The throttling process is used in vapor compression refrigeration systems because they reduce the pressure of the high-pressure refrigerant liquid which came out of the condenser to lower pressure. This causes a significant drop in the temperature of the refrigerant. This low-temperature refrigerant liquid-vapor mixture is then used to absorb heat from the refrigeration space. The advantage of using a throttling valve is that it does not produce any thermodynamic work and throttling valves are very cost-effective compared to expansion devices such as turbines. Hence, they cause a significant reduction in the initial cost of VCRS.
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