Design Method and Performance Analysis of CCHP Driven by Solar Energy and Based on Organic Rankine Cycle

Abstract

Under the new decoupling development pattern of economic development and environmental pollution, combined cooling, heating and power system (CCHP) using renewable energy sources such as solar energy has become a hot spot. Integrated with solar energy, a CCHP system which can meet cooling load in summer, provide heat in winter and supply electricity throughout the year is investigated. The system contains a parabolic trough collector (PTC) circuit, a heat storage tank, an auxiliary boiler, an organic Rankine cycle (ORC) and an absorption cooling system. A design method to determine the PTC area of the system, the capacity of the storage tank and the backup boiler is proposed, which can choose system energy efficiency, annual total cost or the coupling between efficiency and cost as evaluation criteria. Based on this method combined with a building simulation load, the capacity of the key components is determined using the evaluation criteria of coupling between efficiency and cost as an example. The sensitivity of design radiation, solar energy assurance rate and storage ratio were analyzed by using the above three evaluation criteria. The result shows that, in order to optimize the three evaluation criteria, the solar energy assurance rate should increase as the design radiation increases.