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Refrigerant mass charge distribution in a domestic refrigerator. Part II: Steady state conditions
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.
KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Applied Thermodynamics and Refrigeration.ORCID iD: 0000-0002-9902-2087
2006 (English)In: Applied Thermal Engineering, ISSN 1359-4311, E-ISSN 1873-5606, Vol. 26, no 8-9, 866-871 p.Article in journal (Refereed) Published
Abstract [en]

Experimental results are presented of the refrigerant mass charge distribution in a steady state operating domestic refrigerator at varied thermal loads. It was found that the charge decreased in the evaporator and increased in the condenser and compressor upon increased thermal load. No subcooling or superheat was observed over the range of capacities tested (74-145 W). The combination of a low side accumulator and an expansion device with high capacity (short capillary tube) explained this. The study suggests that a capillary tube throttled cooling system, with a floating condensation temperature, can handle large load variations without becoming destabilised (superheat or subcooling) just like a more sophisticated thermostatic expansion device control system.

Place, publisher, year, edition, pages
2006. Vol. 26, no 8-9, 866-871 p.
Keyword [en]
domestic refrigerator, charge inventory, capillary tube, capillary-tube flow, dynamic simulation, cycling losses, freezer, model
URN: urn:nbn:se:kth:diva-15552DOI: 10.1016/j.applthermaleng.2005.10.004ISI: 000236308200012ScopusID: 2-s2.0-29244461751OAI: diva2:333593
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2012-04-11Bibliographically approved
In thesis
1. Energy Efficiency Improvements in Household Refrigeration Cooling Systems
Open this publication in new window or tab >>Energy Efficiency Improvements in Household Refrigeration Cooling Systems
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is based on eight articles all related to the characteristics of the cooling system and plate evaporator of a household refrigerator. Through these articles, knowledge is provided that can be used to increase the operational efficiency in household refrigeration. Papers A, B and C focus on heat transfer and pressure drop in a commonly used free convection evaporator – the plate evaporator. Applicable correlations are suggested on how to estimate the air side heat transfer, the refrigerant side pressure drop and the refrigerant side heat transfer. Papers D, E and F hold a unique experimental study of the refrigerant charge distribution in the cooling system at transient and steady state conditions. From this cyclic losses are identified and estimated and ways to overcome them are suggested. In paper G the topic “charging and throttling” is investigated in an unparalleled experimental study based on more than 600 data points at different quantities of charge and expansions device capacities. It results in recommendations on how to optimize the capillary tube length and the quantity of refrigerant charge. Finally, Paper H holds a thermographic study of the overall cooling system operating at transient conditions. Overall, a potential to lower the energy use by as much as 25 % was identified in the refrigerator studied. About 10 % was found on the evaporator’s air side. 1-2 % was identified as losses related to the edge effect of the evaporator plate. About 8 % was estimated to be cyclic losses. About 5 % was found in cycle length optimization.  It is believed that most of these findings are of general interest for the whole field of household refrigeration even though the results come from one type of refrigerator. Suggestions of simple means to reduce the losses without increasing the unit price are provided within the thesis

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 115 p.
TRITA-REFR, ISSN 1102-0245 ; 12:02
Household refrigerator, Domestic refrigerator, Free convection, Plate evaporator, Heat transfer, Flow boiling, Isobutane, R600a, Pressure drop, Two-phase, Cooling system, Charge inventory, Cyclic losses, Thermography
National Category
Energy Engineering
urn:nbn:se:kth:diva-93061 (URN)978-91-7501-306-0 (ISBN)
Public defence
2012-04-27, F3, Lindstedtsvägen 26, Stockholm, 10:00 (English)

QC 20120411

Available from: 2012-04-11 Created: 2012-04-10 Last updated: 2014-02-11Bibliographically approved

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