eng Science and Education Publishing Sustainable Energy 2014-02-06 2 1 29 34 10.12691/rse-2-1-6 RSE2014216 article Alibakhsh Kasaeian akasa@ut.ac.ir 1 Mohammad Sameti 1 Amin Toghi Eshghi 1 Department of Renewable Energies, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran The conventional mechanical building cooling systems are energy demanding equipment. Needing for low-energy consumption systems is a motivation for utilizing ambient energy resources such as ground, ambient air, sky and water as alternative resources. Night sky can be a good candidate as a heat sink to be used in cooling systems. The present study proposes and presents a simplified method for computing net outgoing energy exchanged between night sky and a cool-pool in a building cooling system. Considering a real night condition with a 3 m × 4 m pool and overall energy conversion efficiency of 75%, we obtained that the aforementioned system can replace a 4000 watts swamp cooler works for 6 hours a day. http://pubs.sciepub.com/rse/2/1/6/rse-2-1-6.pdf building passive coolingnight sky radiation coolingcool-pool