The Reason Why the Exhaust Temperature of the Chiller is too High
The exhaust temperature of the compressor in the chiller determines whether the operation of the equipment can be stable and efficient. The compressor is prone to the problem of excessive exhaust temperature. Once this happens, it is easy to make the pressure of the chiller too high. As well as increased temperature, excessive load, reduced chiller compressor efficiency and cooling capacity, it will also lead to various other problems. So what is the reason for the high exhaust temperature of the chiller?
1. The compression ratio is too high
The exhaust temperature is greatly affected by the compression ratio. The larger the compression ratio, the higher the exhaust temperature. Reducing the compression ratio can significantly reduce the exhaust temperature by increasing the suction pressure and reducing the exhaust pressure.
The suction pressure is determined by the evaporation pressure and the resistance of the suction line. Raising the evaporating temperature can effectively increase the suction pressure and rapidly reduce the compression ratio, thereby reducing the exhaust temperature. Reducing the resistance of the return air pipeline can also increase the return air pressure. The specific methods include replacing the dirty and blocked return air filter in time, and reducing the length of the evaporation pipe and the return air pipeline as much as possible.
In addition, insufficient refrigerant is also a factor for low suction pressure. After the refrigerant is used up, it should be replenished in time.
The main reason for the high exhaust pressure is that the condensing pressure is too high. Insufficient cooling area of the condenser, fouling, insufficient cooling air or water volume, too high cooling water or air temperature, etc., can lead to excessive condensing pressure. It is very important to choose a suitable condensation area and maintain sufficient cooling medium flow.
2. High return air temperature
The return air temperature is relative to the evaporation temperature. In order to prevent liquid backflow, the general return gas pipeline requires a return gas superheat of 20°C. If the return line is not well insulated, the superheat will be well over 20°C.
The higher the return air temperature, the higher the cylinder intake and exhaust temperature. For every 1°C increase in the return air temperature, the exhaust temperature will increase by 1 to 1.3°C.
3. Motor heating
For the return air cooling type refrigeration compressor, the refrigerant vapor is heated by the motor when it flows through the motor cavity, and the suction temperature of the cylinder is increased again. The amount of heat generated by the motor is affected by power and efficiency, while the power consumption is closely related to displacement, volumetric efficiency, operating conditions, and frictional resistance.
For the return air cooling type semi-hermetic compressor, the temperature rise range of the refrigerant in the motor cavity is roughly between 15 and 45°C. In the air-cooled (air-cooled) compressor, the refrigeration system does not pass through the winding, so there is no motor heating problem.
The reason why the exhaust temperature of the chiller is too high is shared here. We need to limit the exhaust temperature of the special refrigeration compressor for the chiller, so as to better promote the development of the industry.
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