Factors causing high exhaust temperature of chillers

If the exhaust temperature of the chiller is too high during normal use, we can check if the refrigeration system pipes are blocked. The occurrence of blockage faults may be due to too many impurities in the refrigeration system. We can also check if there is an excessive refrigerant replenishment. Once we find that there is an excessive refrigerant injection, we need to immediately release the excess refrigerant. Next, we can explore together what other reasons can cause the exhaust temperature of the chiller to be too high?

1. Compression ratio too high
The compression ratio has an impact on the exhaust temperature. The higher the compression ratio, the higher the exhaust temperature. We can lower the exhaust temperature of the chiller by reducing the compression ratio.

The specific operations include increasing the suction pressure and reducing the exhaust pressure. The suction pressure is determined by the evaporation pressure and the resistance of the suction pipeline. Increasing the evaporation temperature can effectively increase the suction pressure, thereby reducing the compression ratio and achieving the goal of reducing the exhaust temperature of the chiller. Reducing the resistance of the return air pipeline can also increase the return air pressure. By promptly replacing the clogged or dirty return air filter of the chiller, the length of the evaporator and return air pipes can be minimized as much as possible. Insufficient refrigerant can also lead to low suction pressure. When we discover a refrigerant leak, we must promptly replenish it.

2. Poor water quality
If the water quality used by the chiller is prone to scaling, there will be a large amount of scale in a short period of time. These substances will condense on the wall of the condenser tube, and excessive impurities will cause a significant decrease in the efficiency of the refrigeration system of the equipment, resulting in high exhaust temperature of the chiller. So we need to regularly clean the chiller equipment and clean the cooling water system and condenser in a timely manner. Change filters frequently, and so on.

3. High heating capacity of the motor
The heating of the chiller motor is affected by power and efficiency, and the temperature will relatively increase. The consumption of power, displacement, volumetric efficiency, and other factors are closely related to the increase in exhaust temperature.

4. Cooling system
When the cooling valve in the cooling system is not opened, or for other reasons, the cooling water cannot be supplied to the chiller, it will cause the exhaust temperature of the chiller to rise.

5. Poor heat dissipation of the condenser
Poor heat dissipation of the condenser can also cause an increase in the exhaust temperature of the chiller. The condenser is one of the important components of a chiller, which releases heat from the refrigerant into the air through its heat dissipation function, thereby achieving the purpose of refrigeration. If the condenser has poor heat dissipation, it indirectly leads to the inability to fully dissipate the heat in the refrigerant, ultimately resulting in an excessively high exhaust temperature of the chiller.

6. Dust accumulation and other malfunctions
Dust accumulation and other malfunctions inside the chiller can also cause the exhaust temperature of the chiller to be too high.

Source: Coolingstyle