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Heat Pump Fundamentals

Basic Principles of Operation

Water to air Heat Pump – Heat is rejected to the water from the air being conditioned (cooled) on the cooling cycle. While the heat is absorbed from the water by the air being conditioned (heated) on the heating cycle. Dehumidification is also achieved on the cooling cycle by removal of moisture from the air in the form of condensate. The medium of heat transfer is refrigerant.

Balanced Energy Use

The most beneficial aspect of the WSHP system is in balanced energy use. The system schematic shown below, illustrates a water source heat pump system running in a balanced mode. No additional system heat, (boiler operation) or system cooling (cooling tower) is required.

Very Cold Weather Use

The system schematic shown below, illustrates a water source heat pump system running in a heating mode on a very cold day. Additional system heat, (boiler operation) is providing mechanical tempering of the main water loop. The boiler operation is only required to maintain a minimum loop water temperature of 60°F.

Very Warm Weather Use

The system schematic shown below illustrates a water source heat pump system running in a cooling mode on a very warm day. Additional system cooling, (cooling tower operation) is providing mechanical tempering of the main water loop. The cooling tower operation is only required to maintain a maximum loop water temperature of 90°F.