Top 10 common faults in maintenance and debugging of refrigeration systems

What is the effect of pressure and temperature on the refrigeration system Refrigeration system performance testing involves many aspects, of which pressure and temperature are two points that cannot be bypassed. Today we will take a look at the pressure and temperature in the refrigeration system. 1. Detection of pressure and temperature of refrigeration system The pressure concept of the refrigeration system: the refrigeration system can be divided into high and low pressure parts during operation. The high-pressure section runs from the discharge port of the compressor to the throttle valve. This section is called the discharge pressure. The suction port pressure of the compressor is called the suction pressure, and the suction pressure is close to the evaporation pressure. 1) Evaporation temperature: Refers to the temperature at which the liquid refrigerant boils and vaporizes in the evaporator. For example, te of air-conditioning unit. It is 5~7 degrees as the optimal evaporation temperature of the air conditioning unit, that is to say, the design te of the air conditioning unit is between 5~7 degrees. , High-speed expansion valve should be used to detect the suction pressure of the compressor. The purpose is to understand the evaporation temperature of the unit during operation, but te cannot be directly detected, and the evaporation temperature can only be obtained by detecting the corresponding evaporation pressure (by consulting the refrigerant thermodynamic properties table). 2) Condensation temperature: It is the temperature when the superheated vapor of the refrigerant condenses into a liquid after releasing heat in the condenser. The condensing temperature can not be directly detected, only by detecting the corresponding condensing pressure, and then by consulting the refrigerant thermal properties table. Condensation temperature is high, and its condensing pressure is relatively high, they correspond to each other. Condensing temperature is too high, the load of the unit is heavy, and the motor is overloaded, which is unfavorable for operation. Its cooling capacity decreases accordingly and power consumption rises, and it should be avoided as much as possible. 3) Exhaust temperature: Refers to the temperature of the compressor exhaust (including the temperature of the exhaust port). The exhaust temperature must have a temperature measurement device. Generally, small computers are not set up. The temporary measurement can be detected with a semiconductor point thermometer, but the error is large. The exhaust temperature is affected by the suction temperature and the condensation temperature. When the suction temperature or the condensation temperature increases, the exhaust temperature also increases accordingly. Therefore, the suction temperature and the condensation temperature must be controlled to stabilize the exhaust temperature. 4) Suction temperature: Refers to the gas temperature of the suction connection pipe of the compressor. A temperature measurement device is required to detect the suction temperature. Generally, small units do not have a temperature measurement device. Generally, they are estimated by hand touch during maintenance and debugging. ts=15 degrees is better. Exceeding this value has a certain effect on the cooling effect. Second, the influence of suction pressure changes on the refrigeration system The suction pressure is closely related to the evaporation temperature and the flow rate of the refrigerant. For systems using expansion valves, the suction pressure is related to the degree of opening of the expansion valve, the refrigerant charge, the compressor's cooling efficiency, and the size of the load. 1) Low inspiratory pressure: The suction pressure is lower than the normal value. The factors are insufficient cooling capacity, small cooling load, small expansion valve opening, low condensing pressure (referring to the capillary system), and the filter is not smooth. 2) High suction pressure: The suction pressure is higher than the normal value. The factors include excessive refrigerant, large cooling load, large opening of the expansion valve, high condensing pressure (capillary system), and poor compressor efficiency. Third, the impact of exhaust pressure changes on the refrigeration system When the refrigeration system is operating, its exhaust pressure corresponds to the condensation temperature, and the condensation temperature is related to the flow rate and temperature of the cooling medium, the amount of refrigerant inflow, and the amount of cooling load. When checking the refrigeration system, an exhaust pressure gauge should be installed at the exhaust pipe, and the exhaust pressure should be detected to analyze the fault data. 1) High exhaust pressure: When the exhaust pressure is higher than the normal value, the flow rate of the cooling medium is generally low or the temperature of the cooling medium is high, the refrigerant charge is too large, the cooling load is large, and the expansion opening is large.

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