CN109564007B - Heating hot water supply device - Google Patents
Heating hot water supply device Download PDFInfo
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- CN109564007B CN109564007B CN201780046008.3A CN201780046008A CN109564007B CN 109564007 B CN109564007 B CN 109564007B CN 201780046008 A CN201780046008 A CN 201780046008A CN 109564007 B CN109564007 B CN 109564007B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 319
- 238000010438 heat treatment Methods 0.000 title claims abstract description 141
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 22
- 238000002485 combustion reaction Methods 0.000 claims description 26
- 239000013505 freshwater Substances 0.000 claims description 23
- 239000008236 heating water Substances 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract description 6
- 239000000567 combustion gas Substances 0.000 description 10
- 239000002737 fuel gas Substances 0.000 description 9
- 239000007789 gas Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/20—Control of fluid heaters characterised by control inputs
- F24H15/238—Flow rate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/305—Control of valves
- F24H15/31—Control of valves of valves having only one inlet port and one outlet port, e.g. flow rate regulating valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/335—Control of pumps, e.g. on-off control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H15/00—Control of fluid heaters
- F24H15/30—Control of fluid heaters characterised by control outputs; characterised by the components to be controlled
- F24H15/355—Control of heat-generating means in heaters
- F24H15/36—Control of heat-generating means in heaters of burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Water Supply & Treatment (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention provides a heating hot water supply device which can avoid high-temperature hot water from coming out even if hot water is supplied during heating operation without using a distribution valve or a three-way valve with a blocking function. The heating hot water supply device is provided with a distribution element at a branch portion of a first bypass passage, the distribution element being capable of adjusting a distribution ratio to enable each of a heating operation, a hot water supply operation, and a simultaneous heating hot water supply operation, wherein a second bypass passage bypassing a hot water supply heat exchanger is provided at the hot water supply passage, a flow rate detecting element is provided at a position upstream of the branch portion of the second bypass passage, a flow rate adjusting element of the hot water supply passage is provided at the branch portion or downstream of the branch portion and upstream of the hot water supply heat exchanger, and the hot water supply passage is blocked by the flow rate adjusting element during the heating operation.
Description
Technical Field
The present invention relates to a heating hot water supply device that heats a heating medium by combustion heat to supply heat, and heats fresh water by heat exchange with the heating medium to supply hot water, and more particularly, to a heating hot water supply device that can simultaneously perform a heating operation and a hot water supply operation.
Background
Conventionally, a heating hot water supply device capable of simultaneously performing a heating operation and a hot water supply operation has been widely used. As shown in patent document 1, for example, this type of heating hot water supply device includes a heat exchanger and a heating terminal, and further includes a circulation passage through which a heating medium is circulated between the heat exchanger and the heating terminal by a circulation pump, and a bypass passage branching from the circulation passage and bypassing the heating terminal.
The bypass passage is provided with a hot water supply heat exchanger, and the hot water flowing through the hot water supply heat exchanger in the hot water supply passage can be heated by a heating medium. A distribution flow rate adjusting element is provided at a branching portion between the circulation passage and the bypass passage, and the distribution ratio of the heating medium flowing to the heating terminal to the heating medium flowing to the hot water supply heat exchanger can be adjusted.
In the heating operation, fuel is combusted to heat the heating medium by the heat exchanger, and the distribution flow rate adjusting element is adjusted so that the heating medium is entirely circulated in the circulation passage. The heated heating medium dissipates heat at the heating terminal and returns to the heat exchanger.
In the hot water supply operation, the distribution flow rate adjusting element is adjusted so that a part or all of the heated heating medium is circulated to the bypass passage, and the hot water flowing in the hot water supply passage is heated by the hot water supply heat exchanger provided in the bypass passage to supply hot water. In addition, there is also a device that performs a hot water supply operation by switching the operation by a three-way valve provided in place of the distribution valve so that the heating medium is entirely circulated to the bypass passage.
The hot water supply path is provided with a hot water supply bypass path bypassing the hot water supply heat exchanger, and the hot water heated by the hot water supply heat exchanger is mixed with clean water (clean water) flowing through the hot water supply bypass path to adjust the hot water supply temperature. For example, as in patent document 1, a bypass valve is provided in the hot water supply bypass passage to adjust the flow rate of the fresh water flowing through the hot water supply bypass passage, and the fresh water is mixed with the heated hot water to adjust the hot water supply temperature. Alternatively, a mixing valve is provided at a junction of the hot water supply passage and the hot water supply bypass passage, and the mixing ratio of the heated hot water and the fresh water is adjusted to mix the heated hot water and the fresh water and adjust the hot water supply temperature.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2005-337632
Disclosure of Invention
Problems to be solved by the invention
When such a heating hot water supply device performs a heating operation, a high-temperature heating medium circulates between the heating terminal and the heat exchanger. However, the distribution valve or the three-way valve provided in the branch portion between the circulation passage and the bypass passage is not generally an expensive distribution valve or three-way valve with a blocking function, and thus the flow of the heating medium out to the bypass passage cannot be completely prevented in the heating operation. Therefore, the hot water in the hot water supply heat exchanger is heated by the high-temperature heating medium flowing out to the bypass passage in the heating operation.
In addition, even outside the hot water supply heat exchanger, the temperature of the hot water in the hot water supply passage is increased by the heat transfer of the hot water. For example, in the heating hot water supply device of patent document 1, the temperature of hot water in the hot water supply passage or the hot water supply bypass passage on the upstream side and the downstream side of the hot water supply heat exchanger increases by heat transfer. When the hot water supply is started in this state, the hot water in the hot water supply passage and the hot water supply bypass passage is heated to a high temperature after the hot water supply is started, and therefore, there is a possibility that the hot water is heated to a high temperature, which is unexpected by the user, and this is dangerous.
In order to prevent such hot water from being discharged, a method of preventing the heating medium from being discharged by using a distribution valve or a three-way valve provided in a branch portion between the circulation passage and the bypass passage as a distribution valve or a three-way valve having a blocking function is not preferable because it increases the manufacturing cost.
The invention aims to provide a heating hot water supply device which can avoid high-temperature hot water from coming out even if hot water is supplied during heating operation without using a distribution valve or a three-way valve with a blocking function.
Means for solving the problems
The heating hot water supply apparatus of the present invention includes a combustion element, a heat exchanger, a circulation passage connecting the heat exchanger and a heating terminal, a circulation pump provided in the circulation passage, a first bypass passage branching from the circulation passage to bypass the heating terminal, a hot water supply heat exchanger provided in the first bypass passage, and a hot water supply passage for supplying fresh water to the hot water supply heat exchanger and supplying hot water heated by the hot water supply heat exchanger, wherein a distribution element capable of adjusting a distribution ratio to enable each of a heating operation, a hot water supply operation, and a heating hot water supply simultaneous operation is provided in a branching portion of the first bypass passage, and a second bypass passage bypassing the hot water supply heat exchanger is provided in the hot water supply passage, a flow rate detecting element is provided upstream of a branch portion of the second bypass passage, a flow rate adjusting element for the hot water supply passage is provided downstream of the branch portion or upstream of the hot water supply heat exchanger, and the hot water supply passage is blocked by the flow rate adjusting element during a heating operation.
According to the above configuration, the hot water supply passage is blocked by the flow rate adjusting element during the heating operation, so that heat transfer of the hot water is suppressed by the flow rate adjusting element. Therefore, even if the temperature of the hot water in the hot water supply passage is increased by the heating medium flowing out of the distribution element through the hot water supply heat exchanger during the heating operation, the temperature increase of the hot water on the upstream side of the flow rate adjustment element can be suppressed. When the hot water supply is started in this state, the hot water whose temperature increase has been suppressed is supplied through the second bypass passage, so that the hot water of high temperature can be prevented from coming out.
The flow rate adjustment element may be a distribution valve provided in the branch portion.
According to the above configuration, during the heating operation, the hot water supply passage is blocked by the distribution valve, and the second bypass passage is opened. Therefore, even if the temperature of the hot water in the hot water supply passage is increased by the heating medium in the heating operation, the distribution valve can suppress heat transfer, and the temperature increase of the hot water on the upstream side of the distribution valve can be suppressed. When the hot water supply is started in this state, the hot water whose temperature increase is suppressed is supplied through the second bypass passage, and therefore, the hot water of high temperature can be prevented from coming out.
The structure may be configured as follows: the flow rate adjusting element is a flow rate adjusting valve provided on the downstream side of the branch portion and on the upstream side of the hot water supply heat exchanger, and a bypass flow rate adjusting valve is provided in the second bypass passage and is opened during a heating operation.
According to the above configuration, during the heating operation, the flow rate adjustment valve blocks the hot water supply passage, and the second bypass passage is opened. Therefore, even if the temperature of the hot water in the hot water supply passage is increased by the heating medium in the heating operation, the flow rate adjustment valve can suppress heat transfer, and the temperature increase of the hot water on the upstream side of the flow rate adjustment valve can be suppressed. When the hot water supply is started in this state, the hot water whose temperature increase is suppressed is supplied through the second bypass passage, and therefore, the hot water of high temperature can be prevented from coming out.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide a heating hot water supply device capable of preventing hot water from coming out when hot water is supplied during heating operation without using an expensive distribution valve or three-way valve with a blocking function.
Drawings
Fig. 1 is a schematic view of a heating hot water supply apparatus according to the present invention.
Fig. 2 is a graph showing the hot water supply temperature when the hot water supply passage is blocked during the heating operation.
Fig. 3 is a graph showing the hot water supply temperature when the hot water supply path is not blocked during the heating operation.
Fig. 4 is a schematic diagram of a heating hot water supply apparatus according to embodiment 2.
Description of the symbols
1. 1A: heating hot water supply device
2: combustion part (combustion element)
4: circulation path
7. 7A: control unit
8: shell body
10: heat exchanger
10 a: primary heat exchanger
10 b: secondary heat exchanger
11: circulating pump
12: first bypass path
13: first temperature sensor
14: second temperature sensor
15: first distribution valve (distribution element)
15A: first distribution valve
16: pressure relief valve
17: heating return temperature sensor
18: supplemental pathway
20: heat exchanger for hot water supply
21. 21A: hot water supply passage
22. 22A: second bypass passage
23: second distribution valve (flow adjusting element)
23A, 24: flow regulating valve
24A: bypass flow regulating valve
25. 25A: hot water supply quantity sensor
26: inlet water temperature sensor
27. 27A: hot water outlet temperature sensor
28: hot water supply temperature sensor
40: air suction passage
41: fuel gas passage
42: combustion fan
43: burner with a burner head
44: venturi mixer
45: electromagnetic valve
46: ignition device
47: combustion sensor
48: tank body
49: exhaust passage
50: exhaust gas temperature sensor
51: drainage passage
52: drain trap
Detailed Description
Hereinafter, embodiments for carrying out the present invention will be described based on examples.
Example 1
First, the overall configuration of the heating hot water supply apparatus 1 according to the present invention will be described with reference to fig. 1.
The heating hot water supply device 1 performs a heating operation by circulating a heating medium heated by heat exchange with the combustion gas generated by the combustion unit 2 between the heating hot water supply device 1 and a heating terminal, not shown, and performs a hot water supply operation by adjusting the temperature of the fresh water heated by heat exchange with the heating medium heated by heat exchange with the combustion gas to a hot water supply set temperature.
The heating hot water supply device 1 includes a combustion unit 2 that is a combustion element that mixes and combusts fuel gas and air, a heat exchanger 10 that heats a heating medium by heat exchange with combustion gas generated by the combustion, a circulation passage 4 that connects the heat exchanger 10 to a heating terminal, a circulation pump 11 that circulates the heating medium to the circulation passage 4, and the like.
The heating hot water supply device 1 includes a first bypass passage 12 that branches from the circulation passage 4 and bypasses the heating terminal, a hot water supply heat exchanger 20 provided in the first bypass passage 12, a hot water supply passage 21 for supplying fresh water to the hot water supply heat exchanger 20 and supplying hot water heated by the hot water supply heat exchanger 20, and the like. A first distribution valve 15 as a distribution element is provided at a branching portion between the circulation passage 4 and the first bypass passage 12.
The heating hot water supply device 1 includes a control unit 7 that receives a detection signal from a temperature sensor or the like and operates the equipment to control a heating operation, a hot water supply operation, or the like, and a box-shaped housing 8 that houses the equipment or the like.
Next, the combustion section 2 will be described.
The combustion unit 2 includes an intake passage 40 for taking in air for combustion, a fuel gas passage 41 for supplying fuel gas supplied from the outside to the intake passage 40, a combustion fan 42 for feeding a mixed gas of air and fuel gas fed into the intake passage 40, a burner (burner)43 for burning the mixed gas fed by the combustion fan 42, and the like.
The flow rate of the air for combustion is controlled by the rotation speed of the combustion fan 42. A Venturi mixer (Venturi mixer)44 is provided at the downstream end of the fuel gas passage 41, and the flow rate of the supplied fuel gas is controlled by the rotation speed of the combustion fan 42. An electromagnetic valve 45 is provided in the fuel gas passage 41, and the supply and stop of the fuel gas are performed by opening and closing the electromagnetic valve 45.
The burner 43 ignites the air-fuel mixture fed by the combustion fan 42 by an ignition device 46 provided below the burner 43 to start combustion. A combustion sensor 47 for detecting a combustion state is provided below the burner 43.
The heat exchanger 10 is disposed below the ignition device 46 and the combustion sensor 47. The heat exchanger 10, the burner 43, and the like are housed in a tank 48 that forms a passage for the combustion gas. In the burner 43, the combustion gas generated by the combustion of the mixed gas is sent to the heat exchanger 10, exchanges heat with the heating medium, and is then discharged to the outside through an exhaust passage 49 extending from the lower portion of the tank 48. An exhaust gas temperature sensor 50 capable of detecting the temperature of the discharged combustion gas is provided at the downstream end portion of the exhaust passage 49.
The heat exchanger 10 includes a primary heat exchanger 10a that recovers sensible heat of the combustion gas, and a secondary heat exchanger 10b that recovers latent heat of the combustion gas. The two heat exchangers are connected in such a manner that the heating medium heated by the secondary heat exchanger 10b is further heated by the primary heat exchanger 10 a. A drain passage 51 for discharging drain water (drain water) generated in the secondary heat exchanger 10b to the outside is provided at the bottom of the tank 48. A drain trap (trap)52 for preventing outflow of the combustion gas is provided at a downstream end portion of the drain passage 51.
Next, the circulation path 4 will be explained.
A first temperature sensor 13 capable of detecting the temperature of the heating medium flowing into the heat exchanger 10 is provided between the circulation pump 11 provided in the circulation passage 4 and the heat exchanger 10. A second temperature sensor 14 capable of detecting the temperature of the heating medium heated by the heat exchanger 10 is provided on the downstream side of the heat exchanger 10.
A first distribution valve 15 is provided at a branching portion (first branching portion) of the first bypass passage 12 branching from the circulation passage 4 on the downstream side of the heat exchanger 10. The first distribution valve 15 can distribute the heating medium heated by the heat exchanger 10 to the circulation passage 4 and the first bypass passage 12 by adjusting the distribution ratio. The first bypass passage 12 merges with the circulation passage 4 on the upstream side of the circulation pump 11.
Between the heat exchanger 10 and the first distribution valve 15, a pressure release valve 16 that releases the pressure in the circulation passage 4 is provided. A heating return temperature sensor 17 capable of detecting the temperature of the heating medium returned from the heating terminal is provided upstream of the circulation pump 11. A supply passage 18 for supplying the heating medium is connected between the circulation pump 11 and the heating return temperature sensor 17.
Next, the hot water supply heat exchanger 20 will be described.
The hot water supply heat exchanger 20 provided in the first bypass passage 12 is a plate heat exchanger. In a plate heat exchanger, a plurality of heat exchange plates are stacked, and passages are formed between the heat exchange plates. In the hot water supply heat exchanger 20, the heating medium and the hot water supply water are provided and flow through every other passage between the heat exchange plates so as to face each other without being mixed with each other. The heat exchange plates are formed with projections and depressions to increase the surface area and improve the heat exchange efficiency.
Next, the hot water supply passage 21 will be explained.
The hot water supply passage 21 is capable of supplying clean water to the hot water supply heat exchanger 20 and supplying hot water heated by the hot water supply heat exchanger 20 to a hot water supply tap or the like, and includes a second bypass passage 22 branched from the hot water supply passage 21 and bypassing the hot water supply heat exchanger 20. A second distribution valve 23 corresponding to a flow rate adjusting element is provided at a branch portion (second branch portion) between the hot water supply passage 21 and the second bypass passage 22. The second distribution valve 23 can adjust the distribution ratio to distribute the fresh water to the hot water supply passage 21 and the second bypass passage 22. Therefore, the second distribution valve 23 can adjust the flow rate of the fresh water flowing through the hot water supply passage 21.
A flow rate adjustment valve 24, a hot water supply amount sensor 25, and a feed water temperature sensor 26 are provided on the upstream side of the second distribution valve 23. The flow rate adjustment valve 24 can adjust the flow rate of the fresh water flowing into the second distribution valve 23. The hot water supply amount sensor 25 corresponds to a flow rate detecting element, and is capable of detecting the flow rate of the fresh water. The incoming water temperature sensor 26 is able to detect the temperature of the fresh water flowing into the second distribution valve 23.
A hot water outlet temperature sensor 27 is provided between the hot water supply passage 21 and the hot water supply heat exchanger 20 at the junction with the second bypass passage 22. The hot water outlet temperature sensor 27 can detect the temperature of the hot water exiting from the hot water supply heat exchanger 20. A hot water supply temperature sensor 28 is provided downstream of the junction of the hot water supply passage 21 and the second bypass passage 22. The hot water supply temperature sensor 28 can detect the temperature of the hot water in which the hot water heated by the hot water supply heat exchanger 20 is mixed with the fresh water flowing through the second bypass passage 22.
Next, the control unit 7 will be explained.
The control unit 7 is capable of receiving a detection signal from a temperature sensor or the like provided in the heating hot water supply apparatus 1 and controlling and connecting the circulation pump 11, the first distribution valve 15, and the like, but is not shown. The communication device is connected to an operation device installed indoors so as to be able to communicate with the operation device. The operation device includes, for example, a display unit capable of displaying a temperature, an operation state, and the like, and an operation unit for performing an operation of setting a heating temperature or a hot water supply temperature, an operation of starting and stopping a heating operation, and the like.
Next, the operation and effect of the heating hot water supply apparatus 1 will be described with reference to fig. 1 to 3.
When the heating operation is started, the controller 7 adjusts the first distribution valve 15 so that the heating medium is circulated only to the circulation passage 4, operates the circulation pump 11 so that the heating medium is circulated to the circulation passage 4, and operates the combustion fan 42 and the ignition device 46 so that the mixture gas is burned in the burner 43. The generated combustion gas heats the heating medium in the heat exchanger 10. During the heating operation, the controller 7 adjusts the second distribution valve 23 so as to block the hot water supply passage 21 and open the second bypass passage 22. By continuing the heating operation, the heating medium is circulated at a predetermined temperature.
Fig. 2 is a graph showing an example of the temperature detected by the hot water outlet temperature sensor 27 and the hot water supply temperature sensor 28 before and after the start of the hot water supply operation in the heating operation, and the temporal change in the opening degree of the second distribution valve 23. The opening degree of the second distribution valve 23 is expressed in terms of the number of stages (step) on the second vertical axis, and for example, the fully closed state blocking the hot water supply passage 21 is 1700 stages, and the ratio of the opening degree of the second distribution valve 23 is 2: the state of 3 being distributed to the hot water supply passage 21 and the second bypass passage 22 is 1000 stages. The temperature of the clear water at this time was 22 ℃.
During the heating operation, a part of the circulated heating medium flows out of the first distribution valve 15 and flows into the first bypass passage 12. The hot water in the hot water supply passage is heated by the hot water supply heat exchanger 20 by the heating medium, the temperature of the hot water in the hot water supply passage 21 detected by the hot water outlet temperature sensor 27 near the hot water supply heat exchanger 20 rises by about 64 ℃, and the temperature of the hot water detected by the hot water supply temperature sensor 28 becomes about 33 ℃. Although not shown, the hot water supply passage 21 is blocked by the second distribution valve 23, and the temperature of the hot water heated by the hot water supply heat exchanger 20 is lower at a position upstream of the second distribution valve 23 because heat transfer to the hot water upstream of the second distribution valve 23 is suppressed.
In fig. 2, the hot water supply is started at about 3 seconds after the elapse of time, but when the hot water supply tap is turned on and the like, the hot water supply water amount sensor 25 detects a flow rate equal to or higher than a predetermined flow rate, the hot water supply operation is started. The controller 7 adjusts the first distribution valve 15 so that the heating medium is circulated only to the first bypass passage 12, and heats the hot water in the hot water supply heat exchanger 20 by the heating medium. After the hot water supply operation is started, for example, the hot water supply passage 21 is also blocked for 1 second, and therefore, the fresh water whose temperature increase is suppressed on the upstream side of the second distribution valve 23 is supplied with hot water through the second bypass passage 22. Therefore, the hot water having an increased temperature on the upstream side of the hot water supply temperature sensor 28 is supplied, the hot water supply temperature increases by about +4 ℃, but the rising amplitude thereof is small, and the hot water is immediately supplied to the fresh water passing through the second bypass passage 22, so that the hot water having a high temperature can be prevented from coming out.
Next, the control unit 7 gradually adjusts the opening degree of the second distribution valve 23 from 1700 to 1000, for example, after 3 seconds, so that the fresh water gradually flows into the hot water supply passage 21 after 1 second, for example, has elapsed from the start of the hot water supply. Since the hot water of high temperature in the hot water supply heat exchanger 20 is gradually discharged, the hot water discharge temperature rises. However, since the hot water of high temperature from the hot water is mixed with the clean water of low temperature, the range of increase in the hot water supply temperature is suppressed to be small.
Since the hot water in the hot water supply passage 21 whose temperature has increased during the heating operation is mixed with the fresh water passing through the second bypass passage and the hot water is supplied little by little, it is possible to avoid the hot water in the hot water supply passage 21 whose temperature has increased during the heating operation from coming out of the hot water at a high temperature. When it is determined that the heating hot-water supply simultaneous operation is possible based on the hot-water supply set temperature, the hot-water exit temperature detected by the hot-water exit temperature sensor 27, or the like, the control unit 7 adjusts the distribution ratio of the first distribution valve 15 to perform the heating hot-water supply simultaneous operation.
Fig. 3 is a graph showing an example of a temporal change in the hot water outlet temperature and the hot water supply temperature when the hot water supply passage 21 is not blocked during the heating operation by fixing the second distribution valve 23 to the 1000 stages in order to reproduce the conventional heating hot water supply apparatus. The temperature of the clear water at this time was 24 ℃.
Since the hot water supply passage 21 is not blocked during the heating operation, convection occurs in the hot water supply heat exchanger 20 when the temperature of the hot water rises due to the heating medium, and the hot water of high temperature flows through the hot water supply passage 21 and the second bypass passage 22. Therefore, the heat is transferred to the upstream side and the downstream side of the hot water supply heat exchanger 20, and the hot water in the hot water supply passage 21 and the second bypass passage becomes high in temperature. The temperature of the hot water at the downstream side of the merging portion with the second bypass passage of the hot water supply passage 21 also increases due to the high-temperature hot water, and the temperature detected by the hot water supply temperature sensor 28 becomes about 49 ℃. Although not shown, the hot water is heated to a high temperature by the heat transfer similarly performed on the upstream side of the second distribution valve 23.
When the hot water supply is started at about 3 seconds elapsed in fig. 3, the hot water supply passage 21 is not blocked by the second distribution valve 23, and therefore the fresh water flowing into the second distribution valve 23 is distributed to the hot water supply passage 21 and the second bypass passage 22. Therefore, the hot water of high temperature in the hot water supply heat exchanger 20 comes out and the hot water temperature rises. When the hot water of high temperature is mixed with the hot water having an increased temperature passing through the second bypass passage 22 for about 6 seconds to supply hot water, the hot water supply temperature increases. Since the temperature of the hot water mixed by passing through the second bypass passage 22 is high, the rise width is about +14 ℃, which is larger than the case of fig. 2. Therefore, in the case of fig. 3, the hot water supply at high temperature is continued for a period immediately after the start of the hot water supply, and the hot water supply temperature is greatly increased in the middle of the period, so that there is a risk that high-temperature hot water comes out.
As described above, in the heating hot water supply apparatus 1 according to the present invention, the hot water supply passage 21 is blocked by the second distribution valve 23 during the heating operation, so that the temperature rise of the hot water in the hot water supply passage 21 can be suppressed, and the hot water can be prevented from coming out at a high temperature. In the heating operation, the hot water in the hot water supply passage 21 whose temperature has risen is gradually mixed with the fresh water passing through the second bypass passage 22 to supply hot water, so that the hot water can be prevented from coming out at a high temperature.
Example 2
Next, a heating hot water supply apparatus 1A of example 2 will be described with reference to fig. 4.
The heating hot water supply device 1A is configured to be able to adjust the hot water supply flow rate by using the flow rate adjustment valve 23A provided in the hot water supply passage 21A and the bypass flow rate adjustment valve 24A provided in the second bypass passage 22A, instead of the second distribution valve 23, which is a flow rate adjustment element of the hot water supply passage 21 in example 1. The second bypass passage 22A branches off from between the flow rate adjustment valve 23A and the hot water supply amount sensor 25A.
Next, the operation and effect of the heating hot water supply apparatus 1A will be described.
During the heating operation, the controller 7A blocks the flow rate adjustment valve 23A and opens the bypass flow rate adjustment valve 24A to block the hot water supply passage 21A and open the second bypass passage 22A. Even if the temperature of the hot water in the hot water supply passage 21A is increased by the heating medium in the heating operation, the flow rate adjustment valve 23A is blocked, and therefore the temperature increase of the clean water on the upstream side of the flow rate adjustment valve 23A is suppressed.
When the hot water supply operation is started in this state, the fresh water whose temperature increase is suppressed is supplied through the second bypass passage 22A, so that the hot water of high temperature can be prevented from coming out at the start of hot water supply. The controller 7A adjusts the flow rate adjustment valve 23A so that a large amount of fresh water gradually flows into the hot water supply passage 21. Since the hot water in the hot water supply passage 21A, which has been raised in temperature during the heating operation, is supplied little by mixing with the clean water, it is possible to avoid hot water from coming out due to the hot water in the hot water supply passage 21A. When it is determined that the heating hot-water supply simultaneous operation is possible based on the hot-water supply set temperature, the hot-water exit temperature detected by the hot-water exit temperature sensor 27A, or the like, the control unit 7A performs the heating hot-water supply simultaneous operation by adjusting the distribution ratio of the first distribution valve 15A.
It is to be noted that those skilled in the art can implement the present invention in various ways by adding various modifications to the above-described embodiments without departing from the gist of the present invention, and the present invention includes such modifications.
Claims (3)
1. A heating hot water supply apparatus, comprising: a combustion element, a heat exchanger, a circulation passage connecting the heat exchanger and a heating terminal, a circulation pump provided in the circulation passage, a first bypass passage branching from the circulation passage and bypassing the heating terminal, a hot water supply heat exchanger provided in the first bypass passage, and a hot water supply passage for supplying fresh water to the hot water supply heat exchanger and supplying hot water heated by the hot water supply heat exchanger at a predetermined hot water supply set temperature,
in the heating hot water supply apparatus, the heating water supply unit,
a distribution element is provided in a first branch portion of the first bypass passage, the distribution element being capable of adjusting a distribution ratio so as to enable each of a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation,
a second bypass passage bypassing the hot water supply heat exchanger is provided in the hot water supply passage, a flow rate detecting element is provided at a position on an upstream side of a second branch portion of the second bypass passage, a flow rate adjusting element of the hot water supply passage is provided at the second branch portion or at a position on a downstream side of the second branch portion and on an upstream side of the hot water supply heat exchanger, and the hot water supply passage is blocked by the flow rate adjusting element during a heating operation,
the heating operation is switched to the hot water supply operation when the flow rate detecting element detects a flow rate equal to or higher than a predetermined flow rate, and the flow rate adjusting element blocks the hot water supply passage to a fully closed state for a predetermined number of seconds after the switching to the hot water supply operation, and opens the hot water supply passage by the flow rate adjusting element after the predetermined number of seconds has elapsed.
2. The heating hot water supply apparatus according to claim 1, wherein the flow rate adjustment member is a distribution valve provided in the second branch portion.
3. The heating hot water supply device according to claim 1, wherein the flow rate adjustment element is a flow rate adjustment valve provided on a downstream side of the second branch portion and on an upstream side of the hot water supply heat exchanger, a bypass flow rate adjustment valve is provided in the second bypass passage, and the bypass flow rate adjustment valve is opened during a heating operation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016146595 | 2016-07-26 | ||
| JP2016-146595 | 2016-07-26 | ||
| PCT/JP2017/019341 WO2018020805A1 (en) | 2016-07-26 | 2017-05-24 | Heating and hot water supplying device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109564007A CN109564007A (en) | 2019-04-02 |
| CN109564007B true CN109564007B (en) | 2021-06-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780046008.3A Active CN109564007B (en) | 2016-07-26 | 2017-05-24 | Heating hot water supply device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20190234653A1 (en) |
| CN (1) | CN109564007B (en) |
| AU (1) | AU2017304850B2 (en) |
| WO (1) | WO2018020805A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6745039B2 (en) * | 2016-11-25 | 2020-08-26 | 株式会社ノーリツ | Heating water heater |
| JP7198124B2 (en) * | 2019-03-14 | 2022-12-28 | リンナイ株式会社 | Heating water heater |
| JP7283029B2 (en) * | 2019-10-25 | 2023-05-30 | 株式会社ノーリツ | Heating water heater |
| IT202100010979A1 (en) * | 2021-04-30 | 2022-10-30 | Immergas Spa | COMBINED SYSTEM AND PROCESS FOR HEATING A PRIMARY WATER CIRCUIT |
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Also Published As
| Publication number | Publication date |
|---|---|
| AU2017304850A1 (en) | 2019-02-07 |
| WO2018020805A1 (en) | 2018-02-01 |
| CN109564007A (en) | 2019-04-02 |
| AU2017304850B2 (en) | 2020-06-11 |
| US20190234653A1 (en) | 2019-08-01 |
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