In a recirculation system, where is it important to keep constant pump pressure?

In a recirculation system, maintaining constant pump pressure at the metering valve evaporator inlet is crucial because this ensures that the proper flow rate and pressure are delivered to the evaporator. The metering valve regulates the amount of refrigerant entering the evaporator, and consistent pressure allows for optimal heat exchange. If the pressure fluctuates significantly, it can lead to inefficient operation, poor cooling performance, and potential issues with refrigerant flow and phase changes within the evaporator.

Consistent pressure at the evaporator inlet is essential for achieving the intended thermal performance and ensuring that the system operates effectively and efficiently. It helps in maintaining the desired temperature levels and avoiding complications such as flooding or starving of the evaporator, which can negatively impact system performance.