DE202008011719U1 - Device for heating and storing drinking water - Google Patents

Abstract

contraption for heating and storing drinking water with a cold water supply 1, a circulation supply line 15, a hot water discharge 11, three pumps 3, 14 and 16, two heat exchangers 5 and 7, a memory 10, a mixing point 12, a distribution point 13, a Mixing point / distribution point 2 and a mixing point / mixing valve 6, characterized characterized in that a first distance of mixing / distribution point (2) connected to pump (3) connected to secondary side Heat exchanger (5) and connected to mixing point (6), and parallel to this, a second of distribution point (13), connected to pump (14) and connected to mixing point (6), merged at the mixing point (6) and to the circuit directly via secondary side heat exchanger (7), drinking water storage (10) to the distribution point (13) and mixing point / distribution point (2) are connected.

Description

The The invention relates to a device for heating and storing of drinking water.

Out Known in the art are devices that provide drinking water Heat in a storage with integrated heating surface.

Farther Devices are known, the drinking water in the flow over heat a heat exchanger. Such devices As is well known, they can also supply their peak needs from a store cover on the primary side.

Known are also devices that are in a charging circuit, consisting of charge pump, Heat exchangers and storage, which warm and warm water to save.

That's how it describes DE 4136959 C2 a device that also heats and stores drinking water. When Zapfruhe this device forms a water cycle, are operated in the charge pump, drinking water heater and storage in the high temperature range.

The Cold water supply leads there at the charge pump and at the same time at the cold water inlet / outlet port of the accumulator. The heated Drinking water is taken from the hot water connection of the storage tank. In this device, however, the extracted hot water has a high temperature and can not be led directly to the taps become.

Known is also the integration of various storage areas, such as disinfection area and lace area, in a combination memory. The functionally different However, areas are also structurally separated there.

In DE 4235038 C2 a device is described based on the function of DE 4136959 C2 still contains the necessary cooling of the withdrawn hot water.

The the circuit of charge pump, drinking water heater and storage removed hot water is from the incoming cold water over a preheater / recooler at tapping temperature cooled.

described there are the integrations of circulation. These devices determine in different variations, especially the design of the Concerning circulation, the state of the art for drinking water heating.

In DE 10 2005 034 021 a device is described which, as in DE 4235038 C2 Heated drinking water, the necessary cooling to tapping temperature but before the peak storage performs.

Out In the prior art devices are also known which heated the Bring drinking water into two different temperature zones and there to save. A temperature zone lies in the disinfection area, the other below or equal to the tapping temperature. Both memory areas are located on the secondary side.

In DE 10034513 C2 a device is described, the circulation water is preheated and heated separately, then opens into the charging circuit in front of the memory and is partially recooled after the memory.

2 shows an exemplary conventional and well suited apparatus for DHW heating in the storage loading method. When using two different heat sources for DHW heating, for example, a boiler and a solar system, you can use two heat exchangers, as in 2 shown, order. The method is state of the art.

When tapping and pump off 3 In doing so, a tap volume flow driven by the external water pressure arises over the distance of the drinking cold water supply line 1 , Mixing point drinking water 2 B , to the drinking water storage 10C , for hot water drainage 11 and on to the external taps. This pushes incoming drinking cold water in the drinking water tank 10 stored domestic hot water via the hot water drainage 11 to the external taps.

When the drinking water reservoir cools down 10 the pump turns off 3 one. The result is a charge volume flow from the pump 3A via heat exchangers 5A and 5B , Heat exchanger 7A and 7B to the drinking water storage 10A and 10C , continue to the mixing point 2C and 2A and back to the pump 3B , This charge volume flow is superimposed in the range of the mix point 2 to the drinking water storage 10 the bleed volume flow.

If the bleed volume flow is greater than the charge volume flow, the drinking water storage tank becomes 10 discharged by incoming drinking cold water, in the opposite case it is charged by drinking hot water.

The heating of the drinking cold water in the charge volume flow takes place via the heat exchangers 5 and 7 , The heat energy relates to the heat exchanger 5 from an external first heat source, the heat exchanger 7 from an external second heat mequelle. The first heat source intentionally receives a lower return temperature than the second heat source. For heat sources with a return-temperature-dependent efficiency, such as solar systems, condensing boilers and some waste heat sources, the efficiency and energy costs decrease at low return temperatures.

In certain operating conditions, this device increases 2 the return temperature, however, strong. The reason for this is the circulation integration at the mixing point 12 , The warm circulation volume flow flows when the pump is switched off 3 from the mixing point 12C and 12A to the store 10B and pushes stored, heated and disinfected drinking water from the drinking water storage tank 10C to the taps. With the pump switched on 3 and smaller bleed volume flow as load volume flow, the warm load volume flow and circulation volume flow together from the potable water storage 10 and mixing point 12 to the mixing point 2C , There they mix with the cold tap flow and continue to flow from the mixing point 2A via the driving pump 3 to the heat exchanger 5A ,

At the mixing point 2 arises for the charge volume flow a significant increase in temperature compared to the cold tap flow. The now higher secondary temperature at the heat exchanger 5A causes a likewise higher primary temperature in the return of the heat exchanger 5D to the first external heat source. There a worse efficiency and rising energy costs follow. Thus, this device has a significant disadvantage.

From Based on this prior art, the invention has the object to create a device that is considerably more economical Operation regarding operating costs Drinking water heated and saves.

According to the invention this object is achieved by a device according to claims 1 and 2. Below, this device is based on the embodiment and the 1 be explained in more detail.

Of the basic idea of the solution according to the invention consists in that according to the prior art eliminate existing negative characteristics of the devices without changing the existing positive properties. This happens by the volume flow to be heated in two, according to temperatures ordered flow rates, is divided. With this device, the positive functions can be unchanged get and eliminate the negative function.

In this device after 1 occurs when tapping and pump off 3 a zap volume flow driven by the external water pressure over the distance drinking cold water supply line 1 , Mixing point drinking water 2 , by distribution point 13 , by mixing point 12 , through the drinking water storage 10B and 10C , for hot water drainage 11 and on to the external taps. This pushes incoming drinking cold water in the drinking water tank 10 stored domestic hot water via the hot water drainage 11 to the external taps.

When the drinking water reservoir cools down 10 the pumps are differentiated 3 and 14 one. There are two load volumes. A first cargo bulk subflow flows from the pump 3A , through the heat exchanger 5A and 5B to the mixing point 6B , A second cargo sub-stream flows from the pump 14A to the mixing point 6C ,

From the mixing point 6A the charge flow flows to the heat exchanger 7A and 7B , through the drinking water storage 10A and 10B , through the mixing point 12 to the distribution point 13A ,

In the distribution point 13 splits the charge volume flow. The first charging sub-volume flow flows from the distribution point 13B over the mixing point 2C and 2A to the driving pump 3B , the second charging sub-volume flow flows from the distribution point 13C to the driving pump 14B ,

The charging volume flow and the first loading part volume flow overlap the bleed volume flow. If the tap volume flow is greater than the load volume flow, the drinking water storage tank overflows 10B discharging incoming drinking cold water, in the opposite case it will be via connection 10A incoming drinking warm water loaded.

The heating of the drinking cold water in the charge volume flow takes place via the heat exchangers 5 and 7 , The heat energy relates to the heat exchanger 5 from an external first heat source, the heat exchanger 7 from an external second heat source. The first heat source intentionally receives a lower primary return temperature than the second heat source. For heat sources with a return-temperature-dependent efficiency, such as solar systems, condensing boilers and some waste heat sources, the efficiency and energy costs decrease at low return temperatures.

The differentiation of the charging sub-volume flows for this reason is temperature-dependent. The first charging part volume flow is formed by the volume flows in the cold temperature level. This includes the bleed volume flow and at times the egg a cold drinking water storage tank 10 to the distribution point 13 flowing load flow. In the distribution point 13 the first charging sub-volume flow splits off and flows to the mixing point 2C , There, they mix with the cold tap volume flow and flow as the first charging part volume flow to the pump 3B ,

The second charging part volume flow is formed by the volume flows in the warm temperature level. This includes the over the mixing point 12 Incorporating circulation volume flow and temporarily from a warm drinking water storage tank 10B flowing load flow, in the distribution point 13B divided to the second charging part volume flow to the pump 14B flows.

With this device is achieved, that on the heat exchanger 5A always a volume flow occurs in the cold temperature range. This causes a likewise cold primary volume flow in the return of the heat exchanger 5D to the first external heat source. There, this cold return flow causes a better efficiency and subsequent falling energy costs.

In order to this device has a considerable advantage. The operating costs this device according to the invention for drinking water heating are significantly lower than the devices of the prior art are known.

1

Drinking cold water supply line

2

Mixing point / distribution point

3

pump Charging partial volume flow

5

Heat exchanger heat source 1

6

Mixing point / mixing valve

7

heat exchangers heat source

10

drinking water storage

11

water drainage

12

mixing point circulation water

13

distribution point

14

pump Charging partial volume flow

15

entrance circulation water

16

pump Charge volume flow

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 4136959 C2 [0005, 0008]
• - DE 4235038 C2 [0008, 0011]
• - DE 102005034021 [0011]
• - DE 10034513 C2 [0013]

Claims (2)

Device for heating and storing drinking water with a cold water supply line 1 , a circulation feeder 15 , a hot water drainage 11 , three pumps 3 . 14 and 16 , two heat exchangers 5 and 7 , a store 10 , a blending point 12 , a distribution point 13 , a mixing point / distribution point 2 and a mixing point / mixing valve 6 , characterized in that a first distance of mixing / distribution point ( 2 ), connected to pump ( 3 ), connected to secondary side heat exchanger ( 5 ) and connected to mixing point ( 6 ), and in parallel a second one of distribution point ( 13 ), connected to pump ( 14 ) and connected to mixing point ( 6 ), at the mixing point ( 6 ) and recirculated directly via secondary side heat exchangers ( 7 ), Drinking water storage ( 10 ) to the distribution point ( 13 ) and mixing point / distribution point ( 2 ) are connected. Device according to claim 1, characterized in that the mixing point ( 6 ) is a mixing valve and with the elimination of the pump ( 3 ) the mixing / distribution point ( 2 ) directly with heat exchanger ( 5 ) and with the elimination of the pump ( 14 ) the distribution point point ( 13 ) directly with mixing point ( 6 ) and between mixing valve ( 6 ) and heat exchangers 7 a pump ( 16 ) is arranged.