AT403732B - LAYER STORAGE ARRANGEMENT - Google Patents

Description

AT 403 732 B

The invention relates to a stratified storage device according to the preamble of the single claim.

In such a stratified storage tank arrangement known from DE-33 12 479 A1, temperature sensors are provided in the lower, middle and upper or heat exchanger area of the storage tank, the cold water outlet and the hot water inlet being connected directly to the heat exchanger. When the temperature falls below a minimum in the area of the middle temperature sensor, a heat request is activated and a heating process is started. This is only ended when the lowest sensor indicates that a specified target temperature has been reached. The uppermost sensor adjusts the speed of the circulation pump depending on the prevailing primary circuit temperature. As a result, the temperature in the hot water supply is constant, so that there is no overheating in the uppermost storage area and therefore there is no risk of scalding when drawing off the hot water. The disadvantage is the need for a complicated and fault-prone speed control.

The aim of the invention is to avoid this disadvantage and to propose a stratified storage arrangement of the type mentioned at the outset in which overheating in the uppermost region of the storage is reliably avoided in a simpler and less susceptible manner to faults.

According to the invention this is achieved by the characterizing features of claim 1.

The proposed measures make it possible to add relatively cold water to the hot water supply as a function of the temperature prevailing in the uppermost region of the storage unit or in the hot water supply in the course of charging the store. Overheating in the uppermost area of the storage can thus be reliably prevented.

This will now be explained in more detail with reference to the drawing, which schematically shows a layer storage arrangement according to the invention.

The layered storage arrangement according to the invention has a layered storage 1 provided with thermal insulation 25, in the lower and middle regions 9 and 24 of which a temperature sensor 6 and 5 is arranged. A cold water inlet 8 opens into the lowermost area 9 of the stratified storage tank 1. In this lowermost area 9, a cold water drain 23 projects into it, which is connected to a circulation pump 2, which is connected via a connecting line 10 to a proportionally operating mixing valve 7, on which one Bypass line 11 and a return line 12 leading to a heat exchanger 3 are connected.

The bypass line 11 bridges the heat exchanger 3 and opens into a hot water inlet 13 which opens into the uppermost region 14 of the stratified storage tank 1. A tap line 15 leads away from this uppermost region 14 of the stratified storage tank 1.

The heat exchanger 3 is connected via a forward and a return line 16, 17 to a heat source, not shown.

Furthermore, a further temperature sensor 4 is arranged in the hot water inlet 13 opening into the stratified storage tank 1.

The temperature sensors 4, 5 and 6 are connected to inputs of a control 18 via lines 19, which are connected on the output side via lines 20, 21 to a drive 22 of the mixing valve 7 and a drive of the circulation pump 2 and control them.

If a predetermined minimum temperature is not reached in the area of the temperature sensor 5, this setpoint value deviation triggers a heat request, and the circulating pump 2 begins to draw off cold water via the cold water drain 23 and conveys this via the mixing valve 7 to the heat exchanger 3, which acts on the corresponding heating medium is. The heated water flows into the uppermost region 14 of the stratified storage tank 1.

As a result, the boundary layer between cold and warm water sinks down in the storage tank.

At the same time, the temperature in the hot water inlet 13 is detected by the temperature sensor 4, and when a predetermined limit value is exceeded, the mixing valve 7 is actuated by the controller, so that part of the cold water conveyed by the circulation pump 2 flows via the bypass line 11 to the hot water inlet 13 and is added to the heated water. In this way, an excessively high temperature in the uppermost region 14 of the stratified storage device 1 is avoided, which could lead to scalding if the tap is started via the tap line 15.

If a certain upper temperature is exceeded in the lowermost area 9 of the stratified storage tank 1, the heating of the stratified storage tank 1 is terminated via the control 18, the circulation pump is stopped and the application of heating medium to the heat exchanger 3 is ended.

In the case of a tap, warm water is drawn off from the uppermost area 14 of the stratified storage tank 1, cold water flowing in via the cold water inlet 8 into the lowermost area 9 of the stratified storage tank 1 and therefore the boundary layer between warm and cold water rises. 2nd

Claims (1)

1. Layered storage arrangement with a heat insulation (25) provided storage, a cold water inlet (8) arranged in its lowermost area (9), a cold water outlet (23) connected to a heat exchanger (3), one in The uppermost area (14) of the storage tank (1) opening and connected to the heat exchanger (3) in the hot water inlet (13) and a dispensing pipe (15) arranged in the uppermost area (14) of the storage tank (1). 3) leading circuit, a circulating pump (2) is arranged and temperature sensors (5 and 6 as well as 4) are arranged in the lowest and middle areas (9 and 24) as well as in the top area (14) or in the hot water inlet (13) of the storage tank (1) are connected to a controller (18) controlling the circulation pump (2), characterized in that a mixing valve (7) is arranged in the cold water drain (23) between the circulation pump (2) and the heat exchanger (3), to which a bypass line (11) bridging the heat exchanger (3) is connected, the controller (18) also controlling the mixing valve (7). With 1 sheet of drawings 3