. Cooling apples in pallet boxes. Figure 27.—32-point temperature recorder, hand-balanced potentiometer, and circular-chart temperature recorder used in cooling tests. the test period and the number of hours in the period were noted. With the foregoing information, the cooling coefficient for each test location was calculated by the following formula: C=- Temperature range. Figure 28.—Wires from thermocouples leading to record- ing potentiometer. (hours in period) (average fruit temper- ature—average air temperature) C is expressed as degrees Fahrenheit per hour per degree-temperature-differen
. Cooling apples in pallet boxes. Figure 27.—32-point temperature recorder, hand-balanced potentiometer, and circular-chart temperature recorder used in cooling tests. the test period and the number of hours in the period were noted. With the foregoing information, the cooling coefficient for each test location was calculated by the following formula: C=- Temperature range. Figure 28.—Wires from thermocouples leading to record- ing potentiometer. (hours in period) (average fruit temper- ature—average air temperature) C is expressed as degrees Fahrenheit per hour per degree-temperature-difference between fruit and air. An average cooling coefficient was determined by averaging the four test values for each type of box and this average was converted to half- cooling time, Z, by the formula: r, i • i x loge 2 L (in hours) = ° - \j Half-cooling time, Z, is the time required for the fruit to cool through 50 percent of the differ- ence between the initial fruit temperature and the air temperature, assuming a constant air tempera- ture. Roughly, this approximates removal of V2 of the field heat. A period of 2Z is required for removal of % of the field heat; a period 3Z for removal of % of the field heat. Determination of Stabilized-Temperature Difference and Its Meaning Stabilized-temperature difference (or approach temperature, as it is sometimes called) is the difference between fruit temperature in the center 23. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Patchen, Glenn O. , 1906-; Sainsbury, G. F. (George F. ), 1913-. Washington, D. C. : Agricultural Marketing Service, Transportation and Facilities Research Division, U. S. Dept. of Agriculture
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