Solar assisted CCHP system, energetic, economic and environmental analysis, case study: Educational office buildings

Abstract

Combined cooling, heating, and power (CCHP) systems have been attracted substantial interest during the last years due to their higher efficiency and their cost benefits while reducing greenhouse gases. With regard to the need for less pollutant and more efficient energy generation technologies, solar assisted combined cooling, heating and power (SCCHP) system in office buildings in Iran is studied. Four operational strategies, following electrical load (FEL), following thermal load (FTL), cooling demand hybrid supply and an optimization model are studied in order to find optimum equipment size. Results of hourly thermodynamic simulation, for one typical day in summer and one in winter show that overall system efficiency can reach up to 89% in summer considering FEL mode and CO2 emission production can be reduced by 2217kg/day in winter considering optimization model. The optimization model can reduce proposed system daily cost up to 69% in comparison to other strategies, but daily cost of the proposed system in all strategies is more than conventional system.