What is the heat transfer efficiency that can be achieved by a heat exchanger? !
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If heat dissipation is removed, the heat transfer efficiency of the heat exchanger can reach 100%, right? ! Really?
It can’t be 100 percent; there is thermal resistance.
Thermal resistance is the resistance to the driving force of heat transfer. It’s not the resistance of heat. Heat, that is, energy, is not lost due to thermal resistance.
Isn’t the efficiency of a heat exchanger simply the efficiency of heat transfer?
If heat exchangers are used to recover heat, must the heat from the higher temperature area be transferred to the lower temperature area in order to be recovered? If less heat is transferred over, can the recovery efficiency still be high?
Stop talking about concepts. Heat transfer can be measured by the heat transfer coefficient; when this coefficient is low, the heat exchange area can be increased to boost the total amount of heat transferred. It is not the same concept as the energy recovery rate.
It’s quite interesting. The OP’s question can be explained by the law of conservation of energy; so it’s unclear what there is to argue about. There is a concept of efficiency in heat exchangers. The limit of a heat exchanger is reached when the outlet temperature of the cold stream equals the inlet temperature of the hot stream, or vice versa. Wouldn’t it be better to discuss things using this reference point?
Let’s not discuss the heat exchange efficiency of the heat exchanger; according to the law of conservation of energy, the heat lost is equal to the heat gained, so it’s 100% in both cases. It should be like this, right?
I think it should be that way too.