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8. The water film should flow laminarly in order to he thin, of smooth surface, and steady. 9. Itisassumedthattheinterfacialareaisequaltothe wetted fin area. 10. Calculationsarebasedontheconstanttemperatureofthe refrigerant Tc in the condensation process. The values of the thermodynamical properties of the refrigerant R-12 are specified for the temperature of condensation T = ^0°C. h. MethodofAnalysisofCombinedHeatandMassTransferandDeter mination of Changes of State of Air and Water in the Wetted Heat Exchanger The system for the analysis is shown in Fig. 6, representing a control volume in one of the passages (elemental channel) of the con densercoil. Forreasonsofgeneralitythewallsareassumedtobe __f- Tcr_- 1p xA.iA / i-myip-L, —ijy -qWH—Tc ■ 'dAp2- - - ___ “L “ B----- ~ -• - ....7 .,7..-.....-.....r....-r,; /- VA ■ "a ■1' , 1 \. r j- ^ ^ -XA+dXA >A+d1A1 A1 'Jwl^lvv ' -J l- I ! Figure 6. Evaporation in a channel heated both at wetted and unwetted walls. onlypartiallywetted. Thisflowarrangementwouldoccurinahori zontal channel where only the lower part is filled with water, dry heat transfer occurs at the upper wall surface. The system in prin ciple represents heat transfer from one fin having one dry and one wettedsurface. ItIsassumed(onlyatpresent)thatthefineffi ciency is unity, i.e., the wall temperature is not influenced by conduction along the fins but governed by overall heat transfer from C-13PDF Image | Development of the Zinc-Chlorine Battery for Utility
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