JP2010276254A - Unit kitchen built-in type water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater installed within a unit kitchen and capable of obtaining high energy efficiency by recovering exhaust heat of a cooking container to supply hot water and of improving comfortability by reducing equipment exhaust heat. <P>SOLUTION: The water heater includes: a heat pump 9 constituted of a compressor 11, a radiator 13, a decompression means 10 and an evaporator 12; a hot water storage tank 16 for storing hot water heated by the radiator 13; and an air blowing means 14 for sending air within the unit kitchen 1 to the evaporator 12. The heat pump 9 and the hot water storage tank 16 are arranged in one section of a storage space of the unit kitchen 1, and hot water stored in the hot water storage tank 16 is used for equipment mounted to the unit kitchen 1. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a system kitchen built-in hot water supply apparatus.

  In recent years, there has been an increase in the number of system kitchens equipped with heating cookers such as microwave ovens, induction heating cookers, gas stoves, and dishwashers, and in particular, the face-to-face type that allows cooking while talking with family members has come to be preferred. The kitchen has become a place of social gathering, and comfort is also important.

  The system kitchen is usually equipped with a sink, and hot water is drawn from a water heater installed outside the system kitchen so that it can be used in the sink. Hot water may also be used in dishwashers built in the system kitchen.

  There are hot water storage type and instantaneous type, and there are those using a heat pump in addition to heating by gas, oil and electric heater. In household heat pump water heaters, Eco-cute, which stores hot water in a large hot water storage tank of several hundred liters, is becoming widespread.

  The heat pump enables heating and cooling by circulating the refrigerant in the refrigerant circuit formed by the compressor, radiator, decompression means, and evaporator, and moving the heat from the heat absorption part to the heat radiation part. In general, the greater the temperature difference between heat dissipation and heat absorption, the lower the energy efficiency of the heat pump. The reachable temperature range is determined by the physical properties of the refrigerant.

  In Eco Cute, the hot water tank is filled with water, and the generated hot water is poured from the upper part of the hot water tank so that the hot water is gradually stored downward from the upper part. Warm water and cold water are mixed gradually due to diffusion, but because the capacity itself is large, the whole is not almost uniform temperature, and even if the whole hot water tank is not filled with hot water, hot water can be taken out from the top Thus, it is possible to always supply hot water having a sufficient temperature.

  However, in a hot water storage type hot water heater, it is usually difficult to install in the vicinity of the kitchen because the hot water tank is large, and the pipe is drawn from the hot water tank to the kitchen, but the temperature of the hot water remaining in the pipe decreases. . Therefore, if you try to use hot water in the kitchen, the amount of water that is left in the pipe will be cooled, and you will have to keep draining until hot water of sufficient temperature comes out. It will be.

  As a method for solving this, a water heater that heats water with a heating unit and a heat storage material in the vicinity of the faucet (see, for example, Patent Document 1), or a hot water storage tank containing a heat source different from the main heat source is installed near the faucet, There has been proposed a system (for example, see Patent Document 2) in which hot water and water in this hot water tank are mixed and supplied from a faucet until there is no cold water in the pipe.

  On the other hand, a system that uses the exhaust heat of the kitchen has been proposed as a means of improving the comfort of the kitchen and obtaining energy use efficiency.

For example, one that supplies hot water using waste heat from a refrigerator (for example, see Patent Document 3), one that leads a water pipe to the top of the range hood, collects exhaust heat, and uses it as hot water (for example, see Patent Document 4) A system for recovering hot water for washing of a dishwasher and drying and generating hot water and reducing the discomfort of exhaust (for example, see Patent Document 5), hot water supply using a heat pump and spot cooling of the kitchen at the same time A system (for example, see Patent Document 6) that performs the above has been proposed.

  Moreover, what collect | recovers and accumulate | stores the exhaust heat from the various apparatuses incorporated in the system kitchen is proposed (for example, refer patent document 7).

Japanese Unexamined Patent Publication No. 63-217153 JP-A-62-116839 JP 2000-065444 A JP 2001-041554 A JP 2006-317088 A JP 61-154512 A Japanese Patent Laid-Open No. 9-094124

  However, in Patent Documents 1 and 2, a heat source is separately provided in addition to the main heat source, and an improvement in convenience is realized, but neither is considered in terms of energy efficiency.

  As a system for obtaining high energy efficiency, in Patent Document 3 above, hot water is generated using the exhaust heat of the refrigerator, but there is a large temperature difference between hot water supply and refrigeration, and it is difficult to realize with one heat pump. Even if it can be realized, high energy efficiency cannot be obtained.

  Moreover, since the heat load of the refrigerator is small in winter when a larger amount of hot water is required, it is difficult to ensure the amount of hot water supplied with the exhaust heat of the refrigerator, which is not effective from the viewpoint of energy efficiency.

  Moreover, in the said patent document 4, since water piping is guide | induced to a range hood, exhaust heat is collect | recovered and utilized as warm water, since the water piping is routed, there exists a subject that the heat loss in piping is unavoidable.

  In Patent Document 5, heat is recovered from the high-temperature and high-humidity exhaust air of the dishwasher / dryer. However, since the amount of hot water used by the dishwasher / dryer is small, an improvement in energy efficiency cannot be realized.

  Moreover, in the said patent document 6, since the cooling exhaust heat is utilized for hot water supply, since the cooling is not used in winter, there exists a subject that the advantage cannot be utilized.

  Moreover, in the system of the above-mentioned patent document 7, although the equipment waste heat in the system kitchen is stored by the heat storage means, the heat recovery means and the usage of the heat are not described, and the temperature of the heat storage can be lowered. It is difficult to use effectively, and even if the temperature is sufficiently high, heat is dissipated in a state where heat is not used, or if it is used at a distance, there is a loss due to heat dissipation during heat transfer. There is a fear that it becomes large, and it cannot be said that a high effect is necessarily obtained.

  The present invention solves the above-described conventional problems, and is installed in a system kitchen, recovers cooking appliance exhaust heat and supplies hot water, thereby obtaining high energy efficiency and reducing equipment exhaust heat. It aims at providing the hot-water supply apparatus which can aim at the improvement of property.

  In order to solve the above problems, a system kitchen built-in hot water supply apparatus of the present invention includes a heat pump composed of a compressor, a radiator, a decompression means, and an evaporator, and a hot water storage tank for storing hot water heated by the radiator. And a blowing means for blowing the air in the system kitchen to the evaporator, and the heat pump and the hot water storage tank are disposed in a section of a storage space of the system kitchen, and hot water stored in the hot water storage tank Is used for the equipment equipped in the system kitchen, and it becomes possible to recover the exhaust heat from the equipment built in the system kitchen and generate hot water with high energy efficiency. The convenience of not throwing away water is obtained, and the discomfort in the vicinity of the system kitchen due to exhaust heat can be reduced. By using in instrumented function production kitchen, in which higher energy efficiency enables recycling of heat is obtained that utilized again hot water to the heat.

  According to the present invention, there is provided a hot water supply apparatus which is installed in a system kitchen, obtains high energy efficiency by collecting and supplying hot water from cooking appliance exhaust heat, and can improve comfort by reducing equipment exhaust heat. it can.

Schematic of the system kitchen of Embodiment 1 of the present invention Schematic of the hot water supply apparatus according to Embodiment 2 of the present invention. Schematic of the system kitchen of Embodiment 3 of the present invention

  A first invention is a heat pump composed of a compressor, a radiator, a decompression means, and an evaporator, a hot water storage tank for storing hot water heated by the radiator, and air in the system kitchen is blown to the evaporator. The heat pump and the hot water storage tank are disposed in a section of the storage space of the system kitchen, and the hot water stored in the hot water storage tank is used for equipment equipped in the system kitchen. It is possible to collect the waste heat from the equipment built in the system kitchen and generate hot water with high energy efficiency, and it is possible to obtain the convenience of not having to throw away water , The discomfort in the vicinity of the system kitchen due to exhaust heat can be reduced, and the generated hot water can be used again with the functions equipped in the system kitchen to reheat the heat. Higher energy efficiency enables thermal recycling of utilizing the hot water in which is obtained.

  The second invention is characterized in that the evaporator is disposed in the vicinity of the end of the system kitchen casing, and the exhaust heat from the device built in the system kitchen can be effectively guided to the evaporator. The exhaust heat recovery efficiency can be increased.

  3rd invention is equipped with the exhaust temperature detection means which detects the temperature of the air after passing an evaporator, and the room temperature detection means which detects the temperature of indoor air, The temperature of the air after passing an evaporator and indoor air The air flow rate of the air blowing means is controlled so that the air temperature is substantially the same. If the exhaust gas temperature is made equal to room temperature, the surrounding environment will not be uncomfortable. Moreover, since the temperature difference between the heat absorption and heat dissipation of the heat pump is minimized, hot water can be generated with high energy efficiency.

The fourth invention is characterized by having a plurality of hot water tanks, which can suppress the entire hot water tank from reaching a uniform temperature due to diffusion, and supply hot water even when the hot water is not full. it can. In addition, the temperature of the water circulating in the radiator can be kept low, and the energy efficiency of the heat pump can be kept high. Furthermore, with this structure, a narrow space,
There is also an effect that it can be divided into several spaces.

  The fifth invention is characterized in that a closing means is provided at a connecting portion of a plurality of hot water tanks, and between the container in which a high temperature is detected by the temperature detecting means and the container in which a low temperature is detected when the heat pump is stopped. By closing the closing means in the flow path, it is possible to more effectively suppress the inside of the hot water tank from reaching a uniform temperature.

  The sixth invention is characterized in that a cooling evaporator for absorbing heat generated from the cooking device is provided in the vicinity of the cooking device, and hot water generation and storage space cooling can be performed simultaneously, In addition, the total energy efficiency of cooling and hot water supply is increased.

  The seventh invention is characterized in that the operation operation of the compressor is determined in accordance with the operation operation of the equipment stored in the system kitchen. The heat pump can be operated almost in conjunction with the cooker, and the exhaust heat. Recovery can also be performed effectively, and hot water can be generated with high energy efficiency.

  According to an eighth aspect of the present invention, there is provided temperature detecting means for detecting the temperature of air in the system kitchen, and the compressor is operated when the temperature of the air in the system kitchen is higher than a preset temperature. In cooking, the temperature inside the cabinet of the system kitchen always rises, so it is possible to indirectly detect that cooking is in progress and operate the heat pump. While being able to generate hot water efficiently, discomfort due to exhaust heat near the system kitchen can be reduced.

  In addition, hot water can be generated with high energy efficiency if the temperature inside the housing is sufficiently high even when the built-in equipment is stopped. Therefore, when the amount of hot water in the hot water tank is small, operation is based on the temperature detected by the temperature detection means. By doing so, hot water can be generated with high energy efficiency.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows an outline of the configuration of a hot water supply apparatus according to the first embodiment of the present invention.

  The system kitchen 1 includes an induction heating cooker 2, a microwave oven 3, and a dishwasher / dryer 4 as devices for generating heat, and a sink 5 is also provided. In addition, a heat pump 9 formed of a decompression means 10, a compressor 11, an evaporator 12, and a radiator 13, in which refrigerant is circulated in the order of the compressor 11, the radiator 13, the decompression means 10, and the evaporator 12, A blowing means 14 for blowing air is also built in the system kitchen 1.

  The water in the hot water storage tank 16 is circulated through the water circulation circuit 41 from the lower part of the hot water storage tank 16 so as to be opposed to the refrigerant in the radiator 13 by the circulation means 40 provided in the water circulation circuit 41. Heat is dissipated in the heat radiator 13 and heated to become hot water, which is stored from the upper part of the hot water tank 16. In addition, a built-in device operation detection unit 33 that detects the operation of the built-in cooking device when interlocking with the temperature detection unit 17 and the built-in cooking device is provided inside the housing.

  In the induction heating cooker 2, most of the cooking heat is released to the outside of the system kitchen 1, but considerable heat is also released into the system kitchen 1 such as heat generated from the electric circuit. Most of the exhaust heat from the microwave oven 3 and the dishwasher / dryer 4 is released into the system kitchen 1.

Therefore, when cooking is started, the air temperature inside the system kitchen 1 rises. At this time, when the air blowing means 14 and the compressor 11 are operated, the air inside the system kitchen 1 passes through the evaporator 12 and absorbs heat to the refrigerant, so that the air whose temperature has decreased is released to the outside of the system kitchen 1.

  Therefore, discomfort due to exhaust heat around the system kitchen is reduced, and hot water can be generated with high energy efficiency by using exhaust heat.

  Further, when this hot water is used in the dishwasher / dryer 4, much of the heat of the hot water is released again into the interior of the system kitchen 1, so that this heat is also used to generate hot water, thereby obtaining high energy efficiency. Can do. Also, when hot water is used in the sink 5, since there is a drain pipe inside the system kitchen 1, a part of the heat is released into the system kitchen 1, so this heat is also used for generating hot water, increasing energy efficiency. be able to.

  If the evaporator 12 is installed near the end of the system kitchen 1 as shown in FIG. 1, almost all the air inside the system kitchen 1 that normally does not have a large opening passes through the evaporator 12, so that the microwave oven 3. The heat generated from the compressor 11 as well as the exhaust heat from the dishwasher / dryer 4 can be efficiently recovered, and the energy efficiency of hot water generation can be increased.

  In this case, it is more effective if there is a gap where air can flow in near the position farthest from the end where the evaporator 12 of the system kitchen 1 is installed, and the other parts are as close as possible to sealing. It is.

  Further, the temperature detected by the exhaust temperature detecting means 30 using the exhaust temperature detecting means 31 for detecting the temperature of the air passing through the evaporator and discharged to the outside of the system kitchen 1 and the room temperature detecting means 32 for detecting the room temperature. If the air volume of the air blowing means 12 is adjusted so that the air temperature becomes substantially the same as the temperature detected by the room temperature detecting means 32, the exhaust gas temperature is lowered too much, without sacrificing the energy efficiency of the heat pump, Can be made uncomfortable by exhaust heat.

  Regarding the operation of the heat pump, in order to improve energy efficiency and reduce discomfort due to exhaust heat, it is necessary to be linked with equipment built in the system kitchen 1. As an example of the operation method, if it is determined that the internal device is operating based on a signal from the operation detection means 33 that detects whether the internal device is operating, the heat pump may be operated.

  To detect the operation of the built-in device, an ON signal of the built-in device may be used, or vibration / sound, temperature, current, and electromagnetic waves generated from the cooking device may be detected. With this operation method, the heat pump can be operated only while the built-in device is operated, and the exhaust heat recovery efficiency is high, so that the energy efficiency of hot water generation is increased and the discomfort due to cooking exhaust heat is reduced.

  Alternatively, the operation may be substantially interlocked with the built-in device by starting operation at a preset time by the time detection means. Since the heat pump does not reach the maximum energy efficiency immediately after the operation is started, if the heat pump is started before the heat is discharged from the cooking device, the exhaust heat recovery may be performed more efficiently.

  In ordinary households, the cooking time is fixed every day. If the heat pump operation start time is set before the cooker operation starts, hot water can be generated with high efficiency when the built-in equipment starts. Since heat recovery of the heat pump can be performed with high efficiency at the start of operation of the equipment, heat is not discharged to the outside of the system kitchen 1, and discomfort around the system kitchen 1 can be reduced.

  There is also a method of driving if the temperature inside the system kitchen 1 detected by the temperature detecting means 17 is equal to or higher than a preset temperature. The preset temperature may be a fixed value or may be a temperature detected by the room temperature detection means 32.

  Depending on the equipment layout inside the system kitchen and the volume of the internal space, the temperature inside the system kitchen 1 does not rise immediately after the operation of the built-in equipment, and it is energy efficient to operate the heat pump in this state. If the temperature inside the system kitchen 1 is high even after the built-in equipment is stopped, etc., it is possible to increase the energy efficiency of hot water generation. Thus, the energy efficiency of hot water generation can be further increased. The operation method may be a combination of the above.

  In addition, in the present embodiment, the case of a single water heater built in the system kitchen 1 has been shown, but it is connected to a hot water pipe from another main heat source as in Patent Documents 1 and 2, and cold water is not discarded. Even with the target configuration, high energy efficiency and the effect of reducing discomfort around the system kitchen 1 can be obtained.

(Embodiment 2)
As a second embodiment of the present invention, FIG. 2 will be described as an example. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 2 shows a case where there are three spaces. 21a-c are small-capacity hot water storage tanks, each having water temperature detection means 24a-c, and connected by hot water tank connection pipes 23a, 23b. Moreover, shut-off valves 22a and 22b are installed in the hot water tank connecting pipes 23a and 23b.

  The small-capacity hot water storage tank 21a is connected to water and is supplied with water. The water in the hot water storage tank is pumped out by the pump 40, is heated by heat exchange by the radiator 13, becomes warm water, and enters the small capacity hot water storage tank 21c. Hot water leaves the small-capacity hot water storage tank 21c, and water is supplied sequentially from the small-capacity hot water storage tank 21a by the amount of used hot water.

  If the amount of heat exhausted from a cooker or the like is sufficient, hot water for the entire capacity of the hot water tank can be generated. However, if the amount of hot water that has been generated is small, in the configuration as in Embodiment 1, the hot water tank 16 The heat pump stops in a state where the hot water portion and the cold water portion coexist, and the entire hot water storage tank 16 becomes a uniform temperature due to diffusion during the stop, which may not be used as hot water.

  If the small-capacity hot water storage tanks 21a to 21c are connected by the hot water tank connection pipes 23a and 23b that are narrow flow paths as in this embodiment, diffusion can be suppressed and temperature uniformity can be reduced. In addition, with such a configuration, there is an effect that the degree of freedom of installation is increased such that installation in a narrow space is possible, and installation in the housing is facilitated.

  Furthermore, temperature detecting means 24a-c and shut-off valves 22a, 22b are installed in the small-capacity hot water storage tanks 21a-c, respectively, and hot water is stored between the hot water-saving small-capacity hot water tank and the low-temperature small-capacity hot water tank. If the shutoff valve installed in the tank connection pipe is closed, diffusion between the small-capacity hot water storage tanks can be prevented. For example, if the temperature of the water in the small-capacity hot water storage tanks 21b, c is high and the temperature of the water in the small-capacity hot water storage tank 21a is low, by closing the shut-off valve 22a, Water temperature can be maintained at a high level.

  In the present embodiment, the small-capacity hot water tanks 21a to 21c are separated from each other. However, even if the small-capacity hot water storage tanks 21a to 21c are integrated without being separated, if a plurality of spaces are separated by narrow flow paths, diffusion is performed. The effect of reducing temperature uniformity due to is obtained.

(Embodiment 3)
As a third embodiment of the present invention, FIG. 3 will be described as an example. The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted.

  The system kitchen 1 is provided with a storage space cooling evaporator 19, heat radiating means 18, and switching valves 20a and 20b for cooling the storage space 6 for storing a cooking appliance and the like. When there is no exhaust heat from the cooker, the heat recovery is only the heat from the storage space 6, but when this recovered heat amount is sufficient, hot water is generated, and hot water with a small recovered heat amount and sufficient temperature is generated. When it is difficult to do so, the refrigerant is caused to flow toward the heat radiating means 18 by the switching valves 20a and 20b, and the water circulation to the radiator 13 is not performed. To do.

  This makes it possible to generate hot water and cool the storage space with a single heat pump, and to obtain high energy efficiency. In addition, when the amount of heat radiation is sufficiently small, heat radiation may be performed only by switching the refrigerant circuit without using a special configuration as the heat radiation means 18, or when only heat radiation from the refrigerant circuit is sufficient, A configuration without the switching valves 20a and 20b may be used.

  At this time, by setting the temperature inside the storage space 6 to 5 to 20 ° C., it is possible to store seasonings and foods that need to be stored in a cool and dark place to increase work efficiency, and to make the temperature low like a refrigerator As a result, the energy efficiency of the heat pump can be increased.

  INDUSTRIAL APPLICABILITY Since the present invention can provide a hot water supply device that can improve comfort by reducing the exhaust heat of equipment, any system having equipment that generates heat in one space and a function that uses hot water can be applied. .

DESCRIPTION OF SYMBOLS 1 System kitchen 2 Induction heating cooker 3 Microwave oven 4 Dishwasher / dryer 5 Sink 6 Storage space 9 Heat pump 10 Depressurization means 11 Compressor 12 Evaporator 13 Radiator 14 Blower means 16 Hot water storage tank

Claims (8)

A heat pump including a compressor, a radiator, a decompression unit, and an evaporator; a hot water storage tank that stores hot water heated by the radiator; and a blowing unit that blows air in the system kitchen to the evaporator. The heat pump and the hot water storage tank are arranged in a section of a storage space of a system kitchen, and the hot water stored in the hot water storage tank is used for equipment equipped in the system kitchen. Kitchen built-in water heater. The system kitchen built-in hot water supply apparatus according to claim 1, wherein the evaporator is disposed in the vicinity of an end portion of the system kitchen casing. Equipped with exhaust temperature detection means for detecting the temperature of air after passing through the evaporator and room temperature detection means for detecting the temperature of indoor air, and the temperature of the air after passing through the evaporator and the temperature of the indoor air are substantially the same. The system kitchen built-in type hot water supply device according to claim 1 or 2, wherein the air flow rate of the air blowing means is controlled so that The system kitchen built-in type hot water supply apparatus according to any one of claims 1 to 3, further comprising a plurality of hot water storage tanks. The system kitchen built-in type hot water supply apparatus according to claim 4, wherein a closing means is provided at a connecting portion of the plurality of hot water storage tanks. The system kitchen built-in hot water supply device according to any one of claims 1 to 5, wherein a cooling evaporator for absorbing heat generated from the cooking device is provided in the vicinity of the cooking device. The system kitchen built-in hot water supply device according to any one of claims 1 to 6, wherein the operation operation of the compressor is determined in accordance with the operation operation of the equipment stored in the system kitchen. The temperature detection means for detecting the temperature of the air in the system kitchen is provided, and the compressor is operated when the temperature of the air in the system kitchen is higher than a preset temperature. The system kitchen built-in type hot water supply apparatus of any one of Claims.

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