CN112912669A - Heating hot water supply device - Google Patents
Heating hot water supply device Download PDFInfo
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- CN112912669A CN112912669A CN201980070226.XA CN201980070226A CN112912669A CN 112912669 A CN112912669 A CN 112912669A CN 201980070226 A CN201980070226 A CN 201980070226A CN 112912669 A CN112912669 A CN 112912669A
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- hot water
- heating
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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
- F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
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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
- F24H1/48—Water heaters for central heating incorporating heaters for domestic water
- F24H1/52—Water heaters for central heating incorporating heaters for domestic water incorporating heat exchangers for domestic water
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- Water Supply & Treatment (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
Provided is a heating hot water supply device capable of expanding an operation range in which heating hot water supply simultaneous operation can be performed. A heating hot water supply apparatus comprising: a combustion element; a heat exchanger for heating the heating medium by using heat generated by the combustion element; a circulation path connecting an external heating terminal to the heat exchanger; a circulation element disposed in the circulation passage to circulate the heating medium; a bypass passage branching from the circulation passage and bypassing the heating terminal; a distribution element disposed at the branch portion of the bypass passage; a hot water supply heat exchanger disposed in the bypass passage; and a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a predetermined hot water supply set temperature, wherein the distribution element is capable of adjusting a distribution ratio of the heating heat medium to the circulation passage and the bypass passage so as to be capable of coping with a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, respectively, and the heating and hot water supply device includes a branch passage that branches from an outlet side passage portion of the hot water supply heat exchanger in the bypass passage and is connected to a heating forward passage portion between the distribution element in the circulation passage and the heating terminal.
Description
Technical Field
The present invention relates to a heating hot water supply device that heats a heating medium used for heating, supplies the heating medium to a heating terminal, and supplies hot water using the heating medium.
Background
Conventionally, a hot water supply device that performs heating using a heated heating medium and supplies hot water heated by the heat of the heating medium is used. For example, as shown in patent document 1, a heating hot water supply device is known which performs a heating operation and a hot water supply operation by switching a flow path of a heating medium. Further, as shown in patent document 2, for example, a heating hot water supply device is known which is configured to be capable of a heating hot water supply simultaneous operation in which a heating operation and a hot water supply operation are simultaneously performed by distributing a heating medium.
This heating hot water supply device includes: a combustion unit that burns fuel, a heat exchanger that performs heat exchange between the high-temperature combustion gas generated by the combustion unit and the heating medium, a hot water supply heat exchanger that performs heat exchange between the heating medium and hot water for hot water supply, and the like. In the heating operation, a heating medium is circulated between the heat exchanger and the heating terminal. In the hot water supply operation, hot water heated by the hot water supply heat exchanger is supplied via the heating medium.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 4477566
Patent document 2: japanese patent laid-open publication No. 2018-59650
Disclosure of Invention
Problems to be solved by the invention
In order to supply hot water at a hot water supply set temperature, it is necessary to supply a heating medium having a temperature higher than the hot water supply set temperature to the hot water supply heat exchanger on the hot water supply side. Therefore, when the hot water supply operation is started in the heating operation and the hot water at the hot water supply set temperature cannot be supplied at the temperature of the heating medium in the heating operation, the heating medium is set to a temperature higher than the temperature in the heating operation and higher than the hot water supply set temperature, and is supplied to the hot water supply side. When the simultaneous heating and hot water supply operation is performed, the high-temperature heating medium is also supplied to the heating side.
At this time, the heating medium having a high temperature is supplied to the heating side depending on the heating terminal, and thus a trouble may occur at the heating terminal or around the heating terminal. Therefore, when the temperature of the heating medium is too high, the heating medium is not supplied to the heating side, and the hot water supply operation is switched. Therefore, in the heating hot water supply device, the operation range in which the heating hot water supply simultaneous operation capable of supplying hot water at the hot water supply set temperature is possible is limited by the temperature of the heating medium, the upper limit temperature of the heating medium usable in the heating terminal (the upper limit temperature of the heating terminal), and the hot water supply set temperature.
The invention aims to provide a heating hot water supply device which can expand an operation area capable of supplying heating hot water and simultaneously operating.
Means for solving the problems
The heating hot water supply device of the first invention includes: a combustion element; a heat exchanger for heating a heating medium using heat generated by the combustion element; a circulation path connecting an external heating terminal to the heat exchanger; a circulation element disposed in the circulation passage to circulate a heating medium; a bypass passage branching from the circulation passage and bypassing the heating terminal; a distribution element disposed at a branch portion of the bypass passage; a hot water supply heat exchanger disposed in the bypass passage; and a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a predetermined hot water supply set temperature, wherein the heating hot water supply device is characterized in that: the distribution element may adjust a distribution ratio of the heating medium to the circulation passage and the bypass passage so as to be capable of coping with a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, respectively, and the heating and hot water supply device may include a branch passage that branches from an outlet-side passage portion of the hot water supply heat exchanger in the bypass passage and is connected to a heating forward passage portion between the distribution element and the heating terminal in the circulation passage.
According to the above configuration, when the heating hot water supply simultaneous operation is performed, the heating medium having a temperature decreased by heating the hot water for hot water supply in the hot water supply heat exchanger can be supplied from the branch passage to the heating supply path unit. Therefore, the heating medium heated to a high temperature for hot water supply can be used for heating, and the heating medium can be supplied to the heating side while the temperature of the heating medium heated to a high temperature for hot water supply is reduced, so that the simultaneous heating and hot water supply operation can be performed, and the operation range in which the simultaneous heating and hot water supply operation can be performed can be expanded.
In a preferred first aspect, the method comprises: the heating system includes an on-off valve for opening and closing the branch passage, and the on-off valve is opened according to a temperature of a heating medium, an upper limit temperature of the heating terminal, and the hot water supply set temperature when the heating hot water supply simultaneous operation is performed.
According to the above configuration, the on-off valve is opened according to the temperature of the heating medium, the upper limit temperature of the heating terminal, and the hot water supply set temperature, and the operation range in which the simultaneous heating and hot water supply operation can be performed is expanded.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the heating hot water supply device of the present application, the operation range in which the heating hot water supply simultaneous operation can be performed can be expanded.
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 transition control of the simultaneous operation of heating hot water supply according to the embodiment of the present invention.
Fig. 3 is a map showing an operation region in which the simultaneous heating and hot water supply operation can be performed according to the embodiment of the present invention.
Detailed Description
Hereinafter, embodiments for carrying out the present invention will be described based on examples.
Examples
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 is configured to be capable of performing a heating operation in which a heating medium heated by combustion heat of the combustion unit 2 is circulated between the heating terminal 31 provided outside the heating hot water supply device 1, a hot water supply operation in which hot water is supplied by adjusting the temperature of the hot water to a hot water supply set temperature by heat of the heating medium, and a heating hot water supply simultaneous operation in which the heating operation and the hot water supply operation are simultaneously performed, respectively.
The heating hot water supply device 1 includes: a combustion part 2 as a combustion element, a heat exchanger 10, a circulation passage 4 connecting the heat exchanger 10 to an external heating terminal 31, a circulation pump 11 as a circulation element of the heating medium provided on the inlet side (upstream side) of the heat exchanger 10 of the circulation passage 4, and the like. The combustion unit 2 includes a combustion blower 3, and a mixed gas, which is supplied by mixing intake air indicated by an arrow AS with fuel gas indicated by an arrow F by the combustion blower 3, is combusted in the combustion unit 2. The amount of combustion gas and the amount of combustion heat generated are adjusted by the rotation speed of the combustion fan 3. The heat exchanger 10 exchanges heat between the combustion gas generated by the combustion unit 2 and the circulating heating medium to heat the heating medium to a predetermined temperature. 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 first bypass passage 12 (bypass passage), a hot water supply heat exchanger 20 provided in the first bypass passage 12, a water supply passage 19, a hot water supply passage 21, and the like. The first bypass passage 12 branches from the circulation passage 4 on the outlet side (downstream side) of the heat exchanger 10 so as to bypass the heating terminal 31, and is connected to the circulation passage 4 on the inlet side (upstream side) of the circulation pump 11. The water supply passage 19 supplies the hot water supply heat exchanger 20 with the supply water as indicated by an arrow CW. The hot water supply passage 21 supplies the hot water heated by the hot water supply heat exchanger 20 to a hot water supply tap or the like as indicated by an arrow HW.
Next, the circulation path 4 will be explained.
The circulation passage 4 includes a first temperature sensor 13 between the circulation pump 11 and the heat exchanger 10, and includes a second temperature sensor 14 on the outlet side of the heat exchanger 10. The first temperature sensor 13 detects the temperature of the heating medium flowing into the heat exchanger 10. The second temperature sensor 14 detects the temperature of the heating medium heated by the heat exchanger 10.
A first distribution valve 15, which is a distribution element of the circulating heating medium, is provided at a branch portion of the first bypass passage 12 that branches from the circulation passage 4 on the outlet side of the heat exchanger 10. The first distribution valve 15 distributes the heating medium heated by the heat exchanger 10 to the heating forward passage portion 4a and the first bypass passage 12 between the first distribution valve 15 and the heating terminal 31 in the circulation passage 4. The distribution ratio of the first distribution valve 15 can be adjusted, and thus the heating operation, the hot water supply operation, and the simultaneous heating and hot water supply operation can be separately coped with. The heating medium distributed to the heating-side heating supply passage unit 4a is supplied to the heating terminal 31, and the heating medium distributed to the hot-water supply-side first bypass passage 12 is supplied to the hot-water supply heat exchanger 20.
Further, the heating hot water supply device 1 includes a branch passage 32, and the branch passage 32 is branched from the outlet-side passage portion 12a of the hot water supply heat exchanger 20 in the first bypass passage 12 and connected to the heating forward passage portion 4 a. An on-off valve 33 (e.g., an electromagnetic valve) for opening and closing the branch passage 32 is disposed in the branch passage 32. The on-off valve 33 is opened in response to the temperature of the heating medium (heating medium set temperature) set in the heating hot water supply simultaneous operation, the upper limit temperature of the heating medium that can be used in the heating terminal 31 (upper limit temperature of the heating terminal), and the hot water supply set temperature.
When the on-off valve 33 is opened, a part of the heating medium that has been heat-exchanged by the hot water supply heat exchanger 20 and has decreased in temperature is mixed with the heating medium flowing through the heating supply passage unit 4a via the branch passage 32. Then, the heating medium whose temperature has dropped from the heating medium set temperature due to the mixing is supplied to the heating terminal 31, the temperature of the heating medium is detected by the heating supply temperature sensor 34, and the heating supply temperature sensor 34 is disposed in the heating supply path portion 4a on the heating terminal 31 side of the connection portion of the branch path 32. The temperature α of the heating medium decreased by the mixing is set based on a mixing experiment performed by changing the conditions such as the hot water supply set temperature and the hot water supply flow rate in advance.
Between the heat exchanger 10 and the first distribution valve 15, a pressure release valve 16 is provided for releasing the pressure in the circulation passage 4. A heating return temperature sensor 17 that detects the temperature of the heating medium returned from the heating terminal 31 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 as indicated by an arrow R.
Next, the hot water supply heat exchanger 20 will be described.
The hot water supply heat exchanger 20 is a plate heat exchanger, and a passage is formed between a plurality of stacked heat exchange plates. In the hot water supply heat exchanger 20, the heating medium and the feedwater supplied from the water supply passage 19 flow through every other passage between the heat exchange plates so as to face each other without mixing with each other. The heat exchange plate is formed with projections and depressions to enlarge a surface area and improve heat exchange efficiency.
Next, the water supply passage 19 and the hot water supply passage 21 will be described.
The water supply passage 19 includes: a second distribution valve 23, a flow rate adjustment valve 24, a hot water supply flow rate sensor 25, and a feed water temperature sensor 26. The water supply passage 19 is supplied with the water supply by opening a hot water supply tap or the like as indicated by an arrow CW. The second bypass passage 22 branches from the water supply passage 19, and a second distribution valve 23 disposed at the branching portion distributes the feed water to the water supply passage 19 and the second bypass passage 22, and the distribution ratio thereof can be adjusted. The flow rate adjustment valve 24 adjusts the flow rate of the feedwater into the second distribution valve 23. The hot water supply flow rate sensor 25 detects the flow rate of the feedwater supplied to the second distribution valve 23. The inlet water temperature sensor 26 detects the temperature of the inlet water to the second distribution valve 23.
The hot water supply passage 21 is connected to a second bypass passage 22 at the junction C. A hot water outflow temperature sensor 27 is provided between the joining portion C and the hot water supply heat exchanger 20, and detects the temperature of the hot water for hot water supply heated by the hot water supply heat exchanger 20. A hot water supply temperature sensor 28 is provided at the downstream end of the hot water supply passage 21, and detects the hot water supply temperature of the hot water supplied by mixing the hot water for hot water supply heated by the hot water supply heat exchanger 20 and the feedwater flowing through the second bypass passage 22. In the hot water supply operation, the second distribution valve 23 and the like are controlled so that the hot water supply temperature becomes the hot water supply set temperature.
Next, the control unit 5 will be explained.
The heating hot water supply device 1 includes a control unit 5 that controls a heating operation and the like. An operation terminal 6 for performing setting operation of the heating hot water supply apparatus 1 and the like is communicably connected to the control unit 5. The operation terminal 6 is disposed in a room heated by the heating terminal 31, and includes a display unit 7 capable of displaying a temperature, an operation state, and the like, an on-off unit 8 for performing a setting operation of a heating temperature or a hot water supply temperature, a starting operation of a heating operation, and the like, and a voice output unit, not shown, for outputting an alarm sound and the like. Further, an outside air temperature sensor 30 disposed outdoors is communicably connected to the control unit 5.
The control section 5 is connected as follows: the temperature detected by the first temperature sensor 13 or the like, the rotation speed of the combustion blower 3 or the circulation pump 11, and the like can be received, and the rotation speed of the combustion blower 3 or the circulation pump 11, the distribution ratio of the first distribution valve 15, and the like can be adjusted. Thus, each of the heating operation, the hot water supply operation, and the heating and hot water supply simultaneous operation is controlled.
The control unit 5 determines whether or not the heating hot-water supply simultaneous operation is possible based on the detected temperature, the hot-water supply set temperature, or the like, so that when both heating and hot-water supply are requested, the hot-water supply can be prioritized and heating can be performed. When it is determined that the simultaneous heating and hot water supply operation is possible, the simultaneous heating and hot water supply operation is performed, and when it is determined that the simultaneous heating and hot water supply operation is not possible, the hot water supply operation is performed.
Next, the heating terminal 31 will be explained.
The heating terminal 31 is a known heating apparatus such as a floor heating apparatus having a heat transfer pipe for transferring heat of a heating medium to a floor of a room, or a radiator for naturally convecting air heated by heat of the heating medium. Since the upper limit temperature of the heating medium that can be used (the upper limit temperature of the heating terminal 31) may vary depending on the type of the heating terminal 31, the upper limit temperature of the heating medium supplied from the heating hot water supply device 1 to the heating terminal 31 is set at the time of, for example, connecting the heating terminal 31 to the heating hot water supply device 1. Here, the upper limit temperature is set to, for example, 70 ℃, but is not limited thereto.
Next, the heating operation will be described.
For example, when the operation terminal 6 starts the heating operation, the controller 5 starts the heating operation to burn the burner 2, and drives the circulation pump 11 to adjust the distribution ratio of the first distribution valve 15 so that the heating medium heated by the heat exchanger 10 flows through the heating supply path 4 a. Then, the heating medium heated by the heat exchanger 10 is supplied to the heating terminal 31, and the heating medium returned from the heating terminal 31 is heated by the heat exchanger 10. The heating medium circulates between the heat exchanger 10 and the heating terminal 31, and the circulation of the temperature increase in the heat exchanger 10 and the temperature decrease due to the heat radiation in the heating terminal 31 is repeated. The temperature of the heating medium heated by the heat exchanger 10, that is, the temperature set for the heating medium that is the target temperature after heating is set to a temperature equal to or lower than the upper limit temperature of the heating terminal 31 and set according to the set room temperature of heating, and the temperature is set to, for example, 60 ℃.
Next, the hot water supply operation will be described.
When the hot water supply flow rate sensor 25 detects a flow rate equal to or greater than a predetermined value set in advance by opening the hot water supply tap or the like, the controller 5 starts the hot water supply operation to burn the burner 2, drives the circulation pump 11, and adjusts the distribution ratio of the first distribution valve 15 so that the heating medium heated by the heat exchanger 10 flows through the first bypass passage 12 in order to supply the heating medium to the hot water supply heat exchanger 20. The heating medium is heated by the heat exchanger 10 to a temperature higher than the hot water supply set temperature so that hot water supply at the hot water supply set temperature can be achieved. For example, when the hot water supply set temperature is set to 40 ℃, the heating medium is heated to a temperature higher by a predetermined temperature β (for example, β ═ 15 ℃) than the hot water supply set temperature.
The heating medium heated by the heat exchanger 10 exchanges heat with the hot water supplied from the water supply passage 19 by the hot water supply heat exchanger 20, and then flows into the circulation passage 4 from the outlet side passage portion 12a and returns to the heat exchanger 10. The hot water heated by the hot water supply heat exchanger 20 is adjusted to a hot water supply set temperature in the hot water supply passage 21 and supplied to a hot water supply tap or the like. At this time, the distribution ratio of the second distribution valve 23 is adjusted based on the detected temperatures of the inlet water temperature sensor 26 and the hot water outflow temperature sensor 27 so that the detected temperature of the hot water supply temperature sensor 28 becomes the hot water supply set temperature, and the hot water heated to the hot water supply set temperature or higher by the hot water supply heat exchanger 20 is mixed with the upper water of the second bypass passage 22 in the hot water supply passage 21 and supplied to the hot water supply tap or the like. The distribution ratio of the second distribution valve 23 and the like may be further adjusted based on the detected temperature of the hot water supply temperature sensor 28.
Next, the heating hot water supply simultaneous operation will be described.
The heating and hot water supply simultaneous operation is to perform the heating operation and the hot water supply operation simultaneously when both the heating and the hot water supply are requested, and the heating medium heated by the heat exchanger 10 is distributed to the heating side and the hot water supply side by the first distribution valve 15, and the heating medium is supplied to the heating terminal 31 and the hot water supply heat exchanger 20, respectively. In general, the hot water supply operation is performed for a shorter operation time than the heating operation, and each time the hot water supply operation is performed by the user. Therefore, in most cases, the heating operation is shifted to the heating hot water supply simultaneous operation, and therefore, a case where the heating operation is shifted to the heating hot water supply simultaneous operation will be described.
In the heating operation in which the heating medium set temperature is set to, for example, 60 ℃, the hot water supply operation is started, and in the case where the hot water supply set temperature is, for example, 40 ℃, the temperature of the heating medium is higher than the temperature that is already higher by the predetermined temperature β than the hot water supply set temperature. In this case, the hot water supply of the hot water supply set temperature is preferentially performed to increase the temperature of the heating medium, and if possible, the operation is shifted to the simultaneous heating and hot water supply operation.
The control of the transition from the heating operation to the simultaneous heating and hot water supply operation is shown in the flowchart of fig. 2. In the figure, Si (i ═ 1, 2, · represents a step. Fig. 3 is a map showing an operation region used for the transition control. The vertical axis of the map represents the heating medium set temperature, and the horizontal axis represents the hot water supply set temperature, and the map represents an operation region in which the heating hot water supply simultaneous operation can be performed and an operation region in which the heating hot water supply simultaneous operation cannot be performed, which are determined by the heating medium set temperature and the hot water supply set temperature under the conditions of a constant hot water supply flow rate (for example, 8L/min) and water supply temperature (for example, 4 ℃). The control unit 5 has a plurality of maps created in advance based on experiments or the like under different conditions (hot water supply flow rate and supply water temperature), and uses the map corresponding to the condition for the heating hot water supply simultaneous operation. The transfer control will be described based on fig. 2 and 3.
First, in S1, it is determined whether or not hot water supply is started based on the detected flow rate of the hot water supply flow rate sensor 25. If the determination is Yes (Yes), the process proceeds to S2, and if the determination is No (No), the process returns to S1. If it is determined as yes, the flow rate is 8L/min and the feed water temperature is 4 ℃.
Next, at S2, it is determined based on the map of fig. 3 whether or not the hot water supply at the hot water supply set temperature can be achieved at the time of shifting to the heating and hot water supply simultaneous operation at the temperature of the heating medium in the current heating operation, that is, whether or not the heating and hot water supply simultaneous operation at the current heating medium set temperature can be performed. Fig. 3 shows an operation region in which the simultaneous heating and hot water supply operation can be performed and an operation region in which the simultaneous heating and hot water supply operation cannot be performed under the conditions in which the hot water supply flow rate is 8L/min and the feed water temperature is 4 ℃. The relationship between the heating medium set temperature and the maximum temperature of the hot water supply set temperature, at which the heating hot water supply simultaneous operation can be performed, is shown by a curve CL. The operating range Z below the curve CL is a range in which the simultaneous operation of heating hot water supply cannot be performed. If it is determined as yes, that is, if the simultaneous heating and hot water supply operation is possible at the current heating medium set temperature, the process proceeds to S3, and if it is determined as no, the process proceeds to S5.
Next, at S3, the operation is shifted to the heating hot water supply simultaneous operation at the current heating medium set temperature, and the process proceeds to S4, where it is determined at S4 whether or not the hot water supply is finished. The same applies to the determination of the end of hot water supply, in which the hot water supply is determined to be ended when the flow rate detected by the hot water supply flow rate sensor 25 is smaller than a predetermined value set in advance, and the subsequent determination step of the end of hot water supply is also performed. If it is determined as yes, that is, if the hot water supply is completed, the process returns to the heating operation, and if it is determined as no, the process returns to S4.
If the determination at S2 is no, that is, if the simultaneous heating and hot water supply operation cannot be performed at the current heating medium set temperature, the heating medium set temperature at which the simultaneous heating and hot water supply operation that can supply hot water at the hot water supply set temperature is selected based on the map of fig. 3 at S5, and the process proceeds to S6. For example, the heating medium set temperature of 62 ℃ at which hot water of 40 ℃ can be supplied is selected at the maximum, but a heating medium set temperature higher than this may be selected.
Next, in S6, it is determined whether or not the heating medium set temperature selected in S5 is equal to or lower than the upper limit temperature of the heating terminal 31. If it is determined as yes, the process proceeds to S7, and in S7, the process shifts to the simultaneous heating hot water supply operation using the heating medium of the heating medium set temperature selected in S5, and the process proceeds to S10. Then, in S10, it is determined whether or not the hot water supply is finished. If it is determined yes after the hot water supply is completed, the process proceeds to S11, and in S11, the heating medium set temperature is returned to the temperature before the operation shifts while the heating hot water supply is being performed, and the operation returns to the original heating operation. If the determination is no, the process returns to S10.
On the other hand, if the heating medium set temperature selected in S5 exceeds the upper limit temperature of the heating terminal 31 and the determination in S6 is no, the routine proceeds to S8. Then, in S8, when the operation is shifted to the heating hot water supply simultaneous operation at the heating medium set temperature selected in S5, it is determined whether or not the temperature of the heating medium supplied to the heating terminal 31 is equal to or lower than the upper limit temperature of the heating terminal 31 when the on-off valve 33 for opening and closing the branch passage 32 is opened. That is, it is determined whether or not the heating medium set temperature selected in S5 is equal to or lower than the upper limit temperature of the heating terminal 31 plus the drop temperature α caused by the mixing of the heating mediums via the branch passage 32. If the determination is yes, the process proceeds to S9, and if the determination is no, the process proceeds to S12.
In S9, the on-off valve 33 is opened, and the operation is shifted to the simultaneous operation of the heating hot water supply using the heating medium of the heating medium set temperature selected in S5, and the process proceeds to S10, and it is determined in S10 whether or not the hot water supply is completed. If it is determined yes after the hot water supply is completed, the process proceeds to S11, and in S11, the heating medium set temperature is returned to the temperature before the operation shifts while the heating hot water supply is being performed, and the operation returns to the original heating operation. If the determination is no, the process returns to S10.
If the determination at S8 is no, that is, if the heating medium set temperature selected at S5 is too high and the mixed heating medium is still above the upper limit temperature of the heating terminal 31 even through the branch passage 32, and therefore the simultaneous heating and hot water supply operation that enables hot water supply at the hot water supply set temperature cannot be performed, at S12, the distribution ratio of the first distribution valve 15 is adjusted to stop the supply of the heating medium to the heating side, and the process proceeds to S13.
Next, at S13, the operation shifts to a hot water supply operation using the heating medium of the heating medium set temperature selected at S5, and the process proceeds to S14, where it is determined at S14 whether the hot water supply is completed. If it is determined yes after the hot water supply is completed, the process proceeds to S15, and in S15, the heating medium set temperature is returned to the temperature before the hot water supply operation is shifted, and the operation returns to the original heating operation. If the determination is no, the process returns to S14.
The operation and effect of the heating hot water supply apparatus 1 according to the present invention will be described with reference to fig. 3.
For example, when hot water supply is started under the conditions of a hot water supply flow rate of 8L/min and a supply water temperature of 4 ℃ in a heating operation in which the heating medium set temperature is set to 60 ℃, the operation region X on the upper side of the curve CL in fig. 3 and on the lower side of the line L1 indicating 60 ℃ of the heating medium set temperature indicates a region in which the heating operation can be shifted to the heating hot water supply simultaneous operation while maintaining the heating medium set temperature, and hot water supply at the hot water supply set temperature can be realized. Since the maximum temperature of the hot water supply set temperature at which hot water supply can be performed by the simultaneous operation of heating hot water supply at the heating medium set temperature of 60 ℃ is 38 ℃ at which the straight line L1 intersects the curve CL, hot water supply at 38 ℃ or lower can be realized.
When the hot water supply set temperature is, for example, 40 ℃, even if the operation is shifted to the heating hot water supply simultaneous operation with the heating medium set temperature maintained during the heating operation, the hot water supply at 40 ℃ is not possible, and therefore, the maximum temperature of the hot water supply set temperature at which the hot water supply can be realized during the heating hot water supply simultaneous operation is increased by increasing the heating medium set temperature. For example, when the upper limit temperature of the heating terminal 31 is 70 ℃, the hot water supply set temperature at which the straight line LH indicating the upper limit temperature intersects the curve CL is 46 ℃. Therefore, the heating medium set temperature is set to 70 ℃, hot water supply at 46 ℃ or lower can be achieved, and the heating medium set temperature may be set to 62 ℃ or lower for hot water supply at 40 ℃, but may be set to a higher temperature than this and equal to or lower than the upper limit temperature of the heating terminal 31. The heating medium of the heating medium set temperature is supplied to each of the heating terminal 31 and the hot water supply heat exchanger 20.
The operation range Y' above the curve CL and below the line LH indicates an operation range in which hot water at the set hot water supply temperature can be supplied in the simultaneous heating and hot water supply operation using the heating medium at the upper limit temperature of the heating terminal 31. By increasing the heating medium set temperature to the upper limit temperature of the heating terminal 31, the operating range in which the heating hot water supply is simultaneously operated is expanded from the operating range X to the operating range Y', and thus hot water supply at a higher temperature than the operating range X can be achieved.
The heating hot water supply device 1 can reduce the temperature of the heating medium on the heating side by opening the on-off valve 33 and mixing the heating medium, which is used for hot water supply and has a reduced temperature, with the heating medium supplied to the heating terminal 31 through the branch passage 32. The drop temperature α of the heating medium on the heating side due to the mixing is set in advance by experiments or the like, and the heating medium set temperature may be raised to a limit higher than the upper limit temperature of the heating terminal 31 by the drop temperature α to perform the simultaneous heating and hot water supply operation.
When the hot water supply set temperature is, for example, 50 ℃, even if the heating medium set temperature is 70 ℃ higher than the upper limit temperature of the heating terminal 31 according to the map of fig. 3, the hot water supply at 50 ℃ cannot be performed by the simultaneous operation of the heating hot water supply. Therefore, by opening the on-off valve 33, the temperature of the heating medium supplied to the heating terminal 31 is maintained at the upper limit temperature of the heating terminal 31 or less, and the temperature of the heating medium supplied to the hot water supply heat exchanger 20 is set to a temperature higher than the upper limit temperature of the heating terminal 31, thereby increasing the maximum temperature of the hot water supply set temperature at which hot water supply can be realized in the heating and hot water supply simultaneous operation.
At this time, when the lower temperature decrease degree α is, for example, 5 ℃, the hot water supply set temperature at which the straight line L2 indicating a temperature (75 ℃) higher than the upper limit temperature (70 ℃) by the lower temperature decrease degree α (5 ℃) intersects the curve CL is 52 ℃. Therefore, the heating medium set temperature is set to 75 ℃, hot water supply at 52 ℃ or lower can be achieved, and the heating medium set temperature may be set to 73 ℃ or lower for hot water supply at 50 ℃, but may be set to a temperature higher than this and equal to or lower than the upper limit temperature plus the lower temperature α. The heating medium having the heating medium set temperature is supplied to the heating water supply heat exchanger 20, and the heating medium having the temperature not higher than the upper limit temperature is supplied to the heating terminal 31.
The operation range Y above the curve CL and below the line L2 indicates an operation range in which hot water at the hot water supply set temperature can be supplied in the heating hot water supply simultaneous operation using the heating medium at a temperature higher than the upper limit temperature of the heating terminal 31. By increasing the heating medium set temperature, the operating range in which the heating hot water is simultaneously operated is expanded from the operating range Y 'to the operating range Y, and thereby hot water supply at a higher temperature than the operating range Y' can be realized. Further, since the heating medium supplied to the heating terminal 31 is at a temperature equal to or lower than the upper limit temperature of the heating terminal 31, it is possible to prevent the occurrence of a problem caused by a heating medium having a high temperature exceeding the upper limit temperature.
When the hot water supply set temperature is changed to the high temperature side in the hot water supply simultaneous operation, it may be determined again whether the heating hot water supply simultaneous operation is possible or may be shifted to the hot water supply operation without determining, in the same manner as S2 and thereafter in fig. 2. When the hot water supply set temperature is changed to the low temperature side during the simultaneous heating and hot water supply operation, the adjustment of the distribution ratio of the second distribution valve 23 may be only performed to cope with the change, but the heating medium set temperature may be set to be suitable for the changed hot water supply set temperature.
When the heating medium set temperature is increased by shifting from the heating operation to the simultaneous heating and hot water supply operation, the opening/closing valve 33 may be opened to reduce the temperature change of the heating medium supplied to the heating terminal 31 even if the increased heating medium set temperature is equal to or lower than the upper limit temperature of the heating terminal 31. Instead of the opening/closing valve 33, a three-way valve may be provided at a branch portion from which the branch passage 32 branches from the outlet-side passage portion 12a, and the flow path of the heating medium for hot water supply may be switched from the outlet-side passage portion 12a on the downstream side of the branch portion to the branch passage 3 in accordance with the heating medium set temperature, the upper limit temperature of the heating terminal 31, and the hot water supply set temperature during the heating and hot water supply simultaneous operation.
When the heating operation is started in the hot water supply operation, since the hot water supply is preferentially performed, the operation may be shifted to the heating hot water supply simultaneous operation when there is a surplus in heating capacity, or the heating operation may be started after the hot water supply operation is ended. Further, it is possible for a person skilled in the art to implement the present invention 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.
Description of the symbols
1: heating hot water supply device
2: combustion part (combustion element)
4: circulation path
4 a: heating forward path part
5: control unit
10: heat exchanger
11: circulating pump (circulating element)
12: first bypass passage (bypass passage)
12 a: outlet side passage part
15: first distribution valve (distribution element)
19: water supply passage
20: heat exchanger for hot water supply
21: hot water supply passage
22: second bypass passage
23: second distribution valve
25: hot water supply flow sensor
26: inlet water temperature sensor
31: heating terminal
32: branch passage
33: opening and closing valve
34: heating temperature sensor
Claims (2)
1. A heating hot water supply apparatus comprising: a combustion element; a heat exchanger for heating a heating medium using heat generated by the combustion element; a circulation path connecting an external heating terminal to the heat exchanger; a circulation element that is provided in the circulation passage to circulate the heating medium; a bypass passage branching from the circulation passage and bypassing the heating terminal; a distribution element disposed at a branch portion of the bypass passage; a hot water supply heat exchanger disposed in the bypass passage; and a hot water supply passage for supplying hot water heated by the hot water supply heat exchanger at a predetermined hot water supply set temperature, wherein the heating hot water supply device is characterized in that:
the distribution member may adjust a distribution ratio of the heating medium to the circulation passage and the bypass passage so as to be separately adaptable to a heating operation, a hot water supply operation, and a simultaneous heating and hot water supply operation, and
the heating hot water supply device includes a branch passage that branches from an outlet-side passage portion of the hot water supply heat exchanger in the bypass passage and is connected to a heating forward passage portion between the distribution element and the heating terminal in the circulation passage.
2. The heating hot water supply apparatus according to claim 1, wherein: the heating system includes an on-off valve for opening and closing the branch passage, and the on-off valve is opened according to a temperature of a heating medium, an upper limit temperature of the heating terminal, and the hot water supply set temperature when the heating hot water supply simultaneous operation is performed.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-220920 | 2018-11-27 | ||
| JP2018220920A JP7229460B2 (en) | 2018-11-27 | 2018-11-27 | Heating water heater |
| PCT/JP2019/015298 WO2020110335A1 (en) | 2018-11-27 | 2019-04-08 | Heating and hot-water supply apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112912669A true CN112912669A (en) | 2021-06-04 |
Family
ID=70852753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980070226.XA Pending CN112912669A (en) | 2018-11-27 | 2019-04-08 | Heating hot water supply device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7229460B2 (en) |
| CN (1) | CN112912669A (en) |
| WO (1) | WO2020110335A1 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03175237A (en) * | 1989-08-30 | 1991-07-30 | Gold Star Co Ltd | Heating water and hot water circuit device of gas boiler |
| JP2004333059A (en) * | 2003-05-09 | 2004-11-25 | Kyungdong Boiler Co Ltd | Method of controlling heating with boiler by flow rate sensor |
| US20150300661A1 (en) * | 2012-12-12 | 2015-10-22 | Kyungdong Navien Co., Ltd. | Hot water-centered combined hot water and heating boiler |
| JP2017036889A (en) * | 2015-08-11 | 2017-02-16 | パーパス株式会社 | Premixing device and heat source device |
| JP2018185120A (en) * | 2017-04-27 | 2018-11-22 | 株式会社ノーリツ | Heating water heater and its control method |
-
2018
- 2018-11-27 JP JP2018220920A patent/JP7229460B2/en active Active
-
2019
- 2019-04-08 WO PCT/JP2019/015298 patent/WO2020110335A1/en active Application Filing
- 2019-04-08 CN CN201980070226.XA patent/CN112912669A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03175237A (en) * | 1989-08-30 | 1991-07-30 | Gold Star Co Ltd | Heating water and hot water circuit device of gas boiler |
| JP2004333059A (en) * | 2003-05-09 | 2004-11-25 | Kyungdong Boiler Co Ltd | Method of controlling heating with boiler by flow rate sensor |
| US20150300661A1 (en) * | 2012-12-12 | 2015-10-22 | Kyungdong Navien Co., Ltd. | Hot water-centered combined hot water and heating boiler |
| JP2017036889A (en) * | 2015-08-11 | 2017-02-16 | パーパス株式会社 | Premixing device and heat source device |
| JP2018185120A (en) * | 2017-04-27 | 2018-11-22 | 株式会社ノーリツ | Heating water heater and its control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7229460B2 (en) | 2023-02-28 |
| WO2020110335A1 (en) | 2020-06-04 |
| JP2020085351A (en) | 2020-06-04 |
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