식품공학 냉동 과제

목차

1) Plot the temparature vs. time data for freezing the given sample, water or potato, for specified operating conditions. Identify regions of the plot that represent removal of sensible and latent heat.
2) Using the plots of temperature history for each condition, compare each plot and observe the influence of potato size and air velocity. Also discuss the effect of air velocity on the freezing time.
3) Discuss how the center temperature changes with time for samples of water and potato. Comment on the shpae of the plot.
4) Use an analytical procedure for calculating freezing time (such as Plank's or Pham's method) and compare the results with those you obtained from the experiment.

본문내용

1) Plot the temparature vs. time data for freezing the given sample, water or potato, for specified operating conditions. Identify regions of the plot that represent removal of sensible and latent heat.

지름이 10mm, 길이가 20mm인 감자의 초기온도가 40℃이고, 냉기의 온도가 -30℃, 냉동공기의 속도가 1m/s, 감자의 최종온도가 -20℃까지 온도변화에 따른 시간의 그래프이다. 파란 점은 초기온도 40℃에서 2.465℃까지, -2.791℃에서 최종온도인 20℃까 지의 구간을 나타낸 현열이고, 빨간 점은 상변화에 필요한 잠열이다.

2) Using the plots of temperature history for each condition, compare each plot and observe the influence of potato size and air velocity. Also discuss the effect of air velocity on the freezing time.

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