Hot Gas Defrost
Hot gas defrost is primarily used in supermarket applications and ice machines because it is quick and efficient. During defrost, hot gas enters the evaporator downstream of the TEV. The hot refrigerant warms the tubing inside the evaporator, which is more effective than electric heaters that warm the fins outside the tubing. Installing a hot gas defrost system can be very labor intensive due to additional piping and valves. However, hot gas is more effi cient because the compressor can generate the same amount of Btuh as electric heaters but with less electrical energy.
Source : Commercial Refrigeration: For Air Conditioning Technicians
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