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在制冷工程中,国际单位制中压力(帕、巴),能量(焦)、功率(瓦)、热流量(瓦/米~2)以及与此相关的热导率(瓦/米·开)、放热系数、传热系数(瓦/米~2·开)等,与旧单位制的差异较大,但通过下面应用国际单位制的计算实例,就可以了解到学习国际单位制计算后,既能解决长期以来存在的重量和质量这两个概念不易搞清的问题,又能体会到运算过程的简便。为了帮助读者运用国际单位制来进行热力和传热计算,现例举了几道应用国际单位制进行计算的例题,以帮助读者了解和掌握国际单位制与旧单位制之间的关系。在所举的例题中还列出了旧单位制的对照运算过程。
In refrigeration engineering, the pressure (watts, bar), energy (coke), power (watts), heat flux (watts / meter ~ 2) and the thermal conductivity (watts / , Exothermic coefficient, heat transfer coefficient (W / m ~ 2 · ON), etc. are quite different from those of the old unit system. However, by applying the following calculation example of the SI system, we can understand that after studying the calculation of the SI system, It can not only solve the problem that the two concepts of weight and quality that have existed for a long time are not easy to figure out, but also realize the simplicity of the calculation process. To help readers use the SI system for heat and heat transfer calculations, I have given a few examples of using the SI system for calculation to help readers understand and master the relationship between the SI system and the old system of units. In the example cited also lists the old unit of control operation.