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Donaldson TanEditor, New Asia RepublicReworn down StaffSr. MemberPosts: 3178Mole Snacks: +261/-13Gender:

The devices you provide for Cp is dodgy. Cp is the molar

**warm capacity**at constant press, so its unit should be

**power per unit temperature**per mole, ie. J/K.molP: last pressureV: last volumetric flow-rateN: last molar flow-rateT: last temperatureassume air is composed of 79% Nitrogen and 21% Oxygenassume airflow behaves ideallyFrom data,P1.V1 = N1.R.T1 where:P1.V1 = 3500 N.m3/hT1 = 800C = 1073K=>

**N1 = 0.39234 mol/h**From data,P2.V2 = N2.R.T2 whereP2.V2 = 1805 N.m3/hT2 = 80C = 353K=>

**N2 = 0.61502 mol/h**assume the mixing of airflows is adiabatic, then

**P.V = P1.V1 + P2.V2 = 5305 N.m3/h**assume the mixing process is at secure state,

**N = N1 + N2 = 1.0074 mol/h**using right gas equation,

**T = P.V/N.R = 5305/(1.0074)(8.314) = 633.39K**assume mixing process is adiabatic, thenH = H1 + H2 whereH: final enthalpyH1: enthalpy of first airflowH2: enthalpy of 2nd airflowH = N.(h* + Cp.T)H1 = N1.(h* + Cp1.T1)H2 = N2.(h* + Cp2.T2)wbelow h* is referral enthalpy state (assume to be zero)Cp: last molar warm capacityCp1: molar warmth capacity of initially airflowCp2: molar heat capacity of second airflowH = H1 + H2N.(h* + Cp.T) = N1.(h* + Cp1.T1) + N2.(h* + Cp2.T2)

**N.Cp.T = N1.Cp1.T1 + N2.Cp2.T2**Cp = (N1.Cp1.T1 + N2.Cp2.T2)/N.T

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