Open AccessSpace cooling using geothermal single‐effect water/lithium bromide absorption chiller
Author(s) -
El Haj Assad Mamdouh,
Sadeghzadeh Milad,
Ahmadi Mohammad Hossein,
AlShabi Mohammad,
Albawab Mona,
AnvariMoghaddam Amjad,
Bani Hani Ehab
Publication year - 2021
Publication title -
energy science and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 29
ISSN - 2050-0505
DOI - 10.1002/ese3.946
Subject(s) - chiller , absorption refrigerator , coefficient of performance , nuclear engineering , geothermal power , renewable energy , lithium bromide , waste heat , process engineering , water chiller , geothermal energy , pressure drop , chilled water , environmental science , heat exchanger , cooling load , condenser (optics) , mechanical engineering , geothermal gradient , thermodynamics , engineering , water cooling , heat pump , refrigerant , electrical engineering , refrigeration , air conditioning , physics , light source , optics , geophysics
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℃.