EP0845640B1 - Cylindrical heating installation with helical heat exchanger - Google Patents

Description

The invention relates to a device for Heating hot water and sanitary water with one cylindrical structure, a helical hot water heat exchanger which comprises a cylindrical space, where a combustion chamber is located in the room, and a sanitary water heat exchanger.

EP-A-0 570 201 describes such a device with a Hot water heat exchanger made from a helical Line is set up. Within the pipe of the hot water heat exchanger a sanitary water pipe is attached coaxially to form a sanitary water heat exchanger.

New investigations have to do this led that in oil or gas fired devices in near the flame a smooth pipe to lower the Reaction temperatures is used, making the Nitric oxide emissions without an increase in Carbon monoxide emissions can be reduced. Moreover lead to smaller available installation dimensions smaller device volumes, and there is one Demand for a modular system to reduce the Number of different types of parts and spare parts.

The invention intends a compact, according to the Modular heating device create.

This task is accomplished by a device with the Features of claim 1 solved.

The heating device according to the invention has by the integration of a sanitary water heat exchanger in the Flue gas discharge duct of the hot water heat exchanger Advantage of a very compact structure. You also get a very wide performance range, which leads to cheap Way of reducing the number of types. Due to the interchangeability of the flue gas duct of the Hot water heat exchanger creates the possibility of a condensing heater, a non-condensing Heater without a fireplace or one on to build a chimney-bound heater.

The water-carrying components are preferably in a plug-in technology to simplify assembly executed. The housing is cheap simply built from sheet steel, making electronic Circuits protected against the ingress of dust and water can be accommodated.

In a favorable embodiment, the Heating unit the following parts: an atmospheric Gas burner, a hot water heat exchanger with one integrated, upstream combustion chamber and one downstream flue gas discharge, a cylindrical Housing, a base body with an integrated Sanitary water heat exchanger, means for the supply of Air and means for the supply of hot water and Sanitary water in a pluggable version.

The heating unit has within the flue gas discharge of the hot water transmitter an integrated sanitary water heat exchanger. The whole Heating unit is cylindrical with a central arranged cylindrical burner by a spiral is surrounded by a smooth tube. Behind - or with vertical Structure under - the burner is the sanitary water heat exchanger attached within a housing so that the water in it even with heating operation the associated comfort is kept warm.

In a preferred embodiment, the whole Outside air flows around the heating unit in a housing. The layered structure gives you one from the inside temperature gradients sinking to the outside, whereby Heat losses can be avoided to a high degree and high Operational safety with regard to gas leaks is created.

A 2- or 3-stage hot water heat exchanger is suitable, its first stage from a smooth tube with closely spaced coils to accommodate Radiant heat consists, and the second stage of one finned tube to absorb the convection heat Combustion gases exist. The connections of the hot water heat exchanger are pluggable in the mounting direction designed to ensure easy assembly. This means that the hot water heat exchanger can also be used by the end user with different number of turns of finned tube to adjust the power that Flue gas temperature, etc. can be replaced.

A mounting plate for the burner can be designed in this way be that with no changes burner different diameters and lengths can be installed can.

Figur 1 schematisch die geschlossene Heizungsvorrichtung ohne Mantel zeigt;

Figur 2 eine Darstellung der Heizungseinheit der Heizungsvorrichtung nach Figur 1 in zerlegter Form zeigt;

Figur 3 einen Querschnitt durch die Heizungseinheit zeigt;

Figur 3a Strömungsmuster in einem in vergrößertem Maßstab dargestellten Querschnitt einer Ausführungsform eines Sanitärwasser-Wärmeübertragers zeigt; und

Figur 3b Strömungsmuster in einem in vergrößertem Maßstab dargestellten Querschnitt einer anderen Ausführungsform eines Sanitärwasser-Wärmeübertragers zeigt.

The invention is explained in more detail below with reference to a drawing, in which exemplary embodiments of a heating device are shown, in which:

Figure 1 shows schematically the closed heating device without a jacket;

FIG. 2 shows an illustration of the heating unit of the heating device according to FIG. 1 in a disassembled form;

Figure 3 shows a cross section through the heating unit;

FIG. 3a shows flow patterns in an enlarged cross section of an embodiment of a sanitary water heat exchanger; and

FIG. 3b shows flow patterns in an enlarged cross section of another embodiment of a sanitary water heat exchanger.

In the different figures denote the same Identical parts or parts with the same reference numerals Function.

In Figure 1, a heating device 1 is shown with a heating unit 21, a control unit 22, one hydraulic unit 23, a connection unit 24 and a storage unit 12 attached to the heating side. A flue gas discharge and air supply connection 25 is connected to the Cover of the heating unit 21 connected and can be modular against connections of different diameters and separate air / flue gas connections to be replaced.

The bottom surface 26 of the unit remains with the different types of heating device always the same, the depth 27 being due to installation in front of a wall or a suspension on a wall is coordinated, preferably is less than 280 mm.

The control unit 22 is on the front Insertable guide rails. The ones directed to the front Operating and display elements are either with a Baffle connected or in a separate unit brought together, directly or via a cable is plugged in connected to a basic control unit.

In Figure 2 are the individual functional units the heating unit shown in disassembled form. A Base plate 31 comprises a flue gas duct 40, one Flue gas connection 41 and a housing 42 of a sanitary water heat exchanger 30th

The sanitary water heat exchanger 30 comprises one Heat exchanger coil 43, a flange 44 with a integrated flow guide and connections 45 for Heating and sanitary water. The sanitary water heat exchanger 30 is in the housing 42 of the Bottom plugged in and with one not shown 0-ring sealed and in a not shown mounting bracket fixed. The connections 45 are preferably designed as a plug-in system.

A helical hot water heat exchanger 32 consists of a smooth tube 46, one with no closer Ribs shown tube 47 and a so connected pipe fitting 48 with a Hot water supply connector 49, where hot water in the Heat exchanger 32 flows, and a hot water discharge connector 50 where hot water from the Heat exchanger 32 flows. In addition, there is one Drain plug connection 50 connected connecting pipe 33 shown on the heater side to connect in to create the same height with the feed connector 49. The smooth tube 46 serves to absorb the radiant heat and guiding the flue gases while the finned pipe 47 serves to absorb the convection heat.

The outer wall of the heating unit 21 consists of a Double cylinder 34 with an inner cylinder 51, one Insulation 52 and, if not installed in a housing takes place, an outer cylinder 53 for mechanical protection the insulation.

To use the heat from the hot combustion chamber a lid 36 is preferably water-cooled, though alternatively, passive heat insulation is also used can be. A view window 54 is on the cover 36 Fasteners, a bushing 55 for the Feed connector, a flange 56 for attaching the Brenner and a ventilation unit 37 as well Mounting rails 57 for the installation of the device appropriate.

A burner 35 to be attached to the cover 36 is executed as one part and offers many geometrically Variation options in terms of diameter, length, Material, etc.

The ventilation unit 37 is functional with the Suction piece 58 and a fan 59 with it connected motor 60 assembled.

The fan 59 is gastight, so that a Supply of the gas to be burned in front of the fan can take place, resulting in low pollutant emissions leads.

As sealing elements within the heating unit 21 0-rings are preferred. The assembly takes place by construction on the base plate 31 instead. Under One gets retention of the assemblies Length variation of the combustion chamber with the Hot water heat exchanger 32 and the double cylinder 34 with the insulation 52, with a variable transmission power the same assembly order.

3 shows a cross section of the heating unit 21 shown. The illustration shows those in FIG 2 modules shown. The burner 35 is in one Combustion chamber 67 provided, which burner 35 with a Seal 66 against the environment and the fan 59 is sealed. The burner 35 is switched on by the fan 59 a premixed, homogeneous gas / air mixture is supplied. The air is drawn in by the fan from the surroundings. The gas is not described in any more detail Device using the generated by the fan Negative pressure mixed with the air.

The combustion chamber 67 is concentric of a smooth one Tube 46 of the helical hot water heat exchanger 32 surrounded. The smooth tube is for Minimize the passage of smoke between the smooth tube 46 and the double cylinder 34 as far as possible wrapped without space. The smooth tube 46 goes into that with increasing rib height finned tube 47 over that in the outflowing gases and goes back into it with decreasing rib height Pipe fitting 48 over. The feed connector 49 is with a suitable seal from the Flue gas duct 40 guided, the seal is not shown.

The sanitary water heat exchanger 30 is on the Flange 44 inserted into the base plate 31. The Sanitary water heat exchanger 30 can be single or multiple be wound from smooth tube or ribbed tube. For the sanitary water comfort is an integrated Energy buffer volume 65 on the heating side advantageous. The attached for the supply and supply of sanitary water Connections 61 and 62 and the one behind the other Connections 63 and 64 for the discharge or supply of hot water run parallel down.

Figures 3a and 3b represent in thin or arrows depicting the thick lines Liquid flow directions of sanitary water or Hot water within the sanitary water heat exchanger 30 represents.

In Figure 3a flows through a three-way valve, not shown Hot water through connection 64 through one to protruding into the sanitary water heat exchanger 30 above Pipe in the sanitary water heat exchanger 30. The Hot water washes around a double smooth one Heat exchanger coil 43 and leaves the sanitary water heat exchanger at the bottom through a pipe over the Connection 63. The sanitary water flows through connection 62 through the outer turns of the heat exchanger spiral 43 up and then through the inside Turns of the heat exchanger spiral 43 down and leaves the sanitary water heat exchanger 30 through the Connection 61.

In Figure 3b flows through a three-way valve, not shown Hot water basically the same way Way in Figure 3a in the sanitary water heat exchanger 30. The heat exchanger spiral 43 is in Figure 3b in essentially run as a finned tube through which the sanitary water via connection 62 upwards and then over a straight, smooth pipe in the central part of the sanitary water heat exchanger 30 after flows down to the discharge port 61.

In operation, the radiant energy of the burner 35 directly onto the smooth spiral of the hot water heat exchanger 32 transferred, the training with a small burner surface and a large cooling surface the spiral of the smooth pipe in connection with one short burnout path has a beneficial effect on the Available power control range and the Has nitrogen oxide emissions. That under the burner 35 attached cylindrical housing 42 of the sanitary water heat exchanger 30 also acts as Displacement body for the ribbed tube 47 and as Heat exchanger for part of the thermal energy from the Combustion chamber for energy buffer volume 65 Heat exchanger spiral 43 receives hot water around therefore thermal energy from the flue gases via the heating in the tubes 46 and 47 and over the housing 42, which Transfer heat energy to the heat exchanger coil 43 becomes. The cross section of Figure 3 shows the Volume reduction of the whole unit through the Integration of sanitary water treatment.

The double cylinder 34 is multi-walled. The Outer cylinder 53 can be omitted if the insulation 52 is sufficiently firm.

Claims (9)

1. Apparatus for heating hot water and sanitary water with a cylindrical structure, a helical hot-water heat-exchanger (32) surrounding a cylindrical chamber, a combustion chamber (67), the combustion chamber (67) being situated in the chamber, and a sanitary water heat-exchanger (30), characterised in that the sanitary water heat-exchanger (30) is disposed substantially concentrically in the chamber.
2. Apparatus according to claim 1, characterised in that the sanitary water heat-exchanger (30) is constructed in the form of a heat-exchanger spiral (43) in a cylindrical housing (42).
3. Apparatus according to claim 2, characterised in that an energy buffer volume (65) is provided inside the heat-exchanger spiral (43) of the sanitary water heat-exchanger (30).
4. Apparatus according to any one or claims 1 to 3, characterised in that the combustion chamber (67) of the apparatus is formed by a closely wound smooth tube (46) of the hot-water heat-exchanger (32), said tube (46) merging into a finned tube (47) in the flue gas discharge direction.
5. Apparatus according to claim 4, characterised in that the apparatus comprises a burner (35) and in that the burner (35) is disposed concentrically in the region of the smooth tube (46) of the combustion chamber (67).
6. Apparatus according to any one of claims 1 to 5, characterised in that the helical hot-water heat-exchanger (32) is surrounded by a cylinder (51) which is surrounded by an insulation (52).
7. Apparatus according to claim 6, characterised in that the insulation (52) is surrounded by a cylinder (53).
8. Apparatus according to any one of claims 1 to 7, characterised in that the water-carrying components are interconnected by push-in connections.
9. Apparatus according to any one of claims 1 to 8, characterised in that it is constructed on the prefabricated component assembly system.

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