Abstract
This paper aims to present a comparative study into the cascade and series configurations of the organic Rankine cycle based small-scale solar combined cooling, heating and power system for civil application. The energy performance of the systems is studied by developing a thermodynamic model. The simulation model is validated using the literature results. Analyses of the research results indicated that the cascade system can achieve maximum value of the primary energy efficiency of 13.4% for cooling and power generation under solar collecting temperature of 115 °C in cooling mode. The cascade system has more cooling output and less electricity output in cooling mode compared with the series system. In heating mode, the single solar organic Rankine cycle (ORC) operation can achieve highest primary energy efficiency of 19.6% for heating and power generation under solar collecting temperature of 100 °C. Systems with R141b as ORC working fluid show better performance than those with R123 and R1233zd(E).
Highlights
Building sectors consumed a large amount of non-renewable energy resources
The cascade system has more cooling output and less electricity output in cooling mode compared with the series system
Fuel cell, steam turbine or organic Rankine cycle (ORC) is usually used for power generation while absorption or adsorption chiller is used for cooling generation
Summary
Building sectors consumed a large amount of non-renewable energy resources. Regarded as one of the most feasible renewable solutions for the building application, solar thermal technology is proven to be the most mature technology among all currently available solar technologies, for meeting building’s electricity and hot water demand. Solar thermal driven combined cooling, heating and power systems (CCHP) can simultaneously produce multiple energy (electricity, heating and cooling) to meet building’s multi-energy demands. In these systems, fuel cell, steam turbine or organic Rankine cycle (ORC) is usually used for power generation while absorption or adsorption chiller is used for cooling generation. Zare et al [5] carried out thermoeconomic analysis and optimization of an ammonia-water power/cooling cogeneration cycle They found that the sum of the unit costs of the products is reduced by about 18.6% for the cost optimal design compared to that of the thermal efficiency optimal design
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