General heat exchanger : plate exchanger

• Heat and moisture exchange in a plate
• Apply materials that allows the moisture to pass,
  but not as much gas - a high compression paper
• Although the thermal conductivity of the material is low,
  the thickness is less than 0.1 mm, so the heat transfer resistance is negligible
• On the other hand, since the water molecules must pass through the material, the mass transfer resistance is much larger than the heat transfer resistance
• Latent heat transfer is less efficient than sensible heat transfer
• The temperature effectiveness of the heat recovery ventilation system using the plate heat exchanger is 60 ~ 80%, while the humidity effectiveness is only 20 ~ 30%
  (Hwataik Han, Youn-bok Choo, 2008, A Study on Heat Transfer Characteristics and Uncertainty of Heat Recovery Ventilator for Various Outdoor Temperature/Humidity Conditions, Korea Journal of Air-Conditioning and Refrigeration Engineering, Vol.20, pp. 608-613)
• When there is a lot of humidity difference between indoor and outdoor atmosphere, issued that occur are excess condensation in the heat exchanger, deterioration of performance due to corrosion ordeformation, mold generation, and more.

Problem case