The Effects of Wet Compression by the Electronic Expansion Valve Opening on the Performance of  a Heat Pump System

Seong, Kyoungjin; Lee, Daehui; Lee, Jinho

doi:10.3390/app7030248

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…Liang et al [8] and Hu et al [9] presented the optimum design and a prediction model of heat exchangers. Other studies [10][11][12][13] reported various approaches for improving efficiency and to mitigate GHG emissions. All these studies are indispensable for continuous progress, and guarantee steady steps toward reducing direct and indirect emissions of GHGs.…”

Section: Fundamental Process Components and Mechanical Vapor Comprementioning

confidence: 99%

Special Issue on Sciences in Heat Pump and Refrigeration

Miyazaki

2019

Applied Sciences

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Section: Fundamental Process Components and Mechanical Vapor Comprementioning

confidence: 99%

Special Issue on Sciences in Heat Pump and Refrigeration

Miyazaki

2019

Applied Sciences

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“…Additionally, wet compression can make the vapor compression refrigeration cycle with pure working fluid closer to the ideal Carnot cycle. When the suction dryness is low, the liquid droplets drawn into the compressor completely vaporize within a short time, thereby improving compressor performance and reducing discharge temperature [27]. The wet compression cycle offers the highest possible efficiency for thermodynamic cycles operating between two temperatures with a heat sink and heat source [28,29].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Verification of the Electrical Efficiency for Variable-Frequency Rolling Piston Compressor under Variable Suction Conditions

Cheng,

Tao,

Huang

et al. 2023

Applied Sciences

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The frequency and the suction refrigerant state are complex in the actual operation of variable compressors, which leads to the variability of compressor performance under different operating conditions. The characterization and the modeling of the compressor have become hot research topics. For modeling, the electrical efficiency model of the compressor, which could be applied to the suction refrigerant state at both the superheated and the two-phase stages, the compressor frequency, the pressure ratio, and the evaporation temperature, is analyzed through experiments in this paper. The results show that the linear electrical efficiency decreases with the declining superheated temperature and the increasing suction vapor quality when the system is at the fixed and evaporating temperature. Moreover, the slope of the two-phase suction is above that of the superheated suction. In addition, the system’s electrical efficiency at the fixed pressure ratio is inversely proportional to the evaporation temperature, and the electrical efficiency of the system at the fixed evaporating temperature is also inversely proportional to the pressure ratio. The higher the variation of the pressure ratio, the smaller the evaporation temperature influences. To demonstrate the precision of the model, the theoretical value is compared with a confirmatory experiment in this paper. The maximum relative error is 1.81%, and the minimum is 0.035%.

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“…It indicated that the air-conditioner with two-phase suction injection had the maximum mean cooling capacity and was more appropriate in severely high cooling-load seasons. Seong et al 11 tested a heat pump under different suction qualities by controlling the electronic expansion valve and found that the discharge temperature decreased while the mass flow rate increased; the maximum heat capacity and COP occurred at specific quality.…”

Section: Introductionmentioning

confidence: 99%

Influence of two-phase suction injection on performances of the scroll refrigeration compressor with a high-temperature shell

Sun

Wang

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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The two-phase suction injection can reduce the discharge temperature of scroll refrigeration compressors, which work under a high-pressure ratio. The heat transfer along the pipe axis from the shell affects the two-phase suction injection significantly for the compressor with a high-temperature shell. In this paper, the suction mixing and heat transfer model was developed to calculate the heat transfer along the pipe axis from the high-temperature compressor shell. Then the model was coupled with the two-phase compressor model to obtain the compressor performance under different suction injection volume flow rates. The compressor with two-phase suction injection was tested under different injection volume flow rates to validate the model. The results indicated that the discharge temperature decreased by 2 °C when the mass injection ratio increased by 1%. As the injection volume flow rates increased, the total mass flow rate increased due to the reduction of the specific volume of the suction fluid; the input work decreased because of the reduction of specific work and the improvement of the motor's electric efficiency. The cooling capacity decreased since the cooling capacity of the injection refrigerant was wasted for cooling the suction process and the compressor shell, especially at high injection volume flow rates. The coefficient of performance reached the maximum value at the injection volume flow rate of 0.015 m3·h−1 and became lower than the coefficient of performance without injection when the injection volume flow rate raised to 0.035 m3·h−1. Hence, the two-phase suction injection can reduce the discharge temperature efficiently at low injection volume flow rates with a slight improvement of coefficient of performance.

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The Effects of Wet Compression by the Electronic Expansion Valve Opening on the Performance of a Heat Pump System

Cited by 7 publications

References 15 publications

Special Issue on Sciences in Heat Pump and Refrigeration

Special Issue on Sciences in Heat Pump and Refrigeration

Modeling and Experimental Verification of the Electrical Efficiency for Variable-Frequency Rolling Piston Compressor under Variable Suction Conditions

Influence of two-phase suction injection on performances of the scroll refrigeration compressor with a high-temperature shell

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