DE3037446A1 - Heating system with solar collector - has buffer storage vessel heatable by heat pump transfer device - Google Patents

Abstract

The heating system has a buffer storage vessel supplied by a solar heat collector, a primary heat pump supplied with environmental energy, and an additional boiler, with a common heat consumer system connected by valves to both. The buffer storage vessel can be brought into heat-exchange with the primary heat-transfer device of the heat pump, when it is cut off from the direct heat consumer circuits. In the storage vessel there can be a useful-heat-transfer device, which can be connected in the primary circuit of the heat-pump primary heat-transfer device.

Description

K-168 09/30/1980

Bt / gf

KÜPPERSBUSCH AKTIENGESELLSCHAFT Gelsenkirchen

Heating device

The invention relates to a heating device according to the preamble of the first claim.

In a known heating device of this type (DE-OS 26 38 357) the secondary heat exchanger is the heat pump connected in series with the storage tank, from which a flow line leads to the heat consumer. The return line is connected to the inlet of the secondary heat exchanger of the heat pump via valves tied together. As soon as the heat pump supplies heat, the heated water is stored in the buffer tank directed. After switching on the heat pump is usually only done when the solar collector does not provide a sufficient amount of heat and therefore room heating is only possible with that supplied by the heat pump If hot water is possible, the heat transport from the solar collector to the buffer storage must be interrupted.

K-168 3Qo09.i980

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because otherwise at least part of the heat generated by the heat pump would be dissipated via the solar collector circuit _o

The invention is based on the object of providing a heating device according to the preamble of the first claim create that enables the heat generated by the solar collector to be used even when the heat pump is in operation.

This object is achieved according to the invention by the characterizing features of the first claim.

In the embodiment according to the invention, if there is sufficient heat generation by the solar collector, over the buffer storage of the heating circuit of the heat consumer are fed directly · On the other hand, provides a direct Use of the heat from the collector no longer has a heating effect, so the amount of heat generated by the solar collector is sufficient does not cover the heat demand and is the temperature level Too low for heating, then the amount of heat generated by the solar collector can be used primary heat exchangers of the heat pump, where they are brought to a temperature level sufficient for heating purposes is raised. A circuit can be implemented in a simple manner and in connection with a conventional one Heat recovery system readily applicable =

Advantageous embodiments of the invention are specified in the further claims.

K-168 30 September 1980

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The invention is explained in more detail below with the aid of the basic sketches of exemplary embodiments.

Show it:

Figure 1 shows a heating device with indirect heat coupling between the solar circuit and the feed circuit of the heat pump,

Figure 2 shows a heating device with direct thermal coupling between the solar circuit and the Heat pump feed circuit and

FIG. 3 shows a heating device according to FIG. 1 with a domestic water storage tank fed from the solar circuit

A solar collector 1 or solar convector is connected to a liquid heat transfer medium via pipes 2 Solar circuit switched on, which contains a solar heat exchanger. The solar heat exchanger 3 is located in the lower Section of a buffer storage tank 4, in the upper section of which an additional useful heat exchanger 5 is arranged is. From the top of the buffer tank 4 also leads a flow line 6 to a first connection of a three-way valve 7, the second connection Via an intermediate line 8 to a fourth connection of a four-way valve 9 and its third connection via a Flow line 10 is led to the output of an auxiliary boiler 11. A common return line 12 for the Boiler 11 and the buffer tank 4 is connected to a third Connection of the four-way valve 9 placed, while at its first connection a flow line 13 is guided out which radiators 14 and 15 are fed as heat consumers for room air or floor heating. One

K168 09/30/1980

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common return line 16 of the radiators 14, 15 is connected to the input of a secondary heat exchanger 17 of a heat pump 18, the output of which has a Pipeline 19 is connected to the second connection of the four-way valve 9. A primary heat exchanger 20 the heat pump 18 is fed with a heat transfer medium via a feed pump 21 and an inlet line 22, that extracts heat from outside air, the ground or a water reservoir. In the feed line 22 is a shut-off valve 2 3 placed, to which the useful heat exchanger 5 is parallel via pipes 24. The heat transfer medium flows from the primary heat exchanger 20 via a discharge line 25. Incidentally, one takes care of Circulation pump 26 in the flow line 13 for circulation of the heat transfer medium in the heating circuit and a feed pump 27 for the transport of a heat transfer medium in the solar cycle.

When the sun is shining, the heat transfer medium leaves the solar collector 1 with a relatively high temperature, by a Thermostat 28 is detected, and gives its heat via the solar heat exchanger 3 in the lower cold area to the Buffer 4 from. If the temperature detected by a thermostat 29 at the top of the buffer tank 4 is reached by the solar heat exchanger 3 heated heat transfer medium in the heating circuit is sufficient for room heating The value that is preset by a thermostat 32 on the flow line 13 is then set at the three-way valve 7 the first connected to the second connection, so that when heat is required via the fourth and first connection of the four-way valve 9, the heat transfer medium to the radiators 14, 15 can be promoted. Involvement of the

K-168 09/30/1980

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Heat pump 18 is not required, so that over the return lines 16, 19, 12 of the heating circuit without additional heating is closed. The room is then heated exclusively by solar heat.

If, on the other hand, the temperature in the buffer store 4 falls below a value specified by the thermostat 29 and becomes the Heating energy is requested, then the heat pump 18 is switched on and the four-way mixing valve 9 is open for its first and second connection. At the same time the feed pump 21 is started, whereby the primary heat exchanger 20 of the heat pump 18 with the heat transfer medium preheated from air, water or soil is applied. The useful heat exchanger 5 is also located in this feed heat transfer medium circuit, if the shut-off valve 23 is closed. The heat still supplied by the solar collector is then transferred to the buffer store 4 withdrawn and "fed via the heat pump 18 to the heating circuit. Switching on the useful heat exchanger 5 is useful as long as the temperature of the heating circuit Heat transfer medium in the buffer store 4 higher than the temperature of the feed heat transfer medium circuit on Input of the primary heat exchanger 20 is. For this purpose, a thermostat 30 is provided at this input, which then the shut-off valve 23 opens when the temperature detected by it is higher than that at the thermostat 29. Through this the flow resistance in the feed heat transfer medium circuit is reduced. Of course it is also possible directly the heating circuit heat transfer medium from the buffer store 4 in the feed heat transfer medium circuit to introduce. The same applies to the solar circuit

K-168 30.09ol980

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run to. The heat exchangers 3 may then be omitted or 5. If the temperature of the solar circuit heat transfer medium detected by the thermostat 28 falls below the of one arranged in the lower region of the buffer store 4 Thermostat 31 detected temperature, so that heat could get into the solar circuit, then the Feed pump 27 switched off. It is thus also possible to transfer the amount of heat supplied by the solar collector 1 to the heating circuit To feed the solar circuit up to a relatively low temperature level without the need for expensive electrical or having to provide mechanical circuits or to significantly redesign an existing heating system. This heating system with the boiler 11 is when the three-way valve 7 is switched to the second and third connection already fully operational.

According to Figure 2, the solar heat exchanger 3 is not only placed in the pipeline 2, but at the same time parallel connected to the pipes 24, so that the useful heat exchanger 5 and the thermal energy are omitted can be fed from the solar circuit directly into the feed heat transfer medium circuit of the heat pump 18.

Finally, according to FIG. 3, a domestic water heat exchanger 33 is connected in parallel with the solar heat exchanger 3, which is primarily used at high temperatures in the solar circuit is switched on via a thermostat 34. The domestic water heat exchanger 33 and the thermostat are assigned to a domestic water tank 35.

K-168 09/30/1980

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In this structure, solar energy is used in a multivalent heating and domestic water system possible, whereby for economic reasons and to save primary energy types the sequence is preferred Solar collector, heat pump and additional boiler as heat sources can be achieved by a simple circuit. The content of the buffer memory can preferably be dimensioned so that on the one hand the switching intervals. are not too frequent, on the other hand they are often enough There is a possibility for the use of solar heat. If the buffer memory is too large, then valuable ones come in short-term exposure to the sun is not immediately effective. The buffer storage, however, can also be designed as large that the solar heat is stored over a longer period of time, e.g. in the summer and autumn months is so that the heat pump operated more economically and the use of primary energy on one Min-imum can be limited.

L e r s e i t e

Claims (5)

Κ-168 09/30/1980 Bt / gf claims 1.) Heating device with one of a solar collector fed buffer storage, with a primarily from environmental energy fed heat pump and an additional boiler, to which a common heat consumer via valves • is connected, characterized in that the buffer store (4) in heat exchange with the primary heat exchanger (20) of the heat pump (18) can be brought and thereby from the direct heat circuit of the heat consumer (14, 15) is switched off. 2. Heating device according to claim 1, characterized in that a useful heat exchanger (5) is arranged in the buffer store (4) which can be switched into the primary circuit (22, 25) of the primary heat exchanger (20) of the heat pump (18) . 3. Heating device according to claim 1 or 2, characterized in that that a shut-off valve (23) is placed in the feed line (22) and that the feed line (22) a pipe connection (24) of the useful heat exchanger (5) is connected in front of and behind the shut-off valve (23). 4. Heating device according to claim 1 or one of the following, characterized in that the useful heat exchanger (5) is in heat exchange connection with the solar collector (1). Κ-168 '09/30/1980 Bt / gf 5. Heating device according to claim 1 or one of the following, characterized in that the secondary heat exchanger (17) of the heat pump (18) in the return line (16) of the heat consumer (14, 15) is connected that the Flow lines (6, 10) of the buffer tank (4) and one Additional boiler (11) are each connected to one connection of a three-way valve, the third connection of which is connected to a connection of a four-way valve (9) and that the flow lines (19, 13) of the secondary heat exchanger (17) and the heat consumer (14, 15) each placed on a further connection of the four-way valve (9) are, at its fourth connection the return line (12) to the additional boiler (ll) and to the buffer tank (4) is connected. BATH ORIGINAL