EP3299722B1

EP3299722B1 - A heat accumulating element

Info

Publication number: EP3299722B1
Application number: EP17397521.0A
Authority: EP
Inventors: Atso Raittio
Original assignee: Turun Uunisepat Oy
Current assignee: Turun Uunisepat Oy
Priority date: 2016-09-12
Filing date: 2017-09-08
Publication date: 2019-12-04
Anticipated expiration: 2037-09-08
Also published as: FI20165677A; FI128340B; RU2017131542A; EP3299722A1

Description

Field of the invention

The present invention relates to a heat accumulating element for a fireplace, a heating system comprising a heat accumulating element and a kit for retrofitting a fireplace.

Background

A fireplace i.e. any type of furnace or stove used for heating buildings alternatively heats space and air around it by radiating and/or by preserving the heat in its frameworks. There exists several types of fireplaces, but sometimes, the space of a building for a fireplace is not suitable for a fireplace meeting the requirements set for it or an already existing fireplace is unsuitable or insufficient for heating.
Relevant background art is described in the following publications: SE 519 411 C2 , US 4 478 208 A , WO 96/18854 A1 , WO 2007/058541 A1 .

Summary

Now there has been invented an additional heat accumulating element for a fireplace. The heat accumulating element may be a wall-like structure arranged in the vicinity of the fireplace. Inside the heat accumulating element is arranged a flue gas cavity, and the flue gas cavity is connected to the fireplace so that flue gas produced by the fireplace is arranged to flow through the additional heat accumulating element. When the flue gas flows through the additional heat accumulating element, the heat is emitted from the flue gas to the additional heat accumulating element surrounding the flue gas while it travels through the flue gas cavity of the additional heat accumulating element. In other words, an additional heat accumulating element is arranged between a fireplace and an actual chimney or corresponding means and flue gas is arranged to heat the additional heat accumulating element while it travels through the flue gas cavity of the element before chimney. The invention relates also to a fireplace with a heat accumulating element and a kit for retrofitting a fireplace.
According to a first aspect of the invention, there is provided a heat accumulating element comprising an internal flue gas cavity for flue gas produced by a fireplace, wherein the heat accumulating element is configured to be placed in the vicinity of the fireplace and a chimney and to be connected between the fireplace and the chimney so that flue gas flows from the fireplace to the chimney trough the internal flue gas cavity. The heat accumulating element comprises at least two heat accumulating element modules with internal cavities and which heat accumulating element modules are configured to be fastened one on the other by mortar so that each heat accumulating element module is configured to constitute a part of the uniform heat accumulating element structure. The internal cavities of said heat accumulating element modules are configured to constitute a part of the internal flue gas cavity having a form of a double circulation. The heat accumulating element further comprises a lighting damper.
According to an embodiment, the heat accumulating element modules are made of Olivine stone. According to an embodiment, the internal flue gas cavity having the form of the double circulation comprises a downward cavity part and two upward cavity parts, wherein the downward cavity part is in the center area of the heat accumulating element and upward cavity parts are arranged on both sides of the heat accumulating element and wherein the downward cavity part is arranged to guide the flue gas from the upper part of the heat accumulating element to the lower part of the heat accumulating element and said two upward cavity parts are arranged to guide flue gas back to the upper part of the heat accumulating element before the flue gas is guided to the chimney. According to an embodiment, the heat accumulating element comprises a shell structure, wherein the shell structure is arranged around the heat accumulating element so that there is an air gap between the heat accumulating element and the shell structure. According to an embodiment, the heat accumulating element comprises the lighting damper arranged to prevent flowing of flue gas to the double circulation if the lighting damper is closed.
According to a second aspect of the invention, there is provided a heating system comprising a fireplace, with a chimney and a heat accumulating element, wherein the heat accumulating element is according to a first aspect of the invention. According to an embodiment, the heat accumulating element modules are made of Olivine stone, the internal flue gas cavity having the form of the double circulation comprises a downward cavity part and two upward cavity parts, wherein the downward cavity part is in the center area of the heat accumulating element and upward cavity parts are arranged on both sides of the heat accumulating element and wherein the downward cavity part is arranged to guide the flue gas from the upper part of the heat accumulating element to the lower part of the heat accumulating element and said two upward cavity parts are arranged to guide flue gas back to the upper part of the heat accumulating element before the flue gas is guided to the chimney, the heat accumulating element comprises a shell structure, wherein the shell structure is arranged around the heat accumulating element so that there is an air gap between the heat accumulating element and the shell structure or the heat accumulating element comprises the lighting damper arranged to prevent flowing of flue gas to the double circulation if the lighting damper is closed.
According to an embodiment, the heat accumulating element is arranged behind the fireplace and in front of the chimney. According to an embodiment, the heat accumulating element is arranged behind the fireplace and the chimney is arranged on the heat accumulating element. According to an embodiment, the heat accumulating element is arranged behind the fireplace and the chimney is arranged on the fireplace. According to an embodiment, the heat accumulating element is arranged next to the fireplace.
According to a third aspect of the invention, there is provided a kit for retrofitting a fireplace with a chimney comprising a heat accumulating element, wherein the heat accumulating element is wherein the heat accumulating element is according to a first aspect of the invention. According to an embodiment, the heat accumulating element modules are made of Olivine stone, the internal flue gas cavity having the form of the double circulation comprises a downward cavity part and two upward cavity parts, wherein the downward cavity part is in the center area of the heat accumulating element and upward cavity parts are arranged on both sides of the heat accumulating element and wherein the downward cavity part is arranged to guide the flue gas from the upper part of the heat accumulating element to the lower part of the heat accumulating element and said two upward cavity parts are arranged to guide flue gas back to the upper part of the heat accumulating element before the flue gas is guided to the chimney, the heat accumulating element comprises a shell structure, wherein the shell structure is arranged around the heat accumulating element so that there is an air gap between the heat accumulating element and the shell structure or the heat accumulating element comprises the lighting damper arranged to prevent flowing of flue gas to the double circulation if the lighting damper is closed.

Description of the Drawings

In the following, various embodiments of the invention will be described in more detail with reference to the appended drawings, in which

Fig. 1: shows a heating system according to an embodiment of the invention;
Fig. 2: shows a horizontal cross-section through the heating system, taken along the line A-A in fig. 1;
Fig. 3: shows a vertical cross-section through the heat accumulating element, taken along the line B-B in fig. 2;
Fig. 4: shows a vertical cross-section through the heat accumulating element, taken along the line B-B in fig. 2;
Fig. 5: shows a heating system according to an embodiment of the invention;
Fig. 6: shows a heating system according to an embodiment of the invention;
Fig. 7: shows a heating system according to an embodiment of the invention;
Fig. 8a, b: show a vertical cross-section through a heat accumulating element without a shell structure according to an embodiment of the invention,
Fig. 8c-f: show a horizontal cross-section of a heat accumulating modules according to an embodiment of the invention,
Fig. 9: shows a vertical cross-section through a heat accumulating element without a shell structure; and
Fig. 10a-d: show an ignition damping element module according to an embodiment of the invention.

Description of Example Embodiments

The term fireplace refers in this context to any type of furnace and stove used for heating houses or other buildings or spaces. The fireplace may alternatively heat space/air around it by radiating and/or by preserving the heat generated by the fire into its frameworks. Heat reserving, however, is a needed or at least preferable feature in cold conditions, or under conditions where continuous heating is not possible. However, all types of fireplaces do not even have suitable framework or their framework is not large enough to reserve sufficient amount of heat.
However, by an additional heat accumulating element for a fireplace the heat reserving abilities can be improved. The heat accumulating element is formed of element modules made of olivine stone mass and having a profile comprising a part of a flue gas cavity. Element modules are configured to be fastened one on the other in the vertical direction as a pile, for example, by mortar or by some other suitable adhesive so that each element module constitutes a part of the uniform heat accumulating element. In other words, element modules are connected i.e. fixed one on the other to build the complete heat accumulating element. When modules are arranged as a pile their flue gas cavity parts form together the flue gas cavity having a shape of a double circulation cavity. The heat accumulating element comprises several or at least one heat accumulating element module, an ignition damping element module comprising a lighting damper and a base module for combining two vertical parts of the flue gas cavity. A fireplace may be any type of fireplace, but an additional heat accumulating element may be especially valuable, for example, for a stove, for example, a wood-burning stove or corresponding used for heating and comprising a solid sheet metal, usually cast iron or steel, framework. The additional heat accumulating element may be a wall-like structure comprising an internal flue gas cavity i.e. a flue gas duct acting as a path for flue gas to go through the element. However, the shape of the element is not restricted to shown embodiments.
The additional heat accumulating element may be formed from stone elements that are arranged as a vertical pile, one on the other, as above already mentioned. The additional heat accumulating element may be arranged in the vicinity of the fireplace, for example behind or next the fireplace. Suitable place may depend, for example, on the location of chimney and flue gas output connection of the fireplace. For example, if a fireplace is against a wall, it is advantageous to arrange an additional heat accumulating element next to the fireplace, for example, also against the wall. The flue gas path of the element may be connected to the flue gas output connection of the fireplace so that flue gas produced by the fireplace is arranged to flow through the flue gas path of the additional heat accumulating element and further out of the element to the chimney. The flue gas output connection may be arranged on top of the fireplace, to the upper part of the back side or a side of the fireplace. When the flue gas flows through the additional heat accumulating element, the heat is emitted from the flue gas to the heat accumulating element surrounding the flue gas while it travels through the flue gas path of the heat accumulating element. In other words, an additional heat accumulating element is arranged and connected between a fireplace and an actual chimney or corresponding means and flue gas is arranged to heat the additional heat accumulating element while it travels through the flue gas path of the element between the fireplace and the chimney.
The flue gas path has a shape that is a so called double circulation system, which is a system where hot flue gases circulate longer in the flue gas path. In the double circulation system, the flue gas that is guided to the center area of the upper part of the element from the fireplace is forced downwards until the lower part of the element before it is turned upwards to flow out from the upper part of the element to the chimney. There may be two paths for upflowing flue gas, on both sides of the element. The flue gas guiding inside the element is arranged by forming cavities to modules of the heat accumulating element beforehand. The connection between the element and the chimney may be arranged, for example, to the upper part of the element or on top of the element. This double circulation system may help to achieve the best possible heating that is economic and decreases the emissions to a minimum. In addition, due to the double circulation flue gas cavity flowing widely inside the element the heat accumulating element warms uniformly.
The heat accumulating element may be made of Olivine stone or material comprising Olivine stone. Olivine stone is very heavy stone and, thus, is capable of preserving heat better than other stone or materials. And when it comes to the outer side i.e. the visible side, one can choose either glazed tile, tile, clinker or stone tile to be put in place or the outer side may also be plastered. The heat accumulating element may comprise, for example, 600 to 700kg reserving stone. However, the mass may be smaller or larger if smaller or bigger reserving capacity is needed, for example, 300kg, 800kg or even more or less. In addition, because the Olivine stone is so heavy stone, the heat accumulating element requires only little space, which means that the heat accumulating element is a compact structure. Therefore, the thin heat accumulating element may be arranged between a fireplace and a wall of a house or corresponding.
The structure of the heat accumulating element is such that it is easy to raise or lower on the basis of flue gas output connection of a fire place. In addition, structure of a heat accumulating element is so small and/or adaptable that it is possible to build a heat accumulating element behind or next to an already existing fireplace i.e. the element is also retrofittable. However, instead of adjusting the height of a heat accumulating element on the basis of a flue gas output connection of a fire place, the heat accumulating element comprises an ignition damping element module. The ignition damping element module is an element comprising a lighting damper. The lighting damper of the ignition damping element module works similarly as the separate lighting damper, which will be described in the following paragraph. The ignition damping element module is arranged to be located in the heat accumulation module pile comprising several heat accumulation modules one on the other. The ignition damping element module may be the topmost module in the pile or there may be one or more heat accumulation modules arranged above the ignition damping element module. Place of the ignition damping element module in the module pile is selected on the basis of the flue gas output connection of a fire place. The ignition damping element module is arranged to be located, in the vertical direction, above the flue gas output connection, but under the chimney connector enabling flowing of flue gas from the heat accumulating element to the chimney. Because the ignition damping element module is possible to be located in any height in the heat accumulation module pile, the heat accumulation element comprising the ignition damping element module with a lighting damper instead of a regular lighting damper is more adjustable and suitable to be used with almost every existing fire place i.e. the height of the flue gas output connection may vary. Due to the ignition damping element module, the heat accumulation element does not need to be custom-made for every fire place, but the heat accumulation element may be assembled at the work site. This may save costs. Furthermore, there is no need to reduce the mass of double circulation structure or the size of the double circulation cavity even if the flue gas output connection is in the lower part of a fire place. Previously, when the ignition damping element module was not used, this was the case. And reduction of the total mass of the heat accumulation element and/or size of the double circulation cavity may reduce the heat accumulating efficiency.In addition, a heat accumulating element comprises a lighting damper i.e. a by-pass damper that is a movable iron plate that regulates flue gas flow. The damper is arranged to be open when lighting a fire in the fireplace. When the damper is open, the flue gas may flow directly from the fireplace to the chimney without flowing through the flue gas path of the heat accumulating element. Whereas when the damper is closed, the flue gas flows through the flue gas path of the heat accumulating element before flowing to the chimney. The damper may be arranged in the upper part of the element, for example, in connection with the chimney connection. The damper eases lighting of fire into the fireplace. The lighting damper enables by-passing of the heat accumulating element also in other circumstances than when lighting a fire in the fireplace. By-passing of the heat accumulating element may be preferable, for example, in summer conditions or in other situations where the fireplace is wanted to be used without accumulating the heat to the heat accumulating element.
A heat accumulating element also comprises a shell structure that is arranged around a heat accumulating element. It is also possible that a heat accumulating element is formed inside a shell structure, where one side of it is open for forming the heat accumulating element and the open side is finished after the heat accumulating element is ready. There is an air gap between the shell structure and the heat accumulating element. The air gap enables more uniform warming for this shell structure, because the heated heat accumulating element heats the air in the air gap. The heated air is able to move in the air gap; therefore, when heated air further heats the shell structure, the shell structure is heated uniformly, without hotspots. Therefore, burning incidents or other problems resulting from the hotspots may be better avoided. The shell structure may also be formed form shell elements that are fastened to each other, for example, by suitable mortar. The shell structure is formed around the heat accumulating element in connection with forming of the element.
It is also possible that a heat accumulating element with a shell structure is coated by outer plate cover comprising glazed tiles, tiles, stone plates or clinkers. A heat accumulating element may also be plastered. The shell structure of the heat accumulating element is coatable as such.
In the following, several embodiments of the invention will be described in the context of figures 1 to 7.
Figure 1 shows a heating system 100 according to an embodiment of the invention. The heating system 100 comprises a fireplace 101, a heat accumulating element 102, and a chimney 103. The heat accumulating element 102 is between the fireplace 101 and the chimney 103. When seen from the front the heat accumulating element 102 is behind the fireplace 101 and in front of the chimney 103. The heat accumulating element 102 is connected to the fireplace 101 by a fireplace connector 104 enabling flowing of flue gas through the connector 104 from the fireplace 101 to the heat accumulating element 102. Further the heat accumulating element 102 is connected to the chimney 103 by a chimney connector 105 enabling flowing of flue gas through the connector 105 from the heat accumulating element 102 to the chimney 103.
Further is disclosed a lighting damper 106 in the heat accumulating element 102. The purpose of the lighting damper 106 is to prevent double circulation of flue gas inside the heat accumulating element 102 during the lighting of fire in the fireplace 101; in this case the damper 106 is open. When the lighting damper 106 is closed, the double circulation of flue gas inside the heat accumulating element 102 is in use. In other words, direct route from the fireplace 101 to the chimney 103 is closed, and the flue gas is forced to circulate through double circulation cavity for flue gas inside the heat accumulating element 102. In addition, there is shown a fireplace damper 107a in the chimney 103, which is arranged to be open and allow flue gas to rise while the fireplace 101 is in use. However, it is also possible to arrange a fireplace damper 107b in connection with the chimney connector 105 instead of the fireplace damper 107a in the chimney 103.
Connectors 104, 105 and dampers 106, 107a, 107b are indicated by dashed line, because they are non-visible parts of the system 100.
Further, soot hatches 108, 109 of the heat accumulating element 102 and the chimney 103 are shown.
Figure 2 shows a horizontal cross-section through the heating system 100, taken along the line A-A in fig. 1. In this figure, the internal double circulation system i.e. the internal double circulation cavity inside the heat accumulating element 102 is shown. The fireplace connector 104 forming connection for flue gas from a fireplace to the element 102 is arranged to the upper part of the element 102. The double circulation cavity of the heat accumulating element 102 comprises at least one vertical downward cavity part 108 and at least two vertical upward cavity parts 109. The downward cavity part 108 is arranged in the center area of the element 102 and vertical upward cavity parts 109 are arranged on both sides of the vertical downward cavity part 108. In the downward cavity 108 the flue gas is directed from the fireplace through the fireplace connector 104 and the flue gas flows downwards. From the vertical downward cavity part 108 flue gas is guided to upward cavity parts 109 and the flue gas is possibly divided into two parts.
Also an opening inside the chimney 103 is shown.
Figure 3 shows a vertical cross-section through the heat accumulating element 102, taken along the line B-B in figure 2. From this view, a structure of the heat accumulating element 101 is shown more clearly. The heat accumulating element 102 and a shell structure 111 are made of modules that are fastened one on the other, for example, by mortar. Further, there is disclosed an air gap 112 between the heat accumulating element modules 110 of the heat accumulating element 102 and the modular shell structure 111. In this embodiment, the lighting damper 106 is closed and a double circulation cavity route of flue gas 113 inside the heat accumulating element 102 is shown more illustratively.
Figure 4 shows a vertical cross-section through the heat accumulating element, taken along the line B-B in figure 2. Figure 4 corresponds figure 3, except that in this embodiment the lighting damper 106 is open and flue gas 113 flows through a direct route from fireplace connector 104 to the chimney connector 105, not inside the heat accumulating element 102.
It should be noted that the heat accumulating element 102 may comprise the shell structure 111 or not and that the structure of the heat accumulating element 102 may also be made of bricks instead of element modules. In addition, there is shown an alternative location 114 for the chimney connector 105 by dashed line in figures 3 and 4.
Figure 5 shows a side view of a heating system 200 according to an embodiment of the invention. In this embodiment, a chimney 203 is arranged above a heat accumulating element 202 and this structure is arranged behind a fireplace 201. Places of connectors are shown by dashed line.
Figure 6 shows a side view of a heating system 300 according to an embodiment of the invention. In this embodiment, a chimney 303 is arranged above/on a fireplace 301 and a heat accumulating element 302 is arranged behind the fireplace 301 and the chimney 303 structure. Places of connectors are shown by dashed line.
Figure 7 shows a front view of a heating system 400 according to an embodiment of the invention. In this embodiment, a heat accumulating element 402 is arranged next to a fireplace 301. A chimney 403 may be arranged behind the fireplace 401 or on the fireplace 401. Places of connectors are shown by dashed line. This embodiment may be an example of a situation where the heat accumulating element 402 is arranged afterwards to the heating system.
Figure 8a and 8b show a vertical cross-section through a heat accumulating element 800 without a shell structure according to an embodiment of the invention. The heat accumulating element 800 of figure 8a comprises an ignition damping element module 803, heat accumulation modules 801 and a base module 802. Modules are fastened one on the other as a pile. In this embodiment, the ignition damping element module 803 is the topmost module in the pile and arranged on the other modules. The base module 802 is the bottom module. The ignition damping element module 803 comprises a lighting damper 806. In this embodiment, the lighting damper 806 is closed and a double circulation cavity route of flue gas 807 inside the heat accumulating element 800 is shown. The double circulation cavity begins from a fireplace connector 804 through which flue gas flows from a fireplace to the heat accumulating element 800. From the double circulation cavity, flue gas flows to a chimney through a chimney connector 805. The double circulation cavity comprises at least one vertical downward cavity part i.e. flue gas flows downwards and at least two vertical upward cavity parts i.e. flue gas flows upwards. The base module 802 connects the at least one vertical downward cavity part to the at least two vertical upward cavity parts so that the flue gas can flow from the at least one vertical downward cavity part to the at least two vertical upward cavity parts. The ignition damping element module 803 is arranged between the fireplace connector 804 and the chimney connector 805 in a vertical direction. When the lighting damper 806 is open flue gas 807 will flow from the fireplace connector 804 to the chimney connector 805, without flowing through the double circulation cavity.
Modules horizontal cross-sections are shown in figure 8c-e. The horizontal cross-section of the ignition damping element module 803 in figure 8c comprises one downward cavity opening X and two upward cavity openings Y and the damper 806. The horizontal cross-section of the heat accumulation module 801 of figure 8d comprises also one downward cavity opening X and two upward cavity openings Y. However, the area of the downward cavity opening X of the ignition damping element module 803 is smaller than the area of the downward cavity opening X of the heat accumulation module 801 so that the lighting damper 806 can be used for closing the opening X, but also so that it can be moved aside off the opening X. The horizontal cross-section of the base module 802 in figure 8e may have one unitary opening Z when seen above.
The heat accumulating element 800 of figure 8b also comprises an ignition damping element module 803, several heat accumulation modules 801 and a base module 802, which are fastened one on the other as a pile. In this embodiment, the ignition damping element module 803 is arranged in the middle of the pile i.e. in other words between the heat accumulation modules 801 so that there are heat accumulation modules 801 below and under the ignition damping element module 803. The base module 802 is the bottom module of the pile. The ignition damping element module 803 comprises a lighting damper 806. In this embodiment, the lighting damper 806 is closed and a double circulation cavity of flue gas 807 inside the heat accumulating element 800 is shown. The double circulation cavity of flue gas 807 begins from a fireplace connector 804 through which flue gas flows from a fireplace to the heat accumulating element 800. The double circulation cavity continues through the heat accumulation modules 801 that are arranged below and above the ignition damping element module 803. The base module 802 connects the at least one vertical downward cavity part to the at least two vertical upward cavity parts so that the flue gas can flow from the at least one vertical downward cavity part to the at least two vertical upward cavity parts. From the double circulation cavity, flue gas flows to a chimney through a chimney connector 805. The ignition damping element module 803 is arranged between the fireplace connector 804 and the chimney connector 805 in a vertical direction.
A possible horizontal cross-section of the heat accumulation modules 810 arranged on the ignition damping element module 803 is shown in figure 8f. The horizontal cross-section of the heat accumulation module 810 above the ignition damping element module 803 comprises a cavity opening M and at least two cavity openings Y, wherein inside each opening, Y and M, the flue gas flows upwards. and the horizontal cross-section of the heat accumulation module 810 may correspond the horizontal cross-section of the heat accumulation module 801a shown in figure 8a, but the direction of the flue gas inside cavities of Y and M is different. Flue gas will flow inside cavity M of modules 810, when the lighting damper 806 is open. The route of the flue gas flow 811 inside the accumulation modules 810 above the ignition damping element module 803, in a case of open lighting damper 806, is shown by dashed line.
Figure 9 shows a vertical cross-section through a heat accumulating element 900 in an example not according to the invention, and without a shell structure. This figure shows a separate lighting damper 906, which is not a part of an ignition damping element module. The lighting damper 906 is arranged above heat accumulation modules 910. One or more heat accumulation modules 910 are not arranged on the lighting damper 906, because the lighting damper 906 will not move if there is one or more heat accumulation module 910 on it. Therefore, if the separate lighting damper 906 is used, the mass and height of the heat accumulating element 900 depends on the height of the fireplace connector 904 of the heat accumulating element 900.
Figures 10a-c show an ignition damping element module according to an embodiment of the invention. Figure 10a shows an ignition damping element module 950 from above. Also a place for a lighting damper 951 is shown. Figure 10b shows a side view of the ignition damping element module 950. As can be seen, the place for the lighting damper 951 is at the lower level than the area surrounding the place 951. In other words, the lighting damper is arranged to be movable embedded to the surface of the ignition damping element module 950. Figure 10c shows the ignition damping element module 950 from above. Also the place for the lighting damper 951 is shown as well as the lighting damper 952 in its place 950. In this figure the lighting damper 952 is in a closed position. In the closed position the lighting damper 952 closes a double circulation cavity so that flue gas will not flow to the double circulation cavity but directly to the chimney. Figure 10d shows the ignition damping element module 950 from above. In this figure the lighting damper 952 is in an open position. In the open position the lighting damper 952 is moved aside so that the double circulation cavity is open and flue gas will flow to the double circulation cavity and through the double circulation cavity to the chimney. The ignition damping element module 950 made of olivine stone mass and it is an iron reinforced olivine stone structure.
The size i.e. cross-section dimensions of cavity parts of double circulation system may also effect to the heat accumulating efficiency of the heat accumulating element. However, due to the mass of the heat accumulating element and the double circulation system the heat accumulating element may capture even 80% of the waste heat that will otherwise travel out through the chimney.
However, also in the above mentioned embodiments, a heat accumulating element may be arranged to the heating system afterwards i.e. the heat accumulating element is a kit for retrofitting a fireplace with a chimney.

Claims

A heat accumulating element (800) for fireplaces with a different flue gas output connection (804) height, wherein the heat accumulating element (800) comprising an internal flue gas cavity (108, 109) for flue gas (807) produced by a fireplace (101) is configured to be connected between a fireplace (101) and a chimney (103) so that flue gas (807) flows from the fireplace (101) to the chimney (103) through the heat accumulating element (800), and wherein the heat accumulating element (800) comprises at least two heat accumulating element modules (801) with internal flue gas cavities (108, 109) and a base module (802) for combining two vertical parts of the flue gas cavity (108, 109) as the bottom element of the heat accumulating element (800), wherein the heat accumulating element (800) further comprises an ignition damping element module (803) comprising a lighting damper (806) and internal flue gas cavities and that modules (801, 802, 803) are configured to be fastened one on the other as a pile by mortar so that each module (801, 802, 803) constitutes a part of the uniform heat accumulating element (800) and so that internal flue gas cavities (108, 109) of said modules (801, 802, 803) constitute a part of the internal flue gas cavity having a form of a double circulation continuing through each module, and that when the lighting damper (806) is open, the flue gas is arranged to flow directly from the fireplace (101) to the chimney (103) and when closed, the flue gas (807) is arranged to flow through the flue gas cavity (108, 109) before flowing to the chimney (103), and that a place of the ignition damping element module in the pile is selectable on the basis of the height of the flue gas output connection (804), but above the flue gas output connection (804).
The heat accumulating element (800) according to claim 1, wherein the ignition damping element module is iron reinforced.
The heat accumulating element (800) according to claim 1 or 2, wherein the lighting damper (806) is movable embedded to the surface of the ignition damping element module (803).
The heat accumulating element (800) according to any of claims 1 to 3, wherein the heat accumulating element modules are made of Olivine stone.
The heat accumulating element (800) according to any of claims 1 to 4, wherein the internal flue gas cavity (108, 109) comprises a downward cavity part (108) and two upward cavity parts (109), wherein the downward cavity part (108) is in the center area of the heat accumulating element (800) and upward cavity parts (109) are arranged on both sides of the heat accumulating element (800) and wherein the downward cavity part (108) is arranged to guide the flue gas from the upper part of the heat accumulating element (800) to the lower part of the heat accumulating element (800) and said two upward cavity parts (109) are arranged to guide flue gas (807) back to the upper part of the heat accumulating element (800) before the flue gas (807) is guided to the chimney (103).
The heat accumulating element (800) according to any of claims 1 to 5, wherein the heat accumulating element (800) comprises a shell structure arranged around the heat accumulating element (800) so that there is an air gap between the heat accumulating element (800) and the shell structure.
A heating system comprising a fireplace (101), a chimney (103) and a heat accumulating element (800), wherein the heat accumulating element (800) is according to any of the claims 1 to 6.
A heating system according to claim 7, wherein the heat accumulating element (800) is arranged behind the fireplace (101) and in front of the chimney (103).
A heating system according to claim 7, wherein the heat accumulating element (800) is arranged behind the fireplace (101) and the chimney (103) is arranged on the heat accumulating element (800).
A heating system according to claim 7, wherein the heat accumulating element (800) is arranged behind the fireplace (101) and the chimney (103) is arranged on the fireplace (101).
A heating system according to claim 7, wherein the heat accumulating element (800) is arranged next to the fireplace (101).