Heat Pump Refrigeration System – Heating Mode

Reversing Valve: 4-way slide Coaxial Heat Exchanger: Transfers action valve that reverses the heat energy from the water being Colder Water refrigerant flow direction to the Water In circulated through the exchanger to Out heat exchangers. In heating the cold, boiling refrigerant. The mode, the valve coil is 4 water is cooled by this process. de-energized and the hot 4 3 refrigerant vapor from the compressor is diverted into Filter-Drier: the airside coil. Removes water, debris and other contaminants from the refrigerant.

Cold Air Warm Air

Thermostatic Expansion Valve: Separates the high 2 side from the low 1 side by creating a Accumulator: large pressure drop Prevents liquid across the valve. refrigerant from Compressor: Removes the refrigerant Refrigerant is entering the vapor from the low side of the system metered into the compressor. and pumps it into the high side. Airside Coil: Transfers heat low side to maintain energy from the hot refrigerant a preset superheat, vapor to the cold air, heating therefore utilizing REFRIGERANT PROPERTIES the air and causing the all of the heat Location Refrigerant State T, ºF Pressure, psig Superheat/Subcool refrigerant to condense. exchanger. 1 Hot Vapor 135 250 50°F Superheat 2 Warm Liquid 70 250 15°F Subcool 3 Saturated Liquid-Vapor Mix ~35 105 4 Cold Vapor 45 105 10°F Superheat 00.TAP.NB005 R1 1-2011 RG Water entering the coaxial heat exchanger is cooled through the heat being absorbed by the refrigerant and typically leaves about 6ºF cooler. Copyright © 2011 Greenheck Fan Corp. Heat Pump Refrigeration System – Cooling Mode

Reversing Valve: 4-way slide Coaxial Heat Exchanger: Transfers action valve that reverses the heat energy from the hot refrigerant Warmer Water refrigerant flow direction to the Water In vapor to the cooler water being Out heat exchangers. In cooling circulated through the exchanger. The mode, the valve coil is energized water is warmed by this process. and the hot refrigerant vapor 1 2 from the compressor is diverted into the water-to-refrigerant heat Filter-Drier: exchanger. Removes water, debris and other contaminants from the refrigerant.

Warm Air Cold Air

Thermostatic Expansion Valve: Separates the high side from the low 4 3 side by creating a large pressure drop Accumulator: across the valve. Prevents liquid Refrigerant is refrigerant from Compressor: Removes the refrigerant metered into the entering the vapor from the low side of the system low side to maintain compressor. and pumps it into the high side. Airside Coil: Transfers heat a preset superheat, energy from the warm and therefore utilizing humid air to the cool, boiling all of the heat REFRIGERANT PROPERTIES refrigerant—cooling the air. exchanger. Location Refrigerant State T, ºF Pressure, psig Superheat/Subcool 1 Hot Vapor 150 320 50°F Superheat 2 Warm Liquid 85 320 15°F Subcool 3 Saturated Liquid-Vapor Mix ~45 130 4 Cold Vapor 55 130 10°F Superheat Water entering the coaxial heat exchanger is warmed by the heat it absorbs from the refrigerant and typically leaves about 10ºF warmer.