Pressure and temperature of cooling water

Pressure and temperature of cooling water

The chiller unit operates under nominal operating conditions, with a condenser inlet temperature of 32 ℃ and an outlet temperature of 37 ℃, with a temperature difference of 5 ℃.

The method and principle for adjusting the opening of the outlet valve of the cooling water pump and the inlet and outlet valve of the condenser are as follows:

1. The outlet of the condenser should have sufficient pressure to overcome the resistance in the cooling water pipeline;

2. When the chiller operates at the design load, the temperature difference between the cooling water entering and exiting the condenser is 5 ℃. It should also be noted that arbitrarily opening the cooling water valve excessively and increasing the cooling water volume to reduce condensation pressure, attempting to reduce energy consumption, can only backfire and have the opposite effect.

Measures to reduce condensation temperature:

Reducing the inlet water temperature of the condenser involves increasing the cooling water volume. However, excessively increasing the flow rate of cooling water often leads to a sharp increase in power consumption of the cooling water pump, and the desired results cannot be achieved. The suction temperature of the compressor

The suction temperature refers to the temperature of the refrigerant gas in the suction chamber of the compressor. The suction temperature not only affects the exhaust temperature, but also has a significant impact on the volumetric cooling capacity of the compressor. When the suction temperature of the compressor is high, the discharge temperature is also high, and the specific capacity of the refrigerant when it is sucked in is large. At this time, the refrigeration capacity per unit volume of the compressor is small. On the contrary, when the suction temperature of the compressor is low, its unit volume cooling capacity is large. However, if the suction temperature of the compressor is too low, it may cause the refrigerant liquid to be sucked in by the compressor, and the compressor should be avoided from experiencing liquid hammer.

To ensure the normal operation of the compressor, its suction temperature needs to be higher than the evaporation temperature, which means it should have a certain degree of superheat. For piston chillers, the suction superheat is generally between 5 ℃ and 10 ℃. If a dry evaporator is used, the superheat can be adjusted by adjusting the adjusting screw of the thermal expansion valve. In addition, it is important to note that the length of the suction pipeline of the compressor and the performance of the insulation material wrapped around it can have a certain impact on the degree of superheat.

www.superbheater.com