Integrated Energy Management System in SupermarketAssuming Utilization of Exhaust Heat for Subcooling by PCM to Achieve Sustainable Cities and Communities

Abstract

In this study, we focused on the way of waste heat utilization to subcooling into refrigerated cabinets by cold heat of PCM (Phase Change Material) in the case of supermarket fields. On this experiment, we installed a heat exchanger into after the condenser of the refrigerated cabinet to control the subcooling degree using the PCM cold storage tank. The cold heat capacity of PCM tank water for subcooling was set assuming that it was supplied by adsorption refrigerator which was driven by the exhaust heat from gas engine and solar energy absorber. As a result, we confirmed that the power consumption decreased in the case of the refrigerated cabinet with subcooling contributed to CO2 emission reduction. Result of this experiment, the utilization of exhaust heat for subcooling by PCM was effective for energy conservation on the summer and the intermediate season. We confirmed, on the other hand, that the effect of subcooling by PCM could be disappeared when it was below 16 degree Celsius of the outside temperature.