DE202012001555U1 - DHW combi cylinder - Google Patents

Abstract

Domestic hot water combination storage tank for the provision of both heated drinking water and heating water, with
an outer vessel (12) filled with heating water during operation, each having a forward (42) and a return (40) for the removal or supply of heating water;
and an inner vessel (14), filled with drinking water during operation and arranged inside the outer vessel (12), each having an inlet (16) and an outlet (18) for the supply and removal of drinking water;
wherein a guide tube surrounding the inner vessel (14) within the outer vessel, or one or more guide tubes (24) are disposed inside the inner vessel (14) extending generally from bottom to top and into the upper third of the outer vessel (12), and a supply (28) for heated heating water to the guide tube or the guide tubes (24) in the lower third of the outer vessel (12) is arranged.

Description

The invention relates to a domestic hot water combined storage tank for the provision of both heated drinking (or bath or laundry) as well as heating water.

Generic domestic water combined storage are z. B. from the inventor's earlier patent application, EP 2 031 333 A2 , known. To support the temperature stratification forming in stored water, there has been proposed a membrane which defines two superimposed communication chambers. In the upper of the chambers, a heat exchanger in the form of a double helix for process water (ie drinking water eg for sanitary purposes) is provided. The supply of heated by a burner or the like heating water takes place at the height of this heat exchanger, the return of the heating water to the burner from the lower chamber. There is also arranged the return of heating consumers.

Systems of the type described herein have a first, closed circuit for the heating water (or other suitable liquid), with a flow to the heating source, such as a gas or oil burner or a wood or Holzpelletbrenner, and a return to the memory. It can also be provided several heat sources. Furthermore, such a system has a second, open drinking water circuit, with a feed for cold fresh water and a drain for heated service water. In addition, a third, in turn closed circuit for a solar system and / or another may be provided for a heat pump. Due to the temperature-dependent density of the water, a stratification forms in the storage vessel so that the warmest water is found at the top, while the coldest is found at the bottom of the vessel. The various feed and return flows are arranged accordingly. The separate second circuit is conventionally arranged in the upper part and there thermally coupled by an often coiled heat exchanger to the first circuit. Such systems have to provide equally convenient water delivery in different usage situations as well as be energy efficient. In this regard, the known systems are not yet fully satisfactory.

The invention therefore sets itself the goal of improving the known system in terms of economy and comfort in use.

It has now been found that, surprisingly, the above requirements can be fulfilled better with a structure completely different from the known arrangement. For this purpose, the invention proposes a combination storage according to claim 1. The combined storage device according to the invention is used together with at least one device for heating the heating water. This heat source is usually offered separately and is not part of the invention.

The solution described here proposes a departure from the prevailing teaching to arrange the return of the heating water heated by the heat source above the flow of the cooled water to this, instead to arrange in the interior of the vessel for the heating water another for the service water. The returning, hot heating water is generally performed from bottom to top either by at least one guide tube through this inner vessel, or vice versa, the service water through at least one pipe through a guide tube for the returning, hot heating water. In both variants, therefore, the returning, hot heating water enters below the flow for the cooled water in the memory.

In addition, the part of the outer vessel surrounding this central guide tube or the inner vessel sleeve-like manner by a non-hermetically separating structure such. As a perforated plate, be divided into an upper and a lower chamber. Also, a double subdivision into an upper, a lower and an intermediate middle chamber is possible. The separation structures may be frustoconical with multiple holes in a plate terminating the smaller face. In embodiments, an upper truncated cone is upright, a lower truncated cone inverted, so arranged with the smaller end face down, similar to a funnel. In general, it may be provided that the separating structure terminates on the outside of the storage wall. The connection of the superimposed chambers thus takes place further inside and thus in the radial direction away from the returns.

In a first variant, the inner vessel for the service water is an upright arranged in the longitudinal axis of the memory pipe with a respective inlet and outlet for cold fresh water and heated service water. These inlets and outlets extend radially through the outer vessel and the storage wall. The length of the tube is suitably greater than half the height of the storage vessel. The tube is closed at the top and bottom; however, a number of guide tubes pass lengthwise, for example 3 to 12 tubes, to which heated heating water from below is supplied from the return from the heating source. Alternatively, the service water is guided in such a plurality of tubes, and the heating water is passed through a guide tube surrounding these tubes. Both embodiments have in common that after the Heat is delivered to the service water in the upper chamber warm heating water ready. The stratification according to the water temperature can thus be maintained despite the inflow of heated water in the lower chamber. However, it is now combined with a radial temperature gradient that reduces heat loss because the hottest water is inside.

To the same extent as is supplied by the return heated heating water, cooled heating water exits through the flow to the heat source. This flow is arranged in embodiments above the return, in the middle or even upper third of the memory; if necessary, it can be arranged in the middle chamber. Likewise, the return from the consumers (eg radiators) supplied by the store with warm water can lead to the middle chamber or into the middle third of the store. The associated flow is located in the upper third of the memory.

In a variant, a third, closed circuit for a solar heat supply is provided. Its thermal coupling can be effected by a plate-surface Strahlungsradiator, which is arranged adjacent to the feed for the heated heating water below the guide tube. It has been found that the heat transfer to the heating water at this position is particularly efficient.

Further features of the invention will become apparent from the following description of exemplary embodiments in conjunction with the claims and the figures. In the figures, the same or similar elements are denoted by the same or similar reference numerals. The invention is not limited to the described embodiments but determined by the scope of the appended claims. In particular, the individual features in embodiments according to the invention can be realized in a different number and combination than in the examples given below. In the following explanation of an embodiment, reference is made to the accompanying figures, of which

1 shows a known system for illustration;

2 shows an embodiment of a memory according to the invention in longitudinal section; and

3 shows an exemplary arrangement of the heating water guide tubes in the inner (potable) vessel.

In 1 is a summary of a conventional system of a combi-memory with its various water circuits shown. The central component is the actual water storage 2 with here dash-dotted lines indicated vertical axis. Usually, such water tanks are built for stability reasons generally cylindrical. The heat source T is from the memory via the flow 7 and the supply line 7a supplied with heating water, which heated via the return line 6a and the return 6 in the store 2 to be led. Another heating source, eg. As a solar system P, with its own water cycle has corresponding components 11a - 11d , Inside the store 2 For this purpose, a separate heat exchanger is provided (not shown here). On the consumer side (right in the illustration), three units U are shown, the heated heating water via pre-runs 8th and flow lines 8a received, and via a common return line 9a and a return 9 the cooled heating water back to the store 2 conduct. In this overview, the necessary components for drinking water supply are omitted; they can be arranged in an insert, which is embedded in the upper end face of the cylindrical memory.

In 2 is a store 12 represented according to an embodiment in longitudinal section. The memory 12 represents an outer vessel in which centrally an inner vessel 14 made of stainless steel (AISI 316T), with radial inlets and outlets 16 . 18 , This inner tube, its upper and lower faces 20 and 22 are closed, serves the management of the process water through the store. The heat transfer to the service water takes over a Leitrohranordnung 24 (in 3 6 tubes are shown in concentric arrangement; also 5 or 7 tubes are possible) which run lengthwise through the inner vessel 14 leads. In this example, the guide tubes are designed as straight pieces of pipe, a certain Helizität but would also be possible. In the area of the lower edge of the inner vessel 14 is a ring stop 26 arranged, which does not extend radially all the way to the outer wall. Below the lower edge of the inner vessel 14 is a feed opening 28 arranged for supplied from the heat source water, the end of which is bent upward. At this position can also be the heat exchanger 52 be arranged a solar system. In two places of the circumference of the inner vessel 14 are frustoconical dividers 30 . 32 mounted, the upper upright and the lower inverted. Both sheets close outside on the wall of the store 12 from; in the radially inner region is the smaller of the two end faces 34 through a stainless steel perforated plate 36 permeable completed. The larger faces 38 are completely open. These sheets hold the inner vessel 14 , The memory stands on a pedestal 50 , It can be an electric fresh water booster heater 48 be provided.

The return 40 of the heated heating water is below the annular aperture 26 arranged and with the feed opening 28 connected. The lead 42 for the supply of cooled water to the heating source F is located further up, in one example at or below the upper cone 30 , The forward and return flows 44 . 46 for consumers U are at different levels at the periphery of the store 12 arranged, expediently at the level of the lower cone (return 46 ) or above the upper cone (flow 44 ).

Regarding the size ratios of in 3 It is expedient to choose the inner diameter d of the guide tubes relative to the smallest distance D of the tubes from one another such that the ratio d: D between 1: 3 and 3: 1 is between 1: 2 and 2: 1. This ensures that on the one hand the hot water volume between the guide tubes is sufficient, and on the other hand, the flow resistance for the supplied hot heating water is not too large. Decisive here is the way the distance (not center distance!) Of regularly arranged around the vertical axis around pipes, regardless of the presence of a pipe on this vertical axis. As can be seen, all of these distances are the same for an array of six tubes around a central seventh tube of the same size. In the illustrated array of five peripheral and one central tube, the spacings of the peripheral tubes are slightly larger than their respective distances from the central tube. A renunciation of the highest possible symmetry is also possible.

The hot water tank can be designed for a volume of 300-2000 liters or, if required, up to 5000 liters. A typical storage tank with a capacity of approx. 1000 liters may have the following dimensions: inner diameter 790 mm; Outer diameter 990 mm; Cover diameter 790 mm; Ring Diameter 600 mm; Diameter of the dhw cylinder 340 mm; Standard size of the guide tubes 1 '' (25.4 mm) or even 1¼ '' (31.75 mm), so that the net content of the service water pipe is about 80-90 liters; Perforated outer diameter 500 mm, width of perforated plate rings 80 mm; Width of the rings fixing the frusto-conical dividers to the inner wall 50 mm. It remain for the difference of the radii of the small and large faces of the truncated cones 95 mm, so that the inclination angle of the lateral surface in the range of 15-40 °, preferably 20-35 ° or more preferably 25-30 ° to the vertical axis. The diameters are to be adjusted accordingly if space is different. As a reference, the third root of the exemplary volume, ie 1 m serve. For a container of twice the size, therefore, all lengths should be multiplied by a factor of 1.26 (1.26 ³ ≈ 2); the angles remain the same.

Those skilled in the art will recognize that various modifications and additions to the above-described examples are possible without departing from the scope of the appended claims. For example, instead of a shield plate with 600 mm diameter, a smaller ring aperture 26 as in 2 be provided shown. Also, a temperature sensor connected to a control can be arranged in the upper chamber or in the upper third of the memory, which outputs the current temperature or a signal derived therefrom to the controller. This can, for. B. be designed or programmed so that it sets the heat source when falling below a first, lower threshold in function and then goes out of action when subsequently exceeding a second upper threshold. Instead of the heating source itself, a three-way valve for the heating water can be switched as needed in Festbrennstoffheizquellen in this manner.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 2031333 A2 [0002]

Claims (15)

Domestic hot water combination storage tank for supplying both heated drinking water and heating water, with an outer vessel filled with heating water during operation ( 12 ) with one each 42 ) and a return ( 40 ) for the supply or supply of heating water; and one filled with drinking water during operation, within the outer vessel ( 12 ) arranged inner vessel ( 14 ) with one each 16 ) and an outlet ( 18 ) for the supply and removal of drinking water; wherein a guide tube the inner vessel ( 14 ) within the outer vessel, or one or more guide tubes ( 24 ) inside the inner vessel ( 14 ), which extend generally from bottom to top and into the upper third of the outer vessel ( 12 ), and a feeder ( 28 ) for heated heating water to the guide tube (s) ( 24 ) in the lower third of the outer vessel ( 12 ) is arranged. The process water storage according to claim 1, wherein the central guide tube or the inner vessel ( 14 ) sleeve-like surrounding part of the outer vessel ( 12 ) by a separation structure ( 30 . 32 ) is subdivided into at least one upper and one lower chamber. Hot water storage according to claim 2, wherein the separating structure ( 30 . 32 ) provides a double division into an upper, a lower and an intermediate middle chamber. A service water storage according to claim 2 or 3, wherein the separation structure ( 30 . 32 ) is frustoconical and has a plurality of holes in the radially inner half, the larger end face ( 38 ) of the truncated cone is open. Hot water tank according to claim 3 or 4, wherein an upper truncated cone ( 30 ) upright or inverted, and a lower truncated cone ( 32 ) is arranged inverted. Hot water tank according to one of claims 2 to 5, wherein the outer edge of the separation structure ( 30 . 32 ) terminates at the storage wall. Hot water storage according to one of the preceding claims, wherein the inner vessel ( 14 ) one upright in the vertical axis (L) of the outer vessel ( 12 ) is arranged pipe. Hot water tank according to claim 7, wherein the length of the pipe ( 14 ) greater than half the internal height of the outer vessel ( 12 ) on its vertical axis (L). Hot water tank according to claim 7 or 8, wherein the pipe ( 14 ) is closed at the top and bottom and 3 to 12 guide tubes ( 24 ) lengthwise through the pipe ( 14 ). A service water storage according to claim 9, wherein the pipe ( 14 ) Inflows and outflows ( 16 . 18 ) for fresh water and heated service water extending radially through the outer vessel ( 12 ) and the storage wall extend. Hot water tank according to claim 7 or 8, wherein the service water is guided in a plurality of tubes and the heating water is passed through a conduit surrounding these tubes. Hot water tank according to one of the preceding claims, wherein the flow ( 42 ) for the heat source to be supplied water above the return ( 40 ) is arranged for heated, coming from the heat source water, preferably in the middle or upper third of the memory, possibly in the middle chamber. Hot water storage according to one of the preceding claims, wherein the return ( 46 ) from the consumers (U) supplied with the tank with warm water into the middle or lower chamber or into the middle third of the storage tank. Hot water tank according to claim 13, wherein the associated flow ( 44 ) is located in the upper third of the memory. A service water storage according to any one of the preceding claims, wherein a radiant panel radiant panel ( 52 ) is provided for the thermal coupling of a third, closed circuit (P) for a solar heat supply, wherein the Platten-Radungsflächeradiator ( 52 ) next to the feeder ( 28 ) for the heated heating water and / or below the guide tubes ( 24 ) is arranged.

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