Research On Combined Cooling Heating And Power System Driven By Solar Energy And Biomass Energy

In China’s energy structure,it is too dependent on the three fossil energy sources,which has aggravated the contradiction between the environment and the economy.In response to the idea that “lucid waters and lush mountains are invaluable assets”,the transformation of energy structure is imperative.This paper combines two renewable energy sources and proposes a combined cooling,heating and power(CCHP)system driven by solar energy and biomass energy,which provides some new ideas for promoting the rational transformation of China’s energy structure.Firstly,the integration of CCHP system driven by solar and biomass energy is based on the principle of energy cascade utilization.Using solar energy as an external heating source to drive biomass-steam gasification,a sub-model of solar thermochemical reactor was established.In the CCHP sub-model,the generated gases are used as fuel gas of the CCHP system,and the residual heat of the internal combustion engine is recycled through the waste heat absorption type hot and cold water unit.Secondly,the thermodynamic performance analysis of the combined cooling,heating and power system with solar energy and biomass energy is carried out.Based on the first law of thermodynamics and the second law of thermodynamics,the energy loss and exergy loss distribution of each unit of the system under design conditions are analyzed and thermodynamic performance of the system in summer and winter under variable operating conditions(electric load rate,solar radiation).Finally,the thermodynamic performance analysis of the solar energy and biomass energy complementary CCHP system is carried out.Applying the method of cost allocation based on energy level to analyze the system,the unit exergy cost and the factors affecting the unit exergy cost(biomass fuel price,non-energy cost,etc.)of the three major outputs are studied.The method of reducing the unit cost is obtained,which makes the economic analysis of the system more perfect.