HPA Series Air Source Heat Pumps
Colmac HPA air source heat pumps use energy collected from air to heat domestic water up to 185ºF.
Almost any air source can be used down to temperatures as low as 20ºF (with reduced output temperatures). Evaporator coatings and corrosion resistant cabinets are availale.
HPA units are available with propeller fans for increased efficiency or centrifugal blowers for high static applications.
Air Source Heat Pump Basics
Energy from warm air is absorbed by refrigerant in the evaporator causing the refrigerant to change phase from a liquid to a gas. This gas refrigerant is then compressed by a compressor which adds temperature and pressure to the refrigerant. The high temperature, high pressure refrigerant gas is then condensed to a liquid in a condenser where energy is traded from the refrigerant to sanitary water suitable for human consumption. Finally, the high pressure, liquid refrigerant is passed through an expansion valve which causes the refrigerant pressure and temperature to drop so it can once again enter the evaporator and absorb energy from the air.
To maximize the efficiency of an air source heat pump provide the warmest and most humid air available and try to deliver the lowest sanitary water temperature acceptable. This minimizes the compressor work which is the largest operational cost associated with a heat pump.
Since the Colmac HPA units use the same principle as an air-conditioner, it produces cool air as it makes hot water. This "free" cool air benefit can be put to use to supplement an existing air-conditioning system, or to provide "spot cooling" to hot work areas.
Colmac HPA heat pumps can be successfully applied wherever there is a need for large amounts of hot water and there is a source of warm air available. The Colmac HPA is best suited for supplying hot water in facilities where demands for hot water and space cooling are concurrent.
HPA Installation Drawings