JP2005140479A - Nighttime ventilation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nighttime ventilation system capable of cooling air inside a building, a roof, a wall, a floor or the like by nighttime cold air even without a hollow layer in the wall of the building of a factory or the like, positively cooling equipment installed inside the building, and efficiently exerting cooling effect to solve a problem of moisture or dew condensation. <P>SOLUTION: This nighttime ventilation system has: an air supplying fan 5 provided in a first side wall 3a of the building 1; an exhausting fan 6 provided in a second side wall 3b opposite to the first side wall 3a; and a fan operation controller 8 starting air supply/exhaust operation of the respective fans 5, 6 in the night, and stopping the air supply/exhaust operation of the respective fans 5, 6 nearly at dawn. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention provides a night ventilation system with an energy saving configuration that can cool an indoor space of a building such as a factory with night cold air to reduce the cooling load at the start of work and during the day and reduce the power consumption of the cooling equipment. It is about.

In factories, etc., especially in the summer, the amount of solar radiation from the roof and walls increases during the day, and the temperature inside the factory rises due to heat generated from the equipment. The thermal environment is adjusted. However, the operating cost of the cooling device is quite large, and it is necessary to reduce the operating rate of the cooling device as much as possible to reduce the operating cost of the cooling device.
For example, in a building exterior building material that has been dry-typed, a hollow layer formed by a dry-type construction bracket is provided between the building wall and the exterior tile surface, and the air in this hollow layer is forcibly ventilated by a ventilation fan, A ventilation system for a hollow layer of an outer wall building material is disclosed in which the ventilation fan is operated by judging a temperature difference between indoor, hollow layer and outside air.

  In this system, the nighttime cool air is passed through the hollow layer with a ventilation fan, and the indoor temperature is lowered to near the outside air temperature, thereby reducing the cooling load after the start of building use and improving the operating rate of the cooling operation. This is intended to reduce the cost of cooling operation (for example, see Patent Document 1).

JP-A-5-79102 (first page-second page, FIG. 1)

  However, the walls of factories and the like are often not hollow layers, may be clogged with heat insulating materials, and the width of the hollow layer may be small. Moreover, in the system shown in Patent Document 1, a large fan is required to increase the ventilation air volume of the ventilation fan, and in this case, the initial cost and running cost of the ventilation fan are increased. Furthermore, there are many devices that generate heat and non-heaters inside the factory, and ventilation with only the hollow layer does not directly apply cold air to these devices, making it difficult to lower the temperature of the devices in a short time.

  The present invention has been made to solve the above-described problems. Even if there is no hollow layer on the wall of a building such as a factory, the air, roof, walls, floors, etc. in the building are cooled by cold air at night. Night ventilation system that can actively cool the equipment installed in the building, and can effectively exhibit cooling drop to eliminate moisture and condensation problems The purpose is to provide.

  A night ventilation system according to the present invention includes an air supply fan provided on a first side wall of a building, an exhaust fan provided on a second side wall opposite to the first side wall, and each fan at night. A fan operation control device for starting the air supply / exhaust operation and stopping the air supply / exhaust operation of each of the fans almost at dawn is provided.

  In addition, an air supply fan provided on the first side wall of the building, an air supply side temperature sensor provided in the vicinity of the intake port of the air supply fan to detect the outside air temperature, and a first facing the first side wall. The exhaust fan provided on the side wall 2 and the supply / exhaust operation of each fan when the supply / exhaust operation of each fan starts at night and the outside air temperature detected by the temperature sensor changes from the lowered state to the raised state Is provided with a fan operation control device for stopping the operation.

  Furthermore, an air supply fan provided on the first side wall of the building, an air supply side temperature sensor provided in the vicinity of the intake port of the air supply fan to detect the outside air temperature, and the vicinity of the intake port of the air supply fan A supply-side humidity sensor for detecting the outside relative humidity, an exhaust fan provided on the second side wall opposite to the first side wall, and supply / exhaust operation of each fan at night is started to Supply / exhaust of each fan when the outside air temperature detected by the air side temperature sensor changes from a lowered state to a rising state, or when the outside air relative humidity detected by the air supply side humidity sensor exceeds a set value. A fan operation control device for stopping the operation is provided.

  In addition, an air supply fan provided on the first side wall of the building, an air supply side temperature sensor provided in the vicinity of the intake port of the air supply fan to detect the outside air temperature, and a first facing the first side wall. 2, an exhaust fan provided on the side wall, an exhaust side temperature sensor provided in the vicinity of the suction port of the exhaust fan or in the building, and supply / exhaust operation of each fan at night is started and the supply side temperature sensor The air supply / exhaust operation of each fan is stopped when the outside air temperature detected by the engine changes from the lowered state to the raised state, or when the detected temperature detected by the exhaust-side temperature sensor changes from the lowered state to the raised state. A fan operation control device is provided.

  Furthermore, an air supply fan provided on the first side wall of the building, an air supply side temperature sensor provided in the vicinity of the intake port of the air supply fan to detect the outside air temperature, and the vicinity of the intake port of the air supply fan An air supply side humidity sensor for detecting the relative humidity of the outside air, an exhaust fan provided on the second side wall facing the first side wall, and in the vicinity of the suction port of the exhaust fan or in the building When the outside air temperature detected by the air supply side temperature sensor and the air supply side temperature sensor from the descending state rises from the descending state, the exhaust side temperature sensor detects the exhaust side temperature sensor. The supply / exhaust operation of each fan is stopped when the detected temperature is changed from the lowered state to the raised state, or when the outside air relative humidity detected by the air supply side humidity sensor exceeds a set value. Those having a § down operation controller.

According to the night ventilation system according to the present invention, the indoor space of the building can be cooled by the cold air at night, even if there is no hollow layer on the wall of the factory or the like, and the indoor equipment is positively Can be cooled.
Further, since the air supply fan and the exhaust fan are controlled using the fan operation control device provided with a timer, an efficient operation can be performed.
In addition, it is possible to detect the condition of the outside air with the air supply side humidity sensor, and if there are products that dislike moisture inside the building, it is possible to prevent each fan from operating, so install it in buildings of all industries Is possible.

[Embodiment 1]
FIG. 1 is a front view for explaining a night ventilation system according to Embodiment 1 of the present invention, and FIG. 2 is a side view of FIG. As shown in the figure, a building 1 such as a factory is provided with a roof 2, side walls 3a, 3b, 3c, 3d, and a floor 4. For example, air is sucked into the upper portion of the side wall 3a and blown out in the horizontal direction. A fan 5 (5a, 5b) is installed, and an exhaust fan 6 is installed on the upper part of the side wall 3b positioned relative to the side wall 3a. There are a plurality of devices 7 inside the building 1, and a fan operation control device 8 having a timer for controlling the operation of the air supply fan 5 and the exhaust fan 6 is attached to the lower part of the indoor side wall 3a. Furthermore, a cooling device 9 is installed in the building 1.
An air flow a is formed inside the building 1 when the air supply fan 5 and the exhaust fan 6 are driven.

  The operation of the present embodiment configured as described above will be described. If the fan operation control device 8 provided with a timer is set at night, for example, around 1 am, the supply fan 5 and the exhaust fan 6 are operated by the fan operation control device 8 at this time. The cold air outside the building 1 that has fallen in temperature at night is taken into the building 1. The cold air taken into the building 1 is blown out in a substantially horizontal direction b and diffused to cool the indoor air, the roof 2, the side walls 3, the floor 4 and the equipment 7 in the building 1 and approach the outside air temperature before exhausting. It is discharged from the building fan 6 to the outside of the building 1 again. If a timer is set at dawn, for example, from 5 am to 6 am, the fan operation control device 8 stops the operation of the supply fan 5 and the exhaust fan 6 at this time.

In this way, in order to cool the inside of the building 1 by introducing night air outside the building 1, the cooling equipment is not operated from the start of work until the required cooling allowable temperature of the air in the building 1, for example, about 28 ° C to 30 ° C. In other words, it is possible to lower the cooling operation operating rate, lower the operating cost of the cooling equipment, and achieve energy saving.
Even if only the air supply fan 5 or the exhaust fan 6 is used as the fan, the present system is established. However, when the building 1 is a factory or the like, there are openings and gaps everywhere. It is desirable to combine the intake fan 5 and the exhaust fan 6 so that the flow of cold air flows through the building 1 as evenly as possible.

[Embodiment 2]
FIG. 3 is a front view for explaining a night ventilation system according to Embodiment 2 of the present invention, and FIG. 4 is a side view of FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the present embodiment, an air supply side temperature sensor 10 and an air supply side humidity sensor 11 are attached to the outer wall side of the side wall 3 a in the vicinity of the air supply fan 5, and on the inner wall side of the side wall 3 b in the vicinity of the exhaust fan 6. An exhaust-side temperature sensor 12 is attached, and a fan operation control device 8a having a timer is attached to the lower part of the indoor side wall 3a.

  In the first embodiment, the air supply fan 5 and the exhaust fan 6 are periodically operated by an operation timer. However, in the present embodiment, the one manufactured in the building 1 does not like moisture or condensation. In some cases, the supply air temperature sensor 10 and the supply air humidity sensor 11 on the supply air fan 5 side detect the temperature and relative humidity of the outside air, and the fan operation control device 8a determines whether the fan operation is possible. Further, the exhaust temperature is detected by the exhaust side temperature sensor 12 on the exhaust fan 6 side, and the fan is efficiently operated by the fan operation control device 8a.

  The operation of the present embodiment configured as described above will be described. If a timer provided in the fan operation control device 8a is set, for example, at about 1 am, the supply fan 5 and the exhaust fan 6 start operation at this time, but the outside air In the case of high humidity or when there is a cooling object in the building 1 causing condensation, the fan operation is stopped. Further, the temperature inside the building 1, that is, the temperature is detected by the exhaust-side temperature sensor 12 on the exhaust fan 6 side.

  FIG. 5 is an operation control block diagram of the entire system. As shown in the figure, the temperature and relative humidity information recognized by the supply side temperature sensor 10, the supply side humidity sensor 11, and the exhaust side temperature sensor 12 is sent to the fan operation control device 8a having a timer, Further, the air supply fan 5 and the exhaust fan 6 are operated by a command from the control device 8a.

FIG. 6 is a flowchart of the operation control of the air supply and exhaust fans 5 and 6, and the operation control of the fans 5 and 6 will be described with reference to this flowchart.
First, the operation time of the air supply fan 5 and the exhaust fan 6 is set, for example, around 1 am. When the time set in this way is reached, the operation of the supply and exhaust fans 5 and 6 is started (step S-1).

Next, the air supply side temperature sensor 10 and the air supply side humidity sensor 11 detect the air supply side temperature and the air supply side relative humidity of the outside air. At this time, the dew point temperature is calculated and stored in the fan operation control device 8a. The Further, the exhaust side temperature sensor 12 detects the exhaust side temperature (or the temperature in the building 1) (step S-2).
Further, it is determined whether the supply-side relative humidity is equal to or higher than a set value (for example, 95% or higher) (step S-3).
If the supply-side relative humidity is equal to or higher than the set value, the fan operation is stopped (step S-4). If the supply-side relative humidity is equal to or lower than the set value, the presence / absence of a cooling object in the building 1 is determined (step S-5).

  If there is no cooling object in the building 1, the fan operation is continued (step S-6). In general, the outside temperature continues to drop at night, but at dawn, the outside temperature begins to rise due to solar radiation. Since the temperature in the building 1 shows a tendency similar to the temperature of the outside air, it is checked whether the exhaust temperature has started to rise (step S-7). If the exhaust temperature continues to fall, the fan operation is continued (return to step S-6), but when the exhaust temperature starts to rise, the fan operation is stopped (step S-8).

The presence or absence of a cooling object in the building 1 is determined (step S-5), and if there is a cooling object, it is determined whether or not the cooling object may condense (step S-9).
If condensation on the cooling object is not desirable, the temperature of the cooling object is compared with the dew point temperature calculated in step S-2 (step S-10).

If the temperature of the cooling object is lower than the dew point temperature, the fan operation is stopped (step S-11).
When the cooling object temperature is higher than the dew point temperature, no dew condensation occurs, so the operation is continued (step S-12), and it is checked whether the exhaust temperature starts to rise (step S-13). If the exhaust temperature continues to decrease, the fan operation is continued (return to step S-12), but when the exhaust temperature starts to increase, the fan operation is stopped (step S-14).

  It is determined whether or not the cooling object in the building 1 may be condensed (Step S-9). If the cooling object may be condensed, the fan operation is continued (Step S-15), and the exhaust temperature is increased. It is checked whether or not has started to rise (step S-16). If the exhaust temperature continues to fall, the fan operation is continued (return to step S-15), but if the exhaust temperature starts to rise, the fan operation is stopped (step S-17).

  In the flowchart of FIG. 6, two temperature sensors and one relative humidity sensor are used to aim for optimum operation under various conditions. However, if there is no particular problem with humidity and condensation in the building 1, The supply-side humidity sensor 11 that detects the supply-side relative humidity may be omitted. Further, since the change in the outside air temperature (supply air temperature) and the change in the building temperature (exhaust temperature) are substantially correlated, the fan operation is stopped by detecting that the temperature starts to rise only by the supply side temperature sensor 10. In this case, the exhaust temperature sensor 12 on the exhaust fan 6 side can be omitted, resulting in an inexpensive system configuration.

FIG. 7 is a diagram showing the correlation between the supply air temperature (outside air temperature) and the exhaust gas temperature (building temperature), with the horizontal axis representing time and the vertical axis representing temperature. As shown in the figure, when the fan is operated from about 1 am in the middle of the night, the supply air temperature (outside air temperature) and the exhaust air temperature (building temperature) decrease with time. For example, at 5 am just before sunrise. From around, the supply air temperature (outside air temperature) and exhaust temperature (building temperature) rise. Therefore, there is a correlation between the supply air temperature (outside air temperature) and the exhaust air temperature (building temperature). From this diagram, if the fan operation is stopped at around 5 am, the supply air temperature and the exhaust air temperature start to rise. I know it ’s good.
Although the present invention is a system that ventilates cold air at night, in the intermediate period (spring, autumn, etc.), the outside air may be low during the day. In this case, the air temperature in the building is lowered only by daytime ventilation. Can be used.

[Embodiment 3]
8 is a front view for explaining a night ventilation system according to Embodiment 3 of the present invention, FIG. 9 is a side view of FIG. 8, and FIG. 10 is a perspective view of the blowout casing shown in FIG. In addition, the same code | symbol is attached | subjected to the same part as Embodiment 2 (FIG. 3, FIG. 4), and description is abbreviate | omitted.
In the first and second embodiments, the blowing direction of the air supply fan 5 is substantially horizontal (b). However, in this embodiment, the blowing casing 13 is attached to the blowing port of the air supply fan 5 so that the blowing direction is almost the same. It is a downward direction.

The blowout casing 13 has its mounting portion 13a attached to the blowout opening of the air supply fan 5 with screws or the like, and is composed of a roof portion 13b inclined on the floor and both side portions 13c and 13d, and blows downward. A mouth 13e is provided.
Thus, even when the temperature difference between the outside air and the building is small, that is, when the air density difference is small, or when the installation position of the air supply fan 5 is considerably higher than the floor 4, the outside air cools downward. It blows out and reaches the floor 4.

  According to this Embodiment, since the blowing casing 13 was attached to the blower outlet of the air supply fan 5, the lower part in the building 1, ie, the lower air, the floor | bed 4, and the equipment 7 can be cooled efficiently.

[Embodiment 4]
FIG. 11 is a perspective view of a blowout casing of a night ventilation system according to Embodiment 4 of the present invention, and FIG. 12 is an operation explanatory view of FIG. In the present embodiment, the blow-out direction of the blow-out casing 13 shown in the third embodiment can be changed in the vertical direction and is also extended on both sides.

  As shown in the figure, the variable blowout casing 14 has a mounting portion 14a attached to the blowout port of the air supply fan 5, and includes a roof portion 14c and both side portions 14d and 14e to form a frame portion 14b. ing. A blow-out portion 15 is provided in the frame portion 14b, and slide shafts 15b and 15c provided in the rotating portion 15a extend along substantially arc-shaped guide holes 14f and 14e provided in both side portions 14d and 14e of the frame portion 14b. And slide back and forth. Further, the blowout portion 15 is provided with a central louver 15d constituting a guide plate, and side louvers 15e, 15f that are open on both sides toward the downstream side.

  Thus, when the blow-out portion 15 is slid in the front-rear a direction, the blow-out direction of the outside air moves between the horizontal direction and the downward direction, and the air blown out from the air supply fan moves the blow-out direction up and down. At the same time, as shown in FIG. 12, the outside air blows out from the side louvers 15e and 15f in both directions.

  As described above, the variable outlet casing 14 is provided at the outlet of the air supply fan 5 so that the night cold airflow flows on the floor surface 4 and both sides of the building 1. It can be adjusted so that the airflow reaches the floor 4 depending on the installation height of the air fan 5, and it is also possible to flow the night cold air uniformly in both directions in the building 1 to improve the cooling effect by performing efficient cooling. Can be made.

  This is used in a building such as a factory equipped with an air supply fan and an exhaust fan that takes in outside air with a cooling device, and in a region where the temperature drop of the outside air is large.

It is a front view for demonstrating the nighttime ventilation system which concerns on Embodiment 1 of this invention. It is a side view of FIG. It is a front view for demonstrating the nighttime ventilation system which concerns on Embodiment 2 of this invention. FIG. 4 is a side view of FIG. 3. It is an operation control block diagram of the fan of the whole system. It is a flowchart of operation control of an air supply and exhaust fan. It is a diagram which shows the correlation of outside temperature (supply air temperature) and building internal temperature (exhaust temperature). It is a front view for demonstrating the nighttime ventilation system which concerns on Embodiment 3 of this invention. It is a side view of FIG. It is a perspective view of the blowing casing shown in FIG. It is a perspective view of the blowing casing used for the nighttime ventilation system which concerns on Embodiment 4 of this invention. It is effect | action explanatory drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Building, 3a 1st side wall, 3b 2nd side wall, 5 Supply fan, 6 Exhaust fan, 8, 8a Fan operation control apparatus, 10 Supply side temperature sensor, 11 Supply side humidity sensor, 12 Exhaust Side temperature sensor, 13 blowing casing, 14 variable blowing casing, 15d, 15e, 15f louver, 15 blowing section.

Claims (7)

  The air supply fan provided on the first side wall of the building, the exhaust fan provided on the second side wall facing the first side wall, and the air supply / exhaust operation of each fan at night are started and almost at dawn. A night ventilation system comprising: a fan operation control device for stopping the supply / exhaust operation of each fan.   An air supply fan provided on the first side wall of the building, an air supply side temperature sensor provided in the vicinity of the suction port of the air supply fan to detect the outside air temperature, and a second facing the first side wall The exhaust fan provided on the side wall and the supply / exhaust operation of each fan are started at night, and the supply / exhaust operation of the fan is stopped when the outside air temperature detected by the temperature sensor changes from the lowered state to the raised state. A night ventilation system comprising a fan operation control device.   An air supply fan provided on the first side wall of the building, an air supply side temperature sensor provided in the vicinity of the intake port of the air supply fan to detect the outside air temperature, and provided in the vicinity of the intake port of the air supply fan An air supply side humidity sensor for detecting the relative humidity of the outside air, an exhaust fan provided on the second side wall facing the first side wall, and an air supply / exhaust operation of each fan at night When the outside air temperature detected by the temperature sensor changes from a lowered state to an elevated state, or when the outside air relative humidity detected by the air supply side humidity sensor exceeds a set value, the air supply / exhaust operation of each fan is performed. A night ventilation system comprising a fan operation control device for stopping.   An air supply fan provided on the first side wall of the building, an air supply side temperature sensor provided in the vicinity of the suction port of the air supply fan to detect the outside air temperature, and a second facing the first side wall An exhaust fan provided on the side wall, an exhaust side temperature sensor provided in the vicinity of the inlet of the exhaust fan or in the building, and supply / exhaust operation of each fan at night is started and detected by the supply side temperature sensor Fan operation that stops the supply / exhaust operation of each fan when the outside air temperature is changed from a lowered state to an elevated state or when the outside air temperature detected by the exhaust-side temperature sensor is changed from a lowered state to an elevated state A night ventilation system comprising a control device.   An air supply fan provided on the first side wall of the building, an air supply side temperature sensor provided in the vicinity of the intake port of the air supply fan to detect the outside air temperature, and provided in the vicinity of the intake port of the air supply fan An air supply side humidity sensor for detecting the relative humidity of the outside air, an exhaust fan provided on the second side wall opposite to the first side wall, and an exhaust provided near the suction port of the exhaust fan or in the building When the outside air temperature detected by the air supply side temperature sensor and the air supply side temperature sensor is changed from the descending state to the rising state after starting the air supply / exhaust operation of each fan at night or detected by the exhaust side temperature sensor When the detected temperature is changed from the lowered state to the raised state, or when the outside relative humidity detected by the air supply side humidity sensor exceeds the set value, the supply / exhaust operation of each fan is stopped. Nocturnal ventilation system, characterized in that a fan operation controller.   The night ventilation system according to any one of claims 1, 2, 3, 4, and 5, wherein a blow-out casing that forms a downdraft is provided at a blow-out port of the supply fan. The variable blowing casing having a louver that widens the blowing flow in both directions and having a blowing portion that moves the blowing flow in the vertical direction is provided at the blowing port of the air supply fan. The night ventilation system according to any one of 2, 3, 4, and 5.

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