How does insufficient condenser water flow affect chiller operation and efficiency?

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If the condenser cooling water flow is insufficient, the condenser cannot remove heat from the refrigerant effectively. That means the refrigerant leaves the compressor and enters the condenser at a higher temperature and pressure because the heat isn’t being carried away fast enough. With a higher condensing pressure, the compressor has to work harder to push the refrigerant through the system, which increases power consumption and reduces the overall efficiency (COP) of the cycle. The elevated pressure and poorer heat rejection also raise the risk of overheating and can push the control system toward shutdown to protect the equipment. So, low condenser water flow leads to higher condenser pressure, poorer heat rejection, lower COP, and potential shutdown or overheating. The evaporator isn’t the primary point of failure here—the issue stems from the condenser’s reduced ability to reject heat due to insufficient water flow.