Performance Analysis of a Wastewater Source Plant Serving as both a Water Chiller and a Heat Pump with Different Working Substance

The paper introduces in brief the working principle of a wastewater source plant serving as both a water chiller and a heat pump and the property of wastewater,and elaborates on the exergy efficiency of the plant and the exergy destroy of its main units as well as the calculating formula of its primary energy utilization rate in refrigeration and heat pump operating conditions,then makes an analysis and comparisons on the exergy efficiency,COP value and primary utilization rate of the plant with different temperature wastewater sources in summer refrigeration and winter heating,at last the paper concludes that R407C is the ideal working substance of wastewater source heating pumps.