Development of high efficiency cycles for domestic refrigerator-freezer application

Yang, Mina; Jung, Chang Jin; Kang, Yong Tae

doi:10.1016/j.energy.2015.10.127

Cited by 21 publications

(4 citation statements)

References 28 publications

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“…Concerning the first group, studies by researchers such as Avci et al (2016), Belman-Flores et al (2014), Kumlutaş et al (2012), Laguerre et al (2010), Amara et al (2008), Gupta et al (2007) and Laguerre et al (2007) have used CFD (Computational Fluid Dynamics) models to identify and optimise the main design parameters, thermal stratification and air flow issues so as to improve the energy efficiency of domestic cold appliances. Other researchers such as Yang et al (2015) have developed new refrigeration cycles based on a 2-stage vapour compression cycle. Yoon et al (2013) showed that the choice of insulation, in terms of type of material and thickness, enabled high energy savings to be achieved.…”

Section: Technical Featuresmentioning

confidence: 99%

Temperature and energy performance of domestic cold appliances in households in England

Biglia

Gemmell

Foster

et al. 2018

International Journal of Refrigeration

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Highlights Temperatures and energy consumed by 998 cold appliances in households are reported. Mean refrigerator temperature was 5.3°C; the mean freezer temperature was -20.3°C. Mean electricity consumption was 354 kWh per year. Differences between cold appliance types were determined from statistical analysis. AbstractThis paper reports the results of a large-scale survey in which 998 cold appliances were monitored in 766 properties in England. No surveys published to date analyse such a large dataset, which includes data on ambient temperature, cold appliance temperature (refrigerator and/or freezer) and electricity consumption of the cold appliance. Simultaneous measurements of the temperature inside and outside of the cold appliances and the electricity consumption were taken over a period of seven days during a ninemonth period in 2015. An interview was also conducted with the householders to collect further information about the cold appliances and their usage patterns. The cold appliances monitored in the work included fridge-freezers (52%), refrigerators with ice-box (6%), larder fridges (14%), chest freezers (9%) and upright freezers (19%). It was found that for all monitored cold appliances with valid data that: the mean ambient temperature was 18.5°C; the mean refrigerator temperature was 5.3°C; the mean freezer temperature was -20.3°C; and the mean electricity consumption was 354 kWh per year. Significant differences between the electricity consumption of different types of cold appliance were determined from statistical analysis.

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Section: Technical Featuresmentioning

confidence: 99%

Temperature and energy performance of domestic cold appliances in households in England

Biglia

Gemmell

Foster

et al. 2018

International Journal of Refrigeration

View full text Add to dashboard Cite

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“…Many household refrigeration cycles such as those used in refrigerators, air conditioners, dehumidifiers, and water purifiers are applied globally; consequently, several studies on improving the energy efficiency of household refrigeration cycles have been conducted [1][2][3][4][5][6][7][8][9][10]. The major irreversible losses in the household refrigeration cycle are generated by the throttling process, which requires the use of capillary tubes or an electrical expansion valve.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nozzle Exit Position on Condenser Outlet Split Ejector-Based R600a Household Refrigeration Cycle

et al. 2020

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The objective of this study is to investigate the performance characteristics of a small-sized R600a household refrigeration system that adopts a condenser outlet split (COS) ejector cycle under various operating and ejector geometry conditions. The coefficient of performance and pressure lifting ratio of the COS ejector cycle were analyzed and measured by varying the entrainment ratio, compressor speed, and nozzle exit position. The optimum nozzle exit position in the COS ejector cycle adopted to achieve the maximum cycle performance was proposed as a function of the compressor speed and entrainment ratio. The optimum nozzle exit position was 0 mm when the entrainment ratio and compressor speed were low, and it increased as the entrainment ratio and compressor speed increased owing to the associated internal pressure drop in the suction section.

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“…Nevertheless, only a few studies have been focused on alternative cycle arrangements with phase separators for HC-600a household refrigerators. Yang et al (2015), for example, conducted a simulation study considering four different two-stage cycles and concluded that the highest coefficient of performance (COP) is achieved when the evaporators are connected in series and the compressors in parallel. On the other hand, phase separators, particularly T-junctions, have been extensively investigated by Milosevic (2010) and Tuo and Hrnjak (2014) for typical automotive air conditioning conditions using HFC-134a.…”

Section: Introductionmentioning

confidence: 99%

A design approach for liquid separators applied to household refrigerators

Janke

Silveira

Melo

2019

International Journal of Refrigeration

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The objective of this study was to develop a methodology for designing T-junction liquid-vapor separators for household refrigerators. The influence of the following independent parameters on the separator performance was studied: i) refrigerant mass flow rate, ii) inlet vapor quality, iii) phase-separation temperature, iv) critical droplet diameter and v) suction ratio. For modeling purposes, the T-junction was divided into three sub-models, namely: inlet, vapor and liquid branches. The inlet branch sub-model revealed that proper phase separation occurs with larger diameters as the refrigerant mass flow rate and vapor quality increase. The dimensions of the vapor branch are governed by the droplet diameter, vapor mass flow rate and phase-separation temperature, while the dimensions of the liquid branch are dictated by residence time, suction ratio and vapor quality. Additionally, a testing facility was designed and constructed to visualize the refrigerant flow through acrylic T-junctions mounted in a novel two-stage cycle architecture. A T-junction with an inlet branch diameter of 7 mm, a vertical branch diameter of 28 mm and total length of 58 mm was tested with compressor speeds ranging from 2000 to 3500 rpm and suction ratios from 10 to 45%. Photographs of the flow pattern through the separator were taken and used to explain the measured results.

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Development of high efficiency cycles for domestic refrigerator-freezer application

Cited by 21 publications

References 28 publications

Temperature and energy performance of domestic cold appliances in households in England

Temperature and energy performance of domestic cold appliances in households in England

Effects of Nozzle Exit Position on Condenser Outlet Split Ejector-Based R600a Household Refrigeration Cycle

A design approach for liquid separators applied to household refrigerators

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