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3.5 Sizing procedure development 33 area for axial conduction have been used to re-define the axial conduction parameter. where nsC k =---:-- ax 8 S --+- kplate k s Using (3.15) and (3.16) Taking the number of plates as which gives Equation (3.19) can then be solved as eff (1 -2Ntu In) -e v 3/2Ntu . p,1 (3.18) (3.19) (3.20) (3.21) (3.22) kA 'A=~ (3.16) (3.17) The sizing equation can then be derived from equation (3.10) by re-arranging the terms and solving by substitution. The sizing equation gives the surface area required for any known desired Ntu. From (3.10), (3.11) and (3.15) Ntu _ n(1-e -2Ntuvln) n'A(1-e -2NtuJ n) +(1 +e -2NtuJn) + Ntu ____________n____________ 8C l-e -2NtuJn 3k8 -2Ntun _ -2U~Afr8 nC 8+s ~ kA 1 -2Ntuvln 2GncH2 axcr +e crpf --+ +---- A =[e 2tanh-'(-2Uj3A/lIC) + kaxAcr + 2Gpc/!} ]~A 8Ntu 8C 3k 8 fr eff plate The variation of properties of air over the temperature range in the heat exchanger is taken into account by going through the calculations for chosen increments of temperature. The effect of humidity in air has been included in the calculations. For a known number of increments, n, the hot and cold side inlet temperature, Th,i' Tc,i' and the effectiveness the size of the temperature increments, ilT, is calculated. T =e(T .-T .)+T . C,O h,1 C,I C,l I.l.T-T -T. T.-T C,O C,i_ h,1 h,o nn (3.23) (3.24) Since the heat exchanger required is a counterflow arrangement exchanging heat betweenPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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