The temperature aspects of refrigeration are broad, including evaporation temperature (te), suction temperature (ts), condensation temperature (tc), and discharge temperature (td). The evaporation temperature (te) and condensation temperature (tc) play a decisive role in the operating conditions of the refrigeration system.
Evaporation temperature (te): The temperature at which the liquid refrigerant boils and vaporizes in the evaporator. te cannot be directly measured; it is obtained by measuring the corresponding evaporation pressure.
Condensation temperature (tc): The temperature at which the superheated refrigerant vapor condenses into a liquid in the condenser after releasing heat. Condensation temperature cannot be directly measured. It is obtained by measuring the corresponding condensation pressure. A higher condensation temperature corresponds to a higher condensation pressure. Excessively high condensation temperatures result in heavy unit load, motor overload, and adverse operating conditions, leading to a decrease in cooling capacity and an increase in power consumption.
Discharge temperature (td): The temperature at the discharge port (including the temperature of the discharge port connection). Measuring discharge temperature requires a temperature measuring device, which is generally not provided for small units. Temporary measurements can be taken with a semiconductor thermometer, but the error is relatively large. Discharge temperature is affected by the suction temperature and condensation temperature. An increase in suction or condensation temperature will result in a corresponding increase in discharge temperature. Therefore, controlling the suction and condensation temperatures is necessary to stabilize the discharge temperature.
Suction temperature ts refers to the gas temperature at the suction connection pipe. A temperature measuring device is required to detect the suction temperature, but small units generally do not have one. During testing and debugging, it is usually estimated by touch. The suction temperature of an air conditioning unit should ideally be controlled at around ts = 15℃. Exceeding this value will have a certain impact on the cooling effect.
