Simplified Mass and Energy Balances Fluid A Fluid B mA,inlet =mA,exit =mA mB,inlet mB,exit =mB QA=mA(hAexit-hAinlet QB=mB(hB.exit-hB.inlet) Relationship Between Fluid Heat Transfer Rates QA=-QB Entire Heat Exchanger (both fluids) Fluid B CV boundary Fluid B CV boundary mA hA.exit mB hB.exit =mA hAinlet+mg hBinlet Fluid A Heat Fluid A or Heat mA(hA.exit-hAinlet)=mB(hB inlet-hB.exit) (a)System:Entire heat (b)System:Fluid A (Ocv0) exchanger (Ocy =0) 上游充通大 April 3,2019 4 SHANGHAI JIAO TONG UNIVERSITYApril 3, 2019 4 Simplified Mass and Energy Balances Fluid A mA,inlet  mA,exit  mA Fluid B mB ,inlet  mB ,exit  mB QA  mA (hA,exit - hA,inlet) QB  mB (hB ,exit - hB ,inlet ) Entire Heat Exchanger (both fluids) mA (hA,exit- hA,inlet)  mB (hB ,inlet - hB ,exit ) mA hA,exit + mB hB,exit  mA hA,inlet + mB hB,inlet or QA  -QB Relationship Between Fluid Heat Transfer Rates