Lesson 13
利用 压缩 压缩式 蒸汽压缩 再(细)分 把……再分成…… 吸收 射流,喷射喷射器 蒸汽喷射式
New Words & Expressions:
achieve vt. extract vt. repeated a. perform vt. cycle n. reverse a.
Lesson 13
Lesson 13
Text:
Machines that gather heat from a cold body and give it to a hot body are called refrigeration machines. Heat is transferred form a body at a lower temperature to a body at a higher temperature by a working substance (fluid) circulating in the refrigeration machine.1
工作原理, 操作原理
refrigeration n. refrigerant n.
冷藏, 致冷, 冷却 制冷剂
certain adj.;pron.
确定的, 必然的,/ 某些
ቤተ መጻሕፍቲ ባይዱequivalent n.
等(当)量
heat equivalent of work 热功当量
gather vt.
聚集,吸引
substance n.
从低温物体吸取热量并把热量传递 给高温物体的机器叫做制冷机。将热从 温度较低的物体传递到温度较高的物体 的工作是由在制冷机中循环的工质（流 体）来完成的。
Text:
Lesson 13
Refrigeration machinery in which mechanical energy is utilized is called compression-type refrigeration machine; refrigeration machines in which heat energy is utilized are subdivided into the absorption and vapor-jet type machines.
物质, 实质, 主旨
circulate vi.;vt.
(使)循环,流通
New Words & Expressions:
utilize vt. compression n. compression-type vapor-compression subdivide vt.;vi. subdivide…into… absorption n. jet n. vapor-jet type
用于制冷的工质可以是制冷剂或空气。第 一种情况，由于低温下液体制冷剂的工质汽 化状态的变化而达到制冷效果。这样的机器 叫做蒸气压缩机。第二种情况，把热量从冷 却物体转移到冷却空气进行制冷，依据这样 原理工作的制冷机叫做空气制冷机。
制冷机的工作原理是根据热力学第二 定律。要把热量从低温物体传向高温物体 就必须消耗一定量的功。
Lesson 13
Text:
The second law of thermodynamics is mathematically expressed as
Qk =Q0+L, J; (Qk = Q0+AL, kcal), Where Qk is the quantity of heat transferred to the hot body; Q0is the quantity of heat given out by the cold body; L is the work done to transfer the heat;
A=1/427 is the heat equivalent of work.
热力学第二定律的数学表达式为：
Qk =Q0+L, J; (Qk = Q0+AL, kcal),
式中 Qk是热量传向高温物体向高温物 体放出热量.
Q0 是由低温物体放出热量。 L 是所做的功转换成热。 A = 1/427 是热功当量.
完成, 达到 抽(取,排)出,萃(提)取 反复的 完成 循环,一个操作过程 相反的,可逆的
Text
Lesson 13
The principle of operation of refrigeration machines is based on the second law of thermodynamics. A certain amount of work has to be done to transfer heat from a cold body to a hot body.
利用机械能的制冷机叫做压缩式制 冷机。利用热能的制冷机可再分为吸收 式和蒸气喷射式两种。
Lesson 13
Text:
The working substance used in cooling may be refrigerants or air. In the first case the cooling effect is achieved as a result of a change in the state of the working substance-boiling of a liquid are called vapor-compressing machines. In the second case cooling is achieved as a result of transfer of heat from the cooled product to cold air. Refrigeration machines working on this principle are called air refrigerators.
制冷与空调专业英语
Lesson 13 Thermodynamic Principles of Refrigeration
New Words & Expressions Text Notes to the Text Exercise
Lesson 13
New Words & Expressions
principle of operation