DE29606696U1 - Heat buffer storage for a heating system - Google Patents

Description

63 785 Obernburg am Main, DE

Heat buffer storage for a heating system

The invention relates to a heat buffer storage tank for a heating system.

By means of a heat buffer storage tank, energy is supplied to a heating system from outside in addition to the internal energy supply.

In the current state of the art, heat buffer tanks are kept at the temperature level of the heating system or are operated at a base temperature of around 50 ⁰ C in order to ensure that domestic water is heated. At this energy level, feeding in energy at a lower temperature level, such as solar energy, is only rarely possible. Switching off the internal energy supply when there is sufficient external energy supply is only possible with increased control technology effort, or the internal energy supply switches on to maintain its set temperature level.

·

In contrast, the invention is based on the object of providing a heat buffer storage in a heating system that is always ready to receive an external energy supply and always optimally supplies its energy to the heating system.

system and is also ready for use with external energies at low temperature levels, such as solar energy and process waste heat.

The problem is solved with the features of the protection claims.

The invention is based on the basic idea of arranging the heat buffer storage in the return line of the heating system. This makes it possible to store energy at a low

Temperature level to be supplied to the return flow of the heating system, which is at a low temperature, if the temperature in the heat buffer tank exceeds that of the return flow.

The invention has the following advantages.
20

The heat buffer storage does not have to be at a fixed temperature level, and there are fewer radiation losses than with state-of-the-art heat buffer storage. Intervention in the control system of the heating system is

not necessary. The integration into the return flow can be carried out using simple control technology and existing heating systems do not have to be dismantled. This enables simple retrofitting into almost any standard heating network. Intervention in the control system of the

Heating network is not necessary. The heat buffer tank raises the return temperature so that the risk of dew point in a boiler is minimized.

In the following, the invention is explained in more detail with reference to the drawing

explained. They show:

•Φ · ·

Fig. 1 shows an embodiment according to the invention in combination with a boiler and a solar collector system and

Fig. 2 shows an embodiment according to the invention in which two 5

external energy sources heat the heat buffer storage.

Fig. 1 shows the schematic representation of a preferred heat buffer storage tank 1 in a heating system. A heating boiler 9 generates internal heat, which is supplied to a heater (not shown) by a heating fluid via a supply line 11. The heat buffer storage tank 1 can be switched on in return lines 2 from the heater and the domestic hot water storage tank 12 via a three-way valve 6, whereby the temperature of the 15

Heating fluid in the return line is increased.

In the embodiment according to the invention according to Fig. 1, the heat buffer storage tank 1 is equipped with a solar collector system 10

connected, which supplies solar heat to the heat buffer storage 1-20

A heating coil 7 in the

Heat buffer storage 1, through which heating fluid 8 flows from the solar collector system 10. Alternatively, the heat is transferred directly (without a heat exchanger), e.g. by supplying and removing an external heating fluid to the heat buffer storage. The 25

The flow of the heating fluid 8 through the heat buffer tank 1 is controlled by a differential temperature circuit 15, which measures and compares the temperature of the heating fluid 8 at the collector and the temperature in the heat buffer tank 1 using temperature sensors 13 and 14, respectively, by operating a valve in this circuit. The temperature in the heat buffer tank 1 and in the return line 2 upstream of the heat buffer tank 1 is measured and compared using temperature sensors 3 and 4, respectively, using a temperature differential circuit 5. The differential temperature circuit controls the three-way valve 6 so that the heat buffer tank 1 is switched to the return line 2 when the temperature of the heat buffer tank 1 is higher than that of the

: ♦

return flow 2. A commercially available so-called Resol circuit can be used as the temperature difference circuit 5, 6.

If the temperature level in the heat buffer tank 1 is higher than the target switch-on temperature, e.g. of a boiler, the heat buffer tank is not switched on. The connection of the heat buffer tank 1 to the return 2 means that a boiler only uses the difference in the temperature level of the

Heat buffer storage must be heated up to the target temperature of the boiler and not the low level of the heating return. This saves energy in the internal energy supply.

In addition to solar energy, the heat buffer storage can also be heated by other external energy sources that may be at a low temperature level, such as process waste heat (such as machine waste heat, boiler firing), heat pumps, etc. A combination of

external energy sources possible.

Such an embodiment is shown in Fig. 2. The heat buffer tank 1 corresponds in essential parts to the

of Fig. 1. Identical parts are identified by identical reference 25

symbol. Reference number 15 represents a vent valve. In the embodiment according to Fig. 2, in addition to an energy source, such as a solar source (connections 19, 20), heat is provided from another energy source,

such as a tiled stove (not shown), by means of a 30

Heating fluid is fed directly into the heat buffer tank via connection 17 and returned to the tiled stove via tap 18. There the heating fluid is heated up again, e.g. in a coil. This direct heat exchange in the

Heat buffer storage is suitable if the internal 35

and the external energy source the same fluid, e.g. pure water, can be used to transport heat.

Claims (10)

1> · Protection claims 1. Heat buffer storage (1) for a heating system, wherein the Heat buffer storage (1) is designed so that it 5 Heat can be transferred to the return line (2) of a heating system. 2. Heat buffer storage according to claim 1, characterized in that the heat buffer storage (1) is arranged parallel to the return (2) and the return (2) is passed through the heat buffer storage (1) when the temperature of the heat buffer storage (1) is higher than that of the return (2) by a certain temperature difference (At). 3. Heat buffer storage according to claim 2, characterized in that the temperature in the heat buffer storage (1) and in the return line (2) before the heat buffer storage (1) via temperature sensors (3 or 4) using a differential 20 limit temperature circuit (5) is detected and compared. 4. Heat buffer storage according to claim 3, characterized in that the differential temperature circuit (5) Flow of the return (2) through the heat buffer storage-25 rather controls (1). 5. Heat buffer storage according to one of claims 2 to 4, characterized in that the return flow (2) is guided through the heat buffer storage (1) via a three-way valve (6). 6. Heat buffer storage according to one of claims 1 to 5, characterized in that the heat buffer storage (1) is heated by solar energy. · 7. Heat buffer storage according to one of claims 1 to 5, characterized in that the heat buffer storage (1) is heated by process waste heat. 8. Heat buffer storage according to one of claims 1 to 7, characterized in that it is heated directly or via a heat exchanger (7). 9. Heat buffer storage according to claim 8, characterized in that-10 characterized in that the heat exchanger is a heating coil (7) through which an external heating fluid (8), e.g. with process waste heat or solar heat, is passed. 10. Heat buffer storage according to claim 8, characterized in that-15 characterized in that an external heating fluid is fed into and discharged from it via connections (17, 18).