Thermodynamic Analysis of a Hybrid System Coupled Cooling, Heating and Liquid Dehumidification Powered by Geothermal Energy

Aixiang Xu, Mengjin Xu, Nan Xie, Yawen Xiong, Junze Huang, Yingjie Cai, Zhiqiang Liu and Sheng Yang
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Aixiang Xu: School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China
Mengjin Xu: School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China
Nan Xie: School of Energy Science and Engineering, Central South University, Changsha 410083, China
Yawen Xiong: School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China
Junze Huang: School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China
Yingjie Cai: School of Civil Engineering, Hunan University of Technology, Zhuzhou 412007, China
Zhiqiang Liu: School of Energy Science and Engineering, Central South University, Changsha 410083, China
Sheng Yang: School of Energy Science and Engineering, Central South University, Changsha 410083, China

Energies, 2021, vol. 14, issue 19, 1-21

Abstract: The utilization of geothermal energy is favorable for the improvement of energy efficiency. A hybrid system consisting of a seasonal heating and cooling cycle, an absorption refrigeration cycle and a liquid dehumidification cycle is proposed to meet dehumidification, space cooling and space heating demands. Geothermal energy is utilized effectively in a cascade approach. Six performance indicators, including humidity efficiency, enthalpy efficiency, moisture removal rate, coefficient of performance, cooling capacity, and heating capacity, are developed to analyze the proposed system. The effect of key design parameters in terms of desiccant concentration, air humidity, air temperature, refrigeration temperature and segment temperature on the performance indicators are investigated. The simulation results indicated that the increase of the desiccant concentration makes the enthalpy efficiency, the coefficient of performance, the moisture removal rate and the cooling capacity increase and makes the humidity efficiency decrease. With the increase of air humidity, the humidity efficiency and moisture removal rate for the segment temperatures from 100 to 130 °C are approximately invariant. The decreasing rates of the humidity efficiency and the moisture removal rate with the segment temperature of 140 °C increases respectively. Six indicators, except the cooling capacity and heating capacity, decrease with an increase of air temperature. The heating capacity decreases by 49.88% with the reinjection temperature increasing from 70 to 80 °C. This work proposed a potential system to utilize geothermal for the dehumidification, space cooling and space heating effectively.

Keywords: geothermal energy; absorption refrigeration cycle; liquid dehumidification cycle; seasonal heating and cooling cycle; enthalpy efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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