Space cooling using geothermal single-effect water/lithium bromide absorption chiller,Energy Science & Engineering

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Space cooling using geothermal single-effect water/lithium bromide absorption chiller
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2021-07-15 , DOI: 10.1002/ese3.946
Mamdouh El Haj Assad ₁ , Milad Sadeghzadeh ₂ , Mohammad Hossein Ahmadi ₃ , Mohammad Al‐Shabi ₄ , Mona Albawab ₁ , Amjad Anvari‐Moghaddam ₅ , Ehab Bani Hani ₆

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This research is proposed to fully investigate the performance of a single-effect water/lithium bromide absorption chiller driven by geothermal energy. Since absorption cycles are considered as low-grade energy cycles, this innovative idea of rejecting fluid from a single-flash geothermal power plant with low-grade energy would serve as efficient, economical, and promising technology. In order to examine the feasibility of this approach, a residential building which is located in Sharjah, UAE, considered to evaluate its cooling capacity of 39 kW which is calculated using MATLAB software. Based on the obtained cooling load, modeling of the required water/lithium bromide single-effect absorption chiller machine is implemented and discussed. A detailed performance analysis of the proposed model under different conditions is performed using Engineering Equation Solver software (EES). Based on the obtained results, the major factors in the design of the proposed system are the size of the heat exchangers and the input heat source temperature. The results are presented graphically to find out the geofluid temperature and mass flow and solution heat exchanger effectiveness effects on the chiller thermal performance. Moreover, the effects of the size of all components of the absorption chiller on the cooling load to meet the space heating are presented. The thermal efficiency of the single-flash geothermal power plant is about 13% when the power plant is at production well temperature 250℃, separator pressure 0.24 MPa, and condenser pressure 7.5 kPa. The results show that the coefficient of performance (COP) reaches about 0.87 at solution heat exchanger effectiveness of 0.9, when the geofluid temperature is 120℃.

中文翻译：

使用地热单效水/溴化锂吸收式制冷机的空间冷却

本研究旨在全面研究由地热能驱动的单效水/溴化锂吸收式制冷机的性能。由于吸收循环被认为是低品位能源循环，这种从低品位能源的单闪地热发电厂中排除流体的创新想法将成为高效、经济和有前途的技术。为了检验这种方法的可行性，位于阿联酋沙迦的一栋住宅楼考虑评估其使用 MATLAB 软件计算的 39 kW 的冷却能力。基于获得的冷负荷，实现并讨论了所需的水/溴化锂单效吸收式冷水机组的建模。使用工程方程求解软件 (EES) 对不同条件下提出的模型进行了详细的性能分析。根据获得的结果，所提出的系统设计中的主要因素是换热器的尺寸和输入热源温度。结果以图形方式呈现，以找出地质流体温度和质量流量以及溶液换热器有效性对冷却器热性能的影响。此外，还介绍了吸收式制冷机所有组件的尺寸对满足空间供暖的冷负荷的影响。单闪地热电厂在生产井温250℃、分离器压力0.24 MPa、冷凝器压力7.5 kPa时，热效率约为13%。

更新日期：2021-07-15

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