The PLC unit and the touch screen are employed for local control of the system to achieve precise adjustment to the temperature of heat source, the speed and flow of air.
控制系统用PLC作为下位机进行现场控制，通过触摸屏输入开关、频率、温度等信号，实现对使用的热源温度，风速，流量等进行精确的调节。
When the temperature of heat source is relatively low, the falling film generator in the lithium bromide absorption machine can improve its heat and mass transfer performance.
热源温度较低时，在溴化锂吸收式制冷机或热泵中使用降膜式发生器可以改善传热传质的性能。
To raise the temperature of an object, it is necessary either to add heat to it from some source at higher temperature or to do work on it.
要提高一个物体的温度，必须从一个温度较高的热源给这一物体加热或者对它作功。
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