JP2007051859A - Underfloor heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively improve heat efficiency without large increase in cost in application of an air convection type underfloor heating system to a foundation heat-insulated dwelling house. <P>SOLUTION: This underfloor heating system S1 for the foundation heat-insulated dwelling house with an underfloor closed space is adapted to heat an indoor space on a floor by setting a heat pump air conditioner 2 including a hot air blowing duct 21 in an underfloor space 10, and moving hot air blown through an outlet port 22 of the duct 21 in a convective manner within the underfloor space 10. In this system S1, a heat insulating plate 4 is locally laid on the surface of a dirt floor concrete 102 located in the vicinity of the hot air outlet port 22 of the duct 21. According to this, outflow of the heat of the blown hot air to the ground is regulated, whereby the energy efficiency of the heat pump air conditioner 2 is improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an underfloor heating system for heating an indoor space on a floor by convection of warm air in the underfloor space in a basic heat insulating house with the underfloor as a closed space.

  Generally, in a house in a relatively warm area, an underfloor heat insulation method in which a ventilation opening is provided under the floor to open the underfloor space is employed. However, in a floor-insulated house, there is a risk that high-temperature and high-humidity air will intrude under the floor in a low-temperature environment in the summer, causing dew condensation under the floor and shortening the housing life. For this reason, highly insulated and airtight houses that have been adopted exclusively in cold regions, that is, basic insulated houses with closed floors by closing the underfloor vents of the houses and insulating the underfloor outer periphery, even in warm regions It is being adopted.

On the other hand, in such a basic heat insulating house, for example, as disclosed in Patent Document 1, a radiator is installed in a closed underfloor space, and the indoor space on the floor is heated by heating the underfloor space. Underfloor heating systems are known. As such an underfloor heating system, an air convection system that uses a heat pump air conditioner (heating equipment) equipped with a hot air blowing duct and convects the hot air blown from the duct to the underfloor space is a facility scale, cost, and safety. It is attracting attention because of its superiority.
JP 2001-201075 A

  In the case of employing an underfloor heating system, in order to improve the thermal efficiency, it is indispensable to suppress the heat outflow to the soil concrete (ground) as much as possible. This also applies to the case where the above-described air convection type underfloor heating system is employed, but it is required to take an optimum measure for improving thermal efficiency in accordance with an aspect in which hot air is blown out from the duct.

  However, when applying an air convection type underfloor heating system to a basic heat insulating house, there is currently no specific proposal for effectively improving thermal efficiency without increasing the cost.

  An underfloor heating system according to the present invention is an underfloor heating system in a basic heat insulating house with the underfloor as a closed space, in which heating equipment including a hot air blowing duct is installed in the underfloor space and blown out from the duct. In the underfloor heating system configured to heat the indoor space above the floor by convection of the hot air to the underfloor space, the blown hot air is blown to the soil surface located near the hot air outlet of the duct. It is characterized by locally laying a heat insulating plate that restricts the heat that it holds out to the ground.

  According to this structure, the heat insulation plate suppresses heat outflow from the soil located near the hot air outlet of the duct to the ground. According to the study by the present inventors, in the air convection type underfloor heating system, the outflow of heat to the ground is unavoidable in the entire underfloor space, but such heat outflow is located in the vicinity of the hot air outlet of the duct. It was found to be particularly prominent in the soil part. Therefore, by locally laying a heat insulating plate on the surface of the soil located in the vicinity of the hot air outlet, the effect of suppressing heat outflow can be efficiently exhibited.

  In the above configuration, the hot air outlet of the duct is installed at a substantially middle portion in the height direction of the underfloor space, and is configured to blow out hot air in a direction substantially horizontal to the floor surface, It is desirable that the heat insulating plate is laid on the soil surface so as to cover a portion where the warm air blown from the blowout port directly blows against the soil surface (Claim 2). According to this configuration, hot air can be supplied in an optimal manner to the underfloor space, and the outflow of the heat of the hot air blown out from such a duct to the ground is directly affected by the hot air. It becomes very effectively suppressed by the heat insulating plate laid on the surface portion.

  Further, in the above configuration, the underfloor space is divided into a plurality of underfloor spaces, and each underfloor space is in communication with each other via a predetermined communication portion. It is desirable that a heating facility and a heat insulating plate provided with the hot air blowing duct are installed so that the hot air is convected through the communicating portion to another underfloor space section. According to this configuration, even when the underfloor space is divided into a plurality of underfloor spaces, the hot air is convected in other underfloor space compartments by the heating equipment installed in one underfloor space compartment. Can do. And the heat insulation board laid in one underfloor space division comes to suppress the heat outflow to the ground.

  In such a configuration, it is desirable that an auxiliary fan for accelerating the convection of the warm air is disposed in the communication portion. According to this configuration, the convection of warm air through the communication portion from one underfloor space section to another underfloor space section is promoted by the auxiliary fan, and the other underfloor space sections that are not equipped with heating facilities are also positive. Can be warmed up.

  Here, in the case where a plurality of the communication portions are provided and an air flow path that circulates a plurality of underfloor space sections can be formed, an auxiliary fan is provided in each of the communication portions constituting the air flow path, The blowing direction of the auxiliary fan may be configured to be a direction in which warm air can be circulated in the plurality of underfloor spaces along the air flow path (Claim 5). According to this configuration, the warm air is circulated along the air flow path by the operation of the auxiliary fan, and the warm air can be spread throughout the underfloor space.

  In the case where a plurality of communication portions are provided and a plurality of air flow paths that circulate a plurality of underfloor space sections can be formed, auxiliary fans are provided in the communication portions that can form the plurality of air flow paths. In addition, by controlling the blowing direction of each auxiliary fan, it can be configured to circulate hot air along any of the plurality of air flow paths (Claim 6). According to this configuration, a circulation path of hot air can be set according to needs, and for example, a desired indoor space can be selectively heated.

  According to the underfloor heating system according to the first aspect, the heat outflow to the ground can be regulated by laying the heat insulating plate. Moreover, the thermal efficiency can be greatly improved by simply laying a heat insulating plate on the minimum necessary part of the soil surface located near the hot air outlet of the duct. Therefore, the energy efficiency of the underfloor heating system can be improved without causing much cost increase.

  According to the underfloor heating system according to the second aspect, the heat outflow to the ground is suppressed by the heat insulating plate laid on the surface of the soil where the hot air blown from the duct directly blows. That is, since the heat outflow to the ground is suppressed in the hot air blowing portion where heat is most easily removed, the thermal efficiency can be effectively improved.

  According to the underfloor heating system according to the third aspect, even in a house in which the underfloor space is partitioned into a plurality of underfloor spaces, the energy efficiency can be similarly improved.

  According to the underfloor heating system according to claim 4, since the convection of the hot air through the communicating portion is promoted by the operation of the auxiliary fan, the use efficiency of the hot air blown from the hot air blowing duct is increased, It becomes possible to suppress variations in temperature between the underfloor space section provided with the hot air blowing duct and the underfloor space section not provided.

  According to the underfloor heating system of the fifth aspect, since the warm air can be spread over the entire underfloor space by the operation of the auxiliary fan, each indoor space on the underfloor space can be evenly heated.

  According to the underfloor heating system according to the sixth aspect, the circulation path of the hot air can be freely set, and the desired indoor space can be selectively heated. Heating can be set easily and without any additional work.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing the configuration of an underfloor heating system S1 according to the present invention, and is a top view of a foundation structure 100 as seen from a floor plate portion of a house. FIG. 2 is a side sectional view of the foundation structure 100. The foundation structure 100 is constructed of foundation concrete 101 and soil concrete 102, and an underfloor space 10 corresponding to the height of the foundation concrete 101 is formed. The underfloor space 10 is divided into a plurality of underfloor spaces according to the size of the living room. Here, when viewed from the center of the house, the first underfloor space 11 in the northwest to west direction, the second underfloor space 12 in the southwest direction, the third underfloor space 13 in the southeast direction, the fourth underfloor space 14 in the east direction, and the northeast direction An example in which a fifth underfloor space 15 is provided is shown.

  Further, the foundation structure 100 employs a so-called foundation heat insulation method, and the foundation concrete 101 constituting the outer peripheral portion is not provided with a ventilation port, and the underfloor space 10 is a closed space. And as shown in FIG. 2, the heat insulating material 103 is given also to the circumference | surroundings of the foundation concrete 101 which comprises an outer peripheral part, and not only a housing | casing part but the foundation part is also insulated. On the other hand, the basic concrete 101 that divides the first to fifth underfloor spaces 11 to 15 is provided with communication portions W1 to W6, and the first to fifth underfloor spaces 11 to 15 are provided via the communication portions W1 to W6. Are in communication with each other. In addition, the said communication part W1-W6 is utilized also as an operator's channel | path in the case of the maintenance of the underfloor space 10, etc.

  In such a basic structure 100, the heat pump air conditioner 2 (heating equipment) is installed in the first underfloor space 11. The heat pump air conditioner 2 is for supplying warm air H to the underfloor space 10 to heat the underfloor space 10 and includes a duct 21 for blowing out the warm air. The heat pump air conditioner 2 is also provided with an outdoor unit (not shown).

  The heat pump air conditioner 2 is suspended and supported by using large pulls 51 and 51 (which may be joists) assembled on the lower surface of the floor board 5. That is, the hanging tools 23 and 23 are attached to the large pulls 51 and 51, and a flat plate-like support base 24 is bridged in the horizontal direction at the lower ends of the hanging tools 23 and 23. The heat pump air conditioner 2 is placed on the support base 24. The heat pump air conditioner 2 may be installed on the soil concrete 102 without performing such suspension support.

  The duct 21 is formed of a cylindrical body having a bellows structure, and has a hot air outlet 22 for blowing the hot air generated by the heat pump air conditioner 2 into the underfloor space 10. As shown in FIG. 2, the hot air outlet 22 is disposed at a substantially intermediate portion in the height direction of the first underfloor space 11 (underfloor space 10), and thereby warm air H is directed in a direction substantially horizontal to the floor board 5. Is to be blown out. The hot air H blown out from the duct 21 is convected in the first underfloor space 11 and is also convected through the communicating portions W1 to W6 to other underfloor spaces, that is, the second to fifth underfloor spaces 12 to 15. (Circulated).

  In order to promote convection of the hot air H, auxiliary fans 31 and 32 composed of small fans or the like are arranged in the communication portions W1 and W2 in accordance with the position of the hot air outlet 22. Here, the blowing direction of the auxiliary fan 31 is a direction in which the warm air H is directed from the first underfloor space 11 to the second underfloor space 12, and the blowing direction of the auxiliary fan 32 is the fourth from the first underfloor space 11. The warm air H is directed to the underfloor space 14.

  Thereby, as shown by the arrow F in FIG. 1, the hot air H is forcibly convected to the first to fifth underfloor spaces 11 to 15. That is, the warm air H is positively convected from the first underfloor space 11 to the second to fifth underfloor spaces 12 to 15 as compared with natural convection via the communication portions W1 to W6. The first to fifth underfloor spaces 11 to 15 are heated by the convection of the hot air H, and the indoor space R above the floor board 5 is heated by the heat of the first to fifth underfloor spaces 11 to 15 that is raised by the heating. Will be heated. In addition, since the warm air H does not stay in the first underfloor space 11 for a long time, heat outflow that escapes into the soil from the soil concrete 102 in the first underfloor space 11 (excluding a portion where a heat insulating material 4 is laid later) is suppressed. become able to.

  In the underfloor heating system S <b> 1 configured as described above, in the present invention, the heat insulating plate is covered so that the hot air H blown out from the outlet 22 of the duct 21 directly blows against the surface of the soil concrete 102. 4 is laid on the soil concrete 102. That is, the heat insulating plate 4 is not laid on the entire area of the soil concrete 102 in the first underfloor space 11 but locally on the surface of the soil concrete 102 located in the vicinity of the hot air outlet 22. Thereby, it is efficiently controlled that the heat held by the blown warm air H flows out to the ground G through the soil concrete 102.

  FIG. 3 is a top view for explaining a state in which the heat insulating plate 4 is laid on the soil concrete 102. As described with reference to FIG. 2, the hot air H is blown out from the blowout port 22 of the duct 21 in a direction substantially horizontal to the floor plate 5, but after being blown out from the blowout port 22, it diffuses according to parameters such as the wind speed. . Due to this diffusion, a part of the warm air H directly blows against the surface of the soil concrete 102. An elliptical spot 201 shown in FIG. 3 shows a portion where such hot air H is directly blown.

  In general, in the underfloor heating system, the heat outflow from the elliptical spot 201 portion, that is, the heat outflow from the soil surface located in the vicinity of the hot air outlet 22 to the ground G is the largest. By taking measures, energy efficiency can be increased. In other words, if even the elliptical spot 201 portion is subjected to heat loss reduction measures, considerable energy efficiency can be improved. In view of such knowledge, the heat insulating plate 4 is locally laid on the soil concrete 102 so as to cover the elliptical spot 201.

  In the case where such a heat insulating plate 4 is not provided, as shown in FIG. 4, from the portion (part indicated by reference numeral 102 a in FIG. 4) where a part of the hot air H blows directly on the surface of the soil concrete 102, The heat held by the wind H is absorbed (heat exchange) as heat loss r to the ground G. This becomes remarkable at the initial stage until the underfloor heating system is operated for a predetermined time and the soil concrete 102 is warmed. However, as shown in FIGS. 1 to 3, the heat loss r as described above is effective by providing the heat insulating plate 4 at a portion where a part of the hot air H blows directly on the surface of the soil concrete 102. Will be deterred.

  As shown in FIG. 5, the outlet 220 of the duct 210 is oriented to the floor plate 5 side (upper side) so that the hot air H blown from the outlet 220 does not directly blow against the soil concrete 102. It is also possible. However, when the outlet 220 is set in this way, the amount of hot air H blown to the floor board 5 becomes too large, and the floor board 5 is excessively heated, resulting in a large temperature difference between the underfloor space 10 and the floor board 5. As a result, dew condensation occurs, which is not preferable.

  As the heat insulating plate 4, members having various heat insulating actions can be used, for example, fiber heat insulating materials such as glass wool, foamed material heat insulating materials obtained by foaming plastic materials such as polystyrene, polyethylene, polyurethane, polycarbonate, and the like. Can be used. As the heat insulating plate 4, it is desirable to use a heat insulating material made of a hard member so as to have resistance against blowing of warm air H over a long period of time, for example, a heat insulating material made of extruded foamed polystyrene board (width 1 m × length). 2 m × thickness plate of about 25 to 50 mm) can be preferably used.

  Operation | movement of the underfloor heating system S1 comprised as mentioned above is demonstrated. When the power supply of the heat pump air conditioner 2 is turned on and the heating operation is started, the hot air H is blown out from the outlet 22 of the duct 21 into the first underfloor space 11. The warm air H convects in the first underfloor space 11, and thereby the inside of the first underfloor space 11 is heated. At this time, the heat insulating plate 4 restricts the heat outflow from the soil concrete 102 to the ground G in the vicinity of the outlet 22. Note that the auxiliary fans 31 and 32 are also started simultaneously with the start of the operation of the heat pump air conditioner 2.

  Due to the rotational drive of the auxiliary fan 31, the warm air existing in the first underfloor space 11 is forcibly convected to the second underfloor space 12 through the communication portion W1, and then to the third underfloor space 13 through the communication portion W3. Similarly, it is forcibly convected through the communication part W2 to the fourth underfloor space 14, and then through the communication part W5 to the fifth underfloor space 15.

  As the heat pump air conditioner 2 and the auxiliary fans 31 and 32 are operated in this manner, the entire underfloor space 10 is heated. And the indoor space R on the floor board 5 is heated by the temperature of the underfloor space 10 rising. In addition, by operating the heat pump air conditioner 2 continuously, the temperature of the soil concrete 102 rises gradually, thereby reducing heat loss from the region where the heat insulating plate 4 is not laid.

  Hereinafter, various comparison data in the case where the heat insulating plate 4 is locally installed near the outlet 22 of the duct 21 and in the case where it is not installed will be described. As shown in FIG. 1, FIG. 6 shows that before and after the heat insulating plate 4 is laid in the vicinity of the air outlet 22 in the first underfloor space 11 (the laying date is the leap year “ It is a graph created by measuring the temperature (air temperature) of the first underfloor space 11 after operation of the heat pump air conditioner 2 for one week before and after the laying date. Here, one heat pump air conditioner 2 having a heating capacity of 6.0 kW was used, and the operating conditions were constant for two weeks.

  In FIG. 6, the curve 601 is the temperature measured at the “northwest” point in the first underfloor space 11 shown in FIG. 1, and the curve 602 is the temperature measured at the “west” point in the first underfloor space 11. . Moreover, the curve of the code | symbol 603 shows external temperature. As can be seen from FIG. 6, the operating conditions of the heat pump air conditioner 2 are changed at both the “northwest” point and the “west” point after the heat insulating plate 4 is laid, compared to before the heat insulating plate 4 is laid. Despite the absence, the temperature generally increased by about 1 to 3 ° C., and it was confirmed that the ventilation characteristics of the underfloor space were improved by the laying of the heat insulating plate 4.

  Next, FIG. 7 is prepared by measuring the heat flow of the soil concrete 102 before and after laying the heat insulating plate 4 in the vicinity of the air outlet 22 in the first underfloor space 11 using a heat flow meter. It is a graph. As in FIG. 6, the measurement points are the “northwest” point and the “west” point in the first underfloor space 11 shown in FIG. 1. In FIG. 7, the curve 611 indicates the heat flow of the soil concrete 102 at the “northwest” point, and the curve 612 indicates the heat flow of the soil concrete 102 at the “west” point. In addition, the 0 level of the heat flow shown with the code | symbol 613 is equivalent to the heat level of the soil concrete 102, and the heat | fever has flowed out to the ground G side in the time slot | zone when the heat flow below the said 0 level is observed. Is shown.

  As is clear from FIG. 7, after the heat insulating plate 4 is laid, the degree of heat flow is less than 0 level at both the “northwest” point and the “west” point, and the heat insulating plate 4 prevents heat outflow. It can be seen that It can also be seen that the heat loss at the “west” point is also reduced.

Next, simulation results for confirming the effect when the heat insulating plate 4 is laid in the vicinity of the hot air outlet 22 of the duct 21 and when it is not laid will be described. Here, assuming the floor plan condition (underfloor area: 70 m ² ) shown in FIG.
(1) Transition of the surface temperature of the back surface of the floor board 5 (FIGS. 8 and 9)
(2) Transition of surface temperature of soil concrete 102 (FIGS. 10 and 11)
(3) Transition of heat flow to floor plate 5 and ground G (Figs. 12 and 13)
The simulation result about is shown. The heat pump air conditioner 2 was operated at a set temperature under the floor: 30 ° C., a set temperature for blowing hot air H at the outlet 22: 46 ° C., and a flow rate of the hot air H: 300 m ³ / h. Moreover, the heat insulation board 4 shall lay the extrusion expanded polystyrene board of width 1m * length 2m * thickness 25mm on the soil concrete 102 in the vicinity of the warm air blowing port 22. FIG.

(1) Transition of the surface temperature of the back surface of the floor board 5 FIG. 8 shows the back surface of the floor board 5 at the above-mentioned “northwest” point and “west” point when the heat insulating board 4 is not laid, as seen over a two-month span. It is a graph which shows the calculation result of transition of temperature. In FIG. 8, the curve 621 indicates the transition of the back surface temperature of the floor board 5 at the “northwest” point, and the curve 622 indicates the transition of the back surface temperature of the floor board 5 at the “west” point. As shown in the graph of FIG. 8, the back surface temperature of the floorboard 5 changes in a range of approximately 24 ° C. to 28 ° C. at the “northwest” point, and approximately 29 ° C. to 32 ° C. at the “west” point. It turns out that it changes in the range.

  On the other hand, FIG. 9 is a graph showing the calculation result of the transition of the back surface temperature of the floor board 5 at the “northwest” point and the “west” point when viewed from the 2-month span when the heat insulating board 4 is laid. In FIG. 9, a curve 631 indicates the transition of the back surface temperature of the floor board 5 at the “northwest” point, and a curve 632 indicates the transition of the back surface temperature of the floor board 5 at the “west” point. As shown in the graph of FIG. 9, the back surface temperature of the floor board 5 changes in a range of approximately 25 ° C. to 28 ° C. at the “northwest” point, and approximately 29 ° C. to 33 ° C. at the “west” point. It turns out that it changes in the range. Thus, compared with the case where the heat insulation board 4 is not laid, the back surface temperature of the floor board 5 can be raised as a whole by about 1 ° C. by laying the heat insulation board 4.

(2) Transition of surface temperature of interstitial concrete 102 FIG. 10 shows the transition of surface temperature of the interstitial concrete 102 at the “northwest” point and “west” point when the insulation board 4 is not laid, as seen over a two-month span. It is a graph which shows the calculation result of. In FIG. 10, the curve 641 indicates the surface temperature of the soil concrete 102 at the “northwest” point, and the curve 642 indicates the transition of the surface temperature of the soil concrete 102 at the “west” point. As shown in the graph of FIG. 10, the surface temperature of the interstitial concrete 102 changes in a range of approximately 17 ° C. to 24 ° C. at the “northwest” point, and is approximately 17 ° C. to 28 ° C. at the “west” point. It turns out that it changes in the range.

  On the other hand, FIG. 11 is a graph showing the calculation result of the transition of the surface temperature of the soil concrete 102 at the “northwest” point and the “west” point when viewed from the two-month span when the heat insulating plate 4 is laid. In FIG. 11, the curve 651 indicates the surface temperature of the soil concrete 102 at the “northwest” point, and the straight line 652 indicates the transition of the surface temperature of the soil concrete 102 at the “west” point. The “west” point here is calculated assuming that it is set on the back surface of the heat insulating plate 4. As shown in the graph of FIG. 11, at the “northwest” point, the back surface temperature of the floorboard 5 has changed in a range of approximately 17 ° C. to 24 ° C., which is equivalent to the case of FIG. In point, it is constant at 17 ° C. Thus, compared with the case where the heat insulating plate 4 is not laid, the heat outflow to the ground G can be regulated at the “west” point by laying the heat insulating plate 4.

(3) Transition of heat flow to floor plate 5 and ground G FIG. 12 shows 2 to floor plate 5 and ground G in the immediate vicinity of blowing duct 21 (laying region portion of heat insulating plate 4) when heat insulating plate 4 is not laid. It is a graph which shows the calculation result of transition of the heat flow seen in the month span. In FIG. 12, the curve 661 indicates the heat flow to the floor plate 5, and the curve 662 indicates the transition of the heat flow to the ground G. As shown in the graph of FIG. 12, the heat flow to the floor board 5 rises from about 1000 kcal / h to about 1600 kcal / h during a period of two months, and conversely, the heat flow to the ground G goes from about 400 kcal / h to about 150 kcal / h. It turns out that it is falling.

  On the other hand, FIG. 13 shows the calculation result of the transition of the heat flow as seen over the two-month span to the floor plate 5 and the ground G in the immediate vicinity of the blowout duct 21 (laying region portion of the heat insulating plate 4) when the heat insulating plate 4 is laid. It is a graph to show. In FIG. 13, the curve 671 indicates the heat flow to the floor plate 5, and the curve 672 indicates the transition of the heat flow to the ground G. As shown in the graph of FIG. 13, the heat flow to the floor board 5 rises from 1100 kcal / h to about 1600 kcal / h during a period of two months, and conversely, the heat flow to the ground G from about 300 kcal / h to about 100 kcal / h. It turns out that it is falling. That is, the heat flow to the floor board 5 is about 100 kcal / h higher than the case where the heat insulating board 4 is not laid during the initial period, and conversely, the heat flow to the ground G is about 100 kcal / h less. That is, the energy efficiency of the heat pump air conditioner 2 can be improved in the initial period.

  As mentioned above, although the underfloor heating system S1 which concerns on one Embodiment of this invention was explained in full detail, various deformation | transformation implementation is possible about this underfloor heating system S1. For example, in the underfloor heating system S1, an example in which two auxiliary fans 31 and 32 are used as shown in FIG. 1 is shown. For example, the indoor space on the first underfloor space 11 is the main living space of the user. In such a case, the installation of the auxiliary fans 31 and 32 may be omitted.

  On the contrary, you may make it provide an auxiliary fan in all the communication parts W1-W6. FIG. 14 is a schematic diagram showing the configuration of such an underfloor heating system S2. In the underfloor heating system S2, auxiliary fans 31 to 36 are provided in the communication portions W1 to W6, respectively. As shown in FIG. 14, when the communication part W1-W6 is provided in the foundation concrete 101, as an air flow path which circulates through some of the 1st underfloor space 11-the 5th underfloor space 15, the communicating part W1. A typical example is the first air flow path A1 passing through -W3-W4-W5-W6 and the second air flow path A2 passing through the communication portion W2-W5-W6. The blowing direction of each of the auxiliary fans 31 to 36 is a direction in which hot air can be circulated in the plurality of underfloor spaces along the first air flow path A1 or the second air flow path A2.

  Specifically, the blowing direction of the auxiliary fan 31 is the direction from the first underfloor space 11 to the second underfloor space 12, and the blowing direction of the auxiliary fan 33 is the direction from the second underfloor space 12 to the third underfloor space 13. The blowing direction of the auxiliary fan 34 is the direction from the third underfloor space 13 to the fourth underfloor space 14, the blowing direction of the auxiliary fan 35 is the direction from the fourth underfloor space 14 to the fifth underfloor space 15, and the auxiliary fan 36. The air blowing direction is a direction from the fifth underfloor space 15 to the first underfloor space 11, and by operating these auxiliary fans, hot air can be circulated along the first air flow path A1. ing. The air blowing direction of the auxiliary fan 32 is the direction from the first underfloor space 11 to the fourth underfloor space 14, and the auxiliary fans 32, 35, and 36 are operated along the second air flow path A2. Hot air can be circulated.

  By comprising in this way, the warm air H is circulated along 1st, 2nd air flow path A1, A2 by the driving | operation of auxiliary fan 31-36, and the whole 1st underfloor space 11-5th underfloor space 15 is the whole. It is possible to spread warm air. That is, the underfloor space 10 of the entire first floor portion of the house can be heated. Thereby, each indoor space of the 1st underfloor space 11-the 5th underfloor space 15 can be heated uniformly, and the variation in the temperature of indoor space can be suppressed now. Alternatively, by operating only the auxiliary fans 32, 35, and 36, the first, fourth, and fifth underfloor spaces 11, 14, and 15 along the second air flow path A2 are preferentially heated, and the floor It is also possible to increase the thermal efficiency by selectively heating the indoor space.

  Moreover, it is desirable to provide a control unit that changes and controls the blowing direction of the auxiliary fans 31 to 36 so that the blowing direction can be appropriately changed according to the heating needs. In this case, each of the auxiliary fans 31 to 36 may be provided with a drive mechanism for changing the air blowing direction, and the air blowing direction change signal may be transmitted to the drive mechanism by a remote control device provided with the control unit. . With this configuration, it is possible to freely set the circulation path of the hot air. For example, by reversing the blowing direction of the auxiliary fans 34 and 35 shown in FIG. 14 by approximately 180 degrees, it becomes possible to concentrate the warm air on the third underfloor space 13, and the indoor space on the floor of the third underfloor space 13 It becomes possible to heat mainly. According to such an underfloor heating system S2, it becomes possible to selectively heat a desired indoor space, so that the heating setting according to the lifestyle of the user can be easily performed, and the blowing direction of the auxiliary fans 31 to 36 is easy. Since it is only necessary to change this, it can be performed without requiring any other work.

  In addition, since the communication parts W1-W6 are utilized as a worker's passage at the time of maintenance of the underfloor space 10 as described above, the auxiliary fans 31-36 are detachable fixing parts so as not to obstruct the passage. It is desirable to provide. For example, it is desirable to provide each auxiliary fan 31 to 36 with a clip fixing portion that can be easily fixed to a joist around the communication portions W1 to W6 or a large pull.

  As mentioned above, although embodiment was described about this invention, this invention is not limited to this. For example, although the heat pump air conditioner 2 is illustrated as an example of the heating facility, various radiators that can radiate the hot air H can be used. Moreover, although the example which uses a rectangular shape by the top view was shown as a form of the heat insulating board 4, according to the shape of the blower outlet 22 of the duct 21, you may form in an ellipse shape or a fan shape, for example.

It is a mimetic diagram showing composition of underfloor heating system S1 concerning the present invention, and is a top view of a foundation structure which removed and looked at a floor board part of a house. It is a sectional side view of the foundation structure shown in FIG. It is a top view for demonstrating the laying state on the soil concrete of a heat insulating board. It is a schematic diagram which shows the structure of the conventional underfloor heating system which does not provide a heat insulating board. It is a schematic diagram which shows the structure of the underfloor heating system which orient | assigned the blower outlet of the duct to the floor-plate side (upper side). It is a graph which shows temperature (temperature) transition of underfloor space before and after laying a heat insulation board in the vicinity of a blower outlet. It is the graph created by measuring the heat flow to the soil concrete before and after laying a heat insulation board in the vicinity of a blower outlet using a heat flow meter. It is a graph which shows the calculation result of transition of the back surface temperature of a floor board when not laying a heat insulating board (conventional). It is a graph which shows the calculation result of transition of the back surface temperature of a floor board at the time of laying a heat insulating board (this invention). It is a graph which shows the calculation result of transition of the surface temperature of soil concrete when not laying a heat insulating board (conventional). It is a graph which shows the calculation result of transition of the surface temperature of soil concrete at the time of laying a heat insulating board (this invention). It is a graph which shows the calculation result of transition of the heat flow to the floor board and the ground in the blow duct duct nearest part when not laying a heat insulating board (conventional). It is a graph which shows the calculation result of transition of the heat flow to the floor board and the ground in the blow duct duct nearest part at the time of laying a heat insulating board (this invention). It is a schematic diagram which shows the structure of underfloor heating system S2 concerning other embodiment of this invention, Comprising: It is the upper side figure of the foundation structure which removed and looked at the floor-plate part of a house.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Underfloor space 11-15 The 1st-5th underfloor space 100 Foundation structure 101 Fundamental concrete 102 Dirt concrete (glow)
2 Heat pump air conditioner (heating equipment)
21 Duct 22 (Hot air) outlet 31-36 Auxiliary fan 4 Heat insulation plate A1, A2 Air flow path H Warm air G Ground S1 Underfloor heating system

Claims (6)

An underfloor heating system in a basic heat insulating house with a closed space under the floor,
An underfloor heating system configured to heat an indoor space on the floor by installing a heating facility having a hot air blowing duct in the underfloor space and causing the hot air blown from the duct to convect to the underfloor space. In
An underfloor heating system characterized in that a heat insulating plate for locally restricting the heat held by the blown hot air from flowing out to the ground is laid on the surface of the soil located near the hot air outlet of the duct. . The hot air outlet of the duct is installed at a substantially middle portion in the height direction of the underfloor space, and is configured so that the hot air is blown out in a direction substantially horizontal to the floor surface,
The underfloor heating system according to claim 1, wherein the heat insulating plate is laid on the soil surface so as to cover a portion where the warm air blown from the blowout port directly blows against the soil surface. . The underfloor space is partitioned into a plurality of underfloor spaces, and each underfloor space partition is in communication with each other via a predetermined communication portion,
Heating equipment and a heat insulating plate including the hot air blowing duct are installed in one underfloor space section, and the hot air is convected through the communicating portion to another underfloor space section. The underfloor heating system according to claim 1 or 2.   The underfloor heating system according to claim 3, wherein an auxiliary fan for promoting convection of the warm air is disposed in the communication portion. In the case where a plurality of the communication portions are provided and an air flow path that circulates a plurality of underfloor space sections can be formed,
Auxiliary fans are respectively provided in the communication portions constituting the air flow path, and the blowing direction of each auxiliary fan is set to a direction in which hot air can be circulated in the plurality of underfloor spaces along the air flow path. The underfloor heating system according to claim 4. In the case where a plurality of the communication portions are provided and a plurality of air flow paths that circulate a plurality of underfloor space sections can be formed,
Auxiliary fans are respectively provided in the communication portions that can configure the plurality of air flow paths, and hot air can be circulated along any of the plurality of air flow paths by controlling the blowing direction of each auxiliary fan. It is comprised as follows. The underfloor heating system of Claim 4 characterized by the above-mentioned.

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