Air-Water-or-Geothermal-to-Domestic-Water Heat Pumps for Water Heating
Water Heating via Heat Pumps
Air-Water-or-Geothermal-to-Domestic-Water Heat Pumps for Water Heating
Heating water in New York City’s buildings can be expensive and harmful to the environment, especially if fossil-fuel-burning heaters or furnaces are used. In fact, older heaters can waste up to 20% of their fuel, and even newer models can waste up to 10%. This results in more money spent and more carbon emissions released into the environment.
OVERVIEW
Air-Water-or-Geothermal-to-Domestic-Water Heat Pumps for Water Heating
Air-water-or-geothermal-to-domestic-water heat pumps are also referred to as heat-pump water heaters (HPWHs). They gather heat from the surrounding air or from water and deposit the heat into water at a usable temperature for water heating.
Details include:
- Various sizes: modular designs and residential units available
- Low-ambient operation
- Output water to greater than 140°F
- Water storage allows for reduced installed tonnages
- Domestic hot water (DHW) is the last apparatus requiring gas in Passive House buildings
- Gains in overall building efficiency mean DHW is now the largest consumer of energy in a building, which can be reduced via air-to-water heat pumps
PRODUCTS
Colmac CxA – Modular Air-Source Heat-Pump Water Heater
- Next generation of air-source heat pumps from Colmac WaterHeat
- Models include compressors from 10 to 30 hp, with optional VFDs to provide turndown and soft-start capabilities
- ECM propeller fans come standard, with optional ECM plenum fans that can accommodate up to 3″ of external static pressure
- Modifications to the refrigeration circuit allow the CxA to operate with air temperatures 10°F lower than HPA units
- CxA units are modular with a taller profile and reduced footprint design – CxA-10 and -15 models are designed to fit through a standard 36″ door and inside most elevators for easier installation, particularly in retrofits
- CxA units require no service clearance on the sides, allowing them to be placed next to each other in arrays of up to eight units
- Slide-out drawers allow for in-place servicing of the refrigeration components
- Individual unit controllers can interconnect via ethernet to perform their own staging, run-time balancing and BMS communications
- To improve COPs and hot water output, the CxA series has a completely redesigned defrost system
- Hot-gas defrost has been added to the evaporator, cutting defrost times to mere minutes
- New intelligent defrost controls monitor operating conditions so units only go into defrost mode when necessary
Colmac CxW Series – Modular, Water-Source Heat-Pump Water Heater
- Single model featuring a 5-hp compressor, propeller fan and PLC controls
- Using vapor injection technology, the CxV is capable of producing 140°F water at 10°F ambient air
- The unit can continue to operate down to -4°F, producing 120°F water
- The CxV utilizes the same intelligent-defrost control and hot-gas defrost that was developed on the new CxA series, improving hot water output, minimizing defrost cycles and maximizing COPs
- As with all Cx series units, individual CxV unit controllers can interconnect (up to 8 units) to perform staging, runtime balancing and BMS communications
- Swing-out door allows for excellent access to all internal components
- Features external high- and low-pressure measurement ports
Colmac CxW Series – Modular, Water-Source Heat-Pump Water Heater
- Use energy collected from a fluid stream to heat domestic water to temperatures up to 185ºF
- The source fluid can be any filtered, non-corrosive, pressurized stream of liquid at temperatures as low as 50°F
- CxW modules can be arranged in banks to meet any capacity requirement
- PLC interconnectivity allows multiple units to act as a single machine
- Fits through a standard 36″ door, making it ideal for retrofits and high-rise applications
- Also stackable, doubling the capacity per square foot
Let’s create a more sustainable world.
Our team partners with engineers, contractors, owners and operators across all commercial and high-rise residential building types. We customize our building efficiency technologies for every job to meet the specific needs of the most demanding structures.
