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Title: Design and energy analysis of a solar desiccant evaporative cooling system with built-in daily energy storage
Authors: Riaz, F
Qyyum, MA
Bokhari, A
Klemeš, JJ
Usman, M
Asim, M 
Awan, MR
Imran, M
Lee, M
Issue Date: May-2021
Source: Energies, May 2021, v. 14, no. 9, 2429
Abstract: Heat storage with thermochemical (TC) materials is a promising technology for solar energy storage. In this paper, a solar-driven desiccant evaporative cooling (DEC) system for air-conditioning is proposed, which converts solar heat energy into cooling with built-in daily storage. The system utilises thermochemical heat storage along with the DEC technology in a unique way. Magnesium Chloride (MgCl2·6H2O) has been used, which serves as both a desiccant and a thermochemical heat storage medium. The system has been designed for the subtropical climate of Lahore, Pakistan, for a bedroom with 8 h of cooling requirements during the night. MATLAB has been employed for modelling the system. The simulation results show that 57 kg of magnesium chloride is sufficient to meet 98.8% of cooling demand for the entire month of July at an elevated cooling requirement. It was found that the cooling output of the system increased with increasing heat exchanger effectiveness. The heat exchangers’ effectiveness was increased from 0.7 to 0.8, with the solar fraction increased from 70.4% to 82.44%. The cooled air supplied to the building meets the fresh air requirements for proper ventilation.
Keywords: Air conditioning
Cooling
Desiccant
Energy storage
Evaporative
Refrigeration
Solar
Publisher: Molecular Diversity Preservation International (MDPI)
Journal: Energies 
EISSN: 1996-1073
DOI: 10.3390/en14092429
Rights: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
The following publication Riaz, F.; Qyyum, M.A.; Bokhari, A.; Klemeš, J.J.; Usman, M.; Asim, M.; Awan, M.R.; Imran, M.; Lee, M. Design and Energy Analysis of a Solar Desiccant Evaporative Cooling System with Built-In Daily Energy Storage. Energies 2021, 14, 2429 is available at https://doi.org/10.3390/en14092429
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