JP4756791B2 - Spot air conditioning system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spot air conditioning system. More specifically, the present invention relates to a spot air conditioning system suitable for performing air conditioning in a spot manner from each air outlet by disposing and arranging air outlets of a plurality of air conditioners (air conditioners) in a wide air conditioning target zone.
[0002]
[Prior art]
When air conditioning such as cooling and heating is performed on a wide space that is difficult to seal, such as a subway yard or a factory work area, a large-scale air conditioner is required to harmonize the entire air, and efficiency is low. Therefore, conventionally, as shown in FIG. 7, for example, as shown in FIG. 7, the air outlets 102 of the so-called package type air conditioner 101 are distributed in a plurality of locations in the target area, and air conditioning is performed for each relatively narrow target zone Z1, Z2. The method of spot air conditioning (local air conditioning) is adopted. Thereby, only the necessary small area is air-conditioned, and an energy saving effect can be achieved. Reference numeral 103 denotes an air duct that connects the air conditioner 101 and the target zone, and reference numeral 104 denotes an air suction duct of the air conditioner 101.
[0003]
On the other hand, Japanese Patent Application Laid-Open No. 4-6339 discloses a heat pump type air conditioner provided with a sub-channel (return channel) 110 as shown in FIG. This is the main flow path 114 from the intake port 111 through the heat exchanger 112 to the blower port 113, the blower 115 provided downstream of the heat exchanger 112, the portion of the main flow path near the blower port 113 and the close to the intake port 111. And a sub-flow channel 110 connected to the part. Then, a damper 116 for switching the air flow to the main / sub-channel and a refrigerant pressure / air temperature detecting means 117 are provided, and the switching damper controls the opening degree of the sub-channel 110 as the air temperature rises. The device is adopted. This is intended to solve the problem that when the heat pump type air conditioner starts up, especially when the cold air comes out during heating and blows out with strong wind, it causes discomfort to the human body. It is said that the blowout from the path 114 is suppressed, the air is recirculated through the sub-flow path 110, thereby quickly increasing the refrigerant temperature, and the heating capacity can be maximized.
[0004]
[Problems to be solved by the invention]
Since the conventional spot air-conditioning method performs air conditioning in a spot manner in a necessary area, it has a certain energy saving effect. However, since each air conditioner is operated individually, there is a limit in the adjustment range of the air volume and the adjustment range of the temperature due to the limitation of the operation condition of the air conditioner. For example, in general, it is necessary to operate with an air volume of 65 to 100% of the rated air volume. If the air volume is excessively reduced, the fan surgings and the capacity is rapidly reduced. In the case of cooling, frost may be generated on the cooling coil surface. Therefore, it is necessary to make the air volume more than the required air volume, and energy is wasted. Furthermore, since air conditioners are independent for each zone, for example, when two units are operating, even when the load is 50% as a whole, if the required area for spot air supply spans two zones, one air conditioner must be installed. If stopped, the air-conditioning environment of the zone will be lowered, so it is necessary to operate both units, and energy is wasted.
[0005]
In addition, there is a limit to the cooling capacity and heating capacity of one air conditioner, and if the temperature of the target zone is high in summer, there may be cases where sufficient low-temperature air blowing cannot be performed. In addition, sufficient high-temperature air cannot be blown even during heating. For example, when the intake air has a temperature of 35 ° C. (summer), a relative humidity of 55%, and a wet bulb temperature of 27 ° C., the cooling lower limit is about 23 ° C. when the air volume is 100%. When the suction temperature is 5 ° C. (in winter, indoors), the heating upper limit is about 24 ° C. when the air volume is 100%. For this reason, it is not possible to sufficiently blow out cold air and hot air to people around the air outlet.
[0006]
Technical Problem It is a technical object of the present invention to comprehensively operate a plurality of spot air-conditioning air conditioners that have conventionally been operated independently as a system, thereby expanding the air flow adjustment range while satisfying the operating conditions of each air conditioner. It is said. Furthermore, the present invention adopts the concept of the bypass duct of the heat pump air conditioner described above, and even when the intake air environment is insufficient, the lower limit of the blowing temperature can be lowered and the upper limit can be raised, thereby enabling spot air conditioning. The technical challenge is to provide a spot air conditioning system that can be made even more comfortable.
[0007]
[Means for Solving the Problems]
The spot air-conditioning system of the present invention includes a plurality of air conditioners each being a packaged air conditioner, a blower duct connected to each air conditioner, and a communication between the blower ducts and a plurality of air conditioning targets. A communication duct having a blowout opening to the zone, and a return duct that branches from the middle of the air duct and returns a part of the supply air to the air intake side of the air conditioner, and the tip of the air duct Are connected in the middle of the communication duct at connection points separated from each other, and an air volume damper for adjusting or blocking the air volume from each air duct is interposed between the connection points. A front end side extends from the connection point toward the air-conditioning target zone, and the blow-out opening is opened at the front end thereof. Between the point, each provided with a second air volume dampers, it is characterized in that comprises a further third air volume damper in the middle of each return duct.
[0008]
[Operation and effect of the invention]
In the air conditioning system of the present invention, the air ducts of a plurality of air conditioners are connected by a communication duct. Therefore, when the overall load is small, the air conditioning is performed on the entire target zone only by a part of the operation. It can be performed. In this case, the air volume can be greatly reduced according to the required air volume while satisfying the operating conditions of the operating air conditioner. Therefore, the adjustment range of the air volume is expanded.
[0009]
Further, since the air volume damper for adjusting or blocking the air volume from each air duct is interposed in the communication duct, only the necessary zone can be air-conditioned by blocking the air volume damper. Therefore, only the minimum necessary number of operations are required according to the load, and the energy-saving operation can be performed while maintaining the required air blowing amount .
Further, since the air conditioner is provided with a return duct for returning a part of the air to the intake side from the middle of the air duct, the intake temperature of the air conditioner by the warm air (or cold air) returned by the return duct is provided. Can be raised (or lowered). Therefore, the air conditioning effect can be increased even when the ambient suction temperature is low (or high).
[0010]
In a spot air conditioning system in which an air volume damper for adjusting or blocking the air volume is provided in at least one air outlet, when there is no person near the air outlet, or when there are few people, the air volume of the air outlet By cutting off the damper, the energy saving effect is improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the spot air conditioning system of the present invention will be described with reference to the drawings. FIG. 1 is a duct system diagram showing a basic embodiment of the air conditioning system of the present invention, FIG. 2 is a time chart showing an operation pattern of the air conditioning system, and FIG. 3 is a duct showing another embodiment of the air conditioning system of the present invention. FIG. 4 is a time chart showing an operation pattern of the air conditioning system, and FIGS. 5 and 6 are duct system diagrams showing still other embodiments of the air conditioning system of the present invention.
[0013]
The air conditioning system 10 of FIG. 1 has shown the basic form in the case of using two air conditioners (air conditioner), 1st air conditioner A1 and 2nd air conditioner A2. The return duct, the second air volume damper, and the third air volume damper are omitted. The air ducts 11 and 12 extend from the air conditioners A <b> 1 and A <b> 2, and their tips are connected to the middle of the communication duct 13. An air volume damper D1 is interposed between the connection points 11a and 12a between the air ducts 11 and 12 and the communication duct 13. Both ends of the communication duct 13 are open toward the first air-conditioning target zone (first zone) Z1 and the second air-conditioning target zone (second zone) Z2. Reference numerals 14 and 15 denote suction ducts of the air conditioners A1 and A2. As the communication duct 13, a duct having a somewhat wide cross-sectional area is generally used so as not to cause a back pressure difference as much as possible between the connection points 11 a and 12 a with the air blowing ducts 11 and 12.
[0014]
As each of the air conditioners A1 and A2, a package type air conditioner in which a compressor and a heat exchanger are integrated is usually used, and a blower fan for sending air to the blower ducts 11 and 12 is incorporated. The amount of air blown by the blower fan varies depending on the manufacturer and model, but can generally be adjusted in the range of 65 to 100% of the rated airflow. The compressor can only be switched ON / OFF. However, the rotational speed of the compressor may be adjusted by inverter control. For example, the air volume damper D1 is provided with a shielding plate that shields the duct so as to be rotatable by a shaft, and can take a state of shielding the duct and a state of blowing air. The duct is shut off and the air flow is switched by a motor connected to the shaft, and the motor can be remotely operated by a controller.
[0015]
The air conditioning system 10 configured as described above can be operated in the following various patterns by adjusting the air volume of the air flow damper D1 and the air blowing fans of the air conditioners A1 and A2 with the damper.
[0016]
[Independent operation mode]
When the air volume damper D1 is closed, each of the air conditioners A1 and A2 can be operated individually as in the case where the conventional air conditioners are independent. Therefore, for example, if air conditioning in the second zone Z2 is unnecessary, the second air conditioner A2 is stopped after closing the air volume damper D1, and only the first air conditioner A1 is operated to air condition the first zone Z1. Good. The same applies to the reverse case.
[0017]
[Single operation mode]
When the overall load is small, only the first air conditioner A1 is operated after opening the air volume damper D1. In that case, if the air volume of the first air conditioner A1 is reduced to 65% of the rated air volume, the air can be blown to both zones Z1 and Z2 with an air volume of 32.5% that is 1/2 of that. Then, by increasing the air volume of the first air conditioner A1 to 100%, the air volume of each zone Z1, Z2 can be increased to 50% (the imaginary line in the “single unit operation” column of FIG. 2). P). Thereby, an energy saving effect is achieved.
[0018]
[Both operation mode]
When the air volume required in each zone Z1, Z2 is 50% or more of the total air volume, both the first air conditioner A1 and the second air conditioner A2 are operated. In that case, if the air volume of both air conditioners A1 and A2 is reduced to 65%, the air can be blown with an air volume of 65% for each of the zones Z1 and Z2. In order to increase the air volume further, it is only necessary to increase the air volume of both air conditioners A1 and A2, thereby increasing the air volume to 100% in each zone ("Two-unit operation" in FIG. 2). (See the imaginary line P in the column).
[0019]
Next, a further developed air conditioning system 20 will be described with reference to FIG. The air conditioning system 20 shown in FIG. 3 is characterized in that return ducts (bypasses) 17 and 18 to the suction ducts 14 and 15 are provided from the middle of the air ducts 11 and 12 of the air conditioners A1 and A2. In this embodiment, the branch ducts 17a and 18a of the return ducts 17 and 18 in the air ducts 11 and 12 and the communication duct 13 of the air ducts 11 and 12 are connected to the air ducts 11 and 12 in order to further enhance the effects of the return ducts 17 and 18. A second air volume damper D2 is interposed between the connection points 11a and 12a, respectively, and a third air volume damper D3 is also interposed in the middle of the return ducts 17 and 18. The second air volume damper D2 only needs to be able to adjust the air volume, and may not have a function of blocking. However, a function of blocking may be provided, and in that case, it is preferable to block when the corresponding air conditioner is not operated.
[0020]
In the air conditioning system 20, if the second air volume damper D2 is fully opened and the third air volume damper D3 is closed, the air conditioning system 10 is the same as the air conditioning system 10 of FIG. For this reason, the same operational effects as described above are obtained. In addition, although the ratio of the return air volume by a return duct changes with conditions, such as suction temperature, it can be made into about 0 to 50% as a standard. In that case, for each air conditioner, the second air volume damper D2 is throttled to some extent and the third air volume damper D3 is opened to some extent, so that the cooled or heated air once again in the range of 0 to 50%, for example, is returned again through the ducts 17 and It can be returned to the suction side and mixed with the surrounding air. Thereby, the intake air temperature is higher or lower than the ambient air temperature, and the air blown from the blower ducts 11 and 12 to the communication duct 13 is further cooled or heated than in the case of the air conditioning system 10 of FIG. Air.
[0021]
For example, when the intake air (ambient air) has a temperature of 35 ° C. (summer), a relative humidity of 55%, and a wet bulb temperature of 27 ° C., the lower limit of cooling is about 23 ° C. when the air volume is 100%. However, in this embodiment, the cooling lower limit can be set to about 17 to 18 ° C. (suction, wet bulb temperature 23 ° C.) by partially returning the cooling or heating air. Similarly, when the room temperature is 5 ° C. (in winter, indoors), the upper limit of heating is about 24 ° C. when the air volume is 100%. In this embodiment, the upper limit of heating is about 43 ° C. (suction, dry). Sphere temperature of 24 ° C.). By returning the cooling or heated air in this way, the adjustment range of the temperature of the air blown out from the communication duct 13 can be greatly expanded compared to the case where there is no return duct.
[0022]
Further, by returning the air in the air ducts 11 and 12 to the air conditioners A1 and A2 by the return ducts 17 and 18, the amount of air sent from the air ducts 11 and 12 to the communication duct 13 is reduced, for example, in the range of 50 to 100%. This means that when the air volume of the blower fans of the air conditioners A1 and A2 is reduced to 65%, the air volume from the air ducts 11 and 12 to the communication duct 13 can be reduced to 32.5 to 65% ( (See the solid line in the column for single-unit operation in FIG. 4). Therefore, in the case of single-unit operation, one zone can be reduced to 50%, that is, 16.5 to 32.5% (see the imaginary line P in the single-unit operation column of FIG. 4). Therefore, in the air conditioning system 20 of FIG. 3, not only the temperature adjustment range but also the air volume adjustment range can be greatly expanded.
[0023]
In the above-described embodiment, two air conditioners are used, but in the air conditioning system of the present invention, three or more air conditioners can be used, which can further expand the adjustment range of the air volume and temperature. The air conditioning system 30 shown in FIG. 5 uses three or more air conditioners A1, A2, A3. The pipeline configuration from each air conditioner A1... To the communication duct 13 is the same as in FIG. The connection points 11a, 12a, 31a between the air ducts 11, 12, 31 and the communication duct 13 of each air conditioner communicate with the corresponding zones Z1, Z2, Z3, and adjacent connection points 11a, 12a, 31a. Between them, the communication duct 13 is interrupted, or a first air volume damper D1 for adjusting the air volume is interposed.
[0024]
In general, it is preferable to install the air conditioners A1, A2,... At one place because maintenance and wiring with the controller are simplified. However, it can also be distributed. In the case of dispersive arrangement, for example, the left end and the right end of the communication duct 13 may be connected via a blower damper, and the communication duct 13 may be provided in a loop shape.
[0025]
About the effect | action of said air conditioning system 30, it is substantially the same as the air conditioning system 20 of FIG. However, as the number of air conditioners increases, the lower limit of airflow can be further reduced. In other words, if only one vehicle is operated, each zone can be supplied with an airflow of one of the number. And if a load becomes large, what is necessary is just to increase the number of the air-conditioners to drive according to it. In addition, when the air blowing temperature required in one zone Z1 is low and the air blowing temperature is not so low in other zones, the first air volume damper D1 at the left end is closed or the throttle amount is increased. What is necessary is just to reduce the ventilation temperature using the return duct 17 of the air conditioner A1. As described above, the air conditioning system 30 can achieve both the energy saving effect and the improvement of the air conditioning effect.
[0026]
Also, a fourth air volume damper D4 is provided in the middle of the blowing duct 19 for sending air from the communication duct 13 to each zone Z1, Z2,..., Blocking the blowing air and adjusting the air volume, and reducing the air volume on the outlet side. You can also. Even in that case, the energy saving effect is exhibited. This point is the same in any of the air conditioning systems 10 and 20 described above.
[0027]
In the embodiment of FIGS. 1 and 3, the first damper D1 is simply a damper that switches between blocking and blowing, but an air volume damper that adjusts the blowing amount by adjusting the angle of the shielding plate can also be used. In that case, the air supply amount distributed to each zone can be changed by changing the throttle amount of the air volume damper D1. However, since the pressure between the connection points 11a and 12a of the air ducts and the communication ducts of the air conditioners A1 and A2 is different, it is actually difficult to control the air flow through the air ducts 11 and 12. Therefore, in order to control the air volume passing through the first damper D1, for example, as shown in FIG. 6, the air ducts 11 and 12 include air volume dampers (proportional dampers) 41 and 42, air volume sensors 43 and 44, and air volume sensors thereof. A damper opening adjustment controller 45 for adjusting the opening of the air volume dampers 41 and 42 based on the outputs of 43 and 44 is provided, and the air volume passing through the ducts 11 and 12 is set to the same or a predetermined ratio by the controller 45. It is desirable to take measures such as adjusting the aperture amount of the first damper D1 while maintaining it.
[0028]
In this way, by changing the throttle amount of the first damper D1, when providing a difference in the air volume to the first zone Z1 and the second zone Z2, the range of the air volume adjustment and the range of the temperature adjustment are further expanded. Can do.
[Brief description of the drawings]
FIG. 1 is a duct system diagram showing a basic embodiment of an air conditioning system of the present invention.
FIG. 2 is a time chart showing an operation pattern of the air conditioning system of FIG. 1;
FIG. 3 is a duct system diagram showing another embodiment of the air conditioning system of the present invention.
4 is a time chart showing an operation pattern of the air conditioning system of FIG. 3; FIG.
FIG. 5 is a duct system diagram showing still another embodiment of the air conditioning system of the present invention.
FIG. 6 is a duct system diagram showing still another embodiment of the air conditioning system of the present invention.
FIG. 7 is a duct system diagram showing an example of a conventional stand-alone air conditioner.
FIG. 8 is a system diagram showing another example of a conventional air device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Air conditioning system A1 1st air-conditioner A2 2nd air-conditioner 11, 12 Air duct 13 Communication duct 11a, 12a Connection point D1 (1st) Air volume damper Z1 1st zone Z2 2nd zone 14, 15 Suction duct 20 Air-conditioning system 17, 18 Return ducts 17a, 18a Branch point D2 Second air volume damper D3 Third air volume damper 30 Air conditioning system A3 Air conditioner 31 Air duct Z3 Zone 31a Connection point D4 Fourth air volume damper 19 Air duct 41, 42 Air volume damper 43, 44 Air volume sensor 45 Damper Controller for opening adjustment

Claims (1)

Multiple air conditioners, each of which is a packaged air conditioner,
An air duct connected to each air conditioner;
A communication duct that communicates with the air ducts and has outlets to a plurality of air conditioning target zones;
A return duct for branching from the middle of the air duct and returning a part of the supply air to the intake side of the air conditioner,
The front ends of the air ducts are connected in the middle of the communication duct at connection points separated from each other, and air volume dampers for adjusting or blocking the air volume from the air ducts are interposed between the connection points. ,
The front end side of the communication duct extends from the connection point toward the air conditioning target zone, and the blowout opening is opened at the front end thereof.
A second air volume damper is provided between the branch point of the return duct in the air duct and the connection point, respectively.
A spot air conditioning system with a third air volume damper in the middle of each return duct .

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