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Anatomy Of Pressure Regulation Of Small Chiller Condenser

Aug 16, 2018

Anatomy of pressure regulation of small chiller condenser


In the operation of a small chiller, a change in temperature causes a change in condensing pressure. In particular, the high condensing pressure in summer will lead to an increase in the power consumption of the compressor, resulting in a gradual decrease in the cooling capacity, which indirectly causes the cycle of the low-temperature chiller to deteriorate, and proper reduction of the condensing pressure is necessary.


Anatomy of pressure regulation of small chiller condenser


Then, the condensing pressure of the unit in the winter is too low, the supply power of the throttle valve is not sufficient, and the high-pressure liquid pipe is constantly affected by the heating factor, and they all reduce the capacity of the throttle valve, so it is necessary to control the condensing pressure of the low-temperature chiller. Therefore, it is imperative to control the condensing pressure throughout the year.


The pressure of the condenser can be controlled by adjusting the heat exchange capacity of the condenser. When the heat exchange of the condenser increases, the gas discharged from the compressor (vortex/piston) is sufficiently condensed, and the condensing pressure is gradually decreased. When the heat exchange performance of the condenser is weakened, the condensing pressure is continuously increased.


For example, a water-cooled condenser can regulate the condensing pressure of the cooling water flow. Install a regulating valve on the condenser cooling water outlet pipe. There are two modes of water regulating valve: one is a temperature type water regulating valve that indirectly transmits the temperature at the outlet of the condenser cooling water. It has a temperature sensor that plugs into the condensate outlet. When the water temperature rises, the valve opens; when the water temperature decreases, the valve closes. The other is a pressure type water regulating valve that directly sends a condensing pressure to draw a pressure signal from the condenser. When the condensing pressure is gradually increased, the valve is opened; when the condensing pressure is lowered, the valve is closed, thereby changing the cooling water flow rate of the condenser.


There is also a special case: the water-cooled condenser adopts a self-contained cooling tower cooling water circulation system. In order to prevent the condensing pressure from being too low, it can be adjusted by a water bypass valve, which sends a part of the water from the condenser to the cooling tower for cooling. Some of them return to the bypass return.


For large-scale low-temperature chiller units, if multiple cooling pumps are used to supply water to the water condenser in parallel, the number of pumps running can be changed according to the constant change of condensing pressure to adjust the cooling water flow.