JPH0719502A - Control method of floor heating device - Google Patents

Abstract

PURPOSE:To provide a control method of floor heating device, which utilizes a sensible temperature and permits the realization of comfortable floor heating. CONSTITUTION:A floor heating device, provided with a floor heating panel and a heat source device for supplying hot-water to the floor heating panel through an opening and closing valve, is controlled by a method wherein a sensible temperature is composed of either one of deteted floor temperature, floor heating panel temperature and heating water returning temperature and a detected room temperature while the amount of radiating heat of floor heating is controlled by said sensible temperature so as to approach the sensible temperature to a set isotherm of sensible temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor heating system control method for circulating hot water through a floor heating panel.

[0002]

2. Description of the Related Art As a floor heating device for circulating hot water in a floor heating panel, a hot water pipe introduced from a heat source device (for example, a gas combustion device) is piped to a floor heating panel laid inside a room. The on-off valve provided in the pipe is opened and closed in a constant cycle according to the difference between the room temperature and the set temperature, and the valve opening time is continuously changed to control the bed temperature.

Various methods have been proposed for conventional floor heating control. First, as shown in FIG. 3, there is a method of detecting only room temperature and keeping it constant, and then opening or closing the heating water valve or turning on or off the heat source device. However, according to this method, when the outside air temperature rises, the room temperature falls and becomes cold. And
It will operate regardless of whether the floor temperature is high or low, it will be turned on after the operation cycle becomes long and the floor has cooled, and conversely, it will turn off after the floor gets hot, which is extremely inconvenient. .

Further, as shown in FIG. 4, a method of detecting only the heating panel temperature has been considered, but it has a drawback that it operates regardless of the room temperature. In addition, as shown in FIG. 4, the room temperature / floor temperature balance point moves due to the change in the outside air temperature, and the change in the temperature is felt by the user, and when the outside air temperature rises, the room temperature rises and becomes hot.

Further, a method for detecting room temperature and heating panel temperature has been proposed. This is when room temperature ≥ set value,
The heating panel setting value is kept constant and the panel setting value is increased when the room temperature <the setting value. This method is
Although it is a considerable improvement over the three methods, it still has many problems because it ignores the user's experience.

It is an object of the present invention to provide a control method capable of accurately producing a desired comfortable state even when there is a change in water temperature as well as a change in outside air.

[0007]

That is, according to the present invention, there is provided a floor heating panel and a method for controlling a floor heating device having a heat source device for supplying hot water to the floor heating panel through an opening / closing valve. A floor made by detecting one of the water return temperature and room temperature and synthesizing it to obtain a sensible temperature, controlling the heat radiation amount for floor heating based on the sensible temperature, and bringing this sensible temperature closer to the set isothermal temperature line. It is a control method of a heating device.

In the above, the heat radiation amount for floor heating may be controlled by changing the temperature of the heating water,
It is also possible to perform this by controlling the flow of heating water by opening and closing the valve.

[0009]

As described above, it is impossible to maintain the room temperature and the floor temperature at one point due to the characteristics of the floor heating, but the comfort for the user is obtained by the amount of movement on the isothermal temperature line. It is possible to control and observe by detecting the room temperature and another state quantity as the control target of this isothermal temperature line. And, even if the water temperature fluctuates, the desired comfortable condition can be accurately created.

In the present invention, the room temperature and the body sensation are linked,
Comfort is obtained by synthesizing the sensible temperature and controlling it so that it is placed on the target value on the isothermal temperature line. In this way, by being controlled by the sensible temperature, the room temperature / floor temperature balance point due to the change in the outside air temperature moves on the sensible temperature line, so that the user feels the same temperature. (See FIG. 2. In this respect, in the conventional example shown in FIGS. 3 and 4, the temperatures are not the same in terms of sensation and comfort cannot be obtained.)

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a floor heating system for supplying hot water by an on-off valve is a combustion system 1 in which a gas combustion section 2 is arranged below.
A pipe-shaped heat exchanger 3 is wound around the outer periphery of the, and a water distribution pipe 4 is connected to the heat exchanger 3, and this is guided to a floor heating panel 5. An on-off valve 6 composed of an electromagnetic valve and a circulation pump P are provided in the middle of the hot water pipe 4, and the on-off valve 6, the circulation pump P, a room temperature sensor 7 arranged in the room, and a gas valve 8 of the gas combustion unit 2 are controlled. It is connected to the device 9 and constitutes a floor heating device as a whole.

Next, the operation of this apparatus will be described. First, the hot water heat-exchanged in the pipe-shaped heat exchanger 3 by the combustion heating of the combustion apparatus 1 flows into the floor heating panel 5 through the hot water pipe 4 and is circulated. The floor heating panel 5 is warmed and the room is heated by the radiant heat to raise the room temperature.
In this case, the on-off valve 6 is opened and closed intermittently by repeating the on and off cycles so that the bed temperature does not fluctuate significantly. Up to this point, the configuration and operation are largely the same as in the conventional case.

Next, the control method according to the present invention will be described. First of all, it must be kept in mind that floor heating has its own limits. That is, when heating the room, the floor surface temperature is first raised in floor heating, and the temperature of the room air, walls, and ceiling is raised by radiation or convection from the floor surface. The amount of heat entering the room is determined comprehensively by the floor surface temperature, room temperature, wall surface temperature, etc. This is generally expressed as Q _in = Q _in (T _f , T _a , ...).
Here, T _f is the bed temperature and T _a is the room temperature.

The heat emitted from the room is determined by the indoor temperature and the outdoor temperature. This is Q _o = Q _o (T _f ,
T _a,. ． ． ). Therefore, it is impossible to keep the room temperature and the floor temperature at a designated point only by floor heating.

Next, based on the above, in addition to each of the above factors, "comfort" is considered when performing floor heating. When the room temperature and the floor temperature change, this comfort is plotted by plotting the points where humans feel comfortable according to the results of sensory experiments, and the line obtained by connecting the points (the ridge of the graph,
(Not shown).

From the above, the ridge of the comfort graph is regarded as the temperature of the body sensation and is set as the target (set value) of the floor heating control. If the room temperature and the floor temperature are made to move on the line of the above-mentioned isothermal temperature, it is considered that the user feels the same room temperature and the room temperature deviation is not a concern. Also, for floor heating, if the target can be assumed as a line instead of a point, control can be performed in the device.

In the present invention, attention is paid to the above-mentioned isothermal temperature, and there are a method of changing the heating water temperature and a method of intermittently passing the heating water by opening and closing a valve. To control.

(1) Method of changing heating water temperature: The heating water temperature is controlled by the difference between the sensible temperature and the set temperature. That is, when the sensed temperature> the set value, the water temperature is lowered.

When the sensible temperature = the set value, the water temperature is maintained as it is.

When the sensible temperature <the set value, the water temperature is increased.

As the water temperature control, PID control, step control or sampling control can be adopted.

(2) Method of intermittently passing heating water by opening / closing the valve: When the sensed temperature> the set value, the valve is closed to restrict the water flow.

When the sensible temperature <the set value, the valve is opened.

In addition to the above, when duty control is performed for opening and closing the valve, the sensible temperature is calculated using the average value of Tp and Tf during the cycle, and when the sensible temperature> the set value, the opening ratio of the valve is lowered.

When the sensible temperature <the set value, the opening rate of the valve is increased.

Although the accuracy is poor because the estimated factors (estimated bed temperature, etc.) increase, the valve opening / closing duty control and return water temperature detection are used in combination as a modification of the duty control for opening / closing the valve. Is also possible. In this case, the sensible temperature is calculated and controlled from the time when the return water temperature is high, the temperature at that time, and the room temperature.

[0028]

As described above, according to the present invention,
Comfort is obtained by linking the room temperature and the sensible feeling, synthesizing a sensational temperature, and controlling it so that it is placed on the target value on the isothermal sensation line. In this way, by being controlled by the sensible temperature, the room temperature / floor temperature balance point due to changes in the outside air temperature moves on the sensible temperature line, so that the user feels the same temperature, and not only the outside air fluctuations , It is possible to accurately create the desired comfortable condition even if the water temperature changes.

[Brief description of drawings]

FIG. 1 is a floor heating system 1 that can employ the control method of the present invention.
FIG. 6 is a schematic diagram of an example.

FIG. 2 is a graph showing a relationship between a sensible temperature and a change in outside air temperature in the control method of the present invention.

FIG. 3 is a graph showing the relationship between the sensible temperature and the change in the outside air temperature in the conventional control method.

FIG. 4 is a graph showing the relationship between the sensible temperature and the change in the outside air temperature in another conventional control method.

[Explanation of symbols]

 1 ... Combustion device 3 ... Heat exchanger 4 ... Hot water piping 5 ... Floor heating panel 6 ... Open / close valve 7 ... Room temperature sensor 9 ... Control device

Claims (3)

[Claims] 1. A method for controlling a floor heating apparatus having a floor heating panel and a heat source device for supplying hot water to the floor heating panel via an opening / closing valve, wherein one of floor temperature and heating water return temperature and room temperature Is detected and combined to obtain a sensible temperature, the radiant heat of floor heating is controlled by the sensible temperature, and the sensible temperature is approached to a set isothermal temperature line. 2. The method of claim 1, wherein the floor heating heat radiation amount is controlled by changing the temperature of the heating water. 3. The method according to claim 1, wherein the heat radiation amount for floor heating is performed by controlling the flow of heating water by opening and closing a valve.