JP2008101899A - Gas heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas heater having an attractive appearance, retaining cleanliness to improve overall efficiency of a reflection surface, covering a very hot exposed surface, and not adversely affected by strong wind. <P>SOLUTION: A radiant gas heater includes a gas inlet 1, for receiving gas from a gas supply; one or more air inlets; a gas burner in which gas from the gas inlet is burned using oxygen admitted through the one or more air inlets; one or more heat emitting elements which emit infrared radiation using energy generated by the gas burner; a reflector which directs infrared radiation from the heat emitting element; a housing 3 which accommodates the gas burner, heat emitting elements and reflector; and a glass cover 7 which covers the housing, positioned such that the infrared radiation is directed by the reflector through the glass cover. The air inlets allow both entry of air to the housing and exit of waste gases from the housing. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a gas heater. The present invention relates specifically, but not exclusively, to gas heaters installed in enclosures with protective covers to improve performance, safety and visual appeal.

  A normal radiant gas heater radiates infrared rays. In a typical apparatus, the radiant gas heater includes a plurality of gas burners, a manifold and injector assembly, and a reflector. The gas enters the heater through a gas control valve and is fired into the gas burner and through the manifold into the injector assembly where the gas is mixed with oxygen and burned. This causes heat to be released in the form of infrared rays, so that the infrared rays are directed in a desired direction, usually downward, by a reflector. When infrared rays strike a person or object, energy is absorbed as heat.

  In confined spaces such as rooms, convective air heating systems are often used instead of radiant heating systems. A convection air heating system heats air and then directs warm air to all parts of the room to create a warm environment. Convection air heating systems are effective in environments that can be effectively isolated from outside airflow, but are outdoors, have high airflow rate changes, doors are opened regularly, or the volume of air is enormous. Convection air heating systems are less effective in buildings where heating all of them is inefficient.

In such an environment, radiant heat is more effective. This is because radiant heat can be directed to heat the exact location where heating is required. Radiant heat works faster than convection air heating. This is because radiant heat primarily heats the body without heating the surrounding air. If the radiant heater is properly guided, people or groups of objects can keep warm without warming more than a small amount of ambient air. Thus, radiant heaters can be effective even in field installations exposed to cold winds.

  Despite these advantages, radiant gas heaters have several drawbacks. One drawback is that radiant gas heaters are usually unattractive in appearance. Another drawback is that particles and materials carried by the air can become molten on the manifold and the injection assembly or another part of the reflector or heater, which makes it difficult to keep the heater clean and subsequently the entire reflective surface. Loss of efficiency. Another drawback is that radiant heaters typically have a very hot exposed surface. A further disadvantage is that the radiant gas heater is adversely affected by strong winds.

  According to a first aspect of the present invention, one or more gas inlets for receiving gas from a gas supply source; one or more air inlets; gas from the one or more gas inlets is the one or more. One or more gas burners that are combusted using oxygen entered through the air inlets; one or more heat radiating elements that emit infrared radiation using energy generated by the one or more gas burners; One or more reflectors for directing infrared radiation from the radiating element; covering the one or more gas burners, the heat radiating element and one or more reflectors, and the one or more housings; One or more glass covers positioned to be guided by the one or more reflectors, wherein the air inlet allows air to flow into and out of the housing. To radiation gas heater is provided.

  The one or more glass covers may be formed from any suitable material or materials. The one or more glass covers are preferably made of glass that can withstand high temperatures and substantially transmit infrared radiation.

  One type of glass that has been found suitable for use in glass covers is ceramic glass. This type of glass is substantially transparent to infrared radiation. This glass can also make visible light opaque.

  Advantageously, the use of a separation medium such as a glass cover provides greater heat distribution and more uniform heat spreading over the assigned vertical and horizontal planes. While the heater can have any suitable shape and configuration, the glass cover is preferably the only portion of the heater that is visible to the viewer when the heater is installed. This can result in a more pleasant aesthetic appearance.

  According to another aspect of the present invention, a housing comprising a left side, a right side, an upper side, a lower side, a back side and an open front; a gas inlet on the left side of the housing for receiving gas from a gas supply source; An air inlet located on the underside of the housing that allows inflow of air and escape of waste gas; and gas from the gas inlet burns using oxygen entered through the one or more air inlets; An air inlet located on the lower side in the housing; and one or more gas burners located in the housing that emit infrared radiation using energy generated by the one or more gas burners; A plurality of reflectors located within the housing for directing infrared radiation from the heat-radiating element in the direction of the open front of the housing; and one or more gas covers covering the open front of the housing Radiation gas heater is provided comprising; Sukaba.

  Embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the features of the illustrated embodiment do not replace the generality of the above description of the invention.

The radiant gas heater illustrated in FIG. 1 includes a gas inlet 1 for receiving gas from a gas source. The gas inlet 1 is shown in detail in FIG. A plurality of air inlets 2 are included under the housing 3 to allow air to enter and waste gas to escape. The housing 3 also includes a gas burner 4 in which gas from the gas inlet burns using oxygen in the air that has entered through the air inlet 2. Waste gas leaves the housing 3 through the same air inlet 2.
Although not illustrated, it is understood that one or more gas burners can cooperate with the radiant gas heater.

The radiant gas heater further includes a heat radiating element 5 (best shown in FIG. 4) that emits infrared radiation (ie, infrared) using the energy generated by the gas burner 4. The reflector 6 guides infrared rays from the heat radiating element in the outward direction away from the housing 3.
The housing 3 houses a gas burner 4, a heat radiating element and a reflector 6. In another embodiment, there may be one or more housings 3 such that one housing contains a gas burner and another housing contains a heat radiating element or the like. If there is one or more gas burners 4 used in a radiant gas heater, a further housing can be used.

  The radiant gas heater further includes a glass cover 7 that covers the housing 3. The glass cover 7 is positioned so that the infrared light generated by the radiant gas heater is guided by the glass cover 7. In another embodiment, there can be one or more glass covers 7, in particular with one or more gas burners 4 cooperating with the radiant gas heater.

  The glass cover 7 may be formed from any suitable material or materials. Preferably, it can be made of glass that can withstand high temperatures and substantially transmits infrared radiation.

  One type of glass that has been found suitable for use in glass covers is ceramic glass. This type of glass is substantially transparent to infrared radiation. This glass can also be opaque to visible light. The glass may be heat resistant glass or any suitable heat resistant glass.

  While the heater can have any suitable shape and configuration, the glass cover is preferably the only portion of the heater that is visible to the viewer when the heater is installed. This can result in a more pleasant aesthetic appearance. As best shown in FIG. 5, the glass cover 7 may be surrounded by a metal plate 8. The glass cover 7 hides the entire remainder of the radiant gas heater and provides a very aesthetically pleasing front than the uncovered heater illustrated in FIG.

  Another advantage of using the glass cover 7 is that of the reflector 6 or heater, which is a radiating element that would otherwise make it difficult to keep the heater clean and subsequently lose the overall efficiency of the reflective surface. To help wipe away air-borne particles and materials that can become melted onto another part. Another advantage of the glass cover 7 is that it reduces the risk of fire occurring when the combustible material is brought into contact with a part of the heater where accidental or deliberate combustion occurs. Another advantage is that the glass cover 7 hides the hottest surface of the radiant gas heater, thereby reducing the possibility of significant injury to inadvertent human or animal contact. A further advantage is that the glass cover 7 protects the heat-radiating element from the wind.

In practice, a radiant gas heater of the illustrated type is usually installed on a building wall with the direction of the emitted radiation being directed generally downward at a predetermined angle, or the radiation is directed downwards. Installed on the ceiling of the building. In any case, the glass cover 7 of the present invention substantially conceals the remainder of the radiant gas heater and provides the advantages described above. These heaters can be installed inside or outside the building. The heaters of the present invention can be found in buildings such as street cafes or restaurants with courtyards where the heaters effectively radiate heat to people and make the area more comfortable and invite people. It is particularly useful for external applications.
People do not need to gather around the heater to remain warm because the heat does not drop dramatically when a person moves away from the heater, as is common with existing heater models.
Heat is provided substantially uniformly throughout the location.

  With particular reference now to FIG. 2, the housing 3 of the illustrated embodiment comprises a left side 9, a right side 10, an upper side 11, a lower side 12, a back side 13, and an open front. The gas inlet 1 is located on the left side 9 of the housing 3. The air inlet 2 is located on the lower side 12 of the housing 3. The gas burner 4 and the heat radiating element are located in the housing 3. The reflector 6 is also installed in the housing 3 to guide the infrared radiation from the heat radiating element in the direction of the open front of the housing, and the glass cover 7 covers the open front of the housing 3, so that the infrared light passes through the cover. Led.

  The invention will be further described with reference to the following experimental results which do not limit the scope of the invention in any way.

  A further advantage of using a separation medium such as a glass cover is to provide greater heat distribution and more uniform spread of heat over the assigned vertical and horizontal planes.

  The use of a glass cover as a separation means in a radiant gas heater (burning gaseous fuels such as liquefied petroleum gas, natural gas or the like) provides greater heat distribution and is more uniform on the assigned vertical and horizontal planes Experiments were conducted to ensure that the heat spread out.

  The thermal characteristics of the radiant gas heater were compared with those of the radiant gas heater with the glass cover.

  In order to measure and compare the characteristics of the radiant gas heater, a field was set up to allow temperature measurement over a predetermined horizontal and vertical plane. This field consists of a paper strip which will be further described with reference to FIG. A thermal imaging camera was used to measure each radiant gas heater acting on the paper strip in the field.

The field dimensions were determined from the core heating area (as calculated) of a standard radiant gas heater. That is, it is suggested that the total reachable area of the 25 MJ radiant gas heater in the ideal state is 12 square meters. The core of this heated area was selected as the core test field area (about 3.75 square meters) to ensure consistent results.

The test field area was laid as illustrated in FIG. A plain white paper strip 50 was used as a radiation absorbing material because its radiation characteristics are very similar to those of the human body. The paper strip 50 was placed in front of the radiant gas heater 52 and arranged in four columns (A, B, C, D and E) and four rows (I, II, III, and IV).
These rows were spaced 1000 mm apart. The rows were spaced 500 mm apart. The paper strip 50 was in the same position for all tests and was held in place by the rope 4. The radiant gas heater 2 was arranged 500 mm away from the row I column A. Due to the shape of the heater 52, data was considered only from the paper strip 50 in the core test field area 51.

  As shown in FIG. 7, the paper strip 50 was secured in place by a rope 545, and the paper strip 50 was divided into several parts: an upper region 50a, an intermediate region 50b, and a lower region 50c. Each dimension of the paper strip 50 was approximately 2 meters long and 55 mm wide. The paper strip was divided into upper, middle and lower regions (50a, 50b, 50c) so that three measurements could be taken by a thermal imaging camera (not shown) on each paper strip 50. The lengths of the upper, middle and lower regions (50a, 50b, 50c) were 500 mm, 400 mm and 400 mm, respectively. The remaining 300 mm at the bottom of the paper strip 50 was not measured to avoid heat reflection from the floor.

  In recording data for the experiment, images were taken with a thermal imaging camera (not shown) on the upper, middle and lower areas (50a, 50b, 50c) of each paper strip 50. From this shooting, the graph was developed and extended. Specific results obtained from measurements of each region are: (a) length vs. maximum heat, (b) length vs. minimum heat, (c) temperature in upper part (50a) (not maximum or minimum) And (d) the temperature in the lower region (not up to the maximum or minimum).

  During the test, the ambient temperature was noted to obtain the temperature difference obtained by each of the radiant gas heaters 2 on each of the paper strips.

  The measurements made in each of the upper, middle and lower regions (50a, 50b, 50c) of each paper strip 50 were used to construct a heating plot for both the radiant gas heater and the radiant gas heater with the glass cover. . The results are given in FIGS.

  Along the columns A, B and C for various distances from the heater, the most appropriate lines were drawn for both the radiant gas heater 80 and the radiant gas heater 82 with the glass cover 82.

  As shown in FIGS. 8-14, the most suitable line for a radiant gas heater with a glass cover 82 consistently produces a more uniform heat spreading across the vertical height of the paper strip 50 of FIG. give. 8, 9, 10 (column A at distances of 0.5 m, 1 m, and 1.5 m) and FIGS. 11, 12, 13, and 14 (column B at distances of 1 m and 1.5 m) C) shows a lower maximum and a higher minimum temperature difference. Assuming that lower maximum and higher minimum temperature differences are shown across the difference plot, it implies more uniform heat across the vertical and horizontal heating field.

  From FIG. 8 to FIG. 14, the maximum temperature of the radiant gas heater provided with the glass cover 82 is far away from the maximum temperature of the radiant gas heater 80 (as the distance from the heater increases from 0.5 m to 1.5 m). It can be understood that it will not fall.

  As shown in FIG. 8 (0.5 m distance, ie, column A, which is quite close), the radiant gas heater 80 still has a very high maximum temperature (about 15%) when moving away from the heater. Presented, the radiant gas heater with the glass cover 82 actually exhibited a higher maximum value. As can be seen from FIGS. 9 to 14, the temperature drop of the radiant gas heater 80 is dramatic as the distance from the radiant gas heater increases. However, the temperature drop of the radiant gas heater with the glass cover 82 is not dramatic as the distance from the radiant gas heater increases. Furthermore, the slope of the curve over the vertical distance at each point improves as the distance increases. That is, the gradient for a radiant gas heater with a glass cover 82 is reduced, and thus thermal uniformity increases and begins to improve as the distance from the heater increases. This illustrates the improved heating efficiency and the percentage at which drops are reduced when heating a radiant gas heater with a glass cover. This also suggests more uniform heating and is again supported by FIGS. 11, 12, 13 and 14.

  Like the maximum temperature, the minimum temperature of FIGS. 8-12 again appears to show greater consistency for a radiant gas heater with a glass cover. FIGS. 8-12 show a consistently higher minimum temperature on the radiant gas heater with the glass cover 82 when compared to the radiant gas heater 80, which again provides more uniform heat over the heat field. Further suggestion.

  The result of this experiment was that a radiant gas heater with a glass cover (burning gas fuel-liquefied petroleum gas, natural gas or the like), with a separation medium (such as glass), was assigned a greater heat spread and Provides more uniform heat spread over a vertical and horizontal plane.

  It should be understood that various changes, additions and / or modifications can be made to the components described above without departing from the spirit or scope of the present invention.

It is a side perspective view of a radiation gas heater by an embodiment of the present invention. FIG. 2 is a rear perspective view of the radiant gas heater of FIG. 1. It is a top perspective view of the radiation gas heater of FIG. It is a front perspective view of the radiation gas heater by an embodiment of the present invention without a glass cover. FIG. 5 is a front perspective view of the radiant gas heater of FIG. 4 including a glass cover. It is a top view of the test field for testing the heating characteristic of a radiation gas heater. FIG. 7 is a diagram of a paper strip used in the test field of FIG. It is a figure which compares and illustrates the temperature difference of a radiation gas heater which comprises a radiation gas heater and a glass cover. It is a figure which compares and illustrates the temperature difference of a radiation gas heater which comprises a radiation gas heater and a glass cover. It is a figure which compares and illustrates the temperature difference of a radiation gas heater which comprises a radiation gas heater and a glass cover. It is a figure which compares and illustrates the temperature difference of a radiation gas heater which comprises a radiation gas heater and a glass cover. It is a figure which compares and illustrates the temperature difference of a radiation gas heater which comprises a radiation gas heater and a glass cover. It is a figure which compares and illustrates the temperature difference of a radiation gas heater which comprises a radiation gas heater and a glass cover. It is a figure which compares and illustrates the temperature difference of a radiation gas heater which comprises a radiation gas heater and a glass cover.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas inlet 2 Air inlet 3 Housing 4 Gas burner 6 Reflector 7 Glass cover 8 Metal plate 9 Left side part 10 Right side part 11 Upper part 12 Lower side part 13 Back part 50 Plain white paper strip 50a Upper area | region 50b Middle area | region 50c Lower part Area 51 Core test field area 52 Heater 54 Rope 80 Radiant gas heater 82 Glass cover

Claims (9)

One or more gas inlets for receiving gas from a gas source;
One or more air inlets;
One or more gas burners in which gas from the one or more gas inlets is combusted using oxygen entered through the one or more air inlets;
One or more heat radiating elements that emit infrared radiation using energy generated by the one or more gas burners;
One or more reflectors for directing infrared radiation from the thermal radiation element;
One or more housings that house the one or more gas burners, the heat radiating element and the one or more reflectors;
One or more glass covers covering the one or more housings, wherein the one or more glass covers are positioned such that the infrared light is directed by the one or more reflectors through the one or more glass covers. A glass cover; and
The air inlet is a radiant gas heater that allows inflow of air into the housing and discharge of waste gas from the housing.   The radiant gas heater of claim 1, wherein the one or more glass covers are formed of glass that can withstand high temperatures and substantially transmit infrared light.   The radiant gas heater of claim 2, wherein the upper glass cover is formed from glass that is substantially opaque to visible light.   4. The one or more glass covers according to any one of claims 1 to 3, wherein the one or more glass covers are substantially the only part of the heater that is visible to an observer when the heater is installed. Radiant gas heater. A housing having a left side, a right side, an upper side, a lower side, a back side, and an open front;
A gas inlet on the left side of the housing for receiving gas from a gas source;
An air inlet located on the underside of the housing that allows inflow of air and allows escape of waste gas;
A lower air inlet in the housing, wherein gas from the gas inlet is combusted using oxygen entered through the one or more air inlets;
One or more gas burners located within the housing that radiate infrared using energy generated by the one or more gas burners;
A plurality of reflectors located within the housing for directing infrared radiation from a heat radiating element toward the open front of the housing;
One or more glass covers covering the open front side of the housing; and a radiant gas heater.   A radiant gas heater substantially as herein described with reference to FIGS.   The use of the heater according to any one of claims 1 to 5, for applying heat to a person or an object.   8. Use according to claim 7, in an internal or external location.   9. Use according to claim 8, wherein heat is provided substantially evenly throughout the location.