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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Aixiang Xu & Mengjin Xu & Nan Xie & Yawen Xiong & Junze Huang & Yingjie Cai & Zhiqiang Liu & Sheng Yang, 2021. "Thermodynamic Analysis of a Hybrid System Coupled Cooling, Heating and Liquid Dehumidification Powered by Geothermal Energy," Energies, MDPI, vol. 14(19), pages 1-21, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:19:p:6084-:d:642051
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    References listed on IDEAS

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    Cited by:

    1. Xu, Aixiang & Wang, Yizhang & Song, Tingting & Xiong, Yawen & Liu, Zhiqiang & Yang, Sheng, 2023. "Emergy evaluation of a solar-powered cascade system for dehumidification, cooling and heating in hot summer and cold winter areas of China," Energy, Elsevier, vol. 278(PB).
    2. Maragna, Charles & Altamirano, Amín & Tréméac, Brice & Fabre, Florent & Rouzic, Laurène & Barcellini, Pierre, 2024. "Design and optimization of a geothermal absorption cooling system in a tropical climate," Applied Energy, Elsevier, vol. 364(C).

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