Cove heater radiator apparatus and method
An embodiment of the heater has a radiant panel, a heating element, a thermal dispersion gap, and an integral wire chase. A method of heating includes heating a radiant panel, having a thermal dispersion gap, with a heating element, and then directing the radiant heat emitted from the radiant panel towards an object.
The present invention relates generally to heaters. More particularly, the present invention relates to a radiant cove heater.
BACKGROUND OF THE INVENTIONHeaters are used in homes, commercial settings, industrial settings, and outdoors to heat living spaces, office spaces, working spaces, objects, substances, people, and other living organisms. Heating can be accomplished through several different means: conduction, convection, and radiation. For example, a hot plate heats an object primarily through conduction, whereas a gas furnace heats an object primarily through convection and conduction. Some heaters, on the other hand, heat objects substantially through radiation.
A cove heater operates by emitting radiant heat from a heated panel. This radiant heat passes through air with little attenuation and is directly absorbed by occupants in the room, as well as the furniture, carpet, walls, and other structures in the path of the radiant energy emitted by the heater. As these objects become warmer, they heat the surrounding air through the process of conduction and convection. Because objects and people are heated directly by the radiant cove heater, the cove heater is able to provide a similar comfort level as a conventional convective heater while maintaining a relatively cool air temperature.
Traditionally, many cove heaters are constructed with a back heater enclosure and a front panel that serves as a radiant surface. The back heater enclosure functions to provide a structure for attaching the heater to a surface such as a wall. The back heater enclosure also functions to provide mechanical support and an enclosure for a crossover wire chase that allows the heater to be wired from either end. Finally, the back heater enclosure sometimes provides part of the electrical enclosure for a wiring junction box. Although the back heater enclosure provides important functions, it can add substantially to the cost, size, and weight of a cove heater.
One problem related to some back enclosures is a banging noise caused by the different rate of expansion of the front panel and back enclosure. Because the front panel at times is much hotter than the back enclosure, it can tend to expand more than the back enclosure, which can result in a bowed-out front panel. When the heating cycle is shut off and the heater cooled, the front panel can sometimes snap back into shape to relieve the stress, causing a loud banging noise.
Another problem suffered by some traditional cove heaters is the uneven heating of the radiant surface by a heating element. The heating element produces a hot band on the radiant surface that is a result of conduction of most of the heat generated by the heating element to the parts of the radiant surface closest to the heating element. Because of the hot spot, an expensive, heat-stable finish is often used. Furthermore, because the temperature profile across the radiant surface is not uniform, different parts of the radiant surface undergo different amounts of thermal expansion, which can cause degradation of the surface finish.
Another problem with some existing heaters is that some of the heat energy generated by the heating element goes to heating the air behind the front panel via convection.
Accordingly, it is desirable to provide an apparatus that does not need a back enclosure, evenly heats the radiant surface, has a higher radiant heating performance and a lower convective heat loss.
SUMMARY OF THE INVENTIONThe foregoing needs are met, to a great extent, by the present invention, wherein one aspect an apparatus is provided that in some embodiments evenly heats the radiant surface, has a higher radiant heating performance and lower convective heat loss.
In accordance with one embodiment of the present invention, a heater is provided. The heater has a radiant panel, a heating element attached to the radiant panel, and a thermal dispersion gap in between the heating element and the front surface of the radiant panel. In some embodiments of the invention, the heater also has a wire chase that is integrated into the radiant panel.
In accordance with another embodiment of the present invention, a heater is provided. The heater has a radiant panel, a heating element attached to the radiant panel, and a wire chase integrated into the radiant panel.
In accordance with another embodiment of the present invention, a method of heating is provided. The method includes dispersing the heat generated by the heating element around a gap and across the surface of the radiant panel, and radiating the heat from the surface of the radiant panel.
In accordance with another embodiment of the present invention, a method of heating is provided. The method includes heating a radiant panel with a heating element, running power through a wire located in an integrated wire chase in the radiant panel, and radiating the heat from the surface of the radiant panel.
In accordance with another embodiment of the present invention, a heater is provided. The heater includes a radiant panel, a means for heating the radiant panel, and a means for distributing heat across the radiant panel.
There has thus been outlined, rather broadly, certain embodiments of the invention in order that the detailed description thereof herein may be better understood, and in order that the present contribution to the art may be better appreciated. There are, of course, additional embodiments of the invention that will be described below and which will form the subject matter of the claims appended hereto.
In this respect, before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of embodiments in addition to those described and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein, as well as the abstract, are for the purpose of description and should not be regarded as limiting.
As such, those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the claims be regarded as including such equivalent constructions insofar as they do not depart from the spirit and scope of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described with reference to the drawing figures, in which like reference numerals refer to like parts throughout. An embodiment in accordance with the present invention, shown in
An embodiment of the present invention is illustrated in
In some embodiments of the invention, the radiant panel 16 is made of extruded aluminum, but the radiant panel 14 can also be constructed out of a different metal such as steel or any other suitable material. The heating element 20 converts electricity into heat energy. The heat energy is then conducted from the heating element 20 through the body of the radiant panel 16 to the radiant surface 18, where the heat energy warms a powder coating that is effective at radiating heat energy in the form of infrared radiation. The radiant surface 18 is coated with the powder coating to enhance its heat radiating efficiency. The powder coating is heat stable, radiates heat energy efficiently, has in some embodiments an emissivity greater than 0.9, has a crystalline additive that gives the finish a rough surface that increases the surface area available to radiate heat, and provides an aesthetic finish. Other finishes with similar properties, such as a vitreous enamel, a heat stable paint, or another suitable finish, are also acceptable.
The radiant heat energy emitted from the cove heater 10 (see
Returning to
Another feature built into the radiant panel 16 is the thermal dispersion gap 14 that is positioned between the heating element 20 and the radiant surface 18. The thermal dispersion gap 14, rectangular in shape with rounded edges, is an air-filled gap that functions to distribute heat energy across the radiant surface 18. Although the thermal dispersion gap 14 is rectangular in shape in some embodiments of the invention, the thermal dispersion gap 14 can be constructed in other suitable shapes, such as triangular, oval, or irregular shaped, for example. Furthermore, the thermal dispersion gap 14 can be filled with an insulating material in other embodiments of the invention. Without the thermal dispersion gap 14, a large portion of the heat energy is conducted from the heating element 20 to the portion of the radiant surface 18 closest to the heating element 20, resulting in a hot band along the length of the radiant surface 18. With the thermal dispersion gap 14, the path of the heat energy is diverted around the shortest path to the radiant surface 18 to adjacent portions of the radiant surface 18. Thus, the heat energy is distributed across the radiant surface 18, reducing the hot band. This results in a relatively lower peak temperature on the radiant surface 18, which allows the use of low cost and relatively low temperature rated radiant surface 18 finishes. Furthermore, the thermal dispersion gap 14 helps reduce degradation of the radiant surface 18 finish from the cyclic thermal expansion and contraction of the heated portions of the radiant panel 16 because the temperature variation across the radiant surface 18 is relatively less extreme.
The hooked flap 48 and the wire chase 12 of the radiant panel 16 have a secondary function, which is to hold the thermal barrier 46 in place over the back surface 40 of the radiant panel 16. The thermal barrier 46 functions to reduce heat loss through the back surface 40 of the radiant panel 16. Reducing heat lost through the back surface 40 results in more energy being radiated from the front radiant surface 18. The thermal barrier 46 is made of a heat-resistant, thermal-insulating material, such as a ceramic fiber, fiberglass, plastic, paper-based product such as a cardboard-like material, or any other suitable material.
At the top and bottom ends of the radiant panel 16 are the hooked flap 48 and wire chase 12 enclosure, respectively. Both the hooked flap 48 and wire chase 12 enclosure function to attach the radiant panel 16 to junction boxes 22 (see
The radiant panel 16 has a channel 50 (see
Suitable heating elements 20 may be obtained from various manufacturers, including Chromalox, Inc. located in Pittsburgh, Pa., and Watlow Electric Manufacturing Co. located in St. Louis, Mo.
Wiring can be threaded through either of two knockout holes 66 and 68 of the junction box 22. The hole 66 on the rear portion of the junction box 22 (see
Additional features on the junction box 22 include two screw tracks 72 and 74 that are used to fasten an end cap to the cove heater 10 (see
The two holes 94 and 96 on the mounting plate 28 are raised from the base of the mounting plate 26 by two projections 95 and 97. The projections 95 and 97 fit through the holes 90 and 92 in the mounting bracket 26. When the screws 30 and 32 are fully threaded into the holes 94 and 96, the heads of the screws 30 and 32 rest against the top of the projections 95 and 97. Because the mounting bracket 26 is thinner than the length of the projections 95 and 97, the mounting bracket can rock back and forth and translate along the projections 95 and 97 between the head of the screws 30 and 32 and the mounting plate 28. This rocking action accommodates the lateral thermal expansion of the cove heater 10 during heating cycles, and it reduces the likelihood that noise will be generated during the thermal expansion of the cove heater 10. Alternatively, in other embodiments of the invention, a modified screw can be used in place of the projections 95 and 97. The modified screw has threading only on part of the screw body. The portion of the screw body adjacent to the screw head would be unthreaded. In this case, the mounting bracket 26 rocks laterally along the unthreaded part of the screw body.
The radiant panel of
Another embodiment of a mounting bracket 104 is shown in
The mounting plate 106 shown in
Longer heaters 10, for example heaters 10 greater than six feet in length, can be additionally supported by an intermediate bracket 128 shown in
As shown in
Although screws are used in an embodiment of the invention, bolts, rivets, welding, adhesives, and other suitable fastening materials and devices can be used. Furthermore, although specific materials, such as aluminum, are used in the construction of an embodiment of the invention, other materials such as steel, copper, or another suitable construction material can be used.
Although an example of the cove heater 10 (see
The many features and advantages of the invention are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the invention which fall within the true spirit and scope of the invention. Further, since numerous modifications and variations will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.
Claims
1. A heater, comprising:
- a radiant panel;
- a heating element attached to the radiant panel; and
- a thermal dispersion gap in between the heating element and the front surface of the radiant panel.
2. The heater of claim 1, wherein the heating element is located in a channel defined by the radiant panel.
3. The heater of claim 1, further comprising a thermal barrier covering the rear surface of the radiant panel.
4. The heater of claim 1, further comprising a wire chase integrated into the radiant panel.
5. The heater of claim 4, wherein the wire chase is an enclosure defined by the back surface of the radiant panel and a hook-shaped flap.
6. The heater of claim 1, further comprising a radiant coating on the front surface of the radiant panel.
7. The heater of claim 6, wherein the coating is comprised of one of the following: a vitreous enamel or a powder coating.
8. The heater of claim 1, wherein the thermal dispersion gap is generally rectangular in shape with rounded edges.
9. The heater of claim 1, further comprising a junction box with bracket holes and mounting rails for mounting the radiant panel on the junction box.
10. The heater of claim 1, further comprising a capturing tab located on the back of the radiant panel.
11. The heater of claim 1, further comprising at least one groove on the surface of the radiant panel that defines a channel for the heating element, for facilitating the staking of the heating element into the channel.
12. The heater of claim 1, wherein the thermal dispersion gap is defined by an interior surface of the radiant panel.
13. The heater of claim 1, further comprising a bracket assembly configured to accommodate the lateral expansion of the cove heater.
14. The heater of claim 13, wherein the bracket assembly comprises:
- a bracket with at least one hole; and
- a mounting plate with at least one projection, wherein the projection fits through the hole in the bracket and is configured to allow the bracket to translate along the projection.
15. The heater of claim 13, wherein the bracket assembly comprises:
- a mounting plate with a slot; and
- a bracket with a projection configured to fit through the slot in the mounting plate.
16. The heater of claim 1, further comprising an intermediate bracket configured to provide support to the heater, wherein the intermediate bracket comprises:
- a base portion with at least one hole;
- an upper arm extending from the base, and
- a lower arm extending from the base.
17. A heater, comprising:
- a radiant panel;
- a heating element attached to the radiant panel; and
- a wire chase integrated into the radiant panel.
18. The heater of claim 17, wherein the heating element is located in a channel defined by the radiant panel.
19. The heater of claim 17, further comprising a thermal barrier covering the rear surface of the radiant panel.
20. The heater of claim 17, further comprising a radiant coating on the front surface of the radiant panel.
21. A method of heating comprising:
- dispersing the heat generated by the heating element around a gap and across the surface of the radiant panel; and
- radiating the heat from the surface of the radiant panel.
22. The method of claim 21, further comprising running power through a wire located in an integrated wire chase in the radiant panel.
23. The method of claim 21, further comprising reducing heat loss through the rear surface of the radiant panel with a thermal barrier.
24. The method of claim 21, further comprising emitting radiant heat from a coating on the front surface of the radiant panel.
25. The method of claim 21, further comprising mounting the radiant panel to a wall by fastening the radiant panel to a junction box with bracket holes and mounting rails.
26. A method of heating comprising:
- heating a radiant panel with a heating element;
- running power through a wire located in an integrated wire chase in the radiant panel; and
- radiating the heat from the surface of the radiant panel.
27. The method of claim 26, further comprising reducing heat loss through the rear surface of the radiant panel with a thermal barrier.
28. The method of claim 26, further comprising emitting radiant heat from a coating on the front surface of the radiant panel.
29. A heater comprising:
- a radiant panel;
- a means for heating the radiant panel; and
- a means for distributing heat across the radiant panel.
30. The heater of claim 29, further comprising a means for integrating a wire crossover into the radiant panel.
31. The heater of claim 29, further comprising a means for reducing the heat loss from the back side of the radiant panel.
32. The heater of claim 29, further comprising a means for increasing the radiant heat emission from the radiant panel.
33. The heater of claim 29, further comprising a means for mounting the radiant panel to a wall.
Type: Application
Filed: Nov 22, 2004
Publication Date: May 25, 2006
Inventors: Carl Hinesley (Pinehurst, NC), David Grossenheider (Florence, SC)
Application Number: 10/993,362
International Classification: F24C 3/04 (20060101);