NAVFAC Design-Build Model Request for Proposal - Test
D30 HVAC
SYSTEMS REQUIREMENTS
HVAC TEMPLATE 12/08
Instructions for using this template: There are template files for each UNIFORMAT Level 2 Group Elements. This template is for Group Element D30-HVAC. Text such as this is hidden text that will not print when the hidden text box in "Print/Options" is un-checked.
The Mechanical Team Member should edit this template for the requirements of the project. The SYSTEMS REQUIREMENTS are intended to define items that are required throughout the facility or on a system wide basis that is common to several rooms. Room-specific requirements are defined in the ROOM REQUIREMENTS section. Coordinate with the lead programmer for ROOM REQUIREMENTS. Editing is required where brackets [] appear. Delete all building elements that are not required for the project. If additional elements or sub-elements are required for the project that do not appear in the template, refer to the NIST UNIFORMAT II publication for additional building element numbers and descriptions. The Uniformat II Work Breakdown Structure can be found at www.wbdg.org/ndbm/. Coordinate with the PERFORMANCE SPECIFICATION SECTION D30 to ensure that performance requirements are provided for all of the Building Elements listed here and that paragraph numbering matches.
Refer to Part 4 Section D30 for performance requirements of the building elements included in the HVAC system.
SYSTEM DESCRIPTION
NOTE: Edit the following for the specific project requirements. Remember to let the design build A/E design the project. Keep the requirements general wherever possible. If it is covered by the building code or PTS Section D30, it does not need to be restated in this section.
Mechanical system selection shall comply with base/activity requirements and shall be life cycle cost effective relative to other systems studied. RFP editor shall partner with the Public Works Department on life cycle suitability of mechanical systems, along with system Operational, Maintenance, and Support Information (OMSI) requirements. Consider mechanical systems common to the Public Works Department in an effort to reduce associated maintenance costs. Consider mechanical systems that gain a high number of LEED credits. Consider HVAC energy saving strategies for the purpose of maximizing LEED credits (ie. VFD's. VAV's, Supply Air Temperature Reset, Demand Controlled Ventilation, etc.).
The RFP editor shall confirm system requirements with PWD and identify the appropriate system in the paragraph below. Select one of the three systems listed in this note unless PWD cannot support maintenance of the choice. Delete systems and components in the ESR text that are not used.
- 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 IPLV in accordance with ASHRAE 90.1-2004. Heating system hot water shall be generated via central steam or propane/natural gas/oil fired 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%.
- 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 IPLV in accordance with ASHRAE 90.1-2004. Heating system hot water shall be generated via central steam or propane/natural gas/oil fired boilers.
- Water source heat pumps with a dedicated outdoor air system (DOAS). Water source heat pumps shall meet the minimum COP in accordance with ASHRAE 90.1-2004. Consider ground-coupled systems verse closed loop systems with a closed-circuit cooler and a supplemental loop heating system. The supplemental loop heating system shall be generated via central steam or propane/natural gas/oil fired boilers. Dedicated outdoor air system shall be provided with chilled and hot water coils where the chilled and hot water is generated via water source heat pumps. 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%.
NOTE: As an option, the dedicated outdoor air system (DOAS) used with the 4-pipe fan coil or water source heat pump system can be provided by a direct expansion (DX) packaged or split system unit with a minimum SEER of 14.0 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%.
NOTE: Model RFP has been pre-edited for the three system choices above. If a different system is required, add technical requirements to Parts 3 and 4. Delete systems and components in the ESR text that are not used.
Provide a [4-pipe fan coil] [VAV] [water source heat pump] [____] heating, ventilating and air conditioning (HVAC) system for the [ ] that attains the following objectives: Occupant comfort, Indoor air quality, Acceptable noise levels, Energy efficiency, Reliable operation, and Ease of maintenance. Design and installation shall be in accordance with IMC and UFC 3-400-10N, 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.]
NOTE: Revise the following as required to identify system choices that should not be used for this facility. Consider deleting the prohibition on direct expansion VAV systems for applications in the 5,000 to 10,000 square foot (464.5 to 929 square meter) range. Consider deleting the prohibition on thru-the-wall units in BEQ's, and isolated offices. Use of thru-the-wall units (GE Zoneline) is generally required in Navy Lodges. Economizers are not allowed in humid areas and shall only be provided in accordance with ASHRAE guidelines and standards for the recommended weather zones.
[Economizer cycles shall not be used.]
GENERAL SYSTEM REQUIREMENTS
Provide working space around all equipment. Provide all required fittings, connections and accessories required for a complete and usable system. All equipment shall be installed per the criteria in PTS Section D30 and the manufacturer's recommendations. Where the word "should" is used in manufacturer’s instructions, substitute the word "shall".
Provide air conditioning and heating for spaces as indicated and for the following Design conditions:
| Outside Conditions | |||||
|---|---|---|---|---|---|
| Summer | [ ] | Degrees F dry bulb | Winter | [ ] | Degrees F |
| [ ] | Degrees C dry bulb | [ ] | Degrees C | ||
| [ ] | Degrees F wet bulb | ||||
| [ ] | Degrees C wet bulb |
| Inside Conditions | |||||
|---|---|---|---|---|---|
| Summer | 75 | Degrees F dry bulb | Winter | 68 | Degrees F |
| 23.8 | Degrees C dry bulb | 20 | Degrees C | ||
| 50 | %RH |
| [Special Areas] Inside Conditions | |||||
|---|---|---|---|---|---|
| Summer | [ ] | Degrees F dry bulb | Winter | [ ] | Degrees F |
| [ ] | Degrees C dry bulb | [ ] | Degrees C | ||
| [ ] | %RH |
| Heating & Ventilating Inside Conditions | |||||
|---|---|---|---|---|---|
| Summer | [ ] | Degrees F dry bulb | Winter | [ ] | Degrees F |
| [ ] | Degrees C dry bulb | [ ] | Degrees C | ||
| [ ] | [Air changes per hour] |
Provide Ventilation rates and systems per the latest edition of ASHRAE Standard 62.1, Ventilation for Acceptable Indoor Air Quality.
NOTE: Ventilation shall be provided in accordance with UFC 3 400-10N. Consider providing demand controlled ventilation via CO2 sensors were applicable such as Dining Facilities, Multi-purpose rooms, or other areas of highly diverse occupancies.
[Provide ventilation for [ ].]
[The HVAC system shall provide each zone with the choice of heating or cooling year round unless otherwise indicated.] [Each zone shall have its own limited range of control, as allowed by the control system central workstation.]
NOTE: Where necessary, detail zoning requirements. Coordinate with the project architect for functional requirements of the facility spaces. Clearly indicate which zones are to be heated and ventilated only vs. heated and cooled. Also indicate which spaces can be grouped into zones.
[Zone the HVAC system as follows:
[ ] shall be a separate zone.
[ ] shall be a separate zone, heated and ventilated only.
[ ] shall be a separate zone, ventilated only.]
Provide minimum 4-inch (100 mm) thick concrete housekeeping pads and vibration isolators under all floor-mounted equipment.
[All mechanical equipment shall have painted finishes that pass a salt-spray test conducted per ASTM B117 for duration of at least 500 hours.]
NOTE: Consider requiring all outside HVAC cooling/heating and condenser coils be provided with protective coatings when locations are within 5 miles of the ocean or exposed to corrosive environments.
[All outside mechanical equipment HVAC [cooling/heating] [and] [condenser] coils shall be provided with a manufacturer approved coating system. The heat transfer rating shall be as installed.]
D3010 ENERGY SUPPLY
NOTE: Edit the following to indicate the required use of a particular energy source (other than electricity) such as natural gas or a central steam or hot water distribution system where applicable. Coordinate with Section G30.
D301001 OIL SUPPLY SYSTEM
Provide a [complete] oil system to provide [above] [below] ground storage and delivery to the oil fired equipment.
D301002 GAS SUPPLY SYSTEM
NOTE: Coordinate with and Insert name of utility company.
[Obtain natural gas pressures from the local natural gas utility provider, [_____]. Contractor is responsible for providing any applications and permits and shall provide the complete natural gas system from the load side of the utility meter to the heating equipment. The Contractor shall have the local natural gas utility provider install piping and appurtenances up to the load side of the meter.]
[Provide a complete propane storage and delivery system to the heating equipment.]
D301003 STEAM SUPPLY SYSTEM (FROM CENTRAL PLANT)
Refer to Section G30, Site Civil/Mechanical Utilities.
[An existing central steam distribution system shall be the source of heating for the facility. Provide extension and connection to the existing Base steam system. Provide [[aboveground] [below ground] piping] [concrete trench] system including [manholes] [supports].]
D301004 HOT WATER SUPPLY SYSTEM (FROM CENTRAL PLANT)
Refer to Section G30, Site Civil/Mechanical Utilities.
[An existing central hot water distribution system shall be the source of heating for the facility. Provide extension and connection to the existing Base heating system. Provide [[aboveground] [below ground] piping] [concrete trench] system including [manholes] [supports].]
D3020 HEAT GENERATING SYSTEMS
NOTE: Check with the Base PWC to see if there has been a previous study or a maintenance preference for boiler type.
The heating load for this facility shall be served by [1] [2] boilers providing [100] [60] % of the load.
[Boiler(s) located outside are acceptable.]
D302001 BOILERS
NOTE: Check with the Base PWD to see if there has been a previous study or a maintenance preference for boiler type. Consider packaged gas fired condensing boilers when natural gas or propane is available for the purpose of gaining maximum efficiency and LEED credits.
Provide a [cast iron sectional], [flexible], [steel [] [firebox]], [modified scotch marine], [packaged steel ], [packaged gas fired condensing], [or] [finned tube] [hot water] [steam] boiler[s]. [Provide boiler feed system.] Provide pre-manufactured, multi-wall boiler stack.
D302002 FURNACES
Provide [gas] [oil]-fired [condensing] furnace[s] [with cooling coil].
D302003 FUEL-FIRED UNIT HEATERS
Provide [gas-fired unit heaters] [[condensing] [non-condensing], [direct-fired] [indirect-fired] infrared heaters].
D302004 AUXILIARY EQUIPMENT
[Provide steam to hot water converter(s) for this facility, using the Base central steam system to generate hot water for the HVAC system.]
[Provide steam to hot water heat exchanger for the [ ].]
[Provide condensate return unit[s].]
D302005 EQUIPMENT THERMAL INSULATION
Provide insulation for steam system equipment, steam to hot water converters, hot water pumps and other associated heating equipment.
D3030 COOLING GENERATING SYSTEMS
D303001 CHILLED WATER SYSTEMS
NOTE: The following paragraphs should be used to identify the type of chilled water system. Delete the following paragraph if not expanding an existing system.
NOTE: Specify the type and number of chillers to be provided. If multiple chillers are provided, require chiller manufacturer to provide a central chiller control panel. Coordinate with the PW department for preference on number of chillers or back-up required.
Provide [connection to and extension of the existing central] chilled water system for service to the building HVAC equipment. [The existing chilled water system provides chilled water at [45] [_] degrees F ([7] [__] degrees C). [Chilled water reset is not allowed.] The existing system utilizes [2-way] [3-way] control valves.] [Provide glycol/water mix for protection down to [ ] degrees F.]
Provide [[centrifugal] [rotary screw] water-cooled] [[reciprocating] [rotary screw] [scroll] air-cooled] chiller[s] using a [variable primary] [primary/secondary] [variable speed] pumping system [and [cooling tower] [closed circuit cooler]. The cooling load for this facility shall be served by [1] [2] chiller[s] providing [100] [50] % of the load.
NOTE: 40 degrees F is typically standard, 20 degrees F, 0 degrees F, or –20 degrees F (special) are optional. Consult FEC office for guidance.
[Chiller(s) shall operate in temperatures down to [ ] degrees F.
[Provide heat recovery for [reheat] [domestic hot water].
Provide insulation and vapor barrier on all chilled water equipment.
Provide complete start-up and operational testing of chiller equipment.
Provide factory assembled [galvanized steel with stainless steel basin] [stainless steel] [fiberglass] [cooling tower(s)] [closed circuit cooler(s)] to serve the water-cooled chillers. [Provide with basin heater(s).] [The load may be served by a single cooling tower.] [The load shall be served by [2] cooling towers, each serving [50%] of the load.].
D303002 DIRECT EXPANSION SYSTEMS
NOTE: This paragraph is intended for light commercial equipment. See paragraph D305006 for requirements for PTACs and small split systems and coordinate
[Provide a dedicated air-cooled direct expansion (DX) ductless split system [cooling only] [heat pump] unit for the NMCI/Telecom space.]
NOTE: Water source heat pumps are one of the 3 recommended system options. Delete water source heat pumps if not used.
[Provide vertical [water source] [ground-coupled] heat pump units with ducted air distribution and controls to serve the heating and cooling requirements of the facility. One vertical [water source] [ground-coupled] heat pump unit shall be provided for each zone and shall be located within a mechanical closet. The mechanical closet shall be lockable and allow adequate space for maintenance. Provide each [water source] [ground-coupled] heat pump with a return filter grille to ease maintenance. If space does not allow for a vertical heat pump unit, provide horizontal heat pump units in the overhead with a means for removal and maintenance of the system through lockable access panels. Install flexible stainless steel piping connections (hose kits) between {water source] [ground-coupled] heat pumps and piping. Install vibration isolators on heat pumps. [Provide heat pumps with supplemental electric heaters.] [Provide heat pumps with desuperheaters and tanks for domestic water.]]
D3040 DISTRIBUTION SYSTEMS
D304001 AIR DISTRIBUTION, HEATING & COOLING
NOTE: Ductwork location should also be addressed in this paragraph if requirements are critical (must be concealed, can be exposed, etc.)
Provide [insulated, galvanized steel] [double wall, preinsulated] ductwork constructed, braced, reinforced, installed, supported, and sealed per the IMC and SMACNA standards.
NOTE: Variable air volume systems are one of the 3 recommended system options. Delete VAV system if not used.
[Provide a Variable Air Volume (VAV) system using ducted returns [and sound attenuators]. VAV units shall be located above ceilings and allow for maintenance and removal of units through lockable access panels.]
NOTE: Verify that Activity does not have a restriction on the use of Fan-powered VAV boxes due to increase maintenance of the box fans and filters.
[Direct expansion 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.] [Provide linear slot diffusers including boot.]
D304002 STEAM DISTRIBUTION SYSTEMS
For Exterior Buried Steam systems, see Section G30.
Provide insulated, steel steam and condensate piping to serve the HVAC equipment throughout the facility.
D304003 HOT WATER DISTRIBUTION SYSTEMS
NOTE: Consider providing hydronic floor radiant heating systems in maintenance bays, hangar bays, and child development center infant, toddler, and preschool areas, for climate zones 3 through 8. Recommend insulating under floor slab of hydronic radiant heating system with R-10 insulation for weather zones 3 through 8, and R-15 insulation for climate zone 8.
For exterior buried Hot Water Distribution Systems see Section G30.
Provide a variable speed pumping system to serve the HVAC hot water equipment throughout the facility. Provide insulated [steel][copper] hot water supply and return piping to serve the HVAC equipment throughout the facility.
Provide air control and chemical treatment equipment for hot water piping system.
Provide an expansion tank for the hot water piping system.
Provide system flushing and start-up for the hot water piping system.
D304004 CHANGEOVER DISTRIBUTION SYSTEMS
[Provide as specified for Hot Water Distribution Systems see D304003.]
D304005 GLYCOL DISTRIBUTION SYSTEMS
[Provide as specified for Chilled Water Distribution Systems see D304006.]
D304006 CHILLED WATER DISTRIBUTION SYSTEMS
[For exterior buried chilled water distribution systems, coordinate with Section G30.]
Provide a [variable primary] [primary/secondary] [variable speed] pumping system to serve the HVAC chilled water equipment throughout the facility.
NOTE: Coordinate with the PW department for preference on type of insulation required.
Provide [steel][copper] chilled water supply and return piping to serve the HVAC equipment throughout the facility. Insulate piping with [cellular glass] [polyisocyanurate] insulation.
Provide air control and chemical treatment equipment 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 per 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] [ceiling] centrifugal exhaust fan[s].
D304008 AIR HANDLING UNITS
Provide [central station] [constant volume] [variable volume] air handlers. Provide with [35] [50] [85] [95]% filters.
NOTE: Consideration should be given to the use of UV based on the activities ability to maintain the equipment, since it enhances the equipment life and minimizes coil cleaning. Also this will help avoid IAQ problems.
[Provide with ultraviolet disinfection system.]
D304090 OTHER DISTRIBUTION SYSTEMS
Provide [in-line] [base mounted] circulating pumps [with variable frequency drives].
D3050 TERMINAL & PACKAGE UNITS
D305002 UNIT HEATERS
[Provide [cabinet] [unit] heaters to serve the heating requirements of [ ] area of the facility.]
[Provide gas-fired infrared heaters to serve the heating requirements of [ ] area of the facility.]
D305003 FAN COIL UNITS
NOTE: Fan coil units are one of the 3 recommended system options. Delete fan coil units if not used.
[[Provide 4-pipe vertical type fan coil units and controls to serve the heating and cooling requirements of the facility. One vertical fan coil unit shall be provided for each zone and shall be located within a mechanical closet. The mechanical closet shall 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.]
[D305004 FIN TUBE RADIATORS] [CONVECTORS]
[Provide [fin tube radiators] [convectors] for heating [ ] spaces.]
D305005 ELECTRIC HEATING
[Provide electric [unit heaters] [baseboard] [wall] [infrared] heaters for heating [ ] spaces.]
D305006 PACKAGE UNITS
[Provide 100% Outside Air Makeup Air Conditioning Units to precondition outside air prior to distributing to [central station air handling] [fan-coil units][terminal units].]
D3060 CONTROLS AND INSTRUMENTATION
NOTE: Where the Engineering Field Division, Engineering Field Activity, Station, or Command has an Approved Justification and Authorization (J & A) document allowing the use of a single Direct Digital Controls provider; and where all previous J & A bid experiences have indicated that bid pricing remains reasonable and competitive; then use the second bracketed sentence. In other cases, use the first bracketed sentence. For small DX systems, delete this section in its entirety and include a short write-up describing the desired control scenario.
D306001 HVAC CONTROLS
D306001 1.1 DIRECT DIGITAL CONTROLS (DDC)
NOTE: Additions to existing building DDC systems may provide an adequate reason to support a J & A for extending a single manufacturer's system; however, it is possible that another manufacturer's product could be more cost effectively retrofitted to the entire building rather than extend the existing system with repair parts for an otherwise obsolete system. Where the Contracting Officer has an Approved Justification and Authorization (J & A) document [B1]: select the second bracketed option and indicate the required make/model and DDC system manufacturer.
[Provide a complete Direct Digital Control (DDC) system for the facility.]
[Provide a partial direct digital control (DDC) system which will communicate with the existing DDC system. The existing DDC system was manufactured by [_______].] [The DDC system shall be (make/model).] [The system shall utilize electronic equipment controllers.]
D306002 ELECTRONIC CONTROLS
[Provide electronic controls for the HVAC systems and equipment.]
D3070 SYSTEMS TESTING AND BALANCING
NOTE: Where the project is complex, or mission essential, or has life safety issues, or due to local construction conditions, provide additional wording as necessary
[Provide complete Testing and Balancing (TAB) of all air and water distribution systems and HVAC equipment.]
D307003 HVAC COMMISSIONING
NOTE: Extent of Commissioning will depend on the scope and complexity of the project.
Refer to Project Program section 2.3.3 for Building Commissioning requirements. Mechanical systems to be commissioned, if provided, include HVAC systems and controls, refrigeration systems and controls, renewable energy systems, [_______,] and domestic hot water systems.
D3090 OTHER HVAC SYSTEMS AND EQUIPMENT
D309001 GENERAL CONSTRUCTION ITEMS
NOTE: Coordinate seismic requirements in Project Program or elsewhere in RFP.
[Provide seismic restraints] [and] Comply with the Force Protection Criteria.
D309090 OTHER SPECIAL MECHANICAL SYSTEMS
[Provide industrial ventilation system in accordance with UFC 3-400-10N.]
NOTE: Include the following paragraphs if the need for energy recovery devices is required by ASHRAE 90.1 or facility is looking to get LEED certification. Confirm the type of energy recovery to be used with the PWD.
[Provide total energy (enthalpy) type energy recovery wheels (heat wheels) in the air handling system
[Provide heat pipe energy recovery in the air handling system.]
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