JP2022168323A - Selection method of additional ventilation device, selection method of additional ventilation device and air conditioning device, and air conditioning ventilation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a ventilation amount as one of measures against pathogenic infection.

SOLUTION: Provided is selection method of a second ventilation device 20 in newly installing another ventilation device as the second ventilation device 20 in an indoor space SI in which an existing first ventilation device 10 is installed. The existing first ventilation device 10 has a first ventilation amount as a ventilation amount per one hour. In a first step, a second ventilation amount is determined on the basis of a size of the indoor space. The second ventilation amount is a ventilation amount per one hour necessary for pathogenic infection measures. In a second step, a difference between the second ventilation amount and the first ventilation amount is determined as an additional ventilation amount. In a third step, a ventilation device capable of performing ventilation of the additional ventilation amount, is selected as the second ventilation device 20.

SELECTED DRAWING: Figure 1A

COPYRIGHT: (C)2023,JPO&INPIT

Description

The present invention relates to a method for selecting an additional ventilator, a method for selecting an additional ventilator and an air conditioner, and an air conditioning ventilation system.

2. Description of the Related Art Conventionally, a ventilator for exhausting indoor air to the outside and supplying outdoor air to a room has been widely used (for example, see Patent Document 1 (Japanese Patent Application Laid-Open No. 2005-300112)).

Many of the existing buildings are equipped with ventilators to provide some degree of ventilation.

On the other hand, recently, as one of the countermeasures against infection by pathogens such as viruses and bacteria (hereinafter referred to as pathogen infection), it is required to increase ventilation.

However, when replacing an existing ventilator, the equipment and installation costs are high.

The selection method of the additional ventilation device in the first viewpoint is the additional ventilation device when installing another ventilation device as an additional ventilation device for the indoor space where the existing first ventilation device is installed. This is the selection method. The existing first ventilator has a first ventilation volume per hour. The method for selecting an additional ventilator according to the first aspect comprises a first step, a second step, and a third step. The first step is to obtain a second ventilation volume based on the size of the indoor space. As the size of the indoor space, the floor area of the indoor space, the volume of the indoor space, the capacity of the indoor space, and the like can be used. The second ventilation is the ventilation per hour required as a countermeasure against pathogen infection. A second step obtains the difference between the second ventilation and the first ventilation as the additional ventilation. The third step is to select a ventilator capable of ventilating an additional ventilation volume as the additional ventilator.

Here, the first ventilation volume of the existing first ventilation device is used as it is, and the additional ventilation device supplements the insufficient ventilation volume (additional ventilation volume) with the additional ventilation device. Equipment is selected. This achieves the ventilation of the second tidal volume, which is required as a countermeasure against pathogen infection, while keeping costs down.

The method of selecting the additional ventilator and the air conditioner in the second aspect is a method of selecting the additional ventilator and the air conditioner in which the additional ventilator is selected by the selection method in the first aspect, and the air conditioner is further selected. be. An air conditioner is a device that air-conditions an indoor space. The method for selecting an additional ventilator and an air conditioner according to the second aspect includes first, second, and third steps, as well as fourth and fifth steps. A fourth step obtains the sum of the first air conditioning load, the second air conditioning load, and the third air conditioning load as the total air conditioning load. The first air conditioning load is determined based on the size of the indoor space. The second air conditioning load is the air conditioning load caused by ventilation by the existing first ventilation device. The third air conditioning load is the air conditioning load caused by ventilation by the additional ventilation device selected in the third step. A fifth step is to select an air conditioner having an air conditioning capacity capable of processing the total air conditioning load from a plurality of air conditioner candidates having different air conditioning capacities.

In addition to the existing first ventilation device, when an additional ventilation device is installed in the indoor space, it is assumed that ventilation by the additional ventilation device will increase the air conditioning load of the indoor space. If this is not considered, the thermal environment in the indoor space may deteriorate. In view of this, in the method of selecting an additional ventilator and an air conditioner according to the second aspect, it is possible to select an air conditioner that can handle the total air conditioning load including the air conditioning load caused by the ventilation of the additional ventilator.

The method for selecting the additional ventilator and the air conditioner of the third aspect is the selection method of the second aspect, wherein in the third step, the ventilator having the heat exchange section is selected as the additional ventilator. The heat exchange unit causes heat exchange between outside air that is supplied to the indoor space and return air that is exhausted from the indoor space. Also, in the fourth step, the third air conditioning load is obtained in consideration of the amount of heat exchanged in the heat exchange section of the selected additional ventilation device.

Here, a ventilator having a heat exchange part for heat exchange between supply air and exhaust air is selected as the additional ventilator. Therefore, deterioration of the thermal environment in the indoor space due to ventilation by the additional ventilation device can be suppressed. Since the third air-conditioning load is obtained in consideration of the amount of heat exchanged in the heat exchange section, the total air-conditioning load is not calculated excessively. As a result, it is possible to correctly recognize the required air conditioning capacity of the air conditioner and to select an air conditioner that is neither excessive nor deficient.

The method for selecting an additional ventilator and an air conditioner according to the fourth aspect is the method according to the second aspect or the third aspect, and further includes a sixth step and a seventh step. In the sixth step, it is determined whether the air volume at the maximum ventilation volume of the additional ventilation device selected in the third step is 30% or less of the rated air volume of the air conditioner selected in the fifth step. . In the seventh step, if it is determined in the sixth step that the air volume at the maximum ventilation volume of the additional ventilation device exceeds 30% of the rated air volume of the air conditioner, the selection of the additional ventilation device and the air conditioner is reviewed. .

If the air volume at the maximum ventilation volume of the additional ventilation system exceeds 30% of the rated air volume of the air conditioner, even if the total air conditioning load can be handled by the air conditioning capacity of the air conditioner, the operating efficiency of the air conditioner will be low. There is a risk that the running cost will be high due to deterioration. In view of this, in the method for selecting the additional ventilator and the air conditioner of the fourth aspect, the sixth step and the seventh step are further performed, and the selection of the additional ventilator and the air conditioner is reviewed. As a result, for example, it is possible to select an air conditioner with a higher rated air volume and air conditioning capacity, thereby reducing running costs for air conditioning and ventilation.

The selection method of the additional ventilation device and the air conditioner of the fifth aspect is the selection method of any one of the second aspect to the fourth aspect, wherein in the third step, a plurality of ventilation device candidates with different maximum ventilation volumes are selected. From among them, an additional ventilation device is selected. Also, the number of multiple air conditioner candidates in the fifth step is greater than the number of multiple ventilator candidates in the third step.

Here, by preparing many air conditioner candidates, it becomes possible to select a more appropriate air conditioner according to the selected additional ventilator. As a result, the cost of the device and the installation cost of the device can be suppressed.

The air conditioning ventilation system of the sixth aspect is installed in an indoor space where the existing first ventilation device with a floor area of 70 m ² or more and 95 m ² or less and a ventilation volume per hour of the first ventilation volume is installed. An air-conditioning and ventilation system comprising an air conditioner with a cooling rated capacity of about 12.5 kW and a ventilation system with a maximum ventilation volume of 250 m ³ /h.

If this air conditioning ventilation system is installed in an indoor space in an existing building, the indoor space with the above floor area where the first ventilation volume is secured, the ventilation volume required as a countermeasure against pathogen infection can be reduced. can be obtained, and the total air conditioning load of the indoor space, including the air conditioning load due to the increased ventilation, can be processed by the air conditioner.

The air conditioning ventilation system of the seventh aspect is installed in an indoor space where the existing first ventilation device with a floor area of 40 m ² or more and 60 m ² or less and an hourly ventilation rate of the first ventilation rate is installed. An air-conditioning and ventilation system comprising an air conditioner with a cooling rated capacity of about 7.1 kW and a ventilation system with a maximum ventilation volume of 150 m ³ /h.

If this air conditioning ventilation system is installed in an indoor space in an existing building, the indoor space with the above floor area where the first ventilation volume is secured, the ventilation volume required as a countermeasure against pathogen infection can be reduced. can be obtained, and the total air conditioning load of the indoor space, including the air conditioning load due to the increased ventilation, can be processed by the air conditioner.

The air-conditioning/ventilation system of the eighth aspect is the air-conditioning/ventilation system of the sixth aspect or the seventh aspect, wherein the air conditioner has an air supply port. The air inlet receives air supply from outside the indoor space. The ventilation device has an air supply fan. The supply air fan is a fan for sending outside air to the air conditioner as supply air. Moreover, the air-conditioning/ventilating system of the eighth aspect further includes an air supply path forming member. The air supply path forming member is connected to the ventilation device and the air conditioner to form an air supply path. An air supply path is an air flow path that guides supply air from a ventilator to an air supply port of an air conditioner.

Since this air conditioning ventilation system is packaged with a ventilator, an air conditioner, and an air supply path forming member, it is possible to connect the ventilator and the air conditioner using locally procured parts such as ducts. Introductory costs, including the cost of installation work, can be reduced compared to . In addition, since the air supply from the ventilator can be received by the air conditioner, it is possible to change the temperature of the supply air in the air conditioner before supplying it to the indoor space.

The air-conditioning and ventilation system of the ninth aspect is the air-conditioning and ventilation system of the eighth aspect, wherein the ventilation device further includes a casing, an exhaust fan, and a heat exchanger. A casing houses an intake fan and an exhaust fan. An exhaust fan is a fan for sending the air in the indoor space to the outside of the indoor space as exhaust air. The heat exchanger exchanges heat between outside air and exhaust air. A first opening, a second opening, a third opening, and a fourth opening are formed in the casing. The third opening is an opening for taking in outside air. An air supply path forming member is connected to the fourth opening. The first opening is an opening for taking in air in the indoor space as return air. The second opening is an opening for sending the return air out of the indoor space as exhaust air. Moreover, the air-conditioning/ventilation system of the ninth aspect further includes a pressure adjusting section. The pressure adjustment unit reduces the difference between the pressure of the return air flowing from the first opening to the second opening in the ventilator and the pressure of the outside air flowing from the third opening to the fourth opening in the ventilator, Adjust air pressure.

Here, when the exhaust fan operates, the air in the indoor space is taken into the casing through the first opening as return air, and is sent out of the indoor space through the second opening as exhaust air. Further, when the air supply fan operates, outside air is taken into the casing from the third opening, flows from the third opening to the fourth opening, and is sent to the air conditioner from the fourth opening through the air supply passage. be done. The return air taken into the casing through the first opening and the outside air taken into the casing through the third opening are heat-exchanged in the heat exchanger. As a result, it is possible to suppress an increase in the air-conditioning load of the indoor space due to ventilation.

Further, the air-conditioning/ventilating system of the ninth aspect is provided with a pressure adjusting section so as to reduce the difference between the pressure of the outside air and the pressure of the return air that exchange heat with each other. As a result, problems such as mixing of outside air and return air in a heat exchanger or the like can be suppressed.

An air-conditioning and ventilation system according to a tenth aspect is the air-conditioning and ventilation system according to any one of the sixth to ninth aspects, further comprising a remote controller for controlling the air conditioner and the ventilation device.

Here, for example, a remote controller can be used to interlock the operation/stop of an air conditioner and a ventilation device, or to control ventilation by a ventilation device when the air conditioner is not operating. becomes possible.

1 is a state diagram of a building with a first ventilation device and an air conditioning ventilation system installed; FIG. Fig. 2 is a state diagram of the building before the second ventilation device is additionally installed; Fig. 2 is an assembly perspective view of an air conditioning indoor unit, an air supply intake member attached to the air conditioning indoor unit, and an air supply duct; It is a control block diagram of an air-conditioning ventilation system. It is a figure which shows the indoor ventilation state by the 1st ventilator before installing a 2nd ventilator. FIG. 10 is a diagram showing the indoor ventilation state when the window is opened to increase the ventilation rate without installing the second ventilation device. It is a figure which shows the indoor ventilation state at the time of installing a 2nd ventilator additionally. FIG. 10 is a table showing various numerical values for combinations of second ventilator candidates and air conditioner indoor unit candidates; FIG.

(1) Overall Configuration of First Ventilation Device and Air Conditioning Ventilation System FIG. 1A shows the installation state of the first ventilation device 10 and the air conditioning ventilation system 100 in the building H. The first ventilation device 10 and the air conditioning ventilation system 100 are installed for one predetermined indoor space SI in the building H. The air conditioning ventilation system 100 mainly includes a second ventilation device 20, an air conditioning indoor unit 30, ducts 21 to 24, and a remote controller 90.

The first ventilation device 10 is a ventilation device that has already been installed in the indoor space SI before the second ventilation device 20 is installed.

The air conditioning indoor unit 30 of the air conditioning ventilation system 100 is also equipment that has already been installed in the indoor space SI before the second ventilation device 20 is installed.

FIG. 1B shows the state of the building H before the second ventilation device 20 is installed.

The second ventilation device 20 and the ducts 21 to 24 of the air-conditioning ventilation system 100 are additionally installed later in the indoor space SI in which the first ventilation device 10 and the air-conditioning indoor unit 30 are already installed. .

In this embodiment, the first ventilation device 10 and the air conditioning indoor unit 30 shown in FIGS. 1A and 1B are already installed, and the second ventilation device 20 and the ducts 21 to 24 shown in FIG. 1A are to be installed now. Explanation is given assuming that it is in the design study stage.

(2) Details of First Ventilation Device The first ventilation device 10 is a ventilation fan having a propeller fan or a ventilation device having a sirocco fan. The first ventilation device 10 shown in FIGS. 1A and 1B sucks indoor air in the indoor space SI and discharges it to the outside of the building H (outdoor space SO). An intake port of the first ventilator 10 is connected to a first return air port 16 provided in the ceiling of the indoor space SI. A blower port of the first ventilation device 10 is connected to a first exhaust port 18 opened in the outer wall of the building H. The first ventilator 10 has, for example, a ventilation volume of 500 m ³ /h.

(3) Details of Air Conditioner Indoor Unit The air conditioner indoor unit 30 is a device that constitutes an air conditioner together with an air conditioner outdoor unit (not shown) installed on the roof of the building H or outside. The air conditioner is a device that cools or heats the indoor space SI using a vapor compression refrigeration cycle. As shown in FIG. 1A or 1B, the air conditioning indoor unit 30 includes a heat exchanger 37 that constitutes a refrigeration cycle, an indoor fan 35 that sends indoor air to the heat exchanger 37 and returns it to the indoor space SI, and the like. is doing. The casing of the air conditioning indoor unit 30 is rectangular in plan view, has an intake port 31 formed in the center of the lower surface, and has outlets 32 formed along the four sides of the lower surface. Indoor air is sucked from the suction port 31 (see arrow Ain in FIG. 1A), and air after air conditioning is returned to the indoor space SI from the blowout port 32 (see arrow Aout in FIG. 1A).

Moreover, the supply air intake member 30a shown in FIG. 2 is attached as an optional device to the air conditioning indoor unit 30 shown in FIG. 1A. The supply air intake member 30a is a member that forms a flow path through which air flows. The air entering from the inlet 33 of the supply air intake member 30 a flows out near the suction port 31 of the casing of the air conditioning indoor unit 30 .

(4) Details of the second ventilator and ducts, which together with the air conditioner indoor unit constitute the air conditioning ventilation system, The second ventilator 20 is arranged in the space SC behind the ceiling of the indoor space SI of the building H, and ventilates the indoor space SI. while performing heat exchange between the outside air OA, which is the supply air SA, and the return air RA, which is the exhaust air EA.

The ducts 21 - 24 are a return air duct 21 , an exhaust duct 22 , an outside air introduction duct 23 and a supply air duct 24 .

The second ventilation device 20 has a casing 50 , an air supply fan 26 , an exhaust fan 28 , a heat exchange element 40 having a substantially rectangular prism shape, and a ventilation control section 70 .

The casing 50 houses therein the heat exchange element 40, the air supply fan 26, the exhaust fan 28, and the like. The casing 50 also has a first opening 51 connected to the return air duct 21, a second opening 52 connected to the exhaust duct 22, a third opening 53 connected to the outside air introduction duct 23, and a supply air duct. A fourth opening 54 to which 24 is connected is formed.

Inside the casing 50, there are a first space 51a between the first opening 51 and the heat exchange element 40, a second space 52a between the second opening 52 and the heat exchange element 40, a third opening 53 and heat exchange elements. A third space 53a between the element 40 and a fourth space 54a between the fourth opening 54 and the heat exchange element 40 are present.

The air supply fan 26 is arranged in the fourth space 54a and has an air supply fan motor 26m. The exhaust fan 28 is arranged in the second space 52a and has an exhaust fan motor 28m.

The return air duct 21 connects the first opening 51 of the second ventilator 20 and the second return air port 81 provided in the ceiling of the indoor space SI to form a return air passage 21a through which the return air RA flows. .

The exhaust duct 22 connects the second opening 52 of the second ventilation device 20 and the second exhaust port 82 opened in the outer wall of the building H to form an exhaust path 22a through which the exhaust EA flows.

The outside air introduction duct 23 connects the third opening 53 of the second ventilation device 20 and an outside air introduction port 83 opened in the outer wall of the building H to form an outside air introduction path 23a through which the outside air OA flows.

The supply air duct 24 connects the fourth opening 54 of the second ventilation device 20 and the inlet 33 of the supply air intake member 30a additionally installed in the air conditioning indoor unit 30, and the supply air path 24a through which the supply air SA flows. to form The supply air duct 24 is bifurcated and connected to two inlets 33 . Dividing into two halves can increase the air passage area and reduce the pressure loss in the air supply duct.

The ventilation control unit 70 is connected to the air supply fan motor 26m, the exhaust fan motor 28m, the remote controller 90, etc., as shown in FIG. The ventilation control unit 70 is implemented by a computer. The ventilation control unit 70 includes a control arithmetic device and a storage device. A processor, such as a CPU or a GPU, can be used for the control computing unit. The control arithmetic device reads a program stored in the storage device and performs predetermined image processing and arithmetic processing according to the program. Furthermore, the control arithmetic unit can write the arithmetic result to the storage device and read the information stored in the storage device according to the program. The ventilation control unit 70 turns ON/OFF the air supply fan 26 and the exhaust fan 28 in accordance with a command from a remote controller 90, which will be described later.

Although illustration and description are omitted here, it is also possible to connect the outside air temperature sensor or the room temperature sensor to the ventilation control unit 70 and use the sensor values for control.

(5) Details of Remote Controller The remote controller 90 is used by the user in the indoor space SI to perform various setting operations for the air conditioning indoor unit 30 and the second ventilator 20 . The remote controller 90 is also implemented by a computer, like the ventilation control unit 70 .

The remote controller 90, the ventilation control unit 70, and the control unit (not shown) of the air conditioning indoor unit 30 are connected via communication lines.

(6) Details of Ventilation by Air Conditioning Ventilation System The remote controller 90 operates the second ventilation device 20 when the indoor fan 35 of the air conditioning indoor unit 30 is operating. In other words, the remote controller 90 also operates the air conditioner indoor unit 30 when the second ventilator 20 needs to be operated. When the air supply fan 26 and the exhaust fan 28 of the second ventilation device 20 operate, the outside air OA of the outdoor space SO reaches the heat exchange element 40 from the outside air introduction path 23a, and the air passing through the heat exchange element 40 is supplied air. It passes through the fan 26 and is supplied to the indoor space SI as fresh supply air SA. The indoor air in the indoor space SI reaches the heat exchange element 40 as the return air RA through the return air passage 21a, and the air that has passed through the heat exchange element 40 passes through the exhaust fan 28 and becomes the exhaust EA to the outdoor space SO. discharged to

In the heat exchange element 40 , heat is exchanged between the outside air OA and the return air RA, thereby suppressing an increase in the air conditioning load due to ventilation by the second ventilation device 20 .

(7) Method for selecting a second ventilation device to be additionally installed to increase the amount of ventilation in the indoor space, and method for selecting an air conditioning indoor unit As shown in FIG. 1B, the first ventilation device 10 and the air conditioning indoor unit 30 Assume that it is required to increase the amount of ventilation in the indoor space SI of the building H where the building is installed as one of the countermeasures against infection by pathogens such as viruses and bacteria. For example, the ventilation volume was designed at 20 m ³ /h per person, and the ventilation volume of the first ventilation device 10 was determined, but the ventilation volume is further required to be 10 m ³ /h, for a total ventilation volume of 30 m ³ /h. is assumed. In other words, it is required to increase the current ventilation volume by 1.5 times. In that case, the second ventilator 20 to be additionally installed is selected by the following steps.

(7-1) Method for Selecting Second Ventilation Device First, in the first step, the second ventilation volume required for the additionally installed second ventilation device 20 is obtained based on the size of the indoor space SI. In this embodiment, the first step includes calculating the maximum number of people entering the indoor space SI, and calculating the ventilation required in the indoor space SI from the maximum number of people. Specifically, the amount of ventilation required in the indoor space SI is determined by the floor area (m ² ) of the indoor space SI per person, which is determined by the use (general store, office, etc.) of the indoor space SI (room). It is the value obtained by dividing the value by the area (m ² ) and multiplying it by the required ventilation per person per hour (m ³ /h). The exclusive area (m ² ) per person determined by the use of the indoor space SI is, for example, 3 m ² , 5 m ² , etc., depending on the use. The required ventilation rate may be calculated using the volume (m ³ ) of the indoor space SI or the required ventilation frequency of the room.

The first ventilation (m ³ /h) is the ventilation required for the indoor space SI based on, for example, a person's carbon dioxide emissions. The second ventilation volume (m ³ /h) is the ventilation volume per hour required in the indoor space SI as a countermeasure against pathogen infection. Pathogens to be treated against infection are, for example, viruses or bacteria such as influenza virus, norovirus, coronavirus, tubercle bacillus, and the like. The second ventilation (m ³ /h) is a larger value than the first ventilation (m ³ /h).

Next, in the second step, the difference between the second ventilation volume and the first ventilation volume is obtained as the additional ventilation volume (m ³ /h). The first ventilation volume (m ³ /h) is the ventilation volume of the first ventilation device 10 already installed in the indoor space SI.

Next, in the third step, a ventilator capable of ventilation with an additional ventilation amount is selected as the second ventilator 20 to be added. In the third step, the second ventilator 20 is selected from ventilator candidates V1 to V6 shown in (7-2) below.

(7-2) Ventilator Candidates V1 to V6
Candidates for ventilators are:
a ventilator V1 with a ventilation volume of 150 m ³ /h,
Ventilator V2 with a ventilation volume of 250 m ³ /h,
Ventilator V3 with a ventilation volume of 350 m ³ /h,
Ventilator V4 with a ventilation volume of 500 m ³ /h,
a ventilator V5 with a ventilation volume of 650 m ³ /h, and
Ventilator V6 with a ventilation volume of 800 m ³ /h,
is.

(7-3) Method for Selecting Air Conditioner Indoor Unit After the selection of the second ventilator 20 in the third step, the process proceeds to the fourth step. In the fourth step, the sum of the first air conditioning load, the second air conditioning load and the third air conditioning load is obtained as the total air conditioning load. The first air conditioning load is an air conditioning load that is determined based on the size of the indoor space SI, and is based on the heat load of people and equipment in the room, the solar heat that enters through windows and walls, and the temperature difference between inside and outside. It is obtained by totaling the heat load, etc. Depending on the use (general store, office, etc.) of the indoor space SI (room) of the building H, the air conditioning load (first air conditioning load) for cooling and heating per unit floor area is known. A second air conditioning load is an air conditioning load caused by ventilation by the existing first ventilation device 10 . When ventilation is performed, outside air is taken into the indoor space SI through ducts, door gaps, and the like, and a load is generated to keep the outside air at the indoor temperature and humidity. This outside air load is the second air conditioning load caused by ventilation. The third air conditioning load is the air conditioning load caused by the ventilation of the second ventilator 20 selected in the third step.

Note that in the fourth step, the third air conditioning load is obtained in consideration of the amount of heat exchanged between the outside air OA and the return air RA in the heat exchange element 40 of the second ventilator 20 . The heat exchange element 40 is provided to recover all the heat (sensible heat and latent heat) of the air conditioning energy lost by ventilation, and the amount recovered is taken into account in the fourth step.

In a fifth step, an air conditioning indoor unit 30 having an air conditioning capacity capable of processing the total air conditioning load is selected from among multiple air conditioning indoor unit candidates with different air conditioning capacities. Here, the air conditioner indoor unit 30 is selected from the air conditioner indoor unit candidates A1 to A9 shown in (7-4) below.

(7-4) Air conditioning indoor unit candidates A1 to A9
Candidates for air conditioning indoor units for indoor space SI, which is used by general stores, are:
1.5 hp (3.6 kW) air conditioning indoor unit A1, suitable for 22-25 m ² floor space;
1.8 hp (4.0 kW) air conditioning indoor unit A2, suitable for 25-28 m ² floor space;
2 hp (4.5 kW) air conditioning indoor unit A3, suitable for 28-31 m ² floor space;
2.3 hp (5.0 kW) air conditioning indoor unit A4, suitable for ^floor space of 31-35m2;
2.5 hp (5.6 kW) air conditioning indoor unit A5, suitable for ^floor space of 35-39m2;
3 hp (7.1 kW) air conditioning indoor unit A6, suitable for 44-50 m ² floor space;
4 hp (10.0 kW) air conditioning indoor unit A7, suitable for 62-70 m ² floor space;
5 hp (12.5 kW) air conditioning indoor unit A8, suitable for 78-88 m ² floor space, and
6 hp (14.0 kW) air conditioning indoor unit A9, suitable for 89-100 m ² floor space;
is. The number of air conditioner indoor unit candidates A1 to A9 is greater than the number of ventilator candidates V1 to V6.

(7-5) Review of Selection of Second Ventilation Device and Air Conditioning Indoor Unit In the sixth step, the air volume at the maximum ventilation volume of the second ventilation device 20 selected in the third step is selected in the fifth step. 30% or less of the rated air volume of the air conditioning indoor unit 30 is determined.

Next, in the seventh step, if it is determined in the sixth step that the air volume at the maximum ventilation volume of the second ventilation device 20 exceeds 30% of the rated air volume of the air conditioning indoor unit 30, the second ventilation device and Review the selection of air conditioning indoor units. In the selection review, the air conditioner indoor unit 30 is newly selected from among the air conditioner indoor unit candidates with a larger rated air volume, or the second ventilator 20 is newly selected from among the ventilator candidates with a smaller maximum ventilation amount. be done.

(7-6) Specific Example of Selection Next, referring to FIGS. A specific example of selection of the second ventilator 20 when the second ventilator 20 is additionally installed will be described.

As shown in FIG. 4A, for example, in an indoor space SI of a store, an air conditioner indoor unit 30 with 5 horsepower (5 HP) and a first ventilation device 10 with a ventilation volume of 500 m ³ /h are installed. and The exclusive area per person (m ² ) determined by the use of the indoor space SI is 3 m ² in the case of a general store. In a store where the floor area of the indoor space SI is 75 m ² and the number of people accommodated in the indoor space SI is 25, and the ventilation rate was designed to be 20 m ³ /h per person in the past, the ventilation rate is 500 m ³ /h. The first ventilator 10 of h is installed. In a general store, the 12.5 kW air-conditioning capacity of the 5-horsepower air-conditioning indoor unit 30 can air-condition a room with a floor area of 83 m ³ . On the other hand, in the case of the current ventilation rate of 500 m ³ /h, the required air conditioning capacity for the indoor space SI of a general store with a floor area of 75 m ² is 11.3 kW. Therefore, the 5-horsepower air conditioning indoor unit 30 has a spare capacity of about 10% with respect to the floor area of the current indoor space SI of 75 m ² .

If this store wants to increase the current ventilation volume (20 m ³ /h per person) as a countermeasure against pathogen infection and secure a total ventilation volume (per person) of 30 m ³ /h for the indoor space SI, As a simple method, window opening ventilation is a candidate.

In the case of window-opening ventilation, as shown in FIG. 4B, it is necessary to open the window and additionally introduce 250 m ³ /h of outside air into the indoor space SI. However, opening the window causes problems such as an increase in noise, invasion of insects into the indoor space SI, and appearance of temperature unevenness in the indoor space SI, which hinders the comfort of the shop's customers. Also, as an increase in the air conditioning load due to the introduction of outside air, for example, when the outside air temperature is 35°C and the indoor temperature is 27°C, the outside air load increases by 1.5 kW, and the floor area of the indoor space SI is 75 ^m2 , and the load is 12.8 kW ( = 11.3 kW + 1.5 kW). On the other hand, since the air conditioning capacity (12.5 kW) of the existing 5-horsepower air conditioning indoor unit 30 is insufficient, stores that open the windows for ventilation remove the 5-horsepower air conditioning indoor unit 30 and newly add 6 horsepower. (14.0 kW) air conditioning indoor unit must be installed.

On the other hand, if the selection methods shown in (7-1) to (7-5) above are adopted as a method of securing a total ventilation volume of 30 m ³ /h for the indoor space SI, the initial cost and running cost can be reduced. It is possible to secure the ventilation amount of the indoor space SI and process the air conditioning load while suppressing the cost.

Using the above selection method, first in step 1, based on the size of the indoor space SI (floor area 75 m ² and capacity of 25 people), the second ventilation volume required for the indoor space SI as a countermeasure against pathogen infection Ask for Here, as a countermeasure against pathogen infection, 30 m ³ /h per person is required, and the second ventilation is found as 750 m ³ /h (25×30 m ³ /h).

Next, in the second step, the difference between the second ventilation volume and the first ventilation volume is obtained as the additional ventilation volume (m ³ /h). The additional ventilation volume is determined as 250 m ³ /h (second ventilation volume 750 m ³ /h - first ventilation volume 500 m ³ /h of the first ventilation device 10).

Next, in the third step, a ventilator capable of ventilation with an additional ventilation amount is selected from among the ventilator candidates V1 to V6, and is selected as the second ventilator 20. FIG. Here, the ventilator V2 with a ventilation volume of 250 m ³ /h is selected as the second ventilator 20 .

Next, in a fourth step, the sum of the first air conditioning load, the second air conditioning load and the third air conditioning load is obtained as the total air conditioning load. The second air conditioning load is the air conditioning load caused by ventilation by the existing first ventilation device 10, as described above. The sum of the second air conditioning load generated by ventilation (ventilation volume of 500 m ³ /h) by the existing first ventilation device 10 and the first air conditioning load is, in the case of an indoor space SI with a floor area of 75 m ² in a general store, It becomes 11.3 kW mentioned above. The third air-conditioning load is an additional air-conditioning load associated with the ventilation operation of the second ventilator 20 caused by the additional installation of the second ventilator 20 . Additional air-conditioning load (third air-conditioning load) is when the outside air temperature is 35°C and the room temperature is 27°C when the ventilation device selected as the second ventilation device 20 is the ventilation device V2 with a ventilation volume of 250 m ³ /h. 0.6 kW. In the case of window opening ventilation, the load is 1.5 kW under the same conditions, but when the second ventilation device 20 is adopted, the total heat exchange is performed in the heat exchange element 40, so the additional air conditioning load is 0.6 kW. . Therefore, the total air conditioning load is 11.9 kW (11.3 kW+0.6 kW).

For reference, FIG. 5 shows the additional air conditioning load and other numerical values for each combination of the second ventilator 20 candidate and the air conditioning indoor unit 30 candidate.

Next, in a fifth step, an air conditioning indoor unit 30 having an air conditioning capacity capable of processing the total air conditioning load is selected from the air conditioning indoor unit candidates A1 to A9. Here, the 5-horsepower (12.5 kW) air conditioner indoor unit A8 already installed in the indoor space SI is selected as the air conditioner indoor unit 30 . This is because the total air conditioning load (11.9 kW) can be processed with 5 horsepower (12.5 kW).

Next, in the sixth step, the air volume at the maximum ventilation volume of the second ventilation device 20 selected in the third step is 30% or less of the rated air volume of the air conditioning indoor unit 30 selected in the fifth step. Determine whether or not Here, the air volume at the maximum ventilation volume of the second ventilation device 20 is 30% or less of the rated air volume of the air conditioning indoor unit 30 . Therefore, the selection of the second ventilation device and the air conditioning indoor unit in the seventh step is not reviewed.

Thus, here, as shown in FIG. 4C, a second ventilator 20 having a heat exchange element 40 for performing total heat exchange is additionally installed, and the second ventilator 20 and the existing 5-horsepower air conditioner are installed. The indoor unit 30 constitutes the air conditioning ventilation system 100 .

As described above, when window opening ventilation is adopted as a countermeasure against pathogen infection, the 5-horsepower air conditioning indoor unit 30 must be removed and a new 6-horsepower (14.0 kW) air conditioning indoor unit must be installed. However, when additionally installing the second ventilation device 20 having the heat exchange element 40 for performing total heat exchange, the existing 5-horsepower air conditioning indoor unit 30 can be used as it is.

(8) Characteristics of the selection method of the second ventilation system (8-1)
According to the method of selecting the second ventilator described in (7) above, the first ventilation volume of the existing first ventilation device 10 is used as it is, and the insufficient additional ventilation volume is ventilated by the second ventilation device 20. The second ventilator 20 is selected in line with the idea of supplementing, which has never existed before. This achieves the ventilation of the second tidal volume, which is required as a countermeasure against pathogen infection, while keeping costs down.

(8-2)
If an additional second ventilator 20 is installed in the indoor space SI in addition to the existing first ventilator 10, it is assumed that ventilation by the second ventilator 20 will increase the air conditioning load of the indoor space SI. If this is not considered, the thermal environment of the indoor space SI may deteriorate. In view of this, in the method of selecting the second ventilation device 20 and the air conditioning indoor unit 30 described above, the air conditioning indoor unit 30 that can handle the total air conditioning load including the air conditioning load caused by ventilation is selected. As a result, it is possible to determine whether the air conditioning indoor unit 30 already installed in the indoor space SI can be used as it is, or whether it is necessary to replace it with a new air conditioning indoor unit 30 having a higher air conditioning capacity. .

(8-3)
In the method of selecting the second ventilator described in (7) above, the second ventilator 20 having the heat exchange element 40 for exchanging heat between the supply air SA and the exhaust EA is used as an additional ventilator. have selected. Therefore, deterioration of the thermal environment of the indoor space SI due to ventilation by the second ventilation device 20 can be suppressed to a small extent. Since the third air-conditioning load (air-conditioning load associated with additional ventilation) is obtained in consideration of the amount of heat exchanged by the heat exchange element 40, the total air-conditioning load will not be calculated excessively. As a result, the required air conditioning capacity is correctly recognized, and the air conditioning indoor unit 30 that is just right is selected.

(8-4)
When the air volume at the maximum ventilation volume of the second ventilation device 20 added as a countermeasure against pathogen infection exceeds 30% of the rated air volume of the air conditioning indoor unit 30, the air conditioning capacity of the air conditioning indoor unit 30 can handle the total air conditioning load. Even if this is the case, the operating efficiency of the air conditioner may deteriorate and the running cost may become high. In view of this, in the method for selecting the second ventilator and the air conditioner indoor unit of the present embodiment, the sixth step and the seventh step are performed to review the selection of the second ventilator and the air conditioner indoor unit. As a result, for example, an air conditioner indoor unit with a higher rated air volume and air conditioning capacity can be selected, thereby reducing running costs for air conditioning and ventilation.

(8-5)
In the above embodiment, selecting a more suitable air conditioning indoor unit 30 according to the selected second ventilation device 20 by preparing many air conditioning indoor unit candidates shown in (7-4) above; will be able to As a result, the running cost and installation cost of the air conditioning ventilation system 100 can be suppressed.

(9) Variations and characteristics of air-conditioning and ventilation systems (9-1)
In the air conditioning ventilation system 100 of (1) to (6) above, the air conditioning indoor unit 30 has already been installed, but the air conditioning ventilation system 100 includes the second ventilator 20, the air conditioning indoor unit 30, and The ducts 21-24, such as the air supply duct 24 that forms the flow path for the air supply SA, may be packaged. Ducts 21 to 24 connected to the second ventilation device so that the air volume supplied to the room reaches the target ventilation air volume when the fan of the second ventilation device 20 is operated at a predetermined number of rotations, and an air supply intake member described later. 30a is configured to have a constant flow resistance. Being packaged means that the desired flow resistance is generated simply by connecting the ducts 21 to 24 having flow resistance and the supply air intake member 30 to the air conditioning indoor unit 30 and the second ventilation device 20, and as a result, the on-site means a system that can supply the target ventilation airflow without the need to calculate the flow resistance in If the packaged air conditioning ventilation system 100 is adopted, compared to the case where the ventilation device and the indoor unit of the air conditioner are connected using locally procured parts such as ducts, introduction costs including installation work costs are reduced. is suppressed.

(9-2)
In addition, in the air conditioning ventilation system 100, since the supply air SA from the second ventilation device 20 enters the air conditioning indoor unit 30, the temperature or humidity of the supply air SA is adjusted by the air conditioning indoor unit 30, and then the indoor space SI can be supplied to

(9-3)
The air conditioning ventilation system 100 includes a remote controller 90 that controls the air conditioning indoor unit 30 and the second ventilation device 20 . As a result, the operation/stop of the air conditioning indoor unit 30 and the second ventilation device 20 is interlocked, or the ventilation by the second ventilation device 20 is not performed when the air conditioning indoor unit 30 is not operating. it becomes possible to

In the air-conditioning and ventilation system 100, if ventilation is performed by the second ventilation device 20 while the air-conditioning indoor unit 30 is not operating, dust attached to the suction filter of the air-conditioning indoor unit 30 falls into the indoor space SI. Malfunction may occur. This problem can be prevented by installing the remote controller 90 and interlocking control between the air conditioning indoor unit 30 and the second ventilation device 20 .

(10) Specific examples of air-conditioning and ventilation systems (10-1)
In the specific example of selection of the second ventilator in (7-6) above, in the indoor space SI (floor area 75 m ² ) of a certain store, the air conditioning indoor unit 30 with 5 horsepower (5 HP) and the ventilation volume of 500 m ³ Assuming that the first ventilation device 10 of /h is installed, as a countermeasure against pathogen infection, the current ventilation volume (20 m ³ /h per person) is increased, and the total ventilation volume per person is 30 m ³ /h. has been described for the indoor space SI.

Based on the same concept as this specific example, an air conditioning ventilation system installed in an indoor space with a floor area of 70 m ² or more and 95 m ² or less will have an air conditioning indoor unit with a cooling rated capacity of a second ventilator having a ventilation volume of 250 m ³ /h.

This air-conditioning ventilation system is used in an indoor space in an existing building, and the above-mentioned floor area where the first ventilation rate (for example, twice the maximum ventilation rate of the second ventilation device) is secured. If installed in a space, it is possible to obtain the necessary ventilation volume as a countermeasure against pathogen infection, and the total air conditioning load of the indoor space including the air conditioning load due to the increased ventilation volume can be processed by the air conditioner.

(10-2)
In the specific example of selection of the second ventilator in (7-6) above, in the indoor space SI (floor area 75 m ² ) of a certain store, the air conditioning indoor unit 30 with 5 horsepower (5 HP) and the ventilation volume of 500 m ³ Assuming that the first ventilation device 10 of /h is installed, as a countermeasure against pathogen infection, the current ventilation volume (20 m ³ /h per person) is increased, and the total ventilation volume per person is 30 m ³ /h. has been described for the indoor space SI.

Based on the same concept as this specific example, an air conditioning ventilation system installed in an indoor space with a floor area of 40 m ² or more and 60 m ² or less will have an air conditioning indoor unit with a cooling rated capacity of a second ventilator having a ventilation volume of 150 m ³ /h.

This air-conditioning ventilation system is used in an indoor space in an existing building, and the above-mentioned floor area where the first ventilation rate (for example, twice the maximum ventilation rate of the second ventilation device) is secured. If installed in a space, it is possible to obtain the necessary ventilation volume as a countermeasure against pathogen infection, and the total air conditioning load of the indoor space including the air conditioning load due to the increased ventilation volume can be processed by the air conditioner.

(11) Modification (11-1)
In the air conditioning ventilation system 100 of the above embodiment, the indoor air in the indoor space SI reaches the heat exchange element 40 as the return air RA through the return air passage 21a. As a result, the exhaust gas EA is discharged to the outdoor space SO. On the other hand, the outside air OA of the outdoor space SO reaches the heat exchange element 40 from the outside air introduction passage 23a, and the air passing through the heat exchange element 40 passes through the air supply fan 26 and is supplied to the indoor space SI as fresh supply air SA. be done. However, the supply air SA requires a certain amount of static pressure in order to pass through a narrow flow path in the air conditioning indoor unit 30 to which the supply air intake member 30a is attached. Therefore, a pressure difference may occur between the flow paths of return air RA and exhaust EA with low flow resistance and the flow paths of outside air OA and supply air SA with high flow resistance.

For this reason, when the pressure loss of the supply air SA becomes considerably large, it is preferable to additionally provide a pressure regulator in the air conditioning ventilation system 100 .

For example, as a pressure adjustment unit, a decompression member 58 such as a baffle or a damper is provided in the first space 51a of the second ventilator 20 of FIG. 1A to increase the flow resistance of the return air RA and the exhaust EA. As a result, the above-described pressure difference is reduced, and the problem of mixing of outside air and return air in the heat exchange element 40 hardly occurs.

(11-2)
Although embodiments of the present disclosure have been described above, it will be appreciated that various changes in form and detail may be made without departing from the spirit and scope of the present disclosure as set forth in the appended claims. .

10 first ventilator 20 second ventilator (ventilator, additional ventilator)
24 air supply passage forming member 24a air supply passage 26 air supply fan 28 exhaust fan 30 air conditioning indoor unit (air conditioner)
30a Air intake member 33 Inlet of air intake member (air inlet)
40 heat exchange element 51 first opening 52 second opening 53 third opening 54 fourth opening 58 decompression member (pressure adjusting section)
90 remote control (controller)
100 Air conditioning ventilation system EA Exhaust air OA Outside air RA Return air SA Supply air SI Indoor space SO Outdoor space (outside the indoor space)

Japanese Patent Application Laid-Open No. 2005-300112

Claims (9)

Another ventilation device is newly installed as an additional ventilation device (20) for the indoor space (SI) in which the existing first ventilation device (10) having the first ventilation rate per hour is installed. A method for selecting an additional ventilation device when installed in
A first step of obtaining a second ventilation volume, which is a ventilation volume per hour required as a countermeasure against pathogen infection, based on the size of the indoor space (SI);
a second step of obtaining a difference between the second ventilation volume and the first ventilation volume as an additional ventilation volume;
a third step of selecting a ventilator capable of ventilation of the additional ventilation volume as an additional ventilator (20);
A method for selecting an additional ventilation device, comprising: A method for selecting an additional ventilator and an air conditioner, wherein an additional ventilator (20) is selected by the selection method according to claim 1, and an air conditioner (30) for air conditioning the indoor space is selected. ,
A first air conditioning load determined based on the size of the indoor space (SI), a second air conditioning load caused by ventilation by the existing first ventilation device, and the additional ventilation selected in the third step a fourth step of determining the sum with the third air conditioning load caused by ventilation by the device as the total air conditioning load;
a fifth step of selecting an air conditioner (30) having an air conditioning capacity capable of processing the total air conditioning load from among a plurality of air conditioner candidates having different air conditioning capacities;
A method for selecting an additional ventilation device and an air conditioner. In the third step, heat exchange to perform heat exchange between outside air (OA) serving as supply air (SA) to the indoor space and return air (RA) serving as exhaust air (EA) from the indoor space a ventilator having a portion (40) as the additional ventilator (20);
In the fourth step, the third air conditioning load is obtained in consideration of the amount of heat exchanged in the heat exchange section (40) of the selected additional ventilation device;
The method for selecting an additional ventilation device and an air conditioner according to claim 2. In the third step, an additional ventilator is selected from among a plurality of ventilator candidates with different maximum ventilation volumes,
The number of the plurality of air conditioner candidates in the fifth step is greater than the number of the plurality of ventilation device candidates in the third step,
The method for selecting an additional ventilation device and an air conditioner according to claim 2 or 3. An air conditioning ventilation system installed in an indoor space having a floor area of 70 m ² or more and 95 m ² or less and an existing first ventilation device having a first ventilation rate per hour,
an air conditioner having a cooling rated capacity of about 12.5 kW;
a ventilator having a maximum ventilation volume of 250 m ³ /h;
Air conditioning ventilation system with. An air conditioning ventilation system installed in an indoor space having a floor area of 40 m ² or more and 60 m ² or less and an existing first ventilation device having a ventilation rate per hour of the first ventilation rate,
an air conditioner having a cooling rated capacity of about 7.1 kW;
a ventilator having a maximum ventilation volume of 150 m ³ /h;
Air conditioning ventilation system with. The air conditioner has an air supply port (33) for receiving supply air (SA) from outside the indoor space,
The ventilator has an air supply fan (26) for sending outside air (OA) to the air conditioner as the supply air (SA),
An air supply path forming member that forms an air supply path (24a) that is connected to the ventilation device and the air conditioner and guides the supply air (SA) from the ventilation device to the air supply port of the air conditioner. (24),
7. The air conditioning and ventilation system of claim 5 or 6, further comprising: The ventilator (20) includes a casing (50) that houses the air supply fan (26), and an exhaust air (EA ), and a heat exchanger (40) for exchanging heat between the return air (RA) that becomes the exhaust (EA) and the outside air (OA),
The casing has a first opening (51) for taking in the air in the indoor space as the return air (RA), and a second opening (51) for sending the return air (RA) out of the indoor space as the exhaust air (EA). An opening (52), a third opening (53) for taking in the outside air (OA), and a fourth opening (54) to which the air supply path forming member is connected are formed,
The pressure of the return air (RA) flowing from the first opening (51) to the second opening (52) in the ventilator and the pressure of the third opening (53) to the fourth opening (54) in the ventilator. A pressure adjustment unit (58) that adjusts the pressure of the air so that the difference between the pressure of the outside air (OA) flowing to the
8. The air conditioning and ventilation system of claim 7, further comprising: a remote controller (90) that controls the air conditioner and the ventilator;
9. The air conditioning and ventilation system of any of claims 5-8, further comprising:

Images