Method and arrangement for heating buildings with an infrared heater

Abstract

Method for heating buildings with an infrared heater (4), which comprises a radiant tube (6) arranged in a first building (2a), to which a gas heated by a burner (10) is supplied at a first end (8), wherein a second end of the radiant tube (6) is in flow connection with a heat exchanger (12) which is acted upon by the heated gas after leaving the radiant tube (6), wherein a radiator (20) or a domestic water dispenser is arranged in a second building (2b), which is connected to the heat exchanger (12) via lines (14a, 14b, 18a, 18b) in order to release the thermal energy absorbed by the heat exchanger (12) in the second building (2b) in the form of convection heat or heated domestic water, and a fan (24) is assigned to the radiant tube (6), which fan blows the heated gas through the heat exchanger (12) through the radiation tube (6), characterized in thatthat the first building (2a) is a hall and the second building (2b) is a residential building or a thermally insulated part of the first building (2a), and that the second end of the radiant pipe (6) is connected to the fan (24) via a supply line (22) which is thermally insulated from the environment.

Description

[0001] The invention relates to a method and an arrangement for heating buildings with an infrared heater according to the preamble of claims 1 and 8.

[0002] Such infrared heaters have been marketed by the applicant for a long time and comprise a generally horizontally suspended housing open at the bottom, in which a radiant tube is accommodated, which is supplied with heated air by a burner, in particular a gas burner, and a fan. Due to the temperature thus generated on the generally black outer surface of the radiant tube in the range of 300 °C to 750 °C, this radiates infrared radiation in the manner of a black body, which leads to a direct heating of the environment below the radiant tube. In this case, it is different from conventional building heating systems, in which radiators such asThe advantage of radiators is that in a building only the surfaces of people, animals and objects are heated by the infrared radiation, but not the air volume within the building, so that the infrared heaters described work comparatively economically and are therefore preferably used for heating halls.

[0003] EP 0 877 208 A2 discloses a radiant heat room heating system that emits heat radiation into a room via a hot air duct and heating surfaces arranged along the duct. Known infrared heaters of the aforementioned type suffer from the problem that the residual heat in the heated gas after leaving the radiant tube is only insufficiently utilized, which reduces the overall efficiency of the described infrared heaters.

[0004] Accordingly, it is an object of the present invention to provide a method and an arrangement with which the overall efficiency of heating buildings with an infrared heater can be improved.

[0005] This object is achieved according to the invention by the features of claims 1 and 8.

[0006] According to the invention, a method for heating buildings with an infrared heater, which has a radiant tube arranged in a first building, in particular in a hall, to which a gas heated by a burner is supplied at a first end, is characterized in that the second end of the radiant tube is in flow connection with a heat exchanger, which is acted upon, preferably flowed through, by the heated gas after leaving the radiant tube and which is preferably connected to a buffer storage for the coolant via a first coolant supply and return line.

[0007] Furthermore, a radiator or domestic water dispenser is arranged in a second building, for example, a residential building or a thermally insulated section of the first building. This radiator or domestic water dispenser is fluidly connected to the buffer tank to release the thermal energy of the coolant – preferably water – in the second building in the form of convection heat or heated domestic water. Reference to domestic water below also includes drinking water or water used, for example, as bathing water in swimming pools.

[0008] The radiator is, for example, a well-known radiator through which hot water flows, preferably stored in the buffer tank; but it can also be a plate-shaped ceiling heater through which hot water flows.

[0009] The buffer storage is preferably designed as a known stratified storage.

[0010] Although the use of a buffer tank is advantageous in terms of flexibility when heating the second building, it is also possible to connect the radiator or the hot water dispenser directly to the heat exchanger. In this case, the amount of heat energy supplied to the radiator and / or the domestic water dispenser can be varied, for example via a bypass mentioned below in conjunction with a switch for the heated gas, which is arranged upstream of the pipe branch between the heat exchanger and the bypass. One conceivable application for this is the heating of the pool water in a swimming pool located next to a conventional sports hall, in which heating is provided in an energy-saving manner via the infrared heaters mentioned above, which are suspended, for example, in the area of ​​the ceiling of the sports hall.

[0011] The invention provides the advantage that the residual heat remaining in the heated gas after flowing through the radiant tube is transferred via the heat exchanger and the coolant into the buffer tank, where it is available for heating a neighboring residential building, a separate area in the first building, or for heating domestic water. When water is used as the coolant or storage medium, the temperature in the buffer tank can be, for example, 60 to 80 °C.

[0012] According to a further embodiment of the method according to the invention, a fan is assigned to the radiant tube, which preferably conveys the heated gas through the heat exchanger and out of the radiant tube using negative pressure. This offers the advantage that the heat exchanger, with a given size, can be provided with a plurality of passages for the heated gas—hereinafter also referred to as exhaust gas—to increase the effective thermal surface, without the increased flow resistance adversely affecting the generation of the hot gas in the burner.

[0013] It is particularly advantageous if the fan is arranged upstream of the heat exchanger, since in this case the temperature of the exhaust gas can be reduced to such an extent that it condenses in the heat exchanger and the condensation heat of the exhaust gas can thus also be used to heat the buffer storage tank.

[0014] According to a further concept underlying the invention, the second end of the radiant tube is connected to the fan via a supply line, which is preferably thermally insulated from the environment. This offers the advantage that heat losses due to convection in the first building can be further reduced, so that the associated additional thermal energy in the exhaust gas can also be used to heat the second building, further increasing efficiency.

[0015] In the same way, it is also possible for the fan to be arranged upstream of the radiant tube, preferably upstream of the burner.

[0016] By using a throttle valve downstream of the blower and the heat exchanger, not only can the volume flow of heated exhaust gas be advantageously changed, but it is also possible to additionally regulate the condensation behavior of the exhaust gas in the heat exchanger, for which purpose, for example, a control and regulation device can be provided which changes the position of the throttle valve depending on another throttle valve upstream of the burner and / or the speed of the blower.

[0017] According to a further embodiment of the method according to the invention, which has already been indicated above, the heat exchanger is preferably assigned a bypass via which the heated gas can be passed past the heat exchanger in order to prevent damage to the cooling medium or the buffer storage in the event of overheating.

[0018] The storage medium for the heat transferred from the coolant in the buffer tank is preferably water, but can also be another medium. Likewise, the buffer tank can also be made of a solid material such as ceramic, metal, firebricks, or the like, which is heated by the coolant.

[0019] Although the method described above can be used in conjunction with an infrared heater comprising only one radiant tube, according to a further idea underlying the invention, it is also possible to use two or more infrared heaters with corresponding radiant tubes for heating the first building or also further buildings, which are connected to the heat exchanger via a common exhaust gas manifold, which is preferably thermally insulated from the environment by a known insulating material.

[0020] The invention is described below with reference to the drawing using a preferred embodiment.

[0021] The drawing shows Fig. 1 a schematic view of the essential components of the arrangement according to the invention for heating a first and second building.

[0022] As in Fig. As shown in Figure 1, an arrangement 1 according to the invention for carrying out the method described above comprises an infrared heater 4 arranged in a first building 2a, having a radiant tube 6, to which a gas heated by a burner 10 is supplied at a first end 8. The heated gas is preferably the exhaust gas from the burner 10, which in the preferred embodiment is designed as a known gas burner.

[0023] As the representation of Fig. 1, the arrangement 1 according to the invention further comprises a heat exchanger 12 through which the heated gas flows after leaving the radiant tube 6, and which is fluidly connected to a buffer storage tank 16 via a first coolant supply line 14a and a first coolant return line 14b, in which buffer storage tank the coolant - preferably water - heats a heat storage medium, preferably also water, contained in the buffer storage tank 16. The buffer storage tank 16 is connected via a second supply line 18a and a second return line 18b to a radiator 20 or also to a domestic water dispenser (not shown) in order to release the thermal energy stored in the buffer storage tank 16 in the second building 2b in the form of convection heat or to provide it in the form of heated domestic water.The second building 2b is, for example, a residential building or a sub-area of ​​the first building 2a, for example, a common room in a sports hall or a factory building or the like. The radiator 20, which can also be configured as underfloor heating, for example, can also be connected directly to the heat exchanger 12 via the lines 14a, 14b, or 18a, 18b in a manner not shown, without the use of a buffer tank 16.

[0024] As the representation of Fig. 1 can still be removed, a fan 24 is assigned to the radiation tube 6 via a supply line 22, which in the embodiment of the arrangement 1 shown is designed as a thermally insulated exhaust gas collection line for a total of three infrared heaters 4, which fan conveys the heated gas through the heat exchanger 12 out of the radiation tubes 6.

[0025] According to a further idea underlying the invention, the fan 24 is arranged upstream of the heat exchanger 12, wherein a throttle valve 26 is arranged downstream of the fan 24, via which the amount of heated gas passed through the radiant tube 6 can be changed.

[0026] The heat exchanger 12 preferably has such a size, or such a thermally effective surface, that the temperature of the heated gas in the heat exchanger 12 after leaving the radiant tube 6 is reduced to a value at which the heated gas condenses in the heat exchanger 12.

[0027] Finally, the heat exchanger 12 can be assigned a bypass (not shown in the figure), via which the heated gas can be passed past the heat exchanger 12 to prevent overheating of the buffer storage 16.

[0028] Although the coolant is preferably circulated in a closed circuit via a schematically indicated pump 28 through the heat exchanger 12 and the buffer storage tank 16 - which preferably also applies to the heating medium circulated through the radiator 20 via the second supply line 18a and return line 18b - it can alternatively be provided that the heat storage medium of the buffer storage tank 16 is passed directly through the heat exchanger 12 or the radiator 20. List of reference symbols 1 arrangement according to the invention 2a first building e.g. sports hall or factory hall 2b second building 4 Infrared heating 6 Radiation tube 8 first end 10 burners 12 heat exchangers 14a Coolant supply line 14b Coolant return line 16 buffer storage 18a second supply line 18b second return line 20 radiators 22 Supply line / collecting line 24 fans 26 Throttle valve 28 Pump

Claims

[1] Method for heating buildings with an infrared heater (4), which comprises a radiant tube (6) arranged in a first building (2a), to which a gas heated by a burner (10) is supplied at a first end (8), wherein a second end of the radiant tube (6) is in flow connection with a heat exchanger (12) which is acted upon by the heated gas after leaving the radiant tube (6), wherein a radiator (20) or a domestic water dispenser is arranged in a second building (2b), which is connected to the heat exchanger (12) via lines (14a, 14b, 18a, 18b) in order to release the thermal energy absorbed by the heat exchanger (12) in the second building (2b) in the form of convection heat or heated domestic water, and a fan (24) is assigned to the radiant tube (6), which fan blows the heated gas through the heat exchanger (12) out of the radiation tube (6), characterized bythat the first building (2a) is a hall and the second building (2b) is a residential building or a thermally insulated part of the first building (2a), and that the second end of the radiant pipe (6) is connected to the fan (24) via a supply line (22) which is thermally insulated from the environment. [2] Method according to claim 1, characterized by that the heat exchanger (12) is connected to a buffer storage (16) for a coolant via a first coolant supply and coolant return line (14a, 14b), and that the thermal energy stored in the buffer storage (16) is released in the second building (2b) in the form of convection heat or heated domestic water. [3] Method according to claim 2, characterized by that the fan (24) is arranged upstream of the heat exchanger (12). [4] Method according to one of the preceding claims, characterized bythat a throttle valve (26) is arranged downstream of the fan (24), via which the quantity of heated gas passed through the radiation tube (6) can be varied. [5] Method according to one of the preceding claims, characterized by that the heat exchanger (12) is of such a size that the temperature of the heated gas in the heat exchanger (12) is reduced to the condensation range of the gas. [6] Method according to one of the preceding claims, characterized by that the heat exchanger (12) is assigned a bypass via which the heated gas can be passed past the heat exchanger (12). [7] Method according to one of the preceding claims, characterized by that the radiant tubes (6) of further infrared heaters (4) for heating the first building (2a) or further buildings are connected to the heat exchanger (12) via a common, in particular thermally insulated, collecting line (22). [8] Arrangement (1) for carrying out the method according to one of the preceding claims, comprising an infrared heater (4) arranged in a first building (2a) with a radiation tube (6) to which a gas heated by a burner (10) is supplied at a first end (8), a heat exchanger (12) which is acted upon by the heated gas after leaving the radiant tube (6), and a radiator (20) or domestic water dispenser arranged in a second building (2b), which is fluidly connected to the heat exchanger (12) via lines (14a, 14b, 18a, 18b) in order to release the thermal energy absorbed by the heat exchanger (12) in the second building (2b) in the form of convection heat or heated domestic water, wherein the radiant tube (6) is assigned a fan (24) which conveys the heated gas through the heat exchanger (12) out of the radiant tube (6), characterized by , that the first building (2a) is a hall and the second building (2b) is a residential building or a thermally insulated part of the first building (2a), and that the second end of the radiant pipe (6) is connected to the fan (24) via a supply line (22) which is thermally insulated from the environment. [9] Arrangement (1) according to claim 8, characterized by in that the heat exchanger (12) is connected via a first coolant supply and coolant return line (14a, 14b) to a buffer storage tank (16) which is connected to the radiator (20) or the domestic water dispenser via lines (18a, 18b) in the second building (2b) for releasing the thermal energy stored in the buffer storage tank (16). [10] Arrangement (1) according to claim 8 or 9, characterized by that the fan (24) is arranged upstream of the heat exchanger (12). [11] Arrangement (1) according to one of claims 8 to 10 characterized bythat a throttle valve (26) is arranged downstream of the fan (24), via which the quantity of heated gas passed through the radiation tube (6) can be varied. [12] Arrangement (1) according to one of claims 8 to 11, characterized by that the heat exchanger (12) is of such a size that the temperature of the heated gas in the heat exchanger (12) is reduced to the range of the condensation temperature of the gas. [13] Arrangement (1) according to one of claims 8 to 12, characterized by that the heat exchanger (12) is assigned a bypass via which the heated gas can be passed past the heat exchanger (12). [14] Arrangement (1) according to one of claims 8 to 13, characterized by that the radiant tubes (6) of further infrared heaters (4) for heating the first building (2a) or further buildings are connected to the heat exchanger (12) via a common, in particular thermally insulated, collecting line (22).

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