Ducted air conditioning system

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

[Technical field]

[0001] The present invention relates to a ducted air conditioning system that blows air to multiple rooms in a house. [Background technology]

[0002] 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).

[0003] The air conditioner will be described below with reference to FIG.

[0004] As shown in FIG. 7, a house 120, which is a space to be air-conditioned, includes rooms 108a, 108b, 108c, and 108d.

[0005] The air conditioning device 100 comprises a chamber box 103 arranged in an underfloor space 107 of a building, an air conditioner 102 that generates conditioned air, and a ventilation means 109 that supplies the air in the chamber box 103 to each of the rooms 108a, 108b, 108c, and 108d.

[0006] The ventilation means 109 includes a duct 104a connected to rooms 108a, 108b, a duct 104b connected to rooms 108c, 108d, a fan 106a that supplies air from the chamber box 103 to rooms 108a, 108b, a fan 106b that supplies air from the chamber box 103 to rooms 108c, 108d, and an air purifier 105 that removes pollen, particulate matter, dust, etc. from the air in ducts 104a, 104b.

[0007] One end of duct 104a is connected to the chamber box, and the other end is connected to the ceilings of rooms 108a and 108b via dampers 101a and 101b. In addition, one end of duct 104b is connected to the chamber box, and the other end is connected to the ceilings of rooms 108c and 108d via dampers 101c and 101d.

[0008] Each of the rooms 108a, 108b, 108c, and 108d is provided with a room temperature detection means 110a, 110b, 110c, and 110d, and the fans 106a, 106b adjust the air volume based on the value obtained by subtracting a target temperature from the temperature of the room to which the air is being sent.

[0009] Furthermore, the minimum airflow rate of the fans 106a and 106b is set based on the number of ventilations required for the house 120 per unit time, which is stipulated by law, for example.

[0010] The dampers 101a, 101b, 101c, and 101d are used to adjust the amount of airflow, and the greater the opening, the greater the amount of airflow. The opening of the dampers 101a, 101b, 101c, and 101d is adjusted based on the temperature of each connected room minus the target temperature. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Patent No. 6533459 Summary of the Invention [Problem to be solved by the invention]

[0012] In such conventional air conditioning systems, the required ventilation air volume is maintained and controlled for the entire house, but the air volume is reduced for rooms where the damper opening is small. This results in differences in ventilation volume for each room, causing stagnation in the building's ventilation. In other words, while the standard is met for the ventilation volume of the building itself, there is a possibility that the ventilation volume may be insufficient for some rooms.

[0013] Therefore, the present invention is devised to solve the above-mentioned problems, and has an object to provide a ducted air conditioning system that can ensure ventilation volume for each room. [Means for solving the problem]

[0014] In order to achieve this object, the ducted air-conditioning system of the present invention includes a branch chamber, a transport fan for blowing air into the branch chamber, a branch duct for discharging the air that has flowed into the branch chamber to a plurality of rooms, an air volume control damper for adjusting the volume of air discharged through the branch duct to each of the plurality of rooms, and a control unit for adjusting the opening degree of the air volume control damper, and the control unit includes a volume storage unit for storing the volume of each room, a ventilation frequency reception unit for receiving an instruction for the ventilation frequency of each room, a required air volume calculation unit for calculating the required air volume for each room, and a wind speed control unit for calculating the wind speed to be blown to each branch duct. the airflow control unit includes a branch duct air velocity calculation unit that calculates the pressure loss of each branch duct, a duct pressure loss calculation unit that calculates the pressure loss of each branch duct, a damper pressure loss calculation unit that calculates the pressure loss of each airflow adjustment damper, a pressure loss coefficient calculation unit that calculates the pressure loss coefficient of each airflow adjustment damper, a damper opening acquisition unit that acquires the damper opening, a damper opening control unit that outputs to the airflow adjustment damper so as to achieve the damper opening acquired by the damper opening acquisition unit, and a transport fan control unit that determines the airflow of the transport fan and drives it at that airflow, thereby achieving the desired objective. Effect of the Invention

[0015] According to the present invention, it is possible to provide a ducted air conditioning system capable of ensuring a ventilation volume for each room. [Brief description of the drawings]

[0016] [Figure 1] 1 is a schematic diagram of a ducted air conditioning system according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of a control unit of the ducted air conditioning system according to the first embodiment of the present invention. [Diagram 3] 5 is a flowchart showing a processing procedure for outputting the opening degree of an air volume control damper according to the first embodiment of the present invention. [Figure 4] 4 is a table showing bends and local loss coefficients of a duct according to the first embodiment of the present invention. [Diagram 5] 4 is a table showing the relationship between the pressure loss coefficient and the damper opening degree of the air flow control damper according to the first embodiment of the present invention. [Figure 6] 5 is a flowchart showing a processing procedure for outputting drive of the transport fan according to the first embodiment of the present invention. [Figure 7] FIG. 1 is a cross-sectional view showing an example of a building having a conventional air conditioning unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention. Note that the following embodiment is an example of the present invention and does not limit the technical scope of the present invention. In addition, the same reference numerals are used to designate the same parts throughout the drawings, and the description thereof will be omitted or simplified from the second time onwards.

[0018] (Embodiment 1) First, a ducted air conditioning system 30 according to the present invention will be described with reference to Fig. 1. Fig. 1 is a diagram showing the configuration of a ducted air conditioning system according to a first embodiment of the present invention.

[0019] The ducted air conditioning system 30 is installed in a building 40, which is an example of a building.

[0020] The building 40 comprises a plurality of rooms 3a, 3b, 3c each having a different size (volume), and an attic space 6.

[0021] The ducted air conditioning system 30 also includes a transfer fan 2, a branch chamber 1, branch ducts 4a, 4b, and 4c, air volume adjustment dampers 5a, 5b, and 5c, and a control unit .

[0022] The transport fan 2 has an intake port, for example, in a corridor, and transports air circulating through louvers or gaps in doors provided in the rooms 3a, 3b, and 3c to the branch chamber 1.

[0023] The branch chamber 1 is installed in an attic space 6 such as an attic or a space under an shed, and branches the air delivered by the delivery fan 2 into a plurality of branch ducts 4a, 4b, and 4c.

[0024] The branch ducts 4a, 4b, 4c have one end connected to the plurality of rooms 3a, 3b, 3c, and guide the air conveyed through the branch chamber to the rooms 3a, 3b, 3c.

[0025] The air volume adjustment dampers 5a, 5b, and 5c are installed between the branch chamber 1 and the branch ducts 4a, 4b, and 4c, and the amount of air passing through the air volume adjustment dampers 5a, 5b, and 5c can be changed independently by changing the opening degree of the dampers.

[0026] The control unit 7 is provided in a control device arranged in a living room 3c, for example. The control device is a remote controller equipped with display and input functions. The control unit 7 is communicatively connected to the air volume adjustment dampers 5a, 5b, 5c. The control unit 7 adjusts the volume of air passing through the air volume adjustment dampers 5a, 5b, 5c by controlling the opening degree of the air volume adjustment dampers 5a, 5b, 5c. The control unit 7 is also communicatively connected to the transport fan 2. The control unit 7 determines the air volume of the transport fan 2 and drives the transport fan 2 at that air volume.

[0027] Next, the configuration of the control unit 7 will be described with reference to FIG.

[0028] The control unit 7 is controllably connected to the air volume adjustment dampers 5a, 5b, and 5c and the transport fan 2, as shown in FIG.

[0029] The control unit 7 includes a volume memory unit 10, a branch duct memory unit 11, a ventilation rate receiving unit 12, a required air volume calculation unit 13, a branch duct wind speed calculation unit 14, a duct pressure loss calculation unit 15, a damper pressure 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 conveying fan control unit 19, and a damper opening control unit 20.

[0030] The volume storage unit 10 stores the volumes of the rooms 3a, 3b, and 3c input by the builder via a remote controller, for example.

[0031] The branch duct storage unit 11 stores the material, length, number of bends, bend radius, and duct diameter of each of the branch ducts 4a, 4b, and 4c, which are input by an installer via a remote controller, for example.

[0032] The ventilation frequency reception unit 12 receives the ventilation frequency of each of the rooms 3a, 3b, and 3c input by the user via a remote controller, for example. The ventilation frequency here is a value indicating how much air is exchanged in each room per unit time, and is, for example, 0.5 times / hour.

[0033] The required air volume calculation unit 13 calculates the air volume required for the rooms 3a, 3b, 3c per unit time from the volumes of the rooms 3a, 3b, 3c stored in the volume memory unit 10 and the ventilation rate received by the ventilation rate reception unit 12.

[0034] The branch duct wind speed calculation unit 14 calculates the wind speed of the air passing through the branch ducts 4a, 4b, 4c from the air volume to the rooms 3a, 3b, 3c calculated by the required air volume calculation unit 13 and the duct diameters of the branch ducts 4a, 4b, 4c stored in the branch duct memory unit 11.

[0035] The duct pressure loss calculation unit 15 calculates the pressure loss of each branch duct from the material, length, number of bends, and bending radius of the branch ducts 4a, 4b, and 4c stored in the branch duct memory unit 11, and the wind speed of the air passing through each branch duct 4a, 4b, and 4c calculated by the branch duct wind speed calculation unit 14.

[0036] The damper pressure loss calculation unit 16 calculates an equation for the pressure loss applied to the airflow control dampers 5a, 5b, 5c from the air speed passing through the airflow control dampers 5a, 5b, 5c and the pressure loss coefficient of the airflow control dampers 5a, 5b, 5c.

[0037] The path pressure loss calculation unit 21 calculates the pressure loss of the paths connecting the branch chamber 1 with each of the rooms 3a, 3b, 3c, that is, the sum of the pressure losses in the branch ducts 4a, 4b, 4c and the air volume control dampers 5a, 5b, 5c.

[0038] The damper pressure loss coefficient calculation unit 17 calculates the pressure loss coefficient of each of the air volume adjustment dampers 5a, 5b, 5c so that the pressure losses of the paths calculated by the path pressure loss calculation unit 21 are the same value for each path.

[0039] 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 below.

[0040] The damper opening control unit 20 outputs to the air volume adjustment dampers 5a, 5b, and 5c so that the damper opening is set to the opening acquired by the damper opening acquisition unit 18.

[0041] Further, the transport fan control unit 19 controls the output of the transport fan 2 so that the total air volume calculated by the required air volume calculation unit 13 for the rooms 3a, 3b, and 3c becomes equal to the required air volume.

[0042] Next, a method for calculating the opening degrees of the air volume adjustment dampers 5a, 5b, and 5c by the control unit 7 will be described with reference to FIGS.

[0043] For example, the builder inputs in advance the volumes Ua, Ub, and Uc of the rooms 3a, 3b, and 3c into the volume storage unit 10. In addition, for example, the builder inputs in advance the duct material, the duct straight portion lengths la, lb, and lc, the duct bend numbers Ta, Tb, and Tc, the duct bend radii Ra, Rb, and Rc, and the duct diameters da, db, and dc into the branch duct storage unit 11.

[0044] Using the above-mentioned previously input values, the control unit 7 calculates the duct friction coefficients λa, λb, and λc according to the duct material. The control unit 7 also calculates the duct areas Aa, Ab, and Ac in a direction perpendicular to the air flow passing through the branch ducts 4a, 4b, and 4c, using the duct diameters da, db, and dc and the bending radii Ra, Rb, and Rc. The control unit 7 also acquires the local loss coefficients ζda, ζdb, and ζdc from the "table showing duct bending and local loss coefficient" shown in FIG. 4, which is stored in the branch duct storage unit 11. These duct friction coefficients λa, λb, and λc, duct areas Aa, Ab, and Ac, and local loss coefficients ζda, ζdb, and ζdc may be calculated each time they are requested in step S described below, or may be calculated in advance and stored in a predetermined storage unit.

[0045] When the ventilation process is performed, the damper opening degree shown in Fig. 3 and the air volume to be blown by the transport fan shown in Fig. 6 are calculated in the following procedure. Note that the symbol S means a step.

[0046] First, as shown in Fig. 3, in S201, the user inputs the ventilation rates Na, Nb, and Nc for each of the rooms 3a, 3b, and 3c to the ventilation rate receiving unit 12. The input of the ventilation rates may be input each time the ducted air conditioning system 30 starts operating, or can be omitted once it is set. It can also be changed during operation. The ventilation rate can be set within a range that satisfies the ventilation rate required for the house 120 per unit time, for example, as specified by law.

[0047] In S202, the required airflow calculation unit 13 calculates the required airflows Qa, Qb, and Qc for each of the rooms 3a, 3b, and 3c using equations (1), (2), and (3).

[0048] Qa = Ua × Na Equation (1) Qb=Ub×Nb Equation (2) Qc = Uc × Nc Equation (3) This makes it possible to calculate the volume of air sent to each room.

[0049] In S203, the branch duct air velocity calculation unit 14 calculates the air velocity Va, Vb, Vc of the air passing through each of the branch ducts 4a, 4b, 4c by the formulas (4), (5), (6).

[0050] Va=Qa / Aa Equation (4) Vb=Qb / Ab formula (5) Vc=Qc / Ac Equation (6) In S204, the duct pressure loss calculation unit 15 calculates the pressure losses Ra, Rb, and Rc acting on the branch ducts 4a, 4b, and 4c, respectively, using the formulas (7), (8), and (9), where ρ represents the density of air.

[0051] Rda=λa×(la / da)×ρ×(Va^2) / 2+Ta×ζda×ρ×(Va^2) / 2 Equation (7) Rdb=λb×(lb / db)×ρ×(Vb^2) / 2+Tb×ζdb×ρ×(Vb^2) / 2 Equation (8) Rdc=λc×(lc / dc)×ρ×(Vc^2) / 2+Tc×ζdc×ρ×(Vc^2) / 2 Equation (9) In S205, the damper pressure loss calculation unit 16 calculates the pressure losses ra, rb, and rc acting on each airflow control damper using equations (10), (11), and (12), where ζa, ζb, and ζc are the pressure loss coefficients of the airflow control dampers 5a, 5b, and 5c, respectively.

[0052] ra=(ζa―1)×ρ×(Va^2) / 2 Equation (10) rb=(ζb−1)×ρ×(Vb^2) / 2 Equation (11) rc=(ζc−1)×ρ×(Vc^2) / 2 Equation (12) In S206, the path pressure loss calculation unit 21 calculates the pressure losses Ra, Rb, and Rc of the paths connecting the branch chamber 1 with the rooms 3a, 3b, and 3c, respectively, using the formulas (13), (14), and (15).

[0053] Ra = Rda + ra Equation (13) Rb=Rdb+rb Equation (14) Rc=Rdc+rc Equation (15) Here, the pressure losses Ra, Rb, and Rc of each path are related by equation (16) because the static pressures of the rooms 3a, 3b, and 3c connected to one end are equal and the branch chambers 1 connected to the other end are the same.

[0054] Ra = Rb = Rc Equation (16) In S207, the damper pressure loss coefficient calculation unit 17 calculates the pressure loss coefficients ζa, ζb, and ζc of each of the airflow control dampers 5a, 5b, and 5c from the relationships in the formulas (13), (14), (15), and (16). Furthermore, the upper and lower limits of the values ​​of the pressure losses ζa, ζb, and ζc of the airflow control dampers 5a, 5b, and 5c are determined depending on the type of airflow control damper used. At this time, multiple combinations of the values ​​of the pressure loss coefficients ζa, ζb, and ζc of the airflow control dampers 5a, 5b, and 5c are calculated.

[0055] In S208, if the pressure loss coefficients ζa, ζb, and ζc are the smallest combination, the damper pressure loss coefficient calculation unit 17 proceeds to the next step. This makes it possible to select a combination of damper openings that provides the smallest pressure loss to each air volume control damper.

[0056] In S209, the damper opening acquisition unit 18 acquires the damper openings θa, θb, θc of the selected air volume control dampers 5a, 5b, 5c based on the relationship between the pressure loss coefficients ζa, ζb, ζc of the selected air volume control dampers 5a, 5b, 5c and the damper openings. Note that the relationship between the damper pressure loss coefficient and the damper openings differs depending on the type of air volume control damper, but in the present embodiment 1, the relationship is that shown in the "table showing the relationship between the pressure loss coefficient and the damper opening of the air volume control dampers" in FIG.

[0057] The "table showing the relationship between the pressure loss coefficient of the airflow control damper and the damper opening" is stored in the damper opening acquisition unit 18. As shown in Fig. 5, when a pressure loss coefficient value is inputted into the "table showing the relationship between the pressure loss coefficient of the airflow control damper and the damper opening", the point where a horizontal line segment for the pressure loss coefficient value intersects with the graph can be acquired as the damper opening.

[0058] In S210, the damper opening control unit 20 outputs to the airflow control dampers 5a, 5b, and 5c so that the opening of each airflow control damper becomes the damper openings θa, θb, and θc acquired by the damper opening acquisition unit.

[0059] This prepares the air volume control dampers 5a, 5b, 5c for discharging the set air volume in each room.

[0060] Next, a method for calculating the output of the transport fan 2 by the control unit 7 will be described with reference to FIG.

[0061] In S221, the transport fan control unit 19 calculates the air volume Q of the air transported by the transport fan 2 using formula (17). At this time, the required air volumes Qa, Qb, and Qc for each of the rooms 3a, 3b, and 3c calculated in S202 based on the ventilation rates Na, Nb, and Nc received in S201 are used.

[0062] Q = Qa + Qb + Qc Equation (17) In S222, the transport fan control unit 19 outputs a command to the transport fan 2 to drive the transport fan 2 at the air volume Q calculated by the formula (17).

[0063] The air volume equivalent to the ventilation rate input to the rooms 3a, 3b, and 3c can be sent to each room by the air volume adjustment dampers 5a, 5b, and 5c by the control unit 7 and the output to the transport fan 2. In other words, it is possible to ensure not only the ventilation volume of the building itself, but also the ventilation volume set for each room.

[0064] (Embodiment 2) A description will now be given of embodiment 2. Note that in embodiment 2, only the points that are different from embodiment 1 will be described.

[0065] The volume storage unit 10 allows the volume of the entire building to be input.

[0066] Moreover, the ventilation frequency receiving unit 12 can receive the ventilation frequency of the entire building.

[0067] In this embodiment, the required air volume calculation unit 13 calculates equation (18) of the required air volume Qall for the entire building from the volume Uall of the entire building and the ventilation rate Nall of the entire building.

[0068] Qall = Uall × Nall Equation (18) In this case, the damper opening control unit 20 controls the output to the air volume adjustment dampers 5a, 5b, 5c so that the air volume released to each room 3a, 3b, 3c is blown at an air volume ratio equal to the volume ratio of the rooms 3a, 3b, 3c.

[0069] In other words, the air volumes Qa', Qb', and Qc' discharged to the respective rooms 3a, 3b, and 3c are expressed by equations (19), (20), and (21).

[0070] Qa'=Qall×(Ua×(Ua+Ub+Uc)) Equation (19) Qb'=Qall×(Ub×(Ua+Ub+Uc)) Equation (20) Qc'=Qall×(Uc×(Ua+Ub+Uc)) Equation (21) Similar to the contents described in the first embodiment, 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.

[0071] The damper opening control unit 20 outputs to the airflow control dampers 5a, 5b, and 5c so that the opening of each airflow control damper becomes the damper openings θa, θb, and θc acquired by the damper opening acquisition unit.

[0072] The transport fan control unit controls the output to the transport fan 2 so that the transport fan 2 is driven at the air volume Qall calculated by the formula (18).

[0073] This allows ventilation of each room by setting the ventilation rate for the entire building.

[0074] (Embodiment 3) A description will now be given of embodiment 3. In embodiment 3, only the points different from embodiment 1 will be described.

[0075] Furthermore, the ventilation frequency receiving unit 12 may simultaneously receive the ventilation frequency of the entire building and the ventilation frequency of the rooms 3a, 3b, and 3c.

[0076] The required air volume calculation unit 13 calculates the required air volume A for the entire building from the ventilation frequency for the entire building and the volume of the entire building (Equation (18)). At this time, the volume of air conveyed by the conveying fan is A.

[0077] Similarly, the required airflow calculation unit 13 calculates the required airflows Qa, Qb, Qc for the rooms 3a, 3b, 3c from the ventilation rates of the rooms 3a, 3b, 3c and the volumes of the rooms 3a, 3b, 3c.

[0078] At this time, the volume B of the air transported by the transport fan 2 is given by equation (22).

[0079] B = Qa + Qb + Qc Equation (22) The transport fan control unit 19 compares the air volume A with the air volume B, and selects the setting for the larger air volume.

[0080] The transport fan control unit 19 controls the output to the transport fan 2 so that the transport fan 2 is driven at the selected air volume.

[0081] As a result, when the ventilation frequency is set simultaneously for the entire building and for each room, the entire building can be ventilated with the setting that delivers the greater amount of air from the transport fan 2, i.e., the greater ventilation volume.

[0082] (Embodiment 4) A description will be given of embodiment 4. In embodiment 4, only the points different from embodiment 1 will be described.

[0083] In embodiment 1, the cross-sectional area of ​​the air flow control dampers 5a, 5b, and 5c in a direction perpendicular to the flow of air passing through them was calculated as being equal to the duct areas Aa, Ab, and Ac, but as shown in this embodiment, they may be different.

[0084] In this case, the control unit includes a damper storage unit and a damper wind speed calculation unit (not shown). The damper wind speed calculation unit calculates the wind speed of air passing through the air volume adjustment dampers 5a, 5b, and 5c. The procedure is as follows.

[0085] The user inputs the damper diameters dda, ddb, and ddc into the damper storage unit. The control unit 7 calculates the cross-sectional areas Ada, Adb, and Adc of the dampers from the damper diameters dda, ddb, and ddc. The damper air speed calculation unit calculates the air 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).

[0086] Vda=Qa / Ada Equation (23) Vdb=Qa / Adb Equation (24) Vdc=Qa / Adc Equation (25) The above is the procedure for calculating the wind speed of the air passing through the air volume adjustment dampers 5a, 5b, and 5c by the damper wind speed calculation unit.

[0087] At this time, the damper pressure loss calculation unit 16 calculates the pressure losses rda, rdb, and rdc acting on each air volume adjustment damper using equations (26), (27), and (28). rda=(ζa−1)×ρ×(Vda^2) / 2 Equation (26) rdb=(ζb−1)×ρ×(Vdb^2) / 2 Equation (27) rdc=(ζc−1)×ρ×(Vdc^2) / 2 Equation (28) Thereafter, the pressure losses rda, rdb, and rdc acting on each air flow control damper are substituted for the pressure losses ra, rb, and rc acting on each air flow control damper shown in equations (13), (14), and (15) described in embodiment 1, respectively.

[0088] As a result, even if the diameter of the branch duct and the diameter of the damper are different, it is possible to send air volume equivalent to the ventilation rate input to rooms 3a, 3b, and 3c to each room.

[0089] (Variation 1) In the first, second and third embodiments, three rooms are used as an example, but it is sufficient that there is at least one room.

[0090] Also, although one branch duct is provided for each room, it is sufficient that each room is provided with at least one branch duct.

[0091] Furthermore, the ventilation frequency receiving unit 12 may be able to receive a ventilation frequency of 0. When the ventilation frequency is set to 0, the ventilation frequency is set to 0 or more in at least one or more rooms. This makes it possible to reduce unnecessary power consumption by setting the ventilation frequency to 0 for rooms that do not require ventilation, for example, rooms where no one enters. [Industrial Applicability]

[0092] Since the ducted air conditioning system according to the present invention can set the ventilation rate for each room, it is effective as an air conditioning system that enables smooth ventilation of the air inside a building. [Explanation of symbols]

[0093] 1 Branch chamber 2 Transport fan 3a living room 3b living room 3c living room 4a Branch duct 4b Branch duct 4c Branch duct 5a Air flow control damper 5b Air flow control damper 5c Airflow control damper 6 Attic space 7 Control section 10 Volume storage 11 Branch duct memory section 12 Ventilation Frequency Reception Section 13 Required air volume calculation section 14 Branch duct wind speed calculation section 15 Duct pressure loss calculation section 16 Damper pressure loss calculation section 17 Damper pressure loss coefficient calculation section 18 Damper opening acquisition unit 19. Conveyor fan control section 20 Damper opening control section 21 Path pressure loss calculation section 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 Purifier 106a Fan 106b Fan 107 Underfloor space 108a Living room 108b Room 108c living room 108d living room 109 Ventilation 110a Room temperature detection means 110b Room temperature detection means 110c Room temperature detection means 110d Room temperature detection means 120 Housing

Claims

1. A conveying fan that blows air into the branch chamber; A plurality of branch ducts that discharge the inflow air flowing into the branch chamber to a plurality of spaces to be air-conditioned; an air volume adjustment damper for adjusting the volume of air conveyed to each of the air conditioned spaces through 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 receiving unit that receives an instruction for a 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 rate and the volume of the air conditioned space stored in the volume storage unit; a branch duct air speed calculation unit that calculates an air speed to be sent to each branch duct based on the required air volume for each of the air conditioned spaces calculated by the required air volume calculation unit and a duct diameter of the branch duct connected to each of the air conditioned spaces; and a duct pressure loss calculation unit that calculates a branch duct pressure loss determined based on the wind speed, duct length, number of bends, bend radius, and material of the branch duct; a damper pressure loss calculation unit that calculates the pressure loss of each air volume control damper so that the sum of the pressure loss of each branch duct calculated by the duct pressure loss calculation unit and the pressure loss of an air volume control damper connected to the branch duct is the same for each path from the branch chamber to each air conditioned space; a damper pressure loss coefficient calculation unit that calculates a pressure loss coefficient of each air volume adjustment damper based on the air speed to be blown to each branch duct calculated by the branch duct air speed calculation unit, the pressure loss of the branch duct calculated by the duct pressure loss calculation unit, and the pressure loss of each air volume adjustment damper calculated by the damper pressure loss calculation unit; and a damper opening degree acquisition unit that acquires a damper opening degree 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 degree; a damper opening control unit that outputs to an air volume adjustment damper so that the damper opening is the opening acquired by the damper opening acquisition unit; The transport unit is configured to calculate the required air volume based on the sum of the required air volumes for each of the spaces to be air-conditioned calculated by the required air volume calculation unit. a conveying fan control unit that determines the air volume of the blowing fan and drives the blowing fan at the determined air volume; Equipped with a ducted air conditioning system.

2. The ventilation frequency reception unit, The duct type air conditioning system according to claim 1 , further comprising: a ventilation frequency instruction for each of the target spaces to be air-conditioned.

3. The ventilation frequency reception unit, The ducted air conditioning system according to claim 1, wherein a setting of zero ventilation rate for the space to be air-conditioned can be accepted.

4. The volume storage unit includes: The volume of the entire building to which each of the air conditioned spaces belongs is stored; The ventilation frequency reception unit, The instruction for the ventilation frequency for the entire building can be received, The control unit is 2. The ducted air conditioning system of claim 1, further comprising a function of calculating the output of a conveying fan from the ventilation rate for the entire building and the volume of the entire building, and controlling the damper opening degree acquisition unit to obtain an air volume ratio similar to the volume ratio of each air conditioned space using the pressure loss calculated by the duct pressure loss calculation unit and the damper pressure loss calculation unit, and the ventilation rate for the entire building.

5. The transport fan control unit is Calculating the air volume A to be transported by the transport fan from the ventilation frequency required for the entire building and the volume of the entire building; Calculating an air volume B to be transported by the transport fan from the total of the ventilation frequency required for each of the air conditioned spaces and the volume of the air conditioned spaces; The control unit is 5. A duct type air conditioning system according to claim 4, wherein the air volume A and the air volume B are compared, and the output of the transport fan and the opening of the air volume adjusting damper are controlled by giving priority to the setting of the larger air volume.

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