6_ESR_D30.pdf

P-909 SOF SDVT2 Operations Support Facility Work Order Number: 1704761 JEB Little Creek, VA

PART 3 - CHAPTER 6 / ESR D30 - Page 1

6. ENGINEERING SYSTEMS REQUIREMENTS

D30 HVAC

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

SYSTEM DESCRIPTION

Provide an HVAC system that attains the following objectives: Occupant comfort, Indoor air quality, Acceptable noise levels, Energy efficiency, Reliable operation, and Ease of maintenance. Refer to Space Tabulations Section of the Project Program for building occupancy levels.

Provide a Variable Air Volume (VAV) system including single duct air terminal units (i.e. non-fan powered boxes) with hot water heating coils. The VAV Air Handling Unit (AHU) must include a total enthalpy energy recovery device and an air economizer. Chilled water must be provided by air-cooled chillers with optional heat recovery capability. The chilled water system must include variable primary pumping. Heating hot water must be provided by two natural gas fired boilers. The heating hot water system must include primary/secondary pumping.

Equipment must be sized assuming a 50% efficient total enthalpy energy recovery device in order to account for loss of efficiency over time.

Natural gas is available near the site. See section G30 for location and details.

Provide NEMA premium highest efficiency motors, chillers, and boilers and optimize the HVAC system in accordance with NEMA MG-11 Table 12-10.

UMCS: Connect to Installation Utility Monitoring Control System (UMCS) VA Little Creek Approved CJ&A DDC Exp20241031.

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".

The HVAC system must meet the required design conditions in the following tables. Coordinate with the Government to ensure the HVAC system meets approved temperature setpoints, adjustable by occupants.

Outside Conditions

Summer

Degrees F dry bulb

Winter

Degrees F

Degrees F wet

PART 3 - CHAPTER 6 / ESR D30 - Page 2

Indoor Design Conditions

Occupant Comfort (OC)

Percent RH

Equipment Protection (EP)

Percent RH

Heating & Ventilating Only (HV)

80 Degrees F dry

Provide Ventilation rates and systems in accordance with ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality. Provide demand-controlled ventilation (DCV).

Configure the HVAC system to provide each zone with the choice of heating or cooling year round unless otherwise indicated. Provide each zone with its own limited range of control, as allowed by the control system central workstation.

Provide dedicated systems as indicated on room requirements.

The secured annex area must be a separate air handling unit zone.

Provide minimum 4-inch (100 mm) thick concrete housekeeping pads and vibration isolators under all floor-mounted equipment.

Provide factory painted finishes that are designed for 3000-hour duration test for outside equipment and for equipment bringing in outside air.

Provide corrosion resistant coatings or materials for any exterior air-conditioning (including heating and ventilating) equipment and equipment handling outside air that is to be installed. This includes any coils exposed to outside air. The heat transfer rating must be as installed.

For unoccupied mode, provide the following night setback temperatures:

For winter, 10 degrees F lower than indoor heating design conditions, but no lower than 55 degrees F.

For summer, 5 degrees F higher than indoor cooling design conditions, but no higher than 85 degrees

PART 3 - CHAPTER 6 / ESR D30 - Page 3

F.

D3010 ENERGY SUPPLY

D301001 OIL SUPPLY SYSTEM

Not used.

D301002 GAS SUPPLY SYSTEM

Obtain natural gas pressures from the local natural gas utility provider. Provide any applications and permits and provide the complete natural gas system from the load side of the utility meter to the heating equipment. Contract with the local natural gas utility provider for installation of piping and appurtenances up to the load side of the meter. Provide gas meter on the building main and tie meter into the Building Automation System (BAS).

D301003 STEAM SUPPLY SYSTEM (FROM CENTRAL PLANT)

Do not provide steam equipment except to facilitate demolition of existing steam piping.

D301004 HOT WATER SUPPLY SYSTEM (FROM CENTRAL PLANT)

Not used.

D301005 SOLAR ENERGY SUPPLY SYSTEMS

Not used.

D3020 HEAT GENERATING SYSTEMS

D302001 BOILERS

Provide 93% (minimum) high efficiency condensing boilers. Return Water Temperature must operate at or below 120F.

Provide pre-manufactured, stainless steel, multi-wall insulated boiler stack. The stack must be pre-engineered, pre-manufactured, UL listed, and must meet NFPA 211. Boilers must be forced draft fired. Fuel for boilers must be natural gas. Condensing type boilers must be provided with a condensate neutralization tank/kit. Provide each boiler with minimum of 60% capacity of the total load, not to exceed 399 MBH per boiler.

All vents on gas control valves must be routed outdoors as required by NFPA 54. All gas lines serving gas-fired equipment must be fitted with U.L. or Factory Mutual (F.M.) approved gas trains suitable for the gas being provided. Refer to 3.0 Site Analysis, Paragraph 3.2.18 Permits, for Air Emission Permits. Air Emission permit is required for each combustion device provided.

Provide boiler controls in compliance with ASHRAE 135 BACnet - A Data Communication Protocol for Building Automation and Control Networks.

D302002 FURNACES

PART 3 - CHAPTER 6 / ESR D30 - Page 4

Not used.

D302003 FUEL-FIRED UNIT HEATERS

Not used.

D302004 AUXILIARY EQUIPMENT

Not used.

D302005 EQUIPMENT THERMAL INSULATION

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

D3030 COOLING GENERATING SYSTEMS

Do not provide microchannel coils for any heat exchanger utilizing refrigerant or water, including but not limited to evaporators and condensing units.

D303001 CHILLED WATER SYSTEMS

The cooling load for each facility must be served by two chillers providing approximately 75% of the load each. The chillers must be on a lead/ lag controls set up. Provide 100% stand-by pumps for all chillers/ chiller plant. The air-cooled chiller(s) must be located outside on a 150 mm (6 inch) minimum thick reinforced concrete housekeeping pad. Provide heat tape for freeze protection of chilled water piping and any other associated appurtenances.

Total chilled water system volume must be a minimum of 7 gallons per ton of cooling. Provide an insulated storage tank within the mechanical room in order to meet this requirement, if needed.

Provide thermal mass capability in the chilled water system to ensure proper control and longevity of chillers, e.g. by using inertia tanks.

Provide each chiller with low ambient operation capability.

Provide factory corrosion protection coating on coils where 50 percent or more of the airflow is outside air. These coils must meet or exceed the requirements of a 3000- hour salt spray test and requirement and provide a minimum of loss of heat transfer due to the thickness of the coating. Test shall be in accordance with ASTM B117.

Provide heat tracing for chiller bundles and all above-ground equipment and piping that are subject to freezing.

Provide insulation and vapor barrier on all chilled water equipment. Insulate pipe with cellular glass.

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

Provide temporary chiller connections on the supply and return piping with isolation valves.

Provide air vents at all terminal equipment and system high points.

Provide chemical treatment equipment for the chilled water piping system.

Provide approved quantity, size, spacing, material, and height of bollards around all yard equipment

PART 3 - CHAPTER 6 / ESR D30 - Page 5 including the Air Compressors, Chilled Water System chillers, and Natural Gas metering.

Provide chiller controls in compliance with ASHRAE 135 BACnet - A Data Communication Protocol for Building Automation and Control Networks. Provide all gateways as needed.

D303002 DIRECT EXPANSION SYSTEMS

The Telecommunications/Data/NMCI room must be served by a dedicated direct expansion (DX) ductless split system air conditioning unit for the NMCI/Telecom space per UFC 3-580-10. Each elevator equipment room must be served by a dedicated direct expansion (DX) ductless split system air conditioning unit per UFC 3-490-06. Provide coil coatings that pass a salt-spray test conducted per ASTM B117 for duration of 3000 hours. Provide a wall mounted adjustable Thermostat.

Provide temperature sensor and current sensor to building DDC to monitor space temperature and unit operation if system cannot be tied directly to the DDC (BACnet compatible).

D3040 DISTRIBUTION SYSTEMS

Do not route piping above electrical equipment rooms, to ensure that electrical equipment is protected from fluid falling off piping in the future.

D304001 AIR DISTRIBUTION, HEATING & COOLING

Provide insulated, galvanized steel ductwork constructed, braced, reinforced, installed, supported, and sealed per the IMC and SMACNA standards. Provide double wall pre-insulated ductwork with solid inner wall for any supply and return ductwork located in occupied rooms for an aesthetically pleasing finished look. Paintable external, rigid mineral fiber insulation is acceptable for exposed ductwork requiring insulation located in unoccupied rooms. Provide air volume balance dampers in all branch ducts and on the low-pressure side of the VAV system after the VAV terminal units. All air volume balance dampers must be accessible. If air volume balance dampers are located above hard ceilings (i.e., plaster, etc.), provide lockable access panels to allow adjustment of dampers.

Provide round or flat oval duct for VAV primary air distribution per UFC 3-410-01 paragraph 3-6.10.

Rectangular duct must transition to round or flat oval as soon as space allows.

Provide aluminum grilles, registers, and diffusers.

Locate air filters for ease of maintenance and minimal disturbance to occupied spaces, in coordination with Government Operations and Maintenance (O&M) personnel serving the project site and occupant representatives.

Do not route ductwork above electrical equipment rooms, to ensure that electrical equipment is protected from condensate falling off ductwork in the future.

D304002 STEAM DISTRIBUTION SYSTEMS

Do not provide steam equipment except to facilitate demolition of existing steam piping.

D304003 HOT WATER DISTRIBUTION SYSTEMS

For exterior buried Hot Water Distribution Systems see Section G30, Site Civil/Mechanical Utilities.

Provide a primary/secondary pumping system to serve the HVAC hot water equipment throughout the

PART 3 - CHAPTER 6 / ESR D30 - Page 6 facility. Provide two circulation pumps (one standby) on the secondary part of the system with variable frequency drives. The hot water distribution system must be configured in a reverse return piping arrangement. Provide insulated steel or copper hot water supply and return piping to serve the HVAC equipment throughout the facility. Insulate piping with mineral fiber insulation. Provide a bladder type expansion tank with automatic air relief valve for the hot water piping system.

Provide base-mounted hot water pumps in equipment rooms.

Provide valves and related hot water system appurtenances. Provide isolation valves for all equipment. "Triple duty" or "multi- purpose" valves, which combine a check valve, throttling valve, and shut-off valve, must not be used for hot water systems. No triple duty or automatic flow devices are allowed.

Provide chemical treatment equipment for hot water piping system.

Provide system flushing and complete start-up and operational testing of the hot water piping system.

Provide air vents and isolation valves at all terminal equipment and system high points.

D304005 GLYCOL DISTRIBUTION SYSTEMS

Not used.

D304006 CHILLED WATER DISTRIBUTION SYSTEMS

Provide a variable primary system with standby pump to serve the HVAC chilled water equipment throughout the facility.

Provide air vents at all terminal equipment and system high points for air control and chemical treatment equipment for the chilled water piping system.

Provide a bladder type expansion tank with automatic air relief valve for the chilled water piping system.

Provide chemical treatment of chilled water.

Provide steel or copper chilled water supply and return piping to serve the HVAC equipment throughout the facility. Insulate piping with cellular glass insulation on all above-ground chilled water distribution piping. Exterior piping must be weatherproof.

For piping exposed to outdoor ambient temperatures, provide heat tape to ensure freeze protection down to 10 degrees F.

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

Provide complete start-up and operational testing of all chilled water systems.

Provide valves and related chilled water system appurtenances. Provide isolation valves for all equipment. "Triple duty" or "multi- purpose" valves, which combine a check valve, throttling valve, and shut-off valve must not be used for chilled water systems. Automatic flow control valves are not permitted.

Provide air vents and isolation valves at all terminal equipment and system high points.

PART 3 - CHAPTER 6 / ESR D30 - Page 7

D304007 EXHAUST SYSTEMS

Provide ductwork constructed, braced, reinforced, installed, supported, and sealed per the IMC and SMACNA standards.

Provide ducted exhaust ventilation systems and exhaust fans to serve all ventilated zones of the facility.

D304008 AIR HANDLING UNITS

Air handling systems must consist of filters, ahead of hot water preheat coils and chilled water cooling coils.

Variable frequency drive controlled supply fans are required.

Outside ventilation air and exhaust air must both be filtered upstream of where the air enters the total enthalpy energy recovery device.

D304090 OTHER DISTRIBUTION SYSTEMS

Not used.

D3050 TERMINAL & PACKAGE UNITS

D305002 UNIT HEATERS

Provide unit heaters to serve the heating requirements of the equipment rooms and to protect plumbing fixtures and piping in ventilated areas of the facility from freezing.

D305003 FAN COIL UNITS

Not used.

D305005 ELECTRIC HEATING

Not used.

D305006 PACKAGE UNITS

Not used.

D3060 CONTROLS AND INSTRUMENTATION

D306001 HVAC CONTROLS

D306001 1.1 DIRECT DIGITAL CONTROLS (DDC)

Provide a complete Direct Digital Control (DDC) system to comply with UFGS 23 09 00 Instrumentation and Control for HVAC, UFGS 23 09 23.02 BACnet Direct Digital Control Systems for HVAC and Other Building Control Systems, UFGS 23 09 13 Instrumentation and Control Devices for HVAC and BACnet communication protocol for the facility.

PART 3 - CHAPTER 6 / ESR D30 - Page 8

Provide complete application software with all licenses.

Provide meters, monitored by DDC, on the following incoming utilities of the building: natural gas.

Tie the gas meter into the existing Advanced Metering Infrastructure (AMI) system.

For electrical energy monitoring, refer to Section D50, Electrical, paragraph entitled, Service Entrance Equipment.

For potable water meter, refer to Section G30, Site Civil/Mechanical Utilities, paragraph entitled, Potable Water Distribution.

For meter of potable water subsystem used for total irrigated landscape area with controller, refer to Section G20, Site Improvements, paragraph entitled, Irrigation Systems.

Provide integration of the new DDC to the existing operator workstation and the existing operator workstation software. The existing operator workstation and the existing DDC system server are located in building 3165. The existing DDC system was manufactured by ALC. Refer to Part 6 maps.

Comply with all applicable cybersecurity requirements. Per UFC 4-010-06 Cybersecurity of Facility- Related Control Systems (19 September 2016, Change 1, 18 January 2017), 2-2 5-Level Control System Architecture, provide a control system architecture level of 4, minimum - CS Front End and CS IP Network.

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

Set up trend reports to record data daily and store values in the operator workstation DDC computer and in the ASHRAE Standard 135 building controller for later retrieval.

Provide on-site DDC interface for a Government operator to facilitate O&M. Provide patch panel in mechanical equipment rooms for ease of connection to equipment.

Provide DDC panels with locks and alarms. The alarms must include both a flashing light and an audible alarm inside the mechanical room. Each alarm must also be a networked alarm (e.g. switch connected to controller DI); alarm events must be recorded remotely for a period not less than one year.

Provide air handling units and all VAV boxes with discharge/supply temperature sensors.

Provide air handling units with airflow monitoring stations to measure outside air CFM.

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

Provide controls to automatically start a back-up pump (or other HVAC equipment) if a 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

Provide electronic controls with programmable thermostats for the HVAC systems and equipment.

PART 3 - CHAPTER 6 / ESR D30 - Page 9

D3070 SYSTEMS TESTING AND BALANCING

Provide complete Testing and Balancing (TAB) of all air and water distribution systems and HVAC equipment.

Provide performance verification testing (PVT) of all HVAC control systems.

D307003 HVAC COMMISSIONING

Refer to RFP Part 3 - Project Program, Chapter 2 for Building Commissioning requirements.

D3090 OTHER HVAC SYSTEMS AND EQUIPMENT

D309001 GENERAL CONSTRUCTION ITEMS

Provide seismic restraints and comply with the Force Protection Criteria. Overhead mounted features weighing 31 pounds or more must meet Antiterrorism requirements indicated in UFC 4-010- 01.

Provide access to all equipment rooms through the building exterior walls. Equipment rooms should be located on the ground floor. If an equipment room is not on the ground floor, provide through the wall access doors on building exterior with removable handrails for crane access.

D309090 OTHER SPECIAL MECHANICAL SYSTEMS

Provide total enthalpy energy recovery device in each air handling unit for recovering energy between the outgoing exhaust air and the incoming ventilation air. The total enthalpy energy recovery device must be located at the AHU and easily accessible for maintenance.

Provide a separate isolated exhaust system for each battery room. Provide a dedicated system that supplies 100% outside air for each battery room. Each battery room must be negatively pressurized relative to adjacent spaces. The requirement for total enthalpy energy recovery in D30 GENERAL REQUIREMENTS does not apply to this air handling unit.

Provide industrial high-capacity dehumidifiers, selected and sized through coordination with manufacturer for each application. Dehumidifier must be capable of removing up to 4.2 liters per kilowatt-hour and moving up to 500 CFM of air. Dehumidifier must include built-in digital controls that display measured humidity, humidity setting, and fan setting. Controls must allow user to adjust humidity setting down to 25% relative humidity. Provide complete and useable dehumidifier, including but not limited to MERV 11 washable filter, drain connection, drain tube, manufacturer’s condensate pump, floor drain, and electrical connection. Dehumidifier required power must be 120 volts, single phase. Provide manufacturer’s 5-year warranty.

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