The Improvement of Energy Efficiency for Refrigeration System in Thailand Convenience Store by Digital Scroll Compressor

Abstract

In this research will present energy saving of R448A refrigeration system in convenience stores 150 m2 by digital scroll compressor that energy used 40,997 kWh/Year/Store replaced for fix speed scroll compressor that energy used 62,364 kWh/Year/Store. The digital scroll compressor can operated in unload status and full load status that controlled by evaporator temperature (Tev) set point at -10 degree and condenser temperature (Tcd) set point at 38 degree and superheat temperature (Tsh) at 10 degree, in unload status the power consumption for digital scroll compressor will decreased 50% that impact for energy saving and important for night time when low requested cooling load because compressor started–stopped many time. The methodology was measured power consumption (W), voltage (V), current (I), power factor (PF), frequency (Hz), evaporator temperature (Tev), condenser temperature (Tcd), liquid temperature (Tlq), sub cool temperature (Tsc), gas temperature (Tg), superheat temperature (Tsh) by power meter data logger and temperature data logger. The result summarized relation of all parameter and showed energy saving 34%, 21,367 kWh/Year/Store of compressor.