Heating system

Abstract

To provide a heating system that has more excellent energy efficiency than conventional systems by using heat of exhaust gas generated in an indoor side and thus reduce air-conditioning cost.SOLUTION: A heating system 10 includes: an exhaust gas discharge device 11 that is disposed in an exhaust gas generation space 1 where high-temperature exhaust gas G is generated of an indoor space and that can discharge the exhaust gas G from the exhaust gas generation space 1; an attic space 12 formed at a position adjacent to a heating target space 2 via a ceiling part 13 of the heating target space 2; a guide passage 14 capable of guiding the exhaust gas G discharged from the exhaust gas generation space 1 to the attic space 12; and a communication passage 15 that communicates between the attic space 12 and an external space 3. The ceiling part 13 is made of metal.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a heating system, and particularly to a heating system by heat radiation using the heat of exhaust gas.

Background Art

[0002] Conventionally, in a laboratory for an automotive engine, the engine is actually driven by combustion to inspect the performance of the engine, and the exhaust gas generated at this time is discharged outdoors. On the other hand, in an indoor workplace adjacent to this engine laboratory, if it is not possible to use air conditioning only for the worker and the immediate vicinity (so-called spot air conditioning) due to reasons such as the work position not being fixed, air conditioning for the entire indoor workplace is required, and a large air conditioning cost has been a problem.

[0003] Here, as a means for efficiently achieving air conditioning in an indoor workplace, for example, the air conditioning system described in Patent Document 1 has been proposed. This air conditioning system is installed in a factory where water (exhaust warm water) generated by cooling various facilities in the factory such as spot welding machines is produced, and an external conditioner having a heater that heats the outside air taken in from an outside air intake port and a cooling coil that cools the outside air, a heat pump that heats and supplies a heating medium to the heater and cools and supplies a cooling medium to the cooling coil, and a heat exchanger that heats the cooling medium. Further, as a heating medium for the cooling medium introduced into the heat exchanger, in addition to or instead of the above-described exhaust warm water, heat (waste heat) generated in the factory such as exhaust gas, exhaust gas, makeup water, heat radiation from equipment, heat radiation from workpieces, and exhaust heat from air conditioning can be used through a predetermined medium.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, as described in Patent Document 1, even in an air conditioning system that utilizes waste heat generated in a factory, the utilization of waste heat is limited to a part of the energy required for air conditioning (heating of the cooling medium by a heat exchanger), and a corresponding amount of electric power is required to drive a heat pump or an outdoor unit. Therefore, it is difficult to sufficiently reduce the air conditioning cost for a huge factory space.

[0006] The above-described problem is not limited to factories, and can occur in all buildings where work that generates exhaust gas indoors can be performed.

[0007] In view of the above circumstances, the present specification aims to provide a heating system that is more energy-efficient than conventional ones by utilizing the heat of exhaust gas generated indoors, thereby reducing air conditioning costs, which is a technical problem to be solved.

Means for Solving the Problem

[0008] The solution to the above problem is achieved by a heating system according to the present invention. That is, this heating system is disposed in an exhaust gas generation space where exhaust gas at a temperature higher than the atmosphere is generated in an indoor space, and includes an exhaust gas discharge device capable of discharging the exhaust gas from the exhaust gas generation space, a ceiling space formed at a position adjacent to the heating target space through the ceiling of the heating target space, a guide path capable of guiding the exhaust gas discharged from the exhaust gas generation space to the ceiling space, and a communication path that puts the ceiling space and the external space in a communicating state, and is characterized in that the ceiling portion is made of metal.

[0009] When the heating system according to the above configuration is used, the following operational effects can be obtained. That is, when a predetermined exhaust gas is generated in the exhaust gas generation space, the exhaust gas is sent into the ceiling space through the guide path by the exhaust gas discharge device disposed in the exhaust gas generation space. Here, since the ceiling portion between the ceiling space and the space to be heated is made of metal, it exhibits a very high thermal conductivity and heat transfer rate compared to gypsum or concrete as conventional ceiling building materials. Therefore, when the exhaust gas sent into the ceiling space is a gas at a higher temperature than the atmosphere, the heat from the exhaust gas is efficiently transmitted through the inside of the metal ceiling portion to the surface on the side of the space to be heated of the ceiling portion, and the space to be heated is heated by the heat radiation of the ceiling portion. Also, since a communication path that puts both spaces in a communicating state is provided between the ceiling space and the external space, the sent exhaust gas passes through the ceiling space and is discharged to the external space. As described above, according to the heating system of the present invention, while safely discharging the exhaust gas to the external space, the space to be heated can be efficiently heated by utilizing the heat transmitted from the exhaust gas during the discharging process. Also, the energy (such as electricity) that needs to be purchased at this time is, in principle, only the amount used to drive the device that discharges the exhaust gas, so it is possible to keep the air-conditioning cost lower than before.

[0010] Also, in the heating system according to the present invention, the ceiling portion may be made of stainless steel.

[0011] By making the ceiling portion made of metal, the heat of the exhaust gas can be efficiently utilized for the heat radiation of the ceiling portion. On the other hand, depending on the type of exhaust gas, there may be a high possibility of mixing corrosive substances. Therefore, if the material of the ceiling portion is selected only considering the thermal conductivity and heat transfer rate, the ceiling portion may be corroded by the exhaust gas, and in some cases, the exhaust gas may leak into the space to be heated through the corroded portion. In this regard, in this configuration, since the ceiling portion is made of stainless steel, while imparting a thermal conductivity and heat transfer rate equivalent to that of steel to the ceiling portion, the corrosion resistance of the ceiling portion is improved by the oxide film formed on the surface, and it is possible to ensure the safety of the space to be heated.

[0012] In addition, in the heating system according to the present invention, a treatment for increasing the emissivity may be performed on the surface of the ceiling portion on the heating target space side.

[0013] As described above, since the heating system according to the present invention heats the space to be heated by the heat radiation of the ceiling portion using the heat transmitted from the exhaust gas as an energy source, there is nothing better than efficient heat radiation of the ceiling portion. In this regard, in this configuration, since a treatment for increasing the emissivity is performed on the surface of the ceiling portion on the heating target space side, it is possible to increase the emissivity with respect to the heating target space and more effectively heat the heating target space. In addition, since the surface (lower surface) of the ceiling portion on the heating target space side is not particularly likely to come into contact with any object, a treatment for improving the emissivity (for example, blackbody painting) can be performed without any particular limitation.

[0014] In addition, in the heating system according to the present invention, the exhaust gas generation space may be an engine test room.

[0015] For example, when an automobile engine is actually driven, the temperature of the exhaust gas generated by the combustion of fuel in the combustion chamber reaches a very high temperature of 150°C to 700°C depending on the driving state of the engine. Therefore, by sending the exhaust gas generated when this type of engine is actually driven in an engine test room into the ceiling space according to the present invention, the ceiling portion can be heated more effectively, and the heat radiation performance can be further improved. Therefore, even when a very large indoor workplace is the space to be heated, it is possible to efficiently heat the space.

Effects of the Invention

[0016] As described above, according to the heating system of the present invention, it is possible to perform heating with better energy efficiency than before by using the heat of the exhaust gas generated indoors. In addition, since the heat transmitted from the exhaust gas to the ceiling portion is used as an energy source for heat radiation, it is not necessary to generate the energy for heat radiation by the purchased electric power. Therefore, it is also possible to reduce the air conditioning cost compared to the prior art.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Mode for Carrying Out the Invention

[0018] Hereinafter, the content of a heating system according to an embodiment of the present invention will be described with reference to the drawings.

[0019] FIG. 1 shows the overall configuration of a heating system 10 according to an embodiment of the present invention. This heating system 10 includes an exhaust gas discharge device 11 disposed in an exhaust gas generation space 1 which is an indoor space, a ceiling space 12 located above a heating target space 2 which is an indoor space, a ceiling portion 13 forming the ceiling of the heating target space 2 and partitioning the ceiling space 12 and the heating target space 2, a guide path 14 capable of guiding exhaust gas G discharged from the exhaust gas generation space 1 to the ceiling space 12, and a communication path 15 putting the ceiling space 12 and the external space 3 in a communicating state.

[0020] In this embodiment, the exhaust gas generation space 1 and the heating target space 2 are arranged adjacent to each other. However, of course, the two spaces 1 and 2 may be arranged at positions separated from each other. Further, in this embodiment, the case where the exhaust gas generation space 1 and the heating target space 2 are arranged indoors in the same building is exemplified. However, of course, they may be respectively arranged indoors in different buildings.

[0021] The exhaust gas discharge device 11 is configured to discharge the exhaust gas G generated in the exhaust gas generation space 1 to the outside of the exhaust gas generation space 1, and is composed of, for example, an exhaust fan. A guide path 14 is connected to the exhaust gas discharge device 11, and the exhaust gas G discharged by the exhaust gas discharge device 11 is sent into the guide path 14. Note that the size (output) and the number of the exhaust gas discharge devices 11 are preferably set appropriately according to the output and the number of the exhaust gas generation engines (here, the engine 4) installed in the exhaust gas generation space 1.

[0022] The ceiling space 12 is located above the space (heating target space 2) to be heated by the heating system 10, and is partitioned from the heating target space 2 through the ceiling portion 13 of the heating target space 2. Here, the form of the ceiling space 12 is arbitrary in principle, but in view of efficiently and evenly heating the heating target space 2, it is preferably set to a planar shape according to the shape of the heating target space 2 in plan view. For example, as shown in FIG. 2, when the heating target space 2 is rectangular in plan view, the ceiling space 12 is formed in a shape (rectangular shape) and size that cover the entire upper part of the heating target space 2. Further, the vertical dimension of the ceiling space 12 is appropriately set based on, for example, the flow rate of the exhaust gas G assumed to be sent into the ceiling space 12, the volume of the ceiling space 12, and further, the relationship between the discharge amount of the exhaust gas G through the communication path 15, or the relationship with the height dimension of the heating target space 2 itself.

[0023] Further, in the present embodiment, as shown in FIG. 2, the downstream end 14a of the guide path 14 opens on one side of the ceiling space 12, and the communication path 15 opens on the other side of the ceiling space 12 facing the downstream end 14a (opening) of the guide path 14.

[0024] At least the ceiling portion 13 facing the heating target space 2 in the ceiling space 12 is formed of metal. In the present embodiment, the entire ceiling space 12 is partitioned and formed by a metal box-shaped body 16 having a rectangular parallelepiped shape. In this case, the lower plate portion of the box-shaped body 16 forms the ceiling portion 13.

[0025] Here, the material of the ceiling portion 13 is arbitrary as long as it is metal. For example, when considering strength and corrosion resistance, stainless steel can be preferably adopted. Alternatively, various plated steel sheets such as galvanized steel sheet (registered trademark) can also be adopted for the ceiling portion 13 as a sheet material with excellent corrosion resistance.

[0026] Further, a treatment for increasing the emissivity may be performed on the surface 13a on the heating target space 2 side of the ceiling portion 13. Specific examples include surface treatment such as roughening and coating treatment such as blackbody painting.

[0027] Next, an example of the usage mode of the heating system 10 with the above configuration will be described together with the operational effects.

[0028] First, start driving one or more engines 4 installed in the engine test chamber that becomes the exhaust gas generation space 1, and measure the state of the engine 4 during driving by the dynamometer 5 to evaluate the performance of the engine 4. At this time, high-temperature (for example, 150°C to 700°C) exhaust gas G accompanying combustion is generated inside the engine 4. Therefore, when the engine 4 is driven, by operating the exhaust gas discharge device 11, the exhaust gas G generated in the exhaust gas generation space 1 is drawn into the guide path 14 and sent into the ceiling cavity 12 where the downstream end 14a of the guide path 14 is open (see FIG. 1).

[0029] Here, since the ceiling portion 13 between the ceiling space 12 and the space 2 to be heated is made of metal, it exhibits a very high thermal conductivity and heat transfer rate compared to gypsum or concrete as conventional ceiling materials. Therefore, when the exhaust gas G fed into the ceiling space 12 is the gas generated by the combustion inside the engine 4, the heat from the exhaust gas G efficiently passes through the inside of the metal ceiling portion 13 and is transmitted to the surface 13a of the ceiling portion 13 on the side of the space 2 to be heated, and the space 2 to be heated is heated by the heat radiation of the ceiling portion 13 (in FIG. 1, the radiant heat rh is shown). Further, since the ceiling space 12 is provided with a communication passage 15 for communicating with the external space 3, while the engine 4 is driving, the exhaust gas G in a high-temperature state is continuously fed into the ceiling space 12 and discharged to the external space 3 through the communication passage 15. Therefore, the heating of the space 2 to be heated by the heat radiation of the ceiling portion 13 is continued. As described above, according to the heating system 10 according to the present embodiment, while safely discharging the exhaust gas G to the external space 3, the heat transmitted from the exhaust gas G to the ceiling portion 13 in the discharging process can be used to efficiently heat the space 2 to be heated. Further, the energy (such as electricity) that needs to be purchased at this time is, in principle, only the amount used for driving the exhaust gas discharge device 11, so that the air conditioning cost can be kept lower than before.

[0030] Further, in the present embodiment, since the ceiling portion 13 is made of stainless steel, while imparting a thermal conductivity and heat transfer rate equivalent to steel to the ceiling portion 13, the corrosion resistance of the ceiling portion 13 can be improved by the oxide film formed on the surface 13a. Therefore, it is possible to avoid the situation where the ceiling portion 13 is corroded by the exhaust gas G and ensure the safety of the space 2 to be heated.

[0031] Further, in the present embodiment, the entire ceiling space 12 is configured by a box-shaped body 16, and the ceiling portion 13 is configured by the lower plate portion of the box-shaped body 16. Therefore, the airtightness of the ceiling space 12 excluding the flow of the exhaust gas G through the guide path 14 and the communication passage 15 can be easily increased. Therefore, it is possible to surely prevent the situation where the exhaust gas G fed into the ceiling space 12 leaks into the indoor workplaces such as the space 2 to be heated and guarantee the soundness of the working environment.

[0032] As described above, one embodiment of the present invention has been described. However, the heating system according to the present invention can adopt configurations other than the above as long as it does not deviate from the gist thereof.

[0033] For example, when the exhaust gas generation space 1 is an engine test chamber as in the above embodiment, the temperature of the exhaust gas G generated by the combustion inside the engine 4 is very high and varies greatly depending on the driving state of the engine 4 (150°C to 700°C). FIG. 3 shows an example of a heating system 20 according to a configuration suitable for the case where the exhaust gas G varies greatly in a very high temperature range as described above. This heating system 20 includes a branch path 21 that branches from the guide path 14 and leads to the external space 3, a communication state between the exhaust gas generation space 1 and the ceiling space 12 through the guide path 14, and a communication state between the exhaust gas generation space 1 and the external space 3 through the branch path 21. It further includes a switching mechanism 22 that can be switched, an exhaust gas thermometer 23 that can measure the temperature T of the exhaust gas G, and a control unit 24 that controls the switching mechanism 22.

[0034] The branch path 21 branches, for example, from an intermediate position of the guide path 14 extending from the exhaust gas discharge device 11 as shown in FIG. 3, and the downstream end 21a opens to the external space 3. Further, the control unit 24 can switch the communication state between the exhaust gas generation space 1 and the ceiling space 12 and the communication state between the exhaust gas generation space 1 and the external space 3 based on the temperature T of the exhaust gas G measured by the exhaust gas thermometer 23 attached to the engine 4 or in its vicinity, for example. Specifically, for example, when the temperature T of the exhaust gas G measured by the exhaust gas thermometer 23 is less than a preset threshold value (for example, 600°C), the control unit 24 sends a command to the switching mechanism 22 to switch to the communication state with the ceiling space 12. As a result, the exhaust gas G at an appropriate temperature for heating the heating target space 2 by the heat radiation of the ceiling portion 13 is sent into the ceiling space 12 through the guide path 14 (the flow shown by the solid line in FIG. 3).

[0035] On the one hand, when the temperature T of the measured exhaust gas G is equal to or higher than a preset threshold value (for example, 600°C), the control unit 24 sends a command to the switching mechanism 22 to switch to the communication state with the external space 3. As a result, the exhaust gas G at a temperature excessive for heating by the heat radiation of the ceiling part 13 is discharged to the external space 3 through the guide path 14 and the branch path 21 (the flow indicated by the broken line in FIG. 3). Therefore, excessive heating by the heat radiation of the ceiling part 13 is avoided.

[0036] Of course, both of the above-described two embodiments are merely examples. For example, although illustration is omitted, the heating system according to the present invention may be configured such that an appropriate amount of air is supplied to the exhaust gas G in the guide path 14 according to the temperature of the measured exhaust gas G to lower the temperature of the exhaust gas G to an appropriate temperature range. In this case, it is possible to always heat the space 2 to be heated at the time of generation of the exhaust gas G regardless of the temperature of the exhaust gas G.

[0037] In addition, in the above description, the case where the exhaust gas G of the engine 4 is used in the heating system according to the present invention is illustrated. Of course, the present invention is not limited to this. Even for a device or facility that generates exhaust gas G other than the engine 4, the heating system according to the present invention can be applied.

[0038] In addition, in the above description, the case where the space adjacent to the exhaust gas generation space 1 in the same building is used as the space 2 to be heated is illustrated. Of course, the present invention is not limited to this. As long as the exhaust gas G can be supplied to the ceiling space 12 through the exhaust gas discharge device 11 and the guide path 14, the exhaust gas generation space 1 and the space 2 to be heated are arbitrary.

Explanation of Reference Numerals

[0039] 1 Exhaust gas generation space 2 Space to be heated 3 External space 4 Engine 5 Dynamometer 10, 20 Heating system 11 Exhaust gas discharge device 12 Ceiling space 13 Ceiling part 13a Surface (side of the space to be heated) 14 Guide Road 15 Connecting Road 16 Box-shaped Body 21 Branch Road 22 Switching Mechanism 23 Exhaust Gas Thermometer 24 Control Unit G Exhaust Gas T Temperature rh Radiant Heat

Claims

Claim 1 An exhaust gas discharge device disposed in an exhaust gas generation space in an indoor space where exhaust gas hotter than the atmosphere is generated, and capable of discharging the exhaust gas from the exhaust gas generation space; A ceiling space formed at a position adjacent to the heating target space through the ceiling of the heating target space; A guide path capable of guiding the exhaust gas discharged from the exhaust gas generation space to the ceiling space; A communication path that puts the ceiling space and the external space in a communicating state, and A heating system characterized in that the ceiling portion is made of metal.

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