Experimental investigation and performance comparison of two types of microchannel and Fin-tube condensers with R407c refrigerant in compression refrigeration cycle

Document Type : Research Article

Authors

1 Faculty of Aerospace, Malek Ashtar University of Technology, Tehran, Iran

2 Thermal Cycles & Heat Exchangers Research Department, Niroo Research Institute (NRI), Tehran, Iran

3 Department of Mechanics, Islamic Azad University, Yadegar-e-Imam Khomeini Branch, Tehran, Iran

Abstract

The present research deals with the experimental investigation and comparison of microchannel and fin-tube condensers in a refrigeration cycle. This research investigates the effect of the type of condenser on the efficiency of the duct-split with a cooling capacity of 2.5 tons of refrigeration using experimental tests. For this purpose, two microchannel and fin-tube condensers have been used in a refrigeration cycle that has R407c refrigerant. Except for the condenser, the rest of the components of the refrigeration cycle, such as the fan, compressor, expansion valve, and evaporator are the same in both refrigeration cycles. The effect of the type of condenser on the performance coefficient of the refrigeration cycle has been evaluated at three different speeds of the condenser fan. Also, compressor power, evaporator cooling power, condenser thermal power, and temperature-entropy diagram (T-s) were extracted. Six different experiments have been conducted, and each experiment has been repeated three times to ensure the results. The results show that the use of the microchannel condenser in the same conditions and with 700 g less refrigerant charge in the entire refrigeration cycle, increases the performance factor by about 4% compared to the system that has fin-tube condenser.

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References

[1] S. Parmar, K.N. Patel, A. Jejurkar, A review of air conditioning with the use of mini-channel and micro-channel heat exchanger, Int. J. Sci. Eng. Res, 8(4) (2017) 86-90.
[2] N. Obot, Toward a better understanding of friction and heat/mass transfer in microchannels--a literature review, Microscale Thermophysical Engineering, 6(3) (2002) 155-173.
[3] M.-H. Kim, C.W. Bullard, Performance evaluation of a window room air conditioner with microchannel condensers, J. Energy Resour. Technol., 124(1) (2002) 47-55.
[4] S. Garimella, Condensation flow mechanisms in microchannels. basis for pressure drop and heat transfer models, in.  International Conference on Nanochannels, Microchannels, and Minichannels, 2003, pp. 181-192.
[5] J.H. Jeong, K.S. Chang, H. Kim, S.H. Kil, H. Kim, Performance Assessment of Aluminum Parallel Flow Condenser Applied to Residential Air-Condition, in.  Proceedings of the SAREK Conference, The Society of Air-Conditioning and Refrigerating Engineers of Korea, 2004, pp. 117-117.
[6] P. Naphon, O. Khonseur, Study on the convective heat transfer and pressure drop in the micro-channel heat sink, International Communications in Heat and Mass Transfer, 36(1) (2009) 39-44.
[7] H. Li, P. Hrnjak, An experimentally validated model for microchannel heat exchanger incorporating lubricant effect, International journal of refrigeration, 59 (2015) 259-268.
[8] R.S. Rametta, J. Boeng, C. Melo, Theoretical and Experimental Evaluation of Microchannel Condensers Applied to Household Refrigerators, in.  International Refrigeration and Air Conditioning Conference, Purdue University, 2018.
[9] J. Li, P.S. Hrnjak, Design for Microchannel Condensers With Separation Circuiting, in.  International Refrigeration and Air Conditioning Conference, Purdue University, 2018.
[10] E. Zanetti, M. Azzolin, S. Bortolin, G. Busato, D. Del Col, Design and testing of a microchannel heat exchanger working as condenser and evaporator, in.  International Refrigeration and Air Conditioning Conference, Purdue University, 2018.
[11] M. Tosun, B. Doğan, M.M. Öztürk, L.B. Erbay, Integration of a mini-channel condenser into a household refrigerator with regard to accurate capillary tube length and refrigerant amount, International Journal of Refrigeration, 98 (2019) 428-435.
[12] B. Xu, Y. Wang, J. Chen, F. Li, D. Li, X. Pan, Investigation of domestic air conditioner with a novel low charge microchannel condenser suitable for hydrocarbon refrigerant, Measurement, 90 (2016) 338-348.
[13] Y. Zou, P.S. Hrnjak, Comparison and generalization of R410A and R134a distribution in the microchannel heat exchanger with the vertical header, Science and Technology for the Built Environment, 21(5) (2015) 555-563.
[14] X. Zhang, L. Jia, Q. Peng, C. Dang, Experimental study of condensation heat transfer in a condenser with a liquid-vapor separator, Applied Thermal Engineering, 152 (2019) 196-203.
[15] C. Zeng, Y. Song, X. Zhou, F. Zhang, M. Jiao, M. Liu, H. Gu, Experimental study on heat transfer and pressure drop characteristics in a microchannel heat exchanger assembly with S-shaped fins, Applied Thermal Engineering, 210 (2022) 118406.
[16] S.M. Ammar, N. Abbas, S. Abbas, H.M. Ali, I. Hussain, M.M. Janjua, U. Sajjad, A. Dahiya, Condensing heat transfer coefficients of R134a in smooth and grooved multiport flat tubes of automotive heat exchanger. An experimental investigation, International journal of heat and mass transfer, 134 (2019) 366-376.
[17] K. Keniar, S. Garimella, Experimental investigation of refrigerant condensation in circular and square micro-and mini-channels, International Journal of Heat and Mass Transfer, 176 (2021) 121383.
Amirkabir Journal of Mechanical Engineering
Volume 55, Issue 5
August 2023
Pages 577-594

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