Modeling and Verification of Heat and Moisture Transfer in an Enthalpy Exchanger Made of Paper Membrane

Abstract

In this study, heat and moisture transfer model of an enthalpy exchanger is proposed. With separately measured sorption constant and diffusion coefficient, the model predicts the heat and moisture transfer effectiveness of an enthalpy exchanger. Two sample enthalpy exchangers were tested at a KS condition to verify the model. The model predicts the heat transfer effectiveness within 4%, and the moisture transfer effectiveness within 10%. Pressure drop is predicted within 6%. The spacer fin efficiency for heat transfer was 0.11 to 0.13. The fin efficiency for moisture transfer, however, was negligibly small. For heat transfer, the conduction resistance to total thermal resistance was less than 1%. For moisture transfer, however, membrane resistance was dominant to convective moisture transfer resistance.

Development of a performance model for classifying broiler farms

“…That tree' branch presents the minority classes that represents the most considerable portion of the farms, concerning the productivity index. Such results agree with the current literature (Moro et al, 2005;Rodrigues et al, 2011); however, the influence of the rearing conditions and health status might not be neglected (Lee et al, 2012;Bhadauria et al, 2017;De Jong and Van Riel, 2020).…”

“…According to data mining methodology, the analysis was divided into five distinct phases: 1) Understanding the domain of knowledge to which the study refers; 2) Knowledge and understanding of the database for this domain; 3) Data preparation (cleaning, construction, selection, integration, and formatting); 4) Modeling; 5) Evaluation of results, allowing for reconsiderations and cyclical reassessments (Chapman et al, 2000). The trees' output format is characterized by a relatively fast construction process and straightforward interpretation of a final model (Lee et al, 2012). They are based on an 'If-Then' rules approach to learning from a set of independent observations.…”

Polymer Membranes for Enthalpy Exchangers

“…Lee et al [4] enhanced the diffusivity of paper by impregnating it with lithium chloride (LiCl). The reported values of the moisture diffusivity ranged from 1.8 × 10 −11 m 2 /s to 6.0 × 10 −11 m 2 /s and in another study, it was found to be 3.8 × 10 −11 m 2 /s [5].…”

“…The more hydrophilic a material, the higher the latent effectiveness that can be expected. Lee et al [5] investigated the influence of airflow, humidity, temperature, and fin properties on heat and latent effectiveness. The values of the fin efficiencies for heat transfer were between 0.11 and 0.13.…”

“…The moisture permeability of the fin is approaching zero due to the aluminum as the fin material. The fin efficiency for the moisture transfer is negligibly small even if the fin material is made from hydrophilic material [5].…”