JP2019152398A - Heating system and its operation method - Google Patents

Abstract

To provide a heating system which can improve heat exchange efficiency, and its operation method.SOLUTION: A floor heating system 1 includes a heat-exchange heating part H2 having a heat exchanger EX for heating a thermal medium by the combustion of a burner g, and an electric heater H2 for heating the thermal medium by carrying electricity thereto. A control part 30 performs control for combusting the thermal medium before being supplied to a floor heating terminal 20 by the burner g of the heat exchanger EX until a return thermal medium temperature which is measured by a temperature sensor TS rises up to a temperature T1, performs control for stopping the combustion of the burner g when the return thermal medium temperature rises up to the temperature T1, and switching the heating of the thermal medium before being supplied to the floor heating terminal 20 by carrying electricity thereto by the electric heater H2, and also performs control for heating the thermal medium before being supplied to the floor heating terminal 20 by the combustion of the burner g when the return thermal medium temperature is lowered to a temperature T2 which is lower than the temperature T1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heating system and an operation method thereof.

  Patent Document 1 discloses a heat exchanger that exchanges heat between hot water and combustion exhaust gas, an electric heater provided in an upstream hot water circulation path upstream of the heat exchanger, and a downstream side of the heat exchanger. A heater including a floor heating panel that receives supply of hot water is disclosed. When heating on the floor heating panel is started, the electric heater is first energized to heat the water. Then, the hot water heated by the electric heater enters the heat exchanger, and the hot water is further heated by the heat of the combustion exhaust gas from the burner combustion. That is, in patent document 1, in addition to combustion of a burner, warm water is heated by the heating of an electric heater.

Thus, by heating with an electric heater before supplying water to a heat exchanger, the dew condensation water which generate | occur | produces on the piping surface arrange | positioned in a heat exchanger at the time of a floor heating operation start can be reduced. Thereby, the failure etc. which generate | occur | produce due to dew condensation water can be reduced.
Note that when the temperature of the electric heater becomes equal to or higher than a predetermined temperature, dew condensation in the pipes in the heat exchanger is sufficiently reduced, so that the energization of the electric heater is stopped.

JP 2011-17511 A

  However, in the heater of patent document 1, since the heating of the warm water by an electric heater and the warm water by the combustion of the burner in a heat exchanger are performed simultaneously, the heat exchange rate in a heat exchanger is bad. In other words, since hot water heated by an electric heater is introduced into the heat exchanger, the temperature difference between the heat of the combustion exhaust gas due to combustion of the burner in the heat exchanger and the hot water is that heat is not heated. The heat exchange rate is reduced compared to the case where the heat exchange rate is reduced.

  Further, when the temperature of the electric heater becomes equal to or higher than a predetermined temperature, the dew condensation in the piping in the heat exchanger is sufficiently reduced, so that the energization of the electric heater is stopped. When the electric heater is stopped, the hot water is heated only by the heat of the combustion exhaust gas from the combustion of the burner in the heat exchanger. In this case, in order to maintain the temperature of the hot water at a desired temperature, combustion by the burner is performed when heating is insufficient, and combustion of the burner is stopped when heating is excessive. As described above, the heat of the combustion exhaust gas generated at the time of switching is exhausted by the intermittent operation in which the combustion and stop of the burner are switched. Thereby, the temperature of a heat exchanger falls and a heat exchange rate worsens.

  Then, this invention is made | formed in view of the above-mentioned subject, and it aims at providing the heating system which can improve a heat exchange rate, and its operating method.

The characteristic configuration of the heating system according to the present invention is:
A circulation path through which the heat medium flows, a heating section that heats the heating medium flowing through the circulation path, and a control section that controls heating of the heating medium in the heating section, and the circulation from the heating section A heating system that supplies a heating medium to at least one heating terminal via a path and returns the heating medium after being supplied to the heating terminal to the heating unit via the circulation path;
The heating unit is
A heat exchange heating unit having a heat exchanger for performing heat exchange between heat generated by combustion of the burner and a heat medium flowing through the circulation path, and heating the heat medium;
An electric heater that heats the heating medium flowing through the circulation path by energization,
The controller is
The heating medium before being supplied to the heating terminal is heated by the burner in the heat exchanger until the temperature of the heating medium after being supplied to the heating terminal rises to a first temperature corresponding to a desired temperature. Control to do by combustion,
When the temperature of the heating medium after being supplied to the heating terminal rises to the first temperature, the combustion of the burner in the heat exchanger is stopped, and heating of the heating medium before being supplied to the heating terminal is performed. Control to switch to perform by energization of the electric heater,
When the temperature of the heating medium after being supplied to the heating terminal is lowered to a second temperature lower than the first temperature, the heating of the heating medium before being supplied to the heating terminal is burned in the burner in the heat exchanger. It is in the point to control to perform by.

  According to this characteristic configuration, when the temperature of the heat medium after being supplied to the heating terminal is increased to the first temperature corresponding to the desired temperature, the controller is configured to use the heat medium before being supplied to the heating terminal. Is controlled so as to be heated by combustion of the burner, and the heating medium before being supplied to the heating terminal is controlled to be heated by the electric heater until the temperature is lowered from the first temperature to the second temperature. In other words, depending on the temperature of the heating medium after being supplied to the heating terminal, heating of the heating medium before being supplied to the heating terminal is switched between the case where the heating medium is performed by burning of the burner and the case where it is performed by the electric heater. . Therefore, the combustion of the burner and the energization of the electric heater are not performed in an overlapping manner, and it is possible to suppress a decrease in the heat exchange rate due to further heating of the heat medium heated by the electric heater with a heat exchanger using the burner combustion. .

  In addition, after the temperature of the heat medium after being supplied to the heating terminal rises to the first temperature due to burner combustion, the control unit stops combustion of the burner and energizes the electric heater to start from the first temperature. The rate of temperature decrease is compensated by supplementing the electric heater with electricity. Thereby, restart of combustion of a burner can be delayed. Therefore, by using the electric heater, it is possible to suppress an increase in the number of intermittent operations in which the burner is repeatedly burned, stopped, and restarted. Therefore, it can suppress that the temperature of a heat exchanger falls by the exhaust heat which arises by intermittent operation, and can improve a heat exchange rate.

The characteristic configuration of the heating system according to the present invention is:
A circulation path through which the heat medium flows, a heating section that heats the heating medium flowing through the circulation path, and a control section that controls heating of the heating medium in the heating section, and the circulation from the heating section A heating system that supplies a heating medium to at least one heating terminal via a path and returns the heating medium after being supplied to the heating terminal to the heating unit via the circulation path;
The heating unit is
A heat exchange heating unit having a heat exchanger for performing heat exchange between heat generated by combustion of the burner and a heat medium flowing through the circulation path, and heating the heat medium;
An electric heater that heats the heating medium flowing through the circulation path by energization,
The controller is
The heating medium before being supplied to the heating terminal is heated by the burner in the heat exchanger until the temperature of the heating medium after being supplied to the heating terminal rises to a first temperature corresponding to a desired temperature. Control to do by combustion,
When the temperature of the heat medium after being supplied to the heating terminal rises to the first temperature, the combustion of the burner in the heat exchanger is stopped, and then the temperature of the heat medium after being supplied to the heating terminal However, when the temperature falls to a second temperature lower than the first temperature, the heating medium before being supplied to the heating terminal is heated by burning the burner in the heat exchanger once, and a burner combustion and stop cycle is performed once. To perform intermittent operation,
When the intermittent operation reaches a predetermined number of times within a predetermined time, the combustion of the burner in the heat exchanger is stopped, and the heating medium before being supplied to the heating terminal is switched to being heated by energization of the electric heater. It is in the point to control.

  The fact that the intermittent operation of the burner is repeated over a predetermined number of times within a predetermined time means that the temperature of the heating medium after being supplied to the heating terminal instantaneously increased to the first temperature due to measurement error, disturbance, etc. Instead, after rising to the first temperature, it can be seen that it continuously moves up and down within a predetermined temperature range between the first temperature and the second temperature. That is, it is possible to accurately grasp that the temperature of the heat medium after being supplied to the heating terminal is fluctuating in a state close to the first temperature to the extent that it moves up and down within a predetermined temperature range.

  Therefore, according to this characteristic configuration, when the above-described state is reached, the control unit stops combustion of the burner and energizes the electric heater, and determines the rate of temperature decrease from the first temperature. Delay by complementing with. Thereby, restart of combustion of a burner can be delayed. Therefore, by using the electric heater, it is possible to suppress an increase in the number of intermittent operations in which the burner is repeatedly burned, stopped, and restarted.

  From the above, it is possible to switch between heating of the heat medium by burning the burner and heating of the heat medium by energizing the electric heater without being affected by the instantaneous change to the first temperature due to measurement error, disturbance, or the like. . Further, since it is not affected by instantaneous temperature fluctuations, the load on the heat exchanger and the electric heater by instantaneous switching can be reduced, and the floor heating system as a whole can be operated with good heat exchange efficiency with the load suppressed.

A further characteristic configuration of the heating system according to the present invention is:
The controller is
The amount of energization of the electric heater is controlled based on a change in the temperature of the heating medium after being supplied to the heating terminal.

  According to this characteristic configuration, the temperature of the heat medium is adjusted to a desired temperature by the control unit controlling the energization amount of the electric heater according to the change in the temperature of the heat medium.

A further characteristic configuration of the heating system according to the present invention is:
The control unit is configured to control the energization amount of the electric heater to be increased according to the elapsed time from the start of energization of the electric heater after the combustion of the burner is stopped.

  The heating amount of the heating medium per unit time by energization of the electric heater is relatively smaller than the heating amount of the heating medium per unit time by the burner combustion. Therefore, even if the heating medium is heated by energization of the electric heater after combustion of the burner is stopped, the temperature of the heating medium decreases with the passage of time. So, according to this characteristic structure, after stopping combustion of a burner, a control part is controlled so that the energization amount of an electric heater becomes large with progress of time. Thereby, the fall of the temperature of a heat medium can be suppressed.

The characteristic configuration of the operation method of the heating system according to the present invention is:
A circulation path through which the heat medium flows, a heating section that heats the heating medium flowing through the circulation path, and a control section that controls heating of the heating medium in the heating section, and the circulation from the heating section An operation method of a heating system that supplies a heating medium to at least one heating terminal via a path and returns the heating medium that has been supplied to the heating terminal to the heating unit via the circulation path,
The heating unit is
A heat exchange heating unit having a heat exchanger for performing heat exchange between heat generated by combustion of the burner and a heat medium flowing through the circulation path, and heating the heat medium;
An electric heater that heats the heating medium flowing through the circulation path by energization,
The controller is
The heating medium before being supplied to the heating terminal is heated by the burner in the heat exchanger until the temperature of the heating medium after being supplied to the heating terminal rises to a first temperature corresponding to a desired temperature. Control to do by combustion,
When the temperature of the heating medium after being supplied to the heating terminal rises to the first temperature, the combustion of the burner in the heat exchanger is stopped, and heating of the heating medium before being supplied to the heating terminal is performed. Control to switch to perform by energization of the electric heater,
When the temperature of the heating medium after being supplied to the heating terminal is lowered to a second temperature lower than the first temperature, the heating of the heating medium before being supplied to the heating terminal is burned in the burner in the heat exchanger. It is in the point to control to perform by.

According to this characteristic configuration, the combustion of the burner and the energization of the electric heater do not overlap, and the heat exchange rate is obtained by further heating the heat medium heated by the electric heater with the heat exchanger using the combustion of the burner. Can be suppressed.
Moreover, it can suppress that the temperature of a heat exchanger falls by the exhaust heat which arises by intermittent operation, and can improve a heat exchange rate.

The characteristic configuration of the operation method of the heating system according to the present invention is:
A circulation path through which the heat medium flows, a heating section that heats the heating medium flowing through the circulation path, and a control section that controls heating of the heating medium in the heating section, and the circulation from the heating section A heating system that supplies a heating medium to at least one heating terminal via a path and returns the heating medium after being supplied to the heating terminal to the heating unit via the circulation path;
The heating unit is
A heat exchange heating unit having a heat exchanger for performing heat exchange between heat generated by combustion of the burner and a heat medium flowing through the circulation path, and heating the heat medium;
An electric heater that heats the heating medium flowing through the circulation path by energization,
The controller is
The heating medium before being supplied to the heating terminal is heated by the burner in the heat exchanger until the temperature of the heating medium after being supplied to the heating terminal rises to a first temperature corresponding to a desired temperature. Control to do by combustion,
When the temperature of the heat medium after being supplied to the heating terminal rises to the first temperature, the combustion of the burner in the heat exchanger is stopped, and then the temperature of the heat medium after being supplied to the heating terminal However, when the temperature falls to a second temperature lower than the first temperature, the heating medium before being supplied to the heating terminal is heated by burning the burner in the heat exchanger once, and a burner combustion and stop cycle is performed once. To perform intermittent operation,
When the intermittent operation reaches a predetermined number of times within a predetermined time, the combustion of the burner in the heat exchanger is stopped, and the heating medium before being supplied to the heating terminal is switched to being heated by energization of the electric heater. It is in the point to control.

According to this characteristic configuration, when intermittent operation in which the combustion of the burner is repeatedly stopped and restarted is performed, the heating medium is heated using an electric heater, whereby the operation of the intermittent operation in which the burner is repeatedly burned, stopped, and restarted is performed. An increase in the number of times can be suppressed.
In addition, the floor heating system as a whole can be operated with good heat exchange efficiency with a reduced load without being affected by instantaneous fluctuations to the first temperature due to measurement errors, disturbances, and the like.

It is a block diagram which shows the whole schematic structure of a floor heating system. It is the schematic diagram which showed typically the heating control of the heat medium by switching with a heat exchanger heating part and an electric heater. It is an example of the flowchart which shows the flow of heating control of the heat medium of FIG. It is the schematic diagram which showed typically the heating control of the heat medium switched to an electric heater after the intermittent driving | operation by a heat exchanger heating part. It is an example of the flowchart which shows the flow of the heating control of FIG.

Embodiment
Below, the floor heating system (heating system) 1 which concerns on embodiment of this invention is demonstrated.

(1) Configuration of Floor Heating System As shown in FIG. 1, the floor heating system 1 includes a heat exchanger (heating unit) H1 that heats a heat medium (for example, but not limited to water). 10, an electric heater (heating unit) H2 that heats the heat medium, a floor heating terminal (heating terminal) 20 that receives supply of the heat medium heated by the heat source device 10 and the heat medium heated by the electric heater H2, and A heating valve V for intermittently supplying the heating medium to the floor heating terminal 20, and heating of the heating medium in the heat exchanger H1 and the electric heater H2, to control heating of the heating medium in the entire floor heating system 1, A control unit 30 that operates and stops the pump P, opens and closes the thermal valve V, a storage unit 35 that stores programs for executing various controls including heating control in the control unit 30, various threshold values, and the like. And the operation, stop and temperature setting of the floor heating terminal 20 from the user Etc., and a receiving unit 40 that receives an input via an operation unit (not shown).

  The floor heating terminal 20 is controlled by the control unit 30 based on an input received by the receiving unit 40 from the user via an operation unit (not shown). The reception unit 40 receives operation, stop, temperature setting, and the like for the floor heating terminal 20 from the user via the operation unit. The operation unit is provided in a space to be heated by the floor heating terminal 20, for example.

  The floor heating terminal 20 is disposed below the floor material in the space to be heated, and allows the passage of the heat medium heated by the heat exchange heating unit (heating unit) H1 or the electric heater (heating unit) H2 of the heat source device 10. It is heated by the flow. The floor heating terminal 20 is configured such that a heat medium flow pipe 23 is provided in a meandering manner in a panel material 21.

  In the heat source device 10, a heat medium going path L1 is connected to an outlet of a heat exchange heating unit H1 described later, and the heat medium going path L1 is connected to a heating going path L3. The heating outbound path L3 is connected to the inlet of the heat medium flow pipe 23 of the floor heating terminal 20. A pump P and a thermal valve V are arranged in the heating outbound path L3. When the control unit 30 controls the opening and closing of the thermal valve V and operates the pump P, the heat medium is intermittently supplied to the floor heating terminal 20.

  For example, when the control unit 30 opens the thermal valve V and activates the pump P, the heat medium heated by either the heat exchange heating unit H1 or the electric heater H2 is heated to the heat medium forward path. The air flows from L1 to the floor heating terminal 20 via the heating outbound path L3. And in the floor heating terminal 20, heat is radiated from the heat medium and the space to be heated is heated.

  The outlet of the heat medium flow pipe 23 of the floor heating terminal 20 is connected to the heating return path L4. Therefore, the heat medium that has come out of the floor heating terminal 20 returns to the heat source apparatus 10 via the heating return path L4, and joins the heat medium return path L2 arranged in the heat source apparatus 10. The heating return path L4 is provided with a temperature sensor TS that measures the temperature of the heat medium returning from the floor heating terminal 20 to the heat source unit 10 (hereinafter referred to as return heat medium temperature).

  Since the temperature sensor TS is provided in the heating return path L4, which is a flow path where the heat medium returns from the floor heating terminal 20 to the heat source device 10, the control unit 30 generally determines the temperature of the heat medium in the floor heating terminal 20. Can be obtained accurately. Therefore, in the heating control of the heating medium, which will be described later, based on the return heating medium temperature, the combustion of the burner g is stopped, the combustion is restarted and the amount of combustion is controlled, and the electric heater H2 is energized, stopped, and the amount of power is controlled. be able to.

  In the present embodiment, the control unit 30 switches between the driving of the heat exchange heating unit H1 of the heat source device 10 and the driving of the electric heater H2, and the circulation paths L1, L2, L3, and L4 (hereinafter referred to as L1 to L4). Heat the internal heating medium. And the heat medium heated by either the drive of the heat exchanger heating part H1 or the drive of the electric heater H2 is supplied to the floor heating terminal 20 by flowing the heat medium through the circulation paths L1 to L4. The heating terminal 20 is warmed.

Here, heating of the heat medium by driving the heat exchanger H1 will be described later. In the heat exchanger EX, heat exchange is performed between the heat of the combustion exhaust gas generated by the combustion of the fuel gas by the burner g and the heat medium. Is done.
Further, the heating of the heating medium by driving the electric heater H2 is performed by adding heat generated by heating the electric heater H2 to the heating medium by energization.

Below, the structure of the heat-source equipment 10 is demonstrated first.
The heat source device 10 includes a heat exchange heating unit H1 that heats the heat medium supplied to the floor heating terminal 20, a heat medium return path L2 that supplies the heat medium to the heat exchange heating unit H1, and a heat medium from the heat exchange heating unit H1. And a heat transfer path L1 for discharging the air.

  The heat exchanger H1 includes a burner g and a heat exchanger EX. The burner g is supplied with fuel gas (for example, city gas 13A) and combusts the fuel gas. The heat of the combustion exhaust gas generated by the combustion of the fuel gas is supplied to the heat exchanger EX. A heat medium return path L2 is connected to the inlet of the heat exchanger EX, and a heat medium forward path L1 extending to the heating forward path L3 is connected to the outlet of the heat exchanger EX.

  Therefore, when the pump P provided in the heat medium delivery path L1 is driven, the heat medium is supplied to the heat exchanger EX via the heat medium return path L2. Then, the heat exchanger EX performs heat exchange between the supplied heat medium and the heat of the combustion exhaust gas, heats the heat medium, and discharges it to the heat medium forward path L1. And the heat medium heated with the heat exchanger EX is supplied to the floor heating terminal 20 from the heat medium going path L1 via the heating going path L3 as above-mentioned.

  Next, the configuration of the electric heater H2 will be described. The electric heater H2 is a member that generates heat when energized. For example, as shown in FIG. 1, the electric heater H2 is provided on the downstream side of the temperature sensor TS in the heating return path L4 among the circulation paths L1 to L4. The electric heater H2 is provided, for example, in a state of being wound around the heating return path L4, in a state of being in contact with the heating return path L4, or the like. However, if the heating medium flowing through the heating return path L4 can be heated, the heating medium need not be provided in contact with the heating return path L4. For example, the heating medium is disposed at a position away from the heating return path L4. Also good.

(2) Heating medium heating control Next, heating medium heating control by the control unit 30 by heating the heat exchange heating unit H1 and heating medium heating by driving the electric heater H2 will be described. To do.
As an example of heating control of the heat medium, in the present embodiment, the first heating control and the second heating control will be described below.

  In the first heating control, heating of the heat medium by driving of the electric heater H2 is stopped while heating of the heat medium by driving of the heat exchanger H1, and heating of the heat medium by driving of the heat exchanger H1 is stopped. While the operation is stopped, the heating medium is heated by driving the electric heater H2.

  In the second heating control, when the intermittent operation of the heat exchange heating unit H1 reaches a predetermined number of times within a predetermined time, the heating medium is heated by driving the electric heater H2. Here, the intermittent operation stops heating of the heat medium by the heat exchange heating unit H1 when the temperature rises to a desired temperature, and resumes heating of the heat medium by the heat exchange heating unit H1 when the temperature drops to some extent from the desired temperature. Driving.

(2-1) First Heating Control (a) Outline of First Heating Control First, an outline of the first heating control will be described with reference to FIG. FIG. 2 shows how the return heat medium temperature measured by the temperature sensor TS changes with the passage of time t on the horizontal axis by the drive control of the heat exchanger H1 and the electric heater H2. Then, as shown in FIG. 2, the control unit 30 heats the heating medium flowing through the circulation paths L1 to L4 by heating the heat exchange heating unit H1 (H1 in FIG. 2) and the electric heater H2. This is performed by switching between heating (H2 in FIG. 2) by driving.

  First, the control part 30 acquires the operation start to the floor heating terminal 20 and desired temperature from the reception part 40, for example in the time t0. The user inputs, for example, a desired heating temperature and a desired heating intensity of the installation space provided with the floor heating terminal 20 to the reception unit 40 as a desired temperature.

In the case of FIG. 2, it is assumed that the receiving unit 40 receives, for example, a temperature T1 (first temperature) as a desired heating temperature or the like set in the installation space. Hereinafter, the control unit 30 determines the temperature of the installation space based on the return heat medium temperature acquired by the temperature sensor TS. That is, here, for the sake of simplicity, it is assumed that the temperature of the installation space matches the return heat medium temperature. Therefore, the control unit 30 determines whether the installation space has reached the desired temperature T1 based on the return heat medium temperature. And the control part 30 shall switch and drive the heat exchanger heating part H1 and the electric heater H2 on the basis of return heat medium temperature.
However, the temperature of the installation space and the temperature of the return heat medium do not necessarily coincide with each other, and may have a certain degree of correlation.

(I) From time t0 to before time t1 (initial operation)
In FIG. 2, in the initial operation at the start of operation, the return heat medium temperature is the temperature T0 at the time t0, and the final desired heating temperature (return heat medium temperature) is the temperature T1. Therefore, the control unit 30 proportionally controls the driving of the heat exchange heating unit H1 from time t0 to time t1 in order to bring the return heat medium temperature closer to the desired temperature T1.

  That is, from time t0 to before time t1, the driving of the heat exchanger H1 is adjusted according to the difference between the return heat medium temperature at the current time and the final desired return heat medium temperature T1. To do. For example, the control unit 30 adjusts the amount of fuel gas supplied to the burner g, and adjusts the amount of fuel gas burned by the burner g.

  Thereby, when the above-mentioned difference is large, the control part 30 adjusts so that the drive of the heat exchanger heating part H1 may become large, ie, the combustion amount of the fuel gas by the burner g may become large. On the other hand, when the above-described difference is small, the control unit 30 adjusts so that the driving of the heat exchange heating unit H1 is small, that is, the amount of combustion of the fuel gas by the burner g is small.

  In the case of FIG. 2, from time t0 to before time t0a, the control unit 30 determines that the difference between the return heat medium temperature at the current time and the final desired return heat medium temperature T1 is large. The heating medium is heated by controlling the driving of the heating unit H1 to be large.

  Next, from time t0a to before time t1, the control unit 30 determines that the difference between the return heat medium temperature at the current time and the final desired return heat medium temperature T1 has decreased, The heating medium is heated by controlling so that the driving of the heat exchanger H1 is reduced.

(Ii) From time t1 to time t1a (switching operation)
Next, the control unit 30 determines that the return heat medium temperature has increased to the temperature T1 at time t1. The control unit 30 stops driving the heat exchange heating unit H1, and switches to heating of the heat medium by driving the electric heater H2.

Here, the heating capacity of the heating medium driven by the electric heater H2 is smaller than the heating capacity of the heating medium driven by the heat exchanger H1. That is, the amount of heat that can be supplied to the heat medium by driving the electric heater H2 is smaller than the amount of heat that can be supplied to the heat medium by driving the heat exchanger H1.
Accordingly, the return heat medium temperature decreases from the temperature T1 toward the temperature T2 (second temperature) from the time t1 to the time t1a.

(Iii) From time t1a to before time t1b (switching operation)
Next, the control unit 30 determines that the return heat medium temperature has dropped to the temperature T2 at time t1a. The control unit 30 stops driving the electric heater H2 and switches to heating of the heat medium by driving the heat exchange heating unit H1.
Therefore, the return heat medium temperature rises from the temperature T2 toward the temperature T1 from the time t1a to the time t1b.

  Here, the return heat medium temperature T2 is a reference temperature for switching from heating of the heating medium by driving the electric heater H2 to heating of the heating medium by driving the heat exchanger H1. This temperature T2 is a value smaller than the desired temperature T1 by a predetermined value, and is not particularly limited. However, it is preferable to set the temperature T2 so as not to hinder the stop of the electric heater H2 and the start of the driving of the heat exchanger H1, for example, by switching from the driving of the electric heater H2 to the driving of the heat exchanger H1. . The temperature T2 is preferably a temperature that is not too far from the desired temperature T1. For example, the temperature T2 is set to such a temperature that the temperature difference from the desired temperature T1 is not too large, and the switching between the driving of the electric heater H2 and the driving of the heat exchange heating unit H1 does not occur too frequently. It is preferable.

(Iv) From time t1b to before time t1c (switching operation)
Next, the control unit 30 determines that the return heat medium temperature has increased to the temperature T1 at time t1b. The control unit 30 stops driving the heat exchange heating unit H1, and switches to heating of the heat medium by driving the electric heater H2.
Accordingly, the return heat medium temperature decreases from the temperature T1 toward the temperature T2 from the time t1b to the time t1c.

(V) From time t1c to before time t2 (switching operation)
Similarly, from time t1c to before t2, the control unit 30 repeats the above operation based on the return heat medium temperature. That is, when the return heat medium temperature falls to the temperature T2, the control unit 30 stops driving the electric heater H2, and switches to heating of the heat medium by driving the heat exchange heating unit H1. On the other hand, when the return heat medium temperature rises to the temperature T1, the control unit 30 stops driving the heat exchange heating unit H1 and switches to heating the heat medium by driving the electric heater H2.

(Vi) After time t2 and after time t3 (switching operation)
When determining that the return heat medium temperature has risen to the temperature T1 at time t2, the control unit 30 stops driving the heat exchange heating unit H1, and switches to heating the heat medium by driving the electric heater H2. In this case, the control unit 30 may control the return heat medium temperature by controlling the energization amount of the electric heater H2 based on the change in the return heat medium temperature.

For example, as illustrated in FIG. 2, the control unit 30 determines that the return heat medium temperature starts to decrease from the temperature T1 and that the difference between the temperature T1 and the return heat medium temperature after the decrease is small (time). (From t2 to before time t3), the energization amount of the electric heater H2 is controlled to be small. On the other hand, while the controller 30 determines that the difference between the temperature T1 and the return heat medium temperature after the decrease is large (after time t3), the controller 30 controls the energization amount of the electric heater H2 to be large.
Thus, the return heat medium temperature is adjusted to a desired temperature by controlling the energization amount of the electric heater H2 according to the change of the return heat medium temperature.

  Further, the control unit 30 stops driving the heat exchange heating unit H1, and the energization amount of the electric heater H2 increases according to the elapsed time after switching to heating of the heat medium by driving the electric heater H2. You may control.

  The heating amount of the heating medium per unit time by energization of the electric heater H2 is relatively smaller than the heating amount of the heating medium per unit time by driving the heat exchange heating unit H1. Therefore, even if the heating medium is heated by energization of the electric heater H2 after the driving of the heat exchanger H1 is stopped, the return heating medium temperature tends to decrease with time. Therefore, after stopping the driving of the heat exchanger H1, the controller 30 controls the energization amount of the electric heater H2 to increase with time. Thereby, the fall of return heating medium temperature can be suppressed.

  After the heating medium is heated by energization of the electric heater H2, when the return heating medium temperature further decreases and falls to the temperature T2 after time t3, the control unit 30 controls the heating medium by driving the electric heater H2 as described above. Heating is stopped and the heating medium is switched to heating by driving the heat exchanger H1. Thereafter, similar control is performed.

  In the above, the control unit 30 controls the energization amount of the electric heater H2 after the time t2. However, such control of the energization amount of the electric heater H2 may be performed from time t1 to time t1a, from time t1b to time t1c, from time t1d to time t1e, or the like.

(B) First Heating Control Flow Next, the first heating control flow will be described with reference to FIG.
Step S1: The control unit 30 receives an input of a desired heating temperature T1 of the installation space from the user via the receiving unit 40. In the initial operation (from time t0 to time t1 in FIG. 2) at the start of operation, the control unit 30 performs proportional control of driving of the heat exchanger heating unit H1 so as to heat the heat medium.

  Step S2: The control unit 30 determines whether or not the return heat medium temperature has increased from the initial temperature T0 to the temperature T1. Control part 30 advances processing to Step S3, when return heating medium temperature is rising to temperature T1 (Yes in Step S2). On the other hand, when the return heat medium temperature has not risen to temperature T1 (No in step S2), the control unit 30 controls to continue heating the heat medium by driving the heat exchanger heating unit H1.

  Step S3: Since the return heat medium temperature has risen to the temperature T1, the controller 30 stops driving the heat exchanger H1 and switches to heating the heat medium by driving the electric heater H2 (time in FIG. 2). t1, t1b, t1d, t2, etc .: switching operation).

  Step S4: The control unit 30 determines whether or not the return heat medium temperature has decreased to the temperature T2. Control part 30 advances processing to Step S5, when return heat medium temperature is falling to temperature T2 (Yes in Step S4). On the other hand, when the return heat medium temperature has not fallen to temperature T2 (No in step S4), control unit 30 performs control to continue heating of the heat medium by driving electric heater H2.

  Step S5: Since the return heat medium temperature is lowered to the temperature T2, the control unit 30 stops driving the electric heater H2 and switches to heating the heat medium by driving the heat exchange heating unit H1 (time in FIG. 2). t1a, t1c, t1e, etc .: switching operation).

  Step S6: Further, the control unit 30 determines whether or not the return heat medium temperature has risen to the temperature T1. If the return heat medium temperature has risen to temperature T1 (Yes in step S6), the process returns to step S3. On the other hand, when the return heat medium temperature has not risen to temperature T1 (No in step S6), the control unit 30 performs control so as to continue heating the heat medium by driving the heat exchanger heating unit H1.

(C) Effects of First Heating Control According to the above configuration, when the temperature of the heat medium after being supplied to the floor heating terminal 20 is increased to the temperature T1 corresponding to the desired temperature, the control unit 30 controls the heating medium before being supplied to the floor heating terminal 20 to be heated by driving the heat exchanger H1, and before being supplied from the temperature T1 to the temperature T2, before being supplied to the floor heating terminal 20. The heating medium is controlled to be heated by driving the electric heater H2. That is, according to the temperature of the heating medium after being supplied to the floor heating terminal 20, heating of the heating medium before being supplied to the floor heating terminal 20 is performed by driving the heat exchanger unit H1, and an electric heater This is switched to the case of performing by driving H2. Therefore, the driving of the heat exchange heating unit H1 and the driving of the electric heater H2 are not overlapped, and the heat medium heated by the electric heater H2 is further heated by the heat exchange heating unit H1, thereby reducing the heat exchange rate. Can be suppressed.

  In addition, after the temperature of the heat medium after being supplied to the floor heating terminal 20 has been raised to the temperature T1 by the heat exchange heating unit H1, the control unit 30 stops driving the heat exchange heating unit H1 and electric heater H2 is energized, and the rate of temperature decrease from temperature T1 is delayed by complementing the electric heater H2. Thereby, the drive restart of the heat exchanger heating part H1 can be delayed. Therefore, by using the electric heater H2, it is possible to suppress an increase in the number of intermittent operations in which the heat exchange heating unit H1 is repeatedly driven, stopped, and restarted. Therefore, it can suppress that the temperature of the heat exchanger EX falls by the exhaust heat which arises by intermittent operation, and can improve a heat exchange rate.

(2-2) Second Heating Control (a) Outline of Second Heating Control Next, an outline of the second heating control will be described with reference to FIG. In FIG. 4, by controlling the heating by the driving of the heat exchanger H1 (H1 in FIG. 2) and the heating by the driving of the electric heater H2 (H2 in FIG. 2), the time t on the horizontal axis is controlled. It is shown that the return heat medium temperature measured by the temperature sensor TS changes with time.

  And unlike the 1st heating control shown in FIG. 2, the control part 30 is intermittent of the heat exchanger heating part H1 in heating the heating medium which flows through the circulation paths L1-L4, as shown in FIG. When the number of operations N is greater than or equal to a predetermined number of times within a predetermined time, the heating medium is switched to be heated by driving the electric heater H2. In the following, differences from the first heating control will be mainly described, and description of the same points as the first heating control will be omitted or simplified.

  First, similarly to the first heating control, the control unit 30 starts operation of the floor heating terminal 20 from the reception unit 40, for example, at time t0, and performs desired heating of the installation space in which the floor heating terminal 20 is provided. For example, it is assumed that a temperature T1 (first temperature) is received as the temperature or the like.

(I) From time t0 to before time t1 (initial operation)
In FIG. 2, in the initial operation at the start of operation, the return heat medium temperature is the temperature T0 at the time t0, and the final desired heating temperature (return heat medium temperature) is the temperature T1. Therefore, the control unit 30 proportionally controls the driving of the heat exchange heating unit H1 from time t0 to time t1 in order to bring the return heat medium temperature closer to the desired temperature T1.

(Ii) From time t1 to time t2 (intermittent operation)
Next, the control unit 30 determines that the return heat medium temperature has increased to the temperature T1 at time t1. The control unit 30 stops driving the heat exchange heating unit H1. In the intermittent operation from time t1 to time t2, the driving of the electric heater H2 is also stopped.
Since the driving of the heat exchanger H1 is stopped and the heating medium is not heated, the return heating medium temperature decreases from the temperature T1 toward the temperature T4 (second temperature) from the time t1 to the time t1a. .

  Here, the temperature T4 of the return heat medium temperature is a reference temperature for switching between stopping and restarting heating of the heat medium by driving the heat exchange heating unit H1. This temperature T4 is a value smaller than the desired temperature T1 by a predetermined value, and is not particularly limited. However, it is preferable to set a temperature T4 at which the heat exchange heating unit H1 does not break down due to excessive repetition of stopping and restarting heating of the heat medium by driving the heat exchange heating unit H1. The temperature T4 is preferably a temperature that is not too far from the desired temperature T1. For example, the temperature T4 is preferably set to a temperature at which the temperature difference from the desired temperature T1 is not too large and the heat exchanger H1 is not frequently driven and stopped.

  And the control part 30 counts 1 cycle from the drive of the heat exchanger heating part H1 to a stop as the number of times of intermittent operation N = "1". Since the driving of the heat exchanger H1 is stopped at the time t1 from the state in which the heat exchanger H1 prior to the time t1 is driven, the control unit 30 performs one cycle from the driving to the stop. The number of intermittent operations N is counted as “1”.

Next, the control unit 30 determines that the return heat medium temperature has dropped to the temperature T4 at time t1a. The control unit 30 resumes driving of the heat exchange heating unit H1.
Since the driving of the heat exchanger H1 is resumed and the heat medium is heated, the return heat medium temperature rises from the temperature T4 to the temperature T1 from the time t1a to the time t1b.

Next, the control unit 30 determines that the return heat medium temperature has increased to the temperature T1 at time t1b. The control unit 30 stops driving the heat exchange heating unit H1.
Since the driving of the heat exchanger H1 is stopped and the heating medium is not heated, the return heating medium temperature decreases from the temperature T1 to the temperature T4 from the time t1b to the time t1c.

  And since the drive of the heat exchanger heating part H1 is stopped in the time t1b from the state in which the heat exchanger heating part H1 before the time t1b is driving, the control part 30 is 1 cycle from these driving to a stop. Is added to the number of intermittent operations N, and the number of intermittent operations N is counted as “2”.

  From time t1c to t2 before, the control unit 30 repeats the above operation based on the return heat medium temperature. That is, when the return heat medium temperature falls to the temperature T4, the control unit 30 resumes heating the heat medium by driving the heat exchange heating unit H1, while when the return heat medium temperature rises to the temperature T1, the heat exchange heating. The drive of the part H1 is stopped.

  And since the drive of the heat exchanger heating part H1 is stopped in the time t1d from the state in which the heat exchanger heating part H1 before the time t1d is driving, the control part 30 adds the frequency | count N of intermittent operation. The number of intermittent operations N is counted as “3”.

(Iii) From time t2 to before time t4 (switching operation)
Next, the control unit 30 determines that the return heat medium temperature has risen to the temperature T1 at time t2. The control unit 30 stops driving the heat exchange heating unit H1.
Furthermore, since the driving of the heat exchanger H1 is stopped at the time t2 from the state in which the heat exchanger H1 before the time t2 is driven, the controller 30 adds the number of intermittent operations N. The number of intermittent operations N is counted as “4”.

  The control unit 30 switches the heating medium to be heated by driving the electric heater H2 when the intermittent operation of the heat exchange heating unit H1 becomes Nth or more a predetermined number of times within a predetermined time Tth. For example, it is assumed that the length from time t1 to time t1e is within a predetermined time Tth and the predetermined number of times Nth is “4”.

  The predetermined time Tth and the predetermined number of times Nth are not particularly limited, but the heating efficiency of the heat medium of the heat source device 10 is not too low and the failure of the heat source device 10 is caused by repeated driving and stopping of the heat exchanger H1. It is preferable that it is determined based on the fact that it does not occur.

  Based on the count result, for example, at time t2, the control unit 30 determines that the length from time t1 to time t2 is within the predetermined time Tth, and the intermittent operation count N = “4” is the predetermined count Nth = “ It is determined that it is 4 ″ or more.

  Then, based on the determination result of the number of intermittent operations N described above, the control unit 30 stops driving the heat exchange heating unit H1 at time t2 and switches to heating the heating medium by driving the electric heater H2. In this case, the control unit 30 may control the return heat medium temperature by controlling the energization amount of the electric heater H2 based on the change in the return heat medium temperature.

  For example, as illustrated in FIG. 4, the control unit 30 determines that the return heat medium temperature starts to decrease from the temperature T1 and that the difference between the temperature T1 and the return heat medium temperature after the decrease is small (time). (From t2 to before time t3), the energization amount of the electric heater H2 is controlled to be small. On the other hand, while the control unit 30 determines that the difference between the temperature T1 and the return heat medium temperature after the decrease is large (from time t3 to before t4), the control unit 30 largely controls the energization amount of the electric heater H2.

  Further, the control unit 30 stops driving the heat exchange heating unit H1, and the energization amount of the electric heater H2 increases according to the elapsed time after switching to heating of the heat medium by driving the electric heater H2. You may control.

(Iv) After time t4 (switching operation)
When the return heat medium temperature falls to temperature T3, the control unit 30 stops heating the heat medium by the electric heater H2, and switches to heating the heat medium by driving the heat exchange heating unit H1. Thereby, after the time t4, the return heat medium temperature is rising toward the temperature T1.

  Although the temperature T3 is an arbitrary value lower than the temperature T1, for example, in the heating of the heat medium by the electric heater H2, a value where the difference from the temperature T1 becomes too large is set.

  After the time t4, when the intermittent operation of the heat exchange heating unit H1 as described above occurs, the control unit 30 starts heating the heat medium by driving the heat exchange heating unit H1 and heats the electric heater H2 as described above. Switch to medium heating.

  As another method, the control unit 30 may control the floor heating system 1 by the first heating control after time t4. For example, when the return heat medium temperature rises to temperature T1, the control unit 30 stops heating the heat medium by driving the heat exchange heating unit H1, and switches to heating the heat medium by the electric heater H2. Conversely, when the return heat medium temperature falls to temperature T4, the control unit 30 stops heating the heat medium by the electric heater H2, and switches to heating the heat medium by driving the heat exchange heating unit H1.

(B) Second Heating Control Flow Next, the first heating control flow will be described with reference to FIG.
Step S11: The control unit 30 receives an input of a desired heating temperature T1 of the installation space from the user via the receiving unit 40. In the initial operation at the start of operation (from time t0 to time t1 in FIG. 4), the control unit 30 controls the drive of the heat exchanger heating unit H1 in proportion to control the heating medium to be heated.

  Step S12: The control unit 30 determines whether or not the return heat medium temperature has increased from the initial temperature T0 to the temperature T1. Control part 30 advances processing to Step S13, when return heat medium temperature is rising to temperature T1 (Yes in Step S12). On the other hand, when the return heat medium temperature has not risen to temperature T1 (No in step S12), the control unit 30 performs control so as to continue heating the heat medium by driving the heat exchanger heating unit H1.

  Step S13: Since the return heat medium temperature has risen to the temperature T1, the control unit 30 stops driving the heat exchanger H1 (time t1, t1b, t1d, t2, etc. in FIG. 2: intermittent operation).

  Step S14: The control unit 30 counts one cycle from driving to stopping the heat exchange heating unit H1 as the number of intermittent operations N = “1”, and adds the count every time it counts.

  Step S15: The control unit 30 determines whether or not the number of intermittent operations N is equal to or greater than the predetermined number Nth within the predetermined time Tth. When the intermittent operation number N becomes equal to or greater than the predetermined number Nth within the predetermined time Tth (Yes in Step S15), the control unit 30 advances the process to Step S16.

  On the other hand, when the number N of intermittent operations is less than the predetermined number Nth within the predetermined time Tth (No in step S15), the control unit 30 advances the process to step S20.

  Step S16: When the number N of intermittent operations becomes equal to or greater than the predetermined number Nth within the predetermined time Tth, the control unit 30 stops driving the heat exchange heating unit H1 and heats the heat medium by driving the electric heater H2. Switch to.

  Step S17: After starting the driving of the electric heater H2, the control unit 30 determines whether or not the return heat medium temperature has decreased to the temperature T3. If the return heat medium temperature has decreased to temperature T3 (Yes in step S17), control unit 30 advances the process to step S18. On the other hand, when the return heat medium temperature has not dropped to temperature T3 (Yes in step S17), control unit 30 continues heating the heat medium by driving electric heater H2.

  Step S18: When the return heat medium temperature falls to the temperature T3, the control unit 30 stops the heating of the heat medium by the electric heater H2.

  Step S19: The control unit 30 resets the number of intermittent operations N to “0”.

  Step S20: When the number of intermittent operations N does not satisfy the predetermined condition, the control unit 30 continues the cycle from the driving of the heat exchanger heating unit H1 to the stop. Therefore, the control unit 30 determines whether or not the return heat medium temperature has decreased to the temperature T4. If the return heat medium temperature has decreased to temperature T4 (Yes in step S20), control unit 30 advances the process to step S21.

  On the other hand, when the return heat medium temperature has not decreased to the temperature T4 (No in step S20), the control unit 30 continues to stop driving the heat exchanger heating unit H1.

  Step S21: The control unit 30 stops the heating of the heating medium by the electric heater H2 when the return heating medium temperature decreases to the temperature T4 (Yes in Step S20), and resets the number of intermittent operations N (Step S18, S19), controlling the heating medium to be heated by driving the heat exchanger H1.

  Step S22: The controller 30 determines whether or not the return heat medium temperature has risen to the temperature T1. When the return heat medium temperature rises to temperature T1 (Yes in step S22), control unit 30 returns the process to step S13. On the other hand, if the return heat medium temperature has not risen to temperature T1 (No in step S22), the control unit 30 continues heating the heat medium by driving the heat exchange heating unit H1.

(C) Effects of Second Heating Control The intermittent operation of the heat exchanger H1 is repeated over a predetermined number of times Nth within a predetermined time Tth, which means that the heating medium after being supplied to the floor heating terminal 20 The temperature does not increase instantaneously to the temperature T1 due to measurement error, disturbance, etc., but after rising to the temperature T1, it continuously moves up and down within a predetermined temperature range between the T1 temperature and the temperature T4. I understand that That is, it is possible to accurately grasp that the temperature of the heat medium after being supplied to the floor heating terminal 20 varies in a state close to the temperature T1 to the extent that it moves up and down within a predetermined temperature range.

  So, according to said structure, when it will be in the above-mentioned state, the control part 30 stops the combustion of the heat exchanger heating part H1, energizes the electric heater H2, and the rate of temperature fall from the temperature T1. Is delayed by complementation by energization of the electric heater H2. Thereby, the drive restart of the heat exchanger heating part H1 can be delayed. Therefore, by using the electric heater H2, it is possible to suppress an increase in the number of intermittent operations in which the heat exchange heating unit H1 is repeatedly driven, stopped, and restarted.

  As described above, the heating of the heat medium by driving the heat exchanger H1 and the heating of the heating medium by energization of the electric heater H2 are not affected by the instantaneous fluctuation to the temperature T1 due to measurement error, disturbance, or the like. Can be switched. Moreover, since it is not influenced by instantaneous temperature fluctuations, the load on the heat exchanger EX and the electric heater H2 by instantaneous switching is reduced, and the floor heating system 1 as a whole can be operated with good heat exchange efficiency with the load suppressed. .

If the drive of the heat exchanger H1 is stopped immediately if the temperature instantaneously rises to the temperature T1 due to measurement error, disturbance, etc., then the measurement error, disturbance, etc. immediately disappear after that, When the temperature T1 decreases to the temperature T2, the driving of the heat exchanger heating unit H1 is started again. Combustion exhaust gas is generated by instantaneously stopping and restarting the heat exchange heating unit H1, and the heat exchange rate of the heat exchanger EX is reduced, and the heat exchanger EX is damaged. Similarly, even when the electric heater H2 is energized instantaneously, a load is applied to the electric heater H2, causing a failure or the like.
[Other Embodiments]

(1) In the above embodiment, the reference for switching between heating of the heating medium by driving the heat exchanger H1 and heating of the heating medium by driving the electric heater H2 is the return heating medium temperature.
However, the reference for switching is not limited to this. For example, the required heat amount threshold value that determines the magnitude of the required heat amount Q required to bring the floor heating terminal 20 and the space in which the floor heating terminal 20 is disposed to a desired temperature is used. It may be Qth. In this case, when the required heat amount Q is equal to or greater than the required heat amount threshold value Qth (required heat amount Q ≧ required heat amount threshold value Qth), the control unit 30 controls to heat the heat medium by driving the heat exchange heating unit H1. At this time, the control unit 30 does not drive the electric heater H2.

  On the other hand, when the required heat quantity Q is less than the required heat quantity threshold value Qth (required heat quantity Q <required heat quantity threshold value Qth), the control unit 30 controls to heat the heat medium by driving the electric heater H2. At this time, the control unit 30 does not drive the heat exchanger heating unit H1.

  Also in the above case, depending on the number of intermittent operations of the heat exchange heating unit H1, the heating medium heating by driving the heat exchange heating unit H1 may be switched to heating the heating medium by driving the electric heater H2. Good.

  In addition, although it is an example, the required heat quantity Q is calculated | required per unit time, for example, the specific heat of a heating medium, the heating medium quantity heated per unit time, the desired temperature of the heating medium of the floor heating terminal 20, and the said unit It can be calculated using a difference from the actual temperature of the heat medium in time.

(2) In the above embodiment, the temperature sensor TS is provided in the vicinity of the electric heater H2 in the heating return path L4, but the installation position of the temperature sensor TS is not limited to this. For example, if it is possible to detect a temperature at which it is possible to determine whether the floor temperature of the floor heating terminal 20 and the temperature corresponding to the floor temperature have reached a desired temperature, the temperature sensor TS is provided for the heating return path L4 and the heating medium return path L2. It may be installed at any position.

  Further, the temperature sensor TS is provided at any one of the temperature sensor TSA provided at any position of the heating medium outgoing path L1 and the heating outgoing path L3, and at any position of the heating return path L4 and the heating medium return path L2. Temperature sensor TSB may be included. In this case, the control unit 30 sets the floor temperature of the floor heating terminal 20 to a desired value based on the comparison result between the temperature of the heat medium detected by the temperature sensor TSA and the temperature of the heat medium detected by the temperature sensor TSB. It may be determined whether the temperature has been reached. For example, when the difference between the comparison results is small, the control unit 30 may determine that the floor temperature has reached a desired temperature.

  Further, for example, the temperature sensor TS may be provided on the upper surface of the panel material 21 of the floor heating terminal 20 to detect the floor temperature. Further, for example, the temperature sensor TS may be a room temperature sensor attached to a heating target space in which the floor heating terminal 20 is provided.

(3) In the above embodiment, the electric heater H2 is provided in the heating return path L4. However, the position of the electric heater H2 is not limited to this, and may be provided at any position on the circulation paths L1 to L4, for example.

(4) In the above embodiment, the heat medium heated by the electric heater H2 is supplied to the floor heating terminal 20 via the heating return path L4, the heat medium return path L2, the heat medium forward path L1, and the heating forward path L3. The However, for example, the heating return path L4 and the heating medium forward path L1 are connected by a bypass path (not shown), and the heating medium heated by the electric heater H2 is used as the heating return path L4, the bypass path, and the heating medium. It may be supplied to the floor heating terminal 20 via the outgoing route L1 and the heating outgoing route L3. That is, in this case, the heat medium heated by the electric heater H2 does not flow through the heat exchange heating unit H1.

  One end of such a bypass path is connected to the downstream side of the electric heater H2 in the heating return path L4, for example, via a switching valve, and the other end is connected to the outlet of the heat exchange heating unit H1. At L1, it is connected to the downstream side of the pump P via a switching valve. And when heating of a heat medium is performed in the heat exchanger heating part H1, the control part 30 controls a switching valve so that a heat medium may not flow through the inside of a bypass. On the other hand, when heating of the heat medium is switched to the electric heater H2, the control unit 30 causes the heat medium to flow from the heating return path L4 to the bypass path, and from the bypass path to the heat medium forward path L1 and the heating forward path L3. The switching valve is controlled so that the heating medium does not flow from the heating return path L4 to the heating medium return path L2. Thereby, the heating of the heat medium in the heat exchanger H1 and the heating of the heat medium in the electric heater H2 may be physically separated.

(5) In the above embodiment, the control unit 30 is provided in the heat source unit 10. However, the control unit 30 may be provided outside the heat source device 10. For example, the floor heating system 1 may include a control unit 30 that can communicate with the heat source unit 10, the thermal valve V, the operation unit, and the like separately from the heat source unit 10. Further, a part of the function of the control unit 30 may be provided in the heat source apparatus 10 and the remaining part may be provided outside the heat source apparatus 10.

(6) Although the floor heating system 1 of the above embodiment includes one floor heating terminal 20 as a heating terminal, a plurality of floor heating terminals 20 may be provided. Furthermore, in the said embodiment, although the floor heating terminal 20 was mentioned as an example as a heating terminal, as a heating terminal, it is not limited to this. For example, the heating terminal may be a bathroom dryer or the like. Moreover, a different kind of apparatus may be used as a heating terminal. For example, a floor heating terminal and a bathroom dryer may be used as the heating terminal.

(7) Although the pump P is provided in the heat medium return path L2, it is only necessary that the heat medium can be circulated in the floor heating system 1 by the pump P, and the installation position is not limited to the heat medium return path L2. For example, the pump P may be provided in the heat transfer path L1.

  Note that the configurations disclosed in the above-described embodiments (including the other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in the other embodiments unless there is a contradiction. The embodiments disclosed in this specification are exemplifications, and the embodiments of the present invention are not limited thereto, and can be appropriately modified without departing from the object of the present invention.

1: Floor heating system 20: Floor heating terminal 30: Control unit H1: Heat exchange heating unit H2: Electric heaters L1 to L4: Circulation path g: Burner

Claims (6)

A circulation path through which the heat medium flows, a heating section that heats the heating medium flowing through the circulation path, and a control section that controls heating of the heating medium in the heating section, and the circulation from the heating section A heating system that supplies a heating medium to at least one heating terminal via a path and returns the heating medium after being supplied to the heating terminal to the heating unit via the circulation path;
The heating unit is
A heat exchange heating unit having a heat exchanger for performing heat exchange between heat generated by combustion of the burner and a heat medium flowing through the circulation path, and heating the heat medium;
An electric heater that heats the heating medium flowing through the circulation path by energization,
The controller is
The heating medium before being supplied to the heating terminal is heated by the burner in the heat exchanger until the temperature of the heating medium after being supplied to the heating terminal rises to a first temperature corresponding to a desired temperature. Control to do by combustion,
When the temperature of the heating medium after being supplied to the heating terminal rises to the first temperature, the combustion of the burner in the heat exchanger is stopped, and heating of the heating medium before being supplied to the heating terminal is performed. Control to switch to perform by energization of the electric heater,
When the temperature of the heating medium after being supplied to the heating terminal is lowered to a second temperature lower than the first temperature, the heating of the heating medium before being supplied to the heating terminal is burned in the burner in the heat exchanger. Controlled by the heating system. A circulation path through which the heat medium flows, a heating section that heats the heating medium flowing through the circulation path, and a control section that controls heating of the heating medium in the heating section, and the circulation from the heating section A heating system that supplies a heating medium to at least one heating terminal via a path and returns the heating medium after being supplied to the heating terminal to the heating unit via the circulation path;
The heating unit is
A heat exchange heating unit having a heat exchanger for performing heat exchange between heat generated by combustion of the burner and a heat medium flowing through the circulation path, and heating the heat medium;
An electric heater that heats the heating medium flowing through the circulation path by energization,
The controller is
The heating medium before being supplied to the heating terminal is heated by the burner in the heat exchanger until the temperature of the heating medium after being supplied to the heating terminal rises to a first temperature corresponding to a desired temperature. Control to do by combustion,
When the temperature of the heat medium after being supplied to the heating terminal rises to the first temperature, the combustion of the burner in the heat exchanger is stopped, and then the temperature of the heat medium after being supplied to the heating terminal However, when the temperature falls to a second temperature lower than the first temperature, the heating medium before being supplied to the heating terminal is heated by burning the burner in the heat exchanger once, and a burner combustion and stop cycle is performed once. To perform intermittent operation,
When the intermittent operation reaches a predetermined number of times within a predetermined time, the combustion of the burner in the heat exchanger is stopped, and the heating medium before being supplied to the heating terminal is switched to being heated by energization of the electric heater. To control the heating system. The controller is
The heating system according to claim 1 or 2, wherein an energization amount of the electric heater is controlled based on a change in temperature of the heating medium after being supplied to the heating terminal.   4. The heating system according to claim 3, wherein after the combustion of the burner is stopped, the control unit performs control so that an energization amount of the electric heater is increased according to an elapsed time from the start of energization of the electric heater. . A circulation path through which the heat medium flows, a heating section that heats the heating medium flowing through the circulation path, and a control section that controls heating of the heating medium in the heating section, and the circulation from the heating section An operation method of a heating system that supplies a heating medium to at least one heating terminal via a path and returns the heating medium that has been supplied to the heating terminal to the heating unit via the circulation path,
The heating unit is
A heat exchange heating unit having a heat exchanger for performing heat exchange between heat generated by combustion of the burner and a heat medium flowing through the circulation path, and heating the heat medium;
An electric heater that heats the heating medium flowing through the circulation path by energization,
The controller is
The heating medium before being supplied to the heating terminal is heated by the burner in the heat exchanger until the temperature of the heating medium after being supplied to the heating terminal rises to a first temperature corresponding to a desired temperature. Control to do by combustion,
When the temperature of the heating medium after being supplied to the heating terminal rises to the first temperature, the combustion of the burner in the heat exchanger is stopped, and heating of the heating medium before being supplied to the heating terminal is performed. Control to switch to perform by energization of the electric heater,
When the temperature of the heating medium after being supplied to the heating terminal is lowered to a second temperature lower than the first temperature, the heating of the heating medium before being supplied to the heating terminal is burned in the burner in the heat exchanger. The operation method of the heating system controlled to be performed by A circulation path through which the heat medium flows, a heating section that heats the heating medium flowing through the circulation path, and a control section that controls heating of the heating medium in the heating section, and the circulation from the heating section A heating system that supplies a heating medium to at least one heating terminal via a path and returns the heating medium after being supplied to the heating terminal to the heating unit via the circulation path;
The heating unit is
A heat exchange heating unit having a heat exchanger for performing heat exchange between heat generated by combustion of the burner and a heat medium flowing through the circulation path, and heating the heat medium;
An electric heater that heats the heating medium flowing through the circulation path by energization,
The controller is
The heating medium before being supplied to the heating terminal is heated by the burner in the heat exchanger until the temperature of the heating medium after being supplied to the heating terminal rises to a first temperature corresponding to a desired temperature. Control to do by combustion,
When the temperature of the heat medium after being supplied to the heating terminal rises to the first temperature, the combustion of the burner in the heat exchanger is stopped, and then the temperature of the heat medium after being supplied to the heating terminal However, when the temperature falls to a second temperature lower than the first temperature, the heating medium before being supplied to the heating terminal is heated by burning the burner in the heat exchanger once, and a burner combustion and stop cycle is performed once. To perform intermittent operation,
When the intermittent operation reaches a predetermined number of times within a predetermined time, the combustion of the burner in the heat exchanger is stopped, and the heating medium before being supplied to the heating terminal is switched to being heated by energization of the electric heater. To control the heating system operation method.

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