JPH0428934A - Under-floor air-conditioning system - Google Patents

Abstract

PURPOSE:To disperse warm air which stays stagnant, reduce a temperature differential between the upper and lower parts of a space having occupants, and have the space comfortably air-conditioned by a system wherein a fan nozzle unit is provided and the cool air ejected by a fan unit under the floor into the room undergoes forced convection therein. CONSTITUTION:Cool air supplied from an air-conditioning unit 1 and through an air duct 3 and into a double-floor space 5 is sent into a room 7 by using a fan unit 6 located at a floor panel 4; and then drawn by a fan nozzle unit 14 installed near an outlet for the heat discharged from OA machinery, the supplied air is blown into the air in the room at an increased velocity and mixed with warm air resulting from heating by the OA machinery 12, the occupants, etc., and staying stagnant, so that temperature strata are cleared from the room. The cool air ejected at an increased velocity from the fan nozzle unit 14 circulates in the room 7 and is sucked into a double ceiling 10 through a return intake 9 in the ceiling 8, flows through a return air duct 11, and returns to the air-conditioning unit 1; after being cooled by the heat exchanger, the cool air is again sent through the air duct 3 and into the double- floor space 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an underfloor air conditioning system used for air conditioning in office buildings and the like.

Conventional technology In recent years, in intelligent buildings where OA has progressed, the mainstream is a raised floor system that creates a space under the floor and allows wiring, etc. to be routed freely. Underfloor air conditioning, which airs air inside the room by blowing air into the room through outlets formed on the surface, is becoming mainstream.

Part 6 about the configuration of conventional underfloor air conditioning systems
This will be explained with reference to the figures. As shown in the figure, the cold air from the first air conditioning unit 1 and the second air conditioning unit 2 is blown into a double floor 5 formed at the bottom of the floor panel 4 through a continuous air duct 3. The air is blown into the living room 7 from the fan unit 6 arranged on the floor panel 4. The blown out cold air is taken into the second air conditioning unit 2 again from near the floor, cooled by a heat exchanger (not shown), and then sent from the second air conditioning unit 2 to the inside of the double floor 5 and from above. What is blown out into living room 7,
From the suction port 9 placed in the ceiling 8, the double ceiling 10
The air is sucked into the air, returns to the first air conditioning unit 1 through the return air duct 11, is cooled by a heat exchanger (not shown), and is then blown into the double floor 5 through the air duct 3. .

Problems to be Solved by the Invention However, with such conventional underfloor air conditioning systems, in living rooms where a large number of OA equipment is used,
Warm air pools and temperature stratification occur in living rooms due to exhaust heat from OA equipment and heat generated by people. The cold air blown into the living room 7 from the fan unit 6 disposed on the floor panel 4 is prevented from rising and cannot convect by the warm air pool, and is separated into a layer of cold air and a layer of warm air. Within the living area (approximately 15 cm to 170 cm above the floor)
The difference in temperature between the top and bottom (in the range of centimeters) will increase.

In order to reduce this vertical temperature difference, it is necessary to increase the blowing speed of cold air to a speed that makes people feel uncomfortable in living areas, making it impossible to obtain a comfortable air-conditioned space.

In addition, the cold air that is taken into the second air conditioning unit 2 from near the floor, cooled by a heat exchanger (not shown), and then blown out from the top of the second air conditioning unit 2 is similarly affected by the warm air pool. The problem was that it ran along the wall, preventing convection, making it difficult to create a comfortable air-conditioned space in the living area.

The present invention is intended to solve the above-mentioned problems.The present invention is intended to solve the above-mentioned problems, and it is possible to minimize the difference in temperature between the upper and lower areas in the living area during cooling on floors where a large number of OA equipment, etc. are used, and to easily create a more comfortable air-conditioned space. The purpose is to provide floor air conditioning systems.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first means that includes a fan unit for blowing cold air from under the floor into the living room;
This fan unit blows cold air into the living room,
It is equipped with a fan nozzle unit to force convection within the living space.

In the second means, the fan nozzle unit is provided with a detection means for detecting the local comfort level provided in the living room, and a control means for varying the wind speed based on information from the detection means.

Further, the third means is such that the control means is a control means that can vary the wind speed to a blowing pattern with 1/f fluctuation.

Further, in a fourth means, the fan nozzle unit is made of artificial wood having a cold air outlet.

Effect: With the configuration of the fan nozzle unit of the first means of the present invention, cold air is blown into the double floor from the air conditioning unit and blown into the living room from the fan nozzle unit under the floor.
By destroying the warm air pools formed by the heat generated by office equipment and people, and creating forced convection, the temperature difference between the top and bottom of the living area is reduced, creating a comfortable air-conditioned space.

Further, with the configuration of the fan nozzle unit of the second means, the control means controls to vary the wind speed of the fan nozzle unit based on the information of the detection means that detects the local comfort level in the living room, and Even if significant load fluctuations occur,
This is something that works to help you cope.

Further, the configuration of the control means of the third means allows the wind speed to be reduced by 1/
It is possible to control the air blowing pattern to fluctuate f, and it works to realize air conditioning that gives a more natural feeling to people.

Furthermore, with the configuration of the fan nozzle unit of the fourth means, by blowing out cold air from the outlet provided in the trunk of the artificial tree, it is possible to blow out cold air from a position higher than the floor surface in the living room. It works to create a comfortable air-conditioned space with less temperature difference between the top and bottom, making it easier for cold air to convect.

EXAMPLE Hereinafter, a first example of the present invention will be described with reference to FIG. Note that parts that are the same as those in the conventional example are given the same numbers and explanations will be omitted.

As shown in the figure, in the living room 7, a fan unit 6 is provided near a desk 13 etc. on which an OA device 12 is installed, and a fan unit 14 is arranged near an OA device exhaust heat release port.

The operation of the underfloor air conditioning system configured as described above will be described below.

In the above configuration, the cold air supplied into the double floor 5 from the first air conditioning unit 1 via the ventilation duct 3 and the cold air supplied into the double floor 5 from the second air conditioning unit 2 are supplied to the floor panel 4. The fan unit 6 placed in the living room 7
Air is supplied inside. The cold air supplied into the living room 7 is attracted by the fan nozzle unit 14 installed near the OA equipment waste heat outlet of the desk 13 where the OA equipment 12 is placed, further increases the wind speed in the living room, and blows it out into the living room. OA equipment 12
It also mixes with warm air formed by heat generated by people, etc., and acts to eliminate temperature stratification. The cool air blown out at a higher wind speed by the fan nozzle unit 14 circulates in the living room 7, and then is sucked into the double ceiling 10 through the suction port 9 in the ceiling 8, and is then drawn into the return air duct 11.
After returning to the first air conditioning unit 1 and being cooled by a heat exchanger (not shown), the air is blown into the double bed 5 from the air duct 3 again. In addition, the cold air near the floor is taken into the second air conditioning unit 2, cooled by a heat exchanger (not shown), and returned to the double floor 5.
This is something that is blown out into the room and into the living room 7.

Next, regarding the second embodiment of the present invention, FIGS.
This will be explained with reference to the figures. Note that the same parts as those in the first embodiment are given the same numbers and their explanations will be omitted.

A detection means 16, for example, a comfort sensor capable of measuring human sensible temperature, airflow, radiant temperature, etc., is installed near the partition 15 of the desk 13 used by the worker in the living area,
The wind speed of the fan nozzle unit 14 is detected by the detecting means 16.
It has a control means 17 that controls based on the information of.

The operation of the underfloor air conditioning system configured as described above will be described below.

In the above configuration, the information of each detection means 16 is sent to the control means 17 of each fan nozzle unit 14 through each signal line 18 . The control means 17 controls the fan to increase the wind speed of the fan nozzle unit 14 when the sensible temperature is high and the airflow is slow, that is, when it feels hot, and when the sensible temperature is low and the airflow is fast, that is, when it feels cold. controls the fan to reduce the wind speed of the fan nozzle unit 14.

Next, a third embodiment will be described with reference to FIG. 4.

The graph in Figure 4 shows the change in wind speed on the vertical axis and the frequency power spectrum on the horizontal axis, and is an example of a 1/f fluctuation air blow pattern where the change in wind speed is a power spectrum inversely proportional to frequency. This shows that. People can feel comfortable when they come into contact with the seaside breeze, the highland breeze, music, and paintings. This is because the power spectrum of those frequencies is inversely proportional to the change in power with an inclination of 45 degrees, that is, it is a 1/f fluctuation, and this is thought to give a natural feeling to people. There is.

In a configuration similar to that of the second embodiment, the control means 17 of the fan nozzle unit 14 controls the change in the wind speed of the fan using a power spectrum in which the change in wind speed is inversely proportional to the frequency at an inclination of 45 degrees, as shown in FIG. The control is performed so that the air blowing pattern has a 1/f fluctuation as follows.

Next, a fourth embodiment will be described with reference to FIG. Note that parts that are the same as those in the conventional example are given the same numbers and explanations will be omitted.

As shown in the figure, the fan unit 6 disposed on the floor panel 4 is provided with a hollow water generator 19 with a height of about 1.8 m, and two Heavy bed 4
It has an air outlet 20 that can blow out the cold air inside in any direction.

With the above configuration, the cold air in the double bed 4 is blown out from the outlet 20 of the fresh water generator 19, and can be blown out from a position higher than the floor surface.

Although the fan nozzle unit 14 of the present invention is arranged near the OA equipment heat exhaust port, it goes without saying that it may be arranged in any part of the desk for office work or meetings.

As described above, according to the first embodiment of the present invention, since the fan nozzle unit 14 is provided near the OA equipment waste heat release port, the OA type equipment waste heat can be attracted and recovered from the suction port 9. At the same time, the fan nozzle unit 14 further increases the wind speed of the cold air on the floor in the living room 7 and blows it out into the living room 7, so that the cold air blown out from the fan unit 6 on the floor creates a warm air pool in the living area. It is possible to reduce the temperature difference between the top and bottom of the living area and create a comfortable air-conditioned space.

Further, according to the second embodiment of the present invention, the wind speed of the fan nozzle unit 14 can be varied in accordance with local load increases and decreases, human sensible temperature, etc., so that the overall temperature distribution within the living area can be changed. It is possible to achieve a more comfortable air-conditioned space without temperature stratification.

Further, according to the third embodiment of the present invention, by controlling the fan nozzle unit 14 so that the change in the wind speed of the fan nozzle unit 14 becomes a power spectrum that is inversely proportional to the frequency with an inclination of 45 degrees, Changes in wind speed in residential areas give people a feeling closer to nature, and
Due to irregular wind speed changes, OA equipment 12
Also, warm air pools and temperature stratification due to heat generated by people are less likely to be formed, and a more comfortable air-conditioned space can be realized.

Further, according to the fourth embodiment of the present invention, the heavy cold air in the double floor 4 can be blown out into the living area from a relatively high position, so that the difference in temperature between the upper and lower sides in the living area is effectively reduced. At the same time, it is possible to more efficiently obtain a comfortable air-conditioned space.

Effects of the Invention As is clear from the above embodiments, since the fan nozzle unit is provided near the exhaust heat release port of the OA type equipment, the O
It is possible to provide an underfloor air conditioning system that reduces the difference in temperature between the top and bottom in the living area during cooling on a floor where a large number of Class A equipment is used, and provides a more comfortable air-conditioned space.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an underfloor air conditioning system according to a first embodiment of the present invention, Fig. 2 is a block diagram of an underfloor air conditioning system according to a second embodiment of the present invention, and Fig. 3 is a block diagram of an underfloor air conditioning system according to a second embodiment of the present invention. An enlarged detailed view of the air conditioning system, Fig. 4 is a diagram showing the 1/f fluctuation pattern in the third embodiment, Fig. 5 is a configuration diagram of the underfloor air conditioning system of the fourth embodiment, and Fig. 6 is the conventional one. FIG. 2 is a configuration diagram of an underfloor air conditioning system. 5...Double floor, 6...Fan unit, 7...Living room, 14...Fan nozzle unit, 16...Detection means , 17...
・Control means, 19... Water production, 20...
Air outlet. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (4)

[Claims] (1) An underfloor air conditioning system equipped with a fan unit that blows cold air from under the floor into the living room, and a fan nozzle unit that forces the cold air blown into the living room from the fan unit into convection within the living space. (2) The underfloor air conditioner according to claim 1, wherein the fan nozzle unit is provided with a detection means for detecting the local comfort level provided in the living room, and a control means for varying the wind speed based on the information from the detection means. system. (3) The underfloor air conditioning system according to claim 1 or 2, wherein the control means is capable of varying the wind speed to a blowing pattern of 1/f fluctuation in which a change in wind speed is a power spectrum inversely proportional to frequency. (4) The underfloor air conditioning system according to claim 1 or 2, wherein the fan unit is made of artificial wood having a cold air outlet.