JP2004028456A - Hot-water space heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot-water space heating system with suppressed cost capable of controlling room temperature near a target temperature according to hot water supply at each temperature when hot water is applied as a heat source at two-kinds of temperatures responsive to an application. <P>SOLUTION: A floor heating controller 52 previously stores, in a memory, a matching map of a temperature difference between a detected room temperature set assuming the hot water supply at 60°C and a target floor heating temperature with an ON/OFF pattern in a predetermined control cycle of a thermomotive valve 15. When hot water at 80°C is supplied to a floor heater 3 via a hot water circulation passage 4, a heat source machine controller 26 performs a correction of reducing a rate of ON time in the ON/OFF pattern of the thermomotive valve 15 determined by the matching map of the temperature difference / hot water supply amount received from the floor heating controller 52, thereby reducing heat release from the floor heater 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a hot water heating system that heats a room by supplying hot water from a heat source device to a heating terminal via a hot water circulation path.
[0002]
[Prior art]
For example, a hot air heater or a floor heater is known as a hot water heating terminal that performs heating using hot water supplied from a heat source device to a hot water circulation path as a heat source. There is also known a heating system in which the temperature of hot water discharged from the heat source device to the hot water circulation path is changed depending on the type of a heating terminal connected to the hot water circulation path.
[0003]
For example, in a heating system in which a hot-air heater and a floor heater are connected to a hot-water circulation path, when the hot-air heater is operated alone, the temperature of hot water from the heat source unit to the hot-water circulation path is high (for example, 80 ° C), and when the floor heater is operated alone, the temperature of hot water from the heat source device to the hot water circulation path is low (eg, 60 ° C).
[0004]
In this case, the floor heater is provided with a room temperature sensor for detecting the room temperature, and the amount of hot water supplied from the hot water circulation path to the floor heater in accordance with the temperature difference between the target heating temperature and the temperature detected by the room temperature sensor. Has been controlled so that the room temperature is kept close to the target temperature by changing the ratio of the opening time and the closing time in a predetermined control cycle of the on-off valve provided in the heat source device.
[0005]
Then, in order to perform such control, the floor heating device determines the supply amount of hot water from the hot water circulation path to the floor heating device according to the temperature difference obtained by subtracting the target heating temperature from the detection temperature of the room temperature sensor. A memory for storing a temperature difference / hot water supply amount correspondence map is provided, and the control value of the hot water supply amount is determined by applying the temperature difference to the correlation map.
[0006]
Here, when both the hot air heater and the floor heater are operated, the temperature of the hot water supplied from the heat source device to the hot water circulation path is raised to a high temperature (80 ° C.) in order to secure the heating capacity of the hot air heater. ) Needs to be controlled.
[0007]
However, when the temperature of the hot water supplied from the heat source unit to the hot water circulation path is set to a high temperature (80 ° C.), the floor heating is performed according to the temperature difference / hot water supply amount correspondence map assuming a low temperature (60 ° C.). If the amount of hot water supplied to the machine is determined, the amount of heat radiated from the floor heater increases and the room temperature rises too much.
[0008]
Therefore, in the conventional heating system, the corresponding map of the temperature difference / hot water supply amount is previously stored in two types of memories, one for setting a low temperature (60 ° C.) and the other for setting a high temperature (80 ° C.). However, in this case, the required memory capacity increases and the cost of the floor heater increases.
[0009]
[Problems to be solved by the invention]
The present invention solves the above disadvantages, and when hot water at two different temperatures is supplied from a heat source device to a heating terminal, hot water that can maintain a room temperature near a target room temperature in accordance with hot water supply at each temperature. An object of the present invention is to provide a heating system at a reduced cost.
[0010]
[Means for Solving the Problems]
The present invention has been made to achieve the above object, and performs heating using a heat source device that circulates hot water of a predetermined temperature through a hot water circulation path and hot water supplied through the hot water circulation path as a heat source. A high-temperature heating terminal and a low-temperature heating terminal, a flow rate adjusting means for adjusting a flow rate of hot water supplied from the hot-water circulation path to the low-temperature heating terminal, and when operating the high-temperature heating terminal alone and the high-temperature heating terminal, When operating both of the low-temperature heating terminal, the predetermined temperature is a high-temperature set temperature, and when operating the low-temperature heating terminal alone, the predetermined-temperature is a low-temperature set temperature lower than the high-temperature set temperature. A room temperature sensor that detects the temperature of the room in which the low-temperature heating terminal is provided, and a temperature between a predetermined target room temperature and the temperature detected by the room temperature sensor, assuming hot water supply at the low-temperature set temperature. The correspondence between the hot water supply amount, which is the amount of hot water per predetermined time supplied from the hot water circulation path to the low-temperature heating terminal, is detected by the room temperature sensor with respect to the target room temperature, which is grasped from the temperature difference. A memory in which data of a temperature difference / hot water supply map is set in advance so that the hot water supply amount increases as the degree of temperature shortage increases, and the low temperature heating is performed by setting the predetermined temperature to the low temperature setting temperature. When the terminal is operated alone, the flow rate adjusting means controls the supply of hot water so as to secure a hot water supply amount obtained by applying the temperature difference to the temperature difference / hot water supply amount correspondence map. The present invention relates to an improvement of a hot water heating system including a hot water supply amount control means for controlling an amount.
[0011]
When the predetermined temperature is set to the high-temperature set temperature and both the high-temperature heating terminal and the low-temperature heating terminal are in operation, the hot-water supply amount control means calculates the temperature difference as the difference between the temperature difference and the hot water. A correction is made to reduce the hot water supply amount obtained by applying the supply amount correspondence map to the target room temperature while maintaining the relation that the hot water supply amount increases as the degree of shortage of the detection temperature of the room temperature sensor with respect to the target room temperature increases. The flow rate adjusting means controls the hot water supply amount such that the corrected hot water supply amount is secured.
[0012]
According to the present invention, when the predetermined temperature is set to the high-temperature set temperature, the hot-water supply amount control unit sets the temperature difference to the temperature difference / hot-water supply created based on the low-temperature set temperature. A correction is made to reduce the hot water supply obtained by applying to the quantity correspondence map to reduce the hot water supply from the hot water circulation path to the low-temperature heating terminal. Therefore, it is not necessary to previously store the temperature difference / hot water supply amount correspondence map assuming the high temperature set temperature in the memory, and the cost of the hot water heating system does not increase due to an increase in the memory capacity.
[0013]
Then, the correction for reducing the supply amount of hot water from the hot water circulation path to the low-temperature heating terminal maintains the relationship that the supply amount of hot water increases as the degree of lack of the detection temperature of the room temperature sensor with respect to the target room temperature increases. Done in Therefore, it is possible to suppress an increase in the amount of heat released from the low-temperature heating terminal to the room, and to keep the room temperature near the target room temperature.
[0014]
The temperature difference / hot water supply amount correspondence map is set such that the larger the degree of excess of the detection temperature of the room temperature sensor with respect to the target room temperature, which is grasped from the temperature difference, the smaller the hot water supply amount. The hot water supply amount control means, when the predetermined temperature is the high temperature set temperature and both the high-temperature heating terminal and the low-temperature heating terminal are in operation, calculates the temperature difference as the difference between the temperature difference / the hot water supply amount. A correction is made to reduce the amount of hot water supply obtained by applying to the correspondence map, while maintaining a relationship in which the larger the degree of excess of the detected temperature of the room temperature sensor with respect to the target room temperature is, the smaller the amount of hot water supply is, and The hot water supply amount is controlled by the flow rate adjusting means so that a later hot water supply amount is secured.
[0015]
According to the present invention, when the hot water at the high-temperature set temperature is supplied from the hot-water circulation path to the low-temperature heating terminal, the correction for decreasing the hot-water supply amount by the hot-water supply amount control means corrects the target room temperature. This is performed while maintaining the relationship that the larger the degree of excess of the detection temperature of the room temperature sensor with respect to the temperature, the smaller the amount of hot water supply. Therefore, the amount of heat released from the low-temperature heating terminal to the room required to maintain the room temperature at the target room temperature can be appropriately set, and the room temperature can be prevented from becoming too high.
[0016]
Further, the flow rate adjusting means is an on-off valve for switching between supply and cutoff of hot water from the hot water circulation path to the low-temperature heating terminal, and the hot water supply amount control means uses the predetermined time as a control cycle, The hot water supply amount is controlled by changing the ratio between the opening time and the closing time of the on-off valve in a cycle.
[0017]
According to the present invention, the amount of hot water supplied from the hot water circulation path to the low-temperature heating terminal can be controlled by simple control using the relatively inexpensive on-off valve.
[0018]
Further, the temperature difference / hot water supply amount correspondence map defines the hot water supply amount as a ratio of an opening time and a closing time of the on-off valve in the control cycle. The correction is performed by reducing the ratio of the opening time of the on-off valve in the control cycle, which is obtained by applying the temperature difference / hot water supply amount to the corresponding map.
[0019]
According to the present invention, the hot water supply amount control means reduces the ratio of the open time of the on-off valve in the control cycle obtained from the temperature difference / hot water supply amount correspondence map, thereby providing the hot water circulation. Correction for reducing the amount of hot water supplied from the road to the low-temperature heating terminal can be easily performed.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
An example of an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram of a hot water heating system of the present invention. FIG. 2 is a diagram for determining a hot water supply amount from a hot water circulation path to a floor heater in accordance with a temperature difference obtained by subtracting a target floor heating temperature from a detected room temperature. FIG. 3 is a diagram showing a correspondence map of the temperature difference / hot water supply amount, and FIG. 3 is an explanatory diagram of a method of correcting the ON / OFF pattern of the thermal valve determined by the correspondence map shown in FIG.
[0021]
Referring to FIG. 1, a hot water heating system according to the present embodiment includes a heat source device 1 installed outdoors, a hot air heater 2 installed indoors (corresponding to a high temperature heating terminal of the present invention), and a floor. The heat source unit 1 is connected to the warm air heater 2 and the floor heater 3 by a hot water circulation path 4. The hot water circulation path 4 branches into a hot air heating path 5 that supplies hot water to the hot air heater 2 and a floor heating path 6 that supplies hot water to the floor heater 3.
[0022]
The heat source device 1 includes a hot water heat exchanger 8 that is heated by the burner 7 to heat the hot water in the hot water circulation path 4, a hot water thermistor 9 that detects the temperature of the hot water supplied from the hot water heat exchanger 8, A circulation pump 10 for circulating hot water in the hot water circuit 4, a cistern 11 for absorbing expansion and contraction of the hot water in the hot water circuit 4, and a hot water supplied from the hot water heat exchanger 8 bypassed to the inlet of the cistern 11. A bypass path 12 is provided.
[0023]
Further, the heat source unit 1 includes a thermal valve 15 (corresponding to a flow rate adjusting means of the present invention) for opening and closing the floor heating path 6, a gas supply pipe 20 for supplying fuel gas to the burner 7, and a gas supply pipe 20. , A gas proportional valve 23 for adjusting the supply flow rate of fuel gas to the burner 7, a combustion fan 24 for supplying combustion air to the burner 7, a power switch, A switch unit 25 having a buzzer and the like, and a heat source device controller 26 (including the function of the hot water supply amount control means of the present invention) are provided.
[0024]
The heat source device controller 26 is an electronic unit including a microcomputer, a memory, and the like. The heat source device controller 26 is connected to the warm air heater 2 by a communication cable 27, and is connected to a floor heating remote controller 28 and a communication cable 29 installed near the floor heater 3. It is connected.
[0025]
The hot air heater 2 includes a hot air heat exchanger 40 connected to the hot air heating path 5, a flow control valve 41 for adjusting the flow rate of hot water supplied from the hot air heating path 5 to the hot air heat exchanger 40, A hot air fan 42 for sending out the air heated by the hot air heat exchanger 40 as hot air, a hot air heating operation panel 43 having a switch for instructing start / stop of heating, and a hot air heating thermistor 44 for detecting room temperature. , And a hot air heating controller 45 that controls the overall operation of the hot air heater 2.
[0026]
The floor heating remote controller 28 includes a floor heating operation panel 50 having a switch for instructing start / stop of floor heating, a floor heating thermistor 51 for detecting room temperature (corresponding to a room temperature sensor of the present invention), and the floor heater 3. Is provided with a floor heating controller 52 for setting the supply amount of hot water.
[0027]
Then, when receiving a signal instructing the start of the heating operation from the hot air heating controller 45 or the floor heating controller 52, the heat source device controller 26 performs the ignition process of the burner 7, activates the circulation pump 10, and circulates the hot water. The supply of hot water to the road 4 is started.
[0028]
The operation of the hot water heating system when the hot air heater 2 is operated alone, when the floor heater 3 is operated independently, and when the hot air heater 2 and the floor heater 3 are simultaneously operated will be described.
[0029]
First, when the hot air heater 2 is operated alone, the heat source device controller 26 controls the combustion of the burner 7 so that the hot water of 80 ° C. (corresponding to the high temperature set temperature of the present invention) is supplied to the hot water circulation path 4. Control the amount. That is, the heat source device controller 26 controls the supply flow rate of the fuel gas to the burner 7 by the gas proportional valve 23 so that the detected temperature of the hot water thermistor 9 becomes 80 ° C., and burns the burner 7 by the combustion fan 24. Controls the supply flow rate of the working air.
[0030]
Then, the hot air heating controller 45 controls the hot air heat exchanger 40 by the flow rate control valve 41 so that the detected temperature of the hot air heating thermistor 44 matches the target hot air heating temperature set by the hot air heating operation panel 43. The warm air is supplied into the room by the warm air fan 42 by controlling the flow rate of the warm water supplied to the room.
[0031]
Next, during the sole operation of the floor heater 3, the heat source device controller 26 controls the combustion of the burner 7 so that the hot water of 60 ° C. (corresponding to the low temperature set temperature of the present invention) is supplied to the hot water circulation path 4. Control the amount. That is, the heat source controller 26 controls the supply flow rate of the fuel gas to the burner 7 by the gas proportional valve 23 so that the detected temperature of the hot water thermistor 9 becomes 60 ° C., and burns the burner 7 by the combustion fan 24. Controls the supply flow rate of the working air.
[0032]
Then, the floor heating controller 52 controls the thermal valve 15 so that the detected temperature of the floor heating thermistor 51 matches the target floor heating temperature (corresponding to the target room temperature of the present invention) set by the floor heating operation panel 50. A signal instructing an ON / OFF (open / close) pattern is transmitted to the heat source controller 26.
[0033]
Here, the floor heating controller 52 stores in advance a data of a temperature difference / hot water supply amount correspondence map shown in (1) of FIG. 2 in a memory (not shown). Then, the floor heating controller 52 applies the temperature difference (ΔT = Ts−Ta) obtained by subtracting the target floor heating temperature (Ta) from the detected temperature (Ts) of the floor heating thermistor 51 to the temperature difference / hot water supply map. A signal instructing the ON / OFF pattern of the thermal valve 15 in the control cycle of 20 minutes obtained as described above is transmitted to the heat source device controller 26.
[0034]
The heat source device controller 26 sets the ON time of the thermal valve 15 in the control cycle of 20 minutes according to the ON / OFF pattern of the thermal valve 15 received from the floor heating controller 52, and thereby, the floor heating path 6 The hot water supply amount to the heater 3 per 20 minutes (corresponding to the predetermined time of the present invention) is controlled.
[0035]
In this case, according to the temperature difference / hot water supply amount correspondence map shown in (1) of FIG. 2, ON / OFF of the heat operated valve 15 is set such that the smaller the value of the temperature difference (ΔT), the larger the hot water supply amount. Is controlled. That is, when the detected temperature (Ts) of the floor heating thermistor 51 is lower than the target floor heating temperature (Ta) (ΔT <0), the detected temperature (Ts) of the floor heating thermistor 51 with respect to the target floor heating temperature (Ta). The ON / OFF of the thermal valve 15 is controlled such that the larger the degree of shortage of ()), the greater the amount of hot water supply.
[0036]
On the other hand, when the detected temperature (Ts) of the floor heating thermistor 51 is higher than the target floor heating temperature (Ta) (ΔT> 0), the detected temperature of the floor heating thermistor 51 with respect to the target floor heating temperature (Ta) ( ON / OFF of the thermal valve 15 is controlled such that the larger the excess degree of Ts) is, the smaller the supply amount of hot water is.
[0037]
Next, during the simultaneous operation of the hot air heater 2 and the floor heater 3, the heat source controller 26 controls the combustion amount of the burner 7 so that the hot water of 80 ° C. is supplied to the hot water circulation path 4. The heating capacity of the warm air heater 2 is preferentially secured.
[0038]
In this case, since the hot water of 80 ° C. is also supplied to the floor heater 3, the amount of heat released from the floor heater 3 when the thermal valve 15 is operated in the same ON / OFF pattern is 60 °. It increases more than when hot water of ° C is supplied. Therefore, if the ON / OFF pattern of the heat valve 15 according to the temperature difference (ΔT) is determined by the temperature difference / hot water supply amount correspondence map shown in (1) of FIG. 2, the target floor heating temperature (Ta) On the other hand, the room temperature becomes excessively high.
[0039]
Therefore, when supplying the hot water of 80 ° C. from the hot water circulation path 4 to the floor heater 3 as shown in FIG. 3, the heat source controller 26 receives the heat valve received from the floor heating controller 52 in FIG. (15) ON / OFF pattern (floor heater request ON / OFF pattern) and (b) ON / OFF pattern with reduced ON time (heat source device restriction ON / OFF pattern) are generated by synthesis. The ON / OFF of the thermal valve 15 is controlled by the ON / OFF pattern (c) after the synthesis (c).
[0040]
In this case, the ON time of the ON / OFF pattern of (c) is different from the ON / OFF pattern of (a) (the ON / OFF pattern of the thermal valve 15 assuming that hot water of 60 ° C. is supplied). Since the time is reduced by 1.5 minutes, an increase in the amount of heat radiation from the floor heater 3 due to the supply of the hot water of 80 ° C. is suppressed, and the room temperature becomes excessively high with respect to the target floor heating temperature (Ta). Can be prevented.
[0041]
Then, the ON / OFF pattern obtained by synthesizing the ON / OFF pattern from the floor heating controller 52 shown in (1) of FIG. 2 and the restricted ON / OFF pattern of the heat source device shown in (2) of FIG. As shown in (3) in FIG. 2, the pattern reduces the amount of heat radiation in the floor heater 3 while maintaining the relationship that the smaller the temperature difference (ΔT), the larger the amount of hot water supplied to the floor heater 3 is maintained. It will be made.
[0042]
Therefore, even when hot water of 80 ° C. is supplied to the floor heater 3, the amount of hot water supplied from the floor heating path 6 to the floor heater 3 is increased or decreased according to the temperature difference (ΔT), and the room temperature is targeted. The temperature can be kept near the floor heating temperature (Ta), and the room can be heated safely by preventing the floor temperature from rising excessively.
[0043]
As described above, in the present embodiment, when 80 ° C. hot water is supplied to the floor heater 3, the amount of hot water supplied to the floor heater 3 is reduced by the processing on the heat source device controller 26 side. ing. Therefore, the memory map of the floor heating controller 52 stores the temperature difference / hot water supply amount correspondence map corresponding to the 80 ° C. hot water supply separately from the temperature difference / hot water supply amount correspondence map corresponding to the 60 ° C. hot water supply. There is no need to store in advance, and the cost of the floor heating controller 52 does not increase. Further, there is no need to change the specifications of the floor heating controller 52.
[0044]
Also, in the present embodiment, a so-called one-temperature type hot water heating system in which hot water of the same temperature is supplied to the hot air heater 2 and the floor heater 3 has been described. In a so-called two-temperature type hot water heating system in which hot water is supplied to the floor heater 3 and hot water at a low temperature (for example, 60 ° C.) is supplied, the floor heating controller 52 uses a temperature difference corresponding to the low-temperature hot water. / Only a map of hot water supply is provided.
[0045]
Therefore, as described above, by reducing the amount of hot water supplied to the floor heater 3 by the processing on the heat source device controller 26 side, the floor heating controller for the one-temperature type (the high-temperature controller The specifications of the two types of temperature difference / hot water supply amount maps for low and low temperature) and the floor heating controller for the two temperature type (only low temperature difference / hot water supply map) are common. Can be That is, regardless of whether the system is a one-temperature type hot water heating system or a two-temperature type hot water heating system, the floor heating controller need only have a low-temperature temperature difference / hot water supply amount correspondence map.
[0046]
In the present embodiment, the amount of hot water supplied to the floor heater 3 is controlled by changing the ratio between the ON time and the OFF time of the heat valve 15 in the control cycle. A flow control valve may be provided, and the opening of the floor heating path 6 may be adjusted by the flow control valve to control the amount of hot water supplied to the floor heater 3.
[0047]
In this case, when the hot water of 80 ° C. is supplied to the floor heater 3, the heat source device controller 26 performs a correction for decreasing the instruction value of the hot water supply amount corresponding to the 60 ° C. hot water supply received from the floor heating controller 52. Then, the opening degree of the flow control valve may be determined.
[0048]
Further, in this embodiment, the temperature difference / hot water supply correspondence map shown in (1) of FIG. 2 indicates that the larger the degree of shortage of the detected temperature (Ts) of the floor heating thermistor 51 with respect to the target temperature (Ta), The supply amount was set large, and the hot water supply amount was set smaller as the degree of excess of the detected temperature (Ts) of the floor heating thermistor 51 with respect to the target temperature (Ta) was larger.
[0049]
On the other hand, the correspondence map of the temperature difference / hot water supply amount is set such that the larger the degree of shortage of the detected temperature (Ts) of the floor heating thermistor 51 with respect to the target temperature (Ta), the larger the hot water supply amount and the target temperature (Ta). ), When the detected temperature (Ts) of the floor heating thermistor 51 becomes excessive, even if the hot water supply is fixed or the hot water supply is set to stop, When the temperature of the supplied hot water has reached 80 ° C., the hot water supply amount obtained from the temperature difference / hot water supply amount correspondence map is calculated based on the detected temperature (Ts) of the floor heating thermistor 51 with respect to the target temperature (Ta). The effect of the present invention can be obtained by performing correction to maintain and reduce the relationship that the hot water supply amount increases as the degree increases.
[0050]
Further, in this embodiment, the hot air heater 2 is shown as the high-temperature heating terminal of the present invention, and the floor heater 3 is shown as the low-temperature heating terminal of the present invention. The present invention can also be applied to a hot water heating system in which a plurality of sets of floor heaters having a rapid heating function are installed.
[0051]
In this case, when any of the floor heaters performs rapid heating, the temperature of the hot water supplied from the heat source device is switched from a normal low temperature setting (eg, 60 ° C.) to a high temperature setting (eg, 72 ° C.). During the execution of the rapid heating, a correction may be made to reduce the supply amount of the hot water to the floor heater that performs the normal heating without performing the rapid heating by the heat source device controller 26. In this case, the floor heater that performs rapid heating corresponds to the high-temperature heating terminal of the present invention, and the floor heater that performs normal heating corresponds to the low-temperature heating terminal of the present invention.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of a hot water heating system according to the present invention.
FIG. 2 is a diagram showing a correspondence map of temperature difference / hot water supply amount.
FIG. 3 is an explanatory diagram of a method of correcting an ON / OFF pattern of a thermal valve.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Heat source unit, 2 ... Hot air heater, 3 ... Floor heater, 4 ... Hot water circulation path, 5 ... Hot air heating path, 6 ... Floor heating path, 7 ... Burner, 8 ... Hot water heat exchanger, 9 ... Hot water thermistor, 10 circulating pump, 11 cistern, 12 bypass path, 15 thermal valve, 26 heat source controller, 45 hot air heating controller, 51 floor heating thermistor, 52 floor heating controller

Claims (4)

A heat source unit for circulating hot water of a predetermined temperature through the hot water circulation path, a high-temperature heating terminal and a low-temperature heating terminal for heating using hot water supplied through the hot water circulation path as a heat source, and The flow rate adjusting means for adjusting the flow rate of hot water supplied to the heating terminal, and when operating the high-temperature heating terminal alone and when operating both the high-temperature heating terminal and the low-temperature heating terminal, the predetermined temperature is set to a high temperature. And a hot water temperature setting means for setting the predetermined temperature to a low setting temperature lower than the high setting temperature when operating the low temperature heating terminal alone, and a room temperature for detecting a temperature of a room provided with the low temperature heating terminal. Sensors and
Assuming hot water supply at the low temperature set temperature, a temperature difference between a predetermined target room temperature and the detected temperature of the room temperature sensor, and hot water per predetermined time supplied to the low temperature heating terminal from the hot water circuit. The difference between the hot water supply amount and the hot water supply amount is set such that the larger the degree of shortage of the detection temperature of the room temperature sensor with respect to the target room temperature detected from the temperature difference, the larger the hot water supply amount. A memory in which data of the corresponding map of the supply amount is stored in advance,
When the predetermined temperature is the low-temperature set temperature and the low-temperature heating terminal is operating alone, the hot water supply amount obtained by applying the temperature difference to the temperature difference / hot water supply amount correspondence map is obtained. So as to be ensured, in a hot water heating system comprising a hot water supply amount control means for controlling the hot water supply amount by the flow rate adjustment means,
When the predetermined temperature is the high-temperature set temperature and both the high-temperature heating terminal and the low-temperature heating terminal are in operation, the hot-water supply amount control means calculates the temperature difference as the temperature difference / hot-water supply amount. Correction to reduce the hot water supply amount obtained by applying to the corresponding map, while maintaining the relationship that the hot water supply amount increases as the degree of shortage of the detection temperature of the room temperature sensor with respect to the target room temperature increases, A hot water heating system, wherein the hot water supply amount is controlled by the flow rate adjusting means so that the corrected hot water supply amount is secured. The temperature difference / hot water supply amount correspondence map is set such that the larger the excess degree of the detection temperature of the room temperature sensor with respect to the target room temperature grasped from the temperature difference, the smaller the hot water supply amount,
The hot water supply amount control means, when the predetermined temperature is set to the high temperature set temperature and both the high-temperature heating terminal and the low-temperature heating terminal are operating, calculates the temperature difference as the difference between the temperature difference and the hot water supply amount. Correction to reduce the hot water supply amount obtained by applying to the corresponding map, while maintaining the relationship that the hot water supply amount decreases as the degree of excess of the detection temperature of the room temperature sensor with respect to the target room temperature increases, 2. The hot water heating system according to claim 1, wherein the hot water supply amount is controlled by the flow rate adjusting means such that the corrected hot water supply amount is secured. The flow rate adjusting unit is an on-off valve that switches between supply and shutoff of hot water from the hot water circulation path to the low-temperature heating terminal,
The hot water supply amount control means controls the hot water supply amount by changing the ratio of the open time and the close time of the on-off valve in the control cycle to the predetermined time as a control cycle. The hot water heating system according to claim 1 or 2. The temperature difference / hot water supply amount correspondence map defines the hot water supply amount as a ratio between the open time and the close time of the on-off valve in the control cycle,
The hot water supply amount control means performs the correction by reducing the ratio of the open time of the on-off valve in the control cycle obtained by applying the temperature difference to the temperature difference / hot water supply amount correspondence map. The hot water heating system according to claim 3, wherein:

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