which type of heat exchanger is the lowest in temperature difference?

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• which type of heat exchanger is the lowest in temperature difference?
• 英语翻译With this type of heat exchanger,the counter current flow can be properly applied.If it is long enough,virtually all heat can be transferred from one to the other medium,i.e.,the outlet temperature of one medium is almost equal to the inflow temperature of the other medium.The choice of which medium goes through the tubes and which around the tubes is determined by the degree of pollution.The inside of the tubes is generally accessible.After commi
• 若a、b互为相反数(ab不等于0).c、d互为倒数,k的绝对值是2.
• 不定代词作定语修饰名词,请举个例子