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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2018020247
pages 473-491

PERFORMANCE AND ECONOMICS OF A SOLAR DESICCANT AIR CONDITIONING SYSTEM FOR COOLING AN INSULATED GREENHOUSE IN TUNISIA

Amel Rjibi
Research and Technology Center of Energy, Thermal Processes Laboratory, Hammam Lif, B.P. 95, 2050 Tunis, Tunisia
Sami Kooli
Research and Technology Center of Energy, Thermal Processes Laboratory, Hammam Lif, B.P. 95, 2050 Tunis, Tunisia
Ridha Chargui
Research and Technology Center of Energy, Thermal Processes Laboratory, Hammam Lif, B.P. 95, 2050 Tunis, Tunisia
Amen Allah Guisani
Research and Technology Center of Energy, Thermal Processes Laboratory, Hammam Lif, B.P. 95, 2050 Tunis, Tunisia

ABSTRACT

This work highlights the cooling potential of a desiccant evaporative cooling (DEC) cycle for an insulated greenhouse with a surface area of 300 m2. DEC is assimilated in a closed loop that is comprised of several greenhouse components, including a flat plate collector, desiccant wheel, heat exchanger, and evaporative coolers. The system cools and dehumidifies the air without using conventional harmful refrigerants. We insert our experimental data in to a numerical model based on a transient system simulation program and analyze the feasibility of the solar DEC system. Our results show that the best performance of the system (coefficient of performance COPel = 14; COPth = 0.94) is obtained using 60°C regeneration temperature and a supply/regeneration flow ratio of 0.2. The system reduces inside temperature by 6°C in comparison to a conventional system, and the increased electricity permits an increase of cost for 25 years as viewing time.


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