Influence of liquid refrigerant injection on the performance of an inverter-driven scroll compressor

Cho, Honghyun; Chung, Jin Taek; Kim, Yongchan

doi:10.1016/s0140-7007(02)00017-8

Cited by 74 publications

(27 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, the number of liquid droplets and a finite time required for heat transfer during compression, are considered to be important for preventing an abrupt increase in the pressure and a greater wear of the cylinder. Sami et al [9] reported that a 5% liquid injection at the compressor inlet enhances the performance of a heat pump. Cho et al [10] reported that the liquid refrigerant injection, under a low speed, increases the leakage between scroll wraps, but is very effective under a high speed.…”

Section: Introductionmentioning

confidence: 99%

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

Seong

Lee

2017

Applied Sciences

View full text Add to dashboard Cite

Abstract:In this study, by controlling the Electronic Expansion Valve opening, the influence of wet compression on a heat pump system was experimentally investigated in different heating conditions. The results demonstrate that the discharge temperature decreased and the mass flow rate increased, due to quality of the rising liquid droplets. It was also found that the heating capacity and power input of wet compression increased more than that of dry compression, with a superheat of 10 • C. The maximum COP (Coefficient of Performance) exists at a specific quality of ca. 0.94 to 0.90, as the power input in the region of wet compression is proportionally larger than the increase in the heating capacity, according to the decreasing quality. When the Entering Water Temperature of the Outdoor Heat Exchanger was 10 • C, 5 • C, and 0 • C, the COP increased by a maximum of ca. 12.4%, 10.6%, and 10.2%, respectively, in comparison to the superheat of 10 • C. In addition, the superheat at the discharge line is proposed as a proper controlling parameter to adjust the quality at the suction line, by varying the opening of the expansion valve during wet compression.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Seong

Lee

2017

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…The compressor, that is the principal component of a vapour compression plant, has recently undergone optimizations and changes [1][2][3]. Scroll and reciprocating compressors for small and medium size plants are used both in residential and commercial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Reciprocating compressors are highly efficient; scroll compressors require a further improvement for it to be as efficient as reciprocating compressors. When compression ratio are high, reciprocating compressor is more efficient than the scroll without injection; however, it is possible to increase the scroll compressor efficiency by injecting some refrigerant in liquid or vapour phase [3].…”

Section: Introductionmentioning

confidence: 99%

“…A less energy consumption with respect to the on-off control [4] can be obtained with a continuous control of the 3 compressor speed. As for scroll compressors the frequency of the motor supply current can be about 15 Hz; while for reciprocating compressors, it cannot be lower than 30 Hz, because of the increase in the compressor vibrations, the noise and the lubrication problems due to the splash system.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Determination of the compressor optimal working conditions

Aprea¹,

Mastrullo²,

Renno³

2009

Applied Thermal Engineering

View full text Add to dashboard Cite

The replacement of environmentally unfriendly refrigerants and the energy saving demand have recently caused changes of the components and operation of the vapour compression plants; in particular, the compressors have been experiencing upgrades and modifications. The compression systems are usually designed for working under maximum load conditions, but most of the time these plants work under partial load conditions with compressor on-off cycles regulated by a thermostat. As for the variable speed compressor, the speed is continuously controlled to match the compressor capacity to the load required; this allows to save energy when compared to the thermostatic control. The aim of this paper is to identify the compressor current frequency that optimizes the energy, exergy and economy aspects. The determination of the optimum frequency for each working condition is key to build a control algorithm that allows the compressor speed to be continuously regulated by an inverter. This ACCEPTED MANUSCRIPT 2 analysis has been applied to the reciprocating and scroll compressors and high energy savings have been achieved.

show abstract

“…Several studies have been reported on refrigerant liquid and hot gas injection and their applications (Cho et al, 2003;Dutta et al, 2001;Afjei et al, 1992;Wang et al, 1998) using CFCs and HCFCs. Hot gas injection is intended to improve the cooling capacity while liquid injection is employed to decreasing the discharge temperature and to protect the compressor.…”

Section: Introductionmentioning

confidence: 99%

Two-phase flow convective condensation of refrigerant mixtures under gas/liquid injection

Sami

Comeau

2005

Int. J. Energy Res.

View full text Add to dashboard Cite

SUMMARYThe influence of gas/liquid injection on two-phase flow condensation heat transfer characteristics of some refrigerant mixtures in horizontal enhanced surface tubing is presented.Correlations were proposed to predict the impact of the gas/liquid injection on the heat transfer characteristics such as average heat transfer coefficient of R-507, R-404A, R-410A, and R-407C in twophase flow condensation inside enhanced surface tubing. The data also revealed that gas, liquid and gas/ liquid injection is beneficial at certain gas/liquid injection ratios to the heat transfer coefficient depending upon the Reynolds number and the condensation point of the refrigerant mixtures in question.It was also evident that the proposed condensation correlations and the experimental data were applicable to the entire heat and mass flux, investigated in the present study under gas/liquid injection conditions. The deviation between the experimental and predicted under gas/liquid injection were less than AE 10, for the majority of data.

show abstract

Influence of liquid refrigerant injection on the performance of an inverter-driven scroll compressor

Cited by 74 publications

References 4 publications

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

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

Determination of the compressor optimal working conditions

Two-phase flow convective condensation of refrigerant mixtures under gas/liquid injection

Contact Info

Product

Resources

About