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# project2 - 3 When the relative humidity of the process air...

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ME 426 Project #2 02.12.2008 Consider the cross-flow condenser of a dryer. Process air enters the condenser at 68ºC and 90% relative humidity with the mass flow rate of 0.030 kg/s of dry air. Cooling air enters the condenser at 25ºC with the mass flow rate of 0.040 kg/s. The cooling air is dry enough to ignore the effect of the moisture contents. The product, UA, of the overall heat transfer coefficient and the surface area is estimated to be 40 W/ ºC. Find the exit temperatures of the process and cooling airs for the following conditions: 1. When the relative humidity of the process air at the exit is 90%: 2. When the relative humidity of the process air at the exit is 95%:
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Unformatted text preview: 3. When the relative humidity of the process air at the exit is 100%: Note 1: Iteration may be necessary to find the solutions. Note 2: Properties of steam may be found in many thermodynamics books. Or you may use the following correlations: Saturation Pressure Psat in [kPa]; T in [K] Psat=EXP(-6096.9385/T+16.635794-2.711193E-2*T+1.673952E-5*T*T +2.433502*LOG(T))/10. Enthalpy HF and HG in [kJ]; T in [degC] HF=0.6446687+T*(4.16485+T*0.00019215847) HG=2500.895+T*(1.834738+T*(-0.00031842659+T*(-0.0000031198158+T*(-0.000000024703951)))) Note that you are not allowed to work together for this project....
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