JP2013117353A - Underfloor heat storage air-conditioning system, and energy-saving house including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an underfloor heat storage air-conditioning system that utilizes cold air generated in a heat-pump water heater, while exhibiting high cooling efficiency, thereby minimizing operation of an air conditioner during summer.SOLUTION: The underfloor heat storage air-conditioning system includes a heat storage means, a heat-pump water heater 7, cold-air introduction passages 51, 55, outside-air introduction passage, cooling air passages 20, 30 and an exhaust passage 52. During nighttime, cold air generated in the heat-pump water heater 7 is introduced to an underfloor space 4A to cool a heat storage means. During a daytime, the outside air introduced into the underfloor space 4A via the outside-air introduction passage is cooled by the heat storage means and used for cooling. The underfloor space 4A is formed of an inside space of solid foundation concrete 40 which is formed by surrounding all side surfaces and a bottom with concrete, in at least a lower half thereof. The most of the heat storage means is the foundation concrete 40. In a portion where the outside-air introduction passage and an exhaust passage 52 are arranged in parallel to each other, a heat-exchanging ventilator 6 is disposed to exchange heat of the outside-air introduced in daytime with the exhaust, to be supplied to the underfloor space 4A.

Description

  The present invention relates to an underfloor heat storage air conditioning system and an energy-saving house equipped with the same, and in particular, cool air generated by a heat pump hot water supply device is introduced into the underfloor space at night to store heat in the foundation concrete, and is introduced into the underfloor space during the day. The present invention relates to an underfloor heat storage air-conditioning system that cools the outside air with basic concrete and uses it for cooling, and an energy-saving house that can reduce the energy consumption for cooling.

  In recent years, technology development for realizing energy saving has been activated due to increasing eco-consciousness and demand for global warming countermeasures. For example, many energy-saving houses with excellent heat insulation performance and reduced energy consumption for air conditioning have been developed. ing. In addition, a heat pump type hot water supply apparatus that realizes a significant reduction in the amount of energy input by utilizing the heat of the atmosphere by means of heat exchange is also widely used.

  Furthermore, since a large amount of cold air is generated by exchanging heat with the atmosphere in the heat pump type hot water supply device described above, the cold air generated when the system is driven at night is introduced into the underfloor space and used as a heat storage means such as ground or foundation concrete. Japanese Patent No. 4180101 and Japanese Patent Application Laid-Open No. 2010-7991 are techniques that store heat (store negative heat) and cool the indoor air by introducing outside air into the under-floor space when the temperature rises during the daytime. Proposed in the gazette.

  However, as with these technologies, it is difficult to store heat efficiently by simply introducing cold air generated by hot water supply at night under the floor, and in addition, a large amount of outside air is simply introduced into the underfloor space during the day. Then, since the heat exchange with the heat storage means under the floor is not sufficiently performed, it is impossible to realize efficient cooling, and the operation of the air conditioner must be used together.

Japanese Patent No. 4180101 JP 2010-7991 A

  The present invention is intended to solve the above-described problem, and an underfloor thermal storage air conditioning system that uses cool air generated by a heat pump hot water supply apparatus realizes higher cooling efficiency than conventional air conditioning operation amount in summer. It is an issue to be able to minimize the above.

  Therefore, the present invention includes a heat storage means arranged under the floor, a heat pump hot water supply device, a cold air introduction passage for introducing cold air from the heat pump hot water supply device to the underfloor space, an outdoor air introduction passage for introducing outside air to the underfloor space, It has a cooling air passage for sending the cool air of each space to each room and using it for cooling, and an exhaust passage for discharging the air of each room, and the cold air generated by the operation of the heat pump water heater at night is under the floor In an underfloor heat storage air conditioning system that cools the heat storage means by introducing it into the space and cools the outside air introduced into the underfloor space through the outside air introduction passage during the day by the heat storage means and uses it for cooling each room. Is composed of the inner space of solid foundation concrete with at least the lower half surrounded by concrete on all sides and bottom, and most of the heat storage means is made of foundation concrete There is a heat exchange type ventilation device in the part where the outside air introduction passage and the exhaust passage are in parallel, and the outside air introduced during the day is exchanged with the exhaust before being sent to the underfloor space It has been characterized by that.

  In this way, by using solid solid foundation concrete with the sides and bottom surrounded by concrete as the heat storage means in the underfloor space, it was excellent in thermal conductivity while accumulating cold with large specific gravity in the inner space The temperature of the outside air is lowered by arranging a heat exchange type ventilation device that can efficiently store heat while cooling the material concrete in a short time and also exchanges heat with the exhaust in the outside air introduction passage. Thus, since the temperature difference from the heat storage means is reduced and then introduced into the underfloor space, the cooling air can be efficiently generated.

  Also, in this underfloor heat storage air conditioning system, the end side of the cold air introduction passage branches from the main pipe arranged in the underfloor space, and is arranged while extending sideways in close contact with the upper surface of the foundation concrete that becomes the bottom surface of the underfloor space It is composed of a plurality of metal branch pipes arranged so as to average the density, and cold air is ejected from a plurality of jet holes provided on the side surface of each branch pipe at night. The cold air can be introduced evenly over the entire area of the underfloor space, and the basic concrete can be directly cooled by the branch pipe cooled by the cold air.

  In this case, if the ejection hole is formed so that the cold air is ejected in a direction parallel to and / or obliquely with respect to the upper surface of the foundation concrete, the foundation is obtained by direct contact with the cold air. Cooling of concrete will proceed efficiently.

  Further, in the above-described one having a branch pipe on the end side of the cold air introduction passage, the cold air introduction passage also serves as the outside air introduction passage, and outside air is taken in from the outside air inlet of the heat pump hot water supply device during the day. The main pipe and the branch pipe are jetted into the underfloor space, and the branch pipe in a state where the outside air introduced into the underfloor space is cooled in close contact with the foundation concrete. Therefore, the cooling air can be efficiently generated in a short time.

  Furthermore, in the case where the cold air introduction passage also serves as the outside air introduction passage, the heat exchange type ventilator has a function of switching the internal outside air passage to a bypass route that does not exchange heat with the exhaust. When the outside air introduction passage is used as the cold air introduction passage, the operation can be performed in a state where heat is not exchanged between the cold air and the exhaust gas by switching to the bypass route by a predetermined operation or a preset setting. In this case, when introducing cool air from the heat pump hot water supply device to the underfloor space, it is possible to avoid cooling the exhaust and causing the temperature of the cool air to rise.

  Furthermore, in the case where the cold air introduction passage described above also serves as the outside air introduction passage, the base end side of the main cooling air passage is constituted by the branch pipe and the main pipe, and the air in the underfloor space is aired during the daytime cooling. Is supplied to each room through the inside of the branch pipe, because the air in the underfloor space is directly cooled in the branch pipe in a state of being cooled in close contact with the foundation concrete. Thus, the cooling air is generated more efficiently.

  In addition, it has a heat pump type hot water supply device, and at least the lower half of the underfloor space is composed of an inner space of solid basic concrete with all sides and bottom surrounded by concrete. If it is an energy-saving house provided with the above-described underfloor heat storage air-conditioning system, the amount of air-conditioner operation in summer can be minimized, and the energy-saving performance is extremely excellent.

  In this case, if the underfloor space is characterized in that a plurality of supporting columnar concretes are arranged at predetermined intervals and are not partitioned by a cloth foundation wall, the introduced cold air and outside air are It becomes easy to reach all parts of the space evenly, and it becomes more excellent in cooling efficiency.

  According to the present invention, which uses solid foundation concrete as the heat storage means, adjusts the temperature of the outside air by exchanging heat with the exhaust air and then cools it with the heat storage means, it achieves higher cooling efficiency than the conventional summer The amount of air conditioner operation can be minimized.

It is a longitudinal cross-sectional view which shows the structure of the energy saving house by the 1st Embodiment in this invention, and the state at the time of the summer night. It is a longitudinal cross-sectional view which shows the state in the summer daytime of the energy-saving house of FIG. It is a longitudinal cross-sectional view which shows the structure of the energy-saving house by 2nd Embodiment in this invention, and the state of the summer night. It is sectional drawing which follows the XX line of FIG. It is a longitudinal cross-sectional view which shows the state in the summer daytime of the energy-saving house of FIG. It is a longitudinal cross-sectional view which shows the structure of the energy-saving house by 3rd Embodiment in this invention, and the state of the summer night. It is a longitudinal cross-sectional view which shows the state in the summer daytime of the energy-saving house of FIG.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the present invention, heat storage includes both positive heat storage by heating and negative heat storage by cooling.

  FIG. 1 is a simplified vertical cross-sectional view for explaining the structure of an energy-saving house 1A provided with an underfloor heat storage air conditioning system according to a first embodiment of the present invention, and is a summer night state (when storing heat). Is shown. This energy-saving house 1A includes a heat pump type hot water supply device 7 that includes a hot water supply tank 70 and a heat exchanger (outdoor unit) 71 and generates heat for hot water supply by exchanging heat with the atmosphere.

  Moreover, in this energy-saving house 1A, in addition to the heat insulating material being disposed around the rooms 2 and 3 and the ceiling, the outer wall 9 has air passages 80 and 90 inside the roof 8 and the outer wall 9, respectively. The outside air that has entered from the inside of the lower end and has risen from the vent 82 opened in the wing is structured to be excellent in heat insulation and to keep the indoor temperature constant.

  Furthermore, in addition to the heat pump type hot water supply device 7 described above, the energy-saving house 1A includes cold air introduction passages 51 and 55 for introducing the cold air generated by the outdoor unit 71 to the underfloor space 4A, and outside air introduction for introducing outside air to the underfloor space 4A. Passage (common to the cold air introduction passage), the cooling air passages 20 and 30 for sending the cold air in the underfloor space 4A to the rooms 2 and 3 for cooling, and the air in the rooms 2 and 3 are discharged to the outside. The exhaust passages 21, 31, and 52 are provided to cool the heat storage means by introducing cool air generated by the operation of the heat pump hot water supply device 7 at night into the underfloor space 4A, and introduced into the underfloor space 4A during the day. An underfloor heat storage air-conditioning system that cools the outside air with heat storage means and uses it to cool the rooms 2 and 3 is provided. The above-described configuration is a well-known technique found in other energy-saving houses.

  And the energy-saving house 1A provided with the underfloor heat storage air-conditioning system according to the present invention, the underfloor space 4A is composed of an inner space of a solid basic concrete 40 in which at least the lower half is surrounded by concrete on all sides and upper surfaces. In addition, most of the heat storage means (preferably 80% or more of the heat storage amount) is due to the foundation concrete 40, and the cold air introduction passages 51 and 55 also serve as the outside air introduction passage, and the attic space 5 Thus, the heat exchange type ventilation device 6 is arranged in a portion where the exhaust passage 52 is in parallel with the cold air introduction passage 51, and heat is exchanged between the outside air introduced during the day and the exhaust to average the temperatures of both. Such a portion is a feature of the present invention.

  That is, concrete, which is a material with higher thermal conductivity than wood and soil, is used as a heat storage means of the underfloor heat storage air conditioning system and formed into a vessel shape, thereby securing a sufficient volume as a heat storage means. However, since cold air having a large specific gravity is introduced and accumulated in the inner space, the heat storage means can be efficiently cooled.

  In addition, the foundation concrete 40 has an advantage that it is easy to maintain a temperature lower than the outside air in the summer because the bottom surface is in contact with the ground 100 whose temperature is stable throughout the year. Further, the outside air to be cooled in the underfloor space 4A is preliminarily subjected to heat exchange with the exhaust gas and is lowered below the initial temperature, thereby enabling efficient cooling in the underfloor space 4A.

  In the present embodiment, as described above, the cold air introduction passages 51 and 55 that continue from the air intake port of the outdoor unit 71 also serve as the outside air introduction passage, and are used as the cold air introduction passage during operation of the heat pump hot water supply device 7 at night. However, when cooling during the daytime, the system is used as an outside air introduction passage. However, when the cooling air introduction passage is used, the main air blowing driving force is used as the fan of the outdoor unit 71, and the air blowing driving force when used as the outside air introduction passage. By making the main of the heat exchange type ventilator 6, it becomes easy to achieve both driving energy saving and efficient air blowing.

  The heat exchange type ventilator 6 is preferably a model having a function of switching to the bypass route 62 as shown by a broken line in the figure where the internal outside air passage does not exchange heat with the exhaust gas. When the outside air introduction passage is used as the cold air introduction passage, it is possible to switch to the bypass route 62 so that heat is not exchanged between the cold air and the exhaust, and the temperature rises before the cold air enters the underfloor space 4A. It can be avoided.

  Then, during operation of the heat pump type hot water supply device 7 at night in summer, the outside air taken in from the air intake port of the outdoor unit 71 is heat-exchanged by the internal heat exchanging means and becomes cold air (for example, around 15 ° C.). The air is introduced into the underfloor space 4 </ b> A through the introduction passage 51, the heat exchange type ventilation device 6 (preferably the bypass passage 62), and the cold air introduction passage 55.

  This underfloor space 4A is not partitioned by a cloth foundation wall, and has a configuration in which a plurality of supporting columnar concrete 41, 42,... Are arranged at predetermined intervals (similar to FIG. 4). The cold air is easy to spread all over. Then, the cool air introduced into the underfloor space 4A is used for cooling the foundation concrete 40, and the upper overflow portion (cool wind) in a state where the temperature is slightly raised passes through the cooling air passages 20 and 30 to each room 2, 3 is used for cooling at night, and then discharged to the outside through the exhaust passages 21, 31, the heat exchange ventilator 6, and the exhaust passage 52.

  FIG. 2 shows the summer daytime state of the energy-saving house 1A of FIG. The foundation concrete 40 as heat storage means constituting the inner surface of at least the lower half of the underfloor space 4A functions to cool the outside air introduced during the day to generate air for cooling, and the outside air is outdoor. Heat is exchanged between the exhaust air coming from the rooms 2 and 3 in the heat exchange type ventilator 6 through the cool air introduction passage 51 used as the outside air intake port of the machine 71 and the outside air introduction passage, and serves as the outside air introduction passage. It is introduced into the underfloor space 4A through the cold air introduction passage 55 to be used. Since the temperature is lower than that at the beginning at the time of introduction, it is easy to ensure an efficient cooling function.

  That is, for example, when the outside air is 32 ° C. and the room air is 27 ° C., both are averaged by the heat exchange ventilator 6 to adjust the exhaust to about 29 ° C. and the outside air (adjusted outside air) to about 30 ° C. Therefore, when it is introduced into the underfloor space 4A, it can be lowered to a temperature suitable for cooling (for example, 26 ° C.) in a relatively short time, so that high temperature (32 ° C.) outside air is introduced as it is. In comparison, the cooling function by the heat storage means is easily exhibited over a long period of time, and it is almost unnecessary to add an air conditioner operation.

  In this case, for a while from the start of cooling, the outside air (regulated outside air) is mixed with the cold air stored in the underfloor space 4A during the night as the cooling air through the cooling air passages 20 and 30. The air is supplied to each of the rooms 2 and 3, but after that, the introduced outside air is cooled by the basic concrete 40 and supplied as cooling air in order (cool wind), and the capacity of the basic concrete 40 is large and the temperature of the ground 100 is stable. In combination with this, the temperature of the rooms 2 and 3 is maintained in a comfortable state while exhibiting a cooling function for a long time.

  FIG. 3 shows an energy-saving house 1B provided with an underfloor heat storage air-conditioning system according to the second embodiment of the present invention, and FIG. 4 shows a cross-sectional view taken along the line XX of FIG. This energy-saving house 1B has almost the same basic configuration and function as the energy-saving house 1A described above, but the end side of the cold air introduction passage 56 is branched from the main pipe 57 arranged in the underfloor space 4B. As shown in FIG. 4, a plurality of metal branch pipes 57a, 57b,... 57k arranged by averaging the arrangement density while extending laterally so as to be in close contact with the upper surface of the foundation concrete 40 that becomes the bottom surface of the underfloor space 4A. , 57l so that cold air is jetted in a direction parallel to and / or obliquely with respect to the upper surface of the foundation concrete 40 from the blow holes 571 provided at predetermined intervals on the side surfaces of the branch pipes 57a,. It is characterized by.

  That is, as shown in FIG. 4, the underfloor space 4 </ b> B is not partitioned by the cloth foundation wall, and a plurality of supporting column concretes 41, 42,... Since the branch pipes 57a, 57b,... 57k, 571 cover the bottom surface on average and the cold air ejected from the respective ejection holes 571,. It is easy to spread all over.

  In addition to this, since the bottom surfaces of the branch pipes 57a,... In a state cooled by cold air are in close contact with the foundation concrete 40, the foundation concrete 40 is directly cooled and the ejection holes Cooling of the foundation concrete 40 is performed extremely efficiently by direct contact with the cold air ejected from 571.

  The branch pipes 57a,... Are preferably closed from the end in terms of ensuring the average jet pressure of the jet holes 571, and have a flat portion on the bottom surface of the foundation concrete. A material having a large contact area with the upper surface of 40 is suitable, and it is preferable to use a metal having excellent thermal conductivity such as aluminum or copper as the material from the viewpoint of cooling efficiency.

  FIG. 5 shows the state of the energy-saving house 1B in FIG. 3 during the summer day, but also in the present embodiment, the cold air introduction passages 51 and 56 also serve as the outside air introduction passage as described above. The main pipe 57 and the branch pipes 57a on the end side also serve as an outside air introduction passage. For this reason, the introduced outside air (adjusted outside air) is introduced from each ejection hole 571 through each branch pipe 57a,..., But passes through each branch pipe 57a,. After the outside air is directly cooled inside, it spreads uniformly in the underfloor space 4B, and by directly hitting the upper surface of the foundation concrete 40, the outside air is efficiently cooled and becomes air for cooling in a short time. , 3.

  FIG. 6 shows an energy-saving house 1C provided with an underfloor heat storage air-conditioning system according to a third embodiment of the present invention, and shows a state in the summer and night. This energy-saving house 1C also has the basic configuration and functions substantially the same as those of the energy-saving house 1B described above, but the base end side of the main cooling air passage 59 is constituted by branch pipes 57a,. The air in the underfloor space 4C is supplied to the rooms 2 and 3 through the branch pipes 57a,.

  That is, the function at the time of introducing cold air at night is the same as described above, and the cold air used for cooling the foundation concrete 40 is used for cooling at night through the secondary air passages 22 and 32 for cooling. In the daytime, as shown in FIG. 7, the outside air (adjusted outside air) introduced into the underfloor space 4C constitutes the base end side of the main cooling air passage 59 and is cooled by the foundation concrete 40, ... because it is cooled directly by passing through it, cooling air is generated more efficiently.

  In this case, the air passage 59 for cooling needs to be separately connected to the main pipe 57 as a separate body in parallel with the cold air introduction passage 58 that also serves as the outside air introduction passage as shown in the figure. It is possible to arrange a fan 60 separate from the heat exchanging ventilator 6 for sending air for cooling on the way and to blow air to the rooms 2 and 3 through the air passages 65 and 66 for cooling. This is preferable from the viewpoint of securing the blowing power of the cooling air.

  On the other hand, since the cooling air passage 59 is connected to the same main pipe 57 in parallel with the cooling air introduction passage 58 used as the outside air introduction passage, the introduced outside air flows into the cooling passage 59 as it is. There is also a worry. Therefore, as shown in the figure, the switching valve 61 is arranged in the parallel part of both, and the cooling air passage 59 is closed when the cold air is introduced at night (see FIG. 6). The switching valve 61 is switched during the daytime cooling. Thus, this problem can be solved by adopting a configuration in which the cooling air passage 59 is opened with the outside air introduction passage opened in the underfloor space 4C (see FIG. 7).

  As described above, the underfloor heat storage air-conditioning system of the present invention and the energy-saving homes 1A, 1B, and 1C having the same are excellent in energy-saving performance during cooling use in summer, but each configuration is used as it is. By doing so, it is possible to provide excellent energy saving performance and a comfortable living environment even during winter heating, and it is easy to ensure comfort in other seasons because air circulates in every corner of the room Has advantages.

  For example, by placing an air conditioner in the underfloor space and storing heat in the basic concrete with inexpensive electricity at midnight, the heating air introduced into the underfloor space and heated in other times is supplied to each room. In this case, it is possible to realize excellent heating efficiency in combination with the addition of a stable temperature due to the ground and the circulation of air in every indoor space including under the floor.

  As described above, the underfloor thermal storage air-conditioning system that uses the cold air generated by the heat pump hot water supply apparatus can achieve higher cooling efficiency than the conventional one and can minimize both summer air-conditioner operations. Became.

  1A, 1B, 1C Energy saving house, 2, 3 rooms, 4A, 4B, 4C Underfloor space, 6 Heat exchange type ventilator, 7 Heat pump type hot water supply device, 20, 22.30, 32, 59, 65, 66 Air for cooling Passage, 21, 31, 52 Exhaust passage, 40 Foundation concrete, 41, 42, 43, 44, 45, 46, 47, 48 Supporting columnar concrete, 51, 55, 56, 58 Cold air introduction passage, 57 Main piping, 57a , 57b, 57c, 57d, 57e, 57f, 57g, 57h, 57h, 57i, 57j, 57k, 57l Branch pipe, 61 selector valve, 62 bypass route, 100 ground, 571 outlet

Claims (8)

Heat storage means arranged under the floor, a heat pump hot water supply device, a cold air introduction passage for introducing cold air from the heat pump hot water supply device to the underfloor space, an outdoor air introduction passage for introducing outside air to the underfloor space, and the cold air in the underfloor space A cooling air passage for sending the air to each room and using it for cooling, and an exhaust passage for discharging the air in each room, and cool air generated by the operation of the heat pump hot water supply device at night under the floor An underfloor heat storage air conditioning system that cools the heat storage means by introducing it into a space, cools the outside air introduced to the underfloor space through the outside air introduction passage during the day by the heat storage means, and uses it for cooling each room. In
The underfloor space is composed of an inner space of solid basic concrete in which at least the lower half is surrounded by concrete on all sides and bottom, and most of the heat storage means is made of the basic concrete, and The outside air introduction passage and the exhaust passage have a heat exchange type ventilation device in parallel, and the outside air introduced during the day is exchanged with the exhaust and then sent to the underfloor space. Underfloor thermal storage air conditioning system.   The end side of the cold air introduction passage is branched from a main pipe arranged in the underfloor space, and the arrangement density is averaged while extending sideways in close contact with the upper surface of the foundation concrete that becomes the bottom surface of the underfloor space. 2. A plurality of metal branch pipes arranged at the same time, wherein cold air is jetted from a plurality of jet holes provided on a side surface of each branch pipe at night. Underfloor heat storage air conditioning system described in 1.   The underfloor thermal storage air conditioning system according to claim 2, wherein the ejection holes are formed so that cold air is ejected in a direction parallel to and / or obliquely with respect to the upper surface of the foundation concrete. The cold air introduction passage also serves as the outside air introduction passage, and outside air is taken in from the outside air intake port of the heat pump hot water supply device during the day, and is ejected to the underfloor space through the main pipe and the branch pipe. The underfloor thermal storage air conditioning system according to claim 2 or 3.   The heat exchange type ventilator has a function of switching an internal outside air passage to a bypass route that does not exchange heat with exhaust, and when the outside air introduction passage is used as the cold air introduction passage at night, a predetermined amount is used. The underfloor heat storage according to claim 4, wherein the operation in a state in which heat is not exchanged between the cold air and the exhaust is enabled by switching to the bypass route by an operation or a prior setting. Air conditioning system.   The base end side of the main air passage for cooling is composed of the branch pipe and the main pipe, and the air in the underfloor space is supplied to the rooms through the branch pipe during cooling during the day. The underfloor heat storage air-conditioning system according to claim 4 or 5.   The heat pump type hot water supply apparatus is provided, and at least the lower half of the underfloor space is configured by a solid inner space of the foundation concrete in which all side surfaces and bottom surfaces are surrounded by concrete. An energy saving house comprising the underfloor heat storage air conditioning system according to claim 1, 2, 3, 4, 5 or 6.   The energy-saving house according to claim 7, wherein a plurality of supporting columnar concretes are arranged at predetermined intervals in the underfloor space and are not partitioned by a cloth-based wall.

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