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Experimental investigation and performance evaluation of a mixed-flow air to air membrane enthalpy exchanger with different configurations

Journal Article


Abstract


  • © 2019 Elsevier Ltd This paper presents an experimental investigation and performance evaluation of a mixed-flow air to air membrane enthalpy exchanger with different flow configurations. The moisture diffusivity, water contact angle and elastic modulus of five porous membranes were first experimentally determined using a wet cup test method, a contact angle meter and the tensile test, respectively. The five porous membranes investigated consisted of two Polyvinylidene difluoride membranes with the mean pore diameters of 0.22 µm (PVDF22) and 0.45 µm (PVDF45) respectively, two Nylon membranes with 0.1 µm and 0.45 µm pore sizes respectively and one Polyethersulfone (PES) membrane with a 0.1 µm pore size. The optimal membrane was then identified and used to fabricate an enthalpy exchanger. Lastly, the performance of the enthalpy exchanger with different mixed-flow configurations was experimentally investigated. The results showed that the PVDF45 membrane offered the highest moisture diffusivity (1.91 × 10−6 ± 2.42 × 10−8 m2/s) with hydrophilic surface and a relatively high elastic modulus (4.97 × 108 ± 3.86 × 107 Pa). It was shown that the enthalpy exchanger with Z-shape flow of the supply air stream and И-shape flow of the exhaust air stream at an entrance ratio of 0.25 offered the best thermal performance as the sensible, latent and total effectiveness increased by 12.3%, 15.1% and 14.6% respectively, when the flow rate was 0.3 l/s, as compared to that of the pure cross flow. The same flow configuration was able to recover the highest energy among all configurations investigated.

Publication Date


  • 2020

Citation


  • Al-Bdoor, A., Ma, Z. & Cooper, P. (2020). Experimental investigation and performance evaluation of a mixed-flow air to air membrane enthalpy exchanger with different configurations. Applied Thermal Engineering, 166 114682-1-114682.

Scopus Eid


  • 2-s2.0-85075943176

Start Page


  • 114682-1

End Page


  • 114682

Volume


  • 166

Place Of Publication


  • United Kingdom

Abstract


  • © 2019 Elsevier Ltd This paper presents an experimental investigation and performance evaluation of a mixed-flow air to air membrane enthalpy exchanger with different flow configurations. The moisture diffusivity, water contact angle and elastic modulus of five porous membranes were first experimentally determined using a wet cup test method, a contact angle meter and the tensile test, respectively. The five porous membranes investigated consisted of two Polyvinylidene difluoride membranes with the mean pore diameters of 0.22 µm (PVDF22) and 0.45 µm (PVDF45) respectively, two Nylon membranes with 0.1 µm and 0.45 µm pore sizes respectively and one Polyethersulfone (PES) membrane with a 0.1 µm pore size. The optimal membrane was then identified and used to fabricate an enthalpy exchanger. Lastly, the performance of the enthalpy exchanger with different mixed-flow configurations was experimentally investigated. The results showed that the PVDF45 membrane offered the highest moisture diffusivity (1.91 × 10−6 ± 2.42 × 10−8 m2/s) with hydrophilic surface and a relatively high elastic modulus (4.97 × 108 ± 3.86 × 107 Pa). It was shown that the enthalpy exchanger with Z-shape flow of the supply air stream and И-shape flow of the exhaust air stream at an entrance ratio of 0.25 offered the best thermal performance as the sensible, latent and total effectiveness increased by 12.3%, 15.1% and 14.6% respectively, when the flow rate was 0.3 l/s, as compared to that of the pure cross flow. The same flow configuration was able to recover the highest energy among all configurations investigated.

Publication Date


  • 2020

Citation


  • Al-Bdoor, A., Ma, Z. & Cooper, P. (2020). Experimental investigation and performance evaluation of a mixed-flow air to air membrane enthalpy exchanger with different configurations. Applied Thermal Engineering, 166 114682-1-114682.

Scopus Eid


  • 2-s2.0-85075943176

Start Page


  • 114682-1

End Page


  • 114682

Volume


  • 166

Place Of Publication


  • United Kingdom