance of the system through lockable access panels. Install vibration isolators on heat pumps.

Provide an air cooled variable refrigerant flow (VRF) heating, cooling, ventilating and air conditioning system to serve the requirements of the facility. Design the system to provide the facility with simultaneous heating and cooling with heat recovery. Provide a complete and useable system consisting of VRF heat pump units, branch circuit controllers, VRF fan coil units, and associated controls. Incorporate zone thermostats for control of each fan coil.

VRF system shall be provided with the following criteria:

1. VRF manufacturer must have local support with certified technicians within a 60 mile radius of the owner.

2. The units shall have a manufacturer's extended parts warranty period of ten (10) years from date of start-up.

3. The installing contractor shall be certified by equipment manufacturer.

4. Warranty letter must be provided on VRF manufacturer's letterhead.

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5. Maintenance Tool / LAPTOP COMPUTER - Provide VRF manufacturer’s maintenance tool and dedicated laptop computer appropriate for operating the maintenance tool. Provide ALL passwords and internal keys to give owner FULL access to all VRF systems on-board controls and diagnostics.

6. Equipment start-up, performance tests, and commissioning shall be provided by a factory trained and authorized contractor. Control start-up and commissioning shall be provided by the factory.

7. Forty (40) hours of ONSITE Operation and Maintenance training will be provided to the owner and owner's personnel once commissioning is complete.

Class size shall be able to accommodate ten (10) people. A minimum of two

(2) owner's personnel must complete "Certification" as part of on-site training.

8. Provide an all-expense paid trip for two maintenance personnel to attend the equipment manufacturer’s factory maintenance training program.

9. Provide refrigeration isolation valves at selector box.

D3040 DISTRIBUTION SYSTEMS

D304001 AIR DISTRIBUTION, HEATING & COOLING

Provide insulated, galvanized steel ductwork constructed, braced, reinforced, installed, supported, and sealed in accordance with the IMC and Sheet Metal and Air Conditioning Contractors' National Association (SMACNA) standards.

Provide a Variable Air Volume (VAV) system using ducted returns. Locate VAV units above ceilings and allow for maintenance and removal of units through lockable access panels.

Direct expansion as a heating source for variable air volume systems are not acceptable.

Provide VAV Units.

Provide VAV Fan-Powered Units.

Provide grilles, registers, and diffusers. Provide filter grilles for return air.

D304002 STEAM DISTRIBUTION SYSTEMS

Not Used.

D304003 HOT WATER DISTRIBUTION SYSTEMS

Provide a variable speed pumping system to serve the HVAC hot water equipment throughout the facility. Provide insulated steel or copper hot water supply and return piping to serve the HVAC equipment throughout the facility.

Provide air control and shot type feeder for manual chemical feed for hot water piping system.

Provide an expansion tank for the hot water piping system.

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Provide system flushing and start-up for the hot water piping system.

D304005 GLYCOL DISTRIBUTION SYSTEMS

Not Used.

D304006 CHILLED WATER DISTRIBUTION SYSTEMS

For exterior buried chilled water distribution systems, coordinate with Section G30, Site Civil/Mechanical Utilities.

Provide a variable speed pumping system to serve the HVAC chilled water equipment throughout the facility.

Provide steel or copper chilled water supply and return piping to serve the HVAC equipment throughout the facility. Insulate piping with cellular glass insulation.

Provide air control and shot type feeder for manual chemical feed for the chilled water piping system.

Provide an expansion tank for the chilled water piping system.

Provide system flushing and start-up for the chilled water piping system.

D304007 EXHAUST SYSTEMS

Provide ductwork constructed, braced, reinforced, installed, supported, and sealed in accordance with the IMC and SMACNA standards.

Provide ducted exhaust ventilation systems and exhaust fans to serve all ventilated zones of the facility. Provide in-line, rooftop, or ceiling centrifugal exhaust fans.

D304008 AIR HANDLING UNITS

Provide central station, constant volume, or variable volume air handlers.

Provide with Minimum Efficiency Reporting Value (MERV) 8 filters.

Air handling units shall not be located on the roof.

D304090 OTHER DISTRIBUTION SYSTEMS

Provide base mounted circulating pumps with variable frequency drives.

Provide (2) pumps for each system, sized for 100% of system capacity and operating primary/standby.

D3050 TERMINAL & PACKAGE UNITS

D305002 UNIT HEATERS

Provide unit heaters to serve the heating requirements of the heat and ventilated spaces of the facility. Hot water unit heaters may be used in lieu of electric unit heaters, except in the electrical room.

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D305003 FAN COIL UNITS

Provide 4-pipe vertical type fan coil units and controls to serve the heating and cooling requirements of the facility. Provide one vertical fan coil unit for each zone and locate within a mechanical closet. The mechanical closet must be lockable and allow adequate space for maintenance. Provide each fan coil unit with a return filter grille to ease maintenance requirements. If space does not allow for vertical fan coil units, provide horizontal fan coil units in the overhead with a means for removal and maintenance of the units through lockable access panels.

Provide auxiliary drain pans below valves and appurtenances to prevent piping leaks and condensate forming on chilled water piping from damaging ceilings.

Heating coils within the fan coil units shall be in the reheat position.

D305004 FIN TUBE RADIATORS

Not Used.

D305005 ELECTRIC HEATING

Provide electric or hot water unit heaters for heat and ventilated spaces only.

D305006 PACKAGE UNITS

Provide 100 percent Outside Air Makeup Air Conditioning Units to precondition outside air prior to distributing to fan-coil units and terminal units

D3060 CONTROLS AND INSTRUMENTATION

D306001 HVAC CONTROLS

D306001 1.1 DIRECT DIGITAL CONTROLS (DDC)

The building’s HVAC system will be controlled using Direct Digital Controls (DDC). Re-use the building’s DDC controller, and re-use the existing DDC cabling as much as possible. Modify existing DDC graphics and programming to ensure all new equipment is properly controlled by the base wide Johnson Controls Metasys Extended Architecture system. Ensure equipment nomenclature is correct according to the naming convention preferred by the Facilities Maintenance Department. Ensure all new equipment can be monitored and controlled from the front-end controls server, located in Building 87.

Provide a partial direct digital control (DDC) system to comply with UFGS 23 09 23.13 20 Direct Digital Control Systems for HVAC as modified by Cherry Point. Provide integration of the new DDC to the existing operator workstation and the existing operator workstation software. The existing DDC system was manufactured by Johnson Controls.

Provide ASHRAE Standard 135 building controller as the main interface for the building control system.

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Provide flow rate meters, monitored by the DDC system, for chilled water flow.

Provide air handlers and all terminal units, including VAV boxes, with discharge/supply temperature sensors.

Provide central air handler unit outside air CFM air flow monitoring stations.

Provide a DDC option for automatic operation of building circulating pumps whenever outdoor air temperature is below 35 degrees F or when there is a high potential for freeze damage.

Provide control to automatically start back-up pumps (or other HVAC equipment) if the primary device fails. Primary and back-up equipment starter circuits must be wired to prevent both pieces of equipment from operating at the same time. Rotate primary and back-up HVAC equipment monthly (adjustable) with a lead/lag control routine.

D306001 1.2 ELECTRONIC CONTROLS

Not Used.

D3070 SYSTEMS TESTING AND BALANCING

Provide complete Testing and Balancing (TAB) of all air and water distribution systems and HVAC equipment and performance verification testing (PVT) of all HVAC controls systems.

D307003 HVAC COMMISSIONING

Refer to RFP Part 3 - Project Program, Chapter 2 for Building Commissioning requirements. Mechanical systems to be commissioned, if provided, include HVAC systems and controls, refrigeration systems and controls, and domestic hot water systems.

D3090 OTHER HVAC SYSTEMS AND EQUIPMENT

D309001 GENERAL CONSTRUCTION ITEMS

Not Used.

D309090 OTHER SPECIAL MECHANICAL SYSTEMS

Provide total energy (enthalpy) type energy recovery wheels (heat wheels) in the air handling system.

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