CN112710018A - Heating hot water supply device - Google Patents
Heating hot water supply device Download PDFInfo
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- CN112710018A CN112710018A CN202011083385.4A CN202011083385A CN112710018A CN 112710018 A CN112710018 A CN 112710018A CN 202011083385 A CN202011083385 A CN 202011083385A CN 112710018 A CN112710018 A CN 112710018A
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- heat exchanger
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 378
- 238000010438 heat treatment Methods 0.000 title claims abstract description 102
- 239000013505 freshwater Substances 0.000 claims abstract description 26
- 238000002485 combustion reaction Methods 0.000 claims description 35
- 238000000034 method Methods 0.000 description 7
- 239000000567 combustion gas Substances 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1066—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water
- F24D19/1069—Arrangement or mounting of control or safety devices for water heating systems for the combination of central heating and domestic hot water regulation in function of the temperature of the domestic hot water
-
- 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
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
-
- 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
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water 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
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
-
- 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
- F24H1/108—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 using solid fuel
-
- 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
- F24H9/00—Details
- F24H9/12—Arrangements for connecting heaters to circulation pipes
- F24H9/13—Arrangements for connecting heaters to circulation pipes for water heaters
-
- 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
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1809—Arrangement or mounting of grates or heating means for water heaters
- F24H9/1832—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1845—Arrangement or mounting of combustion heating means, e.g. grates or burners using solid fuel
-
- 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
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2057—Arrangement or mounting of control or safety devices for water heaters using solid fuel
-
- 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
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/02—Fluid distribution means
- F24D2220/0292—Fluid distribution networks
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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)
- Water Supply & Treatment (AREA)
- Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)
- Details Of Fluid Heaters (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
Abstract
A heating hot water supply apparatus comprising: the heat exchanger for heating a heat medium, a circulation passage and a circulation pump for connecting the heat exchanger and a heating terminal, a bypass passage branching from the circulation passage and bypassing the heating terminal, a distribution element of a branching portion of the bypass passage, a hot water supply heat exchanger disposed in the bypass passage, and a flow rate adjusting element of a bypass flow rate of the hot water supply bypass passage. The distribution element adjusts the distribution ratio to cope with each of the heating operation, the hot water supply operation, and the simultaneous heating and hot water supply operation, and performs a first hot water supply control for adjusting the hot water supply set temperature by adjusting the flow rate adjusting element when starting the hot water supply operation, and after maintaining the hot water supply at the hot water supply set temperature for a reference time or longer by the first hot water supply control, the control is shifted to a second hot water supply control for reducing the amount of mixed fresh water by bringing the hot water outflow temperature of the hot water supply heat exchanger close to the hot water supply set temperature.
Description
Technical Field
The present invention relates to a heating hot water supply device that has a heating operation function and performs a hot water supply operation using a heating medium for heating.
Background
Conventionally, in order to supply hot water at a set temperature for hot water supply, a hot water supply device has been widely used which supplies hot water at a temperature adjusted by mixing clean water with hot water obtained by heating clean water. For example, in the hot water supply device of patent document 1, in order to supply hot water at a set temperature for hot water supply, the temperature of hot water heated in the heat exchanger is adjusted by adjusting the heating capacity of the burner, and the hot water supply temperature is adjusted by adjusting the amount of fresh water mixed with the hot water.
Although the clear water contains mineral components such as calcium, the mineral components tend to be more easily precipitated as the temperature increases with increasing heating of the water. Therefore, the mineral components are precipitated and fixed as scale from the hot water heated in the heat exchanger, and the passage of the hot water is sometimes narrowed or clogged.
Further, since the portion where the scale is fixed interferes with heat exchange, the heat exchange efficiency is lowered to a high temperature, and damage may occur. Therefore, in an area where clean water from which scale is likely to precipitate is used, maintenance for removing scale from the hot water supply device is performed periodically or in accordance with the cumulative hot water supply amount or the like.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent No. 5200748 publication
Disclosure of Invention
Problems to be solved by the invention
On the other hand, a heating hot water supply apparatus is also widely used which performs a heating operation in which a heating medium for heating is heated and supplied to an external heating terminal, and a hot water supply operation in which hot water is supplied by heating clean water in a hot water supply heat exchanger using the heated heating medium. In such a heating hot water supply device, if fresh water containing a large amount of mineral components is heated, scale deposits in the heat exchanger for hot water supply, and the heat exchange efficiency is lowered, which is not preferable and may block the passage of hot water.
In particular, when the heating hot water supply device is configured to supply hot water by mixing clean water with hot water heated by a hot water supply heat exchanger for hot water supply, the clean water is heated to a high temperature in the hot water supply heat exchanger, and therefore, there is a problem in that precipitation of scale is accelerated.
The invention aims to provide a heating hot water supply device capable of inhibiting precipitation of scale.
Means for solving the problems
The heating hot water supply device according to the invention of claim 1 includes: a combustion element; a heat exchanger for heating a heating medium by using combustion heat of the combustion element; a heat medium circulation path connecting the heat exchanger and an external heating terminal; a circulation pump disposed in the circulation passage; a bypass passage that branches from the circulation passage and bypasses the heating terminal; a hot water supply heat exchanger disposed in the bypass passage; a water supply passage for supplying clean water to the hot water supply heat exchanger; and a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger, the heating hot water supply device including: a distribution element provided at a branch portion of the bypass passage; a hot water supply bypass passage branching from the water supply passage and connected to the hot water supply passage; and a flow rate adjusting element for adjusting a bypass flow rate of the hot water supply bypass passage, wherein the distribution element is capable of adjusting a distribution ratio for each of a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, performing a first hot water supply control of adjusting the flow rate adjusting element to mix fresh water with hot water heated by the hot water supply heat exchanger and adjusting the temperature to a hot water supply set temperature when starting a hot water supply operation, when the hot water supply at the set hot water supply temperature is maintained for a predetermined reference time or more by the first hot water supply control, the control is shifted to a second hot water supply control, the second hot water supply control reduces the amount of mixed fresh water by bringing the outflow temperature of the hot water heated by the hot water supply heat exchanger close to the hot water supply set temperature.
According to the above configuration, in the first hot water supply control, the hot water heated to a temperature higher than the set hot water supply temperature is mixed with the clean water, and the hot water is supplied by the hot water whose temperature has been adjusted. In the second hot water supply control, the hot water is supplied by heating the hot water supply heat exchanger so that the outflow temperature of the hot water becomes closer to the hot water supply set temperature than in the first hot water supply control, and by reducing the amount of mixed fresh water than in the first hot water supply control. Then, when the hot water supply is started, the hot water supply is performed under the first hot water supply control, and after the temperature of the hot water supply is stabilized, the flow of hot water is shifted to the second hot water supply control. Therefore, the temperature of the hot water heated by the hot water supply heat exchanger is reduced to a temperature close to the set temperature of hot water supply, and therefore, precipitation of scale from the heated hot water can be suppressed.
The heating hot water supply device according to claim 2 is the invention according to claim 1, wherein when the hot water supply flow rate is changed during the second hot water supply control, the control is shifted to the first hot water supply control.
According to the above configuration, although the hot water supply temperature varies if the hot water supply flow rate varies during the hot water supply in the second hot water supply control, the variation in the hot water supply temperature can be reduced by shifting to the hot water supply in the first hot water supply control. Therefore, the discomfort of the user of the hot water supply due to the variation of the hot water supply temperature can be reduced.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the heating hot water supply device of the present invention, deposition of scale can be suppressed.
Drawings
Fig. 1 is a diagram showing a configuration of a heating hot water supply apparatus according to an embodiment of the present invention.
Fig. 2 is a flowchart of a hot water supply operation according to an embodiment of the present invention.
Description of the symbols
1: heating hot water supply device
2: heating terminal
7: combustion part (combustion element)
8: heat exchanger
9: circulation path
10: circulating pump
11: bypass passage
15: first distribution valve (distribution element)
16: control unit
19: water supply passage
20: hot water supply heat exchanger
21: hot water supply passage
22: hot water supply bypass passage
23: second distribution valve (flow adjusting element)
25: flow sensor
26: water supply temperature sensor
27: hot water outflow temperature sensor
28: hot water supply temperature sensor
Detailed Description
Hereinafter, a mode for carrying out the present invention will be described based on examples.
The heating hot water supply apparatus 1 shown in fig. 1 performs a heating operation in which a heating medium heated by heat (combustion heat) of combustion gas generated in a combustion unit 7 (combustion element) is circulated to an external heating terminal 2. The heating hot water supply device 1 performs a hot water supply operation in which hot water is supplied by adjusting the temperature of the fresh water heated by the heat of the heating medium to a hot water supply set temperature. The heating hot water supply device 1 can also perform a heating hot water supply simultaneous operation in which the heating operation and the hot water supply operation are performed simultaneously.
The heating hot water supply device 1 includes a combustion unit 7, a heat exchanger 8, a circulation passage 9 connecting the heat exchanger 8 and the external heating terminal 2, a circulation pump 10 provided on the upstream side of the circulation passage 9 from the heat exchanger 8, a control unit 16 as a control element for controlling a heating operation and the like. The circulation pump 10 causes the heat medium to flow so as to be supplied to the heat exchanger 8 when the combustion unit 7 is burning.
The supply air indicated by the arrow AS and the fuel gas indicated by the arrow F are mixed and supplied to the combustion portion 7 by driving the combustion fan 7 a. The combustion heat generated by the combustion of the fuel gas in the combustion section 7 is adjusted by the rotation speed of the combustion fan 7 a. The heat exchanger 8 exchanges heat between the combustion gas generated in the combustion unit 7 and the heat medium flowing through the circulation passage 9. The heat medium is heated in the heat exchanger 8 to a preset target heat medium temperature (for example, 85 ℃). The combustion gas whose temperature has dropped due to the heat exchange is discharged to the outside as indicated by arrow E.
The heating hot water supply device 1 includes a bypass passage 11, a hot water supply heat exchanger 20 provided in the bypass passage 11, a water supply passage 19 and a hot water supply passage 21 connected to the hot water supply heat exchanger 20, and the like. The bypass passage 11 branches from the circulation passage 9 on the downstream side of the heat exchanger 8, bypasses the heating terminal 2 connected to the circulation passage 9, and is connected to the circulation passage 9 at a junction C1 on the upstream side of the circulation pump 10. Fresh water indicated by arrow CW is supplied from the water supply passage 19 to the hot water supply heat exchanger 20. The hot water heated by the hot water supply heat exchanger 20 is supplied from the hot water supply passage 21 to a hot water supply tap or the like as indicated by an arrow HW.
Next, the circulation path 9 will be explained.
In the circulation passage 9, a first temperature sensor 12 is disposed on the upstream side (heating terminal 2 side) of the junction C1 with the bypass passage 11, a second temperature sensor 13 is disposed between the circulation pump 10 and the heat exchanger 8, and a third temperature sensor 14 is disposed on the downstream side of the heat exchanger 8.
The first temperature sensor 12 detects the temperature of the heating medium for heating returned from the heating terminal 2 into the heat exchanger 8. The second temperature sensor 13 detects the temperature of the heat medium supplied to the heat exchanger 8. The third temperature sensor 14 detects the temperature of the heat medium heated by the heat exchanger 8. Based on the temperatures detected by these temperature sensors, the control unit 16 controls the combustion fan 7a and the circulation pump 10 so that the temperature of the heated heat medium becomes the target heat medium temperature.
A first distribution valve 15 (distribution element) is provided at a branching portion between the circulation passage 9 and the bypass passage 11. The first distribution valve 15 can adjust the distribution ratio to cope with the heating operation, the hot water supply operation, and the heating hot water supply simultaneous operation. The distribution ratio of the first distribution valve 15 is adjusted by the control portion 16.
The distribution ratio of the first distribution valve 15 is adjusted so that the heat medium is supplied only to the circulation passage 9 during the heating operation, and is adjusted so that the heat medium is supplied only to the bypass passage 11 during the hot water supply operation. In the simultaneous heating and hot water supply operation, the distribution ratio is adjusted so that hot water supply is prioritized, and the heat medium is supplied to the circulation passage 9 and the bypass passage 11 according to the distribution ratio.
The heat medium supplied to the circulation passage 9 is supplied to the external heating terminal 2 as indicated by an arrow HS. The heating medium supplied to the bypass passage 11 merges with the circulation passage 9 at the merging portion C1. A supply passage 18 for supplying the heating medium, indicated by an arrow AF, is connected between the circulation pump 10 and the first temperature sensor 12.
Next, the hot water supply heat exchanger 20, the water supply passage 19, and the hot water supply passage 21 will be described.
In the hot water supply heat exchanger 20, the fresh water is heated by heat exchange between the heat medium in the bypass passage 11 and the fresh water supplied from the water supply passage 19, and the heated hot water is supplied to the hot water supply passage 21. A hot water supply bypass passage 22 branches from the water supply passage 19, and a second distribution valve 23 whose distribution ratio can be adjusted is disposed at the branching portion. The fresh water supplied from the water supply passage 19 is distributed to the hot water supply heat exchanger 20 and the hot water supply bypass passage 22 by the second distribution valve 23. Therefore, the second distribution valve 23 serves as a flow rate adjusting element for adjusting the bypass flow rate of the hot water supply bypass passage 22.
In the water supply passage 19, a flow rate adjustment valve 24, a flow rate sensor 25, and a water supply temperature sensor 26 are disposed on the upstream side of the second distribution valve 23. The flow rate of the fresh water supplied to the second distribution valve 23 can be adjusted by the flow rate adjustment valve 24. The flow sensor 25 detects the flow rate of fresh water supplied to the second distribution valve 23, i.e., the hot water supply flow rate. The supply water temperature sensor 26 detects the temperature of the fresh water (supply water temperature).
The hot water supply bypass passage 22 branches from the water supply passage 19 so as to bypass the hot water supply heat exchanger 20, and is connected to the hot water supply passage 21 at a junction C2. A hot water outflow temperature sensor 27 is disposed between the hot water supply heat exchanger 20 and the junction C2 of the hot water supply passage 21. The hot water outflow temperature sensor 27 detects the temperature of the hot water heated by the hot water supply heat exchanger 20 (hot water outflow temperature).
A hot water supply temperature sensor 28 is disposed downstream of the junction C2 in the hot water supply passage 21. The hot water supply temperature sensor 28 detects the temperature of the hot water (hot water supply temperature) whose temperature has been adjusted by mixing the hot water heated by the hot water supply heat exchanger 20 with the fresh water in the hot water supply bypass passage 22. The control unit 16 controls the hot water supply operation so that the hot water supply temperature becomes a preset hot water supply set temperature.
Next, the control unit 16 will be explained.
The control unit 16 receives detection signals from various sensors such as the first temperature sensor 12 connected to the communication unit. Then, based on the received detection signal, the combustion fan 7a, the circulation pump 10, the first distribution valve 15, the second distribution valve 23, and the like are controlled, and the respective operations of the heating operation, the hot water supply operation, and the heating and hot water supply simultaneous operation are controlled.
The control unit 16 is connected to an operation terminal 17. The operation terminal 17 includes a display unit 17a capable of displaying information such as various temperatures and operation states, and a switch unit 17b for performing setting operations and the like. The operation terminal 17 is operated to set a hot water supply set temperature, a target heat medium temperature, and the like, and to start/stop a heating operation.
Next, the heating operation of the heating hot water supply device 1 will be described.
When the heating operation is started, the controller 16 burns the burner 7 to generate combustion gas, drives the circulation pump 10, and adjusts the distribution ratio of the first distribution valve 15 so that the heat medium is supplied only to the circulation passage 9. The heat medium is heated to the target heat medium temperature by the combustion heat of the combustion unit 7 in the heat exchanger 8. The heat medium is supplied to the heating terminal 2 for heating, and then returned to the heat exchanger 8 to be heated again. When the heating operation is stopped, the control unit 16 performs a heating operation stop operation such as stopping combustion in the combustion unit 7 and stopping the circulation pump 10.
Next, a hot water supply operation of the heating hot water supply apparatus 1 will be described with reference to the flowchart of fig. 2. Si (i ═ 1, 2, …) in the figure represents a step.
When the hot water supply tap is turned on to start the hot water supply and the flow rate sensor 25 detects a flow rate equal to or higher than the preset minimum operation flow rate, the hot water supply operation is started in S1, and the process proceeds to S2. Specifically, the distribution ratio of the first distribution valve 15 is adjusted so that the heat medium is supplied only to the bypass passage 11 and the heat medium is supplied to the hot water supply heat exchanger 20 by driving the circulation pump 10 while burning the burner 7.
Next, in S2, the hot water supply operation by the first hot water supply control is performed, and the process proceeds to S3. The control unit 16 receives the hot water outflow temperature detected by the hot water outflow temperature sensor 27 and the feed water temperature detected by the feed water temperature sensor 26. Then, the distribution ratio of the second distribution valve 23 is adjusted based on the received hot water outflow temperature and the received feed water temperature, and the mixing amount of the fresh water at the merging portion C2 is adjusted so that the hot water supply temperature detected by the hot water supply temperature sensor 28 approaches the hot water supply set temperature. In this way, in the first hot water supply control, the hot water supply is performed by adjusting the hot water supply temperature to the hot water supply set temperature by adjusting the mixing amount of the fresh water, and therefore, the controllability of the hot water supply temperature is excellent.
In the first hot water supply control, the heat medium is heated to the target heat medium temperature in the heat exchanger 8 by the combustion heat. The heated heat medium is supplied to the hot water supply heat exchanger 20, and the fresh water supplied from the water supply passage 19 to the hot water supply heat exchanger 20 is heated. The hot water heated by the hot water supply heat exchanger 20 flows out to the hot water supply passage 21.
The hot water outflow temperature detected by the hot water outflow temperature sensor 27 is higher than the hot water supply set temperature. For example, when the feed water temperature is 20 ℃ and the target heat medium temperature is 85 ℃, the hot water outflow temperature is 50 ℃ or higher, which is higher than the hot water supply set temperature that is usually set to be about 40 ℃. When the hot water supply set temperature is high, the supply amount of the heat medium at the target heat medium temperature to be supplied to the hot water supply heat exchanger 20 is increased to increase the hot water outflow temperature.
Next, at S3, it is determined whether or not the hot water supply temperature is maintained at the hot water supply set temperature for a reference time (for example, 10 seconds) or more. It is determined whether or not the hot water supply temperature of the first hot water supply control is stable, and it is determined as Yes (Yes) when the hot water supply temperature is maintained for a reference time or longer in a state where the difference between the hot water supply temperature and the hot water supply set temperature is within +/-0.5 ℃. If the determination is yes, the routine proceeds to S4, and if the determination is No (No), the routine proceeds to S6.
Next, in S4, the operation shifts to the hot water supply operation by the second hot water supply control, and the process proceeds to S5. In the second hot water supply control, the combustion heat generated in the combustion unit 7 is adjusted so that the temperature of the heat medium is lower than the target heat medium temperature in order to bring the hot water outflow temperature of the hot water supply heat exchanger 20 close to the hot water supply set temperature. Since the temperature of the heating medium supplied to the hot water supply heat exchanger 20 is lowered, the hot water outflow temperature approaches the hot water supply set temperature. In addition, the flow rate of the heat medium supplied to the hot water supply heat exchanger 20 can be reduced by controlling the driving of the circulation pump 10, and the hot water outflow temperature can be brought close to the hot water supply set temperature. Since the hot water outflow temperature, that is, the temperature of the hot water heated by the hot water supply heat exchanger 20 is lower than that in the first hot water supply control, deposition of scale in the hot water supply heat exchanger 20 is suppressed.
The distribution ratio of the second distribution valve 23 is adjusted to reduce the mixing amount of the fresh water so as to adjust the temperature or the flow rate of the heat medium and to set the mixing amount of the fresh water corresponding to the hot water outflow temperature. The amount of fresh water mixed in the second hot water supply control may be zero, but it is preferable to mix fresh water even if the amount is smaller than that in the first hot water supply control in order to control the hot water supply temperature.
Next, in S5, it is determined whether or not the hot water supply flow rate has varied. In the second hot water supply control, if the hot water supply flow rate detected by the flow rate sensor 25 varies and is determined to be Yes (Yes), the routine proceeds to S7, and if the determination is no, the routine returns to S4, and the second hot water supply control is continued.
On the other hand, if the determination at S3 is no, it is determined at S6 whether or not the hot water supply flow rate is fluctuating. In the first hot water supply control, if the hot water supply flow rate detected by the flow rate sensor 25 varies and it is determined as yes, the process proceeds to S7, and if it is determined as no, the process returns to S2, and the first hot water supply control is continued.
Next, at S7, it is determined whether or not the variation in the hot water supply flow rate is caused by the hot water supply end. For example, when the hot water supply tap is turned off and the flow rate sensor 25 does not detect a flow rate equal to or higher than the minimum operation flow rate, the hot water supply is terminated. If the determination is yes due to the end of the hot water supply, the process proceeds to S8, and if the determination is no due to the continuation of the hot water supply, the process returns to S2, and the hot water supply operation by the first hot water supply control is performed.
If there is a variation in the hot water supply flow rate in the second hot water supply control, the control system shifts to the first hot water supply control and continues the hot water supply operation if the hot water supply is not completed. If the hot water supply flow rate varies during the first hot water supply control, the hot water supply operation based on the first hot water supply control is continued if the hot water supply is not terminated. The variation of the hot water supply temperature caused by the variation of the hot water supply flow rate is reduced by the first hot water supply control having excellent hot water supply temperature controllability.
Next, in S8, the hot water supply operation stop operation is performed, and the hot water supply operation is ended. In the hot water supply operation stop operation, the combustion stop of the combustion unit 7, the drive stop of the circulation pump 10, and the like are performed, and the hot water supply operation is in a standby state until the next operation.
Next, the simultaneous heating hot water supply operation of the heating hot water supply apparatus 1 will be described.
In the simultaneous heating and hot water supply operation, the distribution ratio of the first distribution valve 15 is adjusted to distribute the heating medium heated to the target heating medium temperature to the circulation passage 9 and the bypass passage 11 in order to simultaneously perform the heating operation and the hot water supply operation. The distribution ratio of the first distribution valve 15 is adjusted so as to give priority to the hot water supply operation.
For example, when the heating operation is started in the hot water supply operation, the hot water supply operation in which the first hot water supply control is executed heats the heat medium to the target heat medium temperature. If there is a margin for the combustion heat that can be generated by the combustion unit 7, the distribution ratio of the first distribution valve 15 is adjusted so as to supply the heating medium to the heating terminal 2, and the simultaneous heating and hot water supply operation is performed.
On the other hand, when the hot water supply operation is started in the heating operation, the distribution ratio of the first distribution valve 15 is adjusted to supply the heat medium heated to the target heat medium temperature to the bypass passage 11, and the operation is shifted to the heating hot water supply simultaneous operation. In this case, the hot water is supplied at the set hot water supply temperature by the first hot water supply control with priority. Further, the combustion heat generated in the combustion part 7 is increased so that the heat medium mixed for heating and hot water supply can be heated to the target heat medium temperature.
The operation and effect of the heating hot water supply apparatus 1 of the above embodiment will be explained.
In the first hot water supply control, hot water heated to a temperature higher than the hot water supply set temperature is mixed with fresh water, and hot water is supplied using the hot water whose temperature has been adjusted. In the second hot water supply control, the hot water is supplied by heating so that the hot water outflow temperature of the hot water supply heat exchanger 20 is closer to the hot water supply set temperature than in the first hot water supply control, and by reducing the amount of mixed fresh water used for temperature adjustment. Then, the hot water supply is performed under the first hot water supply control at the start of the hot water supply, and after the hot water supply temperature is stabilized, the flow is shifted to the hot water supply under the second hot water supply control. Therefore, the temperature of the hot water heated by the hot water supply heat exchanger 20 is reduced to a temperature close to the hot water supply set temperature, and therefore, precipitation of scale from the hot water can be suppressed.
If the hot water supply flow rate varies during the hot water supply of the second hot water supply control, the hot water supply temperature varies, but the variation in the hot water supply temperature can be reduced by shifting to the hot water supply of the first hot water supply control. Therefore, the discomfort of the hot water supply user caused by the variation of the hot water supply temperature can be reduced.
When the operation of starting the heating operation is performed during the hot water supply operation, the hot water supply is prioritized, and therefore the heating operation may not be started until the hot water supply is completed. Further, those skilled in the art can implement the above embodiment in various modifications without departing from the spirit of the present invention, and the present invention includes such modifications.
Claims (2)
1. A heating hot water supply apparatus comprising: a combustion element; a heat exchanger for heating a heating medium by using combustion heat of the combustion element; a heat medium circulation path for connecting the heat exchanger to an external heating terminal; a circulation pump disposed in the circulation passage; a bypass passage that branches from the circulation passage and bypasses the heating terminal; a hot water supply heat exchanger disposed in the bypass passage; a water supply passage for supplying clean water to the hot water supply heat exchanger; and a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger, wherein the heating hot water supply device includes:
a distribution element provided at a branch portion of the bypass passage; a hot water supply bypass passage branching from the water supply passage and connected to the hot water supply passage; and a flow rate adjusting element for adjusting a bypass flow rate of the hot water supply bypass passage,
wherein the distribution member is capable of adjusting the distribution ratio to cope with each of the heating operation, the hot water supply operation, and the simultaneous heating and hot water supply operation,
performing a first hot water supply control of adjusting the flow rate adjusting element to mix fresh water with hot water heated by the hot water supply heat exchanger and adjusting the temperature to a hot water supply set temperature when starting a hot water supply operation,
when the hot water supply at the hot water supply set temperature is maintained for a predetermined reference time or longer by the first hot water supply control, the control is shifted to a second hot water supply control for reducing the amount of mixed fresh water by bringing the outflow temperature of the hot water heated by the hot water supply heat exchanger close to the hot water supply set temperature.
2. The heating hot water supply apparatus according to claim 1, wherein when a hot water supply flow rate varies during the second hot water supply control, the control is shifted to the first hot water supply control.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019194383A JP7283029B2 (en) | 2019-10-25 | 2019-10-25 | Heating water heater |
| JP2019-194383 | 2019-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112710018A true CN112710018A (en) | 2021-04-27 |
Family
ID=75542752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011083385.4A Withdrawn CN112710018A (en) | 2019-10-25 | 2020-10-12 | Heating hot water supply device |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20210123606A1 (en) |
| JP (1) | JP7283029B2 (en) |
| CN (1) | CN112710018A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07318156A (en) * | 1994-05-27 | 1995-12-08 | Brother Ind Ltd | Circulating warm bath |
| ITSV980016A1 (en) * | 1998-03-06 | 1999-09-06 | Riccardo Frigerio | ELECTRIC CONTROL SWITCH WITH NIGHT LIGHT SIGNAL FOR DOMESTIC OR SIMILAR USE. |
| JP2010038505A (en) * | 2008-08-08 | 2010-02-18 | Noritz Corp | Hot water supply device |
| CN101680682A (en) * | 2007-06-27 | 2010-03-24 | 大金工业株式会社 | Heat pump-type hot-water supply device |
| CN102116528A (en) * | 2010-01-04 | 2011-07-06 | 日立空调·家用电器株式会社 | Water heater of heat pump |
| US20120090560A1 (en) * | 2010-10-19 | 2012-04-19 | Takagi Industrial Co., Ltd. | Water heater and control method therefor |
| CN102954520A (en) * | 2011-08-26 | 2013-03-06 | 松下电器产业株式会社 | Heat pump hot water apparatus |
| CN103423808A (en) * | 2012-05-18 | 2013-12-04 | 松下电器产业株式会社 | Heat water supply device |
| CN105102902A (en) * | 2013-03-27 | 2015-11-25 | 松下知识产权经营株式会社 | Hot-water supply device |
| CN107436058A (en) * | 2016-05-26 | 2017-12-05 | 青岛经济技术开发区海尔热水器有限公司 | Heat exchanger and heat pump water heater with same |
| JP2018109481A (en) * | 2017-01-06 | 2018-07-12 | 株式会社ノーリツ | Heating water heater |
| CN109564007A (en) * | 2016-07-26 | 2019-04-02 | 株式会社能率 | Heat hot water supply apparatus |
| CN109564008A (en) * | 2016-07-26 | 2019-04-02 | 株式会社能率 | Heat hot water supply apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3947274B2 (en) * | 1997-07-29 | 2007-07-18 | 株式会社ガスター | Water heater |
| JP2005337632A (en) * | 2004-05-28 | 2005-12-08 | Noritz Corp | Heat source device |
| JP2018084395A (en) * | 2016-11-25 | 2018-05-31 | 株式会社ノーリツ | Heating water heater |
| AU2018200044A1 (en) * | 2017-01-06 | 2018-07-26 | Noritz Corporation | Heating device with hot water supply function |
-
2019
- 2019-10-25 JP JP2019194383A patent/JP7283029B2/en active Active
-
2020
- 2020-10-12 CN CN202011083385.4A patent/CN112710018A/en not_active Withdrawn
- 2020-10-12 US US17/067,769 patent/US20210123606A1/en not_active Abandoned
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07318156A (en) * | 1994-05-27 | 1995-12-08 | Brother Ind Ltd | Circulating warm bath |
| ITSV980016A1 (en) * | 1998-03-06 | 1999-09-06 | Riccardo Frigerio | ELECTRIC CONTROL SWITCH WITH NIGHT LIGHT SIGNAL FOR DOMESTIC OR SIMILAR USE. |
| CN101680682A (en) * | 2007-06-27 | 2010-03-24 | 大金工业株式会社 | Heat pump-type hot-water supply device |
| JP2010038505A (en) * | 2008-08-08 | 2010-02-18 | Noritz Corp | Hot water supply device |
| CN102116528A (en) * | 2010-01-04 | 2011-07-06 | 日立空调·家用电器株式会社 | Water heater of heat pump |
| US20120090560A1 (en) * | 2010-10-19 | 2012-04-19 | Takagi Industrial Co., Ltd. | Water heater and control method therefor |
| CN102954520A (en) * | 2011-08-26 | 2013-03-06 | 松下电器产业株式会社 | Heat pump hot water apparatus |
| CN103423808A (en) * | 2012-05-18 | 2013-12-04 | 松下电器产业株式会社 | Heat water supply device |
| CN105102902A (en) * | 2013-03-27 | 2015-11-25 | 松下知识产权经营株式会社 | Hot-water supply device |
| CN107436058A (en) * | 2016-05-26 | 2017-12-05 | 青岛经济技术开发区海尔热水器有限公司 | Heat exchanger and heat pump water heater with same |
| CN109564007A (en) * | 2016-07-26 | 2019-04-02 | 株式会社能率 | Heat hot water supply apparatus |
| CN109564008A (en) * | 2016-07-26 | 2019-04-02 | 株式会社能率 | Heat hot water supply apparatus |
| JP2018109481A (en) * | 2017-01-06 | 2018-07-12 | 株式会社ノーリツ | Heating water heater |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021067425A (en) | 2021-04-30 |
| JP7283029B2 (en) | 2023-05-30 |
| US20210123606A1 (en) | 2021-04-29 |
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Application publication date: 20210427 |
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