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 , . Faith A. Morrison, Michigan Tech Exchanger EffectivenessConsider a counter-currentdouble-pipe heat Exchanger :coTciT hoThiThiThoTciTcoTdistance along the Exchanger Faith A. Morrison, Michigan Tech balance cold side:()()cicocoldpcoldinTTmCQQ ==,Energy balance hot side:()()hihohotphotinTTmCQQ = =,()()()()hchihocicocoldphotpTTTTTTmCmC = = Faith A. Morrison, Michigan Tech profile in a double-pipe heat Exchanger :xeTTTT011 = =mCmCRUpp 1 120 Faith A.
The heat capacity of the oil is 1.89 kJ/kg K, and the average heat capacity of water over the temperature range of interest is 4.192 kJ/kg K. The overall heat-transfer coefficient of the exchanger is 300 W/m2 K, and the area for heat transfer is 15.4 m2. What is the total amount of heat transferred? ©Faith A. Morrison, Michigan Tech U.
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