Transcription of Heat Exchanger Effectiveness
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Heat Exchanger Effectiveness
1 heat Exchanger Effectiveness ()lmTmTFUATUAQ = =()()()()22112211lnTTTTTTTTTlm = To calculate Q, we need both inlet and outlet temperatures:1T 2T 2T1 TWhat if the outlet temperatures are unknown? calculate the performance of a given heat Exchanger . Faith A. Morrison, Michigan Tech :1. guess outlet temperatures2. calculate Tlm, FT3. calculate Q4. calculate Qfrom energy balance5. compare, adjust, calculate unknown outlet temperatures:This tedious procedure can be simplified by the definition of heat - Exchanger Effectiveness .
Q A=∞ = mC phot T −T this temperature difference only depends on inlet temperatures hot side: T hi T ho=T ci T co distance along the exchanger ©Faith A. Morrison, Michigan Tech U. =∞ ≡ Q A Q Heat Exchanger Effectiveness, ε ε ( ) hi ci ⇒Q=εmC phot T −T hot fluid = minimum fluid if ε is known, we can calculate Q without ...
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