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i don't know how to consider the en

i don't know how to consider the en

i don't know how to consider the en

(OP)
i don't know how to consider the energy lost that can be regarded as one important factor which leads the  extension of time constant when the outlet temperature reach the steady state in a heat recovery wheel operated in a ventilation unit equiped with a counter flow heat exchanger.

i need help from people here!
thanks a lot!

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