Selection method of additional ventilation device, additional ventilation device, selection method of air conditioning device and air conditioning ventilation system

Abstract

The selection method of the second ventilation device (20) is a selection method of the second ventilation device (20) when other ventilation devices are newly provided as the second ventilation device (20) for an indoor space (SI) in which the existing first ventilation device (10) is provided. The ventilation amount of the existing first ventilation device (10) per 1 hour is a first ventilation amount. In a first step, a second ventilation amount is calculated based on the size of the indoor space. The second ventilation amount is a ventilation amount per 1 hour required as a countermeasure against infection of a pathogen. In a second step, a difference between the second ventilation amount and the first ventilation amount is calculated as an additional ventilation amount. In a third step, a ventilation device capable of ventilation of the additional ventilation amount is selected as the second ventilation device (20).

Description

Technical Field

[0001] The present invention relates to a method for selecting an additional ventilation device, a method for selecting an additional ventilation device and an air conditioning device, and an air conditioning ventilation system. Background Technology

[0002] Ventilation devices that exhaust indoor air to the outside or supply outdoor air to the room have been widely used for a long time (for example, see Patent Document 1 (Japanese Patent Application Publication No. 2005-300112)). Summary of the Invention

[0003] The problem that the invention aims to solve

[0004] Most existing buildings are equipped with ventilation systems to provide a certain degree of ventilation.

[0005] On the other hand, recently, as one of the countermeasures against infection by pathogens such as viruses or bacteria (hereinafter referred to as pathogen infection), it has been required to increase the ventilation volume.

[0006] However, replacing the existing ventilation system would be costly in terms of both equipment cost and installation cost.

[0007] Methods for solving problems

[0008] The method for selecting an additional ventilation device according to the first viewpoint is a method for selecting an additional ventilation device when reinstalling another ventilation device as an additional ventilation device relative to an indoor space where an existing first ventilation device is installed. The air exchange rate of the existing first ventilation device per hour is the first ventilation rate. The method for selecting an additional ventilation device according to the first viewpoint includes a first step, a second step, and a third step. The first step is to calculate a second ventilation rate based on the size of the indoor space. The size of the indoor space can be the floor area, the volume of the indoor space, the number of people the indoor space can accommodate, etc. The second ventilation rate is the air exchange rate per hour required as a countermeasure against pathogen infection. In the second step, the difference between the second ventilation rate and the first ventilation rate is calculated as the additional ventilation rate. In the third step, a ventilation device capable of performing the additional ventilation rate is selected as the additional ventilation device.

[0009] Here, an additional ventilation device is selected based on the previously unseen superior idea of ​​directly utilizing the first ventilation volume of the existing first ventilation device and supplementing the insufficient ventilation volume (additional ventilation volume) by an additional ventilation device. Thus, ventilation of the second volume required as a countermeasure against pathogen infection can be achieved while suppressing costs.

[0010] The second viewpoint's method for selecting the additional ventilation device and air conditioning unit is based on the method used in the first viewpoint, which selects the additional ventilation device and subsequently the air conditioning unit. An air conditioning unit is a device for regulating the air in an indoor space. The second viewpoint's method for selecting the additional ventilation device and air conditioning unit, in addition to the first, second, and third steps, includes a fourth and a fifth step. In the fourth step, the sum of the first, second, and third air conditioning loads is calculated 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 generated by the ventilation of the existing first ventilation device. The third air conditioning load is the air conditioning load generated by the ventilation of the additional ventilation device selected in the third step. In the fifth step, an air conditioning unit with the capacity to handle the total air conditioning load is selected from a pool of candidates with varying air conditioning capacities.

[0011] Based on the existing first ventilation device, if an additional ventilation device is installed relative to the indoor space, it is assumed that the air conditioning load of the indoor space will increase due to the ventilation of the additional ventilation device. If this situation is not considered, there is a possibility that the temperature and heat environment of the indoor space will deteriorate. In view of this situation, in the method for selecting the additional ventilation device and the air conditioning device in the second viewpoint, an air conditioning device can be selected that can handle the total air conditioning load, including the air conditioning load generated by the ventilation of the additional ventilation device.

[0012] The third approach to selecting the additional ventilation device and air conditioning unit, based on the selection method of the second approach, involves selecting a ventilation device with a heat exchange section as the additional ventilation device in the third step. The heat exchange section facilitates heat exchange between external gas (supply gas to the indoor space) and return gas (exhaust gas from the indoor space). Furthermore, in the fourth step, considering the heat exchange capacity of the selected additional ventilation device's heat exchange section, a third air conditioning load is calculated.

[0013] Here, an additional ventilation unit is selected, which includes a heat exchange section that facilitates heat exchange between the supplied and discharged gases. Therefore, the deterioration of the indoor temperature environment caused by the ventilation from the additional ventilation unit can be minimized. Furthermore, since the third air conditioning load is calculated considering the amount of heat exchange in the heat exchange section, the total air conditioning load is not overcalculated. Thus, the required air conditioning capacity can be accurately identified, and an air conditioning unit that is neither excessive nor insufficient can be selected.

[0014] The fourth viewpoint's method for selecting the additional ventilation device and air conditioning unit, based on the second or third viewpoint's selection method, also includes a sixth and a seventh step. In the sixth step, it is determined whether the airflow at the maximum ventilation capacity of the additional ventilation device selected in the third step is less than 30% of the rated airflow of the air conditioning unit selected in the fifth step. In the seventh step, if the sixth step determines that the airflow at the maximum ventilation capacity of the additional ventilation device exceeds 30% of the rated airflow of the air conditioning unit, the selection of the additional ventilation device and air conditioning unit is reconsidered.

[0015] When the airflow of the additional ventilation unit exceeds 30% of the rated airflow of the air conditioning unit, even if the total air conditioning load can be handled by the air conditioning capacity of the air conditioning unit, the operating efficiency of the air conditioning unit will decrease, and the operating cost may be high. Therefore, in the selection method for the additional ventilation unit and air conditioning unit in the fourth viewpoint, steps six and seven are performed to reconsider the selection of the additional ventilation unit and air conditioning unit. As a result, for example, it is possible to select an air conditioning unit with a higher rated airflow and air conditioning capacity, thereby reducing the operating costs of air conditioning and ventilation.

[0016] The method for selecting the additional ventilation device and air conditioning unit in the fifth viewpoint is based on the selection method of any one of the second to fourth viewpoints. In the third step, the additional ventilation device is selected from a pool of candidates with different maximum ventilation capacities. Furthermore, the number of candidates for multiple air conditioning units in the fifth step is greater than the number of candidates for multiple ventilation devices in the third step.

[0017] By preparing a larger pool of candidate air conditioning units, a more suitable unit can be selected based on the chosen additional ventilation system. This helps to reduce the cost of the unit and its installation.

[0018] The sixth point is that the air conditioning ventilation system is installed on a floor area of ​​70m². 2 Above, 95m 2 The following is an indoor space equipped with an existing first ventilation device, wherein the ventilation capacity of the existing first ventilation device is defined as the first ventilation capacity per hour. The air conditioning ventilation system comprises: an air conditioning unit with a rated cooling capacity of approximately 12.5 kW; and a ventilation device with a maximum ventilation capacity of 250 m³ / h. 3 / h.

[0019] If the air conditioning ventilation system is installed in an existing building in an indoor space with a floor area that ensures the first ventilation volume, the ventilation volume required as a countermeasure against pathogen infection can be obtained, and the total air conditioning load of the indoor space, including the air conditioning load resulting from the increased ventilation volume, can be handled by the air conditioning unit.

[0020] The seventh point is that the air conditioning ventilation system is installed on a floor area of ​​40m². 2 Above, 60m 2 The following is an indoor space equipped with an existing first ventilation device, wherein the ventilation capacity of the existing first ventilation device is defined as the first ventilation capacity per hour. The air conditioning ventilation system comprises: an air conditioning unit with a rated cooling capacity of approximately 7.1 kW; and a ventilation device with a maximum ventilation capacity of 150 m³ / h. 3 / h.

[0021] If the air conditioning ventilation system is installed in an existing building in an indoor space with a floor area that ensures the first ventilation volume, the ventilation volume required as a countermeasure against pathogen infection can be obtained, and the total air conditioning load of the indoor space, including the air conditioning load resulting from the increased ventilation volume, can be handled by the air conditioning unit.

[0022] The eighth viewpoint's air conditioning ventilation system, based on the sixth or seventh viewpoint's system, includes an air supply port. This port receives supplied air from outside the indoor space. The ventilation unit also has a supply fan, which is used to deliver outside air as supply gas to the air conditioning unit. Furthermore, the eighth viewpoint's system also includes a supply path forming component. This component connects to both the ventilation unit and the air conditioning unit, forming a supply path. The supply path is the airflow path that guides the supplied gas from the ventilation unit to the air supply port of the air conditioning unit.

[0023] This air conditioning ventilation system encapsulates the ventilation unit, air conditioning unit, and air supply path into a single component. Therefore, compared to using pipes and other components purchased on-site to connect the ventilation unit and air conditioning unit, it can reduce implementation costs, including installation costs. Furthermore, since the supply gas from the ventilation unit is received by the air conditioning unit, the temperature of the supply gas can be adjusted within the air conditioning unit before being supplied to the indoor space.

[0024] The ninth viewpoint's air conditioning ventilation system, based on the eighth viewpoint's system, further includes a housing, an exhaust fan, and a heat exchanger. The housing houses the supply fan and the exhaust fan. The exhaust fan is used to expel indoor air as exhaust gas to the outside of the indoor space. The heat exchanger allows heat exchange between the outside gas and the return gas, which becomes exhaust gas. The housing has a first opening, a second opening, a third opening, and a fourth opening. The third opening is for taking in outside gas. The fourth opening is connected to the air supply path forming component. The first opening is for taking in indoor air as return gas. The second opening is for expelling the return gas as exhaust gas to the outside of the indoor space. Furthermore, the ninth viewpoint's air conditioning ventilation system also includes a pressure regulating unit. The pressure regulating unit adjusts the air pressure in such a way that the pressure difference between the return gas flowing from the first opening to the second opening in the ventilation device and the outside gas flowing from the third opening to the fourth opening in the ventilation device decreases.

[0025] Here, when the exhaust fan is operating, indoor air is drawn into the casing as return air through the first opening and discharged outside the indoor space as exhaust air through the second opening. Conversely, when the supply fan is operating, outside air is drawn into the casing through the third opening, flows from the third opening to the fourth opening, and is supplied to the air conditioning unit via the supply air path from the fourth opening. The return air drawn into the casing through the first opening and the outside air drawn into the casing through the third opening exchange heat in a heat exchanger. This effectively suppresses the increase in air conditioning load on the indoor space caused by ventilation.

[0026] Furthermore, the air conditioning ventilation system of the ninth viewpoint includes a pressure regulating unit to reduce the pressure difference between the external gas undergoing heat exchange and the return gas. This helps to suppress undesirable situations such as the mixing of external and return gases in heat exchangers and similar equipment.

[0027] The tenth viewpoint's air conditioning ventilation system, based on the air conditioning systems described in any of the sixth to ninth viewpoints, also includes a remote control for controlling the air conditioning unit and the ventilation unit.

[0028] Here, for example, a remote control can be used to link the operation / stop of the air conditioning unit and the ventilation unit, or to control the air conditioning unit to not perform ventilation based on the ventilation unit when it is not working. Attached Figure Description

[0029] Figure 1A It is a state diagram of a building equipped with a first ventilation device and an air conditioning ventilation system.

[0030] Figure 1B This is a diagram of the building before the second ventilation system was installed.

[0031] Figure 2 It is a three-dimensional diagram for assembling the indoor unit of an air conditioner, the gas intake components installed on the indoor unit, and the gas supply pipes.

[0032] Figure 3 This is a control block diagram of the air conditioning ventilation system.

[0033] Figure 4A This is a diagram showing the indoor ventilation status based on the first ventilation device before the second ventilation device is installed.

[0034] Figure 4B This diagram illustrates the indoor ventilation state when windows are opened to increase ventilation without installing a second ventilation device.

[0035] Figure 4C This diagram shows the indoor ventilation status when a second ventilation device is added.

[0036] Figure 5 This is a table representing various numerical values ​​for combinations of candidates for the second ventilation device and the candidate indoor air conditioning unit. Detailed Implementation

[0037] (1) Overall structure of the first ventilation device and the air conditioning ventilation system

[0038] Figure 1A This indicates the installation status of the first ventilation device 10 and the air conditioning ventilation system 100 in building H. The first ventilation device 10 and the air conditioning ventilation system 100 are installed for a specified indoor space S1 in building H. The air conditioning ventilation system 100 mainly includes a second ventilation device 20, an indoor air conditioning unit 30, ducts 21 to 24, and a remote control 90.

[0039] The first ventilation device 10 is a ventilation device that has been installed for the indoor space SI before the second ventilation device 20 is installed.

[0040] The indoor unit 30 of the air conditioning ventilation system 100 is also a device that was installed for the indoor space SI before the second ventilation device 20 was installed.

[0041] Figure 1B This indicates the state of building H before the installation of the second ventilation device 20.

[0042] The second ventilation device 20 and pipes 21-24 of the air conditioning ventilation system 100 are added to the indoor space SI that already has the first ventilation device 10 and the indoor air conditioning unit 30.

[0043] In this embodiment, it is assumed that Figure 1A and Figure 1BThe first ventilation device 10 and the indoor air conditioning unit 30 shown are already installed devices. Figure 1A The second ventilation device 20 and pipes 21-24 shown are described as devices currently installed during the design and research phase.

[0044] (2) Details of the first ventilation device

[0045] The first ventilation device 10 is a ventilation fan with a propeller fan or a ventilation device with a Sirocco fan. Figure 1A , Figure 1B The first ventilation device 10 shown draws in indoor air from the indoor space S1 and discharges it to the outside of the building H (outdoor space S0). The intake port of the first ventilation device 10 is connected to a first return air port 16 located on the ceiling of the indoor space S1. The supply air port of the first ventilation device 10 is connected to a first exhaust port 18 located on the exterior wall of the building H. The first ventilation device 10 is, for example, 500m... 3 / h ventilation rate.

[0046] (3) Details of the indoor unit of the air conditioner

[0047] The indoor air conditioning unit 30, together with the outdoor air conditioning unit (not shown) installed on the roof or exterior of building H, constitutes an air conditioning system. The air conditioning system is a device that cools or heats the indoor space SI through a vapor compression refrigeration cycle. For example... Figure 1A or Figure 1B As shown, the indoor unit 30 of the air conditioner includes a heat exchanger 37 that constitutes a refrigeration cycle, an indoor fan 35 for conveying indoor air to the heat exchanger 37 and returning it to the indoor space SI, etc. The casing of the indoor unit 30 is rectangular when viewed from above, with an intake 31 formed in the center of its lower surface and exhaust vents 32 formed along the four sides of the lower surface. Indoor air is drawn in through the intake 31 (see reference). Figure 1A (arrow Ain), the air after air conditioning returns to the indoor space SI from the outlet 32 ​​(refer to) Figure 1A (arrow Aout).

[0048] In addition, Figure 1A The indoor unit 30 of the air conditioner shown is equipped with Figure 2 The gas intake component 30a shown is an optional device. The gas intake component 30a is a component that forms a flow path for air flow. Air entering from the inlet 33 of the gas intake component 30a flows out near the suction port 31 of the casing of the indoor unit 30 of the air conditioner.

[0049] (4) Details of the second ventilation device and its piping, which together with the indoor unit of the air conditioner constitute the air conditioning ventilation system.

[0050] The second ventilation device 20 is disposed in the space SC behind the ceiling of the indoor space SI of building H, and while ventilating the indoor space SI, it enables heat exchange between the external gas OA, which becomes the supply gas SA, and the return gas RA, which becomes the exhaust gas EA.

[0051] Pipes 21 to 24 are return gas pipe 21, exhaust pipe 22, external gas inlet pipe 23, and gas supply pipe 24.

[0052] The second ventilation device 20 includes a housing 50, a supply fan 26, an exhaust fan 28, a heat exchange element 40 in a generally quadrangular prism shape, and a ventilation control unit 70.

[0053] The housing 50 internally houses the heat exchange element 40, the air supply fan 26, the exhaust fan 28, etc. In addition, the housing 50 has a first opening 51 connected to the return gas pipe 21, a second opening 52 connected to the exhaust pipe 22, a third opening 53 connected to the external gas inlet pipe 23, and a fourth opening 54 connected to the air supply pipe 24.

[0054] Inside the housing 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 space 53a between the third opening 53 and the heat exchange element 40, and a fourth space 54a between the fourth opening 54 and the heat exchange element 40.

[0055] An air supply fan 26 is located in the fourth space 54a and has an air supply fan motor 26m. An exhaust fan 28 is located in the second space 52a and has an exhaust fan motor 28m.

[0056] The return gas duct 21 connects the first opening 51 of the second ventilation device 20 and the second return gas port 81 located on the ceiling of the indoor space SI, forming a return gas path 21a for the flow of return gas RA.

[0057] The exhaust pipe 22 connects the second opening 52 of the second ventilation device 20 and the second exhaust port 82 opened on the outer wall of the building H, forming an exhaust path 22a for the flow of exhaust gas EA.

[0058] The external gas inlet pipe 23 connects the third opening 53 of the second ventilation device 20 and the external gas inlet 83 opened on the outer wall of the building H, forming an external gas inlet path 23a for the flow of external gas OA.

[0059] The gas supply pipe 24 connects to the fourth opening 54 of the second ventilation device 20 and the inlet 33 of the gas supply intake component 30a additionally installed in the indoor unit of the air conditioner 30, forming a gas supply path 24a for the flow of supply gas SA. The gas supply pipe 24 is divided into two branches and connected to two inlets 33. By dividing it into two branches, the air passage area can be increased, and the pressure loss in the gas supply pipe can be reduced.

[0060] like Figure 3 As shown, the ventilation control unit 70 is connected to the air supply fan motor 26m, the exhaust fan motor 28m, the remote controller 90, etc. The ventilation control unit 70 is implemented by a computer. The ventilation control unit 70 includes a control processing unit and a storage unit. The control processing unit can use a processor such as a CPU or GPU. The control processing unit reads the program stored in the storage unit and performs prescribed image processing or computational processing according to the program. Furthermore, the control processing unit can write the computational results to the storage unit or read the information stored in the storage unit according to the program. Based on instructions from the remote controller 90 (described later), the ventilation control unit 70 switches the air supply fan 26m and the exhaust fan 28m on and off.

[0061] Additionally, while illustrations and explanations are omitted here, the external gas temperature sensor and the indoor temperature sensor can be connected to the ventilation control unit 70, and the sensor values ​​can be used for control.

[0062] (5) Details of the remote control

[0063] The remote control 90 allows the user in the indoor space SI to perform various settings operations on the indoor air conditioning unit 30 and the second ventilation device 20. The remote control 90, like the ventilation control unit 70, is also implemented by a computer.

[0064] The remote control 90, the ventilation control unit 70, and the control unit (not shown) of the indoor air conditioning unit 30 are connected via a communication line.

[0065] (6) Details of the air exchange system of the air conditioning ventilation system

[0066] When the indoor fan 35 of the indoor unit 30 of the air conditioner is working, the remote control 90 activates the second ventilation device 20. In other words, when the second ventilation device 20 needs to be activated, the remote control 90 also activates the indoor unit 30. When the supply fan 26 and exhaust fan 28 of the second ventilation device 20 are working, the external air OA of the outdoor space SO reaches the heat exchange element 40 through the external air inlet 23a. After passing through the heat exchange element 40, the air is supplied to the indoor space SI as fresh supply air SA by the supply fan 26. The indoor air of the indoor space SI reaches the heat exchange element 40 as return air RA through the return air outlet 21a. After passing through the heat exchange element 40, the air is discharged to the outdoor space SO as exhaust air EA by the exhaust fan 28.

[0067] In the heat exchange element 40, heat exchange occurs between the external gas OA and the return gas RA, suppressing the increase in air conditioning load caused by the ventilation accompanying the second ventilation device 20.

[0068] (7) Selection method for a second ventilation device installed to increase the ventilation volume of the indoor space and selection method for the indoor unit of the air conditioner.

[0069] For example Figure 1B The indoor space SI of building H, shown here, which is already equipped with a first ventilation device 10 and an indoor air conditioning unit 30, requires increased ventilation as one of the countermeasures against infection by pathogens such as viruses or bacteria. For example, assuming 20m³ per person... 3 The ventilation rate is determined by the design of the ventilation rate of the first ventilation device 10, but a further requirement of 10m³ / h is required. 3 / h, Total 30m 3 The ventilation rate is set at / h. In other words, it is required that the current ventilation rate be set to 1.5 times. In this case, the additional second ventilation device 20 is selected through the following steps.

[0070] (7-1) Selection method for the second ventilation device

[0071] First, in the first step, the required second ventilation volume for the additional second ventilation device 20 is determined 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 required ventilation volume in the indoor space SI based on the maximum number of people. Specifically, the required ventilation volume in the indoor space SI is the following value: the floor area of ​​the indoor space SI (m²) 2 Divide by the area per person (m²) determined by the use of the interior space SI (room) (generally a shop, office, etc.). 2 The resulting value is multiplied by the required ventilation rate per person per hour (m³). 3 / h). The dedicated area per person (m²) determined by the purpose of the interior space SI. 2 For example, the value is determined by the intended use and is 3m. 2 5m 2 etc. The volume (m³) of the interior space SI can also be used. 3 The necessary air exchange rate is calculated based on the required number of air changes in the room.

[0072] First ventilation volume (m³) 3 / h) For example, the ventilation rate required for an indoor space SI based on human carbon dioxide emissions. Second ventilation rate (m 3The second ventilation rate (m³ / h) is the air exchange rate (SI) required per hour for an indoor space as a countermeasure against pathogen infection. Pathogens targeted by these countermeasures include viruses or bacteria such as influenza virus, norovirus, coronavirus, and tuberculosis. 3 / h) is higher than the first ventilation rate (m 3 / h) large values.

[0073] Next, in the second step, the difference between the second ventilation rate and the first ventilation rate is calculated as the additional ventilation rate (m). 3 / h). First ventilation rate (m³) 3 / h) is the air exchange rate of the first ventilation device 10 that has been installed for the indoor space SI.

[0074] Next, in the third step, a ventilation device capable of performing additional ventilation is selected as the additional second ventilation device 20. In the third step, the second ventilation device 20 is selected from the candidates V1 to V6 of the ventilation devices shown in (7-2) below.

[0075] (7-2) Candidates V1 to V6 for the ventilation system

[0076] The candidate ventilation device is one with a ventilation capacity of 150m³. 3 Ventilation device V1 with a ventilation capacity of 250m³ / h 3 V2 ventilation device with a ventilation capacity of 350m³ / h 3 V3 ventilation device with a ventilation capacity of 500m³ / h 3 V4 ventilation device with a ventilation capacity of 650m³ / h 3 The ventilation device V5 has a ventilation capacity of 800 m³ / h. 3 / h ventilation device V6.

[0077] (7-3) Method for selecting indoor air conditioning units

[0078] After the selection of the second ventilation device 20 in the third step is completed, the process moves 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 calculated as the total air conditioning load. The first air conditioning load is the air conditioning load determined based on the size of the indoor space SI, and is calculated by summing the heat load of people and equipment located indoors, solar heat entering through windows and walls, and heat load based on the temperature difference between inside and outside. The air conditioning load (first air conditioning load) per unit area for cooling and heating is known depending on the purpose of the indoor space SI (rooms) of building H (generally shops, office buildings, etc.). The second air conditioning load is the air conditioning load generated by the ventilation of the existing first ventilation device 10. When ventilation is performed, external air is taken into the indoor space SI through pipes, door gaps, etc., and a load is generated in order to maintain the temperature and humidity of the external air at the indoor level. This external air load is the second air conditioning load generated by ventilation. The third air conditioning load is the air conditioning load generated by the ventilation of the second ventilation device 20 selected in the third step.

[0079] Furthermore, in the fourth step, the third air conditioning load is calculated by considering the amount of heat exchange between the external gas OA and the return gas RA in the heat exchange element 40 of the second ventilation device 20. The heat exchange element 40 is installed to recover the total heat (sensible heat and latent heat) of the air conditioning energy lost due to ventilation, and its recovery amount is considered in the fourth step.

[0080] In the fifth step, an air conditioning indoor unit 30 with the air conditioning capacity to handle the total air conditioning load is selected from a pool of candidates with different air conditioning capacities. Here, air conditioning indoor unit 30 is selected from candidates A1 to A9 shown in (7-4) below.

[0081] (7-4) Candidates for indoor air conditioning units: A1~A9

[0082] The candidate for the indoor unit of the air conditioner, relative to the indoor space SI used in general shops, is suitable for 22-25m². 2 A 1.5 horsepower (3.6kW) air conditioner indoor unit A1, suitable for 25-28m² floor area. 2 A 1.8 hp (4.0 kW) air conditioning indoor unit A2, suitable for 28-31 square meters of floor space. 2 A 2-horsepower (4.5kW) indoor air conditioning unit A3, suitable for 31-35m² floor area. 2 A 2.3 hp (5.0 kW) air conditioning indoor unit A4, suitable for areas of 35-39 square meters. 2 The 2.5 horsepower (5.6kW) A5 indoor air conditioning unit is suitable for areas with a floor area of ​​44-50 square meters. 2A 3-horsepower (7.1kW) indoor air conditioning unit A6, suitable for 62-70m² floor area. 2 A7 air conditioning indoor unit with a floor area of ​​4 horsepower (10.0kW), suitable for 78-88m². 2 The A8 air conditioning indoor unit has a floor area of ​​5 horsepower (12.5kW) and is suitable for 89-100m². 2 The floor area is occupied by a 6-horsepower (14.0 kW) indoor air conditioning unit A9. The number of candidates for this indoor air conditioning unit A1 to A9 is greater than the number of candidates for the aforementioned ventilation devices V1 to V6.

[0083] (7-5) Reconsideration of the selection of the second ventilation device and the indoor unit of the air conditioner

[0084] In the sixth step, it is determined whether the air volume at the maximum air exchange rate of the second ventilation device 20 selected in the third step is less than 30% of the rated air volume of the indoor air conditioning unit 30 selected in the fifth step.

[0085] Next, in the seventh step, if the airflow at which the maximum air exchange capacity of the second ventilation device 20 is determined in the sixth step exceeds 30% of the rated airflow of the indoor unit 30, the selection of the second ventilation device and the indoor unit is reconsidered. In this reconsideration, the indoor unit 30 is reselected from candidates with a larger rated airflow, or the second ventilation device 20 is reselected from candidates with a smaller maximum air exchange capacity.

[0086] (7-6) Selected Specific Examples

[0087] Next, refer to Figures 4A to 4C A specific example of the selection of the second ventilation device 20 when a second ventilation device 20 is added to increase the ventilation volume of the indoor space SI of a building H that already has a first ventilation device 10 is explained.

[0088] like Figure 4A As shown, suppose that a 5-horsepower (5HP) indoor air conditioning unit 30 and an air exchange rate of 500m³ are installed in the indoor space SI of a store. 3 The first ventilation device 10 is installed at a rate of / h. The dedicated area per person (m²) is determined based on the purpose of the indoor space SI. 2 In a typical store, it is 3m 2 The floor area of ​​the indoor space SI is 75m². 2 The indoor space SI of the store, which has a capacity of 25 people, used to be 20m² per person. 3 When designing for a ventilation rate of / h, a ventilation rate of 500m³ / h is specified. 3The first ventilation unit 10 has a capacity of 12.5kW, which is equivalent to a 5-horsepower indoor air conditioning unit 30, and can cover a floor area of ​​83m². 3 Indoor air conditioning. On the other hand, with a current air exchange rate of 500m³ / h... 3 In the case of / h, for a typical store with a floor area of ​​75m² 2 The required air conditioning capacity for the interior space SI is 11.3 kW. Therefore, relative to the current floor area of ​​the interior space SI (75 m²), the required air conditioning capacity is... 2 The 5-horsepower indoor air conditioning unit 30 has approximately 10% spare capacity.

[0089] As a countermeasure against pathogen infection, the store is considering increasing the current ventilation rate (20m³ per person). 3 / h), ensuring a total of 30m² for indoor space SI. 3 If an air exchange rate of / h (per person) is ensured, opening windows for ventilation is a simple method to be considered.

[0090] When ventilating by opening windows, such as Figure 4B As shown, the window needs to be opened and 250m 3 External air is drawn into the indoor space SI at a rate of / h. However, opening windows leads to increased noise, insect intrusion into the indoor space SI, and uneven temperature distribution, all of which negatively impact customer comfort. Furthermore, the increased air conditioning load due to the introduction of external air, for example, when the outside temperature is 35°C and the indoor temperature is 27°C, results in an increase of 1.5kW in the external air load, which is significant for a floor area of ​​75m² in the indoor space SI. 2 The store requires 12.8kW (=11.3kW+1.5kW) of air conditioning capacity. In contrast, the existing 5-horsepower indoor air conditioning unit 30 has insufficient air conditioning capacity (12.5kW). Therefore, the store that needs to open windows for ventilation must remove the 5-horsepower indoor air conditioning unit 30 and install a new 6-horsepower (14.0kW) indoor air conditioning unit.

[0091] In contrast, as a result of ensuring a total of 30m² of interior space SI. 3 If the selected method shown in (7-1) to (7-5) above is adopted, the ventilation volume of the indoor space SI and the air conditioning load can be ensured while suppressing the initial cost and operating cost.

[0092] Using the selected method described above, first in step 1, based on the size of the indoor space SI (floor area 75m²)... 2 Given a capacity of 25 people, calculate the second ventilation volume required for the indoor space SI as a countermeasure against pathogen infection. As a countermeasure against pathogen infection, 30m³ / person is required here.3 / h, the second ventilation volume is 750m 3 / h(25×30m 3 Calculate / h).

[0093] Next, in the second step, the difference between the second ventilation rate and the first ventilation rate is calculated as the additional ventilation rate (m). 3 / h). The additional ventilation volume is determined to be 250m³. 3 / h (Second ventilation volume 750m³) 3 / h - First ventilation capacity of the first ventilation device 10: 500m³ 3 / h).

[0094] Next, in the third step, a ventilation device capable of performing additional ventilation is selected from the candidate ventilation devices V1 to V6, and this device is selected as the second ventilation device 20. Here, the ventilation capacity is set to 250m³. 3 The ventilation device V2 with a capacity of / h was selected as the second ventilation device 20.

[0095] Next, in the fourth step, the sum of the first air conditioning load, the second air conditioning load, and the third air conditioning load is calculated as the total air conditioning load. As mentioned above, the second air conditioning load is the air conditioning load generated by the existing first ventilation device 10. The ventilation performed by the existing first ventilation device 10 (ventilation volume 500m³) 3 The combined second and first air conditioning loads generated by / h amount to 75m² of floor space in a typical store. 2 In the case of an indoor space SI, the aforementioned 11.3kW is applied. The third air conditioning load is an additional air conditioning load generated due to the additional installation of the second ventilation unit 20, which accompanies the operation of the second ventilation unit 20. The selected second ventilation unit 20 has a ventilation capacity of 250m³. 3 With ventilation unit V2 operating at 1 / h, the additional air conditioning load (third air conditioning load) is 0.6kW when the outside temperature is 35°C and the indoor temperature is 27°C. Under the same conditions, the load is 1.5kW when ventilation is achieved by opening windows. However, with the second ventilation unit 20, due to total heat exchange in the heat exchange element 40, the additional air conditioning load is 0.6kW. Therefore, the total air conditioning load is 11.9kW (11.3kW + 0.6kW).

[0096] For reference only. Figure 5 The additional air conditioning load and other values ​​for each combination of the candidate second ventilation device 20 and the candidate air conditioning indoor unit 30 are shown.

[0097] Next, in the fifth step, an indoor air conditioning unit 30 with the air conditioning capacity to handle the total air conditioning load is selected from the candidates A1 to A9. Here, the indoor air conditioning unit A8, which is already configured for the indoor space SI with a power of 5 horsepower (12.5 kW), is selected as the indoor air conditioning unit 30. This is because it can handle the total air conditioning load (11.9 kW) with 5 horsepower (12.5 kW).

[0098] Next, in the sixth step, it is determined whether the airflow at the maximum air exchange rate of the second ventilation device 20 selected in the third step is less than 30% of the rated airflow of the indoor air conditioning unit 30 selected in the fifth step. Here, the airflow at the maximum air exchange rate of the second ventilation device 20 is less than 30% of the rated airflow of the indoor air conditioning unit 30. Therefore, the selection of the second ventilation device and the indoor air conditioning unit in the seventh step is not reconsidered.

[0099] Thus, here, as Figure 4C As shown, a second ventilation device 20 with a heat exchange element 40 for total heat exchange is added, and the air conditioning ventilation system 100 is formed by the second ventilation device 20 and the existing 5-horsepower air conditioning indoor unit 30.

[0100] In addition, as mentioned above, when ventilation is adopted as a countermeasure against pathogen infection, the 5-horsepower air conditioner indoor unit 30 must be removed and a 6-horsepower (14.0kW) air conditioner indoor unit must be installed. However, if a second ventilation device 20 with a heat exchange element 40 for total heat exchange is added, the existing 5-horsepower air conditioner indoor unit 30 can be used directly.

[0101] (8) Features of the selection method for the second ventilation device

[0102] (8-1)

[0103] According to the selection method of the second ventilation device described in (7) above, the second ventilation device 20 was selected based on the superior idea of ​​directly utilizing the first ventilation volume of the existing first ventilation device 10 and supplementing the insufficient additional ventilation volume through the second ventilation device 20, which is not seen in the past. As a result, ventilation of the second ventilation volume required as a countermeasure against pathogen infection can be achieved while suppressing costs.

[0104] (8-2)

[0105] In the case where a second ventilation device 20 is added to the existing first ventilation device 10 for the indoor space SI, it is assumed that the air conditioning load of the indoor space SI will increase due to the ventilation of the second ventilation device 20. If this situation is not considered, the temperature and heat environment of the indoor space SI may deteriorate. In view of this, in the above-described method for selecting the second ventilation device 20 and the air conditioning indoor unit 30, an air conditioning indoor unit 30 capable of handling the total air conditioning load, including the air conditioning load generated by ventilation, is selected. Thus, it can be determined whether the air conditioning indoor unit 30 already installed in the indoor space SI can be used directly, or whether it is necessary to replace it with a new air conditioning indoor unit 30 with a higher air conditioning capacity.

[0106] (8-3)

[0107] In the method for selecting the second ventilation device described in (7) above, the second ventilation device 20, which has a heat exchange element 40 that allows heat exchange between the supply gas SA and the exhaust gas EA, is selected as an additional ventilation device. Therefore, the deterioration of the temperature and heat environment of the indoor space SI caused by the ventilation of the second ventilation device 20 can be minimized. Moreover, since the third air conditioning load (the air conditioning load generated by the additional ventilation) is calculated by considering the amount of heat exchange in the heat exchange element 40, the total air conditioning load is not over-calculated. Thus, the required air conditioning capacity is correctly identified, and the indoor air conditioning unit 30 is selected without excess or deficiency.

[0108] (8-4)

[0109] When the airflow of the second ventilation device 20, added as a countermeasure against pathogen infection, exceeds 30% of the rated airflow of the indoor air conditioning unit 30, the operating efficiency of the air conditioning unit will decrease and operating costs may be high, even if the total air conditioning load can be handled by the air conditioning capacity of the indoor air conditioning unit 30. Therefore, in the selection method of the second ventilation device and the indoor air conditioning unit in this embodiment, steps six and seven are performed to reconsider the selection of the second ventilation device and the indoor air conditioning unit. As a result, for example, an indoor air conditioning unit with a higher rated airflow and air conditioning capacity can be selected, thereby reducing the operating costs of air conditioning and ventilation.

[0110] (8-5)

[0111] In the above embodiment, by preparing a larger number of candidate air conditioning indoor units as shown in (7-4), a more suitable air conditioning indoor unit 30 can be selected based on the selected second ventilation device 20. This helps to reduce the operating and installation costs of the air conditioning ventilation system 100.

[0112] (9) Deformation and characteristics of air conditioning ventilation systems

[0113] (9-1)

[0114] In the air conditioning ventilation system 100 described in (1) to (6) above, the case where the air conditioning indoor unit 30 is an already installed device has been explained. However, as an air conditioning ventilation system 100, the second ventilation device 20, the air conditioning indoor unit 30, and the air supply pipe 24 forming the flow path of the supply gas SA, etc., can also be encapsulated. When the fan of the second ventilation device 20 is running at a specified speed, the pipes 21 to 24 connected to the second ventilation device in such a way that the air volume supplied to the room is the target ventilation air volume, and the supply gas intake component 30a (described later), are configured to have a certain flow path resistance. Encapsulation means that the desired flow path resistance can be generated simply by connecting the pipes 21 to 24 with flow path resistance and the supply gas intake component 30a to the air conditioning indoor unit 30 and the second ventilation device 20. As a result, the target ventilation air volume can be supplied without calculating the flow path resistance on site. If an encapsulated air conditioning ventilation system 100 is used, the implementation costs, including the cost of installation work, can be reduced compared to using pipes and other components purchased on-site to connect the indoor unit of the ventilation unit and the air conditioning unit.

[0115] (9-2)

[0116] In addition, in the air conditioning ventilation system 100, the supply gas SA from the second ventilation device 20 enters the air conditioning indoor unit 30. Therefore, the temperature or humidity of the supply gas SA can be adjusted by the air conditioning indoor unit 30 before it is supplied to the indoor space SI.

[0117] (9-3)

[0118] The air conditioning ventilation system 100 includes a remote control 90 for controlling the indoor unit 30 and the second ventilation device 20. This allows the operation / stop of the indoor unit 30 and the second ventilation device 20 to be linked, or to be controlled so that ventilation by the second ventilation device 20 is not performed when the indoor unit 30 is not operating.

[0119] Furthermore, in the air conditioning ventilation system 100, if the second ventilation device 20 is used for ventilation when the indoor unit 30 is not operating, dust adhering to the intake filter of the indoor unit 30 may fall into the indoor space SI, which is an undesirable situation. This undesirable situation can be prevented by setting the remote control 90 and by the linkage control between the indoor unit 30 and the second ventilation device 20.

[0120] (10) Specific examples of air conditioning ventilation systems

[0121] (10-1)

[0122] In the specific example of the selection of the second ventilation device in (7-6) above, the following situation is explained: Suppose that in the indoor space SI (floor area 75m²) of a certain store... 2 It is equipped with a 5-horsepower (5HP) indoor air conditioning unit 30 and an air exchange capacity of 500m³. 3 The first ventilation device 10, operating at a rate of / h, serves as a countermeasure against pathogen infection, increasing the current ventilation rate (20m³ / h per person). 3 / h), for indoor spaces SI ensures a total of 30m² per person. 3 / h ventilation rate.

[0123] If the selection is made using the same idea as in this specific example, it would be set at a floor area of ​​70m². 2 Above and 95m 2 The air conditioning ventilation system for the following indoor space preferably includes: an indoor air conditioning unit with a rated cooling capacity of approximately 12.5 kW; and a second ventilation device with a maximum ventilation capacity of 250 m³ / h. 3 / h.

[0124] If the air conditioning ventilation system is installed in an existing building to ensure the aforementioned floor area of ​​the indoor space with a first ventilation volume (e.g., twice the maximum ventilation volume of the second ventilation device), the ventilation volume required as a countermeasure against pathogen infection can be obtained, and the total air conditioning load of the indoor space, including the air conditioning load resulting from the increased ventilation volume, can be handled by the air conditioning unit.

[0125] (10-2)

[0126] In the specific example of the selection of the second ventilation device in (7-6) above, the following situation is explained: Suppose that in the indoor space SI (floor area 75m²) of a certain store... 2 It is equipped with a 5-horsepower (5HP) indoor air conditioning unit 30 and an air exchange capacity of 500m³. 3 The first ventilation device 10, operating at a rate of / h, serves as a countermeasure against pathogen infection, increasing the current ventilation rate (20m³ / h per person). 3 / h), for indoor spaces SI ensures a total of 30m² per person. 3 / h ventilation rate.

[0127] If the selection is made using the same idea as in this specific example, it would be set at a floor area of ​​40m². 2 Above and 60m 2 The air conditioning ventilation system for the following indoor space preferably includes: an indoor air conditioning unit with a rated cooling capacity of approximately 7.1 kW; and a second ventilation device with a maximum ventilation volume of 150 m³ / h. 3 / h.

[0128] If the air conditioning ventilation system is installed in an existing building to ensure the aforementioned floor area of ​​the indoor space with a first ventilation volume (e.g., twice the maximum ventilation volume of the second ventilation device), the ventilation volume required as a countermeasure against pathogen infection can be obtained, and the total air conditioning load of the indoor space, including the air conditioning load resulting from the increased ventilation volume, can be handled by the air conditioning unit.

[0129] (11) Variation

[0130] (11-1)

[0131] In the air conditioning ventilation system 100 of the above embodiment, indoor air from the indoor space S1 arrives at the heat exchange element 40 as return gas RA via the return gas path 21a. After passing through the heat exchange element 40, the air is discharged to the outdoor space S1 as exhaust gas EA via the exhaust fan 28. On the other hand, outdoor air S100's outdoor air OA arrives at the heat exchange element 40 via the outdoor gas inlet path 23a. After passing through the heat exchange element 40, the air is supplied to the indoor space S1 as fresh supply gas SA via the supply fan 26. However, a certain degree of static pressure is required for the supply gas SA to pass through the narrow flow path in the indoor unit 30 of the air conditioner, which is equipped with the supply gas inlet component 30a. Therefore, a pressure difference may occur between the flow path of the return gas RA and exhaust gas EA, which has low flow resistance, and the flow path of the outdoor gas OA and supply gas SA, which has high flow resistance.

[0132] Therefore, when the pressure loss of the supplied gas SA becomes quite large, it is preferable to add a pressure regulating unit to the air conditioning ventilation system 100.

[0133] For example, as a pressure regulating unit, in Figure 1A The first space 51a of the second ventilation device 20 is equipped with pressure-reducing components 58 such as baffles and dampers to increase the flow resistance of the return gas RA and the exhaust gas EA. As a result, the pressure difference mentioned above is reduced, and the undesirable situation of mixing of external gas and return gas is almost eliminated in the heat exchange element 40.

[0134] (11-2)

[0135] The embodiments of the present invention have been described above, but it should be understood that various changes in manner and details can be made without departing from the spirit and scope of the present disclosure as set forth in the claims.

[0136] Label Explanation

[0137] 10 First ventilation device

[0138] 20. Second ventilation device (ventilation device, additional ventilation device)

[0139] 24 Gas supply line forming components

[0140] 24a gas supply line

[0141] 26 air supply fans

[0142] 28 exhaust fans

[0143] 30. Air conditioner indoor unit (air conditioning unit)

[0144] 30a Gas Supply Intake Unit

[0145] 33. Inlet (gas supply port) of the gas intake component.

[0146] 40 heat exchange elements

[0147] 50 casing

[0148] 51 First Opening

[0149] 52 Second opening

[0150] 53 Third opening

[0151] 54 Fourth Opening

[0152] 58 Pressure reducing component (pressure adjustment unit)

[0153] 90 Remote Control (Controller)

[0154] 100 Air Conditioning and Ventilation System

[0155] EA exhaust gas

[0156] OA external gas

[0157] RA return gas

[0158] SA supplies gas

[0159] SI Indoor Space

[0160] SO outdoor space (outside of indoor space)

[0161] Existing technical documents

[0162] Patent documents

[0163] Patent Document 1: Japanese Patent Application Publication No. 2005-300112

Claims

1. A method for selecting an additional ventilation device and an air conditioning device, wherein an additional ventilation device (20) is selected by means of selecting other ventilation devices as additional ventilation devices when they are re-installed as an additional ventilation device (20) relative to an indoor space (SI) where an existing first ventilation device (10) is installed, and an air conditioning device (30) for conditioning the indoor space is selected, wherein the air exchange rate of the existing first ventilation device (10) per hour is a first air exchange rate, wherein, The method for selecting the additional ventilation device and air conditioning device includes: The first step is to determine the second ventilation rate based on the size of the indoor space (SI), which is the ventilation rate required per hour as a countermeasure against pathogen infection. The second step is to calculate the difference between the second ventilation volume and the first ventilation volume as the additional ventilation volume. The third step is to select the additional ventilation device (20) as the ventilation device capable of performing the additional ventilation volume, and to select the additional ventilation device from a number of candidates with different maximum ventilation volumes and to add it to the indoor space (SI). The fourth step is to calculate the sum of the first air conditioning load determined based on the size of the indoor space (SI), the second air conditioning load generated by the ventilation of the existing first ventilation device, and the third air conditioning load generated by the ventilation of the additional ventilation device selected in the third step, as the total air conditioning load. as well as The fifth step is to select an air conditioning unit (30) with the air conditioning capacity to handle the total air conditioning load from a pool of candidates with different air conditioning capacities and install it in the indoor space (SI).

2. The method for selecting the additional ventilation device and air conditioning device according to claim 1, wherein, In the third step, a ventilation device having a heat exchange element (40) is selected as the additional ventilation device (20), the heat exchange element (40) enabling heat exchange between the external gas (OA) that becomes the supply gas (SA) to the indoor space and the return gas (RA) that becomes the exhaust gas (EA) from the indoor space. In the fourth step, the third air conditioning load is determined by taking into account the heat exchange amount in the heat exchange element (40) of the selected additional ventilation device.

3. The method for selecting the additional ventilation device and air conditioning device according to claim 1 or 2, wherein, The method for selecting the additional ventilation device and air conditioning device also includes: The sixth step is to determine whether the air volume at the maximum air exchange rate of the additional ventilation device selected in the third step is less than 30% of the rated air volume of the air conditioning unit selected in the fifth step; and The seventh step involves reconsidering the selection of the additional ventilation device and the air conditioning unit if, in the sixth step, the air volume at the maximum ventilation capacity of the additional ventilation device exceeds 30% of the rated air volume of the air conditioning unit.

4. The method for selecting the additional ventilation device and air conditioning device according to claim 1 or 2, wherein, The number of candidates for the plurality of air conditioning devices in the fifth step is greater than the number of candidates for the plurality of ventilation devices in the third step.

5. An air conditioning ventilation system, installed on a floor area of ​​70m² 2 Above, 95m 2 The following is an indoor space equipped with an existing first ventilation device (10), wherein the ventilation rate of the existing first ventilation device (10) per hour is the first ventilation rate, wherein, The additional ventilation device and air conditioning device are selected using the selection method described in any one of claims 1 to 4. The air conditioning ventilation system includes: The air conditioning unit has a rated cooling capacity of approximately 12.5 kW; and The additional ventilation device (20) has a maximum ventilation capacity of 250m³. 3 / h.

6. An air conditioning ventilation system, installed on a floor area of ​​40m² 2 Above, 60m 2 The following is an indoor space equipped with an existing first ventilation device (10), wherein the ventilation rate of the existing first ventilation device (10) per hour is the first ventilation rate, wherein, The additional ventilation device and air conditioning device are selected using the selection method described in any one of claims 1 to 4. The air conditioning ventilation system includes: The air conditioning unit has a rated cooling capacity of approximately 7.1 kW; and The additional ventilation device (20) has a maximum ventilation capacity of 150m³. 3 / h.

7. The air conditioning ventilation system according to claim 5 or 6, wherein, The air conditioning unit has an air supply port (33) for receiving supply gas (SA) from outside the indoor space. The ventilation device (20) also includes an air supply fan (26) for supplying external gas (OA) to the air conditioning unit as the supply gas (SA). The air conditioning ventilation system also includes a gas supply path forming component (24), which is connected to the ventilation device and the air conditioning device to form a gas supply path (24a) that guides the supply gas (SA) from the ventilation device to the air supply port of the air conditioning device.

8. The air conditioning ventilation system according to claim 7, wherein, The ventilation device (20) also has: The housing (50) houses the air supply fan (26); An exhaust fan (28), housed within the casing, is used to deliver air from the interior space (SI) as exhaust gas (EA) to the outside (SO) of the interior space; and A heat exchange element (40) that allows the return gas (RA), which becomes the exhaust gas (EA), to exchange heat with the external gas (OA). The outer casing has: a first opening (51) for taking in air from the indoor space as the return gas (RA); a second opening (52) for sending the return gas (RA) as the exhaust gas (EA) to the outside of the indoor space; a third opening (53) for taking in the external gas (OA); and a fourth opening (54) connected to the gas supply path forming component. The air conditioning ventilation system also includes a pressure adjustment unit (58) that adjusts the air pressure in such a way that the pressure difference between the return gas (RA) flowing from the first opening (51) to the second opening (52) in the ventilation device and the external gas (OA) flowing from the third opening (53) to the fourth opening (54) in the ventilation device is reduced.

9. The air conditioning ventilation system according to claim 5 or 6, wherein, The air conditioning ventilation system also includes a remote control (90) for controlling the air conditioning unit and the ventilation unit.

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