Thermal/physical properties affect predicted weight loss of fresh peaches

Many product thermal/physical properties used as model inputs are highly variable and some have not been independently determined. The chosen values of these properties can affect the accuracy of weight loss predictions. Peaches were selected as the product to study and three parameters, skin mass t...

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Bibliographic Details
Published inTransactions of the ASAE Vol. 42; no. 4; pp. 1047 - 1053
Main Authors Whitelock, D.P, Brusewitz, G.H, Ghajar, A.J
Format Journal Article
LanguageEnglish
Published 1999
Subjects
fresh products
peaches
physical properties
postharvest losses
thermal properties
weight losses
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Summary:Many product thermal/physical properties used as model inputs are highly variable and some have not been independently determined. The chosen values of these properties can affect the accuracy of weight loss predictions. Peaches were selected as the product to study and three parameters, skin mass transfer coefficient (k(s)), vapor-pressure lowering effect of dissolved solutes (VPL), and radius were identified as having considerable influence on predicted weight loss at 5 to 25 degrees C, 50 to 100% RH, and 0.005 to 5.0 m/s air velocity conditions. The effects of k(s) on predicted weight loss decreased with higher relative humidity and air velocity and lower temperature. VPL affected predicted weight loss most at higher temperature, and lower velocity and relative humidity. Varying input values of k(s) and VPL resulted in predicted weight loss ranges that encompassed 71% of experimental weight loss values for peaches and those values not falling within the predicted values were mostly (88%) underpredicted.
ISSN:0001-2351
2151-0059
DOI:10.13031/2013.13252