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Transient simulation of secondary loop mobile air conditioning systems.

Number: pap. 2484

Author(s) : MEI Z., HWANG Y., KIM J.

Summary

Since the conventional refrigerant R-134a is being phased down due to its high Global Warming Potential (GWP), finding a suitable replacement refrigerant with low GWP and system design is of great importance. However, most of the alternatives are either flammable or more expensive. Therefore, to ensure the safety of passenger and reduce the refrigerant charge, a Secondary Loop (SL) system with coolant loop on both condenser side and evaporator side was proposed. In the SL system, the evaporator and condenser exchange heat with air through cabin cooler and radiator, respectively. The SL system has more advantages than the Direct Expansion (DX) system such as the easy applicability of battery thermal management. In this study, transient models were developed for both DX system and SL system in Dymola. The simulation results show that the coefficient of performance of the SL system is lower than that of DX system due to high pressure ratio and high compressor revolution speed when two types of systems provide similar cooling capacity. Moreover, the performances of the system using R-134a, R-152a, and R-1234yf were evaluated and compared to that of conventional DX system using R-134a under the Urban Dynamometer Driving Schedule (UDDS). Though large fluctuation is observed on the condenser capacity in the DX system, the evaporator capacity is very stable. In overall, R-152a has better performance than R-1234yf and is a good candidate as an alternative refrigerant, but the secondary system needs more efficiency enhancement options to compete with current DX R-134a system.

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Pages: 10

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Details

  • Original title: Transient simulation of secondary loop mobile air conditioning systems.
  • Record ID : 30024578
  • Languages: English
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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