Working conditions of Total heat exchange membrane:
1. Exchange medium: gas-liquid, gas-gas.
2. Exchange method:
Total heat exchange type, cold energy recovery, heat energy recovery, humidity regulation.
Latent heat exchange type, moisture permeability. Humidity regulation.
Sensible heat exchange type, cold/heat energy recovery. Energy saving and consumption reduction.
Types of total heat exchange membrane:
1. Non-Porous total heat exchange membrane
Sensible heat exchange: based on the temperature difference on both sides , the thermal conductivity of the membrane, contact conduction exchange by membrane body.
Latent heat exchange: based on the humidity difference on both sides , the water vapor pressure difference, permeation exchange by molecular gap (1nm) of the membrane.
Low exchange efficiency. High thermal conductivity requirements for the membrane material, as thin as possible.
2. Porous full heat exchange membrane,
Sensible heat exchange: based on the temperature and humidity difference on both sides of the membrane.
* Thermal conductivity of the membrane, contact conduction exchange by membrane body,
* The mediums direct contact by the pores and the channel, convection and radiation exchange.
* Water vapor on the high humidity side penetrates to the low temperature side for condensation and heat release exchange
* Liquid water on the high temperature side absorbs heat and evaporates into water vapor, and penetrates to the low pressure side for exchange.
Latent heat exchange: based on the humidity difference and temperature difference on both sides of the membrane.
* Water vapor on the high humidity side penetrates to the low temperature side for condensation and heat release exchange
* Liquid water on the high temperature side absorbs heat and evaporates into water vapor, and penetrates to the low pressure side for exchange.
Based on different pore sizes and porosities, the exchange efficiency is 2-4 times higher than that of the non-porous type.
The max pore size <100nm, the COVID and H3N2 bacteria cannot penetrate.
With the appropriate pore size and corresponding bubble point pressure, liquids cannot penetrate.
With the appropriate gas pressure difference, the gases on both sides will not mix and contaminate.
The exchange efficiency is high.The thermal conductivity and thickness of the membrane material are not required to be high.
Enhancement and change of membrane material and surface properties:
Hydrophilic modification: The moisture permeability can reach 5000-20000 g/m2*24h (20 degrees, RH65%)
Permeability selectivity: It has different permeability coefficients and priorities for O2, N2, CO2, and CO gases.
Antibacterial: The inhibition rate of Escherichia coli and Staphylococcus aureus is >90%,
Anti-mold: Level 0-1.
Cleanable: water, chemical cleaning and disinfection.
Assembly: thickness, rigidity, wrinkle, adhesive, welding.
Applications:
* Household and commercial air conditioning fresh air & exhaust exchange, recovery of cold energy or heat energy, humidity adjustment.
* Factory high and low temperature gas & circulating water exchange, recovery of cold energy or heat energy.
* Cold storage air circulation exchange, recovery of cold energy, humidity control.
