The centrifugal compressor in vapour compression refrigeration system is very sensitive to

Explanation:

Centrifugal Compressor:

• A centrifugal compressor is a dynamic compressor used in various refrigeration systems. It operates by converting the kinetic energy of a fluid into pressure energy via a rotating impeller. In a vapour compression refrigeration system, the centrifugal compressor is critical for compressing refrigerant vapour to a higher pressure and temperature, enabling heat rejection at the condenser.

Working Principle: The centrifugal compressor works by accelerating the refrigerant vapour using a high-speed impeller. The velocity of the refrigerant increases as it passes through the impeller, and this kinetic energy is then converted into pressure energy in the diffuser. The resulting pressurized refrigerant vapour is sent to the condenser for heat rejection.

The centrifugal compressor's performance in a vapour compression refrigeration system is highly sensitive to both the evaporator temperature and the condenser temperature. Here’s why:

• Evaporator Temperature: The evaporator temperature determines the pressure at which the refrigerant enters the centrifugal compressor. Lower evaporator temperatures correspond to lower suction pressures. If the suction pressure drops too much, the compressor may face issues such as surge, reduced efficiency, or stalling. Additionally, the refrigerant density at the inlet is affected, which influences the compressor’s capacity.
• Condenser Temperature: The condenser temperature determines the discharge pressure of the compressor. Higher condenser temperatures correspond to higher discharge pressures. If the discharge pressure is excessively high, the compressor requires more work, increasing power consumption and potentially causing mechanical stress or operational instability.

Thus, the centrifugal compressor's operation is intricately linked to both the evaporator and condenser temperatures, as these parameters significantly affect the suction and discharge pressures, refrigerant density, and overall compressor efficiency. A balanced and stable operation of the refrigeration system necessitates keeping both temperatures within optimal ranges to ensure efficient and reliable compressor performance.