Ambient water condensing apparatus

Abstract

An ambient water condensing apparatus that extracts water vapor from ambient air utilizing a thermoelectric device, a superhydrophobic and/or superhydrophilic radiating condensing surface and a heat sink for providing point of source irrigation or drinking water using conventional and/or sustainable energy supplies. The thermoelectric device is thermally coupled intermediate of the condensing surface and the heat sink, and in particular a cold side of the thermoelectric device is thermally connected to the condensing surface and a hot side of the thermoelectric device is thermally connected to the heat sink. The water condensing apparatus may also include at least one fan element that cools the heat sink and introduces additional air to the condensing surface. The thermoelectric device and the fan element may be powered by any suitable electrical energy source, such as by solar energy, wind energy or grid power.

Claims

1. An ambient water condensing apparatus, comprising: a thermoelectric device having a hot side and a cold side; a heat sink thermally connected to said hot side of said thermoelectric device; a water condensing surface thermally connected to said cold side of said thermoelectric device, said water condensing surface having a plurality of protruding finned surfaces wherein said finned surfaces of said water condensing surface include a superhydrophobic condensing surface.

2. The ambient water condensing apparatus as set forth in claim 1 wherein said heat sink includes a plurality of protruding finned surfaces.

3. The apparatus of claim 1 wherein said water condensing surface further comprises a series of nano-patterns.

4. The apparatus of claim 1 including a fan in fluid communication with said heat sink, said fan configured to induce a flow of air across said heat sink.

5. The apparatus of claim 4 wherein said fan is in fluid communication with said condensing surface, said fan configured to induce a flow of air across said condensing surface.

6. The apparatus of claim 1 wherein said water condensing surface further comprises a superhydrophilic condensing surface.

7. The apparatus of claim 1 wherein said thermoelectric device is powered by solar energy, wind energy, or electric grid power.

8. An ambient water condensing apparatus, comprising: a thermoelectric device having a hot side and a cold side; a porous heat sink thermally connected to said hot side of said thermoelectric device, said porous heat sink comprising a plurality of protruding finned surfaces and a plurality of air flow apertures; a porous superhydrophobic condensing surface thermally connected to said cold side of said thermoelectric device, said porous superhydrophobic condensing surface comprising a plurality of protruding finned surfaces and a plurality of air flow apertures; a porous insulating material surrounding said thermoelectric device, said porous insulating material positioned intermediate of said porous heat sink and said porous superhydrophobic condensing surface, said porous insulating material comprising a plurality of air flow apertures; and a fan in fluid communication with said porous heat sink and said porous superhydrophobic condensing surface, said fan configured to induce a flow of air across said porous heat sink and said porous superhydrophobic condensing surface, said fan configured to induce said flow of air through said air flow apertures of said porous heat sink, said porous insulating material and said porous superhydrophobic condensing surface; wherein said air flow apertures of said heat sink, said insulating material and said condensing surface are axially aligned.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a side plan view of an example of a water condensing apparatus in accordance with an illustrative embodiment of the invention disclosed herein;

(2) FIG. 2 is a top plan view of the water condensing apparatus shown in FIG. 1;

(3) FIG. 3 is an isometric view of an example of a water condensing apparatus in accordance with another illustrative embodiment of the invention disclosed herein;

(4) FIG. 4 is a top plan view of the exemplary water condensing apparatus shown in FIG. 3;

(5) FIG. 5 is an exploded perspective view of the exemplary water condensing apparatus shown in FIG. 3;

(6) FIG. 6 is an isometric view of an example of a water condensing apparatus in accordance with another illustrative embodiment of the invention disclosed herein;

(7) FIG. 7 is a top plan view of the exemplary water condensing apparatus shown in FIG. 6;

(8) FIG. 8 is an exploded perspective view of the exemplary water condensing apparatus shown in FIG. 6;

(9) FIG. 9 is an isometric view of an example of a water condensing apparatus in accordance with another illustrative embodiment of the invention disclosed herein;

(10) FIG. 10 is a top plan view of the exemplary water condensing apparatus shown in FIG. 9;

(11) FIG. 11 is an exploded perspective view of the exemplary water condensing apparatus shown in FIG. 9;

(12) FIG. 12 is an isometric view of an example of a water condensing apparatus in accordance with another illustrative embodiment of the invention disclosed herein;

(13) FIG. 13 is a top plan view of the exemplary water condensing apparatus shown in FIG. 12; and

(14) FIG. 14 is an exploded perspective view of the exemplary water condensing apparatus shown in FIG. 12.

DETAILED DESCRIPTION OF THE INVENTION

(15) The apparatuses and methods discussed herein are merely illustrative of specific manners in which to make and use this invention and are not to be interpreted as limiting in scope.

(16) While the invention has been described with a certain degree of particularity, it is to be noted that many modifications may be made in the construction and the arrangement of the structural and function details disclosed herein without departing from the scope of the invention. It is understood that the invention is not limited to the embodiments set forth herein for purposes of exemplification.

(17) The description of the invention is intended to be read in connection with the accompanying drawings, which are to be considered part of the entire written description of this invention. In the description, relative terms such as front, rear, lower, upper, horizontal, vertical, above, below, up, down, top and bottom as well as derivatives thereof (e.g., horizontally, downwardly, upwardly etc.) should be construed to refer to the orientation as then described or as shown in the drawings under discussion. These relative terms are for convenience of description and do not require that the machine be constructed or the method to be operated in a particular orientation. Terms, such as connected, connecting, attached, attaching, join and joining are used interchangeably and refer to one structure or surface being secured to another structure or surface or integrally fabricated in one piece.

(18) Referring to the figures of the drawings, wherein like numerals of reference designate like elements throughout the several views, and initially to FIGS. 1 and 2, an ambient water condensing apparatus 10 that extracts water vapor from ambient air. The apparatus 10 includes a Peltier thermoelectric device 12 having a cold side 14 that is thermally connected to a condensing surface 18. A hot side 16 of the thermoelectric device 12 is thermally connected to a heat sink 20 and cooled by the atmospheric air. The thermoelectric device 12 may be powered by any suitable electrical energy source, such as by solar energy, wind energy or grid power.

(19) In the exemplary embodiment of the water condensing apparatus 10 illustrated FIGS. 1 and 2, the condensing surface 18 includes a superhydrophilic radiating condensing surface 18A and a superhydrophobic radiating condensing surface 18B. The condensing surface 18 may be covered with a highly conductive metallic base material 22, such as a metal, metal alloy, electrolyte, superconductor, semiconductor, plasma, graphite or conductive polymer. The base material 22 may be coated with an oxide, polymeric, ceramic, mineral or metallic material to form a series of nano-patterns 24 on the condensing surface 18. While the nano-patterns 24 are illustrated in FIG. 2 as alternating pattern of dots or circular areas, the water condensing apparatus 10 is not so limited and it will be appreciated that other forms of nano-patterns may be employed, such as channels or pits.

(20) The superhydrophilic radiating condensing surface 18A enhances the ability of the water condensing apparatus 10 to capture water from the ambient air while also enhancing the solar reflectance. Additionally, the superhydrophobic radiating surface 18B enhances drainage of the condensed water from the condensing surface 18, while also providing the radiative cooling benefit. The use of a superhydrophilic coating on the condensing surface 18 results in increased condensate formation but limits condensate drainage and heat transfer effectiveness, but when nano-patterns 24 are designed with surrounding superhydrophobic surfaces the effective heat transfer and condensate drainage are increased. The superhydrophobic coating for the superhydrophobic radiating surface 18B may be prepared according to known methods for making superhydrophobic materials, such as forming flat surface arrays of vertically aligned PTFE coated carbon nanotubes, forming periodic arrays of pillars on a flat surface using microelectronics-based photolithography, using self-aligned polymer nanospheres, or using porous or roughened fluorinated polymers as a superhydrophobic coating material.

(21) As exemplified in FIG. 1, the water condensing apparatus 10 is configured at an acute angle A to the ground. By way of a non-limiting example, the water condensing apparatus 10 may be positioned at angle A between 40 and 60 degrees relative to the ground. In addition, during operation, the condensing surface 18 may be positioned facing away from direct sunlight during the daytime in order to minimize heating while, at the same time, facing the sky during the nighttime in order to promote radiative cooling of the water condensing apparatus 10.

(22) Turning now to FIGS. 3 through 5, the water condensing apparatus 10 is exemplified with the heat sink 20 having one or more fin-like surfaces 26 for enhanced heat mass transfer. The heat sink 20 is left exposed to the open air, enabling the heat sink 20 to be cooled by a convectively induced air flow. Similar to above, the hot side 16 of the thermoelectric device 12 is thermally connected to the heat sink 20, while the cold side 14 of the thermoelectric device 12 is thermally connected to the condensing surface 18. In this exemplary embodiment of the invention, the thermoelectric device 12 is surrounded by and may be seated within an aperture 32 of a layer of insulating material 28 to prevent reverse heat flow from the heat sink 20 to the condensing surface 18. The insulating material 28 may be constructed of polystyrene, polyisocyanurate, or polyurethane. Power is provided to the thermoelectric device 12 from solar panels, wind energy or grid power. The condensing surface 18 may include a superhydrophilic radiating condensing surface 18A, a superhydrophobic radiating condensing surface 18B or a combination of both. The condensing surface 18 includes one or more fin-like surfaces 30, which are left exposed to the open air, allowing the condensing surface 18 to contact ambient air and condense the water vapor present.

(23) FIGS. 6 through 8 show yet another embodiment of the ambient water condensing apparatus 10 provided herein. In this illustrative embodiment, a fan element 34 is in fluid communication with the heat sink 20 and a heat sink cover 36 directs the flow of air induced by the fan element 34 directly across the heat sink 20. An air flow chamber 38 is formed intermediate of the heat sink cover 36 and the fin-like surfaces 30 of the heat sink 20 in order to cool the heat sink 20 by forced convection instead of natural convection induced by the heat sink 20. The increased flow of air increases the heat transfer out of the heat sink 20, lowers the temperature of the heat sink 20, and therefore increases the efficiency of the thermoelectric device 12. The heat sink cover 36 leaves only the top and bottom of the heat sink 20 exposed to the open air, allowing for the fan element 34 to force air through the fin-like surfaces 30 that protrude from the heat sink 20.

(24) FIGS. 9 through 11 illustrate the ambient water condensing apparatus 10 with a condensing surface plate 40 attached to and covering the condensing surface 18 and a heat sink plate 42 attached to and covering the heat sink 20. In this embodiment, the condensing surface plate 40 and the heat sink plate 42 leave the bottom of the condensing surface 18 and the heat sink 20 exposed to the open air. The top of the condensing surface 18 and the heat sink 20 are in fluid communication with the fan element 34, which is positioned within a fan element housing 44 that is connected to the top of the condensing surface plate 40 and the heat sink plate 42. The condensing surface plate 40, the heat sink plate 42, and the fan element 34 induces an air flow across both the heat sink 20 and the condensing surface 18. The fan element 34 both cools the heat sink 20 and introduces additional air to the condensing surface 18, increasing the vapor exposure, therefore increasing the condensate flow rate of the water condensing apparatus 10.

(25) Turning now to FIGS. 12 through 14, in this non-limiting embodiment of the water condensing apparatus 10, the heat sink cover 36 completely covers the heat sink 20, such as by using a top cap 46 and a bottom cap 48, encloses the air flow chamber 38 unlike the embodiment illustrated in FIGS. 6 through 8. The heat sink 20, the insulation layer 28, and the condensing surface 18 have axially aligned apertures 50, 52 and 54. The apertures 50 of the heat sink 20 and the apertures 54 of the condensing surface 18 are positioned in between the fin-like structures 26 and 30, respectively. The fan element 34 is attached to the heat sink cover 36 and pulls air from the condensing surface 18, through the apertures 54 of the condensing surface 18, through the apertures 52 in the insulating material 28, and through the apertures 54 in the heat sink 20. This configuration of the ambient water condensing apparatus 10 enables the cool, dry air coming off of the condensing surface 18 to pass over and through the heat sink 20, increasing the temperature difference between the heat sink 20 and the air passing over it, therefore increasing the heat transfer from the heat sink 20.

(26) Whereas, the apparatuses and methods have been described in relation to the drawings and claims, it should be understood that other and further modifications, apart from those shown or suggested herein, may be made within the spirit and scope of this invention.