Air circulation carries product heat and the heat which penetrates the walls, floors, and ceiling of the trailer to the refrigeration unit where it can be removed.
空气在循环过程中会带走农产品本身的热量，也会带走那些从门、地板和拖车的顶部渗透进来的热量。
2
James Joules The physicist James Joules, after we we call after him the unit of work was the first to demonstrate that heat energy and mechanical energy are really equivalent.
物理学家，我们以他命名功的单位,他是第一个演示出,热能和机械能相等的人。
3
Jug kettles are fast and convenient, but their fuel - electricity from the national grid - produces almost three times more greenhouse gas for each unit of heat than burning gas in the home does.