Optimal design of solar CHP system based on ORC

 Proposes a solar CHP system based on organic Rankine cycle (ORC) to meet the energy demand of the small building communities in remote regions with abundant solar energy resources, which collects solar energy by evacuated tube solar collector, and generates electricity through the ORC system, then transfers the surplus heat to heat network. Develops a mathematical model for the system and validates it by experiments. Taking a sentry post as an example, establishes an optimal system model with the orthogonal optimization method, takes the minimum annual cost as the objective function, and covers design variables of solar collector area, heat storage tank volume, evaporator heat exchange area, condenser heat exchange area, battery capacity and generator activated pressure difference. The equivalent power price of the optimal combination is 2.3 Yuan/kWh, and it achieves free heating. Conducts the hourly operation simulation during the whole year. The results show that the system takes 94.56% of electrical load and 100% of heating load, 5.44% of electrical load is by the diesel generator of the auxiliary energy system. Evaluates the superiority of the system from the aspects of economy, environmental protection and reliability.