Vapor quality and performance of an automotive air conditioning system

Wang, Shujun; Gu, Junjie; Dickson, Tim; Dexter, Jennifer; McGregor, Ian A.

doi:10.1016/j.expthermflusci.2005.03.019

Cited by 32 publications

(13 citation statements)

References 12 publications

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“…As a result, whenever the value of _ Q Cooling is used in the present method, it merely represents the average cooling capacity of the system operating between the high and low set points. Jabardo et al [22] and Wang et al [23] showed that the cooling capacity varies by less than 5% due to 1°C of evaporating temperature increase. Both studies show the same behavior for the dependence of the cooling capacity to the condensing temperature.…”

Section: Resultsmentioning

confidence: 98%

An inverse method for calculation of thermal inertia and heat gain in air conditioning and refrigeration systems

2015

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Section: Resultsmentioning

confidence: 98%

An inverse method for calculation of thermal inertia and heat gain in air conditioning and refrigeration systems

2015

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“…A sight glass tube was placed at the outlet of mass flowmeter to confirm that the flowmeter chamber was filled with vapour refrigerant only. Then, the vapour refrigerant and liquid refrigerantÀPAG oil are mixed again at the inlet of the compressor (Wang et al, 2005).…”

Section: Experimental Set-upmentioning

confidence: 99%

Investigation of the effects of vapour quality and oil concentration on performance of a swash plate compressor

Wang

Dickson³

2006

Int. J. Energy Res.

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SUMMARYThe main objective of the present study is to experimentally investigate the effects of vapour quality and oil concentration on the performance of a swash plate compressor for automotive air conditioning systems. R-134a is used as refrigerant. The compressor used is a typical automotive swash-plate-type compressor driven by a 10 hp variable-speed electric motor and lubricated by polyalkylene glycol (PAG) oil. The variables measured during the experiment are pressure, temperature, oil concentration, total mass flow rate and vapour mass flow at the inlet and outlet of the compressor. The experiment was performed at varying compressor speeds, compression ratios and vapour quality. The results revealed some unknown aspects of the compression process in an automotive air conditioning system. The vapour quality does not affect volumetric efficiency, but influences isentropic efficiency of the compressor. In the vapour quality range of 80-90%, isentropic efficiency decreases with increasing vapour quality. During the compression process, only a portion of the liquid refrigerant evaporates. However, at the outlet of the compressor, refrigerant/oil mixture never reaches steady state. The evaporation ratio decreases with increasing compressor speed, and with increasing vapour quality as well.

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“…Finally, based on the exergoenvironmental optimization, they have determined that a 13% higher exergy efficiency and 5% lower environmental impact can be achieved at the expense of a 27% increase in the total cost. Wang et al [8] conducted an experimental study of an AACS with two-phase flow measurements. They evaluated the system performance characteristics with respect to the evaporator and condenser temperatures and refrigerant charge.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, due to the limited time spent in the vehicles compared to buildings, along with the competing energy requirements between the cabin and the battery, the thermal management systems must be capable of conditioning the air in the passenger cabin quickly and quietly, while keeping the vehicle components operating under ideal operating temperature ranges (especially the electric battery) to prolong their lifetime and increase the fuel efficiency. Thus, special attention needs to be given to hybrid electric vehicle TMSs [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Efficiency Investigation of Hybrid Electric Vehicle Battery Thermal Management Systems

Hamut

Dinçer

Naterer

2014

Journal of Energy Resources Technology

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In this study, a thermodynamic model of a hybrid electric vehicle battery thermal management system (TMS) is developed and the efficiency of the system is determined based on different parameters and operating conditions. Subsequently, a TMS test bench is used with a production vehicle (Chevrolet Volt) that is fully instrumented in order to develop a vehicle level demonstration of the study. The experimental data are acquired under various conditions using an IPETRONIK data acquisition system, along with other reported data in the literature, to validate the numerical model results. Based on the analyses, the condenser and evaporator pressure drop, compressor work and compression ratio, evaporator heat load and efficiency of the system are determined both numerically and experimentally. The predicted results are determined to be within 6% of the conducted experimental results and within 15% of the reported results in the literature.

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Vapor quality and performance of an automotive air conditioning system

Cited by 32 publications

References 12 publications

An inverse method for calculation of thermal inertia and heat gain in air conditioning and refrigeration systems

An inverse method for calculation of thermal inertia and heat gain in air conditioning and refrigeration systems

Investigation of the effects of vapour quality and oil concentration on performance of a swash plate compressor

Experimental and Theoretical Efficiency Investigation of Hybrid Electric Vehicle Battery Thermal Management Systems

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