DE19842613C1 - Through flow heater for drinking water and heating system has the drinking water heated by a larger section, with ducted flow through gas heated sections, prevents sudden temp. changes - Google Patents

Abstract

A multi purpose gas fired water heater has a cold water inlet (2) and a hot water outlet (3) for drinking water, and a circuit (4,5) for a heating system. The heater is divided into two sections and has the drinking water heated mostly in the larger section (1). The heating and drinking flow are in opposite directions through the small section heater (1') and in parallel flows through the larger section (1). This provides an optimum heating mode with no sudden changes in the temperature of the drinking water output.

Description

The invention relates to a flow device with a small volume for DHW heating, especially for installation in and for the connection with gas flow heaters, according to Ober Concept of claim 1.

Continuous flow devices of the type mentioned are well known and in use. It is also known that like continuous flow devices with gas flow heaters (see e.g. EP 0427121 A2) to combine or to connect hydraulically. The disadvantage of such combination water heaters, in which in the Usually also a heating circuit is connected that after the tapping of the drinking stored in the relatively small volume amount of water a noticeable "sagging" of the hot water running temperature is observed, d. that is, with certain loading operating states (e.g. sliding mode - summer mode) does not stand for convenient use at the start of the tap heating water temperature required supply.

The invention is accordingly based on the object To create a continuous flow device that does not have this disadvantage, d. that is, starting from a flow device of the type mentioned Kind, this should be in a compact design to be redesigned and improved that the Avoid so-called "sagging" of the hot water outlet temperature which is at least significantly reduced.

This task is with a flow device of the beginning mentioned type according to the invention by the in the characteristics of Claim 1 solved features.  

This training according to the invention means that the warmwas part of the downstream side of the container with a high degree of efficiency with regard to the Heat transfer and the cold water inflow part of the tank works as a "storage part" with lower efficiency, where with a fundamentally relatively small total hydraulic volume of the flow device with the entire content on the drinking water side Max. 3 liters is dimensioned and distributed so that the "Storage section" to accommodate a larger volume of drinking water than the part of the tank on the hot water outlet side. This The division is then sufficient to ensure that when tapping To bridge "dead time" which, as mentioned, arises when the required heating water temperature is not immediately available is.

This solution according to the invention is therefore not limited to Known regulation and control engineering measures for im above-mentioned convenient domestic hot water supply (see also EP 0427121 A2), but also prevails appropriate design on the flow device itself, d. i.e. from From time to time, the larger part of the storage volume becomes full Heat supply kept at "standby temperature".

The higher efficiency in the hot water downstream tank on the one hand, part is created by special design of the Partitions and thus the width of the gap spaces reached and other preferred in connection with a counterflow in this container part, which will be explained in more detail.

Regardless of the proviso that the cold and hot water and also the heating water supply and return connections "on each other container part "are to be arranged, all the These connections are preferably on the same side of the through treadmill arranged to combine its overall connection fold.

The flow device according to the invention and its advantageous Embodiments and preferred further developments are based on following on the basis of the graphic representation of execution tion examples explained in more detail.  

It shows

Figure 1 is a perspective and schematic of the inner structure of the flow device on by partition walls including the preferred flow guides gene.

Fig. 2 shows schematically the circuit diagram of the running device in a preferred embodiment with one-sided arrangement of all connections;

Figure 3 shows in section a part of the container with a special embodiment of the partitions.

FIG. 3A schematically illustrates a further embodiment of the formation of the gaps;

Fig. 3B is a perspective view of the preferred embodiment of the partition walls;

Fig. 4 perspective view of the flow device in Außenan and

Fig. 5 shows the circuit diagram of the flow device in connection with a heat generator and associated heating circuit.

In Figs. 1 to 5 are all, corresponding elements designated to corresponding reference numerals, that is, the loading container with 1 whose this gliedernde container parts 1 ', 1' 'of the cold water inlet port 2, the Warmwasserablaufan circuit 3 and the Heating water supply and return connections with 4 and 5 .

In addition, in Fig. 5 are a heat generator (gas flow heater) with WE, the heating circuit connected to this with HK and the compact parts from the two container parts 1 ', 1 ''combined flow device with DG.

For all illustrated embodiments is now, apart from those illustrated and different Interconnection possibilities, essential that the warmwasserabströmseitige container part 1 'is sized with a smaller volume than the kaltwasserzuströmseitige container portion 1' ', wherein the cold water inlet and hot water discharge connections 2, 3 and also the heating water supply and return connections 4 , 5 are arranged on the other container part 1 ', 1 ''and both container parts, combined to form container 1, are formed by partition walls 6 as plate heat exchangers, and the partition walls 6 alternating drinking water and heating water gap spaces 7 , 8 , each of which is connected to one another in such a way that a cocurrent and / or countercurrent connection is present in the container parts 1 ', 1 ''with respect to the two flow media.

It is also essential that, taking into account a higher pressure loss, the partition walls 6 in the smaller part of the container, seen in terms of area difference, have a greater heat transfer than those in the larger part of the container 1 ″.

In the schematic representation according to FIG. 1, the partitions 6 are only shown at an extreme distance from one another for reasons of clarity, that is to say the partitions 6 delimiting the gap spaces 7 , 8 have a distance of the order of magnitude of only approximately 2-10 mm, the Gaps 7 , 8 in contrast to the illustration in Fig. 1 in the container part 1 'are kept narrower than in the other container part 1 ''. In addition, you have to imagine the gap spaces 7 , 8 including the deflection chamber 9 to the outside, of course, as can be seen from Fig. 4.

The heating water supply is dash-dotted and the drinking water supply is dashed and each illustrated with directional arrows, whereby what, because of the directional arrows need no further explanation, is the preferred connection of the gap spaces 7 , 8 , namely direct current in the container part 1 '' and counterflow in the container part 1 '.

When Verschaltungsschema of FIG. 2, the heating return HR and the cold water inlet KW on the same side as the heating supply HV and the hot water outlet are arranged on the passage unit, in order, as mentioned above in the introduction, to obtain opportunities for more convenient connection. Binding at Verschaltungsschema of FIG. 1, but it would also be possible, if necessary, a further deflection chamber, in a way to bend by 180 ° in order to bring the terminals 2 and 5 on the same side of the container part 1 '' with the interposition such as the Connections 3 and 4 .

Apart from the fact that the gap spaces 7 or 8 can also be realized by individually prefabricated, known pockets T (see FIG. 3A), between which the other gap spaces are located (overflow or throughflow channels 6 '' are shown in FIG. ) not shown 3A can also be a exporting be provided 3 approximate shape of the passage unit shown in Fig., after which the partition walls 6 in the form of bowls 6 'from gehalsten, the gap spaces 7, 8 by cross-transfer channels 6' and aligned therewith insertion openings 6 '''Formed in the adjacent partition 6 and these partitions 6 stacked together with their shell edges 10 at all joints 13 together in a liquid-tight manner (for example by soldering).

For the partition walls 6 or the formation of the whole through device, however, partition walls 6 according to FIG. 3B are preferred, which are known per se, given the compact design and the narrow installation conditions in a gas water heater, but are of particular importance here. According to this, the partition walls 6 are also designed in the form of shells 6 'and are provided with in the region of their overflow openings 10 with embossed-free, oppositely directed connection surfaces 11 , in which case here also all joints 13 are connected to one another in a liquid-tight manner. This Lötver connection takes place in a special way in such a way that form-fitting shells made of thin "solder foil", such as Cu foil (not shown) are inserted between the shells 6 'made of, for example, thin stainless steel sheet, the whole stack of foils then being heated up and the Cu foils are melted.

With repeated reference to the circuit diagram according to FIG. 2, there is of course also the possibility of designing such shells 6 'or partition walls 6 in such a way that, where necessary, they each have three overflow openings at the top and bottom.

As far as the proviso that the partitions 6 in the smaller container part 1 'have a greater heat transfer than that in the larger container part 1 '', this is, apart from possible choice of materials with greater thermal conductivity, preferably achieved in that at least the one in the container part 1 ' arranged partitions 6 are provided with embossing enlarging the heat exchange surfaces, such as rib, cross rib, knob embossing or the like. Since such embossments on heat exchangers and also in general in boiler construction are known, this is not shown here in particular. The requirement that such embossments should be provided at least on the partitions of the container part 1 'naturally includes the possibility of also providing the partitions 6 in the container part 1 ''with such embossments, which are then selected and designed such that with less heat transfer in this part there is also less pressure loss. As a result, the container part 1 'has a greater efficiency than the container part 1 ''.

In the container part 1 ', for example, rib embossings (not particularly shown) are provided with a small, deep embossing depth leading to a smaller gap and those in the container part 1 ''with a greater embossing depth.

Claims (7)

1. Flow device with a small volume for DHW heating, especially for installation in and the connection with gas water heaters, consisting of a container ( 1 ) with cold water inlet and hot water outlet connections ( 2 , 3 ) and with heating water supply and return connections ( 4 , 5 ), the container ( 1 ) being divided into two container parts ( 1 ', 1 ''), each of which has a part carrying the drinking water and a part carrying the heating water,
characterized by
that the hot water outflow-side container part ( 1 ') is dimensioned with a smaller volume than the cold water inflow-side container part ( 1 ''),
that the cold water inlet and hot water outlet connections ( 2 , 3 ) and the heating water supply and return connections ( 4 , 5 ) are arranged on the other container part ( 1 ', 1 '') and both container parts combined to form the container ( 1 ), all in all by partitions ( 6 ) are designed as plate heat exchangers, of which the partition walls ( 6 ) arranged in the smaller container part ( 1 ') have a larger heat transfer with respect to the partition walls ( 6 ) in the other container part ( 1 '') and
that the partitions ( 6 ) alternating drinking water and heating water leading gap spaces ( 7 , 8 ) be bound, which are connected to each other in such a way that in the container parts ( 1 ', 1 '') a direct current and / or counter current circuit with respect to both flow media is present. 2. Continuous flow device according to claim 1, characterized in that all connections ( 2 to 5 ) are arranged on one side of the container ( 1 ). 3. Continuous flow device according to claim 1 or 2, characterized in that the drinking water and heating water leading gap spaces ( 7 , 8 ) are each interconnected such that in the container part ( 1 '') a direct current and in the container part ( 1 ') a countercurrent circuit is present. 4. Continuous flow device according to one of claims 1 to 3, characterized in that between the container parts ( 1 ', 1 '') at least one deflection chamber ( 9 ) which is likewise delimited by the partition walls ( 6 ) is arranged. 5. Continuous flow device according to one of claims 1 to 4, characterized in that at least the partitions ( 6 ') arranged in the container part ( 1 ') are provided with embossings which enlarge the heat exchange surfaces, such as ribs, cross ribs, knob embossments. 6. Continuous flow device according to one of claims 1 to 5, characterized in that the partitions ( 6 ) in the form of shells ( 6 ') and in the region of their overflow openings ( 10 ) with ribbed embossing, each directed opposite to the parting plane plane shaped connecting surfaces ( 11 ) provided and all joints ( 13 ) are connected to each other in a liquid-tight manner. 7. Continuous flow device according to one of claims 1 to 5, characterized in that the partitions ( 6 ) in the form of shells ( 6 ') with throat, the gap spaces ( 7 , 8 ) penetrating over flow channels ( 6 '') and aligned insertion openings ( 6 ''') in the respective adjacent partition ( 6 ) forms out and these partitions ( 6 ), with their shell edges ( 12 ) stacked together, are liquid-tightly connected to each other at all joints ( 13 ).