// CODE SNIPPET
C403.4.3.3.2 Heat Rejection
JUMP TO FULL CODE CHAPTER
The following shall apply to hydronic water loop heat pump systems in Climate Zones 3 through 8:
- Where a closed-circuit cooling tower is used directly in the heat pump loop, either an automatic valve shall be installed to bypass the flow of water around the closed-circuit cooling tower, except for any flow necessary for freeze protection, or low-leakage positive-closure dampers shall be provided.
- Where an open-circuit cooling tower is used directly in the heat pump loop, an automatic valve shall be installed to bypass all heat pump water flow around the open-circuit cooling tower.
- Where an open-circuit cooling tower is used in conjunction with a separate heat exchanger to isolate the open-circuit cooling tower from the heat pump loop, heat loss shall be controlled by shutting down the circulation pump on the cooling tower loop.
Exception: Where it can be demonstrated that a heat pump system will be required to reject heat throughout the year.
Related Code Sections
C403.4.2.3.2 [CE] Commercial Energy Efficiency, Heat Rejection
Heat rejection equipment shall comply with Sections C403.4.2.3.2.1 and C403.4.2.3.2.2. Exception: Where it can be demonstrated that a heat pump ...
Energy Conservation Code 2015 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.4 Hydronic and Multiple-Zone HVAC Systems Controls and Equipment. (Prescriptive) > C403.4.2 Hydronic Systems Controls > C403.4.2.3 Hydronic (Water Loop) Heat Pump Systems > C403.4.2.3.2 Heat Rejection
C403.4.3.3.2 [CE] Commercial Energy Efficiency, Heat Rejection
pump system will be required to reject heat throughout the year ...
Energy Conservation Code 2018 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.4 Heating and Cooling System Controls (Mandatory) > C403.4.3 Hydronic Systems Controls > C403.4.3.3 Hydronic (Water Loop) Heat Pump Systems > C403.4.3.3.2 Heat Rejection
C403.9.1 [CE] Commercial Energy Efficiency, Fan Speed Control
temperature and pressure of the heat rejection device. Fan motor power input shall be not more than 30 percent of design wattage at 50 percent of the design ...
Energy Conservation Code 2018 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.9 Heat Rejection Equipment > C403.9.1 Fan Speed Control
C403.9.3 [CE] Commercial Energy Efficiency, Limitation on Centrifugal Fan Open-Circuit Cooling Towers
Centrifugal fan open-circuit cooling towers with a combined rated capacity of 1,100 gpm (4164 L/m) or greater at 95°F (35°C) condenser water return ...
Energy Conservation Code 2018 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.9 Heat Rejection Equipment > C403.9.3 Limitation on Centrifugal Fan Open-Circuit Cooling Towers
C403.9.4 [CE] Commercial Energy Efficiency, Tower Flow Turndown
Open-circuit cooling towers used on water-cooled chiller systems that are configured with multiple- or variable-speed condenser water pumps shall ...
Energy Conservation Code 2018 of Colorado > 4 [CE] Commercial Energy Efficiency > C403 Building Mechanical Systems > C403.9 Heat Rejection Equipment > C403.9.4 Tower Flow Turndown