Simplified Method for Night Sky Radiation Analysis in a Cool-Pool System

Alibakhsh Kasaeian^1, , Mohammad Sameti¹ and Amin Toghi Eshghi¹

¹Department of Renewable Energies, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran

Cite this paper:
Alibakhsh Kasaeian, Mohammad Sameti and Amin Toghi Eshghi. Simplified Method for Night Sky Radiation Analysis in a Cool-Pool System. Sustainable Energy. 2014; 2(1):29-34. doi: 10.12691/rse-2-1-6

Abstract

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.

Keywords:
building passive cooling night sky radiation cooling cool-pool

This work is licensed under a Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

References:

[1]	Kolokotsa, D., Rovas, D., Kosmatopoulos, E., Kalaitzakis, K. (2011). A roadmap towards intelligent net zero- and positive-energy buildings. Solar Energy. Volume 85. Issue 12. Pages 3067-3084.
[2]	Pacheco, R., Ordóñez, J., & Martínez, G. (2012). Energy efficient design of building: A review. Renewable and Sustainable Energy Reviews, 16 (6), 3559-3573.
[3]	Sameti, M., Kasaeian, A., & Astaraie, F. R. (2014). Simulation of a ZEB Electrical Balance with aHybrid Small Wind/PV. Science and Education, 2 (1), 5-11.
[4]	Leo Samuela, D. G., Shiva Nagendrab, S. M., Maiyaa, M. P. (2013). Passive alternatives to mechanical air conditioning of building: A review. Building and Environment. Volume 66. Pages 54-64.
[5]	Bagiorgas, H. S., & Mihalakakou, G. (2008). Experimental and theoretical investigation of a nocturnal radiator for space cooling. Renewable Energy, 33 (6), 1220-1227.
[6]	Halacy, D. (1986). Understanding passive cooling systems. Virginia, USA: Volunteers in Technical Assistance (VITA).
[7]	Spanakia, A., Tsoutsosb, T., Kolokotsab, D. (2011). On the selection and design of the proper roof pond variant for passive cooling purposes. Renewable and Sustainable Energy Reviews. Volume 15. Pages 3523-3533.
[8]	Goforth, M. A., Gilcrest, G. W., Sirianni, J. D. (2002). Cloud effects on thermal downwelling sky radiance. Proc. SPIE 4710.
[9]	Melchor Centeno, V. (1982). New formulae for the equivalent night sky emissivity. Solar Energy. vol. 28. No. 6. pp. 489-498.
[10]	Berdahl, P., & Martin, M. (1984). Emissivity of clear skies. Solar Energy. Volume 32. No. 5. Pages 663-664.
[11]	Chen B., Clark D., Maloney J., Ning Mei W., and Kasher J. Measurement of night sky emissivity in determining radiant cooling from cool storage roofs and roof ponds. Proceedings of the National Passive Solar Conference, vol. 20, pp. 310-313. AMERICAN SOLAR ENERGY SOCIETY INC, 1995.
[12]	Luciuk, M. (2012). Night radiative cooling: the effect of clouds and Relative Humidity. Tech. Print. Retrieved from www.asterism.org/tutorials/tut37%20Radiative%20Cooling. pdf.
[13]	Cengel, Y. (2008). Introduction to Thermodynamics and Heat transfer. USA: McGrawHill.
[14]	www.wunderground.com/history/airport/OIFM/2013/8/1/DailyHistory.html.