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3. Temperature Data Define the Temperature variables as: t1 = Entering Water Temperature T1 = Entering Air Temperature t2 = Exiting Water Temperature T2 = Exiting Air Temperature RUN t1 t2 T1 T2 Flow H2O H2O in H2O out Air in Air out (GPM) #1 129.8 °F 89.6 ° °F 30.2 °F 80.4 °F 0.75 4. 1st Law Energy Balance Using: Q = ma2o Cp_H2O (ATH20) = mair Cp_air (ATair) Find: a) Q - heat transferred from H2O to air (Btu/hr). b) Airflow (CFM) 5. As - Calculating the Surface Area of the Heat Exchanger Using the dimensions of the Heat Exchanger from Page 1, calculate the surface area of the water side. The flattened tubes are so thin that only their width (W) needs to be considered. 6. ATLM - Calculating the Log Mean Temperature Difference (LMTD) Crossflow Heat Exchangers use a Counter Flow heat exchanger model, to determine the Log Mean Temperature Difference (LMTD) or ATtM, the best method to determine the average Temperature difference between the two fluids from one end of the heat exchanger to the other. Counter-Current Flow ti ATA T2 t2 ATB T1 Area Calculate: = LMTD = in ATA-ATB (°F). 7. Correction Factor - Fc Using the Table below, Calculate the correction factor. 1.0 T1 0.9 0.8 t1 R = 4.0 3.0 2.0 1.5 1.0 .0.8.0.6.0.4 0.2 t2 0.7 0.6 T1 - T2 R t2 - ty T2 0.5 o 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 P= 12-4 (c) Single-pass cross-flow with both fluids unmixed 1 - inlet 2-outlet t - tube side T - shell side 8. U - Calculating the Heat Exchanger Coefficient Q = U As (ATLM) Fc Calculate the Heat Exchanger Coefficient U in Btu/hr*ft²*F.

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