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Using Hybrid System of Ground Heat Exchanger and Evaporative Cooler in Arid Weather Condition

Authors: Vahid Khalajzadeh, Ghassem Heidarinejad

Abstract:

In this paper, the feasibility study of using a hybrid system of ground heat exchangers (GHE) and direct evaporative cooling system in arid weather condition has been performed. The model is applied for Yazd and Kerman, two cities with arid weather condition in Iran. The system composed of three sections: Ground- Coupled-Circuit (GCC), Direct Evaporative Cooler (DEC) and Cooling Coil Unite (CCU). The GCC provides the necessary precooling for DEC. The GCC includes four vertical GHE which are designed in series configuration. Simulation results show that hybridization of GCC and DEC could provide comfort condition whereas DEC alone did not. Based on the results the cooling effectiveness of a hybrid system is more than unity. Thus, this novel hybrid system could decrease the air temperature below the ambient wet-bulb temperature. This environmentally clean and energy efficient system can be considered as an alternative to the mechanical vapor compression systems.

Keywords: Computational Fluid Dynamics (CFD), Cooling CoilUnit (CCU), Direct Evaporative Cooling (DEC), Ground CoupledCircuit (GCC)

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1073443

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References:


[1] V.C Mei, C.J Emerson, New approach for analysis of ground-coil design for applied heat pump system, ASHRAE Transaction 1985; 91: 1216- 24.
[2] N.K Muraya, D.L O-Neal, W.M Heffington Thermal interference of adjacent legs in vertical U-tube heat exchanger for a ground-coupled heat pump. ASHRAE Transaction 1996; 102: 12-21.
[3] S.P Rottmayer, W.A Beckman, J.W Mitchell. Simulation of a single vertical U-tube ground heat exchanger in an infinite medium. ASHRAE Transaction 1997; 103: 651-59.
[4] P. Cui, H. Yang, Z. Fang, Numerical analysis and experimental validation of heat transfer in ground heat exchangers in alternative operation modes. Energy and Buildings 2008; 40: 1060-66.
[5] C.K Lee, H.N Lam, Computer simulation of borehole ground heat exchangers for geothermal heat pump systems. Renewable Energy 2008; 33: 1286-96.
[6] Z. Li, M. Zheng, Development of a numerical model for the simulation of vertical U-tube ground heat exchangers. Applied Thermal Engineering 2009; 29: 920-24.
[7] C. Yavuzturk, Modeling of Vertical Ground Loop Heat Exchangers for Ground Source Heat Pump Systems. Doctoral thesis, Oklahoma State University; 1999.
[8] A. Gasparella, G.A Longo, R. Marra, Combination of ground source heat pumps with chemical dehumidification of air. Applied Thermal Engineering 2005; 25 (2-3): 295-308.
[9] O. Ozgener, A. Hepbasli, An economical analysis on a solar greenhouse integrated solar assisted geothermal heat pump system. Journal of Energy Resources Technology 2006; 128(1): 28-34.
[10] A.D Chiasson, C. Yavuzturk, Assessment of the viability of hybrid geothermal heat pump systems with solar thermal collectors. ASHRAE Transactions 2003; 109 (2): 487-500.
[11] C.K Lee, H.N Lam, Computer simulation of ground-coupled liquid desiccant air conditioner for sub-tropical regions, International Journal of Thermal Sciences 2009; 48: 2365-74.
[12] G. Heidarinejad, M. Bozorgmehr, S. Delfani, J. Esmaeelian, Experimental investigation of two-stage indirect/direct evaporative cooling system in various climatic conditions. Building and Environment 2009; 44: 2073-79.
[13] G. Heidarinejad, V. Khalajzadeh, S. Delfani, Performance analysis of a ground assisted direct evaporative cooling air conditioner, Building and Environment 45 (10) (2010) 2327-2335..
[14] G Heidarinejad, M Heidarinejad, S. Delfani, J. Esmaeelian, Feasibility of using various kinds of cooling systems in a multi-climates country. Energy and Buildings 2008; 40: 1946-53
[15] T. Kusuda, P.R Archenbach, Earth temperature and thermal diffusivity at selected stations in the United States, ASHRAE Transaction 1965; 71(1):61-74.
[16] S.K Wang, Handbook of air conditioning and refrigeration, Second edition, McGraw-Hill; 2001
[17] P.W Dittus, L.M.K Boelter, Heat transfer in automobile radiators of the tubular type. Heat Mass Transfer 1985; 12: 3-22.
[18] A.A Zukauskas, Heat transfer from tubes in cross Flow. Adv. Heat Transfer; 1972; 8: 93-160.
[19] A. Bejan, Heat Transfer, Wiley; 1993.
[20] J.A Dowdy, N.S Karabash, Experimental determination of heat and mass transfer coefficients in rigid impregnated cellulose evaporative media. ASHRAE Transaction 1987; 93 (Part 2): 382-395.