JP2005036780A - Wind-turbine generator system installed at exhaust opening - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a wind-turbine generator system without disturbing air-volume balance of an air-conditioning system. <P>SOLUTION: In the wind-turbine generator system installed at an exhaust opening, a side-opening is provided between the exhaust opening of the air-conditioning system and the blades of the wind-turbine generating part, and a range of an appropriate size of the side-opening is determined. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to a wind power generator system that is attached to an exhaust port of an air conditioning system or the like and effectively uses the energy of the exhaust.

  Conventionally, exhaust that has become unnecessary from the exhaust port of an air conditioning system or the like has been discharged outside the room, but has not been particularly utilized. This exhaust had a strong flow of gas, and it had problems such as giving an unpleasant sensation to people passing outside and warming the atmosphere with heat. In both cases, the energy contained in the exhaust was discharged without using it.

Problems to be solved by the invention

  In order to effectively use the energy of the exhaust, we focused on configuring the wind power generation system in consideration of the exhaust flow, but the wind power generator system without disturbing the balance of the flow rate, heat, etc. of the air conditioning system It has become an essential task.

Means for solving the problem

In this application, simulation is performed on the distance from the air outlet of the air conditioning system to the blades of the wind power generation unit and the wind receiving area of the blades, the distance that does not affect the balance of the flow rate of the air conditioning system, and the wind receiving area of the blades And realized a wind turbine generator system with an exhaust port.
The invention according to claim 1 is a wind power generator system with an exhaust port, wherein the rotating portion area (blade wind receiving area) of the blade of the wind power generator is the cross sectional area of the exhaust port (1-axis direction). It is characterized in that it is almost set to a value divided by the induction coefficient a).

According to a second aspect of the present invention, in the wind power generator system with an exhaust port according to the first aspect, the rotating portion area (blade wind receiving area) of the blade is 1.1-2. It is characterized by being set to 0 times.

The invention according to claim 3 is a wind power generator system with an exhaust port, the wind power generator system being attached to the exhaust port, wherein the position of the blade portion of the wind power generator is separated from the opening of the exhaust port. Thus, a side opening is provided, and a part of the exhaust gas is discharged from the side opening.

According to a fourth aspect of the present invention, in the wind turbine generator system with an exhaust port according to the third aspect, the distance between the opening portion of the exhaust port and the blade portion of the side surface opening portion is that of the exhaust port. It is set to 0.02 to 0.30 times the side or diameter of the opening.

The invention according to claim 5 is the wind turbine generator system with exhaust port according to claim 3 or claim 4, wherein the cross wind guide that collects the cross wind and promotes the rotation of the blade portion is used as the exhaust port or the exhaust port. It is characterized by being attached in the vicinity of.

Invention of Claim 6 is a wind power generator system with an exhaust port as described in any one of Claims 1-5, Comprising: The said blade | wing part has an auxiliary | assistant blade | wing which rotates in response to a cross wind. It is characterized by.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 3 is a diagram for explaining conditions that do not affect the displacement of an embodiment of the present invention. Blade portion 32 of the wind power generator (rotation unit area A of the blade) is placed in the space 31 of the cross-sectional area A _0, it is smoothly connected therebetween. The rotation part area of a blade | wing here means not the area of blade | wing itself but the whole area which a rotation part passes by rotation, and is called a wind receiving area below. In the space 31, air flows at a speed V ₀ , and after passing through the blades, the speed decreases to V. Here, when the axial direction induction coefficient a is introduced into the speed reduction rate as the equation (1), the energy P obtained from the air flow is represented by the equation (2) where ρ is the air density. Here, when a = 1/3, the energy becomes the maximum value. In such a case, the area relationship is expressed by equation (3), and if the size of the blade is greater than or equal to equation (4), the presence of the blade is not a load on the air flow in the space. Note that the √ symbol in the expression (4) represents the square root applied in the parentheses thereafter. Such circumstances are described in pages 50 to 52 of the literature: Introduction to Windmill Engineering (Izumi Ushiyama, Morikita Publishing).

Number 1

a = 1-V / V ₀ (1)

Number 2

P = {4a (1-a) ² } (1/2) ρAV ₀ ³ (2)

Number 3

A = A ₀ / (1-a) (3)

Number 4

√ (A ₀ / (1-a)) (4)

Now consider the case of attaching a blade of a wind power generator in an air stream to be discharged to the exhaust port, considering the area of the exhaust port and A _0, the area of the blade formula (3), the cross section of the exhaust port square If one side of the area of the blade is set as in equation (4) and smoothly connected to the exhaust port, the presence of the blade does not become a load for the air flow at the exhaust port. For example, when a = 1/3, A = 1.5A ₀ , and the length of one side of the section with blades may be 1.22 times the length of one side of the exhaust port. against a = 0.1~0.5, the _A = (1.1~2.0) A _0.

  4 and 5 show the situation when a blade portion having the same area as that of the exhaust port is attached so that the blades of the wind power generator can be easily installed in the exhaust port. FIG. FIG. 5 shows a case of a circle and a rectangle. Since the area of the blade portion is smaller than the value represented by Equation (3), the presence of the blade is a load for the air flow at the exhaust port. For this reason, a side opening must be provided in order to allow a flow rate corresponding to the insufficient area to flow. Even if the side opening is unnecessarily large, the flow rate hitting the blade is reduced, and the size is increased, which is not preferable. Since there is an appropriate size range, the set values were determined using the quantities shown in FIGS. The result of the determination will be described below.

Referring to FIG. 4 as an example, the air passes through the exhaust duct 41 having substantially the same area A as the wind receiving surface where the blades 42 of the generator are located at a speed V ₀ , and the blades at a position separated by a distance L (side opening 43). It flows into the part 42. Velocity of air passing through the duct before passing through the blade unit 42 is V _0. The speed after passing through the blade is V. On average, it can be estimated by assuming that air flows out from the side opening 43 at a speed of (V + V ₀ ) / 2. Further, the side opening is approximated to a cylindrical side surface having the diameter of the blade wind receiving surface as a diameter, and the expected distance through which air passes is L cos 45 °.

Hereinafter, the relationship between each flow rate at the exhaust port will be described with respect to the circular duct and the rectangular duct of FIGS. Using equation (1), the flow rate input to the exhaust port is such that the cross-sectional area of the circular duct is A and the cross-sectional area of the rectangular duct is 4 A / π with respect to the area A of the wind receiving surface. If the calculation is advanced in consideration of the above, it is AV ₀ for the circular duct and 4 AV ₀ / π for the rectangular duct.
The wind-receiving surface flow rate that comes out behind the blades is AV for both the circular and rectangular ducts.
The flow rate from the side opening is as shown in Equation (5) for a circular duct, and as shown in Equation (6) for a rectangular duct (the area of the side opening is expressed as an average of the circular portion and the rectangular portion). Become. If the ratio of the sum of the other two to the flow rate from the exhaust port is expressed as the flow rate share k, Equation (7) and Equation (8) are obtained for the square duct and the circular duct, respectively. When k is smaller than 1, it indicates that the flow of exhaust is affected, and that the amount of exhaust of incoming exhaust is limited. For example, in the case of 0.9, 10% corresponds to a slower exhaust speed. The limit k is determined according to how far this value is acceptable. When k = 1, it is shown that the installation of the blades has no influence on the exhaust flow. If there is no margin in the exhaust capacity, k = 1 may be set.

Number 5

(V + V ₀ ) / 2 · 2π√ (A / π) · Lcos 45 ° = V (1 + 1 / (1-a)) / 2 · 2π√ (A / π) · Lcos 45 ° (5)

Equation 6

(V + V ₀ ) / 2 · (π + 4) √ (A / π) · Lcos 45 ° = V (1 + 1 / (1-a)) / 2 · (π + 4) √ (A / π) · Lcos 45 ° (6)

Number 7

k = (1-a) · [1 + √ (π / A) · {1 + 1 / (1-a)} L cos 45 °] (7)

Number 8

k = π (1-a) / 4 · [1+ (π + 4) / 2 · √ (π / A) · {1 + 1 / (1-a)} L cos 45 °] (8)

  When the side surface opening distance L is obtained for the square duct and the circular duct from the expressions (7) and (8), the expressions (9) and (10) are obtained, respectively.

Number 9

L = 2√ (A / π) {k / (1-a) -1} / 2 / {1 + 1 / (1-a)} / cos 45 ° (9)

Number 10

L = 2√ (A / π) {4k / π / (1-a) -1} π / (π + 4) / {1 + 1 / (1-a)} / cos 45 ° (10)

When the coefficients in the expressions (9) and (10) are expressed as Sc for the circular duct and Sr for the rectangular duct as the side opening distance coefficient, respectively, the expressions (11), (12) and Become.

Equation 11

Sc = {k / (1-a) -1} / 2 / {1 + 1 / (1-a)} / cos 45 ° (11)

Number 10

Sr = {4k / π / (1-a) -1} π / (π + 4) / {1 + 1 / (1-a)} / cos 45 ° (12)

When this is calculated with respect to a using k as a parameter, Table 1 and Table 2 are obtained.

As described above, when the axial induction coefficient a is 1/3, the obtained energy is the maximum. For example, in the case of k = 1, in the circular duct and the rectangular duct, the values of S are 0.15 and 0.17, and the side opening distance is about 0.15 times the length of one side of the cross section of the exhaust port. do it. That is, it is ideal to install the blade portions 30 cm apart at the 2 m × 2 m exhaust port. In Tables 1 and 2, so-called usable conditions in which the blades of the wind power generation unit can be installed without affecting the air flow from the exhaust port, even if not ideal, are determined. Considering 0.3 ± 0.2 as the value of a around the ideal value,
When k = 0.95 is allowed, 0.21 ≧ S ≧ 0.02,
When k = 1.00 is allowed, 0.25 ≧ S ≧ 0.03,
Therefore, if the side opening distance calculated in the range of 0.02 to 0.30 is applied as S, the installation of the blades can be used without substantially affecting the flow of the exhaust.

In the above description, the area of the blade part has been described in that the area through which the rotating part of the blade passes is approximately equal to the cross-sectional area of the exhaust port, but the cross-sectional area of the attachment part of the blade part is approximately equal to the cross-sectional area of the exhaust port. It seems to be convenient to install. In such a case, the wind receiving area through which the blades pass is smaller than the cross-sectional area of the exhaust port, but in this case as well, the side opening is only increased, and the range of the side opening distance coefficient S described above It is possible to cope with the setting. Of course, the side opening has an effect of reducing the load on the exhaust even when the area of the blade is larger than the cross-sectional area of the exhaust.

  FIG. 1 is a diagram showing an embodiment of the present invention, in which a wind power generator 11 is attached to an exhaust port 13 of an exhaust duct 12 and is 30 cm for a side opening with respect to a 2 mx 2 m exhaust port. A wind generator is installed at a distance. FIG. 2 is a diagram similarly showing an embodiment of the present invention, in which a plurality of wind power generators 21 are integrated and attached.

  FIG. 6 shows a further development of the present invention, in which a generator 60 having blades 61 and a power output line 62 of the generator is attached to an exhaust duct 63 at a distance of the spirit of the invention. It is. From the exhaust duct 63, exhaust gas is blown out so as to turn the blades 61 of the generator as indicated by an arrow 64. The exhaust duct 63 further includes a cross wind guide 65 attached in a skirt shape, which facilitates collecting the cross wind 66 and rotating the blade portion 61 in cooperation with the exhaust 64. In this configuration, the blade portion 61 rotates with the assistance of the cross wind and assists in sucking the exhaust 64, so that the load attached with the generator is further reduced. The cross wind guide 65 can be attached to the vicinity of the exhaust duct 63, for example, a member that supports the generator 60, or can be installed in the surroundings without contact. The blade portion 61 is additionally provided with an auxiliary blade 67 having a large number of blades rotating by the cross wind 66. This is advantageous in that the rotation can be further increased.

The invention's effect

As described above, the rotating part area of the blades of the wind power generator installed at the exhaust port is determined in relation to the cross-sectional area of the exhaust port according to the equation (3), or has substantially the same area, Since the side opening is provided, the installation of the blades can substantially avoid the influence of the exhaust flow, and it is possible to generate power by attaching a wind power generator to the exhaust port.
Furthermore, in the configuration in which a guide for collecting the cross wind in the exhaust duct to assist the rotation of the blades of the generator is provided, the load on the exhaust can be further reduced.

    It is a perspective view which shows one embodiment of the wind power generator system with an exhaust port which concerns on this invention.     It is a perspective view which shows another embodiment of the wind power generator system with an exhaust port which concerns on this invention.     It is explanatory drawing for the calculation of the influence on the displacement of the wind power generator system machine with an exhaust port concerning this invention.     It is explanatory drawing for setting the distance which designates the side surface opening part in a circular duct in the wind power generator system with an exhaust port which concerns on this invention.     It is explanatory drawing for setting the distance which designates the side opening part in a rectangular duct in the wind power generator system with an exhaust port which concerns on this invention.     It is a figure which shows the embodiment which has a cross wind guide in a duct in the wind power generator system with an exhaust port which concerns on this invention.

Explanation of symbols

11, 21 ... wind turbines 12,41,63 ... exhaust duct 13 ... exhaust port, 31 space 32,42,61 ... wing section of ... cross-sectional area _{A 0,} 43 · .. Side opening, 60 ... Generator 62 ... Power output line, 64 ... Arrow indicating exhaust, 65 ... Cross wind guide 66 ... Cross wind, 67 ... Auxiliary blade

Claims (6)

A wind power generator system attached to an exhaust port, wherein the blade rotating portion area (blade wind receiving area) of the wind power generator is divided by the cross-sectional area of the exhaust port by (1-axial induction coefficient a). A wind power generator system with an exhaust port, characterized in that it is almost set to the measured value. The wind turbine generator system with an exhaust port according to claim 1, wherein an area of the rotating portion (blade wind receiving area) of the blade is set to 1.1 to 2.0 times a cross-sectional area of the exhaust port. . A wind power generator system attached to an exhaust port, wherein a side opening is provided by separating a position of a blade portion of the wind power generator from an opening of the exhaust port, and a part of the exhaust is discharged from the side opening. A wind power generator system with an exhaust port, characterized by being configured to discharge. In the side opening, the distance between the opening of the exhaust port and the blade is set to 0.02 to 0.30 times the side or diameter of the opening of the exhaust port. The wind turbine generator system with an exhaust port according to claim 3. 5. The wind turbine generator system with an exhaust port according to claim 3, wherein a lateral wind guide that collects a lateral wind and promotes rotation of the blade portion is attached to the exhaust port or the vicinity of the exhaust port. 6. The wind turbine generator system with an exhaust port according to claim 1, wherein the blade portion includes an auxiliary blade that rotates by receiving a cross wind.

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