Air conditioning system

Abstract

To save energy even when optionally changing a set temperature or set humidity.SOLUTION: An air conditioning system (1) supplies air (A) of which temperature (T) and humidity (H) have been adjusted to an object space (R). The air conditioning system includes: a cooler (10) for cooling and dehumidifying air; a heater (20) for heating the air cooled and dehumidified by the cooler; a humidifier (30) for humidifying the air heated by the heater; a cooling passage (50) for causing air to pass through the cooler; a bypass passage (60) for causing air to bypass the cooler without causing the air to pass through the cooler; a merging passage (70) for merging the air passing through the cooling passage and the air passing through the bypass passage with each other and causing the merged air to pass through the heater and the humidifier to supply the merged air to the object space; and a first damper (80) for regulating a flow rate (Q1) of the air flowing in the bypass passage.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to air conditioning systems. [Background technology]

[0002] 2. Description of the Related Art Air conditioning systems that supply temperature- and humidity-controlled air to a target space are known, and include a cooler, a heater, and a humidifier.

[0003] A cooler both cools and dehumidifies air. Usually, the amount of cooling or dehumidification of air cooled and dehumidified by a cooler exceeds the set temperature and humidity. A heater heats excessively cooled air to the set temperature. A humidifier humidifies excessively dehumidified air to the set humidity.

[0004] From the viewpoint of energy conservation, it is desirable to reduce the amount of heating by the heater and the amount of humidification by the humidifier. To achieve this, it is desirable to quickly reach the set temperature and humidity by cooling and dehumidifying the air with the cooler.

[0005] The air conditioner disclosed in Patent Document 1 is equipped with a cooler (heat exchanger) consisting of multiple rows of coils. In one region of this cooler, cold water is passed through most of the multiple rows of coils to form a supercooling (latent heat treatment) zone, and in another region, cold water is passed through one or several rows of coils to form a sensible heat treatment zone where there is essentially no supercooling. In this cooler, air from upstream is divided into the supercooling treatment zone and the sensible heat treatment zone, and then mixed again and supplied downstream.

[0006] This air conditioner cooler eliminates the need for a separate reheat coil and a separate heat source, and is expected to have an energy-saving effect. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2023-004097 Summary of the Invention [Problem to be solved by the invention]

[0008] In the air conditioner cooler disclosed in Patent Document 1, multiple rows of coils are allocated to the supercooling zone and the sensible heat treatment zone in an appropriate ratio, allowing the air to reach a specific set temperature and humidity in one go. Since a separate reheat coil is not required, energy savings can be achieved.

[0009] However, in the air conditioner cooler disclosed in Patent Document 1, if the set temperature and set humidity change, the allocation of the supercooling zone and the sensible heat treatment zone in the multiple rows of coils must be changed again, which requires the cooler to be redesigned.

[0010] The cooler of the air conditioner described in Patent Document 1 can achieve energy savings only when the set temperature and set humidity are fixed to specific values, but cannot achieve energy savings when the set temperature and set humidity are to be changed arbitrarily.

[0011] An object of the present disclosure is to provide an air conditioning system that can achieve energy savings even when the set temperature or set humidity is changed arbitrarily. [Means for solving the problem]

[0012] A first aspect of the present disclosure is directed to an air conditioning system 1. The air conditioning system 1 supplies air A, the temperature of which has been adjusted (T) and humidity (H), to a target space R. The air conditioning system (1) includes a cooler (10) that cools and dehumidifies air (A), a heater (20) that heats the air (A) cooled and dehumidified by the cooler (10), a humidifier (30) that humidifies the air (A) heated by the heater (20), a cooling passage (50) that passes the air (A) through the cooler (10), a bypass passage (60) that bypasses the air (A) without passing it through the cooler (10), a confluence passage (70) that confluences the air (A) passing through the cooling passage (50) and the air (A) passing through the bypass passage (60), and passes the confluenced air (A) through the heater (20) and the humidifier (30) to supply it to the target space (R), and a first damper (80) that adjusts the flow rate (Q1) of the air (A) flowing through the bypass passage (60).

[0013] According to the first aspect, by controlling the first damper (80) in accordance with the set temperature or the set humidity, it is possible to arbitrarily adjust the ratio between the air (A) that passes through the cooling passage (50) and the cooler (10) to be cooled and dehumidified, and the air (A) that passes through the bypass passage (60) and bypasses the cooler (10) without passing through the cooler (10) to be not cooled and dehumidified.

[0014] The amount of heating of the air (A) by the heater (20) or the amount of humidification of the air (A) by the humidifier (30) for bringing the temperature (T) of the air (A) to a set temperature or for bringing the humidity (H) of the air (A) to a set humidity can be reduced.

[0015] It is possible to provide an air conditioning system (1) that can achieve energy conservation even when the set temperature or set humidity is changed arbitrarily.

[0016] A second aspect of the present disclosure is directed to the air conditioning system (1) according to the first aspect. The air conditioning system (1) includes a second damper (90) that adjusts a flow rate (Q2) of air (A) flowing through the cooling passage (50).

[0017] According to the second aspect, by controlling not only the first damper (80) but also the second damper (90), the ratio between the flow rate (Q1) of the air (A) flowing through the bypass passage (60) and the flow rate (Q2) of the air (A) flowing through the cooling passage (50) can be adjusted with more freedom.

[0018] A third aspect of the present disclosure is directed to the air conditioning system (1) according to the first or second aspect. In the air conditioning system (1), when a set value (Ts) of a temperature (T) in the target space (R) is lower than a first value (Ts1), the first damper (80) is fully closed.

[0019] According to the third aspect, when the set value (Ts) of the temperature (T) in the target space (R) is lower than the first value (Ts1), the first damper (80) is fully closed, and the air (A) flows entirely through the cooling passage (50) without flowing through the bypass passage (60). When the set value (Ts) of the temperature (T) is low, priority can be given to cooling by the cooler (10). [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 shows an air conditioning system (1) according to a first embodiment. [Figure 2] FIG. 2 shows changes in the temperature (T) and humidity (H) of the air (A) when the bypass passage (60) and the first damper (80) are present according to the first embodiment. [Figure 3] FIG. 3 shows a control flow of the first damper (80) of the air conditioning system (1) according to the first embodiment. [Figure 4] FIG. 4 shows adjustment of the opening degree (F) of the first damper (80) according to the first embodiment. [Figure 5] FIG. 5 shows an air conditioning system (1) according to the second embodiment. [Figure 6] FIG. 6 shows an air conditioning system (1) according to the third embodiment. [Figure 7] FIG. 7 shows an air conditioning system (1) according to the fourth embodiment. [Figure 8] FIG. 8 shows the changes in the temperature (T) and humidity (H) of the air (A) when the bypass passage (60) and the first damper (80) are not provided. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical concept of the present disclosure. Since the drawings are intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary to facilitate understanding.

[0022] First Embodiment (Air conditioning system) An air conditioning system (1) according to a first embodiment will be described. In the following description, the upstream side and downstream side are based on the flow direction of air (A). FIG. 1 shows the air conditioning system (1). The air conditioning system (1) is applied to a test room (R). The test room (R) is an example of a target space. The air conditioning system (1) supplies air (A) whose temperature (T) and humidity (H) have been adjusted to the test room (R). The test room (R) is a constant temperature and humidity test room. The air (A) in the test room (R) is maintained at a constant temperature (T) and constant humidity (H).

[0023] The air conditioning system (1) includes a filter (2), a cooler (10), a heater (20), a humidifier (30), a fan (40), a housing (3), a cooling passage (50), a bypass passage (60), a merging passage (70), a first damper (80), a temperature sensor (4), a humidity sensor (5), and a controller (6).

[0024] The air (A) sent from the test chamber (R) through the first passage (P1) passes through the filter (2), which removes dust particles contained in the air (A).

[0025] The cooler (10) is a cooling coil. Air (A) from which dust particles have been removed by the filter (2) passes through the cooler (10). The cooler (10) cools and dehumidifies the air (A). The cooler (10) is connected to a chilled water circuit (11). The chilled water circuit (11) is provided with a chilled water valve (12). In the cooler (10), heat is exchanged between the air (A) passing through the cooler (10) and chilled water flowing in the chilled water circuit (11). The chilled water in the chilled water circuit (11) is cooled by a chiller unit. The chilled water valve (12) adjusts the opening (C) of the valve to adjust the flow rate of chilled water flowing in the chilled water circuit (11).

[0026] Specifically, the air (A) cooled by the cooler (10) is first cooled to the dew point temperature and then further cooled along the saturated vapor line. At this time, condensation occurs and the generated water is removed. In this way, the cooler (10) cools and dehumidifies the air (A).

[0027] The heater (20) is a heating coil. The heater (20) heats the air (A) cooled and dehumidified by the cooler (10). The heater (20) is connected to a hot water circuit (21). The hot water circuit (21) is provided with a hot water valve (22). In the heater (20), heat is exchanged between the air (A) passing through the heater (20) and the hot water flowing in the hot water circuit (21). The hot water in the hot water circuit (21) is heated by a chiller unit. The hot water valve (22) adjusts the opening (D) of the valve to adjust the flow rate of the hot water flowing in the hot water circuit (21).

[0028] The humidifier (30) humidifies the air (A) heated by the heater (20). The humidifier (30) is connected to a steam line (31). The steam line (31) is provided with a steam valve (32). The humidifier (30) releases the water vapor sent from the steam line (31) into the air (A). The steam valve (32) adjusts the opening (E) of the steam valve (32) to adjust the flow rate of water vapor flowing through the steam line (31).

[0029] The fan (40) sends (supplies) the air (A) humidified by the humidifier (30) to the test chamber (R) through the second passage (P2).

[0030] The housing (3) accommodates the filter (2), the cooler (10), the heater (20), the humidifier (30), and the fan (40). The housing (3) is disposed between the first passage (P1) and the second passage (P2) and communicates with both. Air (A) flows through the housing (3).

[0031] A partition wall (3a) is provided inside the housing (3). The cooler (10) blocks a part of the passage of the air (A) from the filter (2) inside the housing (3). The partition wall (3a) blocks the rest of the passage of the air (A) from the filter (2) inside the housing (3). The air (A) passing through the housing (3) hits either the cooler (10) or the partition wall (3a).

[0032] The cooler (10) allows the air (A) to pass through. The partition wall (3a) is provided with a first damper (80) described below. When the first damper (80) is in an open state, the air (A) can pass through the partition wall (3a).

[0033] The cooling passage (50) passes the air (A) through the cooler (10). The cooling passage (50) is provided in the housing (3). The cooling passage (50) is a passage that starts from the filter (2) in the housing (3), passes through the cooler (10), and reaches just before (upstream of) the heater (20).

[0034] The bypass passage (60) allows the air (A) to bypass the cooler (10) without passing through it. The bypass passage (60) is provided in the housing (3). The bypass passage (60) is a passage that starts from the filter (2) in the housing (3), bypasses the cooler (10), passes through the first damper (80) of the partition wall (3a), and reaches just before (upstream of) the heater (20).

[0035] The confluence passage (70) combines the air (A) passing through the cooling passage (50) and the air (A) passing through the bypass passage (60). The confluence passage (70) passes the combined air (A) through the heater (20) and the humidifier (30), and then supplies the combined air (A) to the test chamber (R) by the fan (40).

[0036] The junction passage (70) is provided in the housing (3). The junction passage (70) is a passage that runs in the housing (3) from just before (upstream side of) the heater (20), passes through the heater (20) and the humidifier (30), and reaches just before (upstream side of) the fan (40). The air (A) that has passed through the junction passage (70) is supplied by the fan (40) through the second passage (P2) to the test chamber (R).

[0037] In this example, the cooling passage (50), the bypass passage (60), and the merging passage (70) are not formed by tangible objects such as pipes, but are formed in the space within the housing (3). Note that the cooling passage (50), the bypass passage (60), and the merging passage (70) may also be formed by pipes, etc.

[0038] The first damper (80) adjusts the bypass flow rate (Q1) of the air (A) flowing through the bypass passage (60). The bypass flow rate (Q1) is an example of a flow rate. The first damper (80) is, for example, a butterfly damper. The first damper (80) adjusts the bypass flow rate (Q1) of the air (A) flowing through the bypass passage (60) continuously or in stages by adjusting the opening degree (F) thereof. The air (A) flows through the bypass passage (60) except when the first damper (80) is fully closed. The greater the opening degree (F) of the first damper (80), the greater the bypass flow rate (Q1), and the smaller the opening degree (F) of the first damper (80), the smaller the bypass flow rate (Q1).

[0039] There is a trade-off between the bypass flow rate (Q1) of the air (A) flowing through the bypass passage (60) and the cooling flow rate (Q2) of the air (A) flowing through the cooling passage (50). The cooling flow rate (Q2) is an example of a flow rate. As the bypass flow rate (Q1) increases, the cooling flow rate (Q2) decreases, and as the bypass flow rate (Q1) decreases, the cooling flow rate (Q2) increases.

[0040] The sum of the bypass flow rate (Q1) of the air (A) flowing through the bypass passage (60) and the cooling flow rate (Q2) of the air (A) flowing through the cooling passage (50) is the total flow rate (Q3) of the air (A) flowing through the junction passage (70). Bypass flow rate (Q1) / total flow rate (Q3)=bypass flow rate (Q1) / (bypass flow rate (Q1)+cooling flow rate (Q2))=bypass factor.

[0041] The temperature sensor (4) is disposed in the second passage (P2) and measures the temperature (T) of the air (A) after it has been conditioned by the air conditioning system (1) and immediately before it is supplied to the test room (R).

[0042] The humidity sensor (5) is disposed in the second passage (P2) and measures the humidity (H) (specifically, relative humidity, absolute humidity, dew point humidity, etc.) of the air (A) after it has been conditioned by the air conditioning system (1) and immediately before it is supplied to the test chamber (R).

[0043] The controller (6) is configured with, for example, a program and a microcomputer. The controller (6) is connected to the temperature sensor (4), the humidity sensor (5), the cold water valve (12), the hot water valve (22), the steam valve (32), and the first damper (80) by wire or wirelessly. The controller (6) sets a set temperature (Ts) and a set humidity (Hs).

[0044] The controller (6) controls the opening (F) of the first damper (80) so that the temperature (T) of the air (A) measured by the temperature sensor (4) (the temperature (T) of the air (A) immediately before it is supplied to the test chamber (R)) approaches the set temperature (Ts) and so that the humidity (H) of the air (A) measured by the humidity sensor (5) (the humidity (H) of the air (A) immediately before it is supplied to the test chamber (R)) approaches the set humidity (Hs).

[0045] Specifically, the controller (6) adjusts the ratio between the bypass flow rate (Q1) of the air (A) flowing through the bypass passage (60) and the cooling flow rate (Q2) of the air (A) flowing through the cooling passage (50) by controlling the opening degree (F) of the first damper (80).

[0046] In addition, the controller (6) controls the opening degree (C) of the cold water valve (12), the opening degree (D) of the hot water valve (22), and the opening degree (E) of the steam valve (32).

[0047] (psychrometric chart) Figure 2 shows a psychrometric chart. The horizontal axis shows the dry-bulb temperature. The dry-bulb temperature corresponds to the temperature (T) of air (A). The unit of dry-bulb temperature (temperature (T)) is [°C]. The vertical axis shows absolute humidity. Absolute humidity is the mass of water vapor contained in air (A), that is, the mass of water vapor contained in 1 [kg] of dry air. The unit of absolute humidity is "kg / kg".

[0048] Relative humidity is the ratio of the actual amount of water vapor to the saturated water vapor amount (saturated vapor line). Relative humidity corresponds to humidity (H). The unit of relative humidity (humidity (H)) is [%]. When relative humidity (humidity (H)) is 100 [%], it corresponds to the saturated water vapor amount. Hereinafter, relative humidity may be simply referred to as humidity (H).

[0049] 1, 2, and 8 plot the first point (X1) to the sixth point (X6). Fig. 2 shows the changes in the temperature (T) and humidity (H) of the air (A) when the bypass passage (60) and the first damper (80) are present. Fig. 8 shows the changes in the temperature (T) and humidity (H) of the air (A) when the bypass passage (60) and the first damper (80) are not present.

[0050] At a first point (X1), air (A) is being sent from a test room (R) through a first passage (P1) to a filter (2) of an air conditioning system (1), and is upstream of a cooler (10). The air (A) at the first point (X1) has a first temperature (T1) and a first humidity (H1).

[0051] At the second point (X2), the air (A) passes through the cooling passage (50) and passes through the cooler (10), where it is cooled and dehumidified in the cooler (10). The air (A) at the second point (X2) has a second temperature (T2) and a second humidity (H2).

[0052] At the third point (X3), the air (A) passes through the bypass passage (60), bypassing the cooler (10) and not being cooled or dehumidified by the cooler (10). The air (A) at the third point (X3) has a third temperature (T3) and a third humidity (H3).

[0053] At the fourth point (X4), the air (A) is passing through the junction passage (70) and has just passed through the heater (20) and been heated by the heater (20) (it has not yet passed through the humidifier (30)). The air (A) at the fourth point (X4) has a fourth temperature (T4) and a fourth humidity (H4).

[0054] At the fifth point (X5), the air (A) is passing through the junction passage (70), has passed through the humidifier (30), and has just been humidified by the humidifier (30). The air (A) at the fifth point (X5) has a fifth temperature (T5) and a fifth humidity (H5).

[0055] At the sixth point (X6), the air (A) is being sent to the test room (R) through the second passage (P2) by the fan (40) of the air conditioning system (1) and is about to be supplied to the test room (R). The air (A) at the sixth point (X6) has a sixth temperature (T6) and a sixth humidity (H6).

[0056] The sixth temperature (T6) is measured by the temperature sensor (4). The sixth humidity (H6) is measured by the humidity sensor (5). The sixth temperature (T6) corresponds to the set temperature (Ts) by the controller (6). The sixth humidity (H6) corresponds to the set humidity (Hs) by the controller (6).

[0057] (Changes in air temperature and humidity when there is no bypass passage or first damper) Changes in the temperature (T) and humidity (H) of the air (A) in the absence of the bypass passage (60) and the first damper (80) will be described with reference to Figures 1 and 8. This case corresponds to the case where the first damper (80) is fixed in a fully closed position.

[0058] The air (A) at the first point (X1) is on its way from the test chamber (R) to the filter (2) through the first passage (P1), and is located upstream of the cooler (10).

[0059] Without the bypass passage (60) and the first damper (80), all of the air (A) at the first point (X1) (first temperature (T1) and first humidity (H1)) passes through the cooler (10), is cooled and dehumidified in the cooler (10), and reaches the second point (X2) (second temperature (T2) and second humidity (H2)).

[0060] The air (A) at the second point (X2) is cooled excessively relative to the sixth temperature (T6) (set temperature (Ts)) at the sixth point (X6). Therefore, the air (A) is heated by the heater (20).

[0061] The air (A) at the second point (X2) (second temperature (T2) and second humidity (H2)) passes through the heater (20) and is heated by the heater (20), and reaches a fourth point (X4) (fourth temperature (T4) and fourth humidity (H4)).

[0062] The air (A) at the fourth point (X4) is dehumidified to an excessive degree relative to the sixth humidity (H6) (set humidity (Hs)) at the sixth point (X6). Therefore, the air (A) is humidified by the humidifier (30).

[0063] The air (A) at the fourth point (X4) (fourth temperature (T4) and fourth humidity (H4)) passes through the humidifier (30) and is humidified by the humidifier (30), and reaches a fifth point (X5) (fifth temperature (T5) and fifth humidity (H5)).

[0064] The air (A) at the fifth point (X5) (fifth temperature (T5) and fifth humidity (H5)) is sent to the second passage (P2) by the fan (40) and reaches the sixth point (X6) (sixth temperature (T6) and sixth humidity (H6)).

[0065] The air (A) at the sixth point (X6) (sixth temperature (T6) and sixth humidity (H6)) is on its way to the test chamber (R) through the second passage (P2) and is about to be supplied to the test chamber (R).

[0066] The fifth temperature (T5) and the sixth temperature (T6) are approximately equal to the set temperature (Ts), and the fifth humidity (H5) and the sixth humidity (H6) are approximately equal to the set humidity (Hs).

[0067] Without the bypass passage 60 and the first damper 80, when adjusting the air A to the set temperature (Ts) and set humidity (Hs) using the air conditioning system 1, the air A that has been excessively cooled and dehumidified by the cooler 10 must be heated by the heater 20 and humidified by the humidifier 30. Heating the air A by the heater 20 and humidifying the air A by the humidifier 30 are wasteful of energy.

[0068] (Changes in air temperature and humidity when there is a bypass passage and a first damper) Changes in the temperature (T) and humidity (H) of the air (A) when the bypass passage (60) and the first damper (80) are present will be described with reference to Figures 1 and 2. Details of the same matters as those in the previous example will not be described again.

[0069] When the bypass passage (60) and the first damper (80) are provided, a portion of the air (A) at the first point (X1) (first temperature (T1) and first humidity (H1)) passes through the cooler (10) via the cooling passage (50), is cooled and dehumidified in the cooler (10), and reaches the second point (X2) (second temperature (T2) and second humidity (H2)).

[0070] When the bypass passage (60) and the first damper (80) are provided, the air (A) at the first point (X1) (first temperature (T1) and first humidity (H1)) bypasses the cooler (10) through the bypass passage (60) and reaches the third point (X3) (third temperature (T3) and third humidity (H3)) without being cooled and dehumidified by the cooler (10).

[0071] The third temperature (T3) of the air (A) at the third point (X3) is approximately equal to the first temperature (T1) of the air (A) at the first point (X1). The third humidity (H3) of the air (A) at the third point (X3) is approximately equal to the first humidity (H1) of the air (A) at the first point (X1).

[0072] The air (A) at a second point (X2) after passing through the cooling passage (50) and the air (A) at a third point (X3) after passing through the bypass passage (60) are joined in a joining passage (70).

[0073] The temperature (T) of the air (A) in the junction passage (70) before being heated by the heater (20) and before being humidified by the humidifier (30) is an intermediate temperature (T23) at an intermediate point (X23) between the second temperature (T2) at the second point (X2) and the third temperature (T3) at the third point (X3).

[0074] The humidity (H) of the air (A) before being heated by the heater (20) and before being humidified by the humidifier (30) in the junction passage (70) becomes an intermediate humidity (H23) at an intermediate point (X23) between the second humidity (H2) at the second point (X2) and the third humidity (H3) at the third point (X3).

[0075] When the cooling flow rate (Q2) is greater than the bypass flow rate (Q1), the intermediate point (X23) is closer to the second point (X2) than to the third point (X3). When the bypass flow rate (Q1) is greater than the cooling flow rate (Q2), the intermediate point (X23) is closer to the third point (X3) than to the second point (X2).

[0076] By controlling the opening (F) of the first damper (80) and appropriately adjusting the ratio between the bypass flow rate (Q1) and the cooling flow rate (Q2), the intermediate temperature (T23) and the intermediate humidity (H23) at the intermediate point (X23) can be made to approach the sixth temperature (T6) (set temperature (Ts)) and the sixth humidity (H6) (set humidity (Hs)) at the sixth point (X6).

[0077] By moving the intermediate point (X23) closer to the sixth point (X6), the heating of the air (A) by the heater (20) and the humidification of the air (A) by the humidifier (30) can be suppressed, which is advantageous in terms of energy saving of the air conditioning system (1).

[0078] (Control Flow) 3 shows a control flow of the first damper (80) of the air conditioning system (1). Starting from the start, in a first step (S1), the operation of the air conditioning system (1) is started based on an operation start command from the user to the controller (6).

[0079] In the second step (S2), the first damper (80) is fully closed, and the opening degree (F) of the first damper (80) is set to 0 [%].

[0080] In a third step (S3), the control of the cold water valve (12), the hot water valve (22), and the steam valve (32) is started.

[0081] The first step (S1) to the third step (S3) may be executed simultaneously.

[0082] In the fourth step (S4), it is determined whether the set temperature (Ts) of the temperature (T) in the laboratory (R) input from the user to the controller (6) is greater than or equal to a predetermined value (Ts1) (Ts≥Ts1?). The set temperature (Ts) is an example of a set value. The predetermined value (Ts1) is an example of a first value. As an example, the predetermined value (Ts1) is 5 [°C].

[0083] When the set temperature (Ts) is greater than or equal to the predetermined value (Ts1) (Ts≥Ts1), the process proceeds to the fifth step (S5). When the set temperature (Ts) is less than the predetermined value (Ts1) (Ts<Ts1), the process returns to the second step (S2).

[0084] When returning to the second step (S2), as described above, the first damper (80) is fully closed. That is, when the set temperature (Ts) of the temperature (T) in the laboratory (R) is less than the predetermined value (Ts1), the first damper (80) is fully closed.

[0085] In the fifth step (S5), the first damper (80) is opened. The opening degree (F) of the first damper (80) is made greater than 0 [%]. When the first damper (80) is opened, the air (A) flows not only through the cooling passage (50) but also through the bypass passage (60).

[0086] In the sixth step (S6), the opening degree (F) of the first damper (80) is adjusted. The ratio of the bypass flow rate (Q1) of the air (A) flowing through the bypass passage (60) to the cooling flow rate (Q2) of the air (A) flowing through the cooling passage (50) is adjusted. The specific embodiment of the sixth step (S6) will be described later. When the sixth step (S6) ends, the process proceeds to the seventh step (S7).

[0087] In the seventh step (S7), it is determined whether an operation stop command has been issued from the user to the controller (6) (Is there a stop command?). If an operation stop command has been issued, the process proceeds to the eighth step (S8). If an operation stop command has not been issued, the process proceeds to the ninth step (S9).

[0088] In the eighth step (S8), the operation of the air conditioning system (1) is stopped. Then, it reaches the end.

[0089] In the ninth step (S9), it is determined again whether the set temperature (Ts) of the temperature (T) in the laboratory (R) input from the user to the controller (6) is greater than or equal to a predetermined value (Ts1) (Ts≧Ts1?).

[0090] When the set temperature (Ts) is greater than or equal to the predetermined value (Ts1) (Ts≧Ts1), the process returns to the sixth step (S6). In the sixth step (S6), the opening degree (F) of the first damper (80) is adjusted again. When the set temperature (Ts) is less than the predetermined value (Ts1) (Ts<Ts1), the process returns to the second step (S2). In the second step (S2), the first damper (80) is closed again.

[0091] Figure 4 shows the adjustment of the opening degree (F) of the first damper (80) in the sixth step (S6). When the opening degree (C) of the cold water valve (12) is smaller than the first opening degree on the cold water side (C1) (C<C1), and (AND) the opening degree (D) of the hot water valve (22) is larger than the first opening degree on the hot water side (D1) (D>D1), after a predetermined time (for example, about 60 [s]) has elapsed, the opening degree (F) of the first damper (80) is increased.

[0092] As an example, the first opening degree on the cold water side (C1) is 80 [%]. As an example, the first opening degree on the hot water side (D1) is 10 [%]. Since the first opening degree on the hot water side (D1) is still larger than 10 [%], there is still room for reduction. As an example, the opening degree (F) of the first damper (80) is increased by 1 [%] every predetermined time (for example, about 30 [s]).

[0093] When the opening degree (C) of the cold water valve (12) is equal to or greater than the second cold water side opening degree (C2) (C≧C2) or (OR) when the opening degree (D) of the hot water valve (22) is equal to or less than the second hot water side opening degree (D2) (D≦D2), the opening degree (F) of the first damper (80) is reduced after a predetermined time (for example, about 30 seconds) has continued (has elapsed).

[0094] As an example, the second cold water side opening degree (C2) is 90%. As an example, the second hot water side opening degree (D2) is 5%. Since the second hot water side opening degree (D2) is already 5% or less, there is no room for further reduction. As an example, the opening degree (F) of the first damper (80) is decreased by 2% every predetermined time (for example, about 30 seconds).

[0095] In addition to the opening degree (C) of the cold water valve (12) and the opening degree (D) of the hot water valve (22), the opening degree (E) of the steam valve (32) may also be used as a condition for adjusting the opening degree (F) of the first damper (80) in the sixth step (S6).

[0096] As the opening degree of each valve, instead of the actual opening degree of each valve, a control input value for adjusting the opening degree of each valve from the controller (6) may be used.

[0097] As a condition for opening the first damper (80), a set humidity (Hs) may be used in addition to or instead of the set temperature (Ts).

[0098] (Action and effect) By controlling the opening degree (F) of the first damper (80) in accordance with the set temperature (Ts) or the set humidity (Hs), it is possible to arbitrarily adjust the ratio between the air (A) that passes through the cooling passage (50) and the cooler (10) to be cooled and dehumidified, and the air (A) that passes through the bypass passage (60) and bypasses the cooler (10) without passing through the cooler (10) to be not cooled and dehumidified.

[0099] The amount of heating of the air (A) by the heater (20) or the amount of humidification of the air (A) by the humidifier (30) for bringing the temperature (T) of the air (A) to the set temperature (Ts) or for bringing the humidity (H) of the air (A) to the set humidity (Hs) can be reduced.

[0100] It is possible to provide an air conditioning system (1) that can achieve energy conservation even when the set temperature (Ts) or set humidity (Hs) is changed arbitrarily.

[0101] When the set temperature (Ts) in the test chamber (R) is lower than a predetermined value (Ts1), the first damper (80) is fully closed, and the air (A) flows entirely through the cooling passage (50) without flowing through the bypass passage (60). When the set temperature (Ts) is low, priority can be given to cooling by the cooler (10).

[0102] Second Embodiment An air conditioning system (1) according to a second embodiment will be described. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description will be omitted. Figure 5 shows the air conditioning system (1).

[0103] The air conditioning system (1) includes a second damper (90). The second damper (90) adjusts the cooling flow rate (Q2) of the air (A) flowing through the cooling passage (50). The second damper (90) is, for example, a butterfly damper. The second damper (90) adjusts the opening (G) of the second damper (90) to continuously or stepwise adjust the cooling flow rate (Q2) of the air (A) flowing through the cooling passage (50).

[0104] The second damper (90) is provided in the cooling passage (50) immediately downstream of the cooler (10). The second damper (90) may be directly connected to the cooler (10).

[0105] The other configurations are the same as those in the first embodiment.

[0106] By controlling not only the opening degree (F) of the first damper (80) but also the opening degree (G) of the second damper (90), the ratio between the bypass flow rate (Q1) of the air (A) flowing through the bypass passage (60) and the cooling flow rate (Q2) of the air (A) flowing through the cooling passage (50) can be adjusted with greater freedom.

[0107] For example, by narrowing the second damper (90) (reducing the opening (G)), the bypass flow rate (Q1) of the air (A) flowing through the bypass passage (60) can be increased.

[0108] <Third embodiment> An air conditioning system (1) according to a third embodiment will be described. In the following description, the same components as those in the above embodiment will be denoted by the same reference numerals, and detailed description will be omitted. Figure 6 shows the air conditioning system (1).

[0109] The air conditioning system (1) does not include a first damper (80) inside the housing (3). The bypass passage (60) is provided outside the housing (3). The bypass passage (60) is formed of a duct. The bypass passage (60) connects the first passage (P1) to a portion of the wall of the housing (3) downstream of the cooler (10) and upstream of the heater (20). One end of the bypass passage (60) communicates with the first passage (P1). The other end of the bypass passage (60) communicates with a portion of the wall of the housing (3) downstream of the cooler (10) and upstream of the heater (20). The bypass passage (60) outside the housing (3) is provided with a first damper (80).

[0110] The other configurations are the same as those in the first embodiment.

[0111] <Fourth embodiment> An air conditioning system (1) according to a fourth embodiment will be described. In the following description, the same components as those in the above-described embodiments will be denoted by the same reference numerals, and detailed description thereof will be omitted. Figure 7 shows the air conditioning system (1).

[0112] The air conditioning system (1) includes a second damper (90). The bypass passage (60) is provided outside the housing (3) and is formed of a duct.

[0113] The other configurations are the same as those of the above embodiment.

[0114] <Other embodiments> Although the embodiments and modifications have been described above, it will be understood that various modifications in form and details are possible without departing from the spirit and scope of the claims. Furthermore, elements of the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate.

[0115] The target space is not limited to the test room (R).

[0116] The terms "first," "second," etc. mentioned above are used to distinguish the terms to which these terms are attached, and do not limit the number or order of the terms. [Explanation of symbols]

[0117] 1. Air conditioning system 2. Filters 3. Housing 3a Partition wall 4 Temperature Sensors 5 Humidity Sensor 6 Controller 10 Cooler 11 Chilled water circuit 12 Cold water valve 20 Heater 21 Hot water circuit 22 Hot water valve 30 Humidifier 31 Steam Line 32 Steam valve 40 fans 50 Cooling passage 60 Bypass Passage 70 Merging Passage 80 First Damper 90 Second damper P1 1st aisle P2 2nd aisle A. Air R Test room (target space) Q1 Bypass flow rate (flow rate) Q2 Cooling flow rate (flow rate) Q3 Total flow rate T temperature Ts Set temperature (set value) Ts1 Predetermined value (first value) H Humidity Hs setting humidity C Opening degree C1 Cold water side 1st opening C2 Cold water side 2nd opening D Opening D1 Hot water side first opening D2 Hot water side 2nd opening degree E Opening F opening G opening

Claims

1. An air conditioning system (1) that supplies air (A) whose temperature (T) and humidity (H) have been adjusted to a target space (R), a cooler (10) for cooling and dehumidifying air (A); a heater (20) for heating the air (A) cooled and dehumidified by the cooler (10); a humidifier (30) that humidifies the air (A) heated by the heater (20); a cooling passage (50) for passing air (A) through the cooler (10); a bypass passage (60) for bypassing the air (A) without passing it through the cooler (10); a confluence passage (70) that merges the air (A) passing through the cooling passage (50) and the air (A) passing through the bypass passage (60), and passes the merged air (A) through the heater (20) and the humidifier (30) to supply the merged air (A) to the target space (R); a first damper (80) that adjusts the flow rate (Q1) of the air (A) flowing through the bypass passage (60). Air conditioning system.

2. a second damper (90) for adjusting the flow rate (Q2) of the air (A) flowing through the cooling passage (50); The air conditioning system of claim 1 .

3. When a set value (Ts) of the temperature (T) in the target space (R) is lower than a first value (Ts1), the first damper (80) is fully closed.

3. The air conditioning system according to claim 1 or 2.

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