Experimental Investigation Of Solar Hybrid Desiccant Air .
Latest Trends in Renewable Energy and Environmental InformaticsExperimental Investigation of Solar Hybrid Desiccant AirConditioning System Using Heat Pipe Heat ExchangerZuraini Mohd Enggsa1,2,a, Arfidian Rachman1,b, M. Mehdi1,c, Sohif Mat1,d, Kamaruzzaman Sopian1e1Solar Energy Research Institute, Universiti Kebangsaan Malaysia,43600 UKM Bangi, Selangor,MALAYSIA.2aHeating, Ventilation and Air-Conditioning Department,University Kuala Lumpur- Malaysia France Institute,Bandar Baru Bangi, Malaysia 43650zurainimfi@yahoo.com, barfidian@yahoo.com, cmehdi@yahoo.com, ddrsohif@gmail.com,ek sopian@yahoo.comAbstract: In this study, experimental investigation of solar hybrid desiccant air-conditioning systemwas designed, fabricated and analysed under the humid and hot weather conditions of Malaysia. Inthe system, latent load is removed by the silica-gel solid desiccant wheel and cooling coil ofconventional vapour compression (VAC). Sensible heat load is removed by vertical heat pipe asreplacement of conventional heat recovery wheel. As a result of significant energy saving is recorded.Thermal unit was consisting of 120m2 evacuated tube (solar collector) and axillary heater is used.Supply air mass flow rate and regeneration air mass flow rate for the system were 0.028(kg/s) and0.120(kg/s) respectively. The COP, effectiveness of desiccant wheel, and heat pipe heat exchanger ofthe system are 0.6, 0.7 and 0.80 respectively. Therefore, output qualified supply air with 22 Ctemperature, and 7.7 (gr/kg) was achieved by using solar hybrid desiccant air-conditioning system inhot and humid weather of Malaysia.Keywords : desiccant cooling, heat pipe heat exchanger, solar thermal energy, hot and humid.conditioning systems. The application of HeatPipe Heat Exchanger offered majorimprovements in humidity control and overallefficiency(energy saving) when compared tothe usual practice of utilizing a speciallydesigned cooling coil in combination withreheat. Mathur (4) analyzed the performanceenhancement of an existing 5-ton(17.7kW) airconditioning system with an air-to-air twophase natural circulation heat recovery loopheat exchanger by simulation. It was foundthat the two-phase heat recovery loop wouldpay for itself in less than a year.Worek and Moon (5) have modeled theperformance of a desiccant integrated hybridvapour air conditioning system. The wasteheatINTRODUCTIONMalaysia is hot and humid country. In Unitedstates, K.R. Grosskorp reported that a lot ofdefect in buildings due to humidityproblems(1). Due to high humidity, it isrecomemended that tropical HVAC systemsshould be installed with heat pipe heatexchangers for dehumidification enhancementaccording to Yat H. Yau (2). The use of heatpipe save a lot of energy. Research by A.MAlklaibi(3) showed for low room sensible heatfactor, using loop heat pipe can improve theCOP by approximately 2.1-fold over that whenheating element is used. The author hassuggestedpossibleconfigurationsofincorporating the loop heat pipe into the air-ISBN: 978-1-61804-175-376
Latest Trends in Renewable Energy and Environmental Informaticsrejected from a vapour air conditioning cycleis utilized to activate a solid nce sensitivity of a first generationprototype hybrid vapour air conditioningsystem to variable outdoor conditions has beenstudied and compared to the performance ofconventional vapour air conditioning systems.Results showed that the performanceimprovement over vapour air conditioningsystems could be 60% at the same level ofdehumidificationunderARIsummerconditions. Simulation study by Thibaut Vitteon desiccant system show substantial energysavings for summer period, with satisfactorythermal comfort of the occupants(6).Reduction in humidity will reduce airconditioning load and provide good indoor airquality simultaneously. Investigation byC.X.Jia(7) showed hybrid desiccant coolingsystem economizes 37.5% electricity powerswhen the process air temperature and relat
should be installed with heat pipe heat exchangers for dehumidification enhancement according to Yat H. Yau (2). The use of heat pipe save a lot of energy. Research by A.M Alklaibi(3) showed for low room sensible heat factor, using loop heat pipe can improve the COP by appro
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