Geothermal Cooling
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Ground source heat pumps and air source heat pumps work in a similar manner. Geothermal cooling or heating is considered to be the most efficient and sensitive space conditioning system. The basic idea behind the system is to make use of the constant temperature (55 degrees) for cooling or heating of the building.
The heat is tapped in a steady manner and the flow of heat is regulated from the surface of the earth during the winter season. Geothermal heat pumps have the capacity to save up to 40 to 70 % cost of heating and 30 to 50 % of cooling costs as compared to the conventional system of heating.
Geothermal pumps work with the help of water circulation through the closed loop pipe that has been buried under the ground surface. Closed loop systems have gained popularity because the pipes can be laid either vertically or horizontally according to convenience.
The main action of the heat pump is to move the heat from the location of low temperature to a location of high temperature. The process starts as the cool liquid refrigerant is passed with the help of the heat exchanger and the heat is absorbed from the source of low temperature.
Evaporation of refrigerant takes place as soon as the heat is absorbed. The temperature rises above 180 degrees F after it is passed through the compressor. The refrigerant changes to liquid form soon after losing the heat. The flow is reversed in the air conditioner.
Geothermal cooling process includes the absorption of heat energy from the surrounding air in the environment and moving it down to the earth. Expansion, condensation, compression and evaporation cycles take place when the heat is transferred from the air to the earth.
Transfer of heat medium is done with the help of a refrigerant. Geothermal cooling cycle process starts immediately after the conversion of the refrigerant to water and then to the refrigerant in the heat exchanger. The duct helps in returning the air which is humid and warm to the air coil which is cold.
The refrigerant which is hot is returned back to the compressor. The process of cooling involves the constant repeating of this cycle. Part of heat which is back to the compressor is sent to the other refrigerant circuit.
Flip switch that is provided within the system has the ability to convert the geothermal heating to geothermal cooling system.
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