JP3123271B2 - Underfloor air conditioning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underfloor air-conditioning method, and more particularly to an air-conditioning method for changing the amount of air blown into a room at an arbitrary cycle.

[0002]

2. Description of the Related Art In general office buildings, department stores, supermarkets and the like, the interior of a room is almost air-conditioned, and recently, a part of a manufacturing plant has been air-conditioned. In some cases, the air conditioning in this manufacturing plant focuses on improving the quality of products rather than the comfort of workers, but in general office buildings, the focus is on the comfort of workers (occupants) and the functionality of the room. are doing.

[0003] Comfort is often controlled by temperature, humidity, air velocity and the like, and the optimal environment when these are combined has been clarified by many years of experience and research and is already well known. In addition to the above factors, there are other factors that affect comfort, such as carbon dioxide concentration, illuminance, and noise, which are often subject to legal regulations under the Building Management Law, etc. Have been.

[0004] Regarding the thermal sensation of humans, the room temperature that most affects the comfort of air conditioning has been controlled to a constant value, that is, how to control the temperature to an arbitrary set temperature without variation has been a problem. It has been controlled using control technology.

[0005] However, in recent years, with the diversification of values in the general world, there has been an increasing trend to further improve the comfort of air conditioning, and one of them is to create a refreshing atmosphere such as forests in general office buildings. In order to achieve this, phytoncides that emanate from forest trees are supplied to air conditioners. As for the airflow velocity, natural winds such as "grassland breezes" and "seaside breezes" are blowing more than a certain velocity (so-called "1 / f fluctuation").
It has been attempted to.

On the other hand, with regard to the functionality of a room, as seen in recent intelligent buildings, OA equipment has been installed on the floor and has become highly functional.
A so-called free access floor, which forms a space for wiring under the floor, is used as a flexible measure for the arrangement of the A devices, particularly for wiring. Furthermore, underfloor air-conditioning has been implemented in which the air-conditioning system also utilizes the under-floor space of the free access floor, in which warm or cool air is ventilated, discharged from outlets formed in the floor surface, and air-conditioned. I have.

This air conditioning system is shown in FIGS. That is, as shown in FIG. 5, the indoor space is divided into a living area 1 and a non-living area 2, and in the living area 1, an OA device 3, an OA device power supply 4, and a copying machine 5 are installed. Especially O
A equipment power supply 4 and copy machine 5 are heat sources, and
The lighting 6 includes a large factor in increasing the indoor heat load. The conditioned air mixes outside air and ventilation with an air conditioner 7, is cooled and dehumidified by a cooling coil 8, is heated and controlled to an arbitrary temperature by a heating coil 9, and is then humidity controlled by a humidifier 10.
Air-conditioned air controlled to any temperature and humidity
The air is sent to the underfloor chamber 12 by the blower 11, and is supplied into the room from the outlet 13 provided on the floor.

The supplied conditioned air rises from the living area 1 to the non-living area 2, and at this time, the OA equipment power supply 4
And the heat 14 generated from the copying machine 5 is involved. Next, this air is supplied to the suction port 15 installed on the ceiling.
The air is further drawn into the ceiling chamber 16 and partly discharged outside the room by the return air duct 17, and the rest is returned to the air conditioner 7. At this time, the temperature distribution in the height direction of the indoor space is as shown in FIG.
In the non-living area 2 of 1800 mm or more, the temperature rises due to the heat generated by the OA equipment power supply 4 and the copying machine 5 and reaches 25 ° C. or higher. Has become.

[0009]

However, in recent office buildings, the installation density of OA equipment, etc., which is a heat source, has increased.
With the advancement of advanced functions, the indoor sensible heat in air conditioning has also increased remarkably, and the number of places where cooling is performed throughout the year is increasing. Furthermore, since the total circulation amount of the conditioned air is also increasing, the power of the blower is also increasing, and the energy consumption is dramatically increasing. This is a serious problem related to the recent global environmental problems.

SUMMARY OF THE INVENTION An object of the present invention is to provide an underfloor air-conditioning method capable of saving energy during cooling .

[0011]

Means for Solving the Problems of claims 1 invention, balloon conditioned air from the floor, the underfloor air conditioning method for drawing return air from the ceiling surface, the room air volume of the cooling
It is characterized in that it is changed periodically in a cycle of about one hour .

According to a second aspect of the present invention , there is provided the method of
Indoor air flow is the same in the order of small air volume, maximum air volume, and intermediate air volume
While repeating the pattern,
It is characterized by having been lengthened .

[0013]

As described above, according to the present invention, while the air blowing amount is conventionally constant, the blowing temperature can be increased and the blowing amount can be reduced by periodically changing the air blowing amount, so that energy can be saved. A simple underfloor air conditioning method can be realized, and a comfortable living environment can be created.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the embodiments shown in the drawings. FIG. 1 is a schematic diagram of a room when the air flow rate is minimized in the operation status of the underfloor air conditioning method of the present invention, and the same parts as those in FIG. 5 are denoted by the same reference numerals. The circulation path of the conditioned air is the same as in FIGS. 5 and 6, but the conditioned air blown out from the outlet 13 has a small flow velocity, and moves toward the ceiling as a slightly ascending airflow. At this time, the heat 14 of the OA equipment power supply 4 and
Rises without being caught in this air current and stays in the non-living area 2, and a part thereof flows from the suction port 15 to the ceiling chamber 1.
6 is led to the return air duct 17.

On the other hand, FIG. 2 shows a schematic configuration diagram of the room when the amount of air blows is the maximum, and the same parts as those in FIG. 5 are denoted by the same reference numerals. The conditioned air blown out from the outlet 13 has a large flow velocity, and moves toward the ceiling at a stretch at a flow velocity at which a sense of air flow is considerably felt. At this time, the conditioned air is the heat that has stayed in the non-living area 2 centering on the vicinity of the ceiling when the air volume is small as described in FIG. Is drawn from the suction port 15 to the ceiling chamber 16 at a stretch.

FIG. 3 shows an example of measuring the temperature distribution in the height direction of the indoor space at this time. The line A shows the conventional case,
Lines B and C show the case where the air volume is small and the air volume is large, respectively. The blowing temperature is set to about 1 degree higher than before, and when the amount of air blow is small, the temperature distribution pattern is the same as before, but the temperature rise increases as it approaches the ceiling as much as the heat retention increases . On the other hand, when the amount of air blow is large, the staying heat is wasted at once, and the rate of temperature rise in the height direction becomes small. Therefore, the above-described temperature distribution is alternately repeated by changing the air blowing amount.

FIG. 4 shows an example of the lapse of time of the blowing speed during such an operation. As is apparent from FIG.
The air volume is small until the air flow reaches about 0.1 minute.
At 1 m / s, the air flow rate is maximized in 25 to 30 minutes (the wind speed at this time is about 0.8 m / s), and 30 to 3
This state is maintained for 5/5 minutes. After this, 35-4
Reduce the air volume in 5/0 minutes, and reduce
The air flow is maintained at about 0.5 m / s for 5 minutes, the air flow is further reduced in 5 to 50/55 minutes, and the air flow is minimized for 55 to 85/30 minutes. 1 m / s). Thereafter, this pattern is repeated. The basis for setting the wind speed of the outlet 13 to 0.1 m / s is as follows.
This is because the airflow velocity of 0.1 m / s is the minimum perceived flow velocity at which the airflow is felt. Further, the value of 0.5 m / s is set to the standard value (= 0.
5 m / s or less). In addition, 0.8m /
The reason for setting s is that this flow velocity is the lowest value in a region where most people can sense the airflow.

As described above, the amount of air is periodically changed, and when the amount of air is small, heat is transferred to a non-living area in the manner of an air lift and stays there, so that the room temperature starts to feel unpleasant. This operation is continued until then, and the heat is exhausted at a stretch by maximizing the air volume. Next, the blowing wind speed is reduced to a blowing amount of about 0.5 m / s at which a sense of airflow is felt. By feeling this airflow feeling, even if the blowing temperature is increased by about 1 degree, the user can continue to feel more comfortable without feeling thermal discomfort.

As described above, according to the underfloor air-conditioning method, by periodically changing the amount of air blow, it is possible to more comfortably increase the blow-out temperature and reduce the amount of air blow. The method can be realized.

In the above-described embodiment, an example has been described in which the outlet temperature is set to be one degree higher than the conventional temperature set value in the indoor air conditioning method of floor discharge and ceiling suction, but this temperature set value may be arbitrarily set. You may choose.

As described above, according to the present invention, in an underfloor air-conditioning method in which conditioned air is blown out from the floor surface and return air is sucked in from the ceiling surface, the amount of indoor air blown during cooling is reduced.
Since the air flow rate can be periodically changed in a cycle of about one hour, the amount of air to be blown can be reduced as compared with the related art, so that an underfloor air conditioning method that can save energy can be realized .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a room when an air flow rate is minimized in an operation state of an underfloor air conditioning method of the present invention.

FIG. 2 is a schematic configuration diagram of a room when the amount of air blow is maximized in the operation status of the underfloor air-conditioning method of the present invention.

FIG. 3 is a diagram showing an example of setting the temperature in the height direction of the indoor space in the underfloor air-conditioning method according to the present invention.

FIG. 4 is a diagram showing a measurement example of a blown wind speed during operation of an underfloor air conditioning method according to the present invention.

FIG. 5 is a schematic diagram of the interior of a conventional underfloor air conditioning method.

FIG. 6 is a diagram showing an example of temperature measurement in the height direction of an indoor space in a conventional underfloor air conditioning method.

[Explanation of symbols]

 13 Outlet 15 Inlet 16 Ceiling chamber 17 Return air duct

Claims (2)

(57) [Claims] 1. A blowing conditioned air from the floor, the underfloor air conditioning method for drawing return air from the ceiling surface, cooling
An underfloor air-conditioning method characterized by periodically changing the amount of indoor air blown at a cycle of about one hour . 2. The method according to claim 2, wherein said periodically changing indoor air flow rate is small.
Repeat the same pattern in the order of air volume, maximum air volume, intermediate air volume
The underfloor air-conditioning method according to claim 1 , wherein the time period of the small air volume is set to be the longest .