JPH04268130A - Air-conditioning device - Google Patents

Abstract

PURPOSE:To maintain a cooling and a heating capacity at a value equal to each other and to improve amenity through reduction of a temperature difference between a discharge air temperature and a temperature in an area as a capacity of a fan is prevented from an increase, in an air-conditioning device provided with a fan to discharge air, the temperature of which is regulated by a temperature regulating means, through a discharge port to an area to be air-conditioned. CONSTITUTION:An induction mixing means 14 to mix air in an area in feed air A1 from a fan 7 through induced suction of air A2 in an area of an area 2 to be air-conditioned through the flow of the feed air A1 from the fan 7 is located in a feed air passage 9 running from the fan 7 to a discharge port 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner equipped with a fan that blows air whose temperature has been adjusted by a temperature control means from an outlet into an air-conditioned area.

0002

2. Description of the Related Art Conventionally, as shown in FIG. A hot water coil 8H and a cold water coil 8 are provided, and a hot water coil 8H and a cold water coil 8 are installed in a blowing air path 9 from the fan 7 to the air outlet 6.
The air A1 (
That is, there is a device in which the temperature is adjusted by heating or cooling the air (air blown out from the outlet 6) (Conventional Example 1).

Further, as shown in FIG. 8, a temperature control means 8 is interposed in the suction air path from the main intake 4 to the fan 7, which takes in the air A1 in the air-conditioned area 2 by the suction action of the fan 7. In the suction air path, on the downstream side of the temperature control means 8, the air A within the air-conditioned area 2 is drawn by the suction action of the fan 7, similar to the main intake 4 described above.
A sub-intake port 13 is provided to take in the air A1, which has been heated or cooled by the temperature control means 8 and whose temperature has been adjusted.
On the other hand, there is a system in which air A3 mixed with air A2 taken in from the sub-intake port 13 is blown out from the air outlet 6 to the air-conditioned area 2 by the fan 7 (conventional example 2).
).

0004

[Problem to be solved by the invention] However, the above conventional example 1
In this device, air A1 whose temperature has been adjusted by being heated or cooled by the temperature control means 8 is directly blown out from the outlet 6 into the air conditioning target area 2, so that the amount of heating or cooling of the temperature control means 8 is increased to achieve large air conditioning and heating. In order to cope with the load (particularly the cooling/heating load at the time of startup of cooling/heating operation or when changing the setting of the adjustment target internal temperature), it is necessary to A fairly large temperature difference dT is generated, and as a result, there is a problem in that people living in the air-conditioned area 2 feel hot or cold or uncomfortable when exposed to the blown air A1.

Furthermore, in order to solve the above problem in the apparatus of Conventional Example 1, the amount of air blown by the fan 7 is increased to increase the amount of air blown out compared to the same amount of heating or cooling of the temperature control means 8. It is also possible to reduce the temperature difference dT between the area temperature Tr and the blown air temperature To, but in this case, a large capacity fan 7 is required, which increases fan power consumption and equipment cost. In addition, regarding the temperature control means 8 such as the hot water coil 8H and the cold water coil 8C, the temperature control means 8 is made larger to avoid the increase in pressure loss due to the increase in fan air flow. Additional measures such as securing a large cross-sectional area were required.

On the other hand, the device of Conventional Example 2 mixes the area air A2 taken in from the sub-intake port 13 with the air A1 whose temperature has been adjusted by the temperature control means 8, thereby adjusting the temperature between the outlet air temperature To and the area temperature Tr. This device is designed to reduce the temperature difference dT to deal with the above-mentioned problems of heat, cold, and discomfort caused by the temperature difference dT, but this device is also substantially the same as the device of Conventional Example 1 described above. Similar to the solution method, the solution is simply to increase the amount of air blown by the fan 7 relative to the equivalent heating or cooling amount of the temperature control means 8, and in this respect, the fan 7 also needs a large capacity. As a result, there is a problem in that the power consumption of the fan and the cost of the device increase.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to avoid increasing the capacity of the fan and to reduce the temperature of the blown air and the temperature within the area by adopting a rational air blowing configuration. The aim is to solve the above-mentioned problems of heat, cold, and discomfort caused by temperature differences.

[0008]

[Means for Solving the Problems] A first characteristic configuration of an air conditioner according to the present invention is a configuration in which a fan is provided for blowing out air whose temperature has been adjusted by a temperature control means from an outlet to an air-conditioned area. An induced mixing means is provided in the air flow path from the air outlet to the air outlet, and the air is drawn into the area to be air-conditioned by the flow of the air emitted from the fan, and is mixed with the air emitted from the fan. There is, and its actions and effects are as follows.

[0009]

[Operation] In other words, in the above-mentioned first characteristic configuration, the air in the air-conditioned area that is induced and sucked in by the induced mixing means is mixed with the air sent out from the fan to increase the amount of air blown out from the outlet. Compared to the case where the amount of blown air is not increased, the temperature difference between the blown air temperature and the temperature within the area is smaller for the same amount of heating or cooling of the temperature control means.

[0010] Furthermore, the above-mentioned induced mixing means attracts and sucks air within the area by the flow of the air sent from the fan in the air passage leading from the fan to the outlet, and mixes it with the air sent out from the fan. Even if the temperature difference between the blown air temperature and the area temperature is reduced by increasing the amount of blown air relative to the equivalent heating or cooling amount of the temperature control means, the amount of air blown by the fan itself (in other words, the fan capacity ) can increase the amount of air blown from the outlet without increasing the size, and even if it is necessary to change the fan specifications, the fan size is small enough to compensate for the increase in air delivery resistance due to the air induced suction by the induced mixing means. This can be accomplished by simply increasing the discharge pressure.

[0011]

As a result of the above operations, according to the first characteristic configuration of the present invention, it is possible to avoid increasing the capacity of the fan, which would lead to a large increase in fan power consumption and equipment cost, and it is advantageous in terms of energy saving and economy. At the same time, it effectively prevents people living in the air-conditioned area who are exposed to the blown air from feeling hot or cold or feeling uncomfortable due to the large temperature difference between the blown air temperature and the temperature inside the area. This can be suppressed and avoided, and air conditioning performance can be greatly improved in terms of comfort.

(Second and Third Features of the Present Invention) A second feature of the air conditioner according to the present invention is that a Venturi tube portion is provided in the air outlet path from the fan to the outlet, and the Venturi tube portion The induced mixing means is constructed by communicating the porous portion formed in the pipe wall of the portion with the area to be air-conditioned.

That is, according to the second characteristic configuration, as the fan-delivered air passes through the Venturi tube section, an induced suction action occurs to the inside of the tube via the porous section according to Bernoulli's law, and , Due to this induced suction effect, air is sucked into the area from the area to be air-conditioned, and
The air in the suction area is mixed with the air passed through the pipe and sent out by the fan in a reliable and efficient manner.

A third characteristic feature of the air conditioner according to the present invention is that the temperature control means is disposed upstream of the induced mixing means.

[0015] In other words, when the temperature control means is disposed between the induced mixing means and the outlet (that is, downstream of the induced mixing means), the temperature control means has a resistance to the flow of the fan-delivered air in the induced mixing means. Therefore, the function of attracting and inhaling air within the area by the flow of air sent out by the fan in the induction mixing means is limited to a small amount, and a large amount of air after mixing the air in the intake area by the induction mixing means is forced to pass through the temperature control means. In order to avoid the increase in pressure loss caused by this, it may be necessary to take additional measures such as increasing the size of the temperature control means to ensure a large cross-sectional area for air passage.

[0016] In this regard, if the above-mentioned third characteristic configuration in which the temperature control means is disposed upstream of the induced mixing means is adopted,
The resistance to the flow of air sent out by the fan in the induced mixing means can be made small, and the induction and suction of air within the area by the flow of air sent out by the fan in the induced mixing means can be made efficient. This makes it possible to more effectively achieve the objective of reducing the temperature difference between the blown air temperature and the temperature within the area while avoiding the need to increase the capacity of the fan. In addition, since the amount of air passing through the temperature control means is smaller than before the air amount is increased by mixing the air in the suction area with the induced mixing means, the pressure drop may be reduced, which may require additional measures such as increasing the size of the temperature control means. Increase can also be avoided.

[0017]

[Example] Next, an example will be explained.

In FIG. 1, reference numeral 1 denotes a ceiling-concealed fan coil unit installed in a room 2 to be heated and cooled, which takes indoor air A1 into a unit casing 5 from a main intake 4 provided in the ceiling 3, and A fan 7 blows the intake air A1 into the room 2 to be cooled and heated from an outlet 6 disposed in the vertical wall of the ceiling 3, and air A1 from the fan 7 (that is, air blown into the room 2 to be cooled and heated). A temperature control means 8 for controlling the temperature by heating or cooling is installed inside the unit casing 5.

As the temperature control means 8, a cold water coil 8C and a hot water coil 8H are arranged in series in the air passage 9 from the fan 7 in order to adopt a three-pipe type or a four-pipe type heating and cooling system. In a load situation where the indoor temperature Tr is lower than the target indoor temperature Ts artificially set by the temperature setting device 10, the controller 11 closes the chilled water supply amount adjustment valve Vc to the chilled water coil 8C and closes the hot water coil 8C. By adjusting the opening of the hot water supply amount adjustment valve Vh for 8H according to the deviation between the target indoor temperature Ts and the indoor temperature Tr detected by the room temperature sensor 12, and adjusting the heating amount of the hot water coil 8H for the fan delivery air A1, Temperature Tr is set to target indoor temperature Ts
In addition, in a load situation where the indoor temperature Tr is higher than the target indoor temperature Ts, the controller 11 closes the hot water supply amount adjustment valve Vh and closes the cold water supply amount adjustment valve V.
By adjusting the opening degree of c according to the deviation between the target indoor temperature Ts and the indoor temperature Tr detected by the room temperature sensor 12, and adjusting the amount of cooling of the chilled water coil 8C for the fan delivery air A1, the indoor temperature Tr becomes the target indoor temperature Ts. There is a configuration that maintains the adjustment.

In the above-mentioned delivery air path 9 leading from the fan 7 to the outlet 6, there is a sub-intake 1 separate from the main intake 4, through which room air A2 is supplied by the flow of the delivery air A1 from the fan 7.
The indoor air A2 is drawn in from fan 7.
An induced mixing means 14 is interposed to mix the air A1 sent from the fan, and the specific structure of the induced mixing means 14 is as shown in FIGS. 1, 2, and 3. A Venturi tube 15 in which a large number of cut and raised slit holes a extending in a direction perpendicular to the direction of the air flow are arranged in the flow direction of the fan air flow and is formed in the tube wall is inserted in the air flow path 9 from the fan 7, and A suction chamber forming box 16 surrounding the pipe 15 is provided, and the suction chamber forming box 16 and the above-mentioned sub-intake port 13 are connected as an air path to form the multiple slit holes a in the wall of the Venturi tube 15. is communicated with the room 2 to be heated and cooled via the sub-intake port 13.

In other words, the passage of the fan-delivered air A1 in the Venturi tube 15 causes an induced suction action to the inside of the tube through the multiple slit holes a, and this induced suction action causes indoor air A2 to be taken in as a sub-intake. The air is sucked into the suction chamber forming box 16 through the port 13 and into the Venturi tube 15 through the multiple slit holes a from inside the suction chamber forming box 16, and is mixed with the air A1 passing through the tube and being sent out by the fan. In this way, by mixing the indoor air A2 induced and sucked in by the induced mixing means 14 with the air A1 sent out from the fan 7, the temperature control means 8
The amount of blown air A3 from the air outlet 6 is increased relative to the amount of heating or cooling of the air outlet 6 to reduce the temperature difference dT between the blown air temperature To and the room temperature Tr as much as possible. This is to prevent the occupants in the room who are exposed to the blown air A3 from 6 from feeling hot, cold, or uncomfortable due to the large temperature difference dT between the blown air temperature To and the room temperature Tr.

In forming a large number of cut-and-raised slit holes a in the wall of the venturi tube 15, each cut-and-raised tongue piece b is placed in an inclined position such that the tip of the tongue piece is located on the downstream side in the flow direction of the air sent out by the fan. It is raised towards the inside of the pipe,
This enhances the induced suction function associated with the flow of air sent out by the fan.

Furthermore, the temperature control means 8 is designed so that it does not itself become a resistance to the flow of air sent out by the fan in the induction mixing means 14 and become a factor in reducing the induced suction function of the induction mixing means 14, and It is arranged on the upstream side of the induced mixing means 14 so that the amount of air passing through is as small as possible and the pressure loss caused by passing through the temperature regulating means is kept small.

In the figure, 17 is a filter provided at the main intake port 4, and 18 is a filter provided at the sub intake port 13.

Next, to explain the heating and cooling function of the fan coil unit 1 configured as above, by giving an example.
The heating amount of the hot water coil 8H is adjusted by adjusting the opening degree of the hot water supply amount adjusting valve Vh with the cold water supply amount adjusting valve Vc closed, and the indoor temperature Tr becomes the target indoor temperature Ts at that time.
Assuming that a person in the room changes the setting of the target indoor temperature Ts from 25°C to 21°C in a steady heating state maintained at 25°C, the controller 11 responds to this setting change.
closes the hot water supply amount adjustment valve Vh to cut off the hot water supply (e.g., 45°C hot water) to the hot water coil 8H, and on the other hand, opens the cold water supply amount adjustment valve Vc to supply cold water (e.g., 8°C) to the cold water coil 8C. As a result, the fan coil unit 1 enters an air cooling operation state (temporary cooling state) in order to quickly adjust the indoor temperature Tr from the current 25°C to the new target indoor temperature Ts of 21°C. .

[0026] With the start of this air cooling operation,
Indoor air A at 25℃ taken in from main intake 4
1 is cooled down to, for example, 17°C by passing through the cooling coil 8C. If the above-mentioned induction mixing means 14 is not provided, the air at 17°C will be directly blown into the room from the outlet 6, so that the indoor temperature Tr Although the temperature has not yet reached the desired temperature of 21°C, the occupants who are exposed to the blown air experience a large temperature difference dT of 8°C between the blown air temperature of 17°C and the indoor temperature of 25°C at the beginning of the air cooling operation. This may cause you to feel cold.

Here, by increasing the amount of air blown by the fan 7 and by increasing the temperature of the cold water supplied to the cold water coil 8C, the blown air temperature To and the indoor temperature Tr can be adjusted.
It is also possible to reduce the temperature difference dT between the fan 7 and the In order to avoid an increase in pressure loss due to an increase in the amount of air blown, it is necessary to make the cold water coil 8C and the hot water coil 8H large in size to increase the air passage cross-sectional area of the coil.
When increasing the temperature of the supplied cold water for C, simply increasing the temperature of the supplied cold water will reduce the cooling capacity and increase the time required to adjust the indoor temperature Tr to the desired target indoor temperature Ts. As expected, it is necessary to increase the capacity of the chilled water coil 8C and the fan 7, and as the required amount of chilled water supply increases, it is also necessary to increase the capacity of the chilled water supply pump and the diameter of the chilled water piping. (This also applies to the case where the temperature of the hot water supplied to the hot water coil 8H is lowered to reduce the temperature difference dT between the blown air temperature To and the indoor temperature Tr during air heating operation).

In this regard, in the fan coil unit 1 of this example provided with the above-mentioned induced mixing means 14, the indoor air A1 at 25° C. taken in from the main intake port 4 is cooled down to 17° C. by passing through the cooling coil 8C. 17 after passing through the chilled water coil 8C.
By mixing with fan delivery air A1 at ℃, it is possible to increase the capacity of the fan 7 as described above, increase the size and capacity of the chilled water coil 8C, increase the capacity of the chilled water supply pump, or increase the diameter of the chilled water piping. To set the blown air temperature To to such a value that the temperature difference dT from the indoor temperature of 25° C. is small, for example, 20° C., so that the occupants who are exposed to the blown air A3 do not feel very cold, while avoiding the problem of temperature change. Can be done.

[Another Example] Next, another example will be listed.

The specific structure of the venturi tube portion 15 constituting the induced mixing means 14 is as shown in FIG. 4, using a wire mesh 15a as a porous tube wall material, or as shown in FIG.
As shown in the figure, a fabric 15b is used as the porous tube wall material, and a core material 15 made of wire or the like is used to support this fabric 15b.
Various configuration changes are possible, such as adopting a structure in which c is provided.

In addition, when the above-described wire mesh 15a or cloth 15b is used as the porous tube wall material of the Venturi tube portion 15, these wire mesh 15a or cloth 15b can also be used as a filter for the induced intake air A2.

Instead of adopting a venturi tube configuration having the shape and structure as shown in FIGS. 3, 4, and 5, the induced mixing means 14 is constructed by using a venturi tube that communicates with the air-conditioned area 2 as shown in FIG. This box 16 is interposed in the air outlet path 9 leading from the fan 7 to the outlet 6.
Inside, the inlet of the downstream air passage 9b to the outlet 6 and the nozzle 14a which blows the fan air A1 into the inlet are arranged concentrically to face each other, so that the nozzle 14a blows the downstream air air out. As fan delivery air A1 is blown into the inlet of the air passage 9b, the air A2 within the air conditioning target area 1 is drawn in from the annular gap 14b between the inlet of the downstream delivery air passage 9b and the nozzle 14a. A configuration may be adopted in which the air A2 in the suction area is mixed with the air A1 ejected from the fan 7 from the nozzle 14a.
Various methods can be adopted as long as the induced suction effect is caused by the flow of the air A1 sent from the pump.

The temperature control means 8 is not limited to the cold water coil 8C or the hot water coil 8H, but may also be a coil using brine as a refrigerant or a direct expansion coil for cooling, or a steam coil or an electric heater for heating. , or a heater that uses combustion gas as a heating medium, etc. can be applied, and
The temperature control means 8 is not limited to one that can perform heating and cooling selectively, but may be one that can be used only for heating or only for cooling.

The temperature control means 8 may be arranged downstream of the induced mixing means 14 or upstream of the fan 7 depending on the case. Alternatively, the temperature control means 8 may be installed in a separate case connected to the case in which the fan 7 is installed via an extension duct.

The air A1 taken in by the suction action of the fan 7 is not limited to the air within the air-conditioned area 2, but may be a mixture of outside air and inside air, or only outside air. It may be a mixture of air that has been primarily treated by another air conditioner and air within the area, or it may be only the primarily treated air. .

[0036] Note that although reference numerals are written in the claims for convenience of comparison with the drawings, the present invention is not limited to the structure of the accompanying drawings.

[Brief explanation of the drawing]

[Figure 1] Cross-sectional view showing the overall device configuration

[Figure 2] Cross-sectional view of main parts

[Figure 3] Perspective view of main parts

[Fig. 4] Perspective view of main parts showing another embodiment

[Fig. 5] Perspective view of main parts showing another embodiment

[Fig. 6] Cross-sectional view of main parts showing another embodiment

[Fig. 7] Device configuration diagram showing a conventional example

[Fig. 8] Device configuration diagram showing another conventional example

[Explanation of symbols]

2 Air conditioning target area 6 Air outlet 7 Fan 8 Temperature control means 9　　　　　　　　　　　　　Blowout air path 14 Attraction mixing means 15 Venturi tube part A1 Fan delivery air A2 Area air

Claims (3)

[Claims] 1. An air conditioner provided with a fan (7) for blowing air whose temperature has been adjusted by a temperature control means (8) from an outlet (6) to an air-conditioned area (2), the fan (7) ) to the air outlet (6), the flow of the air (A1) from the fan (7) induces and sucks the air (A2) within the air conditioning target area (2). Air (A1) from the fan (7)
An air conditioner equipped with an induced mixing means (14) for mixing. 2. A Venturi tube portion (15) is provided in the outlet air path (9), and a porous portion formed in a tube wall of the Venturi tube portion (15) is communicated with the air-conditioned area (2). 2. The air conditioner according to claim 1, wherein said induced mixing means (14) comprises: . 3. The temperature control means (8) is arranged upstream of the induced mixing means (14).
The air conditioner described.