Refrigerant flows through coil pipeline and generates pressure drop. Pressure difference changes saturation temperature along the flow path inside evaporator. Higher pressure drop creates temperature gradient from coil inlet to outlet. Part of coil works at higher saturation temperature and loses cooling potential. Xindacool optimizes coil pipe layout and branch channel design to control internal pressure drop within acceptable range. Long, narrow and twisted coil pipes increase pressure loss. Such structure also raises required pumping power for refrigerant circulation. Pressure drop becomes more obvious under high load when refrigerant mass flow rises. Low load condition brings smaller pressure difference. Excessive pressure drop increases compressor discharge requirement. Compressor consumes extra power to push refrigerant through coil. When evaluating evaporator performance, pressure drop must be measured. It is often overlooked while checking superheat and temperature. Oil fouling or internal debris inside tube narrows flow passage and enlarges pressure drop gradually over years of service. Multi-circuit coil with poor flow balance also appears as higher overall pressure drop across evaporator. During commissioning, compare measured pressure difference with factory datasheet. Large deviation indicates internal flow restriction. Pipe inlet and outlet connection design also contributes to pressure loss. Sharp elbows create more flow resistance than smooth bends.
Q: What is refrigerant pressure drop inside evaporator coil? A: Pressure difference generated when refrigerant flows through coil pipelines. Q: What consequence of excessive coil pressure drop? A: Saturation temperature changes along coil, cooling capacity reduces and compressor power rises. Q: When does pressure drop reach higher value? A: Under high thermal load with large refrigerant mass flow through coil. Q: What will increase pressure drop gradually in long run? A: Internal oil fouling or solid debris that narrows pipe flow cross-section. Q: How to judge abnormal pressure drop on site? A: Compare measured pressure difference with original factory performance datasheet. Q: Why smooth bends are preferred over sharp elbows? A: Sharp elbows create higher local flow resistance and add extra pressure loss. Q: Can unbalanced multi-circuit flow increase overall pressure drop? A: Yes, uneven refrigerant distribution raises total pressure loss of coil assembly. Q: What parameter is affected by saturation temperature shift caused by pressure drop? A: The heat transfer temperature difference between coil surface and cold air.
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