JP2016056980A - Ventilation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation system capable of properly performing ventilation of a room through a year, even in a case of reducing the number of temperature sensors.SOLUTION: A ventilation system includes a mechanical air supply device 34 forcibly feeding outside air from an air supply port 32 provided in a habitable room 121 of a building 1 into the habitable room 121, and a temperature sensor 62 provided in an attic space 130 of the building 1 and detecting the temperature of the attic space 130. A control device 5 controls operation and stop of the mechanical air supply device 34 according to the temperature detected by the temperature sensor 62, thereby to switch between mechanical air supply and natural air supply.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a ventilation system, and more particularly to a ventilation system for a one-story or multi-storey building.

  In general buildings such as houses, either a first type ventilation system or a third type ventilation system is often employed. In the first type ventilation system, both supply and exhaust are performed by a machine. On the other hand, in the third type ventilation system, only the exhaust is performed by a machine, and the indoor side is set to a negative pressure, so that the outside air is naturally supplied.

  In the third type ventilation system, the amount of ventilation varies depending on the season because it is affected by the temperature difference between indoor and outdoor. Therefore, Japanese Patent Laid-Open No. 2000-356384 (Patent Document 1) proposes a continuous ventilation system that adjusts the opening of a natural ventilation opening provided on the first floor of a building according to a temperature difference between indoor and outdoor. Further, in this continuous ventilation system, an air supply fan that always operates is provided on the second floor of the building, and the first-class ventilation system is adopted only on the second floor.

  Furthermore, the following ventilation system (structure) is also known. In JP2013-124815A (Patent Document 2), in a house provided with an air supply device and a natural exhaust port on the first and second floors of a building, the operation and stoppage of the air supply device are caused by a temperature difference between indoor and outdoor. It is disclosed to be done. Moreover, as a ventilation structure of a house, an outside air introduction device is installed in the ceiling space between the first floor space and the second floor space in Japanese Patent Laid-Open No. 2002-71186 (Patent Document 3). It is disclosed that air is allowed to flow into the first floor space and the second floor space through each vent.

JP 2000-356384 A JP2013-124815A JP 2002-71186 A (Patent No. 3488921)

  The type 3 ventilation system is more advantageous than the type 1 ventilation system in terms of cost (initial cost and running cost), while air supply by gravity ventilation is desired on the upper floor (2nd floor and above) of the building. hard. In order to deal with such a problem, as described above, Patent Document 1 proposes a combined ventilation system in which the first floor part of the building is the third type ventilation system and the second floor part is the first type ventilation system. ing. However, from the viewpoint of running cost and energy saving, it is desirable to ventilate the upper floor with natural air supply as much as possible.

  On the other hand, Patent Document 2 discloses that an air supply device is provided on both the first floor and the second floor of a building, and mechanical air supply by the air supply device is performed only when necessary. However, whether or not the air supply device needs to be operated is determined based on the temperature difference between indoor and outdoor. Therefore, the ventilation system of Patent Document 2 requires temperature sensors both indoors and outdoors.

  In addition, since the outdoor air temperature detected by the temperature sensor installed outdoors is directly affected by solar radiation, it is desirable to take sufficient sun protection measures, such as putting a temperature sensor in the 100-leaf box. Low practicality.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ventilation system capable of performing indoor ventilation appropriately throughout the year even if the number of temperature sensors is reduced. Is to provide.

  A ventilation system according to an aspect of the present invention is a ventilation system for performing ventilation in a building, and includes a mechanical air supply device, a temperature sensor, and control means. The mechanical air supply device forcibly sends outside air into the living room from an air supply port provided in the living room of the building. The temperature sensor is provided in the attic space of the building and detects the temperature of the attic space. The control means switches between mechanical air supply and natural air supply by controlling operation and stop of the mechanical air supply device in accordance with the temperature detected by the temperature sensor.

  Preferably, the temperature sensor is provided in an area of ½ or less of the height dimension of the cabin space.

  Preferably, the control means operates the mechanical air supply device only when the temperature detected by the temperature sensor is lower than a predetermined temperature.

  In addition, when the temperature detected by the temperature sensor becomes equal to or higher than a predetermined temperature during the operation of the mechanical air supply device, the control means operates the mechanical air supply device until a predetermined time elapses. It is desirable to continue.

  Preferably, the ventilation system further includes a mechanical exhaust device for forcibly sucking and exhausting air from a suction port provided in a non-residential room of the building. In this case, it is desirable that the control means always operates the mechanical exhaust device.

  Preferably, the building has a plurality of floors, and the air supply port is provided in a living room below the attic space located on the upper floor of the building. In this case, the ventilation system is preferably provided in a room on the first floor of the building, and further includes an air supply opening for naturally supplying outside air into the room.

  According to the present invention, since the temperature difference between the inside and outside is replaced by the temperature of the attic space, even if the number of temperature sensors is reduced, indoor ventilation can be appropriately performed throughout the year.

It is a figure which shows typically schematic structure of the ventilation system of the building which concerns on embodiment of this invention. It is a block diagram which shows the function structure of the ventilation system which concerns on embodiment of this invention. It is a graph which shows the correlation with internal / external temperature difference and a cabin back temperature. It is a graph which shows the temperature difference of a cabin back temperature and outside temperature. In embodiment of this invention, it is a flowchart which shows the air supply switching process which a control apparatus performs. It is a figure which shows typically the shed space of a building. It is a graph which shows typically the influence of measurement accuracy at the time of changing a measurement position in a horizontal direction in a shed space. It is a graph which shows typically the influence of the measurement accuracy at the time of changing a measurement position to the perpendicular direction in a shed space. It is a figure which shows typically the flow of the air in the building which employ | adopted the general 3rd type ventilation system. It is a figure which shows typically the pressure concerning the wall body of a building in winter.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  The ventilation system according to the embodiment of the present invention can perform both natural air supply and mechanical air supply at least on the upper floor in order to ventilate a multi-story building (for example, two stories). It has a hybrid air supply unit.

  Prior to the description of the schematic configuration of the ventilation system according to the present embodiment, first, referring to FIG. 9 and FIG. 10, in the building 100 adopting a general third type ventilation method (natural air supply, mechanical exhaust). The air flow will be briefly described.

  The building 100 has, for example, two floors, and has a living room 111 and a non-living room 112 on the first floor, and a living room 121 and non-living rooms 122 and 123 on the second floor (upper floor). On the first floor of the building 100, an air supply opening 21 is provided in the living room 111, and an exhaust fan (mechanical exhaust device) 22 is provided in the non-living room 112. Similarly, on the second floor, an air supply opening 300 is provided in the living room 121, and an exhaust fan 400 is provided in the non-living room 123. Each of the air supply openings 21 and 300 is provided so as to penetrate the outer wall of the building 100, and takes in outside air and naturally supplies air into the living rooms 111 and 121. The air supply openings 21 and 300 are generally provided in the upper part of wall bodies (outer walls) constituting the living rooms 111 and 121.

  In such a third type ventilation system, ideally, outside air is naturally supplied to the rooms 111 and 121 on each floor by always operating the exhaust fans 22 and 400 and setting the indoor side to a negative pressure. Further, as indicated by arrows F1 and F2 in FIG. 9, the air in the living rooms 111 and 121 flows to the non-housing rooms 112 and 122, respectively, and is mechanically exhausted from the non-housing rooms 112 and 122.

  In the building 100, the pressure applied to the wall body by the operation of the exhaust fans 22 and 400 is the same on the first floor and the second floor regardless of the season, as shown in FIG. On the other hand, since the temperature difference between the inside and outside varies depending on the season, the pressure applied to the wall varies depending on the season. As shown in FIG. 10 (A), in winter, the first floor portion of the building 100 has a greater pressure on the indoor side as it goes downward, and the second floor portion has a pressure on the outdoor side as it moves upward. .

  The pressure applied to the wall in winter is a combination of the pressure shown in FIG. 10 (A) and the pressure shown in FIG. 10 (B). Therefore, in the winter season, on the second floor of the publicly known building 100, as shown by the arrow F3 in FIG. In such a case, it is difficult for fresh outside air to be supplied from the air supply opening 300 to the second-floor room 121.

  On the other hand, the ventilation system according to the present embodiment includes a hybrid air supply unit that can supply mechanical air only when necessary in order to always supply fresh outside air to the second-floor room 121 of the building 1. We are going to prepare.

(About schematic configuration)
With reference to FIG. 1, schematic structure of the ventilation system of the building 1 which concerns on this Embodiment is demonstrated. The basic structure of the building 1 itself is the same as that of the known building 100 shown in FIG. That is, the building 1 has a living room 111 and a non-living room 112 on the first floor, and a living room 121 and non-living rooms 122 and 123 on the second floor (upper floor). The non-living room 122 on the second floor is, for example, a corridor, and the non-living room 112 on the first floor and the non-living room 123 on the second floor are, for example, toilets.

  As shown in FIG. 1, for ventilation on the first floor of the building 1, the air supply opening 21 provided in the living room 111 and the exhaust fan 22 provided in the non-living room 112, as in the known building 100, Is used. This is because the first floor of the building 1 can be properly ventilated throughout the year even if it is a third type ventilation system. The air supply opening 21 is provided in the upper part of the sash 113, for example.

  Note that the opening of the air supply opening 21 may be adjusted by a temperature difference between indoor and outdoor, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-356384 (Patent Document 1). In this case, the opening degree of the air supply opening 21 is adjusted so as to be small in winter when the temperature difference between indoor and outdoor is large and large in summer and intermediate periods where the temperature difference between indoor and outdoor is small.

  On the other hand, the hybrid air supply unit 3 and the exhaust unit 4 are used for ventilation on the second floor of the building 1. When there are a plurality of living rooms 121 on the second floor, the hybrid air supply unit 3 is typically provided for each living room 121. The exhaust unit 4 is realized by, for example, a parent-child ventilation fan, and one exhaust unit 4 is provided for the plurality of non-living rooms 122 and 123.

  The hybrid air supply unit 3 is configured to force the outside air into the room 121 through the air inlet 31 for sucking outside air, the air inlet 32 located in the room 121, the vent pipe 33 connecting them, and the air inlet 32. And an air supply fan (mechanical air supply device) 34 for feeding into the air. The air supply fan 34 includes a motor and a fan driven by the motor, and the fan rotates when power is supplied to the motor.

  The hybrid air supply unit 3 is provided in the ceiling space of the living room 121, that is, in the shed space 130. In this case, the suction port 31 is located, for example, in the ceiling portion of the eaves near the living room 121, and the air supply port 32 is located on the ceiling of the living room 121. The air supply fan 34 is provided in the vicinity of the air supply port 32, for example. Since the air supply port 32 is provided in the ceiling of the living room 121, it does not depend on the position or size of the window 124.

  The exhaust unit 4 incorporates an exhaust fan 44 (not shown in FIG. 1) in a main body (housing) 40, and has a plurality of suction ports 41a and 41b located in the non-living rooms 122 and 123, respectively. The exhaust fan 44 also includes a motor and a fan driven by the motor. When the exhaust fan 44 is driven, the exhaust unit 4 sucks air from the suction ports 41 a and 41 b and mechanically exhausts the sucked air from the exhaust port 42. The exhaust port 42 is provided, for example, in an eaves back ceiling near the non-living room 123.

  The main body 40 of the exhaust unit 4 is a shed space 130, and is provided in the ceiling space of the non-living room 122. Therefore, the suction port 41b located in the ceiling of the non-living room 123 functions as a sub suction port. The exhaust unit 4 further includes a vent pipe 43 a that connects the suction port 41 b and the main body 40, and a vent pipe 43 b that connects the main body 40 and the exhaust port 42.

  The exhaust unit 4 is always operated in the same manner as the exhaust fan 22 on the first floor. On the other hand, the hybrid air supply unit 3 selectively performs either natural air supply or mechanical air supply depending on the season. Typically, the hybrid air supply unit 3 performs natural air supply during the warm season when the internal / external temperature difference is relatively small, and performs mechanical air supply only during the cold season when the internal / external temperature difference is relatively large.

  The exhaust unit 4 is controlled by the control device 5. The control device 5 may operate the exhaust fan 44 at any one of a plurality of operation intensities. In FIG. 1, an example is shown in which the control device 5 is provided in the cabin back space 130 and in the vicinity of the main body 40, but may be provided in the main body 40. In the present embodiment, the hybrid air supply unit 3 is also controlled by the control device 5 that controls the exhaust unit 4. Since the hybrid air supply unit 3 and the control device 5 (exhaust unit 4) are provided in the cabin space 130, the air supply fan 34 and the control device 5 can be connected by a cable.

(About functional configuration)
Next, the functional configuration of the ventilation system according to the present embodiment will be described with further reference to FIG.

  The ventilation system according to the present embodiment further includes a temperature sensor 62 and an operation unit 63 in addition to the above configuration. The operation unit 63 receives an instruction regarding the exhaust unit 4 from the user. The operation part 63 is provided on the wall surface of the non-living room 122 on the second floor, for example. The temperature sensor 62 will be described later.

  The control device 5 is connected to the temperature sensor 62 and the operation unit 63 by wire or wirelessly. The control device 5 includes a control unit 51 that performs various operations and processes, a storage unit 52 that stores various data and programs, and a time measuring unit 53 that performs a time measuring operation. The control unit 51 is realized by an arithmetic processing device such as a CPU (Central Processing Unit). The storage unit 52 stores a program for controlling the driving of the exhaust fan 44 and the air supply fan 34 in advance. Storage unit 52 is realized by a nonvolatile storage device such as a flash memory, for example. The timer 53 is a timer that measures time according to an instruction from the controller 51. Note that the timer 53 may be a clock that always measures the date and time.

  As described above, the control device 5 controls the exhaust air unit 4 and the hybrid air supply unit 3 provided for each room 121. Therefore, the control unit 51 includes an exhaust control unit 54 and an air supply control unit 55 as its functions. The detection signal from the temperature sensor 62 is input to the control unit 51 after being converted into a digital signal.

  The exhaust control unit 54 always operates the exhaust fan 44 while the power of the exhaust unit 4 is ON. The operation modes of the exhaust fan 44 include, for example, a weak exhaust mode and a strong exhaust mode. In this case, the exhaust control unit 54 switches the operation mode of the exhaust fan 44 in accordance with an instruction from the user received by the operation unit 63. Alternatively, the operation mode of the exhaust fan 44 may be switched based on a temperature (indoor temperature) detected by a temperature sensor (not shown) provided indoors in the building 1.

  The air supply control unit 55 controls the operation of the air supply fan 34 depending on whether the season is a cold season or whether the temperature difference between inside and outside is large. Specifically, the air supply fan 34 is operated only when the internal / external temperature difference is relatively large, and when the internal / external temperature difference is relatively small, the operation of the air supply fan 34 is stopped. However, in the present embodiment, the operation and stop of the air supply fan 34 are switched based on only the temperature detected by the one temperature sensor 62 without using the actual measurement value of the internal / external temperature difference.

  Here, as shown in FIG. 1, the temperature sensor 62 is provided in the attic space 130 of the building 1. That is, the temperature sensor 62 detects the temperature of the attic space 130 (hereinafter referred to as “the attic temperature”). Therefore, the air supply control unit 55 controls the operation and stop of the air supply fan 34 in accordance with the cabin back temperature detected by the temperature sensor 62.

  Thus, the reason for determining the air supply method (natural air supply, mechanical air supply) according to the attic temperature is based on the knowledge that the temperature difference between the inside and outside can be replaced (replaced) with the attic temperature. . This will be described with reference to the graph of FIG.

  In the graph of FIG. 3, the temperature difference (indoor temperature (Ti) −outdoor temperature (To)) is plotted on the vertical axis, and the cabin temperature “Ta” is plotted on the horizontal axis on the coordinate plane. Measurement data is plotted. As is clear from the results of this experiment, the larger the inside / outside temperature difference, the lower the attic temperature, and the smaller the inside / outside temperature difference, the higher the attic temperature, and there is a correlation between the inside / outside temperature difference and the attic temperature. There was found. Therefore, in this Embodiment, it replaces with a temperature difference inside and outside, and it is supposed that only a cabin back temperature is measured.

  When the air supply method is switched according to the cabin back temperature, the threshold value (set temperature) can be determined as follows based on the experimental results. For example, it is assumed that an internal / external temperature difference of 10 ° C. is a temperature (set temperature difference) at which the air supply method should be switched. In this case, in order to ensure the mechanical supply when the internal / external temperature difference is 10 ° C. or more, in the graph of FIG. 3, the maximum temperature of the hut temperature measured when the internal / external temperature difference is 10 ° C. or more (about 18 ° C.). Higher). That is, if the set temperature as the threshold is 20 ° C. and the air supply fan 34 is turned on when the cabin temperature is less than 20 ° C., the indoor environment on the second floor of the building 1 can be made good (safe). . This temperature (20 ° C.) is referred to as “set reference temperature”.

  On the other hand, if the air supply fan 34 is turned ON when the cabin back temperature is less than 20 ° C., the air supply fan 34 is not used when it is judged based on the internal / external temperature difference, but the air supply fan 34 is operated. There is a lot of time (portion surrounded by an ellipse C1 in FIG. 3). Therefore, it is conceivable to set the set temperature to a temperature (for example, 15 ° C.) lower than the set reference temperature (20 ° C.). If it does so, the useless driving | operation of the air supply fan 34 can be reduced, and energy saving property can be improved. However, when the set temperature is 15 ° C., on the contrary, when the air supply fan 34 is required to be operated when it is determined based on the difference between the internal and external temperatures, there is some time during which the air supply fan 34 is not operated (in FIG. 3, an ellipse C2). The enclosed part).

  This is because the roof temperature of the building 1 is exposed to solar radiation, which causes a phenomenon that the hut temperature rises higher than the outside air temperature during the day. In FIG. 4, the temperature difference (Ta−To) between the cabin back temperature and the outside air temperature is shown along the time axis. In the figure, the portion surrounded by a circle is a portion where the cabin temperature is higher than the outside air temperature due to the influence of solar radiation. In either case, the difference between the cabin back temperature and the outside air temperature is 5 ° C. or more at the peak.

  Therefore, in the present embodiment, the set temperature is set to 15 ° C., but the air supply fan 34 is not immediately stopped even when the cabin back temperature becomes 15 ° C. or higher during the operation of the air supply fan 34. , And set a time limit. That is, the operation of the air supply fan 34 is continued until a predetermined time (for example, 6 hours) elapses when the cabin back temperature is 15 ° C. or higher. As a result, in an indoor environment where the air supply fan 34 is required, it is possible to reliably provide mechanical air supply.

  The operation and stop of the air supply fan 34 may be realized by transmitting a power supply ON / OFF signal, or may be realized by transmitting an operation signal of the air supply fan 34.

(About operation)
Next, the operation of the hybrid air supply unit 3 will be described. The operation of the hybrid air supply unit 3 is controlled by the air supply control unit 55.

  FIG. 5 is a flowchart showing an air supply switching process performed by the air supply control unit 55. The air supply switching process shown in FIG. 5 is realized by the control unit 51 reading and executing a program stored in the storage unit 52. Note that at the start of this process, the supply fan 34 is in a stopped state.

  Referring to FIG. 5, air supply control unit 55 determines whether or not the cabin back temperature (Ta) is less than 15 ° C. based on a signal from temperature sensor 62 (step S1). If the cabin back temperature is less than 15 ° C. (YES in step S1), air supply fan 34 is operated (step S2). That is, the hybrid air supply unit 3 performs mechanical air supply. At the same time, the air supply control unit 55 turns on a flag indicating that the hybrid air supply unit 3 is performing mechanical air supply (step S3). Thereafter, after the current state (machine air supply) is continued for a certain time (for example, 10 minutes) (step S8), the process returns to step S1, and the hut temperature is determined again.

  On the other hand, if the cabin back temperature (Ta) is 15 ° C. or higher (NO in step S1), it is determined whether or not the flag is ON (step S4). That is, it is determined whether the hybrid air supply unit 3 is performing mechanical air supply. If the flag is ON (YES in step S4), it is determined whether or not the time when the cabin back temperature is 15 ° C. or higher continues for a predetermined time, that is, 6 hours or longer (step S5). If it has not continued for 6 hours or more (NO in step S5), the process proceeds to step S8, and the operation of air supply fan 34 is continued.

  On the other hand, if the time when the cabin back temperature is 15 ° C. or more continues for 6 hours or more (YES in step S5), the flag is turned off (step S6), and the operation of supply air fan 34 is stopped (step S7). ). That is, the hybrid air supply unit 3 switches the air supply method to natural air supply. Then, it progresses to step S8, and after returning the present state (natural air supply) for a fixed time, it returns to step S1.

  If it is determined in step S4 that the flag is not ON (step S4), that is, if it is determined that natural air is being supplied, the air supply fan 34 remains stopped (step S7). Proceed to step S8.

  As described above, according to the present embodiment, the air supply fan 34 is operated only when the cabin back temperature is lower than the predetermined temperature. Therefore, when gravity ventilation is possible, the indoor air is supplied by natural air supply. Can be ventilated. Therefore, the running cost can be reduced and the energy saving effect can be obtained as compared with the case where the second-floor room 121 is always mechanically supplied with air.

  Further, in the present embodiment, the set temperature (predetermined temperature), which is the determination criterion for the air supply method, is lowered from the above set reference temperature, and a time limit is provided, thereby improving the energy saving property and improving the energy saving performance. The environment can be maintained well.

  Further, since the air supply method can be determined only by the cabin back temperature, there is no need to provide temperature sensors both indoors and outdoors. In addition, as compared with the case where the temperature sensor is provided outdoors, the provision of the temperature sensor in the cabin space 130 eliminates the need for a separate sun protection measure.

  Further, since the control device 5 is also provided in the cabin space 130, the cable length can be shortened by installing a temperature sensor 62 in the vicinity of the control device 5. Note that the installation position of the temperature sensor 62 in the cabin space 130 is preferably determined in consideration of measurement accuracy. The relationship between the installation position of the temperature sensor 62 (that is, the measurement position of the cabin back temperature) and the measurement accuracy will be described with reference to FIGS.

  FIG. 6 is a diagram schematically showing the cabin space 130. The attic space 130 is an area surrounded by the top surface 131 of the ceiling on the top floor and the gable roof 132. The (maximum) height dimension L0 of the attic space 130 is, for example, about 2 m. The graph of FIG. 7 schematically shows the influence of measurement accuracy when the measurement position is changed in the horizontal direction. The graph of FIG. 8 schematically shows the influence of measurement accuracy when the measurement position is changed in the vertical direction. In these graphs, the horizontal axis represents the measured temperature of the central lower portion 130a of the attic space 130 (hereinafter referred to as “central lower temperature”), and the vertical axis represents the measured temperature of each part (position) in the attic space 130. On the plane, portions where measurement data obtained throughout the year are plotted are shown as regions.

  Referring to FIGS. 6 and 7, the difference between the temperature at the center lower portion is about ± 3 ° C. when the position 130b near the outer wall is the measurement position and the position 130c on the center side is the measurement position. ing. Therefore, the difference in the installation position of the temperature sensor 62 in the horizontal direction hardly affects the measurement accuracy, and it can be said that there is no practical problem.

  With reference to FIGS. 6 and 8, at a position 130d that is 600 mm higher than the ceiling upper surface 131, the difference from the center lower temperature is within about ± 3 ° C. However, at a position 130e that is 1200 mm higher from the ceiling upper surface 131, the error from the central lower temperature is large. Therefore, it is desirable to install the temperature sensor 62 at 600 mm or less from the ceiling upper surface 131. However, when a heat insulating material is disposed on the ceiling portion upper surface 131, the temperature sensor 62 is preferably disposed above the heat insulating material.

  Note that although the temperature sensor 62 may be installed at the same height depending on the height L0 of the attic space 130, the environment in the attic space 130, or the like, a difference in measurement accuracy may occur. May be provided at least in a region of ½ or less of the height dimension L0 of the cabin space 130.

  In the present embodiment described above, the functions of the exhaust control unit 54 and the air supply control unit 55 are realized by the single control unit 51 executing software. However, these functions may be realized by different hardware. In this case, the control device 5 may be dedicated to the exhaust unit 4 and a dedicated air supply control device (not shown) dedicated to the hybrid air supply unit 3 may be provided separately. Further, in such a case, an air supply control device may be provided for each hybrid air supply unit 3.

  In addition, the mechanical air supply is performed when the cabin back temperature is less than 15 ° C., which is lower than the set reference temperature. However, when the cabin back temperature is less than 20 ° C., which is the set reference temperature, the mechanical supply is controlled. May be simplified.

  Further, the “predetermined time” determined when the air supply fan 34 is shifted from the ON state to the OFF state is 6 hours for safety, but is not limited. However, the predetermined time is desirably 5 hours or longer.

  Further, in the present embodiment, the air supply fan 34 is only switched ON / OFF. However, as in the case of the exhaust fan 44, when the air supply fan 34 is in the ON state, a plurality of operation modes (at least weak supply) are provided. It may be operated in any one of the air mode and the strong air supply mode).

  In the above case, the operation mode of the air supply fan 34 may be linked to the operation mode of the exhaust fan 44. That is, if the operation mode of the exhaust fan 44 is the weak exhaust mode, the operation mode of the air supply fan 34 is set to the weak air supply mode, and if the operation mode of the exhaust fan 44 is the strong exhaust mode, the operation of the air supply fan 34 is performed. The mode may be a strong air supply mode. By controlling the supply fan 34 and the exhaust fan 44 in this way, the upper floor of the building 1 can be well ventilated.

  Alternatively, in the present embodiment, the first floor of the building 1 is the third type ventilation system, but the hybrid air supply unit 3 may also be used for supplying air to the room on the first floor. In such a case, the building may be a single floor.

  Alternatively, the exhaust on the floor where the hybrid air supply unit 3 is provided may be natural exhaust. That is, the exhaust fan 22 or 44 may not be provided, and a method similar to the second type ventilation may be employed. Even in such a case, ON / OFF of the air supply fan 34 can be controlled in accordance with the cabin back temperature.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1,100 Building, 3 Hybrid air supply unit, 4 Exhaust unit, 5 Control device, 21,300 Air supply opening, 22, 44, 400 Exhaust fan, 31, 41a, 41b Air intake port, 32 Air supply port, 33, 43a, 43b Ventilation pipe, 34 Air supply fan, 40 Body part, 42 Exhaust port, 51 Control part, 52 Storage part, 53 Timekeeping part, 54 Exhaust control part, 55 Air supply control part, 62 Temperature sensor, 63 Operation part, 111, 121 living room, 112, 122, 123 non-living room, 113 sash, 124 windows, 130 shed space, 131 ceiling top surface, 132 gable roof.

Claims (6)

A ventilation system for ventilating a building,
A mechanical air supply device for forcibly sending outside air into the living room from an air supply port provided in the room of the building;
A temperature sensor provided in the attic space of the building for detecting the temperature of the attic space;
A ventilation system comprising: control means for switching between mechanical air supply and natural air supply by controlling operation and stop of the mechanical air supply device in accordance with the temperature detected by the temperature sensor.   2. The ventilation system according to claim 1, wherein the temperature sensor is provided in an area of ½ or less of a height dimension of the attic space.   The ventilation system according to claim 1 or 2, wherein the control means operates the mechanical air supply device only when the temperature detected by the temperature sensor is lower than a predetermined temperature.   When the temperature detected by the temperature sensor becomes equal to or higher than the predetermined temperature during the operation of the mechanical air supply device, the control means is configured to supply the mechanical air supply until a predetermined time elapses. 4. A ventilation system according to claim 3, wherein the operation of the device is continued. The ventilation system further includes a mechanical exhaust device for forcibly sucking and exhausting air from a suction port provided in a non-residential room of the building,
The ventilation system according to any one of claims 1 to 4, wherein the control means always operates the mechanical exhaust device. The building is multi-storey,
The air supply opening is provided in a room below the shed space, located on the upper floor of the building,
The said ventilation system is a ventilation system in any one of Claims 1-5 further provided with the air supply opening part provided in the living room of the 1st floor of the said building, and naturally supplying external air in a living room.

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