JP2012077968A - Air conditioning method and air conditioning system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning method and an air conditioning system capable of making a specified index close to an optimal value even when outside air with adjusted humidity is supplied to air-conditioned rooms of a plurality of systems.SOLUTION: The air conditioning system 1 includes an outside adjusting machine 11 for adjusting the humidity of outside air OA, an air volume adjusting device 15 for adjusting the air volume of adjusted outside air QA, and a controller 60. A plurality of air volume adjusting devices 15 are provided to a plurality of air-conditioned rooms R. The controller 60 calculates a necessary dehumidification air volume when the adjusted outside air QA is supplied individually to each of the air-conditioned rooms R at a first state point, calculates a necessary outside air volume, adopts a larger volume from among the dehumidification air volume and necessary outside air volume, and finds out a specified index (consumption energy, etc.) to set a total air volume to the adjusted outside air QA at the first state point and required for conveyance. The specified index is calculated regarding a plurality of state points including a second state point. A minimum state point is adopted among the calculated state points to generate the adjusted outside air QA with the adjusted humidity.

Description

  The present invention relates to an air-conditioning method and an air-conditioning system, and more particularly to an air-conditioning method and an air-conditioning system that can bring a predetermined index close to an optimum value even when supplying outside air with adjusted humidity to a plurality of air-conditioned rooms.

  In recent years, a radiant cooling / heating system using radiant heat has attracted attention as a cooling / heating system that achieves both energy saving and comfort. The radiant cooling and heating system mainly processes the sensible heat of the air-conditioned room with the radiant heat from the radiant panel, and supplies the air to the air-conditioned room with the outside air adjusted in humidity by the external air conditioner. This is one form of a sensible heat latent heat separation treatment system in which sensible heat treatment and latent heat treatment are separated. As control of the sensible heat latent heat separation processing system, there is one that adjusts the amount of supplied outside air so that the carbon dioxide concentration in the air-conditioned room becomes a predetermined concentration (for example, see Patent Document 1).

JP 2008-304096 (paragraph 0042, etc.)

  However, when the introduced outside air flow rate is uniformly determined based on the carbon dioxide concentration, in order to reduce the enthalpy so that the latent heat of the air-conditioned room can be processed by the outside air flow rate, an operating point in an appropriate range is set for the coil. It may happen that you have to drive off. Or the case where it must drive | operate outside the operating point of a suitable range for the fan which conveys external air may arise. At this time, it is conceivable that the viewpoint of determining the outside air introduction flow rate is based on the appropriate one of the carbon dioxide concentration and the operating point of the equipment, but the outside air treated by the external air conditioner is one air-conditioned room. However, it is difficult to apply when supplying air to multiple air-conditioned rooms because the situation is generally different for each air-conditioned room. It is thought that it can approach.

  An object of the present invention is to provide an air conditioning method and an air conditioning system capable of bringing a predetermined index close to an optimum value even when supplying outside air with adjusted humidity to a plurality of air-conditioned rooms. To do.

  In order to achieve the above object, the air conditioning method according to the first aspect of the present invention, for example, referring to FIGS. 1 to 3, adjusts the humidity of the outside air OA and adjusts the adjusted outside air with the humidity adjusted. An air conditioning method in which QA is supplied to a plurality of air-conditioned rooms R to air-condition the plurality of air-conditioned rooms R; adjusted outside air QA is previously associated with a target humidity PS of the air-conditioned room R When supplying the plurality of air-conditioned rooms R at the first state point P1, which is the state point on the air diagram, the amount of dehumidified air Qh1 required for setting the plurality of air-conditioned rooms R to the target humidity PS is A first dehumidifying air amount calculating step (St1) to be calculated individually; a necessary outside air amount calculating step (St2) to individually calculate the amount of outside air necessary for setting the carbon dioxide concentration of the plurality of air-conditioned rooms R to a predetermined concentration And a first dehumidifying air volume calculating step (S) for each of the plurality of air-conditioned rooms R. A first adopting step (St3) in which the dehumidifying air amount Qh1 calculated in 1) and the outside air amount Qr calculated in the necessary outside air amount calculating step (St2) are compared and the larger one is adopted; A predetermined index for reducing the enthalpy so that the outside air OA of the first total air volume ΣQe1 that is the sum of the air volumes individually adopted in the adopting step (St3) becomes the adjusted outside air QA of the first state point P1. The first change amount calculation that calculates the change amount of the predetermined index when the adjusted outside air QA of the first total air flow amount ΣQe1 is transported to the plurality of air-conditioned rooms R and calculates the change amount Step (St4); second dehumidification air amount calculation for individually calculating the dehumidification air amount Qh2 for the second state point P2 which is a state point on the air diagram different from the first state point P1 Step (St5); about a plurality of air-conditioned rooms R Separately, the dehumidifying air amount Qh2 calculated in the second dehumidifying air amount calculating step (St5) is compared with the outside air amount Qr calculated in the necessary outside air amount calculating step (St2), and the larger one is adopted. The outside air OA of the second total air volume ΣQe2, which is the sum of the air volumes individually adopted in the adoption step (St6) and the second adoption step (St6), is used as the adjusted outside air QA of the second state point P2. The amount of change in the predetermined index when reducing the enthalpy is calculated, and the amount of change in the predetermined index when the adjusted outside air QA of the second total air volume ΣQe2 is transferred to the plurality of air-conditioned rooms R is calculated. The second change amount calculation step (St7), and the state point of the adjusted outside air QA is calculated with the first change amount Δ1 of the predetermined index calculated in the first change amount calculation step (St4). The predetermined amount calculated in the second change amount calculating step (St7) Of the second change amount Δ2 of targets, and a state point updating process (St8) to update the status point used for calculation of smallest variation of predetermined index.

  If comprised in this way, it will process to the outside air of a state point for which a predetermined | prescribed parameter | index becomes appropriate with respect to the sum total of the external air supplied to several air-conditioned rooms, and a predetermined | prescribed parameter | index will be approximated to an optimal value. Can do.

  The air conditioning method according to the second aspect of the present invention is the air conditioning method according to the first aspect of the present invention, wherein the predetermined index is at least one of energy consumption, cost, and carbon dioxide emission. One.

  If comprised in this way, the predetermined | prescribed parameter | index adapted to a user's sense of values can be approximated to an optimal value.

  Moreover, when the air-conditioning method according to the third aspect of the present invention is shown, for example, with reference to FIG. 1 and FIG. 2, in the air-conditioning method according to the first aspect or the second aspect of the present invention, A plurality of change amounts Δ2 are calculated for a plurality of state points; the state point update step (St8) is used to calculate a minimum change amount from the first change amount and the plurality of second change amounts. The state point of the adjusted outside air QA is updated to the state point.

  With this configuration, it is possible to increase the number of options for approaching the optimal value of the predetermined index, and the probability that the predetermined index can be made closer to the optimal value increases.

  Moreover, the air conditioning system which concerns on the 4th aspect of this invention is a control which performs the air-conditioning method which concerns on any one aspect of the said 1st aspect thru | or 3rd aspect of this invention, as shown, for example in FIG. An air conditioner 11 for adjusting the humidity of the outside air OA; and an air volume adjusting device 15 for adjusting the air volume of the adjusted outside air QA supplied to the air-conditioned room R, corresponding to a plurality of air-conditioned rooms R And a plurality of air volume adjusting devices 15 provided.

  If comprised in this way, it will become an air-conditioning system which can make a predetermined parameter | index close to an optimal value.

  Further, the air conditioning system according to the fifth aspect of the present invention is, for example, as shown in FIGS. 1 and 2, in the air conditioning system 1 according to the fourth aspect of the present invention, the state of the outside air OA on the air diagram. Pre-adjustment outside air condition detectors 51 and 52 that detect physical quantities that identify the air conditioner; and an indoor humidity detector 56 that is provided corresponding to each of the plurality of air-conditioned rooms R and detects the humidity in the air-conditioned room R; A carbon dioxide concentration detector 57 provided corresponding to each of the plurality of air-conditioned rooms R and detecting the carbon dioxide concentration in the air-conditioned room R; the control device 60 is detected by the indoor humidity detector 56 The necessary dehumidified air volume Qh1 in the first dehumidified air volume calculating step (St1) is calculated from the obtained value, and the necessary outside air volume Qr in the required outside air volume calculating step (St2) is calculated from the value detected by the carbon dioxide concentration detector 57. As well as calculating It is configured to calculate a change amount of a predetermined index in reducing the enthalpy before state point updated in the detected value and the state point updating process at ambient condition detector 51 and 52 (St8).

  If comprised in this way, according to the change of the state of an air-conditioned room, the state point of the adjusted outside air in which humidity was adjusted can be changed appropriately.

  According to the present invention, processing is performed on the outside air at a state point where the predetermined index is appropriate for the sum of the outside air supplied to the plurality of air-conditioned rooms, and the predetermined index is brought close to the optimum value. Can do.

1 is a schematic system diagram of an air conditioning system according to an embodiment of the present invention. It is a conceptual diagram explaining control of the air conditioning system which concerns on embodiment of this invention. It is an air line figure which shows the state of the air in the air conditioning system which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or similar members are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, an air conditioning system 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic system diagram of the air conditioning system 1. The air conditioning system 1 includes an external air conditioner 11 that adjusts the humidity of the outside air OA, a heat source device 13 that supplies cold water C as a heat medium to the external air conditioner 11, and the humidity of the outside air OA is adjusted by the external air conditioner 11. A VAV (variable air volume device) 15 as an air volume adjusting device for adjusting the air volume of the adjusted outside air QA, an air conditioner 18 for adjusting the temperature of the supply air SA supplied to the air-conditioned room R, and the sensible heat of the air-conditioned room R , A heat source device 23 for supplying cold / hot water CH as a heat medium to the air conditioner 18 and the radiation panel 21, various instruments 51 to 57, and a control device 60.

  The external air conditioner 11 introduces the outside air OA, cools and dehumidifies the introduced outside air OA with the cold water C from the heat source unit 13 to adjust the humidity, and generates the adjusted outside air QA in which the humidity of the outside air OA is adjusted. It is. The external air conditioner 11 includes a coil 11c that cools the outside air OA and a fan 11f that discharges the adjusted outside air QA. The external air conditioner 11 includes a heat exchanger 11x that performs heat exchange between the air (exhaust air EA) in the air-conditioned room R to be discharged and the external air OA before humidity adjustment. In the following description, the outside air cooled and dehumidified using the energy of the heat source unit 13 will be referred to as adjusted outside air QA, and even after passing through the heat exchanger 11x, the concept of the outside air OA is introduced before being introduced into the coil 11c. To be included. Between the coil 11c of the external air conditioner 11 and the heat exchanger 11x, an outside air thermometer 51 that detects the temperature of the outside air OA and an outside air hygrometer 52 that detects the humidity of the outside air OA are disposed. The outside air thermometer 51 and the outside air hygrometer 52 constitute an unadjusted outside air state detector. Since the external air conditioner 11 cools the outside air OA when adjusting the humidity of the outside air OA, the temperature of the outside air OA also changes as a result.

  The external air conditioner 11 includes an outside air duct 31 that introduces outside air OA, a regulated outside air duct 32 that flows regulated outside air QA, an exhaust duct 33 that introduces exhaust air EA from the air-conditioned room R, and a heat exchanger after heat exchange. An exhaust duct 34 that guides the exhaust EA to the outside is connected to each other. A branch duct 35 that distributes the adjusted outside air QA is connected to the adjusted outside air duct 32. Although three branch ducts 35 are shown in FIG. 1, the number of air-conditioned rooms R to which the adjusted outside air QA is supplied from one system of the external air conditioner 11 actually serves as the main duct. It branches off from the adjusted outside air duct 32 to be fulfilled.

  The heat source device 13 is a device that adjusts the temperature of the cold water C supplied to the external air conditioner 11 using external energy (external energy) such as electricity or heat. Typically, a refrigerator or chilling unit is used. Used. The heat source unit 13 introduces cold water C whose temperature has been increased by heat exchange with the outside air OA in the external air conditioner 11, and evaporates latent heat from the cold water C when a refrigerant (not shown) circulating inside evaporates in the refrigeration cycle. It is configured to cool the cold water C by depriving it. The heat source unit 13 is connected to the coil 11c of the external air conditioner 11 by a chilled water outgoing pipe 41 that supplies the cooled chilled water C and a chilled water return pipe 42 that introduces the chilled water C whose temperature has increased.

  The VAV 15 is a device that is disposed in the branch duct 35 and discharges the adjusted outside air QA to be discharged with an air volume corresponding to the required air volume from the control device 60. The VAV 15 includes a wind speed sensor (not shown) that detects the wind speed of the passing gas, and a damper (not shown) that adjusts the air volume of the passing gas. Based on the passing wind speed detected by the wind speed sensor. The calculated passing air volume is compared with the required air volume, and the opening degree of the damper is adjusted so that the passing air volume approaches the required air volume. In this way, the VAV 15 calculates the passing air volume based on the passing air speed, so that appropriate air volume control is possible even when the static pressure of the duct changes.

  The air conditioner 18 introduces and mixes the adjusted outside air QA derived from the VAV 15 and the return air RA from the air-conditioned room R, adjusts the temperature of the mixed air, and supplies the air to the air-conditioned room R It is a device that generates SA. The air conditioner 18 includes a coil 18c that adjusts the temperature of the mixed air and a fan 18f that discharges the supply air SA. The fan 18f that pumps the supply air SA is configured to be able to change the discharge air volume of the supply air SA by changing the rotation speed by inverter control. The air conditioner 18 also has a mixing chamber 18m that mixes the introduced adjusted outside air QA and return air RA.

  A branch duct 35, a return air duct 38 for introducing the return air RA, and an air supply duct 36 that guides the supply air SA to the air-conditioned room R are connected to the air conditioner 18. In this embodiment, the branch duct 35 and the return air duct 38 are each connected to the mixing chamber 18m. However, the return air duct 38 is connected to the branch duct 35 on the downstream side of the VAV 15 so that the return air RA is adjusted outside air. It may be configured to be introduced into the air conditioner 18 after joining the QA.

  The radiation panel 21 is disposed on the ceiling of the air-conditioned room R and constitutes the ceiling surface of the air-conditioned room R. The radiating panel 21 is configured such that a pipe for flowing cold water C or hot water H (hereinafter collectively referred to as “cold / hot water CH”) as a heat medium is disposed on the surface of the ceiling side of the panel formed in a plate shape. Has been. The panel typically has a rectangular (rectangular or square) planar shape, but may have a polygonal planar shape such as a triangle or a hexagon. It is preferable to increase the heat transfer area by arranging the pipes in a meandering manner so that heat (cold heat or hot heat) held by the cold / hot water CH can be transmitted to the entire panel.

  The heat source device 23 is a device that adjusts the temperature of the cold / hot water CH supplied to the air conditioner 18 and the radiating panel 21 using external energy (external energy) such as electricity and heat, and is typically cold / hot water. A generator or a heat pump chiller is used. The heat source unit 23 includes a chilled / hot water outgoing pipe 44 through which the chilled / warm water CH whose temperature is adjusted, and a chilled / warm water return pipe for introducing the chilled / warm water CH after heat is used by the air conditioner 18 and / or the radiant panel 21. 46 is connected. The other end of the cold / hot water outgoing pipe 44 is connected to the coil 18 c of the air conditioner 18. The other end of the cold / hot water return pipe 46 is connected to the radiation panel 21. The air conditioner 18 and the radiation panel 21 are connected by a cold / hot water relay pipe 45. With this configuration, in the present embodiment, the cold / hot water CH whose temperature is adjusted by the heat source device 23 is first supplied to the air conditioner 18 to exchange heat with the supply air SA, and then After being supplied to the radiant panel 21 and exchanging radiant heat with an object in the air-conditioned room R to process the sensible heat in the air-conditioned room R, the sensible heat is returned to the heat source unit 23.

  The adjusted outside air duct 32 is provided with an adjusted outside air thermometer 53 that detects the temperature of the adjusted outside air QA and an adjusted outside air hygrometer 54 that detects the humidity of the adjusted outside air QA. The return air duct 38 includes a return air thermometer 55 that detects the temperature of the return air RA, a return air hygrometer 56 that detects the humidity of the return air RA, and a return carbon dioxide that detects the carbon dioxide concentration of the return air RA. A gas concentration meter 57 is provided. The return air thermometer 55 and the return air hygrometer 56 are configured to substantially detect the temperature and humidity in the air-conditioned room R. The return air thermometer 55, the return air hygrometer 56, and the return air carbon dioxide concentration meter 57 may be disposed in the air-conditioned room R. As the outside air hygrometer 52, the adjusted outside air hygrometer 54, and the return air hygrometer 56, typically, an electric hygrometer having a sensor using a semiconductor or the like as a sensing part is used, but even if a dew point meter is used. Good. The hygrometers 52, 54, and 56 are not limited to those that detect humidity alone, but may be those that indirectly detect humidity using the temperature detected by the thermometer. May be relative humidity or absolute humidity. Further, an air supply thermometer (not shown) for detecting the temperature of the supply air SA may be provided in the air supply duct 36 for temperature control of the supply air SA in the air conditioner 18.

  The control device 60 includes an external air conditioner control unit 61 that controls the external air conditioner 11 and an air conditioner control unit 68 that controls the VAV 15 and the air conditioner 18. Although the external air conditioner control unit 61 and the air conditioner control unit 68 are illustrated separately in FIG. 1, they may be configured integrally. The outside air conditioner control unit 61 is connected to the outside air thermometer 51, the outside air hygrometer 52, the adjusted outside air thermometer 53, and the adjusted outside air hygrometer 54 through signal cables, respectively. It is configured so that the amount of heat exchanged between the cold water C and the outside air OA in the coil 11c of the controller 11 can be adjusted. The adjustment of the amount of heat exchanged between the cold water C and the outside air OA is typically performed by changing the flow rate of the cold water C passing through the coil 11c, but the temperature of the cold water C supplied to the coil 11c is changed. Or it is good also as adjusting by changing both the temperature and flow volume of the cold water C. The external air conditioner control unit 61 and the air conditioner control unit 68 are connected by a signal cable, and are configured to be able to transmit data such as detection values to each other. The air conditioner control unit 68 is connected to the return air thermometer 55, the return air hygrometer 56, and the return air carbon dioxide concentration meter 57 via signal cables, respectively, and based on the detected values, the amount of dehumidified air and the required outside air amount Can be calculated or extracted. The air conditioner control unit 68 is connected to the fans 18f and VAV 15 of the air conditioner 18 through signal cables, respectively, and is based on data detected or calculated by the external air conditioner control unit 61 and / or the air conditioner control unit 68. Thus, the opening degree of the damper of the VAV 15 and the rotational speed of the fan 18f can be adjusted. Details of the control in the control device 60 will be described later.

  With continued reference to FIG. 1, the operation of the air conditioning system 1 will be described. First, a rough flow of air supplied to the air-conditioned room R will be described. When the air conditioning system 1 is activated, the outside air OA is introduced into the external air conditioner 11. The outside air OA introduced into the external conditioner 11 is cooled and dehumidified by the cold water C supplied from the heat source unit 13 to become adjusted outside air QA. The adjusted outside air QA flows through the adjusted outside air duct 32 and is divided into a plurality of branch ducts 35. The adjusted outside air QA flowing into the branch duct 35 is introduced into the air conditioner 18 after the air volume is adjusted by the VAV 15. In addition to the adjusted outside air QA, the return air RA from the air-conditioned room R is also introduced into the air conditioner 18, and after both are mixed, the temperature is adjusted by the cold / hot water CH supplied from the heat source device 23. It becomes supply air SA. The supply air SA is supplied to the air-conditioned room R through the air supply duct 36 and processes a part of sensible heat and latent heat of the air-conditioned room R. The remaining sensible heat in the air-conditioned room R is processed by the radiant heat from the radiant panel 21. Cold / hot water CH after heat exchange with the adjusted outside air QA by the air conditioner 18 is introduced into the radiation panel 21. The cold / hot water CH introduced into the radiation panel 21 is returned to the heat source unit 23 after processing the sensible heat of the air-conditioned room R. On the other hand, a part of the supply air SA that has been heat-treated in the air-conditioned room R is led to the air conditioner 18 through the return air duct 38 as return air RA, and the remainder is externally adjusted through the exhaust duct 33 as exhaust EA. After being guided to the machine 11 and exchanging heat with the outside air OA, it is discharged from the exhaust duct 34 to the outside.

  As described above, the air conditioning system 1 simplifies the system configuration by distributing the adjusted outside air QA adjusted by one external air conditioner 11 to a plurality of systems. On the other hand, each air-conditioned room R to which the distributed adjusted outside air QA is supplied usually has a different number of people in the room, so that the required ventilation amount and the heat load to be processed are different. In the present embodiment, since the carbon dioxide concentration in each air-conditioned room R is detected by the return air carbon dioxide concentration meter 57, the carbon dioxide concentration in the air-conditioned room R is required to be a predetermined concentration (for example, required by the Building Standard Law). If the minimum amount of outside air OA that can be maintained is supplied, the amount of outside air OA to be introduced can be minimized. In this case, the process of the latent heat of the air-conditioned room R is performed with the minimum amount of outside air OA introduced. However, when the air volume of the outside air OA to be introduced is determined only by the carbon dioxide concentration, in order to maintain the humidity of each air-conditioned room R below the target humidity, the state condition of the humidity of the adjusted outside air QA is the worst condition. It will be adjusted according to the air-conditioned room R. For this reason, since the air volume determined from the viewpoint of maintaining the carbon dioxide concentration at a predetermined concentration is not necessarily an air volume appropriate for the processing capacity of the external air conditioner 11, energy consumption, running cost, or the entire air conditioning system 1 In order to optimize a predetermined index such as carbon dioxide emission amount, the air volume determined from the viewpoint of carbon dioxide concentration is not always optimal. Therefore, in the air conditioning system 1, a predetermined index is brought close to the optimum value by performing the following control.

  FIG. 2 is a conceptual diagram illustrating the control of the air conditioning system 1. FIG. 3 is an air diagram showing the state of air in the air conditioning system 1. In the following description, when referring to the configuration of the air conditioning system 1, FIG. 1 will be referred to as appropriate. Further, in the following description, the adjusted outside air QA generated by one external air conditioner 11 is divided into three air-conditioned rooms R (in the case of being distinguished for convenience in the following description, they are indicated by the symbols R1, R2, and R3, respectively). However, two or four or more air-conditioned rooms R can be similarly applied. In the following description, it is assumed that the predetermined index is energy consumption. The control device 60 controls the air conditioning system 1 so that the air state in each of the air-conditioned rooms R1, R2, and R3 approaches a target indoor air state point (hereinafter referred to as “target state point PS”). Control. In the present embodiment, it is assumed that the target state point PS is a dry bulb temperature of 28 ° C. and a relative humidity of 45% (the absolute humidity at this time is 0.01063 kg / kg (DA)).

The control device 60 detects the temperature and humidity of the outside air OA from the outside air thermometer 51 and the outside air hygrometer 52, and the state point P0 on the air diagram of the outside air OA (in the example shown in FIG. 3, the dry bulb temperature is 28). ° C, wet bulb temperature is 21.3 ° C). Further, the control device 60 detects the state point of the return air RA from the return air thermometer 55 and the return air hygrometer 56 for each of the air-conditioned rooms R1, R2, and R3, and adjusts the adjusted outside air QA by the external air conditioner 11. If it is adjusted to the first state point P1, the first dehumidified air volume Qh1, which is the air volume necessary for setting the inside of each air-conditioned room R1, R2, R3 to the target humidity, is set to each air-conditioned room R1, R2. , R3 is calculated (first dehumidifying air volume calculating step: St1). The first state point P1 is a state point previously associated with the humidity of the target state point PS, and is typically a predetermined value at startup (which may be an absolute value, such as an outside air temperature). It may be a value having a predetermined relationship with respect to), and is the state point that was being operated immediately before the operation. In the present embodiment, the first state point P1 is a dry bulb temperature of 12.3 ° C. and a relative humidity of 90%, the first dehumidified air volume Qh1 is 1433 m ³ / h in the air-conditioned room R1, and the air-conditioned room R2 is 1323m ³ / h, the air conditioning chamber R3 has a 551m ³ / h.

Further, the control device 60 detects the carbon dioxide concentration from the return-air carbon dioxide concentration meter 57, and uses the air volume of the outside air OA necessary for setting the carbon dioxide concentration in each of the air-conditioned rooms R1, R2, and R3 to a predetermined concentration. A certain required outside air volume Qr is calculated (required outside air volume calculating step: St2). The necessary outside air volume Qr is correlated with the ventilation volume, and typically varies depending on the number of people in the room. In this embodiment, the required outside air wind amount Qr is, the air conditioning chamber R1 is 1800 m ³ / h, the air conditioning chamber R2 is 2000 m ³ / h, the air conditioning chamber R3 has a 300m ³ / h. When the first dehumidified air volume Qh1 and the required outside air volume Qr are calculated, the control device 60 adopts the larger one of the first dehumidified air volume Qh1 and the required outside air volume Qr for each air-conditioned room R1, R2, R3. To the first adopted air volume Qe1 (first adopted step: St3). In this embodiment, the first adoption airflow Qe1 is, the air conditioning chamber R1 is 1800 m ³ / h, the air conditioning chamber R2 is 2000 m ³ / h, the air conditioning chamber R3 has a 551m ³ / h.

Thereafter, the control device 60 calculates the first total air volume ΣQe1 by summing the first adopted air volumes Qe1 of the air-conditioned rooms R1, R2, and R3. In the present embodiment, the first total air volume ΣQe1 is 4351 m ³ / h. The first total air volume ΣQe1 is the air volume of the outside air OA introduced into the external air conditioner 11 when the adjusted outside air QA at the first state point P1 is supplied to the air-conditioned room R. Then, the control device 60 calculates energy consumption (a change amount of a predetermined index) when reducing the enthalpy so that the outside air OA of the first total air volume ΣQe1 becomes the adjusted outside air QA of the first state point P1. To do. The energy consumed when reducing the enthalpy is the sum of the power of the external air conditioner 11, the power of the heat source device 13, the power of conveying the cold water C, and the like. However, this total excludes the amount contributing to the sensible heat treatment in the air-conditioned room R. The sensible heat treatment contribution of the air-conditioned room R is typically expressed as “sensible heat treatment contribution = 0.33 × outside air OA as heat source power corresponding to the amount of sensible heat treatment in the air-conditioned room R by the adjusted outside air QA. Air volume (m ³ / h) × (temperature in air-conditioned room R (° C.) − Temperature of adjusted outside air QA (° C.)) ÷ COP of heat source machine ” The numerical value “0.33” in the above formula is the volume specific heat of air (Wh / (m ³ ) determined by the product of the constant pressure specific heat of air (Wh / (kg · K)) and the density of air (kg / m ³ ). -An abbreviation for K)). In addition, when the COPs of the heat source unit 13 and the heat source unit 23 are different, the sensible heat treatment contribution of the air-conditioned room R that is excluded from the consumed energy can be consumed by the entire air conditioning system 1 by applying the COP of the heat source unit 23. When the energy is evaluated, the decrease in the load of the heat source device 23 can be correctly reflected. When a certain heat load is processed, the smaller the first total air volume ΣQe1, the larger the flow rate of the cold water C passing through the coil 11c of the external air conditioner 11 in order to increase the reduction amount of the specific enthalpy. The flow resistance tends to increase. In parallel, the control device 60 calculates energy consumption (amount of change of a predetermined index) when the adjusted outside air QA having the first total air volume ΣQe1 is conveyed to each of the air-conditioned rooms R1, R2, and R3. . The energy consumption at this time is typically the power of the fan 11f. Then, after calculating the energy consumption for reducing the enthalpy and the energy consumption for transporting the adjusted outside air QA for the first total air volume ΣQe1, the control device 60 calculates the first change amount Δ1 obtained by adding these. (First change amount calculating step: St4).

Next, in order to search for the optimum state point of the adjusted outside air QA, the control device 60 uses the adjusted outside air QA derived from the external conditioner 11 as the second state point instead of the first state point P1. When adjusted to P2, the second dehumidified air volume Qh2, which is the air volume necessary to bring the air-conditioned rooms R1, R2, R3 to the target humidity, is calculated for each air-conditioned room R1, R2, R3 ( Second dehumidifying air amount calculating step: St5). The second state point P2 is an arbitrary state point different from the first state point P1. In view of the behavior near the dew point of the air (outside air OA) cooled and dehumidified by the external air conditioner 11, the second state point P2 is in the vicinity of the relative humidity line (typically the same relative humidity) through which the first state point P1 passes. ) Is preferable. In the present embodiment, the second state point P2 is a dry bulb temperature of 11.8 ° C. and a relative humidity of 90%, the second dehumidified air volume Qh2 is 1300 m ³ / h in the air-conditioned room R1, and the air-conditioned room R2 is 1200 m ³ / h, and the air-conditioned room R3 is 500 m ³ / h.

When the second dehumidified air volume Qh2 is calculated, the control device 60 adopts the larger one of the second dehumidified air volume Qh2 and the required outside air volume Qr for each of the air-conditioned rooms R1, R2, and R3 and adopts the second. The air volume is Qe2 (second adoption step: St6). The necessary outside air volume Qr is the same as the air volume calculated in the necessary outside air volume calculating step (St2) before comparing with the first dehumidified air volume Qh1 at the first state point P1. In this embodiment, the second adoption airflow Qe2 can be air-conditioned chamber R1 is 1800 m ³ / h, the air conditioning chamber R2 is 2000 m ³ / h, the air conditioning chamber R3 has a 500m ³ / h.

Thereafter, the control device 60 calculates the second total air volume ΣQe2 by summing the second selected air volumes Qe2 of the air-conditioned rooms R1, R2, and R3. In the present embodiment, the second total air volume ΣQe2 is 4300 m ³ / h. The second total air volume ΣQe2 is the air volume of the outside air OA introduced into the external air conditioner 11 when the adjusted outside air QA at the second state point P2 is supplied to the air-conditioned room R. Then, in the same manner as in the first change amount calculation step (St4), the control device 60 uses the enthalpy to set the outside air OA of the second total air volume ΣQe2 as the adjusted outside air QA of the second state point P2. Energy consumption (a change amount of a predetermined index) is calculated (the energy consumption here is also divided by the sensible heat treatment contribution in the air-conditioned room R in the same manner as when the first change amount Δ1 is calculated). ), Calculating energy consumption (amount of change of a predetermined index) when transporting the adjusted outside air QA of the second total air volume ΣQe2 to each air-conditioned room R1, R2, R3, and adding them together The calculated second variation Δ2 is calculated (second variation calculation step: St7).

Further, in the present embodiment, another second change amount Δ2 is calculated from the viewpoint of increasing choices when selecting an optimal state point of the adjusted outside air QA. In order to distinguish the state point, dehumidified air volume, and adopted air volume necessary for calculating another change amount from those used for calculating the second change amount Δ2 described above, the prefix “3rd Of "". When the adjusted outside air QA derived from the external air conditioner 11 is adjusted to the third state point P3, the control device 60 is necessary for setting the air-conditioned rooms R1, R2, and R3 to the target humidity. A third dehumidifying air volume Qh3, which is an air volume, is calculated for each air-conditioned room R1, R2, R3. In the present embodiment, the third state point P3 is a dry bulb temperature of 13.2 ° C. and a relative humidity of 90%, the third dehumidified air volume Qh3 is 1770 m ³ / h in the air-conditioned room R1, and the air-conditioned room R2 is 1634m ³ / h, the air conditioning chamber R3 has a 681m ³ / h.

When the third dehumidified air volume Qh3 is calculated, the control device 60 determines the third dehumidified air volume Qh3 and the necessary outside air volume Qr (first variation Δ1 and second variation) for each of the air-conditioned rooms R1, R2, and R3. The larger one of the values (same as the value when calculating the amount Δ2) is adopted as the third adopted air volume Qe3. In this embodiment, the third adopted airflow Qe3 is, the air conditioning chamber R1 is 1800 m ³ / h, the air conditioning chamber R2 is 2000 m ³ / h, the air conditioning chamber R3 has a 681m ³ / h.

Thereafter, the control device 60 calculates the third total air volume ΣQe3 by summing the third selected air volume Qe3 of each air-conditioned room R1, R2, R3. In the present embodiment, the third total air volume ΣQe3 is 4481 m ³ / h. This third total air volume ΣQe3 becomes the air volume of the outside air OA introduced into the external air conditioner 11 when the adjusted outside air QA at the third state point P3 is supplied to the air-conditioned room R. Then, the control device 60 calculates energy consumption (a change amount of a predetermined index) when reducing the enthalpy so that the outside air OA of the third total air volume ΣQe3 becomes the adjusted outside air QA of the third state point P3. (The energy consumption here also excludes the contribution of sensible heat treatment in the air-conditioned room R in the same way as when calculating the first and second change amounts Δ1 and Δ2), and the third total air volume ΣQe3 The energy consumption (amount of change of a predetermined index) when the adjusted outside air QA is transported to each of the air-conditioned rooms R1, R2, and R3 is calculated, and a third change amount Δ3 is calculated by adding them together.

  After calculating the first change amount Δ1, the second change amount Δ2, and the third change amount Δ3, the smallest change (ie, the one that consumes the least amount of energy) is selected, and the selected change is made. The state point of the adjusted outside air QA used when calculating the amount is adopted as the state point of the control target and reflected in the actual control (state point update step: St8). Whether the state point of the adjusted outside air QA is the state point adopted in the state point update process is determined by detecting the temperature and humidity of the adjusted outside air QA with the adjusted outside air thermometer 53 and the adjusted outside air hygrometer 54. It is confirmed. When the state point of the adjusted outside air QA is not the adopted state point, the flow rate and / or temperature of the cold water C supplied to the external air conditioner 11 is adjusted to approach the adopted state point. Then, after the state point is updated, the process returns to the first dehumidifying air amount calculation step (St1) continuously or after a predetermined time has elapsed, and thereafter the above-described control is repeated.

  As described above, the air conditioning system 1 determines the air volume of the outside air OA to be introduced from the viewpoint of bringing the predetermined index close to the optimum value without regard to the flow rate of the outside air necessary from the viewpoint of the carbon dioxide concentration. The optimum operation can be performed for a predetermined index.

  In the above description, three change amounts are calculated in order to adopt the state point of the adjusted outside air QA that best suits the predetermined index. However, two change amounts are calculated from the viewpoint of reducing the calculation load. It is good also as four or more from a viewpoint which expands the selection range and searches for the state point of the more suitable adjusted outside air QA.

  In the above description, the outside air thermometer 51 and the outside air hygrometer 52 are provided between the coil 11c of the outside air conditioner 11 and the heat exchanger 11x. However, the outside air conditioner 11 is provided with the heat exchanger 11x. If not, it may be provided outside the air duct 31 or outdoors. Even if the external air conditioner 11 is provided with a heat exchanger 11x, if the heat exchanger 11x is a heat exchanger that exchanges only sensible heat, the outdoor air hygrometer 52 is placed outside the outdoor air duct 31 or outdoors. It may be provided.

  In the above description, the sensible heat of the air-conditioned room R is mainly processed by the air conditioner 18 and the radiating panel 21, but when the radiating panel 21 is sufficient, the adjusted outside air QA is not provided without providing the air conditioner 18. May be supplied to each air-conditioned room R. If it does in this way, the composition of air-conditioning system 1 can be simplified.

1 Air conditioning system 11 External air conditioner 15 VAV
51 Outside air temperature meter 52 Outside air humidity meter 56 Return air humidity meter 57 Return air carbon dioxide concentration meter 60 Control device OA Outside air QA Adjusted outside air R Air-conditioned room

Claims (5)

An air conditioning method for adjusting the humidity of outside air, supplying adjusted outside air with adjusted humidity to a plurality of air-conditioned rooms, and performing air conditioning of the plurality of air-conditioned rooms;
When supplying the adjusted outside air to the plurality of air-conditioned rooms at a first state point that is a state point on the air diagram that is previously associated with the target humidity of the air-conditioned room, A first dehumidifying air amount calculating step for individually calculating a dehumidifying air amount necessary for setting the air-conditioned room of the air to the target humidity;
A necessary outside air amount calculating step for individually calculating the amount of outside air necessary for setting the carbon dioxide concentrations of the plurality of air-conditioned rooms to a predetermined concentration;
For the plurality of air-conditioned rooms, the dehumidifying air amount calculated in the first dehumidifying air amount calculating step is compared with the outside air amount calculated in the necessary outside air amount calculating step, and the larger one is adopted. 1 adoption process;
A predetermined index for reducing enthalpy so that the outside air of the first total air volume, which is the sum of the air volumes individually adopted in the first adopting step, becomes the adjusted outside air of the first state point. A first change amount calculation that calculates a change amount and calculates and adds a change amount of the predetermined index when the adjusted outside air of the first total air volume is transferred to the plurality of air-conditioned rooms. Process and;
A second dehumidifying air amount calculating step for individually calculating the dehumidifying air amount for a second state point that is a state point on an air diagram different from the first state point;
For the plurality of air-conditioned rooms, the dehumidifying air amount calculated in the second dehumidifying air amount calculating step is compared with the outside air amount calculated in the required outside air amount calculating step, and the larger one is adopted. 2 adoption processes;
A predetermined index for reducing enthalpy so that the outside air of the second total air volume, which is the sum of the air volumes individually adopted in the second adoption step, becomes the adjusted outside air of the second state point. A second change amount calculation that calculates a change amount and calculates and adds a change amount of the predetermined index when the adjusted outside air of the second total air volume is conveyed to the plurality of air-conditioned rooms. Process and;
The state point of the adjusted outside air is calculated using the first change amount of the predetermined index calculated in the first change amount calculation step and the predetermined index calculated in the second change amount calculation step. A state point updating step of updating to the state point used to calculate the amount of change of the predetermined index that is the minimum among the second amount of change;
Air conditioning method. The predetermined indicator is at least one of energy consumption, cost, and carbon dioxide emissions;
The air conditioning method according to claim 1. A plurality of the second change amounts are calculated for a plurality of the state points;
The state point updating step updates the state point of the adjusted outside air to the state point used for calculating the minimum amount of change from the first amount of change and the plurality of second amounts of change. Configured as follows;
The air conditioning method according to claim 1 or 2. A control device for executing the air conditioning method according to any one of claims 1 to 3;
An external air conditioner for adjusting the humidity of the outside air;
An air volume adjusting device for adjusting the air volume of the adjusted outside air supplied to the air-conditioned room, comprising: a plurality of air volume adjusting devices provided corresponding to the plurality of air-conditioned rooms;
Air conditioning system. A pre-adjustment outdoor air condition detector for detecting a physical quantity that identifies a condition on an air diagram of the outdoor air;
An indoor humidity detector that is provided corresponding to each of the plurality of air-conditioned rooms and detects the humidity in the air-conditioned room;
A carbon dioxide concentration detector that is provided corresponding to each of the plurality of air-conditioned rooms and detects a carbon dioxide concentration in the air-conditioned room;
The control device calculates the necessary dehumidified air volume in the first dehumidified air volume calculating step from the value detected by the indoor humidity detector, and calculates the necessary outside air volume from the value detected by the carbon dioxide concentration detector. A predetermined index for reducing the enthalpy from the value detected by the pre-adjustment outside air state detector and the state point updated in the state point updating step while calculating the necessary outside air amount in the calculating step. Configured to calculate the amount of change;
The air conditioning system according to claim 4.

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