AT405454B - HOT WATER HEATING - Google Patents

Description

AT 405 454 B

The invention relates to a water heater according to the preamble of the claim.

In such devices, in addition to the cold water supply line and the tap line, the stratified storage tanks also have a cold water outlet and a hot water inlet, which are connected to the heat exchanger. This results in the disadvantage of a considerable outlay in the production of the layered storage due to the many lines connected to the layered storage.

From DE 3 411 566 and 3 434 480, a domestic hot water tank with a bypass section has become known, but in which only two pipes are connected to the storage tank. The operation of this water heater is conventional, however. that is, a charging operation takes place via the bypass route, and a domestic water supply is carried out via the storage tank. From DE 3 245 285 a heat exchanger for a hot water tank filled with process water has become known, which consists of a double pipe, one of which is supplied by a district heating supplier.

The aim of the invention is to avoid the disadvantages mentioned at the outset and to propose water heating of the type mentioned at the outset, which is distinguished by a substantially simplified structure.

According to the invention, this is achieved in the case of water heating of the type specified in the introduction by the characterizing features of the patent claim.

The aim of the invention is to avoid this disadvantage and to propose a water heater of the type mentioned at the outset, which is distinguished by a simple structure.

Furthermore, there is a particularly simple construction, and a complete blocking of the bypass section is possible.

The invention will now be explained in more detail with reference to the drawing.

Show:

Fig. 1 shows schematically a water heater and

Fig. 2 to 5 different operating states of the device according to the invention.

The same reference numerals mean the same details in all figures.

In a water heating device according to the invention, a stratified storage tank 1 has a cold water supply line 2 opening into its lowermost region 17 and a tap line 3 arranged in its uppermost region 26.

In the cold water supply line 2 and in the tap line 3 branches 4, 4 'are arranged in the form of T-pieces, to which a bypass section 19 and a further tap line 3' or a feed water line 2 'are connected. The bypass section 19 has a circulating pump 6 connected via a connecting line 21, preferably controllable in its speed, a throttle 5 connected via a further connecting line 14 and a heat exchanger 7 connected via connecting lines 15, 16 to the throttle 5 and the branch 4.

The heat exchanger 7 is connected on the primary side via a flow line 17 to a primary heat exchanger 13 which is acted upon, for example, by a burner (not shown). Furthermore, the heat exchanger 7 is connected on the primary side via a connecting line 18 to a circulation pump 12 which is connected to a return line 20 which leads to the primary heat exchanger 13.

A temperature sensor 10 is arranged in the connecting line 16 and is connected to a controller 11 via a control line 22. Temperature sensors 8 and 9 are connected to these on the input side via control lines 23 and 24 in the central region 28 and in the lower region 27 of the stratified storage 1.

The circulation pump 6 is connected on the output side via a control line 25.

The controller 11 switches the circulation pump 6 on as soon as the temperature sensor 8 reports a heat requirement. At the same time, heat is also supplied to the primary heat exchanger 13 via, for example, a burner. At the same time, by starting up the pump 6, a circuit is formed from the stratified storage tank 1, via the cold water supply line 2, the bypass section 19 back to the stratified storage tank 1 and the water in the heat exchanger 7 is heated and via the connecting line 16 and the tap line 3 into the uppermost region 26 of the stratified storage tank 1 initiated again. The speed of the circulation pump 6 can also be controlled as a function of the signals from the temperature sensor 10 in order to avoid an excessively high temperature which could lead to scalding in the event of a simultaneous tap. Charging of the stratified storage tank 1 is ended when the temperature sensor 9, which is arranged in the lowermost region 27 of the stratified storage tank 1, indicates a sufficiently high temperature.

Various operating states are possible in the water heating device according to the invention.

Thus, Fig. 2 shows an operation in which the tapping throughput flowing out through the further tapping line 3 'is greater than the flow through the bypass section 19. The cold water inflow branches out in the branch 4', with part of the cold water in the lowermost Area 27 of the layer memory 1 flows. At the same time, warm water flows from the uppermost region 26 of the layer 2

Claims (1)

AT 405 454 B storage tank 1 via the tap 3 to the branch 4, in which it mixes with the heated water coming via the bypass section 19 and flows out via the branch 4 into the further tap 3 '. 3 shows an operating state in which only a low throughput of the process water is tapped, which is below the water throughput flowing through the bypass section 19. Cold water is drawn off from the lowermost region 27 of the stratified storage tank 1 via the cold water inlet 2, cold water simultaneously flowing in via the cold water supply line 2 ′ to the branch 4. The water heated after flowing through the bypass section 19 is divided in the region of the branch 4, part of the heated water flowing out via the further tap 3 'and another part flowing in via the tap 3 into the uppermost area 26 of the stratified storage tank 1 and this charges. FIG. 4 shows an operation in which tapping is only carried out without flowing through the bypass section 19 and therefore tapping is made possible only by discharging the stratified storage device 1. The circulation pump 6 remains stopped, and if necessary the valve 5 is also closed. During the tapping, the entire tapping quantity is taken from the uppermost area of the stratified storage tank 1, cold water flowing in via the supplying cold water supply line 2 'and the cold water supply line 2 into the lowermost area 27 of the stratified storage tank 1. As a result, the boundary layer between the warm water and the cold water in the stratified storage tank moves upwards. FIG. 5 shows an operation in which the stratified storage device 1 is only charged, with no tapping being carried out. Cold water flows from the lowermost area 27 of the stratified storage tank 1 via the cold water supply line 2 to the branch 4 ', flows through the bypass section 19 and, in the heated state, reaches the uppermost area 26 of the stratified storage tank 1 via the branch 4' and the tap 3 the stratified storage tank 1 is loaded with warm water from above, the boundary layer between warm water and cold water sinking downward. The charging of the stratified storage device 1 is ended when the temperature sensor 9 detects a sufficiently high temperature. 1. Water heating with a stratified storage tank (1), at the lowest area (27) of which a cold water supply line (2) and at the uppermost area (26) of a tap line (3) are connected, a bypass section (19) parallel to the stratified storage tank (1 ) is provided, which is connected via a branch (4 ') to the cold water supply line (2) and a further cold water line (2') and via a branch (4) to the tap line (3) and a further tap line (3 ') and has a circulation pump (6) and a secondary heat exchanger (7) which is connected on the primary side to a heat exchanger (13) acted upon by a heat source, characterized in that the circulation pump (6) is part of the cold water flowing in through the further cold water supply line (2 ') Pumps over the bypass section (19) to the further tap line (3 '), while the remaining inflowing cold water pumps into the lowermost area (27) of the layer tens storage (1) flows in and at the same time warm water flows from the uppermost area (26) of the stratified storage tank (1) via the tap line (3) to the further tap line (3 ') or that the circulation pump (6) through the further cold water supply line (2') inflowing cold water and water flowing in through the cold water supply line (2) from the lowermost region (27) of the stratified storage tank (1) via the bypass section (19) to the further delivery line (3 '), non-drawn water via the delivery line (3) for charging of the stratified storage tank (1) flows back into its uppermost area (26) or that the circulation pump (6) is stopped, whereby - as is known per se - tap water is drawn from the uppermost area (26) of the hot water tank (1) via the tap line (3) is or that the circulation pump (6) - as known per se - from the lowermost area (27) of the stratified storage tank (1) water flowing through the bypass section (19) for charging of the stratified storage tank (1) pumps in its uppermost region (26). Add 5 sheets of drawings 3