A study on the cycle characteristics of an auto-cascade refrigeration system

Du, Kai; Zhang, Xianghua; Xu, Weijie; Niu, Xiaofeng

doi:10.1016/j.expthermflusci.2008.08.006

Cited by 69 publications

(17 citation statements)

References 3 publications

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“…The results showed that most of the exergy losses in the ACR cycle occurred in IHEX. Du et al [24] also proposed that the optimized IHEX, the rectifying device and refrigerant type were the main impacts on the coefficient of performance (COP) for ACR cycle. Nayakand and Venkatarathnam [25] studied the optimum number of IHEX used in ACR cycle at different refrigeration temperature.…”

Section: Introductionmentioning

confidence: 98%

Experimental and theoretical investigation on the performance of CO2/propane auto-cascade refrigerator with a fractionation heat exchanger

Zhang

et al. 2015

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 98%

Experimental and theoretical investigation on the performance of CO2/propane auto-cascade refrigerator with a fractionation heat exchanger

Zhang

et al. 2015

Applied Thermal Engineering

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“…For this particular reason, the architecture of the heat pump would have to be modified so that the added component will circulate through the loop without being stored in the evaporator or in the suction line bottle. When such mixtures are to be tested, previous works can be analyzed, as for example the so-called auto-cascade refrigeration systems [8] or the work of [9]. First candidates for CO 2 based mixtures are presented in Table 1, along with expected effects.…”

Section: Co 2 Based Mixturesmentioning

confidence: 99%

Experimental study of heat pump thermodynamic cycles using CO2 based mixtures - Methodology and first results

Bouteiller¹,

Terrier²,

Tobaly³

2017

AIP Conference Proceedings

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Abstract. The aim of this work is to study heat pump cycles, using CO 2 based mixtures as working fluids. Since adding other chemicals to CO 2 moves the critical point and generally equilibrium lines, it is expected that lower operating pressures as well as higher global efficiencies may be reached. A simple stage pure CO 2 cycle is used as reference, with fixed external conditions. Two scenarios are considered: water is heated from 10 °C to 65 °C for Domestic Hot Water scenario and from 30 °C to 35 °C for Central Heating scenario. In both cases, water at the evaporator inlet is set at 7 °C to account for such outdoor temperature conditions. In order to understand the dynamic behaviour of thermodynamic cycles with mixtures, it is essential to measure the fluid circulating composition. To this end, we have developed a non intrusive method. Online optical flow cells allow the recording of infrared spectra by means of a Fourier Transform Infra Red spectrometer. A careful calibration is performed by measuring a statistically significant number of spectra for samples of known composition. Then, a statistical model is constructed to relate spectra to compositions. After calibration, compositions are obtained by recording the spectrum in few seconds, thus allowing for a dynamic analysis. This article will describe the experimental setup and the composition measurement techniques. Then a first account of results with pure CO 2 , and with the addition of propane or R-1234yf will be given.

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“…In recent years, there has been a remarkable development in mixed refrigerant systems. Single-stage vapor compression refrigerators using mixed refrigerants can provide 80~230K low temperature environment, which have been widely used in the fields of gas chiller, liquefaction, cryosurgery, cryopreservation, semiconductor fabrication, infrared sensors and water vapor trapping [1,2]. Two types of systems have been successfully developed that can reach below 230K.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the performance of a single-stage auto-cascade refrigerator

Rui

Zhang

et al. 2015

Heat Mass Transfer

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Auto-refrigerating cascade (ARC) systems possess many advantages comparing with traditional cascade refrigeration systems. This work proposed a novel ternary mixture, R600a/R23/R14, for ARC systems for 190K applications. The performance of the ternary mixture and the influences of compositional ratio and bypass scheme were assessed in a modified domestic cooler. The results demonstrated the feasibility of the proposed R600a/R23/R14 ternary mixture as an environmental benign alternative for ARC systems. The performance varied little within a certain composition range and a mass ratio of 35/30/35 for R600a/R23/R14 mixture was recommended. It also showed that the two bypass schemes, which can regulate more effectively the refrigerant compositions, were better than the conventional hot-gas bypass approach. The variation of the evaporator temperature suggested the presence of local dryout at high heat loads (i.e., larger than the design value), which should be carefully prevented.

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A study on the cycle characteristics of an auto-cascade refrigeration system

Cited by 69 publications

References 3 publications

Experimental and theoretical investigation on the performance of CO2/propane auto-cascade refrigerator with a fractionation heat exchanger

Experimental and theoretical investigation on the performance of CO2/propane auto-cascade refrigerator with a fractionation heat exchanger

Experimental study of heat pump thermodynamic cycles using CO2 based mixtures - Methodology and first results

Experimental investigation of the performance of a single-stage auto-cascade refrigerator

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