PREDICTION OF TIME-TEMPERATURE HISTORY OF SELECTED FOOD INPUT INTO THE REFRIGERATED DISPLAY CABINET
Recently the surface heat transfer coefficient (SHTC) versus temperature difference ΔT correlations have been extracted from experiments with plastic cups filled with metal models of foods input into the refrigerated display cabinet, Hoke et al. (2007). These correlations have been applied for numerical prediction of time-temperature histories of model food – fresh cheese known as a quark. Experimental verification of calculated predictions was made. The cups filled with quark have been input into refrigerated display cabinets. The cups, geometry and arrangement of experiment used were identical as that used for prediction of correlations of heat transfer coefficients. Three sizes of cups and three arrangements of layers of cups have been studied (cup standing alone on the floor of display cabinet, one layer of cups, three layers of cups eventually two layers of cups). Surrounding cups are tempered on the room temperature or on the temperature of the air in the display cabinet. The calculated and measured time-temperature histories of quark in cups were compared. Good agreement was found in cases that cups with quark are standing alone or in layers between surrounding cups having the temperature of air in the display cabinet. The agreement between calculated and measured quark temperatures was found unsatisfactory for the arrangement in which the surrounding cups have the initial temperature of quark and this temperature is equal to the room’s temperature. In these cases, the maximum temperature differences between experiment and calculation have been found about 3℃ at the end of the observed time scale near time of temperature equilibrium.
Karel Hoke Jirina Pruchova Karel Kyhos Ales Landfeld Rudolf Zitny Milan Houska
Food Research Institute Prague,Radiova 7, 102 31 Prague 10 Faculty of Mechanical Engineering, Czech Technical University Prague Czech Republic
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）