The refrigerating working medium absorbs the heat of the cooled substance in the evaporator and vaporize into steam. The compressor constantly extracts the generated steam from the evaporator and compacts it. After compression, the high temperature and high pressure steam is sent to the condenser to release heat and condense into high pressure liquid to the cooling medium (such as water and air, etc.).
After the pressure is lowered by the throttle mechanism, it enters the evaporator and vaporizes again to absorb the heat of the cooled object, so that the cycle is repeated.When heating, the refrigerant changes the refrigerant flow direction through the four-way valve. The refrigerant flow direction is just opposite to that of refrigeration. The refrigerant first passes through the evaporator, then returns to the condenser, and finally returns to the compressor.
The exhaust temperature of the compressor is much higher than the condensation temperature. The direct influence factor of the exhaust temperature is the suction temperature of the compressor, and the two are proportional to each other.
In addition, the exhaust temperature is also related to the type of refrigerant and the level of compression ratio. Under the condition of air conditioning, the exhaust temperature is not very high because the compression ratio is not large.When the piston compressor suction and exhaust valve sheet is not tight or broken resulting in leakage (internal leakage), the exhaust temperature will rise significantly.