JP2004101057A - Personal air-conditioning unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively and comfortably perform partial cleaning or partial air-conditioning by providing a blower unit for blowing blowoff air flow from an air blowoff port at low air speed with uniform air speed distribution. <P>SOLUTION: This personal air-conditioning unit has a cover 1 for an air intake port for taking in air; a cross flow fan 3 and vanes 5 for taking in the air and producing the air of uniform air quantity and air speed within the plane of the air blowoff port from a cover 2 serving as the air blowoff port; a filter 4 interposed between the air intake port and the blowing part to clean the air; and a filter 6 provided inside the cover 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a personal air conditioning unit used as an air purifier or an air conditioner.
[0002]
[Prior art]
Conventionally known air purifiers, air conditioners and the like are provided with an air filtering means or a heat exchanger, which is a ventilation resistor, so as to face an air suction port of a main body having a built-in blower. It functions as a blower unit that blows clean air that has passed through the means or temperature-controlled air that has passed through the heat exchanger from the air outlet.
The blower unit having the above-described configuration is used for the purpose of, for example, purifying the air in the entire living space or adjusting the temperature, so that the blown air is blown out so as to be easily diffused throughout the living space. The wind speed is set to be large (for example, Patent Document 1).
[Patent Document 1]
JP 2000-115876 A (page 2, FIG. 1)
[0003]
[Problems to be solved by the invention]
By the way, taking an air purifier as an example, there are individual differences in sensitivity to allergic substances and volatile organic substances, and if the cleanliness is determined according to the average sensitivity, sensitive people do not feel clean. Determining the cleanliness of a living space for the most sensitive people can be inefficient.
Further, even if the room is clean, if the source of the allergen is near a person, the effect of the air purifier may be reduced. For example, when the bun is a source of allergens such as mites, the allergen from the bun is directly inhaled by the sleeping person at bedtime, causing allergic symptoms.
[0004]
Therefore, when applying an air purifier to a local air purifier, for example, to a bedside or a desk side, a high-speed blown air stream directly hits a body, which may cause discomfort or a feeling of cold. is there. Even if the rotation speed of the blower is controlled to reduce the wind speed in order to cope with such a problem, if the area of the air outlet is small, the clean region becomes too local, which is difficult to use.
[0005]
In order to solve the above-mentioned problems, the area of the air outlet may be increased as much as possible to reduce the blown air velocity.
However, in the conventional example, since the air sucked in using the axial blower is blown as it is, the flow of the air supplied from the blowout port becomes a swirling flow, and it is considered that the mixing with the surrounding air proceeds.
For this reason, at a low wind speed, even if it is arranged on the desk, the mixing ratio with the surrounding air increases within a certain distance range.
[0006]
The present invention has been made in view of the above points, and provides a blower unit in which an airflow blown from an air outlet is blown at a low wind speed and with a wind speed distribution as uniform as possible. Is intended to be able to be performed effectively and comfortably.
[0007]
[Means for Solving the Problems]
The personal air-conditioning unit of the present invention has an air intake port for taking in air, and a blower section that takes in the air and generates and blows a uniform amount of air and a uniform velocity in the plane of the air outlet from the air outlet. And a filter interposed between the air intake and the air blower for purifying the air.
[0008]
In the personal air conditioning unit of the present invention, the area of the air outlet is
(Vx / V0) = K (D0 / X)
X: Distance from the outlet [m]
Vx: Maximum wind speed at distance X [m / s]
V0: Wind velocity at outlet [m / s]
D0: Effective diameter of outlet [m]
K: outlet constant
Nozzle (circular, square) $ 5.0
Rectangular nozzle (aspect ratio <40) $ 4.3
Grill, register $ 4.1
It is characterized by the following arithmetic expression.
[0009]
The personal air-conditioning unit according to the present invention is characterized in that the blower unit blows low-speed wind having no swirling flow.
Here, the low wind speed refers to a wind speed of 0.5 m / s or less as a guideline determined from the viewpoint of preventing a draft feeling of a human body.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention satisfies the first zone (Core Zone or Potential Zone) where the clean air exiting from the air outlet of the personal air-conditioning unit is less mixed with the surrounding air to satisfy the intake area of the user. That is, the personal air conditioning unit is arranged at the position of the wall or the partition.
Here, the first region is defined as a region where the airflow from the nozzle outlet is (Vx / V0) = 1 in the equation (1).
When the personal air-conditioning unit is used by arranging it on a desk, it is necessary to secure at least 1.0 m as a workspace from the outlet of the air purifier to a place where a person sits.
[0011]
Here, the effective diameter of the outlet of the personal air conditioning unit is 25 cm according to the following equation (1).
A personal air-conditioning unit with a large opening with an effective diameter of 25 cm or more can ensure essential breathing air quality for humans in a workspace within 1.0 m from the outlet, regardless of the blowing speed (blowing speed). Become.
That is, regardless of the air conditioning system of the ambient air conditioning, the air conditioner can be generally used for each individual.
[0012]
(Vx / V0) = K (D0 / X) (1)
X: Distance from the outlet [m]
Vx: Maximum wind speed at distance X [m / s]
V0: Wind velocity at outlet [m / s]
D0: Effective diameter of outlet [m]
K: outlet constant
Nozzle (circular, square) $ 5.0
Rectangular nozzle (aspect ratio <40) $ 4.3
Grill, register $ 4.1
(This outlet constant is a value present in the airflow in the Handbook of the Japan Society of Air Conditioning and Hygiene, and similarly, the same description is given in the handbook of the American Society of Air Conditioning (ASHRAE HAND-BOOK).)
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram showing the configuration according to the first embodiment of the present invention.
In this figure, in order to explain the internal structure, it is shown in a state of being transmitted through a side cover.
The cover 1 (suction port, air intake port) is provided on the upper part of the personal air-conditioning unit T, is a grill type (with a slit-shaped hole), and serves as an air intake port.
The cover 2 (air outlet) is a grill type like the cover 1 and is provided on the front surface of the personal air-conditioning unit T, and serves as an outlet for purified air.
The personal air-conditioning unit T is in a closed state with respect to portions other than the covers 1 and 2 described above.
[0014]
The cross flow fan 3 is rotated in the direction of arrow F by a motor or the like (not shown) to supply the air input from the cover 1 to the vane 5 through the filter 4 at a predetermined air volume.
The filter 4 is a HEPA (dust collection) filter, which is supplied (inhaled) with air sucked from the cover 1 from one surface (upper surface) and removes pollen, house dust, and the like from the other surface (lower surface). Supply clean air that has been cleaned.
[0015]
The filter 6 has the same size as the area of the cover 2, and is provided so as to be interposed between the inner surface of the cover 2, that is, between the vane 5 and the cover 2.
The filter 6 is a ULPA (ultra low penetration air) filter for repairing submicron aerosols, and a filter for adsorbing or decomposing an adsorbing substance such as activated carbon, or a volatile organic gas by a catalytic reaction.
The filter 6 is disposed at a site (place) where the cross-section passing wind speed is low (low wind speed), thereby effectively removing contaminants.
[0016]
The vanes 5 are formed in a structure in which a substantially constant air volume is supplied from a region where the shape of each vane is separated.
That is, the clean air is guided by the vane 5 bent from a portion having a small flow cross section below the cross flow fan 3 to an outlet (cover 2) at a front portion of the personal air conditioning unit T having a large flow cross section. Be blown out.
Here, the structure of the vane 5 is configured such that by providing a plurality of vanes 5, the wind blown from the outlet is divided into a plurality of regions, that is, separated into a plurality of outlets by the plurality of vanes 5. .
Although not shown accurately in FIG. 1, the curvature of the bending of each vane 5 and the area of the intake of the air supplied from the cross flow fan to the area partitioned by the vanes 5 are defined by the vanes. 5 is configured such that the wind speed and the air volume blown out from the outlets of the respective regions are substantially constant.
[0017]
With the above-described configuration, in the process in which the clean air is guided from the portion having a small cross-sectional area to the outlet having the large cross-sectional area, the swirling component of the air flowing out of the cross flow fan 3 is attenuated, and the turbulence intensity is also attenuated. In addition, a low-velocity wind having a uniform distribution of the wind speed and the air volume is supplied, and the clean air which is not mixed with the surrounding air is blown out to the user.
In the conventional example, since the air sucked in using the axial fan is blown out as it is, it is considered that the air becomes a swirling flow and the mixing with the surrounding air proceeds.
The personal air-conditioning unit T can adjust the wind speed (V0) by controlling the rotation speed of the cross flow fan 3, and by adjusting the wind speed, adjusts the amount of convective heat dissipation of the human body, that is, adjusts the thermal sensation of the human body. It can be performed.
[0018]
As described above, one embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and there are design changes and the like within a range not departing from the gist of the present invention. Are also included in the present invention.
The configuration in the second embodiment shown in FIG. 2 is also possible.
The air conditioning unit 13 for generating the air flow in a constant area unit at a constant flow rate in FIG. 2 has a structure described with reference to FIGS.
FIG. 3 is a perspective view schematically showing the structure of a panel-type windmill device (impeller) 10 arranged inside FIG. 2, and FIG. 4 is a perspective view showing a moving blade unit 50 incorporated in the windmill device 10. FIG. 5 is a plan view showing a main part of the wind turbine device 10, and FIG. 6 is a side view of the wind turbine device 10. In these figures, arrows XYZ indicate three directions orthogonal to each other, and in particular, arrow XY indicates a horizontal direction, and arrow Z indicates a vertical direction. Arrow W indicates the direction of the wind.
[0019]
The wind turbine device 10 includes a main driving unit 20, a sub-driven unit 30, a phase adjustment unit 40, and a plurality of moving blade units 50. The front side to which the wind W is input is the outside and the back side is the room.
The main drive unit 20 includes eight main drive shafts 21a to 21h, a pair of main drive wheels 22a to 22d, and 23a to 23d attached to the main drive shafts 21a to 21d and 21e to 21h, respectively. A main rope 25 is provided to extend over the main drive wheels 23a to 23d. Main rope joints 27 are provided at predetermined intervals on the main ropes 25 and 26, and both ends of a blade shaft 52 of a moving blade 51 described later are rotatably supported. In addition, output shafts 28 and 29 as main drive shafts are provided between the main drive shafts 21a and 21b and between 21c and 21d, and main cables 25 and 26 are respectively provided on the output shafts 28 and 29. Bridged output wheels 28a, 28b and 29a, 29b are provided.
[0020]
The sub driven portion 30 includes eight sub driven shafts 31a to 31h, sub driven wheels 32a to 32d, 33a to 33d attached to the sub driven shafts 31a to 31d, 31e to 31h, respectively, and a sub driven wheel 32a to 32d. The vehicle includes a sub rope 35 extended over 32d, and sub ropes 35 and 36 extended over sub driven wheels 33a to 33d. Ring portions 37 are provided on the sub rope 36 at predetermined intervals.
[0021]
The phase adjustment unit 40 includes a main phase adjustment wheel 41 attached to the output shaft 28, a sub phase adjustment wheel 42 attached to the sub driven shaft 31e, and a second The vehicle includes a first adjustment wheel 43, a second adjustment wheel 44, and a timing belt 45 stretched over these wheels.
[0022]
The moving blade unit 50 includes a panel-shaped moving blade 51, a blade shaft 52 serving as a rotation axis of the moving blade 51, and a sub-cord connecting stay 53 attached to the blade shaft 52. The upper surface of the rotor blade 51 is denoted by 51a, and the lower surface is denoted by 51b. An elongated hole 54 is provided in the auxiliary cable joining stay 53, and a ring portion 37 described later is slidably joined. That is, the inclination (pitch angle θ) of the moving blade 51 is determined by the fact that the blade axis 52 is attached to the main ropes 25 and 26 and the sub-coupling stays 53 are attached to the sub-coils 35 and 36. It is determined according to the positional relationship between the sub ropes 35 and 36.
[0023]
In these drawings, the number of the moving blades 51 is omitted for the sake of explanation of the structure, but actually, for example, the moving blades 51 are installed at intervals substantially equal to the depth width of the moving blades.
The wind turbine device 10 configured as described above operates as follows. The angle of the moving blade 51 is adjusted by the phase adjusting unit 40 in advance. That is, by moving the positions of the first adjustment wheel 43 and the second adjustment wheel 44, the timing belt 45 is moved, and the phases of the main phase adjustment wheel 41 and the sub phase adjustment wheel 42 are changed. Accordingly, the relative positions of the main ropes 25 and 26 and the sub ropes 35 and 36 in the traveling direction change, and the pitch angle θ of the moving blade 51 changes as described above.
[0024]
The pitch angle θ is set to, for example, 30 °. When the output shaft 28 is driven by a motor (not shown) or the like, the main drive wheels 22a to 22d and 23a to 23d and the output wheels 28a, 28b, 29a and 29b rotate, so that the main ropes 25 and 26 are turned by arrows in FIG. Move in β direction. The rotational force of the main drive wheels 22a to 22d, 23a to 23d and the output wheels 28a, 28b, 29a, 29b is transmitted to the sub driven wheels 32a to 32d, 33a to 33d via the phase adjustment unit 40, and the sub ropes 35, 36 are provided. Also moves in the direction of arrow β in FIG. That is, the sub ropes 35 and 36 also move in synchronization with the main ropes 25 and 26, and the rotor blades 51 move from the lower end to the upper end of the wind turbine device 10 while maintaining the pitch angle θ. Thereby, a force in the direction of the arrow β in FIG. 5 acts on the lower surface 51b of the rotor blade 51 located on the front side, and moves the air to generate the wind W.
That is, the air moves due to the movement of the moving blade 51 in the β direction, and the wind W is generated.
[0025]
The moving blade 51 reaching the upper end passes over the main driving wheels 22a, 22b, 23a, 23b, the output wheels 28a, 28b, and the sub driven wheels 32a, 32b, 33a, 33b, and moves to the far side of the windmill device 10. I do. Then, the wind turbine device 10 moves from the upper end to the lower end while maintaining the pitch angle θ.
The main drive wheels 22a to 22d, 23a to 23d and the output wheels 28a, 28b, 29a, 29b rotate, and the main ropes 25, 26 move in the direction of arrow γ in FIG. Thereby, the upper surface 51a of the moving blade 51 also moves, so that a force acts in the direction of arrow γ in FIG. 3 to move the air and generate the wind W.
[0026]
As described above, by driving (rotating) the output shaft 28, the main drive wheels 22a to 22d, 23a to 23d and the output wheels 28a, 28b, 29a, 29b rotate, and the rotation speed of the output shaft 28 It is possible to generate a wind W having a flow rate according to the above.
When the pitch angle θ is 0 °, almost no air hits the moving blade 51 and no wind is generated. On the other hand, when the pitch angle θ is 90 °, no force acts on the moving blade 51 in the direction in which the main ropes 25 and 26 are driven, and the moving blade 51 has a rectangular panel shape and intersects with the flow direction. , The wind flow path is closed.
[0027]
As described above, by adjusting the pitch angle θ, it is possible to adjust the flow rate and the flow velocity of the output wind.
Returning to FIG. 2, in the personal tone unit T, the above-described air conditioning unit 13 is arranged so that the wind W is blown toward the cover 12.
Here, the covers 11 (inlet) and 12 (outlet) are of a grill type, like the covers 1 and 2 in the first embodiment.
When the air conditioning unit 13 is driven, the air flowing from the cover 11 is cleaned by passing through the filter 14 (similar to the filter 4) and the filter 16, and is supplied from the cover 12 to the outside.
[0028]
The filter 16 has the same size as the area of the cover 12, and is provided on the inner surface of the cover 2, that is, provided between the air conditioner 13 and the cover 12.
The filter 16, like the filter 6 of the first embodiment, absorbs or decomposes an ULPA filter for repairing submicron-class aerosols, an adsorbent such as activated carbon, or a volatile organic gas due to a catalytic reaction. Filter. The filter 16 is installed at a site (place) where the cross-section passing wind speed is low (low wind speed), thereby effectively removing contaminants.
[0029]
The clean air generates the wind W by the movement of the moving blades 51 distributed at predetermined intervals in the surface of the cover 12 by the air conditioning unit 13, so that the air volume and the air flow in the surface of the cover 12 are the same as in the first embodiment. Since the wind speed is supplied in a substantially uniform distribution state, there is no swirling flow when an axial fan (axial blower) is used, and a wind having a uniform air volume in the plane of the cover 12 is supplied, and the turbulence intensity is increased. Because it is also small, it is blown out without mixing with the surrounding air.
The personal air-conditioning unit T can adjust the wind speed (V0) by controlling the number of revolutions of the output shaft 28. By adjusting the wind speed, it is possible to adjust the amount of convective heat dissipation of the human body, that is, to adjust the thermal sensation of the human body. It can be carried out
[0030]
The present invention is not limited to the above embodiment. That is, in the above-described embodiment, four small main drive wheels and two sub driven wheels are arranged on one side, but two main drive wheels and two sub driven wheels are arranged on one side. The shape and quantity of are not particularly limited. In addition, it goes without saying that various modifications can be made without departing from the spirit of the present invention.
[0031]
In both the first embodiment and the second embodiment, it is necessary to use them in a region satisfying (Vx / V0) = 1 in Expression (1).
That is, it is necessary to design the personal air-conditioning unit by adjusting each parameter (X, K, D0) so that (Vx / V0) = 1 in the region to be used.
In the above equation (1), when (Vx / V0) = 1 is satisfied, the turbulence intensity of the blown wind (the strength of turbulence of the air) is small, and it is difficult to mix with the surrounding air.
At this time, if the wind blown out from the personal air conditioning unit is used at a low wind speed, the mixing with the surrounding air can be more effectively reduced.
Here, the low wind speed indicates that the wind speed is equal to or lower than the draft wind speed.
Draft wind speed is, in the indoor environment design, when the wind speed exceeds 0.5 m / s, the person hit by the wind feels discomfort, and the airflow velocity in the space where the human is actually active is 0.5 m / s or less. Since it is recommended, this wind speed of 0.5 m / s is referred to.
Therefore, the low wind speed indicates a wind speed of 0.5 m / s or less.
[0032]
As a result, the air sucked in from the suction ports (covers 1 and 11) is cleaned by the filter, and the purified air blown from the large opening outlets (covers 2 and 12) is cleaned in the surrounding area. The air can be supplied (blowed) to the position in the expression (1) without being mixed with much air.
And by making the blowing wind speed of the purified air coming out of the outlet into a low wind speed, the purified air becomes more difficult to mix with the surrounding air, and covers the breathing area of the user, Since it acts as an air curtain for the surrounding air, it is possible to improve the quality of breathing air.
Further, by providing the covers 1 and 11 serving as the air suction ports above the personal air-conditioning unit, the unit can be installed in close contact with a wall or a partition of a desk, thereby avoiding useless use of the workspace. There is.
[0033]
Next, a simulation performed to show the effect of the present invention will be described.
Attempts are being made to control the thermal comfort of individual office workers and to ensure the quality of breathing air by personalizing air conditioning.
As a result, various personal air-conditioning units have been proposed, but most of these studies did not reproduce the effects of heat rise around the human body or the effects of breathing on respiratory air quality, such as the age of the air in the inhalation region of the human body. The respiratory air quality of the human body is evaluated by paying attention to the ventilation efficiency index.
At that time, the blowing properties of personal air conditioning are often determined mainly by focusing on the thermal sensation of the human body.
The purpose of this analysis is to study a personal air-conditioning unit that is effective for improving the respiratory air quality of the human body by directly sending a large amount of purified clean air to the respiratory region of the human body.
[0034]
The amount of air blown from the personal air-conditioning unit T is determined from various viewpoints, but it seems reasonable to use the amount of breathing of the human body (6.0 liter / min) 15) as one standard.
In this analysis, the flow rate of about 200 times the respiratory flow rate was used as the air flow rate for personal air conditioning, and when the human body was breathing (here, steady inhalation), the air flow rate was constant for personal air conditioning with an isothermal air flow, and the difference in wind speed was significant. The effect of air on respiratory air quality will be examined in detail by CFD (Computational Fluid Dynamics).
[0035]
・ Analysis summary
1) Analysis target space
Assuming the inside of an office, a case where a human body model is seated on a desk (desk) partitioned by partitions as shown in FIG. 7 is analyzed.
A wall-mounted room air conditioner will be provided for ambient air conditioning.
The personal air-conditioning unit T in the task area blows purified air from the front of the unit to the front of the human body, and sucks (takes) air from the upper surface of the unit. (In this analysis, the heat generation of peripheral OA equipment is not considered.)
[0036]
2) Analysis case
This analysis is performed in each case of Table 1 shown in FIG.
It is assumed that Case uses only ambient air-conditioning, and Case2 and Case3 use ambient air-conditioning similar to that of Casel and also uses an isothermal personal air-conditioning unit T as task air-conditioning.
The blowing air velocity of the personal air conditioner is 0.5 m / s (Case 2) and 6.0 m / s (Case 3), respectively. The distance from the outlet surface to the human body is about three times the effective diameter of the outlet in the former, and the latter in the latter. It becomes about 10 times.
[0037]
3) Outline of CFD model and boundary conditions
Flow field analysis is based on a standard k-ε model. A steady-state solution is calculated using a primary upwind scheme for the advection term of the k-ε equation.
The boundary conditions are shown in Table 2 of FIG. The outlet temperature of the personal air conditioner is set to be equal to the inlet temperature of the personal unit, and set so as to provide an isothermal outlet airflow. As for the respiration of the human body, a steady inspiration is assumed as in the separate report 11).
Here, the area of the outlet of Case 2 is 0.2 mx 0.24 m, and the area of the outlet of Case 3 is 0.05 mx 0.08 m. The air volume is 0.024 cubic m / sec similarly for Cases 2 and 3.
[0038]
The inhalation of the human body model is performed through the nose, and the steady-state inhalation amount is given as a boundary condition so as to be 14.4 (liter / min).
For all solid surfaces, a generalized log law is applied to the wind speed, including the surface of the human body.
As a boundary condition of the surrounding temperature, the wall surface of the room and the furniture surface are insulated. The heat generation on the human body model surface gives the total amount of convective heat transfer (33.8 W / person) as 22.8 W / m2.
[0039]
4) Respiratory air quality evaluation index
The evaluation of the respiratory air quality of the human body is performed using the ventilation efficiency index SVEs (Scale for ventilation Efficiencies) and CRP (Contribution Ratio of Pollution Source) shown below.
(1) Inhalation area (SVE5): The area (range) where the human body inhales is evaluated by regarding the nostril inhaling as an inlet. The numerical value indicates the proportion of the air in that portion that is inhaled by the nostrils.
(2) Age of air (SVE3): The time required for fresh air introduced into the room to reach a certain position (point) is evaluated with respect to a nominal ventilation time (reciprocal of the number of times of ventilation).
(3) Life expectancy (SVE6): The time required for air to pass through a certain position (point) and be discharged from the room is evaluated relative to the nominal ventilation time.
(4) Contamination contribution ratio CRPI: It indicates how much (%) of the amount of contamination generated by a certain contamination source is sucked into the human body.
[0040]
·Analysis result
1) Scalar wind speed distribution
As shown in FIG. 10, the wind speed distribution by the ambient air-conditioning is substantially the same in all Cases (1 to 3).
Here, in the case of Case 1, the airflow from the outlet of the ambient air conditioning is blocked by the partition, the surroundings of the human body are almost in a calm environment, and a heat rising flow is formed above the head of the human body.
In Case 2, clean air is blown from the personal unit at a low wind speed of 0.5 m / s, and an airflow field of about 0.14 m / s is formed around the face of the human body. At this time, the heat rising flow of the human body occurs at the back of the head.
[0041]
In the case of Case 3, it can be seen that a large wind speed is generated around the human body by the clean air blown at a high wind speed of 6.0 m / s, and the mixing of the blown airflow with the surrounding air is promoted.
In addition, Case 2 has a larger outlet opening (effective diameter of the outlet) than Case 3, and the Core Zone and the Transition Zone of the outlet air flow reach closer to the chest of the human body model. It can be seen that the transportation was good up to the intake area of the.
[0042]
2) Temperature distribution (Fig. 11)
The air heated by the heat of the human body is transported to the ceiling in the room by buoyancy, and is removed from the suction port of the ambient air conditioning.
In Case 1, a heat rising flow of the human body is formed right above the human body, and in Case 2 and Case 3, a heat rising flow is formed in the rearward direction of the head on the leeward side due to the blowing wind speed of the personal air conditioning.
[0043]
Further, in the case 3, as compared with the other cases (cases 1 and 2), the temperature rising portion of the ascending flow around the human body is thinner due to the effect of the high airflow from the personal air conditioning unit T. In all cases, the environment is uniform with the vertical temperature difference and the temperature distribution in the room being about 1.0 ° C. or less.
In addition, the return temperature from the inlet of the ambient air conditioning is almost equal to about 26.3 ° C. because the heat load is equal in each case and heat is removed only at the ambient air conditioning inlet.
[0044]
3) Intake area (SVE5)
As shown in FIG. 12, the intake area (SVE5) indicates an area of 0.1 or more.
In Case 1 with only ambient air conditioning, the inhalation area is widely distributed from the nostrils to a place near the desk.
In the case of Case 3 which is affected by high wind speed blowing, the intake area (SVE5) is distributed only around the nose and mouth which are considerably narrower than in Case 1.
[0045]
4) Age of air (SVE3)
As shown in FIG. 13, the air age is expressed as dimensionless by the reciprocal of the number of ventilations (nominal ventilation time).
The air age in the intake region is about 0.75 in Case 1, 0.43 in Case 2, and 0.86 in Case 3.
When this is expressed in time, they are 0.19, 0.06, and 0.12 h (hour), respectively.
That is, when the personal air-conditioning unit T is used, the human body sucks relatively young air when compared to the case where only the ambient air-conditioning is performed.
In the personal air-conditioning unit T of the same air volume, Case 2 of low wind speed blowout has less mixing with the surrounding air, and the arrival time of the clean air in the intake area is about half that of Case 3 of high wind speed blowout. I have.
[0046]
5) Life expectancy (SVE6)
As shown in FIG. 14, the life expectancy of the air is expressed in a dimensionless manner together with the age of the air by the reciprocal (nominal ventilation time) of the ventilation frequency.
The life expectancy distribution around the nose almost corresponds to the calculation result of the inspiratory region.
In each case, the remaining life of the air around the intake area is 0.5 for Case1, 0.64 for Case2, and 0.79 for Case3.
When this is expressed in time, they are 0.13, 0.09, and 0.11 h (hour), respectively.
Case 2 has the shortest air stay time (air age + remaining air life) around the intake area.
That is, the personal air-conditioning (Caae2) that blows out at a low wind speed with little mixing with the surrounding air easily sucks the clean air for the human body, and the exhalation air is quickly discharged.
[0047]
6) Contamination contribution rate CRP1
As shown in FIG. 15 and FIG. 16, the contamination contribution ratio CRP1 is examined with respect to the generation of contaminants from eight positions, and the results are shown in Table 3 of FIG.
The values of CRP1 in Case2 and Case3 in which the personal air-conditioning unit T is adopted are considerably lower than those in Case1 in which only the ambient air-conditioning is used.
[0048]
Then, for the generation of pollutants from the desk and the partition, Case 2 and Case 3 show almost the same CRP1.
However, for the generation of pollutants from the peripheral wall surface in the room, CRP1 in which the mixing of the personal air conditioning and the surrounding air is small is about half of that in Case3.
That is, it is considered that personal air-conditioning with a low wind velocity can easily improve and secure the quality of the respiratory air of the human body by supplying a large amount of clean air to the intake area of the human body even when VOC is generated from a wall or the like.
[0049]
As a result of the above analysis,
a) In the case of high wind speed blowing (Case 3), the blowing air mixes with the surrounding air.
b) The personal air-conditioning (Case 2) with low wind speed blowout has less mixing with the surrounding air, and the air age and the remaining life of the air are smaller than those of the other cases, indicating good ventilation characteristics.
Also, the contribution of contaminants generated from furniture and peripheral wall surfaces to the intake air for indoor pollution is small.
Therefore, the personal air-conditioning unit of the present invention, by comparing Case2 and Case3, the air volume and the wind speed are almost uniform in the plane of the outlet, and the air is supplied at a low wind speed, so that the clean air supply target can be obtained. It can be seen that it is possible to blow the purified air without mixing with the surrounding air.
[0050]
【The invention's effect】
According to the present invention, the wind blown from the outlet is designed so that the air volume and the wind speed have a substantially uniform distribution in the plane of the outlet, and the air flow blown out from the air outlet is supplied at a low wind speed. Therefore, mixing with surrounding air can be greatly reduced, and local cleaning or local air conditioning can be performed effectively and comfortably.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a configuration example of a personal air conditioning unit according to a first embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration example of a personal air conditioning unit according to a second embodiment of the present invention.
FIG. 3 is a conceptual diagram illustrating a configuration of a wind regulating unit 13 in FIG.
FIG. 4 is a conceptual diagram illustrating a configuration of a wind regulating unit 13 in FIG.
FIG. 5 is a conceptual diagram illustrating a configuration of a wind regulating unit 13 in FIG.
FIG. 6 is a conceptual diagram illustrating a configuration of a wind regulating unit 13 in FIG.
FIG. 7 is a conceptual diagram showing an analysis target space analyzed by simulation.
FIG. 8 is a table 1 in which Case indicating analysis by simulation is shown.
FIG. 9 is a table 2 showing boundary conditions in each case when analyzing by simulation.
FIG. 10 is an in-plane distribution diagram showing a scalar wind speed distribution as a simulation result.
FIG. 11 is an in-plane distribution diagram showing a temperature distribution of a simulation result.
FIG. 12 is an in-plane distribution diagram showing a state of an intake region as a result of simulation.
FIG. 13 is an in-plane distribution diagram showing the state of air age as a result of simulation.
FIG. 14 is an in-plane distribution diagram showing a state of remaining life of air as a result of simulation.
FIG. 15 is a conceptual diagram showing a generation position of a pollutant.
FIG. 16 is a table 3 showing a contamination contribution rate for each generation position of a contaminant.
[Explanation of symbols]
1,2,11,12 cover
3 Cross flow fan
4,6,14,16 Filter
5 Vane
13 Wind control section

Claims (3)

An air intake that takes in air,
A blower that takes in the air, blows the air from the air outlet, and generates and blows a wind having a uniform air volume and speed in the plane of the air outlet,
A personal air conditioning unit, comprising: a filter interposed between the air intake and the blower for purifying the air. The area of the air outlet is (Vx / V0) = K (D0 / X)
X: Distance from the outlet [m]
Vx: Maximum wind speed at distance X [m / s]
V0: Wind velocity at outlet [m / s]
D0: Effective diameter of outlet [m]
K: outlet constant nozzle (circular, square) ≒ 5.0
Rectangular nozzle (aspect ratio <40) $ 4.3
Grill, register $ 4.1
The personal air-conditioning unit according to claim 1, wherein the personal air-conditioning unit is designed by the following equation. The personal air-conditioning unit according to claim 1 or 2, wherein the blower blows a low-speed wind having no swirling flow.

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