Validation Summary

Sections 3.4.1 and 3.4.2 have validated to a suitable degree the developed dehumidifier and regenerator models. Experimental data for a membrane based dehu- midifier/regenerator HMX operating with a LiCl desiccant solution has been published by Ge et al. (2014). The experimental results have been compared with the developed model. Overall the model seems to be working within an acceptable error range for the variables required to assess a desiccant air conditioning system. The model can therefore be used with confidence in the parametric analysis presented in Sect. 3.5 and the tri-generation system model in Chap. 4.

Potential reasons for the discrepancies between experimental and simulations have been identified for both the dehumidifier and regenerator, these are:

  • • Average values of experimental conditions were used as the modelling input.
  • • The air flow across the membrane creates a small angle with the falling desiccant solution in the experimental testing; however, for simplicity it was assumed parallel in the modelling work.
  • • Total coverage and full wetting of the membrane material with the desiccant solution may not have been achieved in the experiments, whereas it was assumed in the modelling.
  • • Perfect contact between the air and desiccant solution may not have been achieved in the experiments, whereas it was assumed in the modelling.
  • • The authors do not state the experimental error for the performance variables used in model validation, therefore the actual difference between experimental and modelling may be less, and within the ±10 % margin.
  • • Measurement of the exact desiccant solution mass concentration is a challenging aspect of the experimental work and as demonstrated in Sect. 3.5, a small variation in the desiccant solution mass concentration has a large influence on dehumidifier/regenerator performance.

Section 3.4 has experimentally validated the desiccant dehumidifier and regenerator models to within an acceptable range. Experimental validation with a CHKO2 solution is presented in Sect. 6.3. Next, using the validated models, Sect. 3.5 provides a parametric analysis for both the dehumidifier and regenerator.

 
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