DE29512131U1 - Layered storage arrangement - Google Patents

Description

2 6.07,95

Jon. Vaillant GmbH u. Co.

GM1387

The invention relates to a stratified storage arrangement according to the preamble of claim 1.

In conventional stratified storage arrangements of this kind, temperature sensors are provided in the lower and middle areas of the storage tank and in the hot water inlet, with the cold water outlet being directly connected to the heat exchanger. If the temperature in the middle temperature sensor area falls below a minimum, a heat request is activated and a heating process is started. This is only completed when the lowest sensor indicates that a specified target temperature has been reached. The top sensor ensures that the circulation pump operates continuously or intermittently, depending on the prevailing temperature.

However, this has the disadvantage that overheating and thus the risk of scalding when tapping cannot be prevented, since all components in the circuit leading from the cold water outlet to the hot water inlet are connected exclusively in series.

The aim of the invention is to avoid this disadvantage and to propose a layered storage arrangement of the type mentioned at the beginning, in which overheating in the uppermost area of the storage is reliably avoided.

According to the invention, this is achieved in a memory arrangement of the type mentioned at the outset by the characterizing features of claim 1.

The proposed measures make it possible to add relatively cold water to the hot water supply during the charging of the storage tank, depending on the temperature prevailing in the hot water supply. This reliably prevents overheating in the upper part of the storage tank.

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

The layered storage arrangement according to the invention has a layered storage tank 1 provided with thermal insulation 25, in the lowest and middle areas 24 of which a temperature sensor 6 and 5 are arranged respectively. A cold water inlet 8 opens into the lowest area of the layered storage tank 1. A cold water outlet 23 protrudes into this lowest area 9, which is connected to a circulation pump 2, which is connected via a connecting line 10 to a proportionally operating mixing valve 7, to which a 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 flows into a hot water inlet 13, which flows into the uppermost area 14 of the stratified storage tank 1. A tap line 15 leads away from this uppermost area 14 of the stratified storage tank 1.

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

Furthermore, a further temperature sensor 4 is arranged in the hot water inlet 13 leading 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 specified minimum temperature is not reached in the area of the temperature sensor 5, this target value deviation triggers a heat request and the circulation pump 2 begins to draw cold water via the cold water outlet 23 and conveys it via the mixing valve 7 to the heat exchanger 3, which is charged with the corresponding heating medium. The heated water flows into the uppermost area 14 of the stratified storage tank 1. This causes the boundary layer between cold and warm water to sink downwards in the storage tank.

At the same time, the temperature sensor 4 detects the temperature in the hot water inlet 13, and if a predetermined limit is exceeded, the mixing valve 7 is activated by the control system so that part of the cold water pumped by the circulation pump 2 flows via the bypass line 11 to the hot water inlet 13 and is mixed with the heated water. This prevents the temperature in the uppermost area 14 of the stratified storage tank 1 from becoming too high, which could lead to scalding when water is drawn via the draw-off line 15.

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

When a water is drawn off, warm water is drawn off from the uppermost area 14 of the stratified storage tank 1, whereby cold water flows 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.

Claims (1)

•♦ · · · * &iacgr; ii.. 2 6. 07, Joh. Vaillant GmbH u. Co. GM 1387 CLAIM Stratified storage arrangement with a storage tank provided with thermal insulation (25), a cold water inlet (8) arranged in its lowest region (9), a cold water outlet (23) connected to a heat exchanger (3), a hot water inlet (13) opening into the uppermost region (14) of the storage tank (1) and connected to the heat exchanger (3), and a tap line (15) arranged in the uppermost region (14) of the storage tank (1), wherein a circulating pump (2) is arranged in the circuit leading over the heat exchanger (3), and temperature sensors (5, 6) are arranged in the lowest and middle regions (9, 24) of the storage tank (1), which are connected to a control (18) controlling the circulating pump (2), characterized in that a mixing valve (7) is arranged in the cold water outlet (23) between the circulating pump (2) and the heat exchanger (3), which has a heat exchanger (3) bridging bypass line (11) controls, and furthermore a temperature sensor (4) connected to the control (18) is arranged in the hot water inlet (13), wherein the control (18) also controls the mixing valve (7).