JPH0827000B2 - Hot water heating system - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a hot water heating device that uses hot water to heat or boil a bath.

2. Description of the Related Art A conventional hot water heating system is, for example, as shown in FIG. A circulation pump 3 for feeding hot water is provided between the heat exchanger 1 and the tank 2. The burner 4 for burning the gas is provided in the lower part of the heat exchanger 1. The heat exchanger 1 and the fan convector 5 are connected to the outgoing line 6
The tank 2 and the fan convector 5 are connected by a return pipe 7. Reference numeral 5a is a valve provided in the fan convector 5. In addition, outgoing line 6
A first sensor 8 for detecting the temperature of hot water is provided near the heat exchanger 1 in the middle of. The first sensor 8 may be provided in the middle of the hot water pipe of the heat exchanger 1. The fan convector 5 and the control device 9 are connected by a signal line 5b. A plurality of fan convectors 5 can be provided in parallel by branching the outward conduit 6 and the return conduit 7 into a plurality at the lower part of the device body. Although the load is a fan convector here, it may be a floor heater, a bath heater, or the like. In addition, the heat exchanger 1, the tank 2,
The circulation pump 3, the burner 4, the first sensor 8, the control device 9 and the like, the forward pipe line 6 and the return pipe line 7 constitute a heat source device 12.

In the above, hot water is warmed by burning the gas in the burner 4 and heating the heat exchanger 1. The warm water that has been warmed is sent by the circulation pump 3 and passes through the forward path 6,
Heat is dissipated in the fan convector 5 and returns to the tank 2 again via the return conduit 7. The fan convector 5 changes the heat of the supplied hot water into warm air by the fan. When the fan convector 5 is turned on, the valve 5a opens and the signal line 5b transmits a signal to activate the heat source device 12 as well. To do. The first sensor 8 detects the temperature of the hot water supplied, and the controller 9 controls the combustion of gas in the burner 4 to control the temperature of the hot water. When there are a plurality of loads such as the fan convector 5, the heated hot water passes through the branched outward conduit 6 to be supplied to the respective loads, and then returns to the heat source device 12 again.

One of the challenges of hot water heating systems is to reduce maintenance costs, but in order to do so, it is necessary to improve system efficiency. In other _{words, Qinput = Q e + Q B} + Q P Qinput: Gas input Q _e : Indoor heat dissipation Q _B : Exhaust heat from heat source Q _P : There is a relationship of heat dissipation loss from the carrier material, and to increase η (thermal efficiency), Q _B and Q _P
Needs to be small. Q _B and Q _P are both determined by the hot water temperature and the outside temperature, in order to improve efficiency, it is effective to control low temperature hot water without compromising the heating capacity at steady state. In a conventional hot water heating device, the hot water is controlled so that the temperature of the hot water is constant (about 80 ° C.) and is fed to the fan convector 5, or the room thermostat (built in the fan convector 5 The temperature of the hot water is changed by interlocking ON / OFF (not shown) and the heat source device 12. What is a room thermostat is to turn on or off the fan of the fan convector 5 when the temperature rises above or below a set temperature. To explain this system concretely, when heating starts or when the number of heating rooms increases, the load is large, so the hot water going temperature is set to the maximum temperature (80
). When the room warms up and the room thermostat starts turning on and off, the time is counted, and if the heating duration (signal from the room thermostat) is within 15 minutes, the temperature of the hot water drops from 80 ℃ to 70 ℃ to 65 ℃. Let it increase for 15 minutes or more. That is, when the forward temperature is 80 ° C, the forward temperature is lowered to 70 ° C when there is a signal from the room thermo within 15 minutes. At 70 ℃, if there is a signal within 15 minutes, it will be lowered to 65 ℃.
If it continues for 15 minutes or more, raise to 80 ℃. When the temperature is 65 ° C and there is a room thermo signal within 15 minutes, the temperature continues to be 60 ° C. As a result, the temperature of the hot water can be changed and set to a temperature according to the load on the room, the efficiency can be improved, and the maintenance cost can be reduced. In addition, the number of times the fan convector 5 is turned on and off is reduced, improving comfort.

Problems to be Solved by the Invention According to the above configuration, the fan convector 5 and the heat source device are provided.
12 need to be interlocked. In other words, the heat source device 12 is activated by the switch of the fan convector 5,
It is necessary to put the signal of the room thermostat of the fan convector 5 into the heat source device 12. Therefore, an angle tube with a signal line is used, and a fan convector with a room thermostat is required, which is troublesome and costly. Also, when the bath heater is used to boil the bath, the load decreases as the temperature rises in the bath, but since this decrease in load cannot be detected, this system is used to set the temperature of hot water according to the load. I can't.

The present invention solves the above-mentioned problems of the conventional technology.
The balance between the amount of heat consumed by the radiator and the heating amount of the burner is returned to the hot water, and the temperature difference is checked on the heating side by the return temperature difference.The hot water forward temperature is controlled according to the amount of heat consumed by the radiator to reduce the radiation loss in the hot water circulation path For the purpose of

Means for Solving the Problems In order to solve the above problems, the present invention provides a heat exchanger for heating hot water, a burner for heating the heat exchanger, and a circulation pump for feeding the hot water, A first sensor that is provided in the hot water outgoing line to detect the hot water outgoing temperature; a second sensor that is provided in the hot water return line to detect the hot water returning temperature; and the hot water outgoing line When the difference between the signals from the radiator that receives the heat of the hot water that passes through by connecting to the return pipe and radiates the heat, the first sensor, and the signal from the second sensor exceeds a predetermined value, the forward temperature of the hot water And a control device for controlling the heating amount of the burner so that the forward temperature of the hot water is lowered when the difference between the signals decreases.

With the above configuration, in the hot water heating device of the present invention, when the heat radiation amount of the radiator becomes larger than the heating amount of the burner, the return temperature of the hot water returning to the heat exchanger decreases, and the temperature difference from the outgoing temperature of the hot water has a predetermined value. Expand more. Based on this signal, the control device determines that the heat radiation amount of the radiator is larger than the heat radiation amount of the burner, and increases the heat amount of the burner and keeps it within a predetermined temperature difference. Further, when the heat radiation amount of the radiator becomes small and the heating amount of the burner becomes relatively large, the forward temperature of the hot water rises. This change results in the temperature difference as a signal difference between the first sensor and the second sensor, and the controller determines that the heating amount of the burner exceeds the required heat radiation amount of the radiator due to this temperature difference, and the heating amount of the burner is determined. To reduce the forward temperature of hot water. In this way, for example, even if control is started by maximizing the heating amount of the burner so that the maximum forward temperature is the first and making the forward temperature of the hot water the maximum temperature, the hot water corresponding to the heat radiation amount of the radiator is While controlling the forward temperature on the heating side (non-radiator) of the hot water, the amount of heat radiation loss in the hot water circulation path can be suppressed more than when the constant forward temperature of the hot water is always high.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.
The same parts as those of the above-mentioned conventional example are designated by the same reference numerals, detailed description thereof will be omitted, and different parts will be mainly described. In FIG. 1, a second sensor 10 for detecting the return temperature of hot water is provided in the return pipe 7. Further, a flow rate sensor 11 for detecting the flow rate of hot water is provided in the hot water pipeline in the heat source device. Here, it is attached in the middle of the return pipe 7 where the temperature of the hot water is low. 9'is a control device
The burner 4 is controlled so that the temperature control shown in FIGS. 2 and 3 is performed by calculating the difference between the signals from the sensor 8 and the second sensor 10. 13 is a bypass line.

The operation of the above configuration will be described below. When the heat source device 12 is switched on, the circulation pump 3 is activated, and hot water circulates through the tank 2, the heat exchanger 1, and the bypass line 13 in the heat source device 12. Further, when the fan convector 5 is turned on, the valve 5a is opened, and hot water is supplied to the fan con vector 5 from the heat source device 12.

Then, the flow rate sensor 11 detects the flow rate circulating in the hot water pipeline, and the control device 9'calculates the number of the fan convectors 5 used by this signal. When one fan convector 5 is used, it is about 2 l / min, although it depends on the lengths of the forward conduit 6 and the return conduit 7. FIG. 2 shows the control method. Each temperature is an average temperature. At the beginning of heating, the maximum load (about 80
The first sensor 8 detects the forward temperature so that the temperature becomes (° C.), and the controller 9 ′ controls combustion of the burner 4 by this signal to supply hot water. When the room temperature warms up, the return temperature of hot water rises and the difference between the return temperature and the return temperature becomes smaller. The second sensor 10 detects the return temperature of the hot water and detects the difference between the return temperature and the return temperature (for example, about
When it becomes 20 deg) or less, the control device 9'controls the burner 4 for combustion to reduce the hot water going temperature to 70 ° C. Similarly, if the difference between the hot water return temperature and the return temperature becomes less than the temperature (for example, about 15deg),
Reduce to 5 ° C. On the contrary, when the load becomes larger than the forward temperature of the hot water, the difference between the forward temperature and the return temperature increases. That is, if the temperature difference is 15deg or more at the forward temperature of 65 ° C, the forward temperature is raised to 70 ° C, and 80 ° C if the temperature difference is further 29 °
Raise to. Depending on the load, the operation to switch the temperature at this time is 80 ℃ → 70 ℃ → 65 ℃ or 80 ℃ → 70 ℃ → 80 ℃.
In some cases,

In addition, the difference between the forward temperature and the return temperature is constant (for example, 29de
g), the outgoing temperature of the hot water may be changed linearly. FIG. 3 shows the control method. At this time, each temperature is an average temperature. In other words, when the load is large, such as when heating starts, the difference between the forward temperature and the return temperature is large, and even if the forward temperature reaches the maximum temperature of 80 ° C, the difference between the return temperature and the forward temperature is 20 deg or more. In this case, the outgoing temperature is controlled to 80 ° C. When the room warms up, the load will be smaller and the difference between the forward and return temperatures will be smaller.
When it is within 20 deg, the forward temperature is lowered and the difference from the return temperature is controlled to be 20 deg. At this time, when the fan convector 5 is operated by lowering the temperature of the hot water too much, there is a cold sensation, so the minimum going temperature is set to 65 ° C., and the going temperature of the hot water does not fall below that. Also,
When the load increases, the difference between the forward temperature and the return temperature becomes larger than 20deg.
Set to deg. That is, by controlling the forward temperature so that the difference between the forward temperature and the return temperature of the hot water becomes constant, the forward temperature is controlled according to the heating load of the room.

Furthermore, when a bath heater is used, the flow rate of hot water changes by 4 l / min or more, so the flow rate sensor 11 detects this and the fan convector 5 is not used. And then boil the bath. Even when a bath heater is used, the load decreases as the temperature of the bath water rises, and the difference between the hot water return temperature and the return temperature decreases. Also in this case,
There is a difference between the forward temperature and the return temperature (for example, about 20 de
g) is supplied at the maximum temperature of 80 ° C until the temperature reaches a certain temperature difference (for example, about 20 ° C).
deg), the forward temperature is changed linearly or the forward temperature is changed from 80 ° C → 70 ° C →
At 65 ℃, decrease or increase in 3 steps.

EFFECTS OF THE INVENTION As described above, according to the present invention, the control that receives the temperature difference between the hot water return temperature detected by the first sensor and the second sensor provided in the hot water return return path separated from the radiator. The device compares the temperature difference with a predetermined temperature difference and adjusts the balance between the amount of heat consumed by the radiator from the hot water and the amount of heat the burner heats the hot water, and the forward temperature of the hot water is set to the amount of heat consumed by the radiator. By performing the control accordingly, the heat radiation loss amount in the circulation path of the hot water can be reduced as compared with the case where the constant hot water temperature is always used.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a hot water heating apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are diagrams showing a temperature control method according to an embodiment of the present invention, and FIG. 4 is a conventional hot water heating apparatus. It is a whole block diagram of an apparatus. 1 ... Heat exchanger, 3 ... Circulation pump, 6 ... Outgoing line,
7 ... Return line, 8 ... 1st sensor, 10 ... 2nd sensor, 11 ... Flow sensor.

Claims (1)

[Claims] 1. A heat exchanger for heating hot water, a burner for heating the heat exchanger, a circulation pump for feeding the hot water, and a forward temperature of the hot water provided in a forward path of the hot water. A first sensor, a second sensor provided in the return conduit of the hot water for detecting the return temperature of the hot water, and a heat retained by the hot water passing through by connecting to the forward conduit and the return conduit of the hot water. When the difference between the heat radiating radiator and the signals from the first sensor and the second sensor is larger than a predetermined value, the forward temperature of the hot water is raised, and when the difference between the signals is reduced, the forward temperature of the hot water is lowered. And a controller for controlling the heating amount of the burner.