Optimal design method for primary energy cascade utilization in a district energy system

Taking a district energy system of a business district in Shanghai as an example, presents the district cooling and heating system, gas combined cooling heating and power system (gas CCHP), auxiliary cooling and heating system and energy storage system. Elaborates the air-source and water-source heat pumps cascade heating system, low temperature waste heat recovery and utilization system, and analyses the total system investment, operational efficiency and operating costs. Principles of the design is the self-generated power for self-use as priority and secondly for on-grid sale and to maximize the utilization of exhaust heat by recycling the exhaust heat through water-source heat pump, so as to realize the maximum effect of energy cascade utilization, and remarkable success in energy saving and emission reduction.