JP3963847B2 - Waste heat utilization system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waste heat utilization system that recovers waste heat generated in kitchens, in particular, commercial kitchens such as hotels and restaurants.
[0002]
[Prior art]
A conventional intake / exhaust device and waste heat treatment in a kitchen will be described with reference to the drawings.
FIG. 4 is a schematic configuration diagram of a conventional intake / exhaust device in a kitchen. A cooking heater 100 such as a gas range or an electric cooking heater is installed in the kitchen. A heated part 200 is placed on the heating part 101 of the cooking heating apparatus 100 and heated. This heated part 200 is a pan containing ingredients such as boiled food.
[0003]
Next, the intake / exhaust device 300 that processes waste heat from the cooking heating device 100 and the heated portion 200 will be described. The intake / exhaust device 300 includes a hood 301, an exhaust fan motor 302, an exhaust duct 303, and an intake duct 304.
[0004]
The hood 301 is provided so as to be located above the cooking heating device 100 and the heated portion 200. The hood 301 communicates with the outside by an exhaust duct 303 that penetrates the outer wall 400 of the kitchen, and forms an exhaust port 401.
The kitchen communicates with the outside through an air inlet 402 and an air intake duct 304 separately provided on the outer wall 400.
The exhaust fan motor 302 is provided inside the hood 301 and is operated and stopped by an operation switch (not shown).
[0005]
When such an intake / exhaust device 300 is operated, an air flow including waste heat generated from the cooking heating device 100 and the heated portion 200 is collected in the hood 301 located above by the rotation of the exhaust fan motor 302. Then, the air is exhausted from the exhaust duct 303 and the exhaust port 401 to the outside. As a result, the air pressure in the kitchen is lowered, so that clean air flows from the outside through the air inlet 402 and the air intake duct 304.
Such a conventional intake / exhaust device and waste heat treatment are as described above.
[0006]
Furthermore, for example, Japanese Patent Application Laid-Open No. 5-66026 discloses a technology based on such an intake / exhaust device to maintain a comfortable air-conditioning environment for a cook, or a technology that realizes energy saving for kitchen air-conditioning equipment. Or the invention described in Japanese Patent Laid-Open No. 9-243067 is disclosed.
[0007]
[Patent Document 1]
JP-A-5-66026 (paragraph numbers 0012 to 0022, FIGS. 1 and 2)
[Patent Document 2]
JP-A-9-243067 (paragraph numbers 0008 to 0020, FIGS. 1 and 2)
[0008]
[Problems to be solved by the invention]
According to the prior art, the warm air generated from the cooking heating unit and the pan filled with heated water or oil is not just waste heat, but rather gives the cook an unpleasant feeling, It was shunned as an impediment to energy loss, and exhausted without actively using it as an energy source.
However, from the viewpoint of efficient use of energy in recent years, it is rather necessary to actively use waste heat as an energy source, and such use of waste heat is required.
[0009]
Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to recover heat from the warm air generated from the heating unit that is in a high temperature state during cooking and the pan containing heated water and oil. It is to provide a waste heat utilization system that contributes to energy saving by using it as heat storage energy.
[0010]
Another purpose is to further save energy by using in combination with a heat storage hot water supply system (using cheap night electricity, boiling hot water at night, storing hot water, and using hot water during the day).
Another purpose is to propose a system that is integrated with an electric cooking heater that is easy to control and operate, especially in commercial kitchens for hotels, restaurants, etc., which have a particularly high energy-saving effect, and thus to promote demand for electric cooking heaters. There is.
[0011]
[Means for Solving the Problems]
In order to solve the above problems, the waste heat utilization system of the present invention is as described in claim 1.
Located above the heating device for cooking, which is an electric cooking heater, and a hood that converges and takes in the warm air generated by heating, and is disposed in the hood, recovers heat from the warm air generated by the heating of the cooking heating device, and circulates An intake / exhaust device having a heat recovery device that heats and circulates and flows out the heat recovery medium that flows in, and an exhaust fan that exhausts an air flow remaining after heat recovery from the warm air from within the hood;
Heat exchange is performed between the heated heat recovery medium that circulates and flows from the intake / exhaust device and the carbon dioxide refrigerant that circulates and flows to each of the heated carbon dioxide refrigerant and the heat recovery medium that has been removed of heat. A first heat exchanger that circulates and flows out, a compressor that pressurizes and circulates the heated carbon dioxide refrigerant that circulates and flows from the first heat exchanger, and a heated carbon dioxide refrigerant that circulates and flows from the compressor, A second heat exchanger that performs heat exchange with the hot-water supply water that circulates in and flows out heat-removed carbon dioxide refrigerant and heated hot-water supply water, and heat removal that flows from the second heat exchanger An expansion valve that decompresses the discharged carbon dioxide refrigerant and flows out to the first heat exchanger, and connects the first heat exchanger, the compressor, the second heat exchanger, and the expansion valve in series with a refrigerant pipe. Refrigerant circulation circuit And a heat pump unit to be formed,
A heat utilization unit that has a pump that circulates hot-water supply water that circulates and flows from the heat pump unit, and a storage tank that stores the hot-water supply water that circulates and flows, and uses heat stored by using the heated hot-water supply When,
A first measurement processing unit for measuring the temperature of the carbon dioxide refrigerant;
A second measurement processing unit for measuring the temperature of hot water supply water;
A controller that inputs temperature measurement values of the first measurement processing unit and the second measurement processing unit and performs operation control of the compressor to adjust the temperature of hot water supply water ;
With
Heat is recovered from the warm air generated by the heating of the cooking heating device, the temperature of the carbon dioxide refrigerant is raised by the heat recovery medium supplied with heat, and the carbon dioxide refrigerant flowing through the refrigerant circulation circuit is exposed to the outside air to generate heat. In addition to suppressing loss, the temperature difference between the hot water supply water and the carbon dioxide refrigerant is kept constant, and the temperature of the hot water supply water is rapidly increased to reuse the warm air.
[0012]
Moreover, the waste heat utilization system of the present invention, as described in claim 2,
In the waste heat utilization system according to claim 1,
The cooking heating device, which is the electric cooking heater,
A cooking heating unit comprising an electromagnetic induction coil;
A temperature control unit for controlling the temperature of the cooking heating unit;
An operation unit for operating the temperature control unit;
A temperature display for displaying the temperature;
A safety device with a function to prevent overheating, airing or forgetting to switch off;
It is characterized by providing.
[0013]
Moreover, the waste heat utilization system of the present invention, as described in claim 3,
In the waste heat utilization system according to claim 2 ,
And it features that you run in conjunction with the electric cooking heater.
[0014]
Moreover, the waste heat utilization system of the present invention, as described in claim 4,
In the waste heat utilization system according to claim 2 or claim 3,
It operates independently of the electric cooking heater and operates for a predetermined period even after the electric cooking heater is stopped .
[0015]
Moreover, the waste heat utilization system of the present invention, as described in claim 5,
In the waste heat utilization system according to claim 4 ,
It is characterized by using a commercial kitchen residual heat source and nighttime power of a hotel or restaurant after the end of business and operating for a predetermined period to store hot water supply water .
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a system diagram of a waste heat utilization system of the present invention, FIG. 2 is a system diagram of a specific embodiment of the waste heat utilization system of the present invention, and FIG. 3 is a partial configuration diagram of another waste heat utilization system.
As shown in FIG. 1, the waste heat utilization system includes an intake / exhaust device 10, a heat exchange unit 20, and a heat utilization unit 30, and performs heat recovery from warm air generated by heating of the cooking heating device 50 as heat energy. It is what you use.
[0022]
The cooking heating device 50 is, for example, an electric cooking heater. In recent years, electric cooking heaters with excellent energy saving effect and heating efficiency have come to the market, and are becoming more advantageous in terms of safety and hygiene than other energy sources, and demand is increasing year by year. The cooking heating device 50 that is such an electric cooking heater includes a heating unit 51 that generates a high-frequency magnetic field by flowing a high-frequency current through an electromagnetic induction coil, and is a heated portion 60 (for example, a pan) that is electromagnetically coupled as a load. Cooking is performed by heating such that the heated portion 60 itself generates heat due to Joule heat generated by flowing an eddy current.
[0023]
Specifically, the heating unit 51 includes a cooking heating unit including an electromagnetic induction coil, a temperature control unit that controls the temperature of the cooking heating unit, an operation unit that operates the temperature control unit, a temperature display unit that displays temperature, and an overheat. , A safety device having a function of preventing airing or forgetting to switch off, and other accessory parts.
The cooking heating device 50 is not limited to an electric cooking heater, and may be a cooking heating device using a heating power such as a stove.
[0024]
Next, the intake / exhaust device 10 will be described.
The cooking heating device 50 is heated to a high temperature during cooking, and warm air (steam) is generated from the ingredients (eg, boiled water or oil) in the heated portion (pan) 60. Such warm air is taken in, and heat is recovered from the warm air.
[0025]
A heat recovery medium circulates between the intake / exhaust device 10 and the heat exchange unit 20. For example, it circulates in the direction of arrow a shown in FIG. The intake / exhaust device 10 heats the heat recovery medium that circulates and flows in from the heat exchange unit 20, and circulates the heat to the heat exchange unit 20. At the same time, the air flow remaining after heat recovery from the warm air is exhausted.
[0026]
Next, the heat exchange unit 20 will be described.
The heat exchange unit 20 is configured to circulate a heat exchange medium for performing heat exchange. For example, it circulates in the direction of arrow b shown in FIG. The heated heat recovery medium also circulates and flows from the intake / exhaust device 10 into the heat exchange unit 20. Then, heat exchange is performed between the heat recovery medium and the heat exchange medium. The heat exchange medium is heated and circulates and flows out in the heat exchanging unit 20, and the heat recovery medium is deheated and sucked and exhausted. It circulates out to the apparatus 10.
[0027]
Further, the heat storage medium 30 circulates into the heat exchanging unit 20 from the heat utilization unit 30. For example, it circulates in the direction of arrow c shown in FIG. Heat exchange is performed between the heat exchange medium and the heat storage medium, the heat exchange medium is removed from heat and circulates and flows out in the heat exchange unit 20, and the heat storage medium is heated and circulated to the heat utilization unit 30. leak.
In the heat exchanging unit 20, the heat exchanging medium circulates in this way, and the intake / exhaust device 10 and the heat utilization unit 30 mediate heat.
[0028]
Next, the heat utilization unit 30 will be described.
The heat utilization unit 30 stores the heat storage medium circulated from the heat exchange unit 20 directly, or further stores the heat by exchanging heat with another medium. Then, necessary heat is used as appropriate.
According to such a waste heat utilization system, it is possible to reuse the warm air generated by the heating of the cooking heating device 50.
[0029]
Next, a more specific embodiment of the waste heat utilization system of the present invention will be described with reference to FIG.
In the present embodiment, the intake / exhaust device 10 in FIG. 1 is a device that efficiently recovers warm air (steam) with a hood. Moreover, the heat exchange part 20 of FIG. 1 is a heat pump unit. Moreover, the heat utilization unit 30 of FIG. 1 is a hot water supply system. In addition, since it is the same structure about the heating apparatus 50 for cooking, the overlapping description is abbreviate | omitted.
[0030]
Hereinafter, a description will be given with reference to FIG.
The intake / exhaust device 10 includes a hood 11, a heat recovery device 12, a duct 13, an exhaust fan 14, and a pipe 15.
The hood 11 is located above the cooking heating device 50 and has a function of converging and taking in warm air generated by heating. This warm air is generated from the heating unit 51 and the heated portion 60 (for example, a pan containing boiled food) placed on the heating unit 51.
[0031]
Inside the hood 11, a heat recovery device 12 is installed. The heat recovery device 12 recovers heat from the warm air generated by the heating of the cooking heating device 50, and heats the dry air that is a heat recovery medium circulating from the first heat exchanger 22 of the heat exchange unit 20. Heat from the recovery is heated and circulated out to the first heat exchanger 22 as high-temperature dry air.
[0032]
The heat recovery device 12 includes a space (hot air side space for convenience) through which warm air (steam) generated in the heating unit 51 and the heated unit 60 flows and dry air circulating in the pipe 15 in a substantially rectangular parallelepiped case. It is divided by a partition wall 12a into a passing space (for convenience, a warm air side space). The heat recovery device 12 includes a plurality of metal heat pipes 12b penetrating the partition wall 12a and extending between the hot air side space and the hot air side space, such as copper, aluminum or an alloy, and having good mechanical conductivity and mechanical strength. It is arrange | positioned in the coaxial parallel direction.
[0033]
Each heat pipe 12b has a double pipe structure including an inner pipe provided with innumerable fine holes therein, and repeatedly evaporates / solidifies on one hot air side and the other hot air side in the same heat pipe 12b. Working fluid is enclosed. Then, heat is conducted from the hot air side space of the heat recovery device 12 (that is, the space where heat is recovered from the warm air (steam)) to the hot air side space via the heat pipe 12b, and heat is generated in the dry air flowing into the hot air side space. Supply and circulate out as high temperature dry air.
[0034]
This high-temperature dry air circulates and flows into the first heat exchanger 22, dissipates heat to the refrigerant, and then returns from the hot air side space through which warm air (steam) flows when returning to the hot air side space when the temperature becomes low. It is refluxed repeatedly such that it becomes high-temperature dry air and circulates and flows into the first heat exchanger 22.
In this way, heat is transferred from the intake / exhaust device 10 integrally formed with the electric cooking heater to the heat exchanging unit (heat pump unit) 20 so that the stored heat energy of the warm air (steam) recovered by the heat recovery device 12 is easily mediated. ing.
[0035]
The hood 11 communicates with the outside through the continuous duct 13, and warm air (steam) generated from the heating unit 51 and the heated unit 60 is attached to the tip and converged and taken in by the exhaust fan 14 operated by a motor, The air flow after exhaust heat is exhausted by the heat recovery device 12.
In addition, the suction port of the hood 11 is detachably provided with a filter (not shown) that also functions as oil mist, deodorization, dust prevention, and the like from the heated portion 60 to protect the heat recovery device 12. .
[0036]
Next, the heat exchange unit 20 that is a heat pump unit will be described. The heat exchanging unit 20 includes a refrigerant pipe 21, a first heat exchanger 22, a compressor 23, a second heat exchanger 24, and an expansion valve 25. And the heat pump unit which consists of a refrigerant circulation circuit which connected the 1st heat exchanger 22, the compressor 23, the 2nd heat exchanger 24, and the expansion valve 25 in series with the refrigerant pipe 21 is formed.
[0037]
The first heat exchanger 22 performs heat exchange between heated high-temperature dry air (heat recovery medium) that circulates and flows from the intake / exhaust device 10 and refrigerant (heat exchange medium) that circulates and flows, The discharged refrigerant and the high-temperature dry air removed from heat are circulated and discharged.
The compressor 23 pressurizes and heats the heated refrigerant that circulates and flows from the first heat exchanger 22 to circulate and flow out.
[0038]
The second heat exchanger 24 performs heat exchange between the heated refrigerant that circulates and flows from the compressor 23 and hot-water supply water (heat storage medium) that circulates and flows, and heats the removed heat and the hot-water supply water. The hot water obtained in this way is discharged.
The expansion valve 25 decompresses the heat-removed refrigerant flowing from the second heat exchanger 24 and flows out to the first heat exchanger 22. The expansion valve 25 is configured to adjust the valve opening, and the pressure during decompression of the refrigerant can be adjusted according to the valve opening.
[0039]
Next, heat exchange by the heat pump unit will be described.
The refrigerant condensed in the second heat exchanger 24 is guided to the expansion valve 23 and decompressed at a low temperature, and is guided to the first heat exchanger 22. The low-temperature decompressed refrigerant absorbs the heat of the high-temperature dry air in the first heat exchanger 22 and evaporates to be gasified. The gasified refrigerant is sucked into the compressor 23, further brought to a high temperature and high pressure, and led to the second heat exchanger 24.
[0040]
The second heat exchanger 24 has a configuration in which heat is exchanged by making the pipe 34 through which hot water supply water and the refrigerant pipe 21 through which the refrigerant recirculate face each other, and radiates heat to the hot water supply water. In the second heat exchanger 24, the refrigerant that has been heated to high temperature and pressure by the compressor 23 is condensed by applying heat to the hot water supply water (heat storage medium) that flows in through the piping. The condensed refrigerant is guided to the expansion valve 23, and thereafter repeats circulation in the same cycle.
[0041]
Next, the heat utilization unit 30 will be described. Specifically, the heat utilization unit 30 is a hot water supply unit that uses hot water supply water as a heat storage medium, circulates the hot water circulated from the heat exchanging unit 20, a storage tank 32 that stores the circulated hot water, The valve 33 is connected via a pipe 34 and uses the heat stored by using heated hot water.
The hot water supply water that has flowed in through the valve 33 is guided to the second heat exchanger 24 and becomes hot water. Hot water is stored in a storage tank 32 sucked by a pump 31 so that the stored hot water can be appropriately supplied to a kitchen, a bathroom, or the like.
[0042]
The heat pump unit using the refrigerant used in such a waste heat utilization system has a substantially constant temperature difference between the flowing hot water supply water temperature and the delivered refrigerant temperature in the second heat exchanger 24 that performs water heat exchange. It is controlled to become.
Therefore, a first measurement processing unit 41 that measures the temperature of the refrigerant and a second measurement processing unit 42 that measures the temperature of the hot water supply water are installed, and the first measurement processing unit 41 and the second measurement processing unit 42 A controller 43 is provided that performs operation processing based on the temperature measurement value and controls the operation of the compressor 23. Thereby, the temperature of hot water can be adjusted.
[0043]
For example, the first measurement processing unit 41 detects an excessive increase in high pressure as the temperature, and sends the signal to the controller 43. The controller 43 compares the value with the set value of the condensation temperature corresponding to the high pressure upper limit value. When it is confirmed that the value exceeds the upper limit value, the controller 43 performs control so as to reduce the rotational speed of the compressor 23 and suppress further increase in the high pressure.
[0044]
In addition, when the second measurement processing unit 42 detects the temperature of hot water and the temperature of hot water derived from the second heat exchanger 24 is lower than the set value, the controller 43 increases the rotation speed of the compressor 23. Control to increase the heating capacity and increase the hot water temperature. When the temperature of the hot water led out from the second heat exchanger 24 is higher than the set value, the controller 43 performs control so as to lower the heating speed by lowering the rotation speed of the compressor 23 to lower the hot water temperature. .
Although the refrigerant is not particularly limited, it is desirable to use a defluorocarbon substitute from the viewpoint of environmental conservation, and carbon dioxide (CO ₂ ) having a low critical temperature and a high saturation pressure is suitable for the heat pump unit. ing.
[0045]
According to such a waste heat utilization system, a heat pump unit that repeats heat radiation from the refrigerant to the hot water supply water is employed as the heat exchange unit 20. Heat recovery from the above-described warm air (steam) is performed by the heat recovery device 12 and the temperature of the refrigerant is increased by the high-temperature dry air that is supplied with heat, so that heat loss caused by exposure of the refrigerant flowing through the refrigerant pipe 21 to the outside air is suppressed. To do.
In addition, since the temperature of the high-temperature dry air rises due to warm air, the temperature of the hot water supply water is quickly raised while keeping the temperature difference between the hot water supply water and the refrigerant constant, thereby providing an efficient heat pump unit.
[0046]
In the waste heat utilization system of the present embodiment, the convenience can be further improved by operating in conjunction with the operation of a switch unit (not shown) of the cooking heating device 50.
Furthermore, since commercial rooms such as hotels and restaurants have a high room temperature due to residual heat sources even after the end of business, the intake / exhaust device can be operated independently using nighttime power to store hot water. Specifically, a timer device (not shown) is provided, and the waste heat utilization system is operated for a predetermined time by the timer device even after the heating device 50 for cooking is stopped by operating the switch unit. This is realized by providing a control device that automatically stops the system. This configuration can contribute to energy saving.
[0047]
As described above, the present invention integrally forms the heating part for cooking, the heated part, the hood, the heat exchanging part, and the tank in combination with the electric cooking heater that is easily controlled and operated electrically. Although it is set as the waste heat utilization method which applied the heat | energy storage energy of the warm air (steam) generated from an intake / exhaust device and boiled food etc. to a hot-water supply system, of course, it is not specified to these.
[0048]
In accordance with the spirit of the present invention, other exhaust heat use such as an intake / exhaust device integrally formed with the heating unit for gas cooking, individual air conditioning in a limited area that cannot be covered by the overall air conditioning, use with limited functions in general households, etc. It goes without saying that it can be applied to forms.
Next, such an embodiment will be described with reference to FIG.
[0049]
As shown in FIG. 3, a fan 71 that rotates by a motor 71 a and takes in warm air (steam), a heat exchange portion 72 that includes a single pipe or a metal pipe that branches into a plurality of parts and is integrally formed with a fin, and branches. A nozzle 73 that bundles pipes and guides cold / hot water, a pump 74 that recirculates cold / hot water into the nozzle 73, a power supply battery 75, and a control unit 76 such as a switch unit are provided. Are integrally coated.
[0050]
On the outer periphery of the pipe of the heat exchanging portion 72, disk-shaped fins are continuously formed in a direction perpendicular to the central axis direction. In addition, it is good also as a structure which winds a pipe helically without providing a disk-shaped fin and increases the pipe surface area which contacts warm air (steam). And since it is a simple structure using direct heat storage energy, you may make it easy to handle.
[0051]
Also, it is easy to face not only warm air (steam) but also other heat sources. By connecting pipes to both nozzles, for example, a storage tank with a hose, the hot and cold water circulating in the pipe is the case. Heat is absorbed when passing through the pipe and crossing with the pipe, and it is possible to obtain hot water in a relatively small amount, and it is possible to use waste heat in detail, such as single people or elderly couple households, the structure on the intake / exhaust device side or hot water supply system side You may use properly corresponding to.
[0052]
【The invention's effect】
According to the present invention, use of waste heat that contributes to energy saving by recovering heat from a heating part that becomes a high temperature state during cooking and warm air generated from a pot containing heated water or oil and using it as heat storage energy A system can be provided.
Moreover, the waste heat utilization system which aims at further energy saving by using together with a thermal storage hot-water supply system etc. can be provided.
In addition, we have proposed a system that can be integrated with an electric cooking heater that can be easily controlled and operated, especially in commercial kitchens for hotels, restaurants, etc., which have a particularly high energy-saving effect, and as a result, a waste heat utilization system that contributes to promoting demand for electric cooking heaters. Can be provided.
[Brief description of the drawings]
FIG. 1 is a system diagram of a waste heat utilization system of the present invention.
FIG. 2 is a system diagram of a specific embodiment of the waste heat utilization system of the present invention.
FIG. 3 is a partial configuration diagram of another waste heat utilization system.
FIG. 4 is a schematic configuration diagram of a conventional intake / exhaust device in a kitchen.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Intake / exhaust apparatus 11 Hood 12 Heat recovery apparatus 12a Partition wall 12b Heat pipe 13 Duct 14 Exhaust fan 15 Pipe 20 Heat exchange part 21 Refrigerant pipe 22 First heat exchanger 23 Compressor 24 Second heat exchanger 25 Expansion valve 30 Heat utilization unit 31 Pump 32 Storage Tank 33 Valve 34 Pipe 41 First Measurement Processing Unit 42 Second Measurement Processing Unit 43 Controller 50 Cooking Heating Device 51 Heating Unit 60 Heated Unit 71 Fan 71a Motor 72 Heat Exchange Unit 73 Nozzle 74 Pump 75 Power Supply Battery 76 Control unit 100 Cooking heating device 101 Cooking heating unit 200 Heated unit 300 Intake / exhaust device 301 Hood 302 Exhaust fan motor 303 Exhaust duct 304 Intake duct 400 Outer wall 401 Exhaust port 402 Inlet port

Claims (5)

Located above the heating device for cooking, which is an electric cooking heater, and a hood that converges and takes in the warm air generated by heating, and is disposed in the hood, recovers heat from the warm air generated by the heating of the cooking heating device, and circulates An intake / exhaust device having a heat recovery device that heats and circulates and flows out the heat recovery medium that flows in, and an exhaust fan that exhausts an air flow remaining after heat recovery from the warm air from within the hood;
Heat exchange is performed between the heated heat recovery medium that circulates and flows from the intake / exhaust device and the carbon dioxide refrigerant that circulates and flows to each of the heated carbon dioxide refrigerant and the heat recovery medium that has been removed of heat. A first heat exchanger that circulates and flows out, a compressor that pressurizes and circulates the heated carbon dioxide refrigerant that circulates and flows from the first heat exchanger, and a heated carbon dioxide refrigerant that circulates and flows from the compressor, A second heat exchanger that performs heat exchange with the hot-water supply water that circulates in and flows out heat-removed carbon dioxide refrigerant and heated hot-water supply water, and heat removal that flows from the second heat exchanger An expansion valve that decompresses the discharged carbon dioxide refrigerant and flows out to the first heat exchanger, and connects the first heat exchanger, the compressor, the second heat exchanger, and the expansion valve in series with a refrigerant pipe. Refrigerant circulation circuit And a heat pump unit to be formed,
A heat utilization unit that has a pump that circulates hot-water supply water that circulates and flows from the heat pump unit, and a storage tank that stores the hot-water supply water that circulates and flows, and uses heat stored by using the heated hot-water supply When,
A first measurement processing unit for measuring the temperature of the carbon dioxide refrigerant;
A second measurement processing unit for measuring the temperature of hot water supply water;
A controller that inputs temperature measurement values of the first measurement processing unit and the second measurement processing unit and performs operation control of the compressor to adjust the temperature of hot water supply water ;
With
Heat is recovered from the warm air generated by the heating of the cooking heating device, the temperature of the carbon dioxide refrigerant is raised by the heat recovery medium supplied with heat, and the carbon dioxide refrigerant flowing through the refrigerant circulation circuit is exposed to the outside air to generate heat. A waste heat utilization system that suppresses losses and rapidly raises the temperature of hot water supply water while keeping the temperature difference between the hot water supply water and the carbon dioxide refrigerant constant, thereby reusing warm air. In the waste heat utilization system according to claim 1,
The cooking heating device, which is the electric cooking heater,
A cooking heating unit comprising an electromagnetic induction coil;
A temperature control unit for controlling the temperature of the cooking heating unit;
An operation unit for operating the temperature control unit;
A temperature display for displaying the temperature;
A safety device with a function to prevent overheating, airing or forgetting to switch off;
A waste heat utilization system characterized by comprising: In the waste heat utilization system according to claim 2 ,
Waste heat utilization system which is characterized that you run in conjunction with the electric cooking heater. In the waste heat utilization system according to claim 2 or claim 3,
A waste heat utilization system that operates independently of an electric cooking heater and operates for a predetermined period even after the electric cooking heater is stopped . In the waste heat utilization system according to claim 4 ,
A waste heat utilization system that stores hot water for hot water using a commercial kitchen residual heat source and nighttime power of a hotel or restaurant after the end of business, operating for a predetermined period of time .

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