26. IT Server Room Requirements: a) Wherever possible, cooling shall be configured with separate hot and cold aisles. All return air shall come from within or overhead of hot aisles, and all cooling shall be supplied into cold aisles at or below the top of racks using radial/laminar flow diffusers, perforated duct, or fabric ducts. In row cooling units, rack door cooling, and rack top cooling units will satisfy this requirement. Console units, wall mounted units and other non-ducted units should not be used. b) All IT equipment shall have air intakes directed to cold aisles and hot air discharges directed to hot aisles. c) All temperature sensors used to control cooling equipment in IT rooms shall be located in cold aisles, preferably with averaging sensors located on rack doors and shall be set to no less than 78 F. d) Doors, heavy curtains, or other air barriers shall be installed extending from the tops of racks to the finished floor between the end of racks and IT room walls to maintain hot and cold aisle separation. e) All unused spaces in equipment racks shall be fitted with blanking panels. f) IT rooms primarily used for network switching equipment and associated uninterruptible power supplies shall be cooled by transferring air from occupied space into the cold aisle and from the hot aisle to the AHU return air duct with a thermostatically controlled transfer fan. Do not provide DX cooling for such rooms without identifying a unique need based on published equipment operating requirements. g) Provide sealed walls floor to slab to ensure air tightness within the IT server rooms and other spaces with supplemental cooling. All pipe, duct and cable penetrations shall be sealed. Provide insulation in the partitions. 27. HVAC General Equipment Specifications: a) VAV chilled water AHUs shall have the following features: directly driven airfoil plenum fans, 4” deep filter rack MERV 13, stainless steel drain pan, tool free access, safety catches on access doors. For airflows less than 10000 CFM AAON V3 series AHUs may be used to save space. Otherwise, modular units from JCI, Trane, Carrier, or Nortek shall be used. b) Water-cooled DX units shall be Mammoth V-Cube, Daikin SWP or Trane Modular and shall have shell-and-tube condensers with control valves per circuit and water economizer coils. Water side pressure drops must not exceed the available differential pressure. c) VRF equipment shall be Mitsubishi, Samsung, Daikin, LG, Fujitsu, Hitachi or approved equal performance, and shall be provided with a BACnet interface for monitoring. d) ERVs may be separate from the AHU or integrated within the AHU. ERVs shall be Semco FV, Greenheck ERV; shall be from the modular AHU line of JCI, Trane, Carrier, or Nortek. A single ERV may be used to serve 2 AHUs. ERV wheels shall have effectiveness ratings that meet the fan system power exemption in ASHRAE 90.1-2016 or successor standards. ERV fans shall be variable speed and air flow monitoring shall be provided in exhaust and supply ducts by way of VAV boxes at each AHU if airflow is controlled independently for each AHU or can be provided at the ERV intake and exhaust ducts if airflow is manually balanced for each AHU. Provide MERV 8 filters on the outdoor intake and exhaust air before the wheel/heat exchanger.
E. HVAC – Building Specific Requirements
Empire State Building:
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