JP7235195B2 - Heating water heater - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating and hot water supply apparatus that heats and supplies a heating medium used for heating, and that uses the heating medium to supply hot water.

Conventionally, as a heating terminal, for example, a heating and hot water supply apparatus that circulates and supplies a heated heating medium to a warm air heater and uses the heat of this heating medium to supply hot water collectively performs heating in the house. Used for central heating. For example, as in Patent Document 1, a heating and hot water supply apparatus is known that adjusts the amount of fuel supply according to the temperature of the heating medium after heating in order to adjust the amount of heat according to the respective values of the heating temperature and the hot water supply amount. ing.

A hot air heater is equipped with a heating heat exchanger and a blower that exchange heat between a heating medium and air. The warm air is sent indoors. As a heating terminal other than the hot-air heater, a radiator that performs heating using the radiant heat of the heating medium and the natural convection of the air is also often used.

A heating and hot water supply system consists of a combustion section that burns fuel, a heat exchanger that exchanges heat between the high-temperature combustion gas generated in this combustion section and the heating medium, and heat exchange between the heating medium and hot water for hot water supply. It is equipped with a hot water supply heat exchanger, etc. In the heating operation, the heating heat medium is circulated between the heat exchanger and the heating terminal. In the hot water supply operation, hot water heated by the heat exchanger for hot water supply by the heating heat medium is supplied.

Japanese Utility Model Laid-Open No. 49-48746

Normally, heating operation of central heating is continuous, for example, throughout the winter period, whereas hot water supply operation is performed only when hot water is supplied regardless of the season, and can be completed in a shorter time than heating operation. many. When hot water supply is started during heating operation and simultaneous heating and hot water supply operation is performed in which both heating operation and hot water supply operation are performed at the same time, the amount of heat supplied to the heating terminal decreases and the heating capacity decreases.

At this time, if the heating terminal is a radiator, even if the radiant heat is reduced, it is difficult for the human body to feel it. On the other hand, in the case where the heating terminal is a warm air heater as in Patent Document 1, the temperature of the warm air blown by the warm air heater drops, and the warm air with the lowered temperature hits the human body directly, causing coldness or the like. This is not preferable because it may cause discomfort.

SUMMARY OF THE INVENTION An object of the present invention is to provide a heating and hot water supply apparatus capable of suppressing a decrease in the temperature of hot air from a hot air heater when shifting from heating operation to simultaneous heating and hot water supply operation.

A heating and hot water supply apparatus of the invention of claim 1 comprises: a combustion means; a heat exchanger for heating a heating medium to a target temperature using heat generated by the combustion means; a circulation means provided in the circulation passage for circulating the heating heat medium; a bypass passage branched from the circulation passage and bypassing the heating terminal; and the circulation passage. a distribution means for distributing the heating heat medium to the bypass passage; a hot water supply heat exchanger provided in the bypass passage; a water supply passage for supplying tap water to the hot water supply heat exchanger; In a heating and hot water supply apparatus including a hot water supply passage for supplying hot water heated by a hot water supply heat exchanger at a predetermined hot water supply set temperature, the distribution means can correspond to heating operation, hot water supply operation, and heating and hot water supply simultaneous operation. When the heating operation is shifted to the simultaneous heating and hot water supply operation, if the heating terminal is a warm air heater, the target heating medium temperature is increased so that the heating terminal is The target heating medium temperature is not changed unless the heater is a warm air heater .

According to the above configuration, when the heating operation is shifted to the heating and hot water simultaneous operation, if the heating terminal is a warm air heater, the target heat medium temperature is increased, so the temperature of the heating heat medium heated by the heat exchanger becomes hotter than during heating operation. Therefore, even if the heating heat medium is distributed for the hot water supply operation and the flow rate of the heating heat medium supplied to the warm air heater decreases, the decrease in the amount of heat supplied to the warm air heater will be reflected by the temperature of the heating heat medium. Since it can be compensated for by the increase, it is possible to suppress the decrease in the temperature of the warm air from the warm air heater. In addition, when the heating terminal is other than the warm air heater, even if the flow rate of the heating medium decreases, it is difficult for the human body to feel it, so the target heating medium temperature is not changed.

According to a second aspect of the invention, there is provided a heating and hot water supply apparatus according to the first aspect of the invention, further comprising temperature detecting means for detecting the temperature of the heating medium returning from the heating terminal to the heat exchanger, wherein the temperature detecting means is lowered by a predetermined value or more due to a transition from the heating operation to the simultaneous heating and hot water supply operation, the target heat medium temperature is increased.

According to the above configuration, the temperature of the heating medium used for heating during the simultaneous operation of heating and hot water supply and returned to the heat exchanger is lower than the temperature during the heating operation by a predetermined value or more. heating heat medium is set to a higher temperature than during heating operation. When there is a risk that the temperature of the hot air from the hot air heater will drop significantly, the amount of heat supplied to the hot air heater can be increased by increasing the temperature of the heating medium, so the temperature of the hot air from the hot air heater can be increased. decline can be suppressed.

A heating and hot water supply apparatus according to a third aspect of the invention is characterized in that, in the second aspect of the invention, the temperature detecting means is disposed closer to the heating terminal than the junction of the circulation passage and the bypass passage. .

According to the above configuration, the temperature of the heating heat medium used for heating and returning to the heat exchanger before the heating heat medium used for hot water supply joins is detected, and the temperature of the hot air of the hot air heater is detected. It is possible to grasp the temperature required to suppress the decrease. Therefore, when raising the target heat medium temperature, it is possible to set an appropriate target heat medium temperature and suppress a decrease in the temperature of the hot air of the warm air heater.

According to the heating and hot water supply apparatus of the present invention, it is possible to suppress the temperature drop of the hot air of the hot air heater when shifting from the heating operation to the simultaneous heating and hot water supply operation.

It is a figure showing the whole hot water heating system composition concerning the example of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the structure of the heating hot water supply apparatus which concerns on the Example of this invention. 4 is a flowchart of target heat medium temperature increase control according to the embodiment of the present invention. It is a graph which shows the actual measurement example of the hot air temperature when control to raise the target heat medium temperature is performed.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on an Example.

First, the overall configuration of a hot water heating system 1 used for central heating will be described with reference to FIG.
The hot water heating system 1 supplies the heating medium (hot water) heated by the heating and hot water supply device 2 to the hot air heater 3 installed as a heating terminal outside the heating and hot water supply device 2, and the hot air heater 3 is installed in the house. It is configured to collectively heat the This hot water heating system 1 includes a heating and hot water supply device 2, a hot air heater 3, a heating circulation circuit 4 connecting these, an external pump 5 provided in the heating circulation circuit 4, and a heating heat medium due to temperature rise. A closed expansion tank 6 or the like provided in the heating circulation circuit 4 is provided to absorb volumetric expansion. Although illustration is omitted, in the case where a heating terminal is provided for each of a plurality of rooms in a dwelling and a heating medium is supplied to them, the plurality of heating terminals are connected to the heating circulation circuit 4 by the hot air heater 3 . connected in parallel with

The heating circulation circuit 4 includes a terminal circulation circuit portion 4a that circulates and supplies a heating heat medium to the heating terminal by driving an external pump 5, and supplies the heating heat medium from the terminal circulation circuit portion 4a to the heating and hot water supply apparatus 2, and supplies the heating heat medium to the heating and hot water supply apparatus. 2 to supply the heating medium heated in step 2 to the terminal circulation circuit portion 4a. The expansion tank 6 is provided upstream of the external pump 5 in the terminal circulation circuit portion 4a. The heating circulation circuit portion 4b is connected to the upstream side of the expansion tank 6 of the terminal circulation circuit portion 4a.

Next, the warm air heater 3 will be described.
The hot air heater 3 includes a heating heat exchanger 3a that exchanges heat between a heating medium and air, and a blower 3b that sends air to the heating heat exchanger 3a and blows warm air into the room as warm air. , a heating operation switch (not shown), and the like. It may be configured to allow setting of the heating set temperature and the like.

Next, the heating and hot water supply device 2 will be described with reference to FIG.
The heating and hot water supply device 2 performs a heating operation in which a heating heat medium heated by using combustion heat generated in the combustion unit 7 (combustion means) is circulated between the warm air heater 3 and heat of the heating heat medium. It is configured to perform a hot water supply operation in which hot water is supplied after adjusting the hot water supply temperature to the hot water set temperature, and a simultaneous heating and hot water supply operation in which both the heating operation and the hot water supply operation are performed.

The heating and hot water supply device 2 includes a combustion section 7, a heat exchanger 8, a circulation passage 9 connected to a heating circulation circuit section 4b of a heating circulation circuit 4 connecting the heat exchanger 8 and the hot air heater 3, A built-in pump 10 (circulating means) provided upstream of the heat exchanger 8 in the circulation passage 9 and a control section 16 for controlling heating operation and the like are provided. The built-in pump 10 circulates the heating medium in conjunction with the external pump 5 during the heating operation.

In the combustion section 7, a mixed gas, which is supplied by mixing the supply air indicated by arrow AS and the fuel gas indicated by arrow F, is combusted by driving the combustion fan 7a. The heat quantity (combustion heat quantity) of the combustion gas generated by the combustion of the combustion section 7 is adjusted by the rotational speed of the combustion fan 7a. The heat exchanger 8 exchanges heat between the combustion gas generated in the combustion section 7 and the heating heat medium flowing through the circulation passage 9 to heat the heating heat medium to a preset target heat medium temperature. The combustion gas, the temperature of which has been lowered by heat exchange, is discharged to the outside as indicated by an arrow E.

The heating and hot water supply device 2 also includes a first bypass passage 11 (bypass passage), a hot water supply heat exchanger 20 provided in the first bypass passage 11, a water supply passage 19, a hot water supply passage 21, and the like. . The first bypass passage 11 branches off from the circulation passage 9 on the downstream side of the heat exchanger 8 so as to bypass the heating terminal connected to the heating circulation circuit 4, and circulates at the junction C1 on the upstream side of the built-in pump 10. It is connected to passage 9 . The water supply passage 19 supplies tap water to the hot water supply heat exchanger 20 as indicated by an arrow CW. The hot water supply passage 21 supplies hot water heated by the hot water supply heat exchanger 20 to a hot water tap or the like as indicated by an arrow HW.

Next, the circulation passage 9 will be explained.
The circulation passage 9 is provided with a first temperature sensor 12 (temperature detection means) on the upstream side (heating terminal side) of the junction C1 with the first bypass passage 11, Two temperature sensors 13 are provided, and a third temperature sensor 14 is provided downstream of the heat exchanger 8 . The first temperature sensor 12 detects the temperature of the heating medium used for heating that returns from the heating terminal of the heating circulation circuit 4 to the heat exchanger 8 . A second temperature sensor 13 detects the temperature of the heating medium flowing into the heat exchanger 8 . A third temperature sensor 14 detects the temperature of the heating medium heated by the heat exchanger 8 . Based on the temperatures detected by these sensors, the combustion fan 7a, the built-in pump 10, the external pump 5, etc. are controlled by the control unit 16 so that the temperature of the heated heating medium reaches the target temperature (for example, 70° C.). controlled.

A first distribution valve 15 (distribution means) is provided at a branching portion of the circulation passage 9 and the first bypass passage 11 . The first distribution valve 15 can adjust the distribution ratio so as to be compatible with heating operation, hot water supply operation, and simultaneous heating and hot water supply operation. The controller 16 adjusts the distribution ratio of the first distribution valve 15 in order to distribute the heating medium heated by the heat exchanger 8 to the circulation passage 9 and the first bypass passage 11 .

The distribution ratio of the first distribution valve 15 is adjusted so that the heating heat medium is supplied only to the circulation passage 9 during heating operation, and adjusted so that the heating heat medium is supplied only to the first bypass passage 11 during hot water supply operation. be done. During simultaneous heating and hot water supply operation, the distribution ratio of the first distribution valve 15 is adjusted so that hot water supply is prioritized, and the heating medium is distributed to the circulation passage 9 and the first bypass passage 11 . The heating medium distributed to the circulation passage 9 is supplied to the heating circulation circuit 4 as indicated by arrows HS. The heating heat medium distributed to the first bypass passage 11 joins the heating heat medium in the circulation passage 9 at the junction C1. Between the built-in pump 10 and the first temperature sensor 12, a replenishment passage 18 for replenishing the heating medium is connected as indicated by an arrow AF.

Next, the hot water supply heat exchanger 20 will be described.
The hot water supply heat exchanger 20 exchanges heat between the heating heat medium in the first bypass passage 11 and clean water supplied from the water supply passage 19 , and supplies heated hot water to the hot water supply passage 21 . The water supply passage 19 includes a second distribution valve 23 , a flow control valve 24 , a flow sensor 25 and an incoming water temperature sensor 26 .

A second bypass passage 22 is branched from the water supply passage 19, and a second distribution valve 23 capable of adjusting the distribution ratio is disposed at this branch. The second distribution valve 23 distributes clean water to the hot water supply heat exchanger 20 to which the water supply passage 19 is connected and the second bypass passage 22 . The flow rate adjustment valve 24 adjusts the flow rate of clean water entering the second distribution valve 23 . The flow rate sensor 25 detects the flow rate of clean water entering the second distribution valve 23 . The incoming water temperature sensor 26 detects the temperature of clean water entering the second distribution valve 23 .

The second bypass passage 22 is connected to the hot water supply passage 21 at the junction C2. An outlet hot water temperature sensor 27 is provided between the confluence portion C2 of the hot water supply passage 21 and the hot water supply heat exchanger 20 . Discharged hot water temperature sensor 27 detects the temperature of hot water discharged from hot water supply heat exchanger 20 .

A hot water supply temperature sensor 28 is provided downstream of the junction C2 of the hot water supply passage 21 . The hot water supply temperature sensor 28 detects the temperature of the hot water supply in which the hot water heated by the hot water supply heat exchanger 20 and the clean water flowing through the second bypass passage 22 are mixed. During the hot water supply operation, the control unit 16 adjusts the distribution ratio of the second distribution valve 23 so that the hot water supply temperature reaches the set hot water supply temperature.

Next, the control unit 16 will be described with reference to FIGS. 1 and 2. FIG.
The control unit 16 is connected to an operation terminal 17 for setting a heating set temperature, a hot water supply set temperature, a target heat medium temperature, etc., and for performing operations such as starting/stopping the heating operation. The operation terminal 17 includes a display section 17a capable of displaying information such as various temperatures and operating conditions, and a switch section 17b for performing setting operations and the like. The control unit 16 is also communicably connected to the warm air heater 3, the external pump 5, and the outside air temperature sensor 30 installed outdoors, and acquires their operation information and the like.

The control unit 16 controls the combustion fan 7a, the built-in pump 10, the external pump 5, the first distribution valve 15, and the second distribution valve based on detection signals from various sensors such as the first temperature sensor 12 connected for communication. 23, etc., each of the heating operation, the hot water supply operation, and the simultaneous heating and hot water supply operation is controlled. The target heat medium temperature may be set by the control unit 16 according to the heating set temperature, and the heating set temperature is set by the control unit 16 receiving the temperature set by the warm air heater 3. good too.

Next, the hot water supply operation will be described.
When hot water supply is started by opening a hot water tap or the like during standby and the flow rate sensor 25 detects a flow rate equal to or higher than a predetermined value for starting the hot water supply operation, the control unit 16 starts combustion in the combustion unit 7 to operate the built-in pump 10. The first distribution valve 15 is adjusted so as to drive and supply the heating medium only to the first bypass passage 11 . The heating heat medium heated to the target heat medium temperature in the heat exchanger 8 by the combustion heat of the combustion unit 7 heats the clean water supplied from the water supply passage 19 in the hot water supply heat exchanger 20, and the heated hot water is It flows through the hot water supply passage 21 . Based on the temperature of hot water detected by outlet hot water temperature sensor 27 and the temperature of clean water detected by inlet water temperature sensor 26, control unit 16 is controlled so that the temperature detected by hot water supply temperature sensor 28 becomes the set hot water supply temperature. The distribution ratio of the two-distribution valve 23 is adjusted to control the mixing ratio of hot water in the confluence portion C2. When the hot water tap or the like is closed and the flow rate sensor 25 no longer detects a flow rate equal to or greater than a predetermined value, the control unit 16 ends the hot water supply operation and waits.

Next, the heating operation will be explained.
When the heating operation is started by operating the warm air heater 3 or the operation terminal 17 during standby, the control unit 16 starts combustion in the combustion unit 7, drives the external pump 5 and the internal pump 10, and operates the heating circulation circuit. 4, the first distribution valve 15 is adjusted so that the heating heat medium is supplied only to the circulation passage 9. The heating heat medium heated to the target heat medium temperature in the heat exchanger 8 by the combustion heat of the combustion unit 7 is supplied to the warm air heater 3 to warm the air, and then part of it is heat exchanged in the heating and hot water supply device 2. It returns to vessel 8 and is reheated. When the heating operation is stopped by operating the operation terminal 17 or the like, the control section 16 stops combustion in the combustion section 7 and waits.

Next, the transition from the heating operation to the simultaneous heating and hot water supply operation will be described.
During the heating operation, unless it is immediately after the heating operation starts, the room temperature is basically stabilized around the heating set temperature, and the temperature drop of the heating medium due to heating is unlikely to increase. There is When the hot water supply valve or the like is opened during the heating operation and hot water supply is started and the flow rate sensor 25 detects a flow rate equal to or higher than a predetermined value, the control unit 16 adjusts the distribution ratio of the first distribution valve 15 to control the first bypass passage 11. The heating medium is also supplied to the heating and hot water simultaneous operation.

At this time, the flow rate of the heating medium supplied from the circulation passage 9 to the heating circulation circuit 4 decreases, and the amount of heat supplied to the warm air heater 3 decreases. Therefore, the warm air heater 3 cannot warm the air in the same way as during the heating operation, and the temperature of the warm air drops. The hot air sent out from the hot air heater 3 directly hits the human body, and the drop in the temperature of the hot air is likely to be sensed, which may make the person feel cold and uncomfortable.

Therefore, when a predetermined increase condition is satisfied, the target heat medium temperature is temporarily increased to compensate for the decrease in the amount of heat supplied. FIG. 3 is a flowchart of this target heat medium temperature increase control, and Si (i=1, 2, . . . ) in the figure represents steps. In S1 to S3, the rising conditions are determined.

In S1, it is determined whether or not there is a shift from the heating operation to the simultaneous heating and hot water supply operation. If the determination is Yes, the process proceeds to S2, and if the determination is No, the process returns without increasing the target heat medium temperature. Next, in S2, it is determined whether the heating terminal is the warm air heater 3 or not. If the determination is Yes, the process proceeds to S3, and if the determination is No, the process returns without increasing the target heat medium temperature.

Next, in S3, it is determined whether or not the temperature of the heating medium returning to the heat exchanger 8 of the heating and hot water supply device 2 has decreased by a predetermined value or more due to the shift from the heating operation to the simultaneous heating and hot water supply operation. . For example, it is determined whether or not the temperature of the heating medium detected by the first temperature sensor 12 has decreased by a predetermined value or more (for example, 10° C. or more) before and after the transition to the simultaneous heating and hot water supply operation. . It takes time according to the length of the heating circulation circuit 4 or the like until the heating medium supplied from the heating and hot water supply device 2 and used for heating after shifting to the heating and hot water supply simultaneous operation returns to the heating and hot water supply device 2. - 特許庁Therefore, the determination in S4 is made after one minute, for example, as a predetermined time after the shift to the heating and hot water supply simultaneous operation. This predetermined time is set according to the hot water heating system 1 at the time of construction. If the determination is Yes, the process proceeds to S4, and if the determination is No, the process returns without increasing the target heat medium temperature. If the supply of hot water ends before the determination, the control for increasing the target heat medium temperature ends.

Next, in S4, the target heat medium temperature is increased and the process returns. The increase value of the target heat medium temperature at this time is a predetermined temperature such as 20°C. In addition, in order to compensate for the decrease in the amount of heat supplied to the warm air heater 3 while suppressing excessive combustion, for example, an increase value may be calculated so that the temperature detected by the first temperature sensor 12 returns to the temperature during heating operation. good. Note that the target heat medium temperature is limited to an upper limit value or less so as not to exceed a preset upper limit value (for example, 95° C.) for safety.

When the target heat medium temperature is increased, the control unit 16 increases the amount of combustion heat in the combustion unit 7 to bring the temperature of the heating heat medium after heating closer to the increased target heat medium temperature. By increasing the target heat medium temperature, the decrease in the amount of heat supplied to the warm air heater 3 during the simultaneous heating and hot water supply operation is compensated for, and the decrease in the temperature of the warm air from the warm air heater 3 is suppressed.

FIG. 4 shows an example of actual measurement of changes in the warm air temperature of the warm air heater 3 by controlling the target heat medium temperature to rise. Before time t1, the heating operation is performed with the target heat medium temperature of 70°C, and the warm air temperature is stable at about 55°C. When the simultaneous heating and hot water supply operation is started at time t1, the amount of heat supplied from the heating and hot water supply device 2 fluctuates until the temperature of the hot water supply is stabilized with priority given to hot water supply, so the hot air temperature fluctuates greatly, and from around time t2, the heating operation starts. The warm air temperature stabilizes at a temperature lower than At time t3 after a predetermined time has passed since time t1, the first temperature sensor 12 detects that the temperature of the heating medium has decreased by a predetermined value or more, and the target temperature of the heating medium is increased by the calculated temperature (for example, 22°C). Let The heated heating medium begins to reach the warm air heater 3 at time t4, and the temperature of the warm air rises.

The target heat medium temperature may be increased by a predetermined increase value when the increase condition of S3 is omitted and the increase conditions of S1 and S2 are satisfied. The amount of heat supplied to the warm air heater 3 can be increased at the time of shifting from the heating operation to the simultaneous heating and hot water supply operation, and the decrease in the temperature of the warm air of the warm air heater 3 can be suppressed. Since the amount of heat supplied to the warm air heater 3 is increased before the first temperature sensor 12 detects a decrease in the temperature detected, the temperature decrease of the warm air from the warm air heater 3 can be suppressed early.

Also, the condition for increasing the temperature of S3 is changed so that the temperature detected by the first temperature sensor 12 is equal to or lower than a predetermined temperature, and the control for increasing the target heat medium temperature is repeatedly performed during simultaneous heating and hot water supply operation. You can also For example, when it is not necessary to raise the target heat medium temperature at the beginning of the transition to the simultaneous heating and hot water supply operation, but the hot air temperature of the warm air heater 3 decreases due to an increase in the hot water supply flow rate during the simultaneous heating and hot water supply operation. In addition, the amount of heat supplied can be increased. It should be noted that the order of determination of the rising conditions in S1 to S3 can be changed.

When the hot water tap or the like is closed and the flow rate sensor 25 no longer detects a flow rate equal to or greater than a predetermined value, the control unit 16 adjusts the first distribution valve 15 so that the heating medium is supplied only to the circulation passage 9, thereby supplying hot water for heating. Shift from simultaneous operation to heating operation. At this time, the target heat medium temperature is returned to the original set value.

The operation and effects of the heating and hot water supply apparatus 2 of the present invention will be described.
Since the heating and hot water supply device 2 raises the target heat medium temperature when the heating terminal is the warm air heater 3 when shifting from the heating operation to the simultaneous heating and hot water supply operation, the heating heat medium heated by the heat exchanger 8 temperature becomes higher than during heating operation. Therefore, even if the heating heat medium is distributed for the hot water supply operation and the flow rate of the heating heat medium supplied to the warm air heater 3 decreases, the amount of heat supplied to the warm air heater 3 is compensated. A decrease in the temperature of the warm air blown by the air heater 3 can be suppressed.

Further, when the heating operation is shifted to the simultaneous heating and hot water supply operation, the temperature of the heating medium used and returned to the heat exchanger 8 is lower than that during the heating operation by a predetermined value or more. In this case, the target heat medium temperature is raised to make the heating heat medium higher than during the heating operation. When there is a risk that the temperature of the warm air from the warm air heater 3 will drop significantly, the amount of heat supplied to the warm air heater 3 can be increased by increasing the temperature of the heating medium. It is possible to suppress the temperature drop of the wind.

Moreover, the temperature of the heating heat medium used for heating and returning to the heat exchanger 8 before joining the heating heat medium used for hot water supply is detected, and the temperature drop of the hot air of the warm air heater 3 is detected. It is possible to grasp the temperature required to suppress it. Therefore, when raising the target heat medium temperature, it is possible to set an appropriate target heat medium temperature and suppress a decrease in the temperature of the warm air from the warm air heater 3 .

When the heating operation is started during the hot water supply operation, the heating operation may not be started until the hot water supply is finished because the hot water supply is given priority, or the operation may be shifted to the simultaneous heating and hot water supply operation. When shifting to simultaneous heating and hot water supply operation, the target heat medium temperature may be temporarily increased in the same manner as described above. In addition, those skilled in the art can implement various modifications to the above-described embodiments without departing from the scope of the present invention, and the present invention includes such modifications.

1: Hot water heating system 2: Heating water heater 3: Warm air heater (heating terminal)
4: heating circulation circuit 5: external pump 7: combustion section (combustion means)
8: heat exchanger 9: circulation passage 10: built-in pump (circulation means)
11: First bypass passage (bypass passage)
12: first temperature sensor (temperature detection means)
15: First distribution valve (distribution means)
16: control unit (control means)
19: water supply passage 20: hot water supply heat exchanger 21: hot water supply passage C1: confluence

Claims (3)

Combustion means, a heat exchanger for heating a heating medium to a target heat medium temperature by heat generated by the combustion means, a circulation passage for connecting the heat exchanger to an external heating terminal, and the heating A circulation means provided in the circulation passage for circulating the heat medium, a bypass passage branching from the circulation passage and bypassing the heating terminal, and distributing the heating heat medium to the circulation passage and the bypass passage. a hot water supply heat exchanger provided in the bypass passage; a water supply passage for supplying tap water to the hot water supply heat exchanger; and hot water heated by the hot water supply heat exchanger. A heating and hot water supply apparatus comprising a hot water supply passage for supplying hot water at a predetermined hot water supply set temperature,
The distribution means is capable of adjusting a distribution ratio so as to be compatible with heating operation, hot water supply operation, and simultaneous heating and hot water supply operation,
When the heating terminal is a warm air heater at the time of transition from the heating operation to the simultaneous heating and hot water supply operation, the target heat medium temperature is increased , and if the heating terminal is not a warm air heater, A heating and hot water supply apparatus characterized in that the target heat medium temperature is not changed . A temperature detection means is provided for detecting the temperature of the heating medium returning from the heating terminal to the heat exchanger, and the temperature detected by the temperature detection means is determined in advance by transition from the heating operation to the simultaneous heating and hot water supply operation. 2. The heating and hot water supply system according to claim 1, wherein said target heating medium temperature is increased when said temperature has decreased by a predetermined value or more. 3. The heating and hot water supply apparatus according to claim 2, wherein said temperature detection means is disposed closer to said heating terminal than said junction of said circulation passage and said bypass passage.

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