JP2022147886A - Duct type air conditioning system - Google Patents

Abstract

To provide a duct type air conditioning system capable of securing a ventilation volume in a living room unit.SOLUTION: A duct type air conditioning system includes: a branch chamber 1; a carrying fan 2 blowing air to the branch chamber 1; branch ducts 4a, 4b, 4c carrying out the air flown into the branch chamber 1 to a plurality of living rooms 3a, 3b, 3c; air volume adjustment dampers 5a, 5b, 5c adjusting an air volume to be carried out to each of the plurality of living rooms 3a, 3b, 3c via the branch ducts 4; and a control part 7 adjusting apertures of the air volume adjustment dampers 5a, 5b, 5c. The control part 7 can input the capacity of the living rooms 3a, 3b, 3c and a building and ventilation frequency, and adjusts the air volume to be carried to each of the living rooms 3a, 3b, 3c by calculating the apertures of the air volume adjustment dampers 5a, 5b, 5c.SELECTED DRAWING: Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ducted air conditioning system that blows air to multiple rooms in a house.

2. Description of the Related Art Conventionally, an air conditioner for air conditioning a plurality of rooms in a house is known (Patent Document 1).

The air conditioner will be described below with reference to FIG.

As shown in FIG. 7, a house 120, which is a space to be air-conditioned, has living rooms 108a, 108b, 108c, and 108d.

The air conditioner 100 supplies a chamber box 103 arranged in an underfloor space 107 of the building, an air conditioner 102 that generates conditioned air, and the air in the chamber box 103 to each living room 108a, 108b, 108c, 108d. A ventilation means 109 is provided.

The ventilation means 109 includes a duct 104a connected to the living rooms 108a and 108b, a duct 104b connected to the living rooms 108c and 108d, a fan 106a for supplying the air of the chamber box 103 to the living rooms 108a and 108b, the living room 108c, A fan 106b for supplying air from the chamber box 103 to 108d and an air purifier 105 for removing pollen, particulate matter, dust, etc. from the air in the ducts 104a and 104b are provided.

One end of the duct 104a is connected to the chamber box, and the other end is connected to the ceilings of living rooms 108a and 108b via dampers 101a and 101b. One end of the duct 104b is connected to the chamber box, and the other end is connected to the ceilings of living rooms 108c and 108d via dampers 101c and 101d.

Each living room 108a, 108b, 108c, 108d is provided with living room temperature detecting means 110a, 110b, 110c, 110d, and the fans 106a, 106b adjust the air volume based on the value obtained by subtracting the target temperature from the temperature of each air-blowing living room. .

In addition, the minimum air volume of the fans 106a and 106b is set based on, for example, the number of ventilation times required for the house 120 per unit time, which is stipulated by law.

The dampers 101a, 101b, 101c, and 101d are for adjusting the air volume, and the greater the opening, the greater the air volume. The opening degrees of the dampers 101a, 101b, 101c, and 101d are adjusted based on the value obtained by subtracting the target temperature from the temperature of each connected living room.

Japanese Patent No. 6533459

In such a conventional air conditioner, although the necessary ventilation air volume is maintained and controlled for the entire house, the air volume decreases in the rooms where the opening of the damper is small. For this reason, a difference in the amount of ventilation was created for each room, causing stagnation in the ventilation of the building. In other words, although the ventilation rate of the building itself met the standard, there was a possibility that the ventilation rate might be insufficient depending on the room.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a duct-type air conditioning system capable of ensuring a sufficient amount of ventilation for each living room.

In order to achieve this object, the ducted air conditioning system according to the present invention includes a branching chamber, a carrier fan for blowing air into the branching chamber, and a branching duct for carrying out the air that has flowed into the branching chamber to a plurality of living rooms. , an air volume adjustment damper that adjusts the air volume carried out to each of the plurality of living rooms via the branch duct, and a control unit that adjusts the opening degree of the air volume adjustment damper, and the control unit stores the volume of each living room A storage unit, a ventilation frequency reception unit that receives an instruction for the ventilation frequency of each living room, a required air volume calculation unit that calculates the required air volume for each living room, and a branch duct wind speed calculation unit that calculates the wind speed to be blown to each branch duct. , a duct pressure loss calculator that calculates the pressure loss of each branch duct, a damper pressure loss calculator that calculates the pressure loss of each air volume adjustment damper, and a pressure loss coefficient calculator that calculates the pressure loss coefficient of each air volume adjustment damper. a damper opening acquisition unit that acquires the damper opening, a damper opening controller that outputs to the air volume adjustment damper so that the damper opening acquired by the damper opening acquisition unit, and the air volume of the carrier fan and a transfer fan control unit that determines the air flow rate and drives the transfer fan at the air flow rate, thereby achieving the intended purpose.

ADVANTAGE OF THE INVENTION According to this invention, the duct type air conditioning system which can ensure the ventilation amount for each living room unit can be provided.

1 is a schematic diagram of a ducted air conditioning system according to Embodiment 1 of the present invention; FIG. Schematic of the control part of the duct type air conditioning system which concerns on Embodiment 1 of this invention. 4 is a flowchart showing a processing procedure for outputting the opening degree of the air volume adjustment damper according to Embodiment 1 of the present invention; 4 is a table showing bending and local loss factors of the duct according to Embodiment 1 of the present invention; 4 is a table showing the relationship between the pressure loss coefficient of the air volume adjustment damper and the opening degree of the damper according to Embodiment 1 of the present invention; 4 is a flow chart showing a processing procedure for outputting driving of the carrier fan according to the first embodiment of the present invention; Sectional drawing which shows an example of the building of the conventional air conditioning unit.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for better understanding of the present invention. It should be noted that the following embodiment is an example that embodies the present invention, and does not limit the technical scope of the present invention. In addition, throughout the drawings, the same parts are denoted by the same reference numerals, and the second and subsequent explanations are omitted or simplified.

(Embodiment 1)
First, a ducted air conditioning system 30 according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing the configuration of a ducted air conditioning system according to Embodiment 1 of the present invention.

A ducted air conditioning system 30 is installed in a building 40, which is an example of a building.

The building 40 includes a plurality of living rooms 3a, 3b, 3c each having a different size (volume) and an attic space 6. - 特許庁

The ducted air conditioning system 30 also includes a carrier fan 2 , a branch chamber 1 , branch ducts 4 a, 4 b, 4 c, air volume adjustment dampers 5 a, 5 b, 5 c, and a controller 7 .

The conveying fan 2 has a suction port, for example, in a corridor, and conveys the air circulated through the gaps of the doors and the louvers provided in the living rooms 3a, 3b, and 3c to the branching chamber 1. FIG.

The branching chamber 1 is installed, for example, in an attic or an attic space 6 such as an attic space, and branches the air conveyed by the conveying fan 2 into a plurality of branch ducts 4a, 4b, and 4c.

One ends of the branch ducts 4a, 4b, 4c are connected to a plurality of living rooms 3a, 3b, 3c, and guide the air conveyed through the branching chambers to the living rooms 3a, 3b, 3c.

The air volume adjusting dampers 5a, 5b, 5c are installed between the branch chamber 1 and the branch ducts 4a, 4b, 4c, and the air volume passing through the air volume adjusting dampers 5a, 5b, 5c is changed independently according to the opening of the dampers. It is possible.

The control unit 7 is provided in a control device arranged in a living room 3c such as a living room, for example. The control device is a remote controller with display and input functions. The controller 7 is communicably connected to the air volume adjustment dampers 5a, 5b, and 5c. The control unit 7 adjusts the air volume passing through the air volume adjustment dampers 5a, 5b and 5c by controlling the opening degrees of the air volume adjustment dampers 5a, 5b and 5c. Also, the controller 7 is communicably connected to the transfer fan 2 . The controller 7 determines the air volume of the carrier fan 2 and drives the carrier fan 2 with the air volume.

Next, the configuration of the control unit 7 will be described with reference to FIG.

The controller 7 is connected to the air volume adjusting dampers 5a, 5b, 5c and the carrier fan 2 so as to be controllable, as shown in FIG.

The control unit 7 includes a volume storage unit 10, a branch duct storage unit 11, a ventilation frequency reception unit 12, a required air volume calculation unit 13, a branch duct wind speed calculation unit 14, a duct pressure loss calculation unit 15, and a damper pressure A loss calculation unit 16 , a path pressure loss calculation unit 21 , a damper pressure loss coefficient calculation unit 17 , a damper opening acquisition unit 18 , a transfer fan control unit 19 , and a damper opening control unit 20 are provided.

The volume storage unit 10 stores the volume of each living room 3a, 3b, 3c input by the builder from a remote controller, for example.

The branch duct storage unit 11 stores the material, length, number of times of bending, bending radius and duct diameter of each of the branch ducts 4a, 4b and 4c, which are input by, for example, a builder from a remote controller.

The ventilation frequency reception unit 12 receives the ventilation frequency of each of the living rooms 3a, 3b, and 3c input by the user, for example, from a remote controller. Here, the ventilation frequency is a value indicating how much air is exchanged in each living room per unit time, and is a value such as 0.5 times/hour.

The required air volume calculation unit 13 uses the volumes of the living rooms 3a, 3b, and 3c stored in the volume storage unit 10 and the ventilation frequency received by the ventilation frequency reception unit 12 to calculate the air volume in the living rooms 3a, 3b, and 3c per unit time. Calculate the required air volume.

The branch duct wind speed calculation unit 14 calculates the air volume to the rooms 3a, 3b, and 3c calculated by the required air volume calculation unit 13 and the duct diameters of the branch ducts 4a, 4b, and 4c stored in the branch duct storage unit 11, The wind velocity of the air passing through the branch ducts 4a, 4b, 4c is calculated.

The duct pressure loss calculation unit 15 calculates the material, length, number of times of bending, bending radius of the branch ducts 4a, 4b, and 4c stored in the branch duct storage unit 11, and each calculated by the branch duct wind speed calculation unit 14. The pressure loss of each branch duct is calculated from the wind velocity of the air passing through the branch ducts 4a, 4b, and 4c.

The damper pressure loss calculator 16 calculates a pressure loss formula for the air volume adjustment dampers 5a, 5b, and 5c based on the wind velocity passing through the air volume adjustment dampers 5a, 5b, and 5c and the pressure loss coefficients of the air volume adjustment dampers 5a, 5b, and 5c. Calculate

The route pressure loss calculator 21 calculates the pressure loss of the routes connecting the branch chamber 1 and each living room 3a, 3b, 3c, that is, the total pressure loss applied to the branch ducts 4a, 4b, 4c and the air volume adjustment dampers 5a, 5b, 5c. Calculate

The damper pressure loss coefficient calculation unit 17 calculates the pressure loss coefficients of the air volume adjustment dampers 5a, 5b, and 5c so that the pressure loss of each route calculated by the route pressure loss calculation unit 21 has the same value. .

The damper opening degree acquisition unit 18 acquires the damper opening degree from the pressure loss coefficient calculated by the damper pressure loss coefficient calculation unit 17 and the "relationship between the pressure loss coefficient of the air volume adjustment damper and the damper opening degree" described later.

The damper opening degree control unit 20 outputs to the air volume adjustment dampers 5a, 5b, and 5c so that the damper opening degree obtained by the damper opening degree obtaining unit 18 is obtained.

Further, the conveying fan control unit 19 controls the output of the conveying fan 2 so that the total air volume to the living rooms 3a, 3b, and 3c calculated by the required air volume calculating unit 13 is obtained.

Next, a method of calculating the opening degrees of the air volume adjustment dampers 5a, 5b, 5c by the control unit 7 will be described with reference to FIGS.

For example, the builder inputs the volumes Ua, Ub, and Uc of the living rooms 3a, 3b, and 3c into the volume storage unit 10 in advance. Further, for example, the builder may store the duct material, the duct straight pipe portion lengths la, lb, and lc, the number of duct bending times Ta, Tb, and Tc, and the duct bending radii Ra, Rb, and Rc in advance in the branch duct storage unit 11. , duct diameters da, db, and dc.

Based on the previously input values, the controller 7 calculates the duct frictional resistance coefficients λa, λb, and λc depending on the duct material. In addition, the control unit 7 controls the duct areas Aa, Calculate Ab and Ac. Further, the control unit 7 acquires the local loss coefficients ζda, ζdb, and ζdc from the “table showing duct bends and local loss coefficients” shown in FIG. These duct frictional resistance coefficients λa, λb, λc, duct areas Aa, Ab, Ac, local loss coefficients ζda, ζdb, and ζdc may be calculated each time required in step S shown below, or may be calculated in advance. may be stored in a predetermined storage unit.

When the ventilation process is performed, calculation of the damper opening shown in FIG. 3 and calculation of the air volume to be blown by the carrier fan shown in FIG. 6 are performed in the following procedure. In addition, the symbol S means a step.

First, as shown in FIG. 3, in S201, the user inputs the ventilation frequencies Na, Nb, and Nc for each of the living rooms 3a, 3b, and 3c into the ventilation frequency receiving unit 12. FIG. The input of the ventilation frequency may be input each time the operation of the ducted air conditioning system 30 is started, or may be omitted once it is set. Also, changes during operation are possible. Note that the ventilation frequency can be set within a range that satisfies, for example, the required ventilation frequency for the house 120 per unit time, which is stipulated by law.

In S202, the required air volume calculation unit 13 calculates the required air volumes Qa, Qb, and Qc for each living room 3a, 3b, and 3c using equations (1), (2), and (3).

Qa=Ua×Na Formula (1)
Qb=Ub×Nb Formula (2)
Qc=Uc×Nc Formula (3)
This makes it possible to calculate the volume of air blown to each room.

In S203, the branch duct wind speed calculator 14 calculates the wind speeds Va, Vb, and Vc of the air passing through each of the branch ducts 4a, 4b, and 4c using equations (4), (5), and (6).

Va=Qa/Aa Formula (4)
Vb=Qb/Ab Formula (5)
Vc=Qc/Ac Formula (6)
In S204, the duct pressure loss calculator 15 calculates pressure losses Ra, Rb, and Rc applied to the respective branch ducts 4a, 4b, and 4c using equations (7), (8), and (9). Note that ρ indicates the density of air.

Rda=λa×(la/da)×ρ×(Vâ2)/2+Ta×ζda×ρ×(Vâ2)/2 Equation (7)
Rdb=λb×(lb/db)×ρ×(Vb̂2)/2+Tb×ζdb×ρ×(Vb̂2)/2 Equation (8)
Rdc=λc×(lc/dc)×ρ×(Vĉ2)/2+Tc×ζdc×ρ×(Vĉ2)/2 Equation (9)
In S205, the damper pressure loss calculator 16 calculates the pressure losses ra, rb, and rc applied to each air volume adjustment damper using equations (10), (11), and (12). Note that .zeta.a, .zeta.b, and .zeta.c indicate pressure loss coefficients of the respective air volume adjustment dampers 5a, 5b, and 5c.

ra=(ζa−1)×ρ×(Vâ2)/2 Equation (10)
rb=(ζb−1)×ρ×(Vb̂2)/2 Equation (11)
rc=(ζc−1)×ρ×(Vĉ2)/2 Equation (12)
In S206, the path pressure loss calculator 21 calculates the pressure losses Ra, Rb, and Rc of each path that communicates the branch chamber 1 with the living rooms 3a, 3b, and 3c using equations (13), (14), and (15). Calculated by

Ra=Rda+ra Formula (13)
Rb=Rdb+rb Formula (14)
Rc=Rdc+rc Formula (15)
Here, the pressure losses Ra, Rb, and Rc of each path are equal in the static pressures of the living rooms 3a, 3b, and 3c connected to one end, and the branch chambers 1 connected to the other end are the same. It becomes the relationship of Formula (16).

Ra=Rb=Rc Formula (16)
In S207, the damper pressure loss coefficient calculator 17 calculates the pressure loss coefficients ζa, ζb, ζc Calculate Further, the upper and lower limits of the pressure losses .zeta.a, .zeta.b and .zeta.c of the air volume regulating dampers 5a, 5b and 5c are determined depending on the type of air volume regulating dampers used. At this time, a plurality of combinations are calculated for the values of the pressure loss coefficients .zeta.a, .zeta.b, and .zeta.c of the air volume adjusting dampers 5a, 5b, and 5c.

In S208, the damper pressure loss coefficient calculator 17 advances to the next step when each value of the pressure loss coefficients ?a, ?b, and ?c is the smallest combination value. Thereby, it is possible to select a combination of damper openings that causes the least pressure loss on each air volume adjustment damper.

In S209, the damper opening acquisition unit 18 determines the respective air volume adjustment dampers 5a, 5b, Damper opening degrees θa, θb, and θc of 5c are obtained. Although the relationship between the damper pressure loss coefficient and the opening degree of the damper differs depending on the type of air volume adjustment damper, in the first embodiment, the relationship between the pressure loss coefficient of the air volume adjustment damper and the opening degree of the damper shown in FIG. Table” relationship.

The “table showing the relationship between the pressure loss coefficient of the air volume adjustment damper and the opening of the damper” is stored in the damper opening acquiring unit 18 . As shown in Fig. 5, when the value of the pressure loss coefficient is input, the "table showing the relationship between the pressure loss coefficient of the air volume adjustment damper and the opening degree of the damper" is displayed. can be obtained as the damper opening.

In S210, the damper opening controller 20 controls the air volume adjustment dampers 5a, 5b, and 5c so that the opening of each air volume adjustment damper is equal to the damper openings θa, θb, and θc acquired by the damper opening acquisition unit. Output to

As a result, the air volume adjusting dampers 5a, 5b, 5c for releasing the set air volume are ready for each living room.

Next, a method of calculating the output of the conveying fan 2 by the control section 7 will be described with reference to FIG.

In S221, the carrier fan control unit 19 calculates the air volume Q of the air carried by the carrier fan 2 using the equation (17). At this time, the necessary air volumes Qa, Qb, Qc of the living rooms 3a, 3b, 3c calculated in S202 based on the ventilation frequencies Na, Nb, Nc received in S201 are used.

Q=Qa+Qb+Qc Formula (17)
In S222, the carrier fan control unit 19 outputs a command to the carrier fan 2 so that the carrier fan 2 is driven at the air volume Q calculated by the equation (17).

By outputting air volume adjustment dampers 5a, 5b, 5c from the control unit 7 and output to the carrier fan 2, an air volume corresponding to the number of ventilation times input to the living rooms 3a, 3b, 3c can be blown to each room. In other words, it is possible to secure not only the ventilation volume of the building itself, but also the ventilation volume set for each room.

(Embodiment 2)
A second embodiment will be described. In addition, in Embodiment 2, only points different from Embodiment 1 will be described.

The volume storage unit 10 allows the input of the volume of the entire building.

In addition, the ventilation frequency reception unit 12 can receive the ventilation frequency of the entire building.

In the present embodiment, the required air volume calculation unit 13 calculates Equation (18) of the required air volume Qall of the entire building from the volume Uall of the entire building and the ventilation frequency Nall of the entire building.

Qall=Uall×Nall Equation (18)
In this case, the damper opening degree control unit 20 controls the air volume adjustment dampers 5a, 5b so that the air volume to be discharged to each living room 3a, 3b, 3c is blown at an air volume ratio equivalent to the volumetric ratio of the living rooms 3a, 3b, 3c. , 5c.

In other words, the air volumes Qa', Qb', Qc' discharged to the living rooms 3a, 3b, 3c are given by equations (19), (20), and (21).

Qa′=Qall×(Ua×(Ua+Ub+Uc)) Equation (19)
Qb′=Qall×(Ub×(Ua+Ub+Uc)) Equation (20)
Qc′=Qall×(Uc×(Ua+Ub+Uc)) Equation (21)
The damper opening degree acquisition unit 18 acquires the damper opening degrees θa, θb, and θc of the air volume adjustment dampers 5a, 5b, and 5c in the same manner as described in the first embodiment.

The damper opening controller 20 outputs the damper openings θa, θb, and θc acquired by the damper opening acquiring unit to the air volume adjusting dampers 5a, 5b, and 5c, respectively. .

The carrier fan controller controls the output to the carrier fan 2 so that the carrier fan 2 is driven at the air volume Qall calculated by Equation (18).

This makes it possible to ventilate each room according to the ventilation frequency set for the entire building.

(Embodiment 3)
A third embodiment will be described. In the third embodiment, only points different from the first embodiment will be described.

Further, the ventilation frequency reception unit 12 may simultaneously receive the ventilation frequency of the entire building and the ventilation frequency of the living rooms 3a, 3b, and 3c.

The required air volume calculation unit 13 calculates the required air volume A for the entire building from the number of ventilation times for the entire building and the volume of the entire building. (Formula (18))
At this time, the air volume conveyed by the conveying fan is A.

Similarly, the required air volume calculation unit 13 calculates the required air volumes Qa, Qb, and Qc for the living rooms 3a, 3b, and 3c from the ventilation times of the living rooms 3a, 3b, and 3c and the volumes of the living rooms 3a, 3b, and 3c.

At this time, the volume B of the air conveyed by the conveying fan 2 is given by equation (22).

B=Qa+Qb+Qc Formula (22)
The transfer fan control unit 19 compares the air volume A and the air volume B, and selects the setting of the large air volume.

The carrier fan control unit 19 controls the output to the carrier fan 2 so that it is driven at the selected air volume.

As a result, when the number of times of ventilation is set simultaneously for the entire building and for each living room, it is possible to ventilate the entire building with the larger air volume conveyed by the carrier fan 2, that is, with the setting of the larger ventilation volume. can.

(Embodiment 4)
A fourth embodiment will be described. In addition, in Embodiment 4, only points different from Embodiment 1 will be described.

In Embodiment 1, the cross-sectional areas of the air volume adjustment dampers in the direction perpendicular to the flow of air passing through the air volume adjustment dampers 5a, 5b, and 5c were calculated as being equivalent to the duct areas Aa, Ab, and Ac. They may be different, as shown in this embodiment.

In that case, the control unit includes a damper storage unit and a damper wind speed calculation unit (not shown). Then, the damper wind speed calculator calculates the wind speed of the air passing through the air volume adjustment dampers 5a, 5b, and 5c. The procedure is shown below.

The user inputs damper diameters dda, ddb, and ddc in the damper storage unit. The control unit 7 calculates cross-sectional areas Ada, Adb, and Adc of the dampers from the damper diameters dda, ddb, and ddc. The damper wind speed calculator calculates the wind speeds Vda, Vdb, and Vdc of the air passing through the air volume adjustment dampers 5a, 5b, and 5c using equations (23), (24), and (25).

Vda=Qa/Ada Formula (23)
Vdb=Qa/Adb Equation (24)
Vdc=Qa/Adc Equation (25)
The procedure for calculating the wind speed of the air passing through the air volume adjusting dampers 5a, 5b, and 5c by the damper wind speed calculator has been described above.

At this time, the damper pressure loss calculator 16 calculates the pressure losses rda, rdb, and rdc applied to each air volume adjustment damper by equations (26), (27), and (28) rda=(ζa−1)×ρ ×(Vda^2)/2 Equation (26)
rdb=(ζb−1)×ρ×(Vdb̂2)/2 Equation (27)
rdc=(ζc−1)×ρ×(Vdĉ2)/2 Equation (28)
After that, the pressure losses rda, rdb, and rdc applied to each air volume adjustment damper are obtained by the pressure losses ra, rb, and rc are substituted respectively.

As a result, even if the diameter of the branch duct and the diameter of the damper are different, the air volume corresponding to the ventilation frequency input to the rooms 3a, 3b, and 3c can be blown to each room.

(Modification 1)
In Embodiments 1, 2, and 3, the number of living rooms is three, but at least one or more is sufficient.

Also, although one branch duct is provided for each living room, it is sufficient that each living room is provided with at least one or more branch ducts.

Further, the ventilation frequency reception unit 12 may be capable of receiving a ventilation frequency of zero. If the ventilation frequency is set to 0, set the ventilation frequency to 0 or more in at least one or more living rooms. As a result, unnecessary power consumption can be reduced by setting the ventilation frequency to 0 for a room that does not require ventilation, for example, a room that no one enters.

The duct-type air-conditioning system according to the present invention is effective as an air-conditioning system that enables ventilation without stagnation of the air in the building because the number of times of ventilation can be set for each living room.

1 branch chamber 2 transfer fan 3a living room 3b living room 3c living room 4a branch duct 4b branch duct 4c branch duct 5a air volume adjustment damper 5b air volume adjustment damper 5c air volume adjustment damper 6 attic space 7 control unit 10 volume storage unit 11 branch duct storage unit 12 ventilation Number of times reception unit 13 Required air volume calculation unit 14 Branch duct wind speed calculation unit 15 Duct pressure loss calculation unit 16 Damper pressure loss calculation unit 17 Damper pressure loss coefficient calculation unit 18 Damper opening acquisition unit 19 Conveying fan control unit 20 Damper opening control unit 21 path pressure loss calculator 30 ducted air conditioning system 40 building 100 air conditioner 101a damper 101b damper 101c damper 101d damper 102 air conditioner 103 chamber box 104a duct 104b duct 105 air cleaner 106a fan 106b fan 107 underfloor space 108a living room 108c living room 108d living room 109 ventilation means 110a living room temperature detecting means 110b living room temperature detecting means 110c living room temperature detecting means 110d living room temperature detecting means 120 house

Claims (5)

a carrier fan for blowing air to the branch chamber;
a plurality of branch ducts for carrying out the inflow air that has flowed into the branch chamber to a plurality of air-conditioned spaces;
an air volume adjustment damper for adjusting the volume of air conveyed to each of the air-conditioned spaces via the branch duct;
A control unit that adjusts the opening degree of the air volume adjustment damper,
The control unit includes a volume storage unit that stores the volume of each of the air-conditioned spaces;
a ventilation frequency reception unit that receives an instruction of the ventilation frequency required for the air-conditioned space;
a required air volume calculation unit that calculates a required air volume for each air-conditioned space based on the ventilation frequency and the volume of the air-conditioned space stored in the volume storage unit;
Branch duct wind speed calculation for calculating a wind speed to be blown to each branch duct based on the required air volume for each air-conditioned space calculated by the required air volume calculation unit and the duct diameter of the branch duct connected to each air-conditioned space. Department and
a duct pressure loss calculator that calculates the branch duct pressure loss determined based on the wind speed, duct length, number of times of bending, bending radius, and material of the branch duct;
The sum of the pressure loss of each branch duct calculated by the duct pressure loss calculation unit and the pressure loss of the air volume adjustment damper connected to the branch duct is the same for each route from the branch chamber to each space to be air-conditioned. a damper pressure loss calculation unit that calculates the pressure loss of each air volume adjustment damper so that
The wind speed to be blown to each branch duct calculated by the branch duct wind speed calculation unit, the pressure loss of the branch duct calculated by the duct pressure loss calculation unit, and the air volume adjustment dampers calculated by the damper pressure loss calculation unit a damper pressure loss coefficient calculation unit that calculates the pressure loss coefficient of each air volume adjustment damper based on the pressure loss of
Acquisition of damper opening for acquiring the damper opening based on the pressure loss coefficient of each air volume adjustment damper calculated by the damper pressure loss coefficient calculation unit and a pressure loss coefficient table that associates the pressure loss coefficient with the damper opening Department and
A damper opening control unit that outputs to the air volume adjustment damper so that the opening of the damper obtained by the damper opening obtaining unit is obtained;
a carrier fan control unit that determines the air volume of the carrier fan based on the sum of the required air volume for each air-conditioned space calculated by the required air volume calculation unit and drives the carrier fan at the determined air volume;
Ducted air conditioning system with. The ventilation frequency reception unit
2. The ducted air conditioning system according to claim 1, wherein an instruction of ventilation frequency can be received for each of said air conditioned spaces. The ventilation frequency reception unit
2. The ducted air conditioning system according to claim 1, wherein a setting of zero ventilation frequency for the space to be air conditioned can be accepted. The volume storage unit
storing the volume of the entire building to which each air-conditioned space belongs;
The ventilation frequency reception unit
It is possible to receive an instruction of the ventilation frequency for the entire building,
The control unit
Calculate the output of the carrier fan from the ventilation frequency of the entire building and the volume of the entire building,
Using the branch duct pressure loss calculation unit, the pressure loss calculated by the damper pressure loss calculation unit, and the ventilation frequency of the entire building, the air volume ratio similar to the volume ratio of each air-conditioned space 2. The ducted air conditioning system according to claim 1, further comprising a function of controlling said damper opening obtaining section so that The transfer fan control unit
Calculate the air volume A conveyed by the conveying fan from the ventilation frequency required for the entire building and the volume of the entire building,
calculating an air volume B conveyed by the conveying fan from the sum of the number of times of ventilation required for each of the air-conditioned spaces and the volume of the air-conditioned spaces;
The control unit
5. The ducted air conditioning system according to claim 4, wherein the air volume A and the air volume B are compared, and priority is given to setting a larger air volume, and the output of the carrier fan and the opening degree of the air volume adjusting damper are controlled.

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