Experimental Study on Thermal Performance of a Heat Pipe Using Different Refrigerants as a Working Fluid

Mohammad Ayub Adar; Jamal Uddin  Ahamed Ahamed; Rupak Saha; Sadia Nourin Mim; Ismail Hossain Hossain

doi:10.38032/scse.2026.4.266

Authors

Mohammad Ayub Adar Department of Mechanical Engineering, Chittagong University of Engineering & Technology, Chattogram-4349, Bangladesh
Jamal Uddin Ahamed Ahamed Department of Mechanical Engineering, Chittagong University of Engineering & Technology, Chattogram-4349, Bangladesh
Rupak Saha Department of Mechanical Engineering, Chittagong University of Engineering & Technology, Chattogram-4349, Bangladesh
Sadia Nourin Mim Department of Mechanical Engineering, Chittagong University of Engineering & Technology, Chattogram-4349, Bangladesh
Ismail Hossain Hossain Department of Mechanical Engineering, Chittagong University of Engineering & Technology, Chattogram-4349, Bangladesh

DOI:

https://doi.org/10.38032/scse.2026.4.266

Keywords:

Heat Pipe, R-600a, R-134a, Thermal Efficiency, Phase Change

Abstract

Heat pipes, meanwhile, refer to an efficient and passive cooling device utilizing the liquid phase change of the circulating fluid in transferring latent heat. An elementary design of a copper heat pipe was developed and constructed, taking refrigerant R-600a and R-134a as the working fluid. Experimental data were taken and analyzed from 46^oC over 90 minutes with measurements taken every 10 minutes. Consequently, the average cooling rates were found 0.100^oC min^-1 for R-600a and 0.101^oC min^-1for R-134a. However, R-600a faster initial pull down in temperature till 40^oC whereas R-134a showed greater late stage approach to lower set-point temperature till 38^oC. Evidently, the results confirm that the selection of working fluid should be based on operating temperature regime for better outcomes as well as both refrigerants are efficient in thermal management which can be employed as an eco-friendly alternative to conventional refrigerants in heat pipe applications.

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References

[1] Dhairiyasamy, R., Dixit, S., Singh, S. and Gabiriel, D., 2025. Thermal optimization of heat pipes with multi-walled carbon nanotubes and aluminum oxide nanofluids. Case Studies in Thermal Engineering, 74, p.106936. DOI: https://doi.org/10.1016/j.csite.2025.106936

[2] Korkmaz, T.Y. and Ermis, K., 2025. Effect of using R-1234ze refrigerant instead of water–methanol fluid in laptop heat pipes on CPU temperature. Journal of Engineering Research and Applied Science, 14(1), pp.106–112.

[3] Anand, R.S., 2025. An evaluation of thermosyphon heat pipe charged R134a and R600a using machine-learning algorithms. Contemporary Advances in Science and Technology, 8(1), pp.22–37. DOI: https://doi.org/10.70130/CAST.2025.8103

[4] Sistaninia, A., Nassab, S.A.G. and Namjoo, A., 2025. Feasibility study on designing a heat pipe to reduce the air temperature in the compressor of a gas turbine. Heat Transfer. DOI: https://doi.org/10.1002/htj.70033

[5] Yilmaz, M. and Cimsit, C., 2024. Experimental analysis of a vapor compression refrigeration cycle with heat pipe. Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, p.09544089241272837. DOI: https://doi.org/10.1177/09544089241272837

[6] Wu, L., Chen, J. and Wang, S., 2022. Experimental study on thermal performance of a pulsating heat pipe using R1233zd(E) as working fluid. International Communications in Heat and Mass Transfer, 135, p.106152. DOI: https://doi.org/10.1016/j.icheatmasstransfer.2022.106152

[7] Islam, M.Z., Al-Mamun, M. and Salam, B., 2017. Design and fabrication of a heat pipe using refrigerant R-134a as working fluid. International Journal of Engineering Trends and Technology, 49(6), pp.415–418. DOI: https://doi.org/10.14445/22315381/IJETT-V49P264

[8] Faghri, A., 2012. Review and advances in heat pipe science and technology. Journal of Heat Transfer, 134(12), p.123001. DOI: https://doi.org/10.1115/1.4007407

[9] Velkumaran, R.V.M., Sakthivel, S., Udhairaj, S., Rajkumar, P. and Mary, V.Q.F., 2020. Design and fabrication of refrigerator using LPG as refrigerant. International Research Journal of Engineering and Technology, 7(9), pp.268–271.

[10] Austin, N., Kumar, P.S. and Kanthavelkumaran, N., 2012. Thermodynamic optimization of household refrigerator using propane–butane as mixed refrigerant. International Journal of Engineering Research and Applications, 2(6), pp.268–271.

[11] Islam, M.Z. and Salam, B., 2017. Analysis of a vertical heat pipe for free and forced convection using refrigerant R-22 as working fluid. International Journal of Engineering Research and Technology, 6(7), pp.502–504.

[12] Yau, Y.H. and Ahmadzadehtalatapeh, M., 2010. A review on the application of horizontal heat pipe heat exchangers in air conditioning systems in the tropics. Applied Thermal Engineering, 30(2), pp.77–84. DOI: https://doi.org/10.1016/j.applthermaleng.2009.07.011

[13] Riffat, S.B., Zhao, X., Doherty, P.S. and Lin, S., 2004. Development of a simplified heat pipe numerical model and case study/experimental validation using a long ‘wicked’ heat pipe. International Journal of Energy Research, 28(14), pp.1293–1311. DOI: https://doi.org/10.1002/er.1044

[14] Peterson, G.P., 1994. An introduction to heat pipes: Modeling, testing, and applications. Wiley Series on Thermal Management of Microelectronics and Electronic Systems.

[15] Ismail, K.A.R. and Miranda, R.F., 1997. Two-dimensional axisymmetrical model for a rotating porous wicked heat pipe. Applied Thermal Engineering, 17(2), pp.135–155. DOI: https://doi.org/10.1016/S1359-4311(96)00023-3

[16] Cheng, S., Wang, S. and Liu, Z., 2014. Cycle performance of alternative refrigerants for domestic air-conditioning system based on a small finned tube heat exchanger. Applied Thermal Engineering, 64(1–2), pp.83–92. DOI: https://doi.org/10.1016/j.applthermaleng.2013.12.022

[17] Huminic, G., Huminic, A., Morjan, I. and Dumitrache, F., 2011. Experimental study of the thermal performance of thermosyphon heat pipe using iron oxide nanoparticles. International Journal of Heat and Mass Transfer, 54(1), pp.656–661. DOI: https://doi.org/10.1016/j.ijheatmasstransfer.2010.09.005

[18] Kobayashi, T., Ogushi, T., Haga, S., Ozaki, E. and Fujii, M., 2003. Heat transfer performance of a flexible looped heat pipe using R134a as a working fluid: Proposal for a method to predict the maximum heat transfer rate of FLHP. Heat Transfer Research, 32(4), pp.306–318. DOI: https://doi.org/10.1002/htj.10093

[19] Vizitiu, R.S., et al., 2023. Investigating the efficiency of a heat recovery–storage system using heat pipes and phase change materials. Materials, 16(6), p.2382. DOI: https://doi.org/10.3390/ma16062382

[20] Mona, Y., Chaichana, C., Suttakul, P., Watanabe, W.C. and Do, T.A., 2022. Effect of halocarbon refrigerants as working fluid of the heat pipe for thermoelectric power generation. Energy Reports, 8, pp.882–887. DOI: https://doi.org/10.1016/j.egyr.2022.10.025

[21] Maalej, S., Chouat, I., Zaghdoudi, M.C. and Nord, C.U., 2019. Mathematical modelling of engineering problems: Experimental investigation on the thermal performance of a heat pipe-based cooling system. Mathematical Modelling of Engineering Problems, 6(2), pp.217–228. DOI: https://doi.org/10.18280/mmep.060209

[22] Cattani, L., Sacchelli, F. and Bozzoli, F., 2025. Enhanced passive thermal management for electric vehicle batteries using a 3D pulsating heat pipe. Energies, 18(9), p.2306. DOI: https://doi.org/10.3390/en18092306