The present study develops a cooling system using water as the working medium which is cooled at night by cellulose-pad cooling tower (CWCT) and stored for cooling application at daytime. That is, it utilizes the natural energy drawn from diurnal ambient air temperature difference. A cooling system was built and tested. It is found that the coefficient of performance of CWCT for heat dissipation of water at night, COPnt, is between 3.8 and 11 and varies linearly with the evaporation temperature glide DG (difference between cold water temperature in the storage tank and wet-bulb temperature of ambient air). The COP for room cooling at daytime run with air cooler in a room, COPday, is between 8.8 and 12.6. For day cycle operation, the measured overall cooling COPo is 5.1. COPo is expected to reach 9.4 at room temperature 45 °C.
|Original language||English (US)|
|Number of pages||11|
|Journal||INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID|
|State||Published - Jul 14 2016|
Bibliographical noteKAUST Repository Item: Exported on 2022-06-02
Acknowledged KAUST grant number(s): KUK-C1-014-12
Acknowledgements: This study was supported by Grant No. NSC100-2221-E-002-212-MY2 made by Ministry of Science and Technology, Taiwan, and by Award No. KUK-C1-014-12 made by King Abdullah University of Science and Technology (KAUST), Saudi Arabia.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.