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All these improvements resulted from cooling the air before it entersthecondenser. Theairmovingthroughtheheatexchangeris heated at constant moisture content and becomes unsaturated, there fore further improvement by adding more water is possible. Wetting the heat exchanger surface not only augments the heat transfer by mass transfer U but increases in addition the heat absorbing capacity of the air, i.e., its temperature change will be smaller andAT >AT UT7AT A (3) *CW W mw c UW>UandATmw>ATmandQCW» CD Introducing the coefficient of enhancement K yields e where or where K U AT A (3a) lCW e me UTT AT CW W mw KEn eQ, UAT QnXT=U*AT A CW me U*=UTIAT /AT W mw m m mw The rate of heat transfer in the wetted heat exchanger is The augmentation of heat transfer at the air side can be as sumed to be of no influence to the convective heat transfer of the condensing refrigerant and to the conductive heat transfer through thewall. Therefore,theapparentairsideconvectiveheattransfer coefficienth*canbedeterminedfromU*. h*,thehydraulicdiameter D of the air passage, and the thermal conductivity of moist air k na yield the Nusselt number Nu* and the augmentation of heat transfer can be expressed as Nu*A Nu. ANua = (b) Nu. is larger than the required and in a similar way as discussed above the heat exchanger area either could be decreased to A* or T^ could be lowered to T* in order to lower LMTD. This is shown schemat- c icallyintheTvs.A^plotofFig.1. Theuppermostcurverepresents C-9PDF Image | Development of the Zinc-Chlorine Battery for Utility
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