Regenerator Desiccant Solution Mass Flow Rate Effect

Figure 3.23 presents the effect varying the inlet desiccant solution mass flow rate in each channel has on the performance of the regenerator. The investigated

Fig. 3.23 a, b Desiccant solution mass flow rate effect on regenerator performance

range of desiccant solution mass flow rates per channel is 0.0003-0.003 kg s^{-1}, this equates to a volumetric desiccant flow range of 0.5-5 L min^{-1} through the whole regenerator. Figure 3.23a demonstrates that as the solution mass flow rate increases above 0.001 kg s^{-1}, the outlet solution temperature increases, and the outlet solution concentration decreases. Figure 3.23b demonstrates that the air absolute humidity difference and latent effectiveness both increase with increasing solution mass flow rate. In order for the desiccant air conditioning system to be balanced, the mass condensed in the dehumidifier needs to be evaporated off in the regenerator. Therefore a desiccant solution mass flow rate must be selected such that this is satisfied. In the theoretical analysis, the desiccant solution flow rate is equal in both the dehumidifier and regenerator. Mass balance is achieved by heating the desiccant solution to an adequate temperature. This is discussed next in Sect. 3.5.2.4.