JP2002267263A - Heat recovery and cogeneration systems - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the efficiency by directly using heat from a heat source without passing through a hot water storage tank. SOLUTION: By circulating a heat medium heated by the exhaust heat of a gas engine 1 through a first heat exchanger 4 provided in a hot water storage tank 3, the exhaust heat recovered from the gas engine 1 is reduced. In a system in which heat is radiated by the first heat exchanger 4 and stored in the hot water storage tank 3, a second heat exchanger 12 is provided in a circulation path of the heat medium to heat the bathtub water to heat or reheat the bath. I'm trying to do it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat recovery system for recovering heat generated by a heat source and a cogeneration system including the same.

[0002]

2. Description of the Related Art As a conventional heat recovery system, for example,
A heat exchanger in which a heat medium heated and supplied by exhaust heat from a heat source such as an engine generator is supplied and circulated is installed in a hot water storage tank,
There is a system in which the low-temperature water is heated and stored by heat exchange between the heat medium and the low-temperature water in the hot water storage tank by the heat exchanger, and the stored hot water is supplied to a bath as needed.

[0003]

As described above, conventionally, the heat from the heat source is temporarily stored in the hot water storage tank and then supplied to the bath. Therefore, the heat from the heat source is directly transferred to the bath. It could not be used for hot water supply or reheating, and was inefficient.

The present invention has been made in view of the above points, and has as its object to increase the efficiency by allowing heat from a heat source to be used directly without passing through a hot water storage tank.

[0005]

In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, the heat recovery system according to the first aspect of the present invention circulates the heat medium heated by the heat generated by the heat source through the first heat exchanger provided in the heat storage tank. , The heat recovered from the heat source,
In a heat recovery system in which heat is radiated by a heat exchanger and heat is stored in the heat storage tank, a second heat exchanger is provided in a circulation path that returns the heat medium from the heat source to the heat source to supply heat to other than the heat storage tank. It is possible.

According to the first aspect of the present invention, a second heat exchanger is provided in a circulation path for returning the heat medium heated by the heat generated by the heat source from the heat source to the heat source, except for the heat storage tank. Since the heat can be supplied to the second heat exchanger, the heat from the heat source can be directly recovered and used by the second heat exchanger without passing through the heat storage tank.

According to a second aspect of the present invention, in the first aspect of the present invention, the second heat exchanger is provided with the first heat exchanger from the heat source.
Downstream of the heat source in the circulation path leading to the heat exchanger,
The first heat exchanger is provided upstream of the first heat exchanger.

According to the second aspect of the present invention, since the second heat exchanger is disposed upstream of the first heat exchanger in the heat storage tank, the second heat exchanger is heated by the heat generated by the heat source. Before the heat of the medium is taken off by the first heat exchanger, it can be efficiently recovered by the second heat exchanger.

According to a third aspect of the present invention, in the first or second aspect, the second heat exchanger uses the heat medium as a first heat medium and exchanges heat with the first heat medium. The second heating medium communicates with a circulation heating circuit that circulates.

According to the third aspect of the present invention, in the circulation heating circuit, the second heat medium which exchanges heat with the first heat medium can be circulated and heated, and By using bath water or hot water for heating, it can be used for heating, reheating or heating the bath.

According to a fourth aspect of the present invention, in the third aspect of the present invention, an auxiliary heat source for heating the second heat medium is disposed in the circulation heating circuit.

According to the fourth aspect of the present invention, when the temperature of the second heat medium heated by heat exchange with the first heat medium in the second heat exchanger does not reach a desired temperature. The second heat medium can be heated to a desired temperature by the auxiliary heat source.

According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, the circulation heating circuit is provided with a bypass path bypassing the second heat exchanger, and the bypass path is provided with the heat storage A third heat exchanger disposed in the tank is provided, and switching means for switching the flow path of the second heat medium of the circulation heating circuit to the second heat exchanger side or the bypass path side is provided. .

According to the fifth aspect of the present invention, the second
Since the third heat exchanger disposed in the heat storage tank is provided in the bypass path that bypasses the heat exchanger, for example, when a heat source such as a gas engine stops and heat cannot be used, By switching the flow path of the second heat medium to the bypass path side, the heat stored in the heat storage tank can be effectively used.

According to a sixth aspect of the present invention, in accordance with the fifth aspect of the present invention, there is provided a first temperature detecting means provided in the heat storage tank, and a second temperature detecting means provided in the circulating heating circuit. The switching means switches the flow path based on the detection outputs of the two detection means.

According to the present invention, since the flow path is switched based on the detection output of the temperature detecting means, for example, when the heat is sufficiently stored in the heat storage tank and the temperature is high, By switching the flow path to the bypass path side, the heat stored in the heat storage tank can be effectively used.

According to a seventh aspect of the present invention, there is provided a cogeneration system according to any one of the first to sixth aspects, wherein the heat generated by the heat source is heat generated by an engine.

According to the present invention, while it is possible to perform power generation and the like by the power of the engine, it is possible to recover and use the heat generated by the engine, and to improve the efficiency of energy use. it can.

An eighth aspect of the present invention provides a cogeneration system according to any one of the first to sixth aspects, further comprising a starting power supply for starting the heat source at the time of a power failure.

According to the present invention, even at the time of a power failure, a heat source such as an engine can be started by using a starting power source such as a battery or a capacitor to generate electric power. Moreover, if the temperature of the heat storage tank rises too much due to the continuous power generation during the power failure and the return temperature of the heat medium to the engine rises above a certain temperature, the engine cannot be cooled and the engine must be stopped. However, since the second heat exchanger for supplying heat to a portion other than the heat storage tank is provided in the circulation path of the heat medium, the heat of the heat medium is radiated through the second heat exchanger to return to the engine. By lowering the temperature, the engine can be operated continuously.

According to a ninth aspect of the present invention, there is provided the heat recovery system according to any one of the third to sixth aspects.
The heat medium is hot and cold water in a bathtub.

According to the ninth aspect of the present invention, heat from a heat source such as an engine is transferred to the second
The heat can be directly recovered by the heat exchanger and used for heating and reheating the bath.This improves efficiency and reduces the size of the heat storage tank compared to the conventional case where it is once stored in the heat storage tank and then poured into the bath. Can be planned.

A heat recovery system according to a tenth aspect of the present invention includes the cogeneration system according to the seventh or eighth aspect, wherein the second heat exchanger uses the heat medium as the first heat medium and the first heat medium as the first heat medium. The second heat medium communicates with a circulation heating circuit in which a second heat medium that exchanges heat with the heat medium circulates, and the second heat medium is hot water in a bathtub.

According to the tenth aspect of the present invention, while it is possible to generate power or the like by the power of an engine or the like as a heat source, heat from the heat source can be transferred without passing through a heat storage tank.
It can be directly recovered by the second heat exchanger and used for heating and reheating the bath. This improves the efficiency and reduces the size of the heat storage tank compared to the conventional case where it is once stored in the heat storage tank and then poured into the bath. Can be achieved.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below based on embodiments shown in the drawings.

Embodiment 1 FIG. 1 is a schematic configuration diagram of an automatic bath system using a gas engine cogeneration system according to one embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a gas engine having a power generation function as a heat source. Electricity generated by the gas engine 1 is supplied to a domestic load of a general household in which the automatic bath system is installed. You.

Reference numeral 2 denotes exhaust heat from the gas engine 1, for example,
The first heat exchanger 4 is a waste heat recovery circuit in which a first heat medium such as antifreeze heated by water cooling of the gas engine and exhaust gas of the gas engine circulates, and is installed inside the hot water storage tank 3 which is a heat storage tank. And a circulation pump 5 are provided.

A water supply pipe 7 is provided at a lower water supply port of the hot water storage tank 3.
On the other hand, a hot water outlet pipe 8 is connected to the upper hot water outlet, and the hot water from the hot water storage tank 3 is mixed with the hot water from the hot water supply pipe by the mixing valve 9 so that the hot water supply heat exchanger 10
It is configured to be supplied with hot water through the hot water.

In this system, the gas engine 1 is driven, and the circulating pump 5 of the exhaust heat recovery circuit 2 is driven so that the first heat medium from the gas engine 1 is subjected to the first heat exchange as indicated by the arrow. By circulating through the heat exchanger 4, the exhaust heat recovered from the gas engine 1 is radiated by the first heat exchanger 4 to heat the low-temperature water in the hot water storage tank 3 and store the heat. 3. The warm water stored in 3
Hot water is supplied to the auxiliary heat source device 6 via the hot water supply pipe 8, and is supplied to the hot water storage tank 3 from the water supply pipe 7.

Conventionally, the low-temperature water in the hot water storage tank 3 is heated and temporarily stored by the waste heat recovered from a heat source such as a gas engine and then poured into the bathtub 11. There was a drawback that the hot water could not be poured if the heat was not sufficiently stored.

Therefore, in this embodiment, a circulation path for returning the first heat medium heated by the exhaust heat of the gas engine 1 from the gas engine 1 to the gas engine 1, in this example, the exhaust heat recovery circuit 2 A second heat exchanger 12 is provided downstream of the gas engine 1 and upstream of the first heat exchanger 4 to enable heat to be supplied to components other than the hot water storage tank 3.

The second heat exchanger 12 communicates with a circulation heating circuit 13 in which bathtub water as a second heat medium that exchanges heat with the first heat medium in the second heat exchanger 12 circulates. The circulating heating circuit 13 is provided with the bath heat exchanger 1 in the auxiliary heat source 6.
4, a bath pump 15 and a bathtub 11, and the circulating heating circuit 13 is connected to a hot water supply pipe 17 via a pouring solenoid valve 16.

The auxiliary heat source 6 controls the stop of driving of the gas engine 1 in accordance with the output of various sensors such as a water level sensor (not shown) and the setting operation from a remote controller 18 for remotely controlling the auxiliary heat source 6. , A controller 19 for controlling each part is built-in.

In this embodiment, the hot water stored in the hot water storage tank 3 is not poured into the bathtub 11 as in the prior art.
First, water is supplied to the bathtub 11 without being heated by the hot-water supply heat exchanger 10 from the hot-water supply pipe 17 via the hot-water supply electromagnetic valve 16 and filled with water. Next, the water in the bathtub 11 is circulated by the bath pump 15 in the auxiliary heat source 6 as shown by the arrow,
By driving the gas engine 1 and driving the circulation pump 5 to circulate the first heat medium, the second heat exchanger 12 heats the first heat medium and the bathtub water heated by the exhaust heat of the gas engine 1. Is used to heat the bathtub water by exchanging heat to heat and reheat the bath.

For example, in the case of heating a bath, when the heating is instructed by the remote controller 18, the water of the set water level is filled in the bathtub 11 under the control of the controller 19, and the bath pump 15 in the auxiliary heat source device 6. Is driven to circulate bath water, while the gas engine 1 and the circulation pump 5 are driven to circulate the first heat medium heated by the exhaust heat of the gas engine 1 and the bath heat is circulated by the second heat exchanger 12. It is heated and heated to the set temperature.

When the bath is to be heated at the reserved time, the desired time of the bath to be used is set by the remote controller 18 for reservation. The controller 19 of the auxiliary heat source unit 6 detects the presence or absence of residual water in the bathtub 11, and if there is residual water, calculates the residual water amount by calorific value calculation or the like, and on the other hand, it is installed in the auxiliary heat source unit 6 (not shown). The incoming water temperature is detected by an incoming water temperature thermistor.

Next, the controller 19 starts the bath at the reserved time based on the capacity of the second heat exchanger 12, the bathtub capacity, the presence / absence of the remaining water, the incoming water temperature, etc., which are set and stored in advance. In order to raise the temperature, it is necessary to calculate the time when the water injection should be started and the heating to be started. At the calculated time, water is injected into the bathtub 11 at the set water level, and the bath pump in the auxiliary heat source unit 6 is provided. 15 is driven to circulate bathtub water, while the gas engine 1 and the circulation pump 5 are driven to circulate the first heat medium heated by the exhaust heat of the gas engine 1, and the bathtub water is circulated by the second heat exchanger 12. Is heated to a set temperature.

When it is determined from the result of the reverse calculation that the capacity of the second heat exchanger 12 alone cannot be used at the reserved time, the controller 19 uses the bath heat exchanger 14 in the auxiliary heat source unit 6 in combination. Boil up. Also in the case of reheating, the heating by the bath heat exchanger 14 may be used together with the heating of the bathtub water by the second heat exchanger 12.
Further, the bath heat may be heated by the bath heat exchanger 14 alone.

As described above, without going through the hot water storage tank 3,
Since the heat of the first heat medium heated by the exhaust heat of the gas engine 1 is directly used by the second heat exchanger 12 to heat and reheat the bath, the efficiency can be increased as compared with the conventional example. .

Further, conventionally, as described above, the hot water is poured into the bath after it is once stored in the hot water storage tank 3, so that the hot water storage tank 3 needs to be large enough to store the amount of heat required for pouring the bath. Met.

For example, assuming that the set temperature of the bath is 40 ° C. and the capacity of the bathtub is 200 liters, as shown in Table 1, the hot water storage temperatures are 80 ° C., 70 ° C., 60 ° C., and the incoming water temperature is 5 ° C. , 15 ° C., the hot water storage volume required for bath pouring is about 100 liters.

[0044]

[Table 1] On the other hand, in this embodiment, the pouring of the bath
Since the hot water in the hot water storage tank 3 is not used, it is not necessary to store the amount of heat required for pouring the bath in the hot water storage tank 3, and the hot water storage tank 3 can be reduced in size by, for example, about 100 liters.

(Embodiment 2) FIG. 2 is a schematic configuration diagram of a hot water heating system using a gas engine cogeneration system according to another embodiment of the present invention, and a portion corresponding to the above-described embodiment. Are given the same reference numerals.

In this embodiment, similarly to the above-described embodiment, electricity generated by the gas engine 1 having a power generation function as a heat source is supplied to a household load of a general household in which the hot water heating system is installed. The first heat medium from the gas engine 1 is circulated through the first heat exchanger 4 by the circulation pump 5 of the exhaust heat recovery circuit 2 so that the exhaust heat recovered from the gas engine 1 Is dissipated by the first heat exchanger 4 to heat the water in the hot water storage tank 3 to store heat.

Further, the gas engine 1 of the exhaust heat recovery circuit 2
A second heat exchanger 12 that is capable of supplying heat to a portion other than the hot water storage tank 3 is provided further downstream than the first heat exchanger 4.

In this embodiment, the second heat exchanger 12
Communicates with the circulation heating circuit 13 ₁ heating hot water is circulated as a second heating medium to heat exchange between the first heating medium,
The circulating heating circuit 13 ₁ includes a heating heat exchanger 20 of the auxiliary heat source unit 6 in _1, and heating pump 21, which connects the heating terminal 22, such as a fan convector or floor heating.

[0049] Further, in this embodiment, the circulation heating circuit 13 _1, provided with a bypass passage 23 which bypasses the second heat exchanger 12, to the bypass path 23, first placed in the hot water storage tank 3 Three heat exchangers 24 are provided.

[0050] Further, a three-way valve 25 constituting the flow path for the heating hot water circulation heating circuit 13 _1, a switching means for switching to the second heat exchanger 12 side or the bypass path 23 side.

[0051] The hot water storage tank 3, while the first thermistor 26 as first temperature detecting means for detecting the temperature is installed, the circulation heating circuit 13 ₁ of the auxiliary heat source unit 6 in the _first, second temperature sensing A second thermistor 27 is provided as a means.

[0052] In this embodiment, when the gas engine 1 and the circulation pump 5 is driven, the controller 19 _first auxiliary heat source unit ₆₁ is a three-way valve 25, connected to the second heat exchanger 12 side At this time, the auxiliary heat source 6
The heating pump 21 in ₁ is driven to circulate hot water for heating as shown by the solid line arrow, and is heated by the second heat exchanger 12 by the first heat medium heated by the exhaust heat of the gas engine 1. The heating operation is performed by heating the hot water and supplying and circulating it to the heating terminal 22.

When the temperature of the hot water in the hot water storage tank 3 is higher than a predetermined temperature based on the detection output of the first thermistor 26 when the gas engine 1 and the circulation pump 5 are stopped, the controller 19 ₁ is a three-way valve 25
Is switched to the bypass path 23 side.

As a result, the heating hot water is heated by the third heat exchanger 24 in the hot water storage tank 3 by exchanging heat with the high-temperature water in the hot water storage tank 3, as indicated by the dashed arrow. The heating operation is carried out by being supplied to and circulated to the heating device 22.

As described above, when the gas engine 1 is stopped and the exhaust heat of the gas engine 1 cannot be recovered and the hot water tank 3 is sufficiently stored, the circulation path of the heating hot water is shifted to the bypass path 23 side. The heating operation is performed by switching and exchanging heat with the high-temperature water in the hot water storage tank 3 via the third heat exchanger 24.

[0056] Further, in the heat exchanger or heat exchange with the first heat medium of high temperature water in the hot water storage tank 3, if the heating hot water does not reach the predetermined temperature, i.e., the second thermistor 27 of the auxiliary heat source unit 6 in ₁ If the detected temperature does not reach the predetermined temperature, the heating heat exchanger 20 is used to heat the heating hot water.

(Embodiment 3) FIG. 3 is a schematic configuration diagram of an automatic bath system using a gas engine cogeneration system according to still another embodiment of the present invention, and corresponds to Embodiment 1 described above. The same reference numerals are given to the same parts.

In this embodiment, a battery 28 is provided as a starting power supply so that the gas engine 1 can be started in the event of a power outage, while an electric heater for heating water in the hot water storage tank 3 with electricity generated by the gas engine 1 is provided. 29 are provided.

Conventionally, the gas engine 1 cannot be started at the time of a power failure because it is started by the commercial power supply. However, in this embodiment, the gas engine 1 is started even at the time of the power failure because the battery 28 is provided. be able to. Note that a capacitor or another power source may be used instead of the battery 28.

By starting the gas engine 1 at the time of a power outage, electricity can be supplied to a required load in the house, and electricity is supplied to the auxiliary heat source 6 and the circulating pump 5 to be recovered from the gas engine 1. The exhaust heat can be radiated by the first heat exchanger 4 to heat the low-temperature water in the hot water storage tank 3 to store the heat. Heating by the electric heater 29 is performed when necessary other than during a power failure, and at the time of a power failure, electricity generated by the gas engine 1 is preferentially supplied to a domestic load.

If the temperature of the water in the hot water storage tank 3 becomes too high due to the continuous operation at the time of the power failure, the return temperature of the first heat medium to the gas engine 1 becomes high and the gas engine 1 cannot be cooled. In the embodiment, hot water supply tank 8 is connected to hot water supply pipe 8.
While the hot water is supplied via the water supply pipe 7 while the hot water is supplied to the hot water storage tank 3, the heat of the hot water storage tank 3 is radiated, or as in the first embodiment, the bath is heated or reheated. Is performed to release the heat of the first heat medium in the second heat exchanger 12, so that the return temperature of the first heat medium to the gas engine 1 can be prevented from becoming high.
Continuous operation becomes possible.

Other configurations and effects are the same as those of the first embodiment.

(Other Embodiments) In each of the above-described embodiments, the first heat medium is circulated from the gas engine 1 via the first heat exchanger 4 so that bath water and the like are circulated by the second heat exchanger 12. Although it is heated, as another embodiment of the present invention, for example, as shown in FIG. 4, when exhaust heat is recovered by the second heat exchanger 12, the first heat exchanger 4 is bypassed. The exhaust heat may be recovered by circulating the first heat medium through the passage 30.

As another embodiment of the present invention, the above-described embodiments may be appropriately combined. For example, the above-described second embodiment may be provided with the electric heater 29 of the third embodiment. The bypass path 23, the third heat exchanger 24, and the like of the second embodiment may be provided in the first and third embodiments.

Further, the present invention may have a configuration in which a hot water heating system is provided in addition to the bath system including the bath kettle with the automatic water heater as in the first embodiment.

In the third embodiment, the gas engine 1
Although the water in the hot water storage tank 3 is heated by the electric heater 29 using the electric power obtained by the power generation of the gas engine 1, as another embodiment of the present invention, the electric power obtained by the power generation of the gas engine 1 is used. An electric heater for heating the first heat medium or the second heat medium may be provided.

In each of the embodiments described above, the exhaust heat of the gas engine is recovered. However, as another embodiment of the present invention, the exhaust heat of another generator such as a fuel cell may be recovered. Alternatively, not only the exhaust heat but also the heat of the boiler or other heat sources may be recovered.

[0068]

As described above, according to the present invention, the second heat exchanger is provided in the circulation path for returning the heat medium heated by the heat of the heat source from the heat source to the heat source, so that the heat medium can be transferred to other than the heat storage tank. Since the heat supply is enabled, the heat from the heat source is directly recovered by the second heat exchanger without passing through the heat storage tank, for example,
It can be used for heating bathtub water or hot water for heating, and the efficiency can be increased as compared with the conventional example.

Further, according to the present invention, the third path disposed in the heat storage tank is provided in the bypass path bypassing the second heat exchanger.
If the heat from the heat source cannot be used because the heat exchanger is provided, the heat stored in the heat storage tank should be used effectively by switching the flow path to the bypass path side and selecting it. Can be.

Further, according to the present invention, even during a power failure, the engine can be started by using a starting power source such as a battery or a capacitor to generate electric power, and the circulation path of the heat medium heated by the heat of the engine can be obtained. Is provided with a second heat exchanger for supplying heat to a part other than the heat storage tank, so that the heat of the heat medium is radiated through the second heat exchanger to lower the return temperature to the engine, thereby reducing the engine temperature. Continuous operation becomes possible.

Further, according to the present invention, heat from a heat source such as an engine can be directly recovered by the second heat exchanger without passing through a heat storage tank, and can be used for heating or reheating a bath. The capacity of the tank can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an automatic bath system using a gas engine cogeneration system according to Embodiment 1 of the present invention.

FIG. 2 is a schematic configuration diagram of a hot water heating system using a gas engine cogeneration system according to Embodiment 2 of the present invention.

FIG. 3 is a schematic configuration diagram of an automatic bath system using a gas engine cogeneration system according to Embodiment 3 of the present invention.

FIG. 4 is a schematic configuration diagram of an automatic bath system using a gas engine cogeneration system according to a further embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Gas engine 2 Exhaust heat recovery circuit 3 Hot water storage tank 4 First heat exchanger 5 Circulation pump 6,6 ₁ Auxiliary heat source device 11 Bathtub 12 Second heat exchanger 22 Heating terminal 19,19 ₁ Controller 23 Bypass path 24 Third heat Exchanger 25 Three-way valve 28 Battery

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) F02G 5/04 F02G 5/04 T F24H 9/20 F24H 9/20 B (71) Applicant 000221834 Toho Gas Co., Ltd. Co., Ltd. 19-18, Sakuradacho, Atsuta-ku, Nagoya-shi, Aichi, Japan (71) Applicant 000196680 Seibu Gas Co., Ltd. 1-17-1 Chiyo, Hakata-ku, Fukuoka, Fukuoka (72) Inventor Tatsuro Arai Edo, Chuo-ku, Kobe, Hyogo 93, Machi-no-machi, Inc. (72) Inventor Takuji Saeki 93, Edo-cho, Chuo-ku, Kobe, Hyogo Prefecture Co., Ltd. (72) Inventor Kazuki Suzuki 1-5-20 Kaigan, Minato-ku, Tokyo Inside Tokyo Gas Co., Ltd. (72) Kenichi Tanogashi 1-cho, Minato-ku, Tokyo No. 5-20 Tokyo Gas Co., Ltd. (72) Kazuya Yamaguchi 1-chome, Minato-ku, Tokyo 5-20 No. 20 Tokyo Gas Co., Ltd. (72) Yoshitaka Kayahara 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. 1-2 Inside Osaka Gas Co., Ltd. (72) Shin Iwata, Inventor 4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Inside (72) Inventor Keiji Takimoto Hirano, Chuo-ku, Osaka-shi, Osaka In-house Osaka Gas Co., Ltd. 4-1-2, Tachio Sugawara Inventor Tadao Sugawara 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture In-house Osaka Gas Co., Ltd. (72) Inventor Kazuhiro Matsumoto 1-17-21 Chiyo, Hakata-ku, Fukuoka City, Fukuoka Prefecture Inside Seibu Gas Co., Ltd.

Claims (10)

[Claims] 1. A heat medium heated by heat generated by a heat source is circulated through a first heat exchanger provided in a heat storage tank, so that heat recovered from the heat source is transferred to the first heat exchanger. In a heat recovery system in which heat is radiated by an exchanger and stored in the heat storage tank, a second heat exchanger is provided in a circulation path for returning the heat medium from the heat source to the heat source, so that heat can be supplied to parts other than the heat storage tank. A heat recovery system characterized by: 2. The heat recovery system according to claim 1, wherein the second heat exchanger is located downstream of a heat source in a circulation path from the heat source to the first heat exchanger, and the first heat exchanger is provided with a first heat exchanger. A heat recovery system provided upstream of the exchanger. 3. The heat recovery system according to claim 1, wherein the second heat exchanger uses the heat medium as a first heat medium and exchanges heat with the first heat medium. A heat recovery system, which is in communication with a circulation heating circuit through which a medium circulates. 4. The heat recovery system according to claim 3, wherein an auxiliary heat source for heating the second heat medium is disposed in the circulation heating circuit. 5. The heat recovery system according to claim 3, wherein a bypass path bypassing the second heat exchanger is provided in the circulation heating circuit, and the bypass path is disposed in the heat storage tank. And a switching means for switching the flow path of the second heat medium of the circulation heating circuit to the second heat exchanger side or the bypass path side. Heat recovery system. 6. The heat recovery system according to claim 5, further comprising: a first temperature detecting unit provided in the heat storage tank; and a second temperature detecting unit provided in the circulation heating circuit.
The said recovery means switches the said flow path based on the detection output of both said detection means, The heat recovery system characterized by the above-mentioned. 7. A cogeneration system comprising the heat recovery system according to claim 1, wherein the heat generated by the heat source is heat generated by an engine. 8. A cogeneration system comprising: the heat recovery system according to claim 1; and a starting power supply for starting the heat source at the time of a power failure. 9. The heat recovery system according to claim 3, wherein the second heat medium is hot and cold water in a bathtub. 10. The cogeneration system according to claim 7, wherein the second heat exchanger uses the heat medium as a first heat medium and exchanges heat with the first heat medium. The heat recovery system communicates with a circulation heating circuit in which the heat medium circulates, wherein the second heat medium is hot water in a bathtub.