Abstract
The purpose of this paper is to improve the utilization of renewable energy by exergy and exergoeconomic analysis of the novel combined cooling, heating, and power (CCHP) system, which is based on solar thermal biomass gasification. The source of heat to assist biomass and steam gasification is the solar heat collected by a dish collector, and the product gas being fuel that drives the internal combustion engine to generate electricity and then to produce chilled/hot water by a waste heat unitization system. The analysis and calculation of the exergy loss and exergy efficiency of each component reveal the irreversibility in the heating and cooling conditions. Then, the exergoeconomic costs of multi-products such as electricity, chilled water, heating water, and domestic hot water are calculated by using the cost allocation method based on energy level. The influencing factors of the unit exergy cost of products are evaluated by sensitivity analysis, such as initial investment cost, biomass cost, service life, interest rate, and operating time coefficient. The results reveal that the internal combustion engine takes up 49.2% of the total exergy loss, and the most effective method of products cost allocation is the exergoeconomic method based on energy level and conforms to the principle of high energy level with high cost.
Highlights
Combined cooling, heating, and power (CCHP) systems are extensively considered to be a highly efficient distributed energy system that conforms to the energy cascade utilization to improve performance and mitigate energy and environmental problems
Than the simple complementary, solar energy fuel needed by the CCHP system is obtained by the biomass gasification reaction of solar energy, which is commonly referred to as solar thermochemical utilization with the higher temperature of the solar
The fuel used in the CCHP system is the wheat straw
Summary
Combined cooling, heating, and power (CCHP) systems are extensively considered to be a highly efficient distributed energy system that conforms to the energy cascade utilization to improve performance and mitigate energy and environmental problems. Clean or renewable energy technologies are largely integrated with CCHP systems to further improve energy sustainability development [1]. Biomass and solar energies resources, which belong to clean energy, have attracted extensive attention of the researchers due to their renewability and huge potential [2,3,4]. The purpose of a solar vacuum collector in the biomass CCHP system is only to collect solar energy, which is used to compensate for the lack of heat in the absorption cooling and heating [5]. Than the simple complementary, solar energy fuel needed by the CCHP system is obtained by the biomass gasification reaction of solar energy, which is commonly referred to as solar thermochemical utilization with the higher temperature of the solar.
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