JP2009052766A - Underfloor heating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To optimize an operating condition of a hot air blower giving heat to a sensible heat storage material in an underfloor heating system of a foundation insulation detached house using the sensible heat storage material as a radiation source. <P>SOLUTION: In this underfloor heating system in the foundation insulation detached house having a closed space under a floor, a heat storage unit 2 having a sensible heat storage body, the hot air blower 3 for blowing off the hot water to the sensible heat storage body to store heat, and an air blower 4 for promoting the radiation of heat stored in the sensible heat storage body by distributing the air to the sensible heat storage body in a heat storage state, are dispose in the space under the floor 12. An operating condition of the hot air blower 3 is decided on the basis of a prescribed relational expression including the blown-off air volume, a blow-off temperature and an operation time as variable numbers. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an underfloor heating system that heats an indoor space on a floor by using a sensible heat storage body and causing convection of warm air in the underfloor space in a basic heat insulating house where the underfloor is 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 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 that have closed floors by closing the underfloor vents of the houses to insulate the outer peripheries of the floors, 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. Furthermore, it is also considered to incorporate a heat storage material such as a latent heat storage material or a sensible heat storage material into the underfloor heating system as a heat radiation source using inexpensive nighttime electric power.
JP 2001-201075 A

  When constructing an underfloor heating system equipped with a heat storage material, for example, a heat pump air conditioner (warm air blower) is operated during nighttime power hours, the heat storage material is heated by blowing warm air, and the heat storage material is used during daytime hours. A method of diffusing and supplying the heat stored in the inside of the underfloor space with a blower can be considered. Here, when a sensible heat storage material is used as the heat storage material, the heat storage temperature of the sensible heat storage material depends on the temperature of the hot air to be blown. Therefore, it is indispensable to operate the heat pump air conditioner at any airflow rate and airflow temperature in a limited time zone such as a nighttime power time zone for system operation with high efficiency and good cost performance.

  The present invention has been made in view of the above requirements, and in the underfloor heating system of a basic heat insulating house using a sensible heat storage material as a heat radiation source, the operating conditions of the hot air blower that applies heat to the sensible heat storage material are optimized. The purpose is to be able to.

  The underfloor heating system according to the present invention is an underfloor heating system applied to a basic heat insulating house having a floor under a living room as a closed space, and a sensible heat storage body disposed in the underfloor space, and the sensible heat storage body A hot air blower that blows warm air to store heat, and a control unit that can control operating conditions including the blown air volume, the blowing temperature, and the operating time of the hot air blower, and the operating conditions are supplied to the living room. Based on the first relational expression showing the heat balance of the living room at the time of operation of the hot air blower when it is assumed that heat supply is performed only from under the floor, and at a predetermined outside air temperature based on the heat balance In a state in which the hot air blower is operated, the second relational expression indicating a target underfloor temperature for setting the living room to a predetermined set temperature is derived from the sensible heat storage body when the hot air blower is in operation. Is blown by the hot air blower It is a relational expression showing the amount of heat necessary to achieve the target underfloor temperature when it is assumed that heat is supplied at the outlet temperature and heat is supplied to the underfloor. It is determined based on a third relational expression included as a variable.

  According to this configuration, the operating conditions of the hot air blower that stores hot air by blowing hot air to the sensible heat storage body are determined based on the first to third relational expressions. That is, the target underfloor temperature is set based on the heat balance of the room, and the amount of heat necessary for this is determined, and then the amount of blown air, the temperature of the blown air, and the operating time of the hot air blower are determined. Therefore, the optimal operating condition of the hot air blower can be set according to the condition of the room of each basic heat insulating house.

  The said structure WHEREIN: It is desirable to further provide the air blower which accelerates | stimulates heat dissipation of the heat | fever stored by the said sensible heat storage body by sending air to the sensible heat storage body in a heat storage state. According to this configuration, the heat stored in the sensible heat storage body can be quickly diffused into the underfloor space.

  In any one of the configurations described above, it is desirable that the first relational expression is a conditional expression of the following (1).

  In the above configuration, it is desirable that the second relational expression is a conditional expression (2) below.

  In the above configuration, it is desirable that the third relational expression be a conditional expression of the following (3) when the hot air blower operating time h is fixed (Claim 5).

  Further, it is desirable that the third relational expression is a conditional expression of the following (4) when the hot air blower blowing temperature is fixed.

  In any one of the configurations described above, it is preferable that the controller operates the hot air blower during a nighttime electric power period (Claim 7).

  According to the underfloor heating system which concerns on this invention, according to the conditions of the room of each basic heat insulation house, the optimal operating condition of a warm air blower can be set. Therefore, in an underfloor heating system for a basic heat insulation house using a sensible heat storage material as a heat radiation source, system operation with high efficiency and good cost performance can be achieved.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram schematically showing an application state of the underfloor heating system according to the embodiment of the present invention to a house H. This house H is a basic heat insulation house in which the living room 11 and the underfloor 12 are partitioned by a floor board 13 and the space under the floor 12 is a closed space. The underfloor heating system of this embodiment includes a heat storage unit 2, a hot air blower 3, and a blower 4 that are arranged in a space under the floor 12.

  The heat storage unit 2 has a housing structure, and a sensible heat storage body is accommodated in the housing, and an air duct for causing heat storage to the sensible heat storage body or heat radiation from the sensible heat storage body by airflow is provided. Is formed.

  The hot air blower 3 is a device that can blow out hot air having a temperature higher than room temperature, and heats the room 11 by heating the sensible heat storage body of the heat storage unit 2 and the space under the floor 12. Play a role. The hot air blower outlet of the hot air blower 3 is connected to the inlet side of the air duct of the heat storage unit 2 via the duct 31. When the hot air blower 3 is operated, hot air is sent out to the air duct. The hot air is heated to the sensible heat storage body in the heat storage unit 2 and then blown out from the outlet side of the air duct to the space under the floor 12 as indicated by an arrow in the figure. Accordingly, the underfloor 12 is heated by the warm air having the residual heat after heat exchange with the sensible heat storage body, and the living room 11 is heated by this heat.

  The blower 4 is a device that can blow air at a predetermined wind speed, and plays a role of promoting the heat radiation of the heat stored in the sensible heat storage body of the heat storage unit 2. A blower opening of the blower 4 is connected to an inlet side of the air duct of the heat storage unit 2 through a duct 41. When the blower 4 is operated, normal temperature air (air under the floor 12) is sent to the air duct. . When the sensible heat storage body is in a heat storage state, the air takes heat from the surface of the heat storage body and is blown out from the outlet side of the air duct to the space under the floor 12. Therefore, when the sensible heat storage body is in the heat storage state, it is possible to warm the space under the floor 12 by operating the blower 4 without operating the warm air blower 3.

  FIG. 2 is a block diagram showing an electrical configuration of the underfloor heating system according to the present embodiment. The underfloor heating system includes a control unit 5 and an operation unit 6 in addition to the hot air blower 3 and the blower 4 described above. The control unit 5 controls operations of the hot air blower 3 and the blower 4, and functionally includes a hot air blower control unit 51, a blower control unit 52, and a data storage unit 53.

  The hot air blower control unit 51 controls operating conditions including the amount of hot air blown from the hot air blower 3, the blowout temperature, and the operating time. This operating condition will be described in detail later. When the hot air blower 3 has a mechanism for electrically generating hot air, generally, a large amount of electric power is required to generate heat. For this reason, the hot air blower control part 51 operates the hot air blower 3 in the night electric power time zone (23: 00-7 o'clock) where the power rate is relatively inexpensive. That is, the sensible heat storage body of the heat storage unit 2 performs a heat storage operation during the nighttime power hours.

  The blower control unit 52 controls the amount of air blown from the blower 4 and the operating time. The blower control unit 52 drives the blower 4 at an appropriate time in the daytime time zone in order to dissipate the heat stored in the sensible heat storage body during the nighttime power time zone in the daytime.

  The data storage unit 53 stores various operating condition data necessary when the hot air blower control unit 51 and the blower control unit 52 control the hot air blower 3 and the blower 4, respectively.

  The operation part 6 consists of a touch panel, a keyboard, etc., and receives the input of the operation information with respect to the said underfloor heating system from a user. The user inputs, for example, the heating temperature of the living room 11 through the operation unit 6.

  Next, the operating conditions of the hot air blower 3 will be described. These operating conditions are based on the assumption that the hot air blower 3 is operated during a limited time period, ie, the nighttime power time period, and the sensible heat storage body stores heat, the outside air condition, the set temperature of the living room 11, and the thermal performance of the house H. It is decided according to.

  The operating condition includes a first relational expression indicating a heat balance of the living room 11 when the hot air blower 3 is in operation when the heat supply to the living room 11 is assumed to be performed only from under the floor 12 and the heat balance. Based on the second relational expression indicating the temperature of the underfloor 12 as a target for setting the living room 11 to a predetermined set temperature in a state where the hot air blower 3 is operated at a predetermined outside air temperature, and the hot air blower 3 The relational expression indicating the amount of heat necessary to achieve the target underfloor temperature when it is assumed that the sensible heat storage body is heated at the blowing temperature of the hot air blower 3 and heat is supplied to the underfloor 12 during operation of And it is determined based on the third relational expression including the blowing air volume, the blowing temperature and the operating time as variables. Hereinafter, specific examples of the first to third relational expressions will be exemplified.

<First relational expression>
It is assumed that the heat supply to the living room 11 is performed only from the underfloor 12 through the floor board 13, and the blower 4 is always operating when the hot air blower 3 is stopped. Considering the fluctuation of the outside air during the day and night, the heat balance of the living room 11 when the hot air blower 3 is operating in the nighttime power hours is expressed by the following conditional expression (1).

<Second relational expression>
During operation of the hot air blower 3 during the night power hours, the underfloor temperature T ^C targeted for setting the room temperature T ^R at a certain outside air temperature T ^O is modified from the above equation (1). Is expressed by the following conditional expression (2).

<Third relational expression>
Here, the heat supplied from the hot air blower 3 to the sensible heat storage body (heat storage unit 2) is radiated 100% by the air blown by the blower 4, and the amount of heat supplied to the underfloor 12 through the heat storage unit 2 Of these, it is assumed that R × 100 [%] transfers heat to the living room 12 through the floor plate 13. At this time, the operating conditions of the hot air blower 3 that is required to keep the room temperature for one day room 11 to set room temperature T ^R, i.e. balloon airflow warm air blower 3, the relationship of the air temperature, the hot air blower runs When the time h is fixed, it is expressed by the following conditional expression (3).

  On the other hand, when the hot air blower blowing temperature is fixed, the third relational expression is expressed by the following conditional expression (4).

Incidentally, the heating capacity W required for the hot air blower 3, the following conditional expression (5) is substituted with the air volume V ^HP balloon hot air blower 3, the floor temperature T ^C at the time of operation of the hot air blower 3 Is required.

  Based on the operating conditions of the hot air blower 3 determined as described above, the hot air blower control unit 51 controls the hot air blower 3.

  Subsequently, an example of incorporating the underfloor heating system according to the present invention into an actual house will be described. FIG. 3 is a top view of the foundation structure 100 as seen from a floor plate portion of a house to which the underfloor heating system is applied. The foundation structure 100 is constructed of foundation concrete 101 and soil concrete 102, and a space under the floor 12 corresponding to the height of the foundation concrete 101 is formed. The space under the floor 12 is divided into a plurality of underfloor spaces in accordance with the size of the living room. Here, when viewed from the center of the house, the first underfloor space 121 in the northwest to west direction, the second underfloor space 122 in the southwest direction, the third underfloor space 123 in the southeast direction, the fourth underfloor space 124 in the east direction, and the northeast direction An example in which a fifth underfloor space 125 is provided is shown.

  This 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 opening, and the underfloor space 12 is a closed space. Although illustration is abbreviate | omitted, the heat insulating material is affixed around the foundation concrete 101, and heat insulation is given. On the other hand, the basic concrete 101 that divides the first to fifth underfloor spaces 121 to 125 is provided with communication portions W1 to W5, and the first to fifth underfloor spaces 121 to 125 are provided via the communication portions W1 to W5. Are in communication with each other. The communication portions W1 to W5 are also used as a passage for workers during maintenance of the underfloor space 12 or the like.

  In such a basic structure 100, the first underfloor space 121 includes the first heat storage unit 2A and the second heat storage unit 2B, the heat pump air conditioner 30 (warm air blower), the first blower fan 4A, and the second blower fan. 4B (blower) is installed. Note that an outdoor unit (not shown) is provided for the heat pump air conditioner 30. The hot air generated by the heat pump air conditioner 30 is guided to the first heat storage unit 2A and the second heat storage unit 2B by the first duct 31A and the second duct 31B, respectively. In addition, the wind generated by the first blower fan 4A and the second blower fan 4B is guided to the first heat storage unit 2A and the second heat storage unit 2B by the third duct 41A and the fourth duct 41B, respectively.

  4 is a cross-sectional view of the first heat storage unit 2A (the second heat storage unit 2B has the same structure) as viewed from above, and FIG. 5 is a cross-sectional view as viewed from the side. The first heat storage unit 2A includes a plurality of thin heat storage plates 22, 22,... Made of a sensible heat storage body in a housing 21.

  The housing | casing 21 is a housing | casing which each cylinder shape of a cross-section rectangle has the entrance side 21T and the exit side 21E opened. A chamber 23 connected to the outlet side of the first duct 31A (second duct 31B) and the third duct 41A (fourth duct 41B) is closely attached to the inlet side 21T. Therefore, the warm air from the heat pump air conditioner 30 and the wind from the first blower fan 4A are introduced into the inlet side 21T of the housing 21 through the space 23H in the chamber 23 without leakage.

As the heat storage plate 22, for example, a sensible heat storage body such as a concrete block, brick, or mortar formed into a flat plate shape is used. As a commercially available product, for example, a sensible heat storage material “Peolite” manufactured by Inter Central Corporation can be used. Examples of physical properties of the sensible heat storage body that can be suitably used in the present embodiment are density = 3750 kg / m ³ , specific heat = 954 J / kgK, thermal conductivity = 2.7 W / mk, and surface area ratio = 1.5. is there.

  As shown in FIG. 4, a plurality of such heat storage plates 22 are arranged in parallel on the same plane, and as shown in FIG. 5, the parallel arrangement body 22L is formed in a plurality of layers at intervals to become the air passage 21H. Are stacked. Note that a rack (not shown) is assembled in the housing 21 in order to allow such heat storage plates 22 to be arranged in parallel or in multiple layers.

  Since the first heat storage unit 2A has such an internal configuration, when hot air from the heat pump air conditioner 30 is introduced from the inlet side 21T to the housing 21, the hot air passes through the air passage 21H. The heat of the warm air is given to each heat storage plate 22, and the heat storage plate 22 stores heat. And the warm air after heat exchange blows off from the exit side 21E of the housing | casing 21 to the 1st underfloor space 121, and heats the 1st-5th underfloor spaces 121-125.

  On the other hand, when normal temperature wind is introduced from the inlet side 21T to the housing 21 from the first blower fan 4A in a state where each heat storage plate 22 is stored, when the wind passes through the air passage 21H, the heat storage plate 22 Gives heat to dissipate. As a result, the wind at room temperature at the time of introduction becomes warm air and is blown out from the outlet side 21E of the housing 21 to the first underfloor space 121 to heat the first to fifth underfloor spaces 121-125.

  Returning to FIG. 3, as described above, the hot air F <b> 1 and the second heat storage unit 2 </ b> B generate hot air F <b> 1 and F <b> 2 from the first underfloor space by the operation of the heat pump air conditioner 30 or the first and second blower fans 4 </ b> A and 4 </ b> B. Each is blown out to 121. Thereafter, the hot air F1 and F2 are convected in the first underfloor space 121 and also convected (circulated) to other underfloor spaces, that is, the second to fifth underfloor spaces 122 to 125 through the communication portions W1 to W5. In the present embodiment, in order to promote the convection of the hot air F1, F2, an example is shown in which auxiliary fans 71, 72 composed of small fans or the like are arranged in the communication portions W1, W2.

  The operation of the heat pump air conditioner 30 is controlled by a control unit similar to the hot air blower control unit 51 (FIG. 2) described above. The operation of the first blower fan 4 </ b> A and the second blower fan 4 </ b> B is controlled by a control unit similar to the blower control unit 51. And as the operating condition, the operating condition determined by the above-mentioned formulas (1) to (5) is selected.

  As described above, in order to express the present invention, the present invention has been described appropriately and sufficiently through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this can be done. Accordingly, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not limited to the scope of the claims. To be construed as inclusive.

It is a figure which shows roughly the application state to the house H of the underfloor heating system which concerns on embodiment of this invention. It is a block diagram which shows the electric constitution of an underfloor heating system. It is the top view of the foundation structure which removed and looked at the floor board part of the house where the underfloor heating system was applied. It is sectional drawing of the upper surface view of a thermal storage unit. It is sectional drawing of the side view of a thermal storage unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Living room 12 Underfloor 13 Floor board 14 Outer wall 2, 2A, 2B Thermal storage unit 22 Thermal storage plate 3 Hot air blower 30 Heat pump air conditioner (hot air blower)
4 Blowers 4A, 4B 1st blower fan, 2nd blower fan (blower)
5 Control part 51 Hot air blower control part 52 Blower control part H House (basic heat insulation house)

Claims (7)

An underfloor heating system applied to a basic heat insulation house with a closed space under the floor of a living room,
A sensible heat storage body disposed in the underfloor space;
A warm air blower for storing heat by blowing warm air on the sensible heat storage body; and
A control unit capable of controlling operating conditions including the blowing air volume, blowing temperature and operating time of the hot air blower,
The operating conditions are:
A first relational expression showing a heat balance of the living room when the hot air blower is in operation, assuming that heat supply to the living room is performed only from under the floor;
Based on the heat balance, it is derived from a second relational expression indicating a target underfloor temperature for setting the room to a predetermined set temperature in a state where the hot air blower is operated at a predetermined outside air temperature,
Necessary for achieving the target underfloor temperature when it is assumed that the sensible heat storage body is heated at the blowout temperature of the hot air blower and heat is supplied to the underfloor during operation of the hot air blower. An underfloor heating system, which is a relational expression indicating the amount of heat, and is determined based on a third relational expression including the blown air volume, the blowing temperature, and the operation time as variables.   The underfloor heating system according to claim 1, further comprising a blower that promotes heat dissipation of heat stored in the sensible heat storage body by blowing air to the sensible heat storage body in a heat storage state. The underfloor heating system according to claim 1 or 2, wherein the first relational expression is a conditional expression of the following (1).

The underfloor heating system according to claim 3, wherein the second relational expression is a conditional expression of the following (2).

The underfloor heating system according to claim 4, wherein the third relational expression is a conditional expression of the following (3) when the hot air blower operating time h is fixed.

The underfloor heating system according to claim 4, wherein the third relational expression is a conditional expression of the following (4) when the hot air blower blowing temperature is fixed.

  The underfloor heating system according to any one of claims 1 to 6, wherein the control unit operates the hot air blower during a nighttime electric power time zone.

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