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heat recovery. 5.1. Mass Flow Rate (MFR) of Inlet Air Effect on Freshwater Production The intake of MFR of air is an important parameter in a desalination unit because it determines the blowing power. Therefore, simulations are carried out to observe the influence of MFR of air on Mathematics 2021, 9, 33 20 of 31 water productivity with and without waste heat recovery from the condensing coil and it is presented in Figure 7. Figure 7. EFffiegcutroef7M. EFfRfeocft aoifrMonFRfreosfhawiraotnerfprersohdwuactievriptyrowdiuthctaivnidtywitihthouant dwawsittehhoeuattwreacsotevehreya.t recovery. It is observed that the water productivity is increased with the increase in MFR of air It is observed that the water productivity is increased with the increase in MFR of air because because the tendency of moisture transfer increases; therefore, water productivity attains a the tendency of moisture transfer increases; therefore, water productivity attains a maximum value maximum value at 500–800 kg/h of MFR of air. However, water productivity decreases at 500–800 kg/h of MFR of air. However, water productivity decreases significantly after 1100 kg/h of significantly after 1100 kg/h of MFR of air. It is because very high values of MFR of air do MFR of air. It is because very high values of MFR of air do not give sufficient time to an air in the not give sufficient time to an air in the humidification section to cause effective evaporation; humidification section to cause effective evaporation; therefore, as a result, the water productivity therefore, as a result, the water productivity decreases. Dai et al. [75] recommended a decreases. Dai et al. [75] recommended a range of 500–800 kg/h of the MFR of air for the HDH range of 500–800 kg/h of the MFR of air for the HDH desalination unit, which can be desalination unit, which can be also observed here. It is also observed that elevating the temperature also observed here. It is also observed that elevating the temperature of the saline water of the saline water also increases the productivity of freshwater. However, it is deduced from Figure also increases the productivity of freshwater. However, it is deduced from Figure 5 that 5 that recovering the heat from the condensing coil by reusing the feedwater in the brackish water recovering the heat from the condensing coil by reusing the feedwater in the brackish storage significantly increases the freshwater productivity. It is reported that ~14% of freshwater water storage significantly increases the freshwater productivity. It is reported that ~14% productivity is inocfrferaesehdwfaotreranprModFuRctoifv8it0y0iskgin/hcrbeayswedasftoer haenaMt rFeRcoovfe8re0d0 kfrgo/mh tbhye wcoansdteenhseiantgreccooilvered at a saline waterftreomptehraetcuornedoefn8s5in°gC.coil at a saline water temperature of 85 ◦C. 5.2. Mass Flow Rate (MFR) of Saline Water Effect on Freshwater Production 5.2. Mass Flow Rate (MFR) of Saline Water Effect on Freshwater Production Several simulations are carried out to observe the effect of MFR of saline water Several simulations are carried out to observe the effect of MFR of saline water on freshwater on freshwater productivity from the dehumidifier/condenser. It can be observed from productivity from the dehumidifier/condenser. It can be observed from Figure 8 that an increase in Figure 8 that an increase in the MFR of the saline water increases the water production the MFR of the saline water increases the water production rate. It is because a high MFR of saline rate. It is because a high MFR of saline water contributes to a high Reynolds number, water contributes to a high Reynolds number, thus increasing the heat transfer coefficient between thus increasing the heat transfer coefficient between the water and air mixture in the the water and air mixture in the humidification section, which yields higher values of water humidification section, which yields higher values of water productivity. It can also observe productivity. It ctahnaatlisnocroebaseinrvgeththeastailnincerewasaitnegr tehmepsaelrianteuwreaitnecrreteamsepsetrhaetufrreeshinwcaretearsepsrothdeufcrteivshitwy.aStienrce the productivity. Sinmceastshetramnassfsertrcaonesfffiecriecnotefifsicaiesnttroisnga fsutrnocntigonfuonfctieomnpoefratetumrpe,ertahteurreef,orthe,erietfcooren,triitbutes contributes towatordwsaradsmaomreoreeffefcfteicvteivemmasasstrtraannssffeerr of watterrvvaappoouursrstotaoira. iFru. rFthuertrhmeormre,oirtei,siotbiserved that the freshwater productivity also increases by waste heat recovered. Here, an increase observed that the freshwater productivity also increases by waste heat recovered. Here, an increase of ~15% in water productivity is reported by waste heat recovery from the condensing coil for a saline water MFR of 1800 kg/h at a water film temperature of 85 ◦C.PDF Image | Humidification Dehumidification Solar Desalination System
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