JPH09112932A - Controller for floor heating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a comfortable heating by controlling a circulation flow rate according to a set heating capacity to manage the temperature of a floor surface properly. SOLUTION: When the starting by a floor heating panel 3 of a heating operation is indicated by a remote control 4, the room temperature is detected by a room temperature thermistor 405 for detecting temperature within a room where the floor heating panel 3 is arranged to determine time of opening a flow varying valve 14 continuously from the temperature detected. During the time, the flow varying valve 14 is opened continuously to circulate the hot water continuously to the floor heating panel 3. After the continuously opening time passes, the opening ratio of the flow varying valve 14 is controlled according to a heating level set by the remote control 4 to adjust the heating capacity of the floor heating panel 3. Thus, a large heating value is obtained at the initial operation and thereafter, the opening ratio of the flow varying valve 14 is controlled automatically. For a user, it suffices to set a heating level at the initial operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a floor heating system provided with a floor heating panel having a hot water pipe on the floor.

[0002]

2. Description of the Related Art In a floor heating system, a floor heating panel equipped with hot water pipes for passing hot water is arranged on the floor,
A hot water circulation circuit is formed between the heat exchanger heated by the heating source and the floor heating panel, and the floor surface is heated by circulating hot water of a constant temperature through the floor heating panel. Floor heating has less effect of raising the temperature of the indoor air, as compared with the one that directly heats the indoor air such as a fan heater,
Comfortable heating can be performed by raising the temperature of the floor surface to a desired temperature. The adjustment of the heating capacity depends on the setting heating capacity of the controller operated by the user.
This is done by automatically adjusting the opening ratio of the shutoff valve arranged in the hot water circulation circuit to control the amount of heat radiation in the floor heating panel.

[0003]

As described above, the control of the heat radiation amount (the control of the flow rate) is determined only by the set heating capacity of the controller set by the user, so that the room temperature temporarily fluctuates. However, there is no variation in floor temperature, and stability is excellent. However, the above problems have the following problems when the room temperature is low. That is, when the operation is started with the heating capacity (heat dissipation amount) appropriately set in the steady state, the floor temperature rises slowly at the beginning of operation when the room temperature is low. Therefore, in the initial stage of operation, it is necessary to set a heating capacity different from the set heating capacity in the steady state, and to reset the heating capacity again in the steady state when the room temperature rises, which is troublesome.

An object of the present invention is to provide a floor heating system control device capable of ensuring comfortable heating with a simple operation.

[0005]

The present invention relates to a floor heating system in which a floor water heating panel arranged on the floor of a room is provided with a hot water circulation circuit for circulating hot water heated by a heating source by a pump, A floor heating system controller for controlling a circulating flow rate of hot water according to a heating capacity set in a heating capacity setting means, comprising: a shutoff valve for stopping circulation of the hot water in the hot water circulation circuit. Is provided with a room temperature sensor for detecting the temperature of the room, and when the operation start means is instructed to start the floor heating operation by the floor heating panel, the heating source and the pump are operated. Then, the circulation of the hot water in the hot water circulation circuit is started, the room temperature is detected by the room temperature sensor, and the circulation is continued for a time determined according to the detected temperature. The flow rate and the maximum flow rate, after said time, the technical means to control the circulation flow rate in accordance with the heating capacity set by the heating capacity setting means.

[0006]

According to the present invention, when the operation is instructed by the operation instructing means, the heating source and the pump are activated to start circulating hot water in the hot water circulation circuit. At this time, the room temperature sensor provided in the room detects the room temperature, and the duration of the maximum circulation flow rate is determined based on the detected temperature. During this time, the maximum flow rate of hot water continues in the hot water circulation circuit. Circulate. As a result, heat is continuously radiated from the floor heating panel, so that the room temperature rises quickly. When the time has elapsed, the circulation flow rate is controlled according to the set heating capacity, the floor surface temperature is appropriately managed, and comfortable heating can be performed. After the above time has elapsed, temperature control by the room temperature sensor is not performed, so stable floor heating should be performed without being affected by variations in the detected temperature due to indoor conditions (installation location of the room temperature sensor, etc.). You can The user only has to set the heating level at the start of operation.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on the following embodiments. FIG. 1 shows an embodiment of a hot water heating type air conditioner system according to the present invention. In FIG. 1, 1
Is an outdoor unit having a heating source and a cooling source and installed outdoors, 2
Is an indoor unit arranged on the wall above the room, and is connected to the outdoor unit 1 by a hot water pipe and a cooling pipe.
Is a floor heating panel which has hot water pipes for heat radiation and is arranged on the floor surface in the room, and is connected to the outdoor unit 1 by the hot water pipes. The outdoor unit 1, the indoor unit 2, the floor heating panel 3, the hot water pipe, and the cooling pipe form a hot water circuit 10 for heating and a refrigeration cycle 20, respectively.

In the outdoor unit 1, as a constitution of the hot water circuit 10, a heat exchanger 11 for heating, a circulation pump 12 driven at a constant rotation, a floor warming valve 13, and a needle are driven by a stepping motor to change the flow rate. A variable flow valve 14 for controlling and a pressure tank 15 are provided, and a gas burner 100 as a heating source is provided. The refrigeration cycle 20 includes a compressor 21 and a condenser 2 which are driven by an inverter-controlled motor to compress CFCs that are refrigerants.
2, a strainer 23, a capillary tube 24 are provided, and the condenser 22 is provided with a heat radiation fan 26.
The indoor unit 2 is provided with a heating heat exchanger 16 as a configuration of the hot water circuit 10, and a cooling heat exchanger 25 as a configuration of the refrigeration cycle 20. For each of the heat exchangers 16 and 25, an indoor unit is provided. A convection fan 200 that circulates the air is provided, and the room air is passed through the cooling heat exchanger 25 and the heating heat exchanger 16 in this order, and is again sent indoors.

In the outdoor unit 1, the indoor unit 2 and the floor heating panel 3, in the hot water circuit 10, the inflow side of the heating heat exchanger 11 is connected to the discharge side of the circulation pump 12, and the outflow side of the heating heat exchanger 11 is connected. Is connected to the inflow side of the heating heat exchanger 16 of the indoor unit 2 via the variable flow rate valve 14. The hot water pipe is branched between the inflow side of the heating heat exchanger 11 and the discharge side of the circulation pump 12, and the branched hot water pipe is connected to the inflow side of the floor heating panel 3 via the floor warming valve 13. Has been done. The hot water pipe on the outflow side of the heating heat exchanger 16 and the hot water pipe on the outflow side of the floor heating panel 3 join together and are connected to the suction side of the circulation pump 12 via the pressure tank 15.

The hot water pipe is branched on the outflow side of the heating heat exchanger 11, bypasses the indoor unit 2 and the floor heating panel 3, and a small amount of hot water is supplied from the heating heat exchanger 11 to the circulation pump 12. It is a bypass pipe 17 for direct return, and the outflow side of the bypass pipe 17 is connected to the suction side of the circulation pump 12 and joins with the outflow side of the pressure tank 15.

In the hot water circuit 10 having the above structure, the circulation pump 12 is mainly operated to operate the circulation pump 12 →
In the circulation circuit of the heat exchanger 11 for heating → the variable flow valve 14 → the heat exchanger 16 for heating → the pressure tank 15 → the circulation pump 12, the high temperature water in the heat exchanger 11 for heating heated to high temperature by the burner 100 A circulation pump 12 → floor warming valve 13 →
A low temperature water circulation circuit for circulating the low temperature water returned to the circulation pump 12 is formed by the circulation circuit of the floor heating panel 3 → the pressure tank 15 → the circulation pump 12. In addition, burner 1
The high temperature water in the heating heat exchanger 11 heated by 00 circulates in the circulation circuit of the circulation pump 12 → the heating heat exchanger 11 → the bypass pipe 17 → the circulation pump 12 and circulates to the floor heating panel 3. Heat the hot water in the low-temperature water circulation circuit.

On the other hand, in the refrigerating cycle 20, the CFC refrigerant circulates through the refrigerant compressor 21 → condenser 22 → strainer 23 → capillary tube 24 → cooling heat exchanger 25 → refrigerant compressor 21, and the refrigerant is circulated during the circulation. Is in the vapor phase in the condenser 22 →
The state of the liquid phase is changed to release heat, and the heat exchanger 25 for cooling changes the state of the liquid phase (fog) to the vapor phase to absorb heat and cool the indoor air.

The control device 400 controls various operations by a microcomputer according to the remote controller 4 operated by the user, and the main part is provided in the outdoor unit 1.
In the indoor unit 2, a receiving unit for receiving an infrared operation signal of the remote controller 4, a detecting unit for performing detection by various sensors provided in the indoor unit 2, a driving unit for driving the convection fan 200, A communication unit that communicates control signals between each unit of the indoor unit 2 and the main unit of the outdoor unit 1 is provided. Also, in the main part, a burner 1 that uses gas as fuel
In addition to the microcomputer for main operation including heating operation such as combustion control of No. 00, a cooling microcomputer for controlling the operation of the compressor 21 of the refrigeration cycle 20 in the cooling operation and the dehumidifying operation is separately provided.

The control device 400 controls the various types of control by providing a high temperature water thermistor 401 on the outflow side of the heating heat exchanger 11, the discharge side of the circulation pump 12 and the floor warming valve 13.
Between the low temperature water thermistor 402, the indoor hot water thermistor 403 on the outflow side of the heating heat exchanger 16 of the indoor unit 2, the indoor heat freezing thermistor 404 on the cooling heat exchanger 25, the indoor unit 2
A room temperature thermistor 405 and a humidity sensor 406 are provided inside.

In the hot water heating type air conditioner system having the above-mentioned configuration, the controller 400 controls the independent heating operation only by the indoor unit 2, the floor independent operation only by the floor heating panel 3, and the duet heating by the floor heating panel 3 and the indoor unit 2. The operation, the dry operation using only the indoor unit 2, the duet dry operation using the floor heating panel 3 and the indoor unit 2, and the cooling operation using the indoor unit 2 are controlled. Here, the independent heating operation using only the indoor unit 2, the floor independent operation using only the floor heating panel 3, and the duet heating operation using the floor heating panel 3 and the indoor unit 2 will be described below.

[Independent Heating Operation] In the independent heating operation, the room is heated only by the indoor unit 2. In the independent heating operation, the variable flow rate valve 14 is fully opened in response to the ON operation of the heating operation of the remote controller 4, the driving of the circulation pump 12 is started, the combustion of the burner 100 is started, and the target indoor temperature set by the remote controller 4 is set. Ts and room temperature thermistor 4
The target hot water temperature is determined from 58 ° C. to 85 ° C. based on the room temperature Tr detected by the high temperature water thermistor 401.
The combustion amount of the burner 100 is controlled so that the hot water temperature detected by the target hot water temperature becomes the target hot water temperature. Further, the convection fan 200 of the indoor unit 2 is controlled in eight stages in proportion to the combustion amount of the burner 100. At this time, the floor warming valve 13 of the low temperature water circulation circuit is closed.

[Floor-only operation] In the floor-only operation, heating operation is performed only by the floor heating panel 3. Hereinafter, the floor alone operation will be described with reference to FIG. In the floor alone operation, the floor heating hot dash operation is performed according to the ON operation of the floor heating operation of the remote controller 4. In the floor heating hot dash operation, first, the convection fan 200 of the indoor unit 2 is driven by a breeze for a predetermined time (several tens of seconds) (step 101), thereby causing convection of the indoor air. Then, the room temperature Tr is detected by the room temperature thermistor 405 provided in the indoor unit 2 (step 102). A floor heating hot dash time tp (20 minutes to 3 hours) in which the floor temperature is estimated by this detection and the floor warming valve 13 is continuously opened based on the temperature.
Is calculated (step 103). The floor heating hot dash time tp is calculated to be short when the detected room temperature Tr is high, and to be long when the detected room temperature Tr is low.

In the floor heating hot dash operation, the drive of the circulation pump 12 is started and the combustion of the burner 100 is started. During the floor heating hot dash time tp, the floor heating valve 13 is opened, and the combustion fan 101 and the proportional valve 104 are controlled so that the temperature detected by the high temperature water thermistor 401 becomes 80 ° C. (step 104). As a result, the hot water heated to 80 ° C. by the burner 100 continuously passes through the floor heating panel 3 for the floor heating hot dash time tp immediately after the start of operation and radiates heat. The capacity can be secured and the rise of the indoor temperature is improved.

After the floor heating hot dash time tp has elapsed (YES in step 105), the floor heating heat valve 13 is opened and shut off in accordance with the floor heating level set by the remote controller 4 out of seven stages. The ratio to the time is determined, and the floor warming valve 13 is controlled to open / close at the determined ratio (step 106). At this time, the combustion amount of the burner 100 is controlled so that the temperature detected by the low temperature water thermistor 402 is 60 ° C. The ratio of the opening time and the shut-off time of the floor heating / valve 13 is such that the opening time in a cycle of 20 minutes is 20 at the maximum floor heating level.
The minimum floor heating level is set to 3 minutes, and the floor heating level in between is set to 3 minutes to 20 minutes. The floor warming valve 13 controls opening and closing by heat, and although it takes time to open and close, when the circulation of hot water is stopped, the hot water circulation circuit can be reliably closed by a large operating force. In the floor heating operation, the variable flow valve 14 is closed.

[Duet heating operation] In the duet heating operation, the indoor unit 2 and the floor heating panel 3 heat the room. In the duet heating operation, for the floor heating panel 3, the floor heating hot dash operation is controlled in the same manner as in the case of the floor single operation described above, and the combustion heat amount of the heating heat exchanger 11 is controlled as the combustion amount control after the burner 100 is ignited. The high-temperature water thermistor 401 provided on the outflow side detects the high-temperature water temperature, and the burner 1 adjusts the temperature to 80 ° C.
The combustion amount of 00 is feedback-controlled.

To control the hot water to the indoor unit 2, the required heat quantity Q to be released into the room is calculated based on the set temperature Ts of the remote controller 4 and the indoor temperature Tr detected by the room temperature thermistor 405 provided in the indoor unit 2. Then, the flow rate variable valve 14 is controlled so that the hot water flow rate L such that the required heat quantity Q is radiated by the heating heat exchanger 16 of the indoor unit 2 is obtained. Note that, for example, when the opening degree of the flow rate variable valve 14 is reduced in order to reduce the flow rate to the heating heat exchanger 16, the flow rate to the bypass pipe 17 increases, so the flow rate to the floor heating panel 3 (for heating Bypass pipe 1 to the flow rate flowing through the heat exchanger 16
The flow rate through 7) does not change. That is, even if the opening degree of the flow rate variable valve 14 changes, the flow rate to the floor heating panel 3 does not change. Although the flow rate to the floor heating panel 3 does not change in this way, the temperature of the hot water supplied to the floor heating panel 3 changes, so when performing the floor heating hot dash operation, the hot dash time is set for the floor single operation. It is set to a different value from.

The amount of heat radiated in the heating heat exchanger 16 depends on the temperature difference between the inflow hot water temperature Tin flowing into the heating heat exchanger 16 and the outflow hot water temperature Tout flowing out from the heating heat exchanger 16, and Q = L × (Tin−Tout) Equation 1 is obtained from the flow rate L of hot water flowing through the heat exchanger 16, and therefore the hot water flow rate L is determined by L = Q / (Tin−Tout) Equation 2. Therefore, when the required heat quantity Q is calculated, if the inflow warm water temperature Tin and the outflow warm water temperature Tout are detected, the warm water flow rate L can be calculated by the above equation 2, and the calculated warm water flow rate L can be obtained. The variable flow valve 14 may be controlled.

However, in this embodiment, since the water amount sensor for detecting the amount of water circulating through the heating heat exchanger 16 of the indoor unit 2 is not provided, the flow rate variable valve based on the amount of water calculated by the above equation (2). I can't control 14. Therefore, in practice, the variable flow valve 14 is controlled as follows.

Hot water temperature Tin flowing into the heat exchanger 16 for heating
Is constant, for example, if the indoor temperature Tr1 is the same, the outflow hot water temperature Tout1 is expressed as Tout1 = F1 (L) ... Equation 3 as a function F1 that changes according to the hot water flow rate L. Similarly, for different indoor temperatures Trn, Toutn = Fn (L) ...

Therefore, when the inflow hot water temperature Tin to the heating heat exchanger 16 is constant, the hot water flow rate L at a certain room temperature Tr is expressed as an inverse function of the outflow hot water temperature Tout n. That is, if the indoor temperature Tr and the outflow hot water temperature Tout are detected, the hot water flow rate L can be obtained.

In this embodiment, the temperature Tin of the hot water flowing into the heat exchanger 16 for heating is controlled to a constant temperature of 80 ° C.
For each room temperature Tr, the relationship between the outflow hot water temperature Tout and the hot water flow rate L is stored in advance as data,
The indoor temperature Tr is detected, and the flow rate variable valve 14 is controlled so that the outflow hot water temperature Tout at the detected indoor temperature Tr becomes a temperature corresponding to the hot water flow rate L of the above-described equation 2.

As data to be stored, FIG. 3 shows an example of the relationship between the hot water flow rate L and the outflow hot water temperature Tout relating to the detected room temperature Tr. As is clear from the figure, when the indoor temperature Tr is specified, the outflow hot water temperature Tout corresponding to the hot water flow rate L is determined, so the flow rate variable valve 14 is set so that the outflow hot water temperature Tout corresponding to the hot water flow rate L is detected. You can see that it should be adjusted. In addition, the heat exchanger 1 for heating
The inflow hot water temperature Tin to 6 is detected by the high temperature water thermistor 401, and the outflow hot water temperature Tout is detected by the indoor hot water thermistor 403 of the indoor unit 2.

By the above control operation, the flow rate of the heating heat exchanger 16 can be controlled without the flow rate sensor,
The amount of heat radiated in the heating heat exchanger 16 of the indoor unit 2 can be accurately controlled, and more accurate heating operation can be performed even when heating is performed by the floor heating panel 3 at the same time.

In each of the above operations, the burner 10
As the combustion control of 0, the pre-purge is performed by the combustion fan 101 according to the ON operation of each operation, and then the solenoid valves 102, 103 and the proportional valve 104 are controlled in a predetermined sequence to supply the fuel to the burner 100. Then, ignition control is performed to generate a spark discharge at the ignition electrode 105 and start combustion.
After detection of ignition by the flame rod 106, the combustion fan 101 and the proportional valve 104 are controlled to control the combustion amount of the burner 100. After the operation is completed, the burner 100
By stopping the operation of the circulation pump 12 two minutes after the combustion is stopped, the heating operation can be smoothly stopped by utilizing the residual heat. In the above embodiment, the floor warming valve is shown as the shutoff valve, and the opening ratio is controlled by changing the duty ratio of ON and OFF, but the proportional valve is used to open the valve by changing the energizing current. The ratio may be controlled. Although the room temperature thermistor 405 set in the room heater is used as the room temperature sensor in the above embodiment, it may be provided separately, and in this case, it may be installed anywhere in the room.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hot water air conditioner system showing an embodiment of the present invention.

FIG. 2 is a flow chart for explaining a control operation in a floor single operation according to the embodiment of the present invention.

FIG. 3 is a characteristic diagram showing a relationship between a hot water flow rate at each room temperature and an outflow hot water temperature of a heating heat exchanger for explaining control characteristics of a duet heating operation in an example of the present invention.

[Explanation of symbols]

 2 Indoor unit (indoor heater) 3 Floor heating panel 4 Remote control (heating capacity setting means, operation instruction means) 10 Hot water circuit (hot water circulation circuit) 12 Circulation pump 13 Floor warming valve (shutoff valve) 100 Burner (heating source) ) 400 control device (control device for floor heating system) 405 room temperature thermistor (room temperature sensor)

Claims (2)

[Claims] 1. A floor heating system comprising a floor heating panel arranged on a floor in a room, wherein a hot water circulation circuit for circulating hot water heated by a heat source by a pump is circulated. In the control device of the floor heating system, which comprises a shut-off valve for stopping, the circulating flow rate of hot water according to the heating capacity set in the heating capacity setting means, A room temperature sensor for detecting is provided, and when the operation start means is instructed by the operation instructing means for instructing the start of the floor heating operation by the floor heating panel, the heating source and the pump are operated, and the hot water circulation circuit is provided. The circulation of hot water is started, the room temperature is detected by the room temperature sensor, and the circulation flow rate is set to the maximum flow rate for a time determined according to the detected temperature. After between the control unit of the floor heating system and controls the circulation flow rate in accordance with the set the heating capacity by the heating capacity setting means. 2. The room temperature sensor is a room temperature thermistor provided in an indoor heater installed on a wall surface in the room to circulate hot water in the hot water circulation circuit to heat room air. The control device for the floor heating system according to 1.