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This paper presents the performance analysis of a window air conditioner unit incorporated with Wick less Loop Heat Pipes(WLHP).The WLHPs are located on the evaporator side of the air conditioning unit. The working medium for the WLHPs is R134a refrigerant gas, an alternate refrigerant. The supply and return humidity of room air, the heat removal rat and, the COP (Coefficient of Performance) of the unit are analyzed for various ambient and room temperatures before and after incorporation of WLHPs. The performance curves are drawn by comparing the power consumption and humidity collection rates for various room and ambient temperatures. The results show that the COP of the unit is improved by 18% to 20% after incorporation of WLHPs due to pre cooling of return air by WLHPs, which reduces the thermal load on compressor. Similarly the energy consumption is reduced by 20% to 25% due to higher thermostat setting and the humidity collection is improved by 35% due to pre cooling effect of WLHPs. The results are tabulated and conclusion drawn is presented based on the performance.

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NETHAJI, Nagachari; THARVES MOHIDEEN, Sheik Ismail. EXPERIMENTAL STUDIES ON IMPROVEMENT OF COP OF WINDOW AIR CONDITIONING UNIT. Thermal Science, [S.l.], mar. 2017. ISSN 2334-7163. Available at: <http://thermal-science.tech/journal/index.php/thsci/article/view/2106>. Date accessed: 21 aug. 2017. doi: https://doi.org/10.2298/TSCI141215139T.
Received 2017-03-02
Accepted 2017-03-13
Published 2017-03-13


[1] Xiao ping Wu, Peter Johnson, Aliakbar kbarzadeh, Application of heat pipe heat exchanges to humidity control in air-conditioning systems, Applied thermal engineering 17(1997),6,pp.561- 568
[2] D Etheridge, K Murphy, D Reay, A PCM heat pipe cooling system for reducing air conditioning in buildings: review of options and report on field tests, Building services Engineering Research and Technology, 27, (2006),1, pp.27-39
[3] Mostafa A. Abd El-Baky , Mousa M.Mohamed, Experimental study of heat pipes heat exchanger for heat recovery in air conditioning applications, Ain Shams university, Cairo, Egypt, Scientific Bulletin, 40(2006),4, pp.1119-1136
[4] Yau Y.H., Experimental thermal performance study of an inclined heat pipe heat exchanger operating in high humid tropical HVAC systems, International Journal of refrigeration,30 (2007), pp.1143-1152
[5] Hussam jouhara, Richard Meskimmon, Experimental investigation of wraparound loop heat pipe heat exchanger used in energy efficient air handling units, Energy,35(2010), pp. 4592-4599
[6] Supirattanakul S., Rittidech, Bubphachot B., Application of a closed-loop oscillating heat pipe with check valves (CLOHP/CV) on performance enhancement in air conditioning system ,Energy and Building,43(2011), pp.1531-1535
[7] M. Ahmadzadehtalatapeh, Yau Y.H., Energy conservation potential of the heat pipe heat Exchangers: experimental study and predications, International Journal of Engineering, 24 (2012), 3, pp.193-199
[8] Hussam jouhara, Hatem Ezzuddin, Thermal performance characteristics of a wraparound loop heat pipe (WLHP) charged with R134A, Energy (2012), pp.1-11
[9] Yau Y.H.,Foo Y.C., Comparative study on evaporator heat transfer characteristics of revolving heat pipes filled with R134A, R22 and R410, International Communications in Heat and Mass Transfer,38(2011), pp. 202-211
[10] Wan J.W.,Zhang J.L.,Zhang W.M., The effect of heat-pipe air-handling coil on energy consumption in central air-conditioning System, Energy and Buildings, 39(2007), pp.1035-1040
[11] Yau Y.H., The heat pipe exchanger: a review of its status and its potential for coolness recovery in tropical buildings, Building Services Engineering Research and Technology. 9(2008),4, pp. 291-310
[12] Yau Y.H., The use of a double heat pipe heat exchanger system for reducing energy consumption of treating ventilation air in an operating theatre - A full year energy consumption model simulation, Energy and Buildings,40(2008), pp.917-925
[13] Alklaibi A.M., Evaluating the possible configurations of incorporating the loop heat pipe into the Air conditioning systems, International Journal of refrigeration, 31(2008), pp.807-815