SUMMARYRecently a diffusion-driven desalination (DDD) process has been described as a method for distilling mineralized water. Extensive studies have already examined the performance of the process using waste heat in water streams. This work focuses on the performance of the diffusion tower (evaporator) using waste heat in air streams. Both experimental and parametric investigations are included. It is observed that the evaporation process is very inefficient when heated air and ambient water are input to the diffusion tower. In contrast, efficient evaporation is achieved when both heated air and heated water are input to the diffusion tower. An industrial application is considered where a waste heat air stream at 828C is available and a recuperative heat exchanger is used to heat the feed water. It is found that the optimum operating conditions include an air mass flux of 1:5 kg m À2 s À1 ; an air to feed water mass flow ratio of 10 in the diffusion tower and a fresh water to air mass flow ratio of 2 in the direct contact condenser. At these operating conditions, a fresh water production efficiency of 0.22 and a specific energy consumption of 0:0012 kW h kg À1 can be achieved. The analytical model used to analyze the performance of the DDD process agrees well with the experimental measurements.
A series of iT-edges of transition elements in ionic compounds are presented. It is found that absorption in the 3d region is most prominent in cases where the bonding is least ionic and the symmetry is lowest. As the 3d levels become progressively filled, this low-lying absorption disappears.
Bioelectric potentials are considered by BURR (2) to be a vital part of life processes, and any change affecting life processes is bound to exert an effect on these potentials. There is little doubt that radiation injury exerts a profound effect on the potentials of the avian embryo, as shown by ROMANOFF and BLESS (7)
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