JP2012013240A - Under-floor heat-storage type heating-system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an under-floor heat-storage type heating-system capable of supplying such calorific value as considers heat radiation from a mat-foundation lower part and from a rising part of the foundation.SOLUTION: A hot-water pipe 21 is laid in a floor concrete 13 of a house 1. A thermal medium is circulated to the hot-water pipe 21 from a heat pump unit 22 which is a heat source, to cause the floor concrete 13 to accumulate heat, so that the indoor of the house 1 is heated. Here, the hot-water pipe 21 is laid in such a manner that its height from the lower surface of the floor concrete 13 is within the range of 0.3-0.5 relative to the thickness of the floor concrete 13, with a buried volume being 0.30-0.40% of the volume of the floor concrete 13.

Description

  The present invention relates to an underfloor regenerative heating system that heats a room by guiding a heat medium such as hot water generated by a heat exchanger such as a heat pump to a pipe laid in the foundation of a building such as a house, and more particularly, a house or the like. The present invention relates to an underfloor regenerative heating system that enhances the heat storage effect by optimizing the arrangement of piping laid in the foundation of a building.

  When heating a room, the simplest method is to use a heating device such as a stove. However, when such a device is used, the user needs to pay attention to regular ventilation and fire prevention. For example, if a stove is used in a room that is closed for a long time, there is a risk of lack of oxygen. However, opening windows and doors for ventilation is not preferable from the viewpoint of heating efficiency because the warm air is expelled from the room. In addition, since the stove and the like burn, it is necessary to consider the surroundings so that the curtains and the laundry are not accidentally ignited. A sheathed heater type underfloor heat storage heating system and a heat pump type floor heating system are known as devices that eliminate such necessity and can be used safely.

  In addition, as a related system, an air conditioning unit is installed on the ceiling in the room, and the indoor temperature is controlled by air conditioning from both the ceiling and the floor via piping embedded in the concrete as a heat storage material placed under the floor. An air conditioner with reduced unevenness (Patent Document 1), using soil concrete under the floor as a heat storage body, and passing hot / cold water heated / cooled with a heat pump through a pipe installed in the soil concrete, for indoor floor heating / cooling When performing air conditioning indoors by supplying cold water / warm water from a heat pump chiller to a vip installed on the floor, a temperature sensor is installed in each of the outdoor and floor heat storage bodies, and the target heat storage amount Determine the temperature of the heat medium that circulates inside the heat storage body and the heat storage time for the heat medium to circulate inside the heat storage body. And the like heat storage air conditioning system which is adapted to control (Patent Document 3) by.

JP-A-2-21143 JP-A-9-324933 JP 2001-263762 A

  However, in the case of the above-described sheathed heater type underfloor heat storage and heating system, it is possible to keep the electricity bill low by using cheap power at night, but it is not energy saving because of the large amount of power consumption. Moreover, although the heat pump type floor heating system mentioned above is energy saving, since it is not a heat storage type, it uses electric power in the daytime, so the electricity bill is not so cheap. Furthermore, in the various conventional underfloor heat storage type devices and systems described above, the technology related to the construction of the system including the path of each device and the heat medium has progressed, but there are problems on the housing side of buildings such as houses. Has not been studied much and there is room for improvement. For example, when using a concrete foundation of a house as a heat storage material, the entire concrete foundation can be efficiently used as a heat storage material if heat is distributed to the entire concrete as much as possible. In addition, there are problems to be further studied in order to efficiently use the concrete foundation as a heat storage material, such as the relationship between the concrete foundation and the piping for circulating the heat medium.

  Therefore, the present invention has been made in view of such problems, and when a concrete foundation of a building such as a house is used as a heat storage medium, the entire concrete foundation can be efficiently used as a heat storage material. An object is to provide an underfloor regenerative heating system.

  In order to solve the above-mentioned problem, the invention according to claim 1 is arranged such that a pipe is laid in the soil concrete constructed under the floor of the indoor space of the building having the indoor space to be heated, and the heat source is provided via the pipe. In an underfloor regenerative heating system that heats indoor concrete space by circulating a heated heat medium to heat and store the soil concrete, the pipe has a height from the bottom surface of the soil concrete. It is characterized by being laid within a range of 0.3 to 0.5 with respect to the thickness of the concrete and with an embedded volume of 0.30 to 0.40% of the volume of the soil concrete.

  In order to solve the above-mentioned problem, the present invention according to claim 2 is the underfloor regenerative heating system according to claim 1, wherein the pipe has an inner diameter of 10 mm to 20 mm, and the interval between the parallel pipes is set to a pitch of 100 mm to 200 mm. It is characterized by having been arranged in.

  In order to solve the above problem, the present invention according to claim 3 is the underfloor regenerative heating system according to claim 1 or 2, wherein the thickness of the soil concrete is 150 to 250 mm.

  In order to solve the above-mentioned problem, the present invention according to claim 4 is characterized in that in the underfloor regenerative heating system according to any one of claims 1 to 3, the heat source is a heat pump.

  According to the underfloor regenerative heating system according to the present invention, the entire soil concrete is effectively used as a heat storage material by optimally arranging the piping for circulating the heat medium in the soil concrete that forms the foundation of a building such as a house. There is an effect that an underfloor regenerative heating system that can be used can be provided, and efficient floor heating can be provided.

It is a perspective view which shows the house in which one Embodiment of the underfloor thermal storage heating system which concerns on this invention was installed. It is a systematic diagram which shows the connection of each part of the underfloor thermal storage heating system which concerns on this invention. It is sectional drawing which shows the relationship between the thickness of soil concrete, and the height position of a hot water pipe. It is a characteristic view which shows the temperature distribution of soil concrete. It is a graph which shows the influence by the difference in the pitch of a warm water pipe. It is sectional drawing of the soil concrete which shows the height position of piping. It is a graph which shows the relationship between room temperature in a field test place (Iitoyo), operation time, and electric power. It is a graph which shows the annual power consumption about a heat pump type | formula heat storage heating, a heat storage type electric heater, and an electric heat type heat storage heating.

Hereinafter, an underfloor regenerative heating system according to the present invention will be described in detail with reference to the drawings based on a preferred embodiment.
[Configuration of residential and underfloor regenerative heating system]
FIG. 1 is a perspective view (partially shown in a sectional view) of a house in which an embodiment of an underfloor regenerative heating system according to the present invention is installed. The illustrated house 1 is a wooden detached house, and generally includes a so-called solid foundation 11 made of reinforced concrete. The solid foundation 11 is provided with soil concrete 13 placed with a predetermined thickness across the heat insulating material 12 laid on the upper surface side of the flat surface portion, and its edge portion is formed slightly higher than the flat surface portion. The heat insulating material 12 is laid vertically along the inside of this highly formed edge.

  A predetermined number of floor bundles (yukaka) 14 are erected at predetermined positions on the soil-concrete 13, and the required number of large bundles (o (Obiki) 15, a required number of joists 16 arranged horizontally on the plurality of large forks 15 and perpendicular to the large forks 15, and installed on the joists 16 via a floor base 17. The flooring material 18 is provided. Therefore, an underfloor space exists between the soil concrete 13 and the floor foundation 17. Note that a louver 28 serving as an underfloor ventilation opening is provided on the wall of the flooring material 18. In addition, an air conditioner indoor unit 27 is attached to an indoor wall as necessary.

[Configuration of underfloor regenerative heating system]
FIG. 2 is a system diagram showing connection of each part of the underfloor regenerative heating system. As shown in FIGS. 1 and 2, the underfloor regenerative heating system 2 installed in the house 1 is generally composed of a hot water pipe 21 laid so as to meander in the soil concrete 13 in a predetermined pattern, A heat pump unit 22 as a heat source for circulating hot water through the pipe 21, a controller 23 connected to the heat pump unit 22 and installed on the wall surface of the room to control the heat pump unit 22, one end of the hot water pipe 21, and the heat pump unit 22 And a plurality of pipes (a pipe 25a connecting the hot water supply port of the heat pump unit 22 and one end of the hot water pipe 21, and a hot water return of the heat pump unit 22). Piping 25b connecting the mouth and the radiator 24, piping 25 connecting the other end of the hot water pipe 21 and the radiator 24 ), A temperature sensor 26 (not shown in FIG. 1) that is installed in the soil concrete 13 and detects the temperature in the soil concrete 13, and is connected to the heat pump unit 22 as necessary and is shown in FIG. The air conditioner indoor unit 27 is attached to the wall of the room and heated from the indoor side together with floor heating. The radiator 24 is used for efficiently operating the heat pump 22 by lowering the temperature of the return hot water, and may be configured not to be particularly provided.

  The hot water pipe 21 is a pipe having a diameter (for example, 10 to 20 mmφ) that matches the diameter of the hot water outlet and the return opening of the heat pump unit 22. The material of the hot water pipe 21 in this embodiment is a cross-linked polyethylene pipe, and is laid before the soil concrete 13 is poured. The material of the hot water pipe 21 is not limited to cross-linked polyethylene, but the cross-linked polyethylene is not worried about rust, has excellent cold resistance and heat resistance, is light and flexible, and is suitable for piping construction. There are advantages. The pipe pitch P (the interval between adjacent hot water pipes 21, see FIG. 3) is preferably set to 100 mm to 200 mm, for example. This is because if the piping pitch P is too narrow, the deformation of the bent portion of the hot water pipe 21 and the thermal efficiency deteriorate, and conversely if it is too wide, the soil concrete 13 cannot sufficiently store heat. The controller 23 controls the heat pump unit 22 with a microcomputer and a program, and includes a power switch, various setting buttons, a liquid crystal display, and the like.

  As the heat pump unit 22, a general commercial product can be used. The heat pump unit 22 used in the present embodiment operates with a single-phase 200 V power source and has specifications that can be used as an outdoor unit of an air conditioner. The heat pump unit 22 includes an air heat exchanger (evaporator) that collects heat from the atmosphere, a compressor (compressor) connected in series to the air heat exchanger, a water heat exchanger (condenser), an expansion valve, and the like. The medium (hot water) is circulated through the air heat exchanger, the compressor, and the water heat exchanger, and the hot water generated by the water heat exchanger is circulated through the hot water pipe 21.

4 is a characteristic diagram showing the temperature distribution of the soil concrete, and FIG. 6 is a cross-sectional view of the soil concrete showing the height position of the pipe. The hot water pipe 21 with a pitch P of 100 mm is arranged at a position 85 mm from the surface of the heat insulating material 12, and the hot water pipe 21 with a pitch P of 200 mm is arranged at a position 150 mm from the surface of the heat insulating material 12, and the temperature level (temperature For the measurement position, twelve locations (L1 to L12) shown in FIG. 6 were set, and this was taken as the horizontal axis in FIG. Each position is as follows.
L1 (0 mm): heat insulating material surface L2 (30 mm): pitch 100 (mm) intermediate between pipe 21 and heat insulating material L3 (85 mm): pitch 100 (mm) surface of pipe 21 L4 (120 mm): pitch 100 (mm) Between pipe 21 and 200 (mm) pipe 21 L5 (150 mm): Pitch 200 (mm) surface of pipe 21 L6 (190 mm): Pitch 200 (mm) Between pipe 21 and concrete surface L7 (230 mm): Between soil Concrete surface L8: Underfloor air layer L9: Flooring material back surface L10: Inside the garage L11: Flooring material surface L12: Room temperature

  As shown in FIG. 4, when the pipe pitch P of the hot water pipe 21 is 100 mm, the temperature rises at a level close to the surface of the heat insulating material 12 (L1 in FIG. 5) is large, and when the pitch P is 200 mm, it is close to the soil surface. The temperature rise increases at the level (L6 to L7 in FIG. 5). However, it is considered that the difference in temperature distribution shown in FIG. 4 is not due to the difference in pitch P but rather due to the difference in the buried position (height) of the hot water pipe 21. This is because, as shown in FIG. 5, it is considered that the difference in pitch P does not affect the temperature distribution. That is, FIG. 5 shows that the thickness of the soil concrete 13 is 210 mm, the hot water pipe 21 is embedded at a position 61.5 mm from the surface of the heat insulating material 12, and the pitch P is 100 mm and 200 mm, respectively. Although it is a graph which shows the result of having measured the temperature of a position (the height of 105 mm from the lower surface of soil concrete 13), and performing the comparison, as shown in the figure, the case where pitch P is 100 mm, and the case of 200 mm Then, it can be seen that there is almost no difference in temperature rise over time.

  As shown in FIG. 4, when the pitch P is 200 mm, the temperature of L1 (insulating material surface) is lower than the temperature of L4 (height of 120 mm from the lower surface of the soil concrete 13), and the lower side of the soil concrete 13 is It is not fully utilized as a heat storage material. On the other hand, in the case where the pitch P is 100 mm, the temperature of L1 (insulating material surface) is higher than that in the case where the pitch P is 200 mm, and the lower side of the soil concrete 13 is sufficiently utilized as a heat storage material. I understand that. Thus, if the hot water pipe 21 is embedded at a position close to the upper surface of the interstitial concrete 13, heat radiation from the surface of the interstitial concrete 13 increases, and the lower side of the interstitial concrete 13 is not sufficiently heated. Therefore, it is preferable that the height position where the hot water pipe 21 is embedded is embedded at least on the side closer to the surface of the heat insulating material than the central part of the thickness of the interstitial concrete 13 (lower than the central part). Specifically, as shown in Examples (Table 1) to be described later, the height position at which the hot water pipe 21 is embedded is 0.308 to 0.00 from the surface of the soil concrete 13 to the thickness of the soil concrete 13. It is preferable to embed within a range of 465 height. Thereby, it becomes possible to effectively use the entire soil concrete 13 as a heat storage material. In many solid foundations of ordinary houses, the thickness of the soil concrete 13 is generally 150 mm to 250 mm.

  In addition, when the hot water pipe 21 having an excessively large inner diameter is used, not only the strength of the interstitial concrete 13 may be reduced, but also the amount of warm water to be circulated increases and the efficiency of heat exchange with the interstitial concrete 13 is deteriorated. It is preferable to use one having an inner diameter of 10 mm to 20 mm.

[Operation of underfloor regenerative heating system]
Next, operation | movement of the underfloor thermal storage heating system mentioned above is demonstrated. The underfloor regenerative heating system 2 is installed as shown in FIG. 1 when the house 1 is newly constructed or renovated. 1 and 2, when the user wants to perform floor heating, the user operates the controller 23 to start the operation of the heat pump unit 22. The heat pump unit 22 absorbs atmospheric heat with the built-in air heat exchanger and raises the temperature of the refrigerant flowing through the air heat exchanger (for example, from about −3 ° C. to about 2 ° C.). It compresses with a compressor, heats to about 105 degreeC, sends it to a water heat exchanger, and makes the temperature of the warm water which flows into the hot water pipe 21 into 45-55 degreeC, for example. Furthermore, the refrigerant (about 55 ° C.) discharged from the water heat exchanger is supplied to the expansion valve to be lowered to about 2 ° C., and this is supplied to the air heat exchanger. The heat pump unit 22 repeatedly executes the above operation. As a result, the soil concrete 13 and the space above it are warmed by the hot water circulating through the hot water pipe 21 and further transferred to the flooring material 18 so that the interior of the house 1 has a constant temperature (for example, around 20 ° C., 25 ° C. It is heated at the front and rear etc. Then, the operation of the heat pump unit 22 is performed using low-cost nighttime electric power, whereby the electric power charge can be reduced (saved).

[Effect of the embodiment]
According to the underfloor heat storage type heating system according to the present embodiment, the hot water pipe 21 can be optimally arranged based on the buried position of the hot water pipe 21 and the buried volume ratio of the hot water pipe 21 with respect to the volume of the soil concrete 13. The entire soil concrete 13 can be efficiently used as a heat storage material, and there is an effect that floor heating can be performed efficiently.
In addition, even when the room temperature is lowered by connecting the indoor unit to the heat pump unit 22, the indoor unit is operated by operating the indoor unit while securing the base heating at around 20 ° C. with the soil concrete 13 than when there is no indoor unit. There is an effect that a comfortable temperature environment can be maintained by raising the room temperature.

  The inventors actually performed field tests in different locations and different floor areas in four houses. The implementation data is shown in Table 1. The test place in Table 1 is the place where the house was constructed. In addition, the buried height of the hot water pipe 21 was buried at a position of 61.5 mm (93.0 mm for Iitoyo) from the lower surface of the soil, and the pitch P was all set to 100 mm.

Table 1 shows the length of the hot water pipe 21 in each house, the volume of the hot water pipe 21, the volume of the soil concrete 13, the buried height and height ratio of the hot water pipe 21, and the volume of the hot water pipe 21 and the soil concrete 13. The volume ratio is shown. The diameters of the hot water tubes 21 used are all 10 mmφ (the cross-sectional area is 0.0000785.5 m ² ). The pipe embedment height ratio in Table 1 is a ratio between the embedment height of the hot water pipe 21 and the thickness of the soil concrete 13. The volume ratio is the volume obtained by multiplying the length of the hot water pipe 21 by the cross-sectional area of the hot water pipe 21 (for example, if the field test place is “Naruko”, 204 m × 0.0000785.5 mm ² = 0.0160 m ³ The volume of the hot water pipe 21) and the volume of the soil concrete 13 (6.4 m ³ ([laying area of the hot water pipe 21] 30.6 m ² × [thickness of the soil concrete 13] 210 mm)) The volume ratio of the hot water pipe 21 is 0.0025 (= 0.25%).

  Table 2 shows the results of average outside air temperature, average room temperature, and average soil concrete temperature in each house shown in Table 1.

  Room temperature exceeding an average of about 20 ° C. could be secured at other field test locations except Naruko. Here, the buried height of the hot water pipe 21 in Naruko is 61.5 mm from the lower surface of the interstitial concrete 13 and the pitch P is 100 mm, which is almost the same as in other field test places. The volume ratio of the volume to the volume of the soil concrete 13 is 0.25%, and since the buried volume of the hot water pipe 21 is smaller than that of other field test places, the average room temperature is around 20 ° C. at other field test places. On the other hand, it is considered that the result was lower than around 16 ° C. Therefore, from Table 1 and Table 2, it is preferable to arrange the buried height of the hot water pipe 21 within a range where the height ratio to the thickness of the soil concrete 13 is 0.3 to 0.5. Moreover, it is preferable that the volume ratio of the hot water pipe 21 is 0.30 to 0.40%. In addition, while showing the graph which shows the relationship between the room temperature, operation time, and electric power about the field test in Iitoyo in FIG. 7, in FIG. 8, about the heat pump type | formula heat storage heating, the heat storage type electric heater, and the electric heat type basic heat storage heating in Iitoyo The comparison of annual power consumption is shown. Note that the difference between the electric power 1 and the electric power 2 in FIG. 7 is due to the difference in the type of heat pump. As shown in FIG. 7, it can be seen that even when the outside air temperature decreases, the fluctuation of the room temperature is small, and the room temperature is stably maintained at about 20 to 23 ° C. for 24 hours. Moreover, as shown in FIG. 8, the heat pump basic heat storage heating system has less annual power consumption than the heat storage electric heater and electric heat basic heat storage heating, and is more energy saving.

  Thus, according to the underfloor heat storage type heating system according to the present invention, the entire height of the soil concrete 13 is used as a heat storage material by optimizing the buried height of the hot water pipe 21 and the volume ratio of the soil concrete 13 and the hot water pipe 21. There is an effect that heating can be performed efficiently.

  As mentioned above, although each preferred embodiment was described, the underfloor regenerative heating system according to the present invention is a underfloor regenerative heating system employed in a building other than a house, for example, a building such as an office or a store. Furthermore, it can also be employed in heating systems for greenhouses such as vegetable cultivation and zoo breeding grounds.

DESCRIPTION OF SYMBOLS 1 House 2 Underfloor regenerative heating system 10 Floor 11 Solid foundation 12 Heat insulating material 12 Hot water pipe 13 Drum between concrete 14 Floor bundle 15 Large drawing 16 joist 17 Floor foundation 18 Flooring material 21 Hot water pipe 22 Heat pump unit 23 Controller 24 Radiator 25a Pipe 25b Piping 25c Piping 26 Temperature sensor

Claims (4)

A pipe is laid in the soil concrete constructed under the floor of the indoor space of the building having the indoor space to be heated, and the heat medium heated by a heat source is circulated through the pipe to add the soil concrete. In the underfloor regenerative heating system that heats the indoor space of the building by warming and storing heat,
The pipe has a height from the lower surface of the soil concrete within a range of 0.3 to 0.5 with respect to the thickness of the soil concrete, and an embedded volume is 0.30 to the volume of the soil concrete. Underfloor regenerative heating system, which is installed at 0.40%. In the underfloor regenerative heating system according to claim 1,
The pipe has an inner diameter of 10 mm to 20 mm, and an interval between the pipes arranged in parallel is arranged at a pitch of 100 mm to 200 mm. In the underfloor regenerative heating system according to claim 1 or 2,
The underfloor regenerative heating system, wherein the soil concrete has a thickness of 150 to 250 mm. In the underfloor regenerative heating system according to any one of claims 1 to 3,
The underfloor regenerative heating system, wherein the heat source is a heat pump.

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