Search

This paper discusses the importance of per-cooling vegetable and fruit, establishes a mathematical model of the solar adsorption refrigeration system collector bed. It applies activated carbon - methanol as working pairs, takes solar vacuum tube－water cooled collector bed for refrigerating, adsorption temperature and adsorption rate versus time are calculated , draw the corresponding curve figure. Analyses solar adsorption refrigeration system performance and puts forward the improvement direction.

It is very meaningful to predict the temperature and thawing time during the thawing process of frozen food in production and life, this paper proposes a physical model of cylindrical frozen food during the thawing process, combine the finite difference method with element balance method to solve the thawing time and the temperature at regional center R/2 and boundary nodes. Take the beef as an example for the experimental verification. Through numerical calculation and experimental verification, the maximum error between the theory thawing time and experiment is 8.4%. The results show that: it is highly consistent with the experimental results that using numerical method to predict the thawing time and temperature change curve, at the same time, the temperature maximum error in center area is 1.2°C, the temperature maximum error of R/2 is 0.8°C, the temperature maximum error of the boundary node is 1.5°C, so the numerical simulation in studying thawing of freezing food is fairly reliable.