Project Name
Project Number
UEPH Complex
Statement of Work
26 November 2001
11-4
WIND. Wind power may be considered in regions where determined cost effective.
Factors such as average wind speed, available wind power, and wind variability shall be
considered when investigating the annual useful energy production potential.
11-5
shall be given to installation of a heat exchanger to recover condenser heat and desuperheat
for use in heating domestic water. A standard, domestic water heater shall be provided in
conjunction with this system to provide hot water during the heating season. Heat pump water
heaters can be considered in hot climates.
11-6
ENERGY RECOVERY EQUIPMENT.
11-6.1
Plate heat exchangers. Unit shall be a factory fabricated and tested assembly for
stationary air-to-air energy recovery by transfer of sensible heat from exhaust air to supply air
stream. Heat transfer surface shall be constructed of aluminum. Enclosure shall be fabricated
from galvanized steel and shall include maintenance access provisions.
11-6.2
Rotary heat exchangers. Unit shall be a factory fabricated and tested assembly for
air-to-air energy recovery by transfer of sensible heat from exhaust air to supply air stream.
Device performance shall be according to ASHRAE 84. Exchange media shall be chemically
inert, moisture-resistant, fire-retardant, laminated, nonmetallic material which complies with
NFPA 90A. Exhaust and supply streams shall be isolated by seals which are static, field
adjustable, and replaceable. Chain drive mechanisms shall be fitted with ratcheting torque
limiter or slip-clutch protective device. Enclosure shall be fabricated from galvanized steel and
shall include maintenance access provisions.
11-6.3
Heat recovery coils. Coil assembly shall be factory fabricated and tested air-to-
liquid-to-air energy recovery system for transfer of sensible heat from exhaust air to supply air
stream. System shall deliver an energy transfer effectiveness without cross-contamination with
maximum energy recovery at minimum life cycle cost. Components shall be computer
optimized for capacity, effectiveness, number of coil fins per inch, number of coil rows, flow rate
and frost control. Coils, pumps, controls and piping materials shall conform to Chapter 10
HVAC.
11-6.4
Heat pipe. Device shall be a factory fabricated, assembled and tested, counterflow
arrangement, air-to-air heat exchanger for transfer of sensible heat between exhaust and supply
streams. Device shall deliver an energy transfer effectiveness without cross-contamination.
Heat exchanger tube core shall be seamless aluminum or copper tube with extended surfaces,
utilizing wrought aluminum Alloy 3003 or Alloy 5052, temper to suit. Tubes shall be fitted with
internal capillary wick, filled with an ASHRAE 15, Group 1 refrigerant working fluid, selected for
system design temperature range, and hermetically sealed. Heat exchanger frame shall be
constructed of not less than 16 gauge galvanized steel and fitted with intermediate tube
supports, and flange connections. Tube end-covers and a partition of galvanized steel to
separate exhaust and supply air streams without cross-contamination and in required area ratio
shall be provided. [A drain pan constructed of welded Type 300 series stainless steel shall be
provided.] Heat recovery regulation shall be provided by [system face and bypass dampers and
related control system as indicated] [interfacing with manufacturer's standard tilt-control
mechanism for summer/winter operation, regulating the supply air temperature and frost
prevention on weather face of exhaust side at temperature indicated]. Coil shall be fitted with
pleated flexible connectors.
SOW-148
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