ホウレンソウの流通合理化に関する研究 (第1報)
通風予冷試験と流通過程における品温変化
1976 年 37 巻 4 号 p. 593-599
詳細
1976 年 37 巻 4 号 p. 593-599
It was researched in the variation of spinach temperature, during the air-precooling, then in ordinary truk-shipping from the cooling room in the producing district to the wholesale market in the consuming city, and before auction after arrival at the market, the following results were obtained.
1. The sufficient pre-cooling time in nonvented carton (46.5×36×15cm) in stack and in condition with enough exposure of carton to cooling-air was upward of one day.
2. The relationshp between opening ratio (ratio of the area of vent holes to carton) and half cooling time described with hyperbolic curves.
3. The position of vent holes has effects upon the cooling rate, the effectiveness of vent holes in parallel planes was remarkable more than only one plane.
4. Flowing cooling air at an angle of 45° approximately to plane with vent holes was the best effect, its half cooling time was about 2/3 of one of the parallel flow.
5. The cooling rate of non-packing spinach was fast, if the system in cargo booking and shipment is improved, air-precooling seems to be useful enough.
6. Loading and unloading by man-handling seems not to cause a special rise of temperature.
7. Transporting load covered with a 5mm thick mat made of Urethane-form for keeping at low temperature by truck, spinach temperature of about half load was about 16°C after 10 hours from shipment, then at auction the temperature of considerable spinach became over 20°C.
8. The location of the mass-average temperature in a rectangle was found by the following equation,
cosx/2aπ·cosy/2bπ=0.405
therefore, for instance, it find the location of the mass average temperature of rectangular prism being able to regard the conduction of heat as twe-dimensional at the distance 27% from the center in surface plane to the center of the prism.
