IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684,p-ISSN: 2320-334X, PP 103-108 www.iosrjournals.org Innovation in engineering science and technology (NCIEST-2015) 103 | Page JSPM’S Rajarshi Shahu College Of Engineering,Pune-33,Maharashtra ,India Experimental analysis of performance of HPHX by varying the input parameters for HVAC application J. A. Kute 1 , A. A. Pawar 2 ,A. M. Kate 3 1 (Research Scholar, DoT, Savitribai Phule Pune University & Asst. Prof. RSCOE, Pune) 2 (Professor and Head, Mechanical Engineering, JSPM’s RSCOE, Pune) 3 (Professor and Head, Mechanical Engineering, KJ’s, TCOE, Pune) Abstract: A Research has been carried out to investigate the effect of HPHX (heat pipe heat exchanger) on energy recovery in air conditioning system. In this research first HPHXhas been designed and manufactured for heat recovery. In this research the wickless heat pipe have been investigated. The HPHX was designed, constructed and tested fortemperature range of 15 to 42 O C and relative humidity 50%. R134a was used as working fluid.An experimental results showsthat effectiveness increases with increase in air velocity &EBR (energy balance ratio) increases with increase of outdoor DBT. Keywords: Heat pipe, Heat Exchanger, Energy recovery, HVAC. Nomenclature C pc = Specific heat of conditioned air stream at atmospheric pressure at T 4 0 C(J/kg. 0 C) C pe = Specific heat of outdoor air stream at atmospheric pressure at T 1 0 C(J/kg. 0 C) EBR = Energy balance ratio HVAC = Heating ventilation and air conditioning. HPHX = Heat pipe heat exchanger. m  = Mass flow rate of air (kg/s). T 1 = Dry bulb temperature of inlet outdoor air before evaporator ( 0 C) T 2 = Dry bulb temperature of air after evaporator ( 0 C) T 3 = Dry bulb temperature of air before condenser ( 0 C) T 4 = Dry bulb temperature of air after evaporator ( 0 C) V = Velocity of inlet outdoor air to heat pipe (m/s) Qe = Heat absorbed at evaporator section (W) Qc = Heat rejected at condenser section (W) ε = Effectiveness I. Introduction As an efficient heat exchanger, heat pipe heat exchangers (HPHXs) are playing a considerable role in different fields like energy conservation, energy recovery and renewable energy based systems including air conditioning systems. A heat pipe heat exchanger is a heat transfer device, in which the latent heat of vaporization is utilized to transfer heat over a long distance with a corresponding small temperature difference.In order to reduce the energy consumption by central air conditioning system in tropical climate lot of literature is available by using the heat pipe heat exchangers.J.W. Wan et al.[1] carried out field work to investigate the effect of loop heat-pipe air-handling coil on energy consumption in a HVAC system with return air. The study indicates that the relative humidity has more impact than that of indoor temperature on energy consumption and effectiveness of HPHX. S. H. Noie et al. [2] carried out research on heat pipe using Methanol, Ethanol & Acetone as working fluid and three types of wick for the operating temperature range of 15 to 55 0 C. After conducting series of experiments, it shows that lower effectiveness of HPHX was due to lack of fins, high pitch to diameter ratio and high air face velocity.Mostafa A. et al. [3] developed the heat pipe heat exchanger for the heat recovery applications to cool the incoming fresh air in HVAC system,where two streams of fresh and return air to investigate the thermal performance and effectiveness of heat recovery system. Y. H. Yau [18] investigated experimentally 8-row thermosyphon-based HPHX for tropical building. This research was an investigation into how the sensible heat ratio (SHR) of the 8-row HPHX was influenced by each of three key parameters of the inlet air state, DBT, relative humidity and air velocity. Y.H.Yau [4] carried out experimentation using thermosyphon HPHX with 8 rows with the angle of tilt 30 0 to examine the influence of