ES1263589U - RADIANT DUCT HEATING SYSTEM (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Radiant duct heating system (1), including: - A closed circuit (2) of radiant conduits, which includes at least one radiant conduit (3) that develops between a first inlet section (4) and a first outlet section (5), is capable of being traversed by a hot carrier fluid (PV), and is suitable for being located in an indoor environment (1) to transfer, by radiation, at least a part of the heat of said carrier fluid (PV) to said indoor environment (I); - A thermal module (6) suitable to be located in an outdoor environment (E) separated from said indoor environment (I) by at least one wall (P), whose thermal module (6) includes: - a burner (7), which is located to intercept said closed circuit (2), which is equipped with a combustion chamber (CC) capable of generating combustion products at high temperature, and which is connected in fluid relation to the first inlet section (4) of said radiant conduit (3) for introducing into said radiant conduit (3) said combustion products capable of forming, at least in part, said carrier fluid (FV); - At least one fan (8), which is located to intercept said closed circuit (2), which has a suction mouth (9) in fluid communication with the first outlet section (5) of said radiant duct (3), and with a discharge mouth (10) in fluid communication with said burner (7), and which is prepared to circulate, through said radiant conduit (3), said carrier fluid (FV) in depression; - an expulsion conduit (11), which develops between an inlet part (12), which is connected in fluid relationship with said closed circuit (2) to extract a part of said carrier fluid (FV) to be expelled as exhaust fumes (FE) in said outdoor environment (E), and an outlet part (13); said heating system (1) is characterized by including a direct exchange heat recovery unit (14), which is connected to said exhaust duct (11) and includes at least one auxiliary radiant duct (15), which includes : - a second inlet section (16) connected to the outlet part (13) of said exhaust duct (11) to receive said exhaust fumes (FE); - a second outlet section (17) intended to be in fluid communication with said external environment (E) to expel said exhaust fumes (FE) in said external environment (E), - a radiation section (19) that develops between said second inlet section (16) and said second outlet section (17) and capable of being placed in said interior environment (I) to yield, at least by radiation, to the minus a part of the heat from said exhaust fumes (FE) to said interior environment (I). (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

RADIANT DUCT HEATING SYSTEM

Scope

The present finding relates to a radiant duct heating system, according to the preamble of the independent main claim.

The system in question is advantageously intended for use in an industrial or commercial environment to heat, in particular, large premises both for total heating and for heating partial areas of the premises.

State of the art

As is already known, there have been different radiant band heating systems on the market for years that are placed a little below the ceiling of the premises to be heated, so that the radiation heat is emitted on the things or people that are being heated. found below, preferably with thermal radiation in the infrared field.

Said systems of known type traditionally include closed-loop radiant pipes, called in the jargon of the sector "radiant bands", which are connected to a burner, where a fuel mixture composed of air and gas is burned. This mixture produces a flow of combustion products at high temperature that is introduced into the closed circuit of the radiant pipes.

Said circuit of the system is intercepted by a fan located advantageously close to and before the burner, so that the entire circuit of the radiating ducts is subjected to a depression also capable of keeping the system safe. The flow of combustion gases produced by the burner is mixed in the closed circuit with a flow of combustion products already introduced and in circulation, heating it, to form a heating carrier fluid that is circulated in depression by the action of the fan. .

The section of the circuit between the aforementioned fan and the burner is under pressure, and there is placed an intake of a smoke duct with the function of receiving under pressure a part of the heating carrier fluid and expelling it in the form of combustion fumes, through the aforementioned conduit, directly into the external environment.

In recent years, also in the industrial field of space heating, there is a need to increase the overall thermal efficiency of the devices intended for this purpose, especially due to the increasingly restrictive legislative reference standards required for the thermal heating installations thermal combustion yields (measured at the chimney outlet) of higher performances and a better quality of emissions into the atmosphere.

In order to increase the thermal efficiency of the appliances, radiant strip systems equipped with heat recovery devices located to intercept the flue gas discharge chimney are known. These devices transfer the heat recovered from the chimney by means of a carrier fluid that transfers heat to the environment to be heated by means of a smoke-water heat exchanger, generally installed outside the environment to be heated.

The apparatuses for heating industrial environments of the type known so far described synthetically, in practice, are not without drawbacks.

The biggest drawback is that, since the smoke-water heat exchanger is installed outside the room to be heated, it can be subjected to extreme climatic conditions (low temperatures) capable of causing problems for the components installed there, such as pumps. water circulation and electrical / electronic security systems.

Another drawback is that, to arrive at the value of thermal efficiency (yield of combustion) required by the current standards of the industrial sector of space heating, the smoke-water heat exchange systems used for heat recovery and coupled to the radiant bands in order to increase the thermal efficiency of the system, need the adoption of high-efficiency heat exchangers, in addition to safety systems that are also reliable at extreme temperatures, that is, designed to be installed outdoors, and all this implies a high cost for the entire system.

Presentation of the invention

In this framework, the main purpose of the present finding is to overcome the drawbacks of the technique already known and described above, presenting a radiant duct heating system that is in a position to improve the combustion efficiency measured in the fumes expelled by the chimney, and that it is also a system with limited costs, more precisely, acceptable by the market and competitive with other heating technologies for industrial environments available today.

Another purpose of the present finding is to provide an operationally simple and reliable radiant strip heating system.

The present invention relates to a radiant duct heating system, which includes:

- a closed circuit of radiant conduits, which includes at least one radiant conduit that develops between a first inlet section and a first outlet section, is capable of being traversed by a hot carrier fluid, and is suitable to be located in a indoor environment to transfer, by radiation, at least a part of the heat of said carrier fluid to said indoor environment;

- a thermal module suitable for being located in an outdoor environment separated from said indoor environment by at least one wall, whose thermal module includes:

- a burner, which is located to intercept said closed circuit, which is equipped with a combustion chamber capable of generating products of combustion at high temperature, and which is connected in fluid relation to the first inlet section of said radiant conduit to introduce into said radiant conduit said combustion products capable of forming, at least in part, said carrier fluid;

- at least one fan, which is located to intercept said closed circuit, which has a suction port in fluid communication with the first outlet section of said radiant conduit, and with a discharge port in fluid communication with said burner , and which is prepared to circulate, through said radiant conduit, said carrier fluid in depression;

- an expulsion conduit, which develops between an inlet part, which is connected in fluid relationship with said closed circuit to extract a part of said carrier fluid to be expelled as exhaust fumes in said external environment, and a part of exit;

said heating system is characterized by including a direct exchange heat recovery unit, which is connected to said exhaust duct and includes at least one auxiliary radiant duct, which includes:

- a second inlet section connected to the outlet part of said exhaust duct to receive said exhaust fumes;

- a second outlet section destined to be in fluid communication with said external environment to expel said exhaust fumes in said external environment, - a radiation section that develops between said second inlet section and said second outlet section and suitable to be placed in said indoor environment to transfer, at least by radiation, at least a part of the heat of said exhaust fumes to said indoor environment.

In some embodiments, in the heating system said closed circuit includes a pressure section that extends between the discharge mouth of said fan and said burner, to whose pressure section the inlet part of said expulsion conduit is connected.

In some embodiments of the heating system, said auxiliary radiant duct develops, starting from said second inlet section, following said exhaust duct.

In some embodiments of the heating system, said radiant conduit includes a continuous band of metallic material that spirals to form a substantially tubular body.

In some embodiments of the heating system, said auxiliary radiant conduit includes a continuous band of metallic material that spirals to form a substantially tubular body.

In some embodiments of the heating system, the radiation section of said auxiliary radiant conduit includes:

- a splice part, which develops with a curve substantially 180 °;

- a flow part extending between said second inlet section and said splice part;

- a return part extending between said splice part and said second outlet section.

In some embodiments of the heating system, said radiation stretch runs substantially rectilinear from said second inlet section to said second outlet section.

In some embodiments of the heating system, said auxiliary radiant duct is located near said radiant duct.

In some embodiments of the heating system, said direct exchange heat recovery unit includes one or more second external fans located on the radiation section of said auxiliary radiant conduit, and capable of transporting a flow of ambient air against said radiation path.

In some embodiments of the heating system, said direct exchange heat recovery unit includes at least one reflector positioned above the radiation span of said auxiliary radiant duct and has a reflecting surface directed downward to reflect part of the radiation emitted by said auxiliary radiant conduit.

In some embodiments of the heating system, said thermal module includes: - first supply means connected to said burner and prepared to introduce a flow of air into said burner;

- second supply means connected to said burner and prepared to introduce a flow of gas into said burner, so as to form, in said combustion chamber, a combustible mixture of said air and said gas;

- ignition means that can be operated to generate a combustion of said fuel mixture with the consequent generation of said hot combustion products.

In some embodiments of the heating system, said exhaust duct has a lining of thermal insulating material, which is placed on at least one outer section of said exhaust duct intended to be located in said external environment.

In some embodiments of the heating system, said direct exchange heat recovery unit includes an evacuation chimney, which is connected to the second outlet section of said auxiliary radiant duct and has an expulsion opening suitable for being placed in said outdoor environment to expel said exhaust fumes into said outdoor environment.

Brief description of the drawings

The technical characteristics of the invention, according to the proposed function and purposes, can be clearly observed in the content of the claims set out below, and the advantages of the invention will be more evident in the detailed description of some embodiments, according to the invention, illustrated by way of non-limiting example, in the attached drawing sheets where:

figure 1 shows a diagram of the heating system object of the present invention, according to a first embodiment;

Figure 2 illustrates a diagram of the heating system object of the present invention, according to a second embodiment.

Detailed description of an example of a preferred embodiment With reference to the attached drawings, a radiant duct heating system is indicated in general with the number 1, according to some preferred embodiments of the present finding.

It is intended to be used mainly for the air conditioning of the rooms by means of radiation in industrial and commercial environments.

The radiant duct heating system 1 includes a closed circuit 2 of radiant ducts that takes place entirely in an indoor environment I and is properly located on the ceiling so that it covers the area to be heated.

Advantageously, this closed circuit 2 of radiant conduits includes a radiant conduit 3 obtained with metal pipes with high thermal emission in the infrared field, which, depending on the requirements, is developed with a length that can be up to up to 300 meters.

Preferably, the radiant conduit 3 includes a continuous band of metallic material that spirals to form a substantially tubular body.

Advantageously, this radiant conduit 3 is located in the interior environment I and is develops between a first inlet section 4 and an outlet section 5, and is capable of being passed through by a hot carrier fluid PV. The latter heats the outer surfaces of the radiant conduit 3, which give up, mainly by radiation, a part of the heat that the hot PV carrier fluid possesses to the interior environment I.

Advantageously, the heating system 1, according to the present invention, includes a thermal module 6 placed mainly in an outdoor environment E separated from said indoor environment I by a wall P, which can also be the cover of the indoor environment I , either masonry or sandwich panel, and sized to hold the thermal module 6.

The thermal module 6 includes a burner 7 that can advantageously be fired with gas or diesel and is intercepting the closed circuit 2 of radiant conduits; it has a CC combustion chamber connected to burner 7 and from which high temperature combustion products are generated.

Advantageously, in the thermal module 6 are present the first supply means 24 prepared to introduce a flow rate of air A into the burner 7. Also present in the thermal module 6 are the second supply means 25 prepared to introduce a flow rate of gas G in burner 7, so that an oxidizing mixture is formed in the combustion chamber CC between air A and gas G.

Advantageously, the ignition means 26 are also present in the thermal module 6 which can be actuated to generate the combustion of the fuel mixture C with the consequent generation in the combustion chamber CC of the hot combustion products.

The thermal module 6 is also connected in fluid relationship with the first inlet section 4 of the radiant conduit 3, in order to be able to introduce therein the high temperature combustion products that are going to form, at least in part, the PV carrier fluid. hot intended to circulate through the radiant duct 3.

The thermal module 6 includes a fan 8 positioned to intercept the closed circuit 2 of radiant ducts and is provided with a suction mouth 9 in fluid communication with the first outlet section 5 of the radiant duct 3, it also has a discharge mouth 10 in fluid communication with the burner 7, to make the hot PV carrier fluid circulate, always in depression, through the radiant conduit 3.

In the thermal module 6, the closed circuit 2 of radiant conduits is advantageously intercepted, which includes a pressure section 20, which extends between the discharge mouth 10 of the fan 8 and the burner 7; The inlet part 12 of an expulsion conduit 11 is connected to the pressure section 20, which takes a part of the hot carrier fluid FV, to then be expelled as exhaust fumes FE into the external environment E.

Advantageously, the expulsion conduit 11 develops between the inlet part 12 connected in fluid relationship with the closed circuit 2 of radiant conduits in order to be able to take a part of carrier fluid PV, and an outlet part 13; the outlet part 13 of the expulsion duct 11 is preferably located close to the wall P or the cover of the indoor environment I.

Advantageously, the expulsion duct 11 has a coating of thermal insulating material, which is placed on the outer section 11E of the expulsion duct 11 intended to be located in the external environment E.

The heating system 1, according to the present invention, also includes a direct exchange heat recovery unit 14, located inside room I to be able to transfer part of the heat from the exhaust fumes FE to said room I, and connected to the ejection conduit 11 through the outlet portion 13 thereof. Advantageously, the direct exchange heat recovery unit 14 includes an auxiliary radiant conduit 15, downstream of the exhaust conduit 11, to be able to receive FE exhaust fumes; it has a second inlet section 16, connected to the outlet part 13 of the expulsion conduit 11, and with a second outlet section 17 destined to be in fluid communication with the external environment E to evacuate the exhaust fumes FE in the outdoor environment E.

Preferably, the auxiliary radiant conduit 15 includes a continuous band of metallic material that spirals to form a substantially tubular body.

Preferably, the auxiliary radiant conduit 15 has a radiation section 19 that develops between the second inlet section 16 and the second outlet section 17; the radiation section 19 is located in the interior environment I to transfer, mainly by radiation, at least a part of the heat of the exhaust fumes FE to the interior environment I. Preferably, in relation to the example of Fig. 1, the section of radiation 19 of the auxiliary radiant conduit 15 includes a junction portion 21 that develops with a curve of the path substantially 180 °.

Preferably, as shown in Fig. 1, the radiation section 19 of the auxiliary radiant conduit 15 includes a flow portion 22 that extends between the second inlet section 16 of the auxiliary radiant conduit 15 and the junction portion 21 of the section. radiation 19.

Preferably, as shown in Fig. 1, the radiation section 19 of the auxiliary radiant conduit 15 includes a return portion 23 that extends between the junction portion 21 of the radiation section 19 and the second outlet section 17 of the conduit. auxiliary radiant 15.

Advantageously, in relation to the example of Fig. 2, the radiation section 19 develops in a substantially rectilinear manner from the second inlet section 16 to the second outlet section 17 of the auxiliary radiant conduit 15.

Preferably, the auxiliary radiant conduit 15 is located near the radiant conduit 3 .

Advantageously, the direct exchange heat recovery unit 14, located in the indoor environment I, includes one or more ambient air fans (not illustrated in the attached figures) located on the radiation section 19 of the auxiliary radiant duct 15 and close to it, and capable of transporting an air flow taken from the indoor environment I against said radiation stretch 19 in order to increase the thermal exchange between the hot PV carrier fluid that circulates through the auxiliary radiant conduit 15 and the indoor environment I that it should be heated.

Advantageously, the direct exchange heat recovery unit 14, placed in the indoor environment I, includes at least one reflector (not illustrated in the attached figures) located above the radiation section 19 of the auxiliary radiant conduit 15; Said reflector has a reflecting surface directed downwards in order to reflect towards the floor a large part of the thermal radiation emitted by the auxiliary radiant conduit 15.

Preferably, the direct exchange heat recovery unit 14 includes an evacuation chimney 27 connected to the second outlet section 17 of the auxiliary radiant duct 15, which outlet is located in the interior environment I near the wall P or the cover. of the interior environment I.

The evacuation chimney 27 of the direct exchange heat recovery unit 14 has an exhaust opening 18 located in the outdoor environment E and has the purpose of expelling the exhaust fumes FE into the outdoor environment E.

The discovery thus conceived thus achieves the intended objectives.

Claims (13)

1. Radiant duct heating system (1), including: - A closed circuit (2) of radiant conduits, which includes at least one radiant conduit (3) that develops between a first inlet section (4) and a first outlet section (5), is capable of being traversed by a hot carrier fluid (PV), and is suitable to be located in an indoor environment (I) to transfer, by radiation, at least a part of the heat of said carrier fluid (PV) to said indoor environment (I); - a thermal module (6) suitable to be located in an outdoor environment (E) separated from said indoor environment (I) by at least one wall (P), whose thermal module (6) includes: - a burner (7), which is located to intercept said closed circuit (2), which is equipped with a combustion chamber (CC) capable of generating combustion products at high temperature, and which is connected in fluid relation to the first inlet section (4) of said radiant conduit (3) for introducing into said radiant conduit (3) said combustion products capable of forming, at least in part, said carrier fluid (FV); - at least one fan (8), which is located to intercept said closed circuit (2), which has a suction mouth (9) in fluid communication with the first outlet section (5) of said radiant duct (3 ), and with a discharge mouth (10) in fluid communication with said burner (7), and which is prepared to circulate, through said radiant conduit (3), said carrier fluid (FV) in depression; - an expulsion conduit (11), which develops between an inlet part (12), which is connected in fluid relationship with said closed circuit (2) to extract a part of said carrier fluid (FV) to be expelled as exhaust fumes (FE) in said outdoor environment (E), and an outlet part (13); said heating system (1) is characterized by including a direct exchange heat recovery unit (14), which is connected to said exhaust duct (11) and includes at least one auxiliary radiant duct (15), which includes : - a second inlet section (16) connected to the outlet part (13) of said exhaust duct (11) to receive said exhaust fumes (FE); - a second outlet section (17) destined to be in fluid communication with said external environment (E) to expel said exhaust fumes (FE) in said external environment (E), - a radiation section (19) that develops between said second inlet section (16) and said second outlet section (17) and capable of being placed in said interior environment (I) to yield, at least by radiation, to the minus a part of the heat from said exhaust fumes (FE) to said interior environment (I). Heating system (1) according to claim 1, characterized in that said closed circuit (2) includes a pressure section (20) that extends between the discharge mouth (10) of said fan (8) and said burner ( 7), to which pressure section (20) the inlet part (12) of said expulsion conduit (11) is connected. Heating system (1) according to claim 1 or 2, characterized in that said auxiliary radiant duct (15) develops, starting from said second inlet section (16), following said exhaust duct (11). Heating system (1) according to any one of the preceding claims, characterized in that said radiant duct (3) includes a continuous band of metallic material that develops in a spiral forming a substantially tubular body. Heating system (1) according to any one of the preceding claims, characterized in that said auxiliary radiant conduit (15) includes a continuous band of metallic material that develops in a spiral forming a substantially tubular body. Heating system (1) according to any one of the preceding claims, characterized in that the radiation section (19) of said auxiliary radiant conduit (15) includes: - a connection part (21), which develops with a curve substantially 180 °; - a flow part (22) extending between said second inlet section (16) and said splice part (21); - a return part (23) extending between said splice part (21) and said second outlet section (17). Heating system (1) according to any one of the preceding claims, from 1 to 5, characterized in that said radiation section (19) develops in a substantially rectilinear manner from said second inlet section (16) to said second outlet section (17). Heating system (1) according to any one of the preceding claims, characterized in that said auxiliary radiant duct (15) is located near said radiant duct (3). Heating system (1) according to any one of the preceding claims, characterized in that said direct exchange heat recovery unit (14) includes one or more second external fans located on the radiation section (19) of said radiant duct auxiliary (15), and suitable to transport a flow of ambient air against said radiation section (19). Heating system (1) according to any one of the preceding claims, characterized in that said direct exchange heat recovery unit (14) includes at least one reflector placed above the radiation section (19) of said auxiliary radiant duct ( 15) and has a reflecting surface directed downwards to reflect towards the floor part of the radiation emitted by said auxiliary radiant conduit (15). Heating system (1) according to any one of the preceding claims, characterized in that said thermal module (6) includes: - first supply means (24) connected to said burner (7) and prepared to introduce a flow of air (A) into said burner (7); - second supply means (25) connected to said burner (7) and prepared to introduce a gas flow (G) into said burner (7), so that a mixture is formed in said combustion chamber (CC) fuel (C) from said air (A) and from said gas (G); - ignition means (26) that can be operated to generate a combustion of said fuel mixture (C) with the consequent generation of said hot combustion products. 12. Heating system (1) according to any one of the preceding claims, characterized in that said exhaust duct (11) has a coating of heat - insulating material, which is positioned at the least on an exterior portion (11E) of said conduit expulsion (11) destined to be located in said external environment (E). 13. Heating system (1) according to any one of the preceding claims, wherein said heat recovery unit direct exchange (14) includes an exhaust stack (27), which is connected to the second outlet section ( 17) of said auxiliary radiant duct (15) and has an expulsion opening (18) suitable to be placed in said outdoor environment (E) to expel said exhaust fumes (FE) in said outdoor environment (E).