Latent energy transfer laminate for plate pack core
Various aspects of the present disclosure are directed toward apparatuses, systems and methods that include an airflow conditioning device. The airflow conditioning device includes a channels defining airflow pathways through the airflow conditioning device. A heat and moisture exchanger is disposed in the airflow conditioning device with a plurality of air-permeable barriers separating the airflow pathways. The airflow conditioning device includes air-permeable barriers with a layer of a microporous film and a water vapor permeable resin layer adjoined to one or both of the surfaces of the microporous film as either a continuous microporous coating or a discontinuous coating.
1. An airflow conditioning device comprising:
a first channel defining a first airflow pathway through the airflow conditioning device and a second channel defining a second airflow pathway through the airflow conditioning device;
a heat and moisture exchanger disposed in the airflow conditioning device, the first and second channels each passing through the heat and moisture exchanger, the heat and moisture exchanger comprising a plurality of air-permeable barriers separating the first airflow pathway from the second airflow pathway, at least one of the plurality of air-permeable barriers comprising:
a layer of a microporous film comprising a first surface and a second surface opposite of the first surface, and
a water vapor permeable resin layer adjoined to the first surface, the second surface, or both the first and second surfaces of the microporous film so as to form a discontinuous nonporous coating thereon.
2. The airflow conditioning device of claim 1 , wherein the microporous film includes expanded polytetrafluoroethylene (ePTFE), expanded Polyethylene (ePE), or a combination thereof.
3. The airflow conditioning device of claim 1 , wherein the water vapor permeable resin layer includes polyurethane.
4. The airflow conditioning device of claim 1 , wherein the microporous film is adjoined to a mesh.
5. The airflow conditioning device of claim 1 , wherein the microporous film is heat laminated to an extruded mesh component.
6. The airflow conditioning device of claim 1 , wherein the microporous film is a component of a nonwoven fabric.
7. The airflow conditioning device of claim 1 , wherein the microporous film is dot laminated to a nonwoven fabric.
8. The airflow conditioning device of claim 1 , further comprising:
a boundary layer defined by a surface of the at least one of the plurality of air-permeable barriers, and
at least one spacer arranged at or adjacent to the surface of the at least one of the plurality of air-permeable barriers to disrupt a portion of the boundary layer.
9. The airflow conditioning device of claim 8 , wherein the disrupted portion of the boundary layer includes a reduced-thickness region of the boundary layer in which heat or water vapor transfer through the at least one of the air-permeable barriers is enhanced with respect to an undisrupted portion of the boundary layer.
10. The airflow conditioning device of claim 1 , wherein the layer of microporous film includes a porosity of no greater than 90%.
11. The airflow conditioning device of claim 1 , wherein the at least one of the plurality of air-permeable barriers includes a latent efficiency of at least 70% at a Re value of inclusively between 50 and 85.
12. The airflow conditioning device of claim 1 , wherein the at least one of the plurality of barriers has an air permeability of inclusively between 300 and 5000 Gurley seconds.
13. The airflow conditioning device of claim 1 , wherein the discontinuous coating is applied in a substantially uniform distribution on the first surface, the second surface, or both the first and second surfaces.
14. The airflow conditioning device of claim 13 , wherein the discontinuous coating is applied in a pattern on the first surface, the second surface, or both the first and second surfaces.
15. A method of conditioning an airflow passing through an airflow conditioning device, the method comprising:
directing a first airflow through a first airflow pathway through the airflow conditioning device and directing a second airflow through a second airflow pathway through the airflow conditioning device;
directing both the first and second airflows through a heat and moisture exchanger disposed within the airflow conditioning device, the heat and moisture exchanger comprising a plurality of air-permeable barriers separating the first airflow from the second airflow; and
conditioning the second airflow by transferring thermal energy and humidity from the first airflow to the second airflow through at least one of the plurality of air-permeable barriers,
wherein the at least one of the plurality of air-permeable barriers includes a layer of a microporous film and a water vapor permeable resin layer adjoined to a first surface of the microporous film, a second surface of the microporous film opposite from the first surface, or both the first and second surfaces of the microporous film so as to form a discontinuous nonporous coating thereon.
16. The method of claim 15 , wherein the layer of microporous film includes expanded polytetrafluoroethylene (ePTFE), expanded polyethylene (ePE), or a combination thereof.
17. A system comprising:
a first channel defining a first airflow pathway through the airflow conditioning device and a second channel defining a second airflow pathway through the airflow conditioning device; and
a heat and moisture exchanger disposed within the airflow conditioning device, the heat and moisture exchanger comprising a plurality of air-permeable barriers separating the first airflow pathway from the second airflow pathway, at least one of the plurality of air-permeable barriers comprising a layer of a microporous film having a first surface and a second surface opposite of the first surface, and a water vapor permeable resin layer adjoined to the first surface, the second surface, or both the first and second surfaces of the microporous film so as to form a coating thereon defining a first surface region that is microporous and a second surface region that is nonporous, such that the first and second surface regions are disposed adjacent to each other.
18. The system of claim 17 , wherein the layer of microporous film includes expanded polytetrafluoroethylene (ePTFE), expanded polyethylene (ePE), or a combination thereof.