Analysis of the expansion valves used for controlling refrigerant feed into delicatessen cabinets in supermarkets

被引:4
作者
Maidment, GG
Missenden, JF
James, RW
Tozer, RM
机构
[1] Univ Nottingham, Sch Built Environm, Nottingham NG7 2RD, England
[2] S Bank Univ, Sch Engn Syst & Design, London SE1 0AA, England
[3] Waterman Gore Consulting Engineers, London SE1 8ND, England
基金
英国工程与自然科学研究理事会;
关键词
cooling; delicatessen; cabinet; drying; expansion device; retail display; refrigeration; short tube restrictor; supermarket; TEV; unwrapped food; weight loss;
D O I
10.1016/S0260-8774(99)00036-9
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Delicatessen cabinets can be found in most supermarkets and are used to retail and display unwrapped chilled foods, including fresh and cooked meats, salads and pies. High operating costs for these cabinets have been regularly reported and this is mainly due to evaporation losses which occurs whilst unwrapped food is on display. One of main reasons for this has been cited to be low humidity within the display area, however, the cause of this is not clear. The role of the expansion device in the poor performance of the delicatessen cabinet is examined in this paper. This includes the results from a practical and theoretical investigation into the behaviour of thermostatic expansion valves (TEV) in the delicatessen cabinet. This showed standard expansion valve designs to be unstable and to constrain the level of humidity achieved in the display area. Alternative expansion devices are reviewed and the performance of the short tube restrictor device modelled. This has shown that this device will overcome the shortcomings of the traditional expansion devices and will significantly reduce the operating costs of the delicatessen cabinet. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:47 / 58
页数:12
相关论文
共 22 条
[1]  
*ASHRAE, 1994, ASHRAE REFR HDB, P44
[2]  
BAILEY C, 1990, P I REFR 1989 1990
[3]  
BOGHSORENSEN L, 1990, CHILLED FOOD STATE A
[4]   HUNTING OF EVAPORATORS CONTROLLED BY A THERMOSTATIC EXPANSION VALVE [J].
BROERSEN, PMT ;
VANDERJAGT, MFG .
JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME, 1980, 102 (02) :130-135
[5]  
DENG SM, 1991, THESIS S BANK U
[6]  
DOSSAT RJ, 1981, PRINCIPLES REFRIGERA
[7]  
*EES, 1996, ENG EQ SOLV VER 4 29
[8]  
*EN EFF OFF, 1994, 223 DEP ENV EN EFF O
[9]  
GRAHAM W, 1995, COMMUNICATION 0512
[10]  
GRIFFITHS E, 1951, REFRIGERATION PRINCI, P218