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Research on the Application of Micro-Channel Evaporator in R134a Roof-Top Bus Air Conditioner
Technical Paper
2017-01-0161
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This study investigates the cycle performance and potential advantages of the replacement of fin-and-tube evaporator with parallel flow micro-channel evaporator, in R134a roof-top bus air conditioner (AC) system. The heat exchangers for bus AC system are featured by a stringent space height limitation. The configuration of inclined four piece or six piece micro-channel evaporators was proposed to satisfy this space requirement, instead of original two piece fin-and-tube evaporators. Additionally, the individual superheat control method with thermostatic expansive valve (TXV) in each evaporator was adopted to improve refrigerant distribution. Three kinds of micro-channel evaporators were designed and equipped in an 8-m roof-top bus AC system. Except the replacement of evaporators, TXV and connecting pipes, other cycle components were kept same. Comparison experiments were carried out to evaluate the cycle performance with micro-channel evaporator configuration in psychometric calorimeter test facility at rated cooling condition. Experiment results, including R134a refrigerant charge, superheat performance, cooling capacity and system coefficient of performance (COP) were compared between micro-channel evaporator system and fin-and-tube evaporator system. Results show that individual superheat control method improved the superheat distribution uniformity among multiple evaporators, and enhanced the system cooling capacity. Besides, the optimum micro-channel evaporator configuration achieved equal cooling capacity and COP with fin-and-tube evaporators. Furthermore, potential advantages including refrigerant charge reduction, cost saving, system mass reduction, and compact installation were also discussed for the application of micro-channel evaporator in roof-top bus AC system.
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Wang, D., Liu, C., and Chen, J., "Research on the Application of Micro-Channel Evaporator in R134a Roof-Top Bus Air Conditioner," SAE Technical Paper 2017-01-0161, 2017, https://doi.org/10.4271/2017-01-0161.Data Sets - Support Documents
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References
- Mader , G. , Fösel G.P.F. , and Larsen L.F.S. Comparison of the transient behavior of microchannel and fin-and-tube evaporators International Journal of Refrigeration 2011 34 5 1222 1229 10.1016/j.ijrefrig.2011.01.011
- Zhang , W. , Effect of refrigerant flow direction and throttle opening in RAC unit using micro-channel evaporator International Journal of Refrigeration 2016 70 280 288 10.1016/j.ijrefrig.2016.02.001
- Shi , J. , Investigating performance of microchannel evaporators with different manifold structures International Journal of Refrigeration 2011 34 1 292 302 10.1016/j.ijrefrig.2010.08.008
- Mansour , M.K. , Musa M.N. , and Hassan M.N.W. Thermoeconomic optimization for a finned - tube evaporator configuration of a roof - top bus air - conditioning system International Journal of Energy Research 2008 32 4 290 305 10.1002/er.1354
- Yenneti , S. , Nayak G. , and Punuru P.R. Optimization Of A Main Engine Driven Roof Top Bus Air-Conditioning System presented at Puedue conferences USA July 16, 2014
- Khamis Mansour , M. , Development of novel control strategy for multiple circuit, roof top bus air conditioning system in hot humid countries Energy Conversion and Management 2008 49 6 1455 1468 10.1016/j.enconman.2007.12.032
- Wang , D. , Influence factors of flow distribution and a feeder tube compensation method in multi-circuit evaporators International Journal of Refrigeration 73 11 23 10.1016/j.ijrefrig.2016.09.011
- US Department of Commerce, N Simulation of an evaporator with non-uniform one-dimensional air distribution 1991
- Kim , J.H. , Braun J.E. , and Groll E.A. Evaluation of a hybrid method for refrigerant flow balancing in multi-circuit evaporators International Journal of Refrigeration 2009 32 6 1283 1292 10.1016/j.ijrefrig.2009.01.016