Centrifugal compressors are available for cooling duty as an integral part of centrifugal chillers. Due to the relatively flat head-power characteristics of centrifugal compressors and by way of a limitation of the operating range, the component parts of centrifugal refrigeration systems have to be very carefully balanced. Because very dramatic changes in the vessel, can occur with only minor changes in the suction or condensation temperature, centrifugal refrigeration chiller must be monoblock minimize refrigerant line pressure drops.
Schematic diagram of the centrifugal refrigeration systems. Except for the introduction of flash intercooler (economizer) is used to desuperheat pairs entering the second stage and subcool refrigerant in the evaporator, centrifugal refrigeration system works on a conventional steam cycle of compression. Work economizer as follows:
High pressure liquid effluent from the bottom of the condenser in the upper chamber of the economizer.
Die high pressure liquid passes through the hole of high pressure float valve, part of outbreaks in the vapor state, thus cooling the fluid balance to a temperature corresponding to the pressure in the lower house of the economizer.
This pressure was slightly higher than the pressure of the refrigerant leaving the first stage of compression.
A pair of funds from lower chamber of the economizer in the first stage of the return channel, where he desuperheats steam output of the first stage of compression. This process increases the productivity and efficiency of the system, because the steam pressure in the lower house of the economizer higher pressure in the evaporator. Thus, less energy is required to compress it to a pressure of condensation.
From the lower chamber of the economizer, cool the liquid passes through the lower float valve die in the evaporator. As he enters the evaporator part flashes, reducing the temperature of the remaining liquid. The overall effect of the economizer is to increase the refrigerating effect per unit mass refrigerai number of outbreaks of vapor in the nose, less compressor pow same number flashed part of the total amount of compression stages.
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