JPH0546568B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for heating a floor in a regenerative floor heating system.

(Prior Art) A heat storage type floor heating system stores heat on the floor before a room is used, and when the room is used, the stored heat is released into the room to heat the room.

Since it takes time for heat storage type floor heating systems to store heat, it is usually necessary to predict how long it will take for the floor to reach a predetermined temperature (target temperature when heat storage is completed), and then calculate the temperature of the room. The power is turned on to the heater buried in the floor for the predicted time before the start of use, and the heating begins, thereby storing heat in the floor.

Heat storage floor heating systems usually operate during late-night hours (usually 11 p.m. to 7 a.m.) when electricity costs are low.
8 hours) to complete heat storage by heating the floor,
Since the accumulated heat is released to heat the room when it is used, temperature control is not possible from day to night.

Therefore, the temperature of the room heated by the heat storage type floor heating system is determined by the floor temperature where the heat is stored, that is, the temperature at the time the heat storage is completed (heating is started). Therefore, the temperature at the start of heating is the highest, and thereafter, as the floor temperature in which heat has been stored falls, the room temperature gradually decreases.

Conventionally, the floor temperature when the heat storage is completed is set in advance, and a timer is used to turn on the power so that the set floor temperature is reached when the heat storage is completed.
It was turned off and power was being applied to the floor heater.

However, the heating period is generally a long period of 4 to 6 months or more, during which the climate changes from late autumn to early winter, and from severe winter to early spring. Therefore, in order to provide comfortable heating, it is necessary to readjust the set value of the floor temperature at the end of heat storage every month or once or twice a season depending on the climate. In this case, the floor temperature upon completion of heat storage is generally set based on standard thermal calculations or based on empirical values from heating operations over the past several years.

However, the climatic conditions during actual heating operation are usually different from past experience values, so in order to achieve comfortable heating, the temperature of the floor where heat is stored must be changed in a timely manner. However, it is generally difficult to adjust the floor temperature on a daily basis, so the stored heat floor temperature may be too high, causing overheating in the room, or the stored heat floor temperature may be too low, resulting in insufficient heating in the room. There were many.

In the case of overheating, the energy used to heat the floor during heat storage is wasted, which is uneconomical; in the case of underheating, there is no waste of energy during heat storage, but the room must endure the cold.

Conventionally, in order to avoid the trouble of changing the floor temperature setting every day and to prevent insufficient heating, the floor heating temperature is usually set at a high level. Therefore, the power consumption for heating the floor increased, which was uneconomical.

In addition, the temperature increase characteristics and temperature increase time of floor heating are affected by the outside temperature, so it is difficult to obtain comfortable thermal storage heating by controlling the floor heating temperature by measuring only the indoor temperature. Conventionally, it has been considered to measure the outside temperature instantaneously during heating and change the heating temperature of the floor based on the measurement results.

(Problems with conventional technology) However, with heat storage type floor heating systems, it takes time for the temperature to change (usually it takes about 1 hour to raise the temperature by 0.5 to 1.0 degrees Celsius), so every time the outside temperature changes, the floor heating system Even if the set value of the heating temperature is changed, the bed temperature cannot completely follow the change, and there is a time delay until the set temperature is reached. This problem is more pronounced in underfloor heating systems with larger heat storage capacities.

(Objective of the Invention) The object of the present invention is to utilize data on the climate and outside air temperature before (past) heating, supplement that data with the outside air temperature the day before or a few days before the actual heat storage day. In addition to predicting the climate and outside temperature during indoor heating, it is also possible to store heat in the floor so that optimal heating can be obtained every day even if the climate and outside temperature change during indoor heating, and there is no waste of energy used to store heat in the floor. An object of the present invention is to provide a method for heating a floor in a heat storage floor heating system, which can reduce running costs by reducing the heating.

(Means for Solving the Problems) In order to achieve the above-mentioned object of the present invention, the following knowledge was obtained as a result of various studies on heat storage type floor heating systems.

It is desirable to determine the heat storage temperature (floor temperature = set value) upon completion of heat storage based on the outside temperature data most recent to the start of heat storage. In general, with thermal storage heating, the heat capacity of the entire room is very large, so the effect of sudden temperature changes (such as a cold morning on a single day) is not noticeable. For this reason, the idea that the heat radiated from the previous day is stored in the next night is almost valid. In this case, the amount of heat released on the previous day is approximately proportional to the temperature on the previous day, especially the temperature from the start of heat release (= time of completion of heat storage = morning) to the start of heat storage on that day. It is effective to use outside air temperature data up to the start of heat storage (a certain time period immediately before the start of energization).

Therefore, as described above, the present invention not only sets the set value of the floor temperature at the time of completion of heat storage based on the experience value of heating operation over the past several years, but also sets the set value of the floor temperature at the time of completion of heat storage based on the experience value of heating operation over the past several years. This setting is supplemented by outside air temperature data for a certain time period.

That is, the floor heating method in the heat storage type floor heating system of the present invention was developed based on the above knowledge, and measures the past outside air temperature at appropriate time intervals within a specific time, and calculates the measured temperature value. is accumulated at each measurement time, and the relationship between the accumulated value and the outdoor temperature mode (Figure 2) is classified into several types of outdoor temperature data, each outdoor temperature mode, and the optimal floor temperature for each outdoor temperature mode. Prepare floor temperature data classified into several different relationships, and use the same conditions as the past outside temperature detection conditions described above to determine the outside temperature at a certain time when electricity is started for heat storage in the floor heating system. Measure the temperature, store the measured temperature as a temperature value in the temperature memory, integrate the recorded temperature values, determine the outside temperature mode based on the integrated value and the above-mentioned past outside temperature data, and select the outside temperature mode. The floor temperature at the end of heating in the outside temperature mode is determined from the above-mentioned past floor temperature data, and the floor heating system is energized for heat storage according to the floor temperature. be.

(Operation of the Invention) The method for heating the floor in the regenerative floor heating system of the present invention before the start of indoor use is as follows.

The outside air temperature sensor 4 shown in FIG. Measure outside temperature. This measurement is performed every time a specific periodic signal is transmitted from the timer circuit 6.

The measured outside temperature is converted from analog to digital by the A/D conversion circuit 7 and stored in temperature memory (RAM).
3 ₁ to 3n. This memory 3 ₁ to 3n is
It is possible to store 240 pieces of data (one day's worth of data once every 6 minutes), and when new data is input from the outside temperature detection unit 7 while 240 pieces of data are stored, the data will be stored one after another. The oldest data is shifted and discarded.

The 240 pieces of data stored in the temperature memories 3 ₁ to 3n are integrated in the arithmetic circuit 8 every time new data is added, and the integrated value is sent to the outside air temperature mode determining section 9.

This integrated value is compared with past outside temperature data (Figs. 2 and 3) stored in the outside temperature memory 1, and it is determined which outside temperature mode it corresponds to.
The determined outside air temperature mode is output. In this case, to determine which outside temperature mode it corresponds to, use the integrated value as the lower limit of the integrated value in outside temperature memory 1 (Figure 2).
Compare with. For example, if the integrated value is 1800, it is determined that the outside temperature mode is A.

The output outside temperature mode A is sent to the floor temperature determination circuit 1.
0, and is compared with past floor temperature data (relationship between outside air temperature mode and optimal bed temperature) stored in the floor temperature memory 2, and the optimal bed temperature for that outside air temperature mode A is determined. , the temperature at the completion of heat storage in the floor is determined.

Based on the determined optimal bed temperature, the heat storage conditions of the bed temperature controller 11, such as the start time of energizing the heater for heat storage, the temperature of the floor when heat storage is completed (heat storage temperature), etc. are automatically set. The heating temperature of the bed is automatically controlled based on the setting, and the bed is heated to the set heat storage temperature when heat storage is completed.

It should be noted that each block in FIGS. 1 and 2 operates according to instructions from the timer circuit 6.

Further, as described above, the 240 pieces of data stored in the temperature memories ₃₁ to 3n are integrated in the arithmetic circuit 8 every time new data is added, and the integrated value is sent to the outside air temperature mode determination section 9. Therefore, the outside temperature mode is always determined based on this new data, and furthermore, the optimal bed temperature is determined based on the floor temperature data corresponding to this latest outside temperature mode. Therefore, the floor is heated based on the most recent outside temperature data before the start of electricity supply to the floor heating device for heat storage.

(Embodiment of the Invention) FIG. 1 shows an embodiment of a method for heating a floor in a regenerative floor heating system of the present invention. 12 in Figure 1
An outside air temperature detection section is composed of an outside air temperature sensor 4, a temperature measurement circuit 5, and an A/D converter 7.

This outside air temperature detection unit 12 measures the outside air temperature when a signal is sent from the timer circuit 6 at appropriate time intervals at a certain period (for example, every 6 minutes) within a specific time (for example, 24 hours before the start of heat storage). Then, the measured temperature values are integrated at each measurement time, and each integrated value is integrated by the arithmetic circuit 8. As shown in FIG.
It is classified into the outside temperature mode of ~E. The measured outside temperature is converted into analog/digital data by the A/D conversion circuit 7.
The data are digitally converted and stored in the temperature memories 3 ₁ to 3n.

For example, the temperature memories 3 ₁ to 3n in FIG.
is used. The temperature memories 3 ₁ to 3n have a large storage capacity, and are designed so that new information input in synchronization with the periodic signal from the timer circuit 6 is sequentially stored, and old information is discarded.

Figure 1 shows 8 arithmetic circuits, which are memory 3
Each time new information is stored in ₁ to 3n, the information is integrated and sent to the outside temperature mode determining section 9.

FIG. 1 shows an outside temperature memory 1, which stores the relationship between the outside temperature mode and the lower limit value of the integrated value as shown in FIG. This data measures past outdoor temperatures at appropriate time intervals within a specific time,
The measured temperature value is integrated at each measurement time, and the relationship between the integrated value and the outside temperature mode is shown in Figure 2, for example, A.
-E are classified into several outside temperature modes. The outside temperature mode in FIG. 2 is divided into five ranks A to E, and when the total value is large, that is, when the climate is generally high, it is determined to be a high rank, and when it is low, it is determined to be a low rank.

2 in Figure 1 is a floor temperature memory, which contains the outside temperature modes of ranks A to E in Figure 2 and the optimal floor temperature (floor heating temperature) for each of those outside temperature modes. (Fig. 5) are classified and stored in several ways.

FIG. 1 shows an outside temperature mode determination section 9, which compares the integrated value accumulated by the arithmetic circuit 8 with the lower limit value of the integrated value stored in the outside temperature data memory 1 shown in FIG. , it is determined to which outside temperature mode the integrated value integrated by the arithmetic circuit 8 corresponds.

Reference numeral 10 in FIG. 1 is a floor temperature determination circuit, which determines the outside temperature by comparing the new outside temperature mode input from the outside temperature mode determination section 9 and the floor temperature data stored in the floor temperature memory 2. This is to determine the optimum bed temperature (optimum bed heating temperature) corresponding to the mode.

Reference numeral 11 in FIG. 1 is a floor temperature controller, which automatically adjusts the heat storage start time, heat storage temperature at the end of heat storage (floor temperature immediately before use), etc. based on the data output from the floor temperature determination circuit 10. The heating temperature of the bed is automatically controlled based on this setting, and the bed is heated to the set heating temperature when heat storage is completed.

(Experimental Example) FIGS. 5 and 6 are explanations of the case where the floor heating in the regenerative floor heating system of the present invention is performed using late-night electricity.

Figure 5 is an example of an experiment conducted in October, where the outside air temperature remains low (10 degrees Celsius or less). Fifth
The figure shows the change in room temperature when the system is operated at the floor temperature set value (floor heating temperature) determined based on the outside temperature data obtained by measuring the outside temperature.
Since the outside temperature is not so low in October, once the floor temperature is raised to the set floor temperature during the late-night charge period, the stored heat will heat the room for 48 hours.
There was no need to heat the floor during that time.

Figure 6 shows an example of the experiment in February. Although the room temperature during the usage period of the room is almost the same as in the case shown in FIG. 5, the transition of the floor temperature is different from that shown in FIG. 6. That is, it can be seen that by selecting the optimal heating value for the floor temperature, stable indoor conditions can be maintained during different periods of climate.

(Effects of the Invention) The floor heating method in the heat storage type floor heating system of the present invention has the following effects.

(1) Using data such as past climate conditions and outside air temperature, and also taking into account the most recent climate and outside air temperature before the start of heat storage, the temperature at the end of floor heating (floor temperature at the start of room heating) Since the system determines the temperature and stores heat in the floor based on the determination, fully automatic floor heating is possible that corresponds to external dynamics such as the climate and outside temperature during the heating period. This reduces overheating and underheating, making it possible to provide comfortable floor heating.

(2) Fully automatic floor heating that adapts to the climate and outside temperature dynamics during the heating period is possible, so there is almost no wastage of energy (electricity) used for heat storage.
This contributes to energy conservation and significantly reduces running costs.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the floor heating method of the present invention, Figure 2
The figure is a detailed explanatory diagram of Figure 1, Figure 3 is an explanatory diagram showing the relationship between the integrated value of outside air temperature and the outside temperature mode by the heating method of the present invention, and Figure 4 is an explanatory diagram showing the relationship between the outside air temperature mode and the optimal bed temperature. Explanatory diagrams showing the relationship, FIGS. 5 and 6, are explanatory diagrams of experimental examples of the heating method of the present invention. 1 is outside temperature memory, 2 is floor temperature memory, 3a~
3n is temperature memory.

Claims (1)

[Claims] 1 Outside temperature data in which past outside air temperatures are measured at appropriate time intervals within a specific time, the measured temperature values are integrated at each measurement time, and the relationship between the integrated values and the outside temperature mode is classified into several ways. and floor temperature data that classify the relationship between each outside temperature mode and the optimal floor temperature for each outside temperature mode into several ways.
The outside air temperature during a certain time period before the start of energization for heat storage of the floor heating system is measured under the same conditions as the past outside air temperature detection conditions described above, and the measured temperature is stored in a temperature memory as a temperature value. The outside temperature mode is determined based on the integrated value and the above-mentioned past outside temperature data, and the heat storage in that outside temperature mode is determined from the outside temperature mode and the above-mentioned past floor temperature data. Determine the bed temperature at the end,
A method for heating a floor in a heat storage type floor heating system, characterized in that the floor heating device is energized for heat storage according to the floor temperature.