This is a special case of countercurrent gas-liquid contact in which the liquid enters the equipment at the adiabatic-saturation temperature of the entering gas. This can be achieved by continuously reintroducing the exit liquid to the contactor without removal or addition of heat, as shown in Figure (8.11). becomes

(a) For \(Y^{\prime}{ }_{a s}\) constant, show that, integrating equation (8-36)

(b) A horizontal spray chamber with recirculated water is used for adiabatic humidification and cooling of air. The active part of the chamber is \(2 \mathrm{~m}\) long and has a cross section of \(2 \mathrm{~m}^{2}\). With an air flow rate of \(3.5 \mathrm{~m}^{3} / \mathrm{s}\) at a dry-bulb temperature of \(338 \mathrm{~K}\) and \(Y^{\prime}=0.017 \mathrm{~kg}\) water \(/ \mathrm{kg}\) dry air, the air is cooled and humidified to a dry-bulb temperature of \(315 \mathrm{~K}\). If a duplicate spray chamber operated in the same manner were to be added in series with the existing chamber, what outlet conditions would be expected for the air?

(c) Calculate the make-up water flow rate.

Transcribed Image Text:

Gdy kya (Y-Y') dz = Make-up liquid, T as G Gx2 G's T as Y' 2 T'G2 G's Gx1 Y' T T'G1 as (8-36) Figure 8.11 Recirculating liquid-gas humidification and cooling.