Economical Assessment And Energetic, Economic And Environmental(3E) Design Of Solar Absorption-subcooled Compression Hybrid Cooling System

With the rapid development of economy and people’s pursuit of high-quality work and life,the number of high-rise buildings increases year by year,and the proportion of energy consumption by the cooling system is increasing.Solar absorption-subcooled compression hybrid cooling system（SASCHCS）is a new device for reducing energy consumption in high-rise buildings.At present,the research on this unit mainly focuses on the thermodynamic simulation analysis.It is not evaluated economically and environmentally.Besides,the rated cooling capacity of absorption subsystem in the SASCHCS is difficult to be designed in the whole working period due to the difference of monthly meteorological data.And the annual performance of hybrid system deteriorates seriously when the size of absorption subsystem is designed improperly.Consequently,the paper mainly contributes to the above-mentioned study to show the potential of SASCHCS.The evaluation,performing by the quasi-static simulation based on the monthly typical cooling demand and meteorological data,is by the comparison of SASCHCS and the solar PV cooling which is thought to be the most economical solution recently.Accordingly,the effect of nominal cooling capacity in the absorption subsystem on the annual performance of SASCHCS is assessed by the means of energy,economic and environmental analysis.The corresponding model is developed.Additionally,the annual total energy saving,payback period,net present value and CO₂ emissions for different sizes of absorption subsystem are calculated and analyzed.It is found that the SASCHCS is slightly economically better than the solar PV cooling system.The payback period is 20.3 years and 20.4 years respectively.The net present value of the SASCHCS is 50%higher than that of the solar PV cooling system.In addition,the economical efficiency of SASCHCS is greatly influenced by equipment price,the performance of compression system and electricity price.While the economical efficiency of solar photovoltaic refrigeration system is only affected by PV plate price and electricity price.Besides,the SASCHCS becomes more economical and attractive as the performance of its compression subsystem is poor.The payback period of SASCHCS drops to 17.6 yr when the performance of compression subsystem comes down by 20%.The rated cooling capacity of the absorption subsystem impact of the SASCHCS is analyzed for the annual performance.It is found that the size of absorption chiller in the SASCHCS should be designed according to the meteorological data of May whose solar irradiance is medium.The rated cooling capacity of absorption subsystem should be designed as 50 k W according to the maximum energy saving and the minimum CO₂ emissions.And it turns to be 47 kW based on the least payback period as well as the highest net present value.This paper is helpful to improve the performance of SASCHCS in the whole operational period and promote the application of SASCHCS.