• Basic knowledge training materials of refrigeration and air conditioning Jan 10, 2023
    Basic terminology of refrigeration 1. Refrigeration: The process of removing heat from an object or fluid and discharging it into the ambient medium to produce a temperature lower than the ambient temperature. 2. Refrigerant: the working substance that continuously completes the cycle in the refrigeration device. Common refrigerants: R22, R134A, R410A, R32, R290, R404A, R717, water. 3. Refrigerant...
  • How to Adjust Evaporation Temperature Jun 15, 2022
    The change of the evaporation temperature of the refrigeration equipment in the cold storage is related to the heat load of the warehouse, the heat transfer area of the evaporator, and the volume of the compressor. When one of these three conditions changes, the evaporating temperature and pressure of the refrigeration system must change. Heat transfer area changes Effect on Evaporation Temperatur...
  • The relationship between the four components of the refrigeration system and the cooling capacity Jun 15, 2022
    Because the refrigerating capacity of each cold storage refrigeration equipment will change under different working conditions, some increase, some decrease, so a certain margin is reserved in advance in the design to prevent certain operating conditions. During operation, the cooling capacity of the whole device cannot be properly exerted due to the excessive reduction of the cooling capacity of ...
  • Common faults of cold storage equipment
    Common faults of cold storage equipment Jun 08, 2022
    1. Refrigerant leakage: After the refrigerant leaks in the system, the cooling capacity is insufficient, the suction and exhaust pressures are low, and the intermittent "squeaking" airflow sound much larger than usual can be heard at the expansion valve. There is no frost or a small amount of floating frost on the evaporator. If the expansion valve hole is enlarged, the suction pressure still does...
  • The function and description of each component of the cold storage system
    The function and description of each component of the cold storage system Jun 08, 2022
    1. Compressor: It plays the role of compressing and driving the refrigerant in the refrigerant circuit, and is the power of the refrigeration system. 2. Condenser: It is one of the main heat exchange equipment in the refrigeration system of cold storage. Its function is to cool and condense the superheated vapor of the high-temperature refrigerant discharged from the compressor of the assembled co...
  • Application and Characteristics of Industrial Evaporators
    Application and Characteristics of Industrial Evaporators Jun 02, 2022
    Evaporator (finned tube heat exchanger) is a device that directly absorbs heat from the air by the air source. When the refrigerant flows in the copper tube of the evaporator, it absorbs the latent heat in the air and boils. However, due to the low heat transfer coefficient on the air side, in order to meet the heat transfer capacity, without increasing the heat transfer temperature difference, th...
  • Application and characteristics of various industrial evaporators and condensers
    Application and characteristics of various industrial evaporators and condensers Jun 02, 2022
    The essence of the condenser is a wall heat exchanger with a high temperature gaseous refrigerant on one side and a cooling medium air or water on the other side. It is an indispensable device for transferring part of the heat of the heat source body to the cold fluid to realize heat exchange and heat transfer. There are often some corrosive and oxidizing substances in heat exchange, especially th...
  • Common faults of cold storage refrigeration system (3)
    Common faults of cold storage refrigeration system (3) Apr 13, 2022
    6. The oil temperature is too high cause of issue: The cooling effect of the oil cooler decreases; Insufficient oil cooling water supply; Abnormal wear and tear of the compressor of condensing unit; Method of exclusion: The oil cooler is dirty and needs to be cleaned; increase water supply; Check the compressor of condensing unit; 7. Oil pressure is too low cause of issue: The oil pressure gauge i...
  • Common faults of cold storage refrigeration system (2)
    Common faults of cold storage refrigeration system (2) Apr 13, 2022
    3. The suction pressure is too high cause of issue: Excessive opening of expansion valve; There is a problem with the expansion valve or the position of the temperature sensor is incorrect; The amount of refrigerant in the system is too large; Excessive heat load; The suction valve is broken, high and low pressure blow-by gas; The safety valve is opened prematurely, and the high and low pressure a...
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