Air conditioning system and air conditioning method

Abstract

To provide an air conditioning system and an air conditioning method capable of improving comfort and achieving energy saving.SOLUTION: An air conditioning system 1 according to an embodiment includes radiation air conditioning means 2 and reheating means. The reheating means uses solar radiation S as a heat source, and the air conditioning system 1 controls the radiation air conditioning means 2 and the reheating means on the basis of a situation of the solar radiation S.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an air conditioning system and an air conditioning method. [Background technology]

[0002] Japanese Patent Application Laid-Open Publication No. 2012-127555 describes an air conditioner with integrated radiant air conditioning functions. The air conditioner with integrated radiant air conditioning functions combines a central air conditioning system with a radiant air conditioning system using a radiant panel. The air conditioner with integrated radiant air conditioning functions includes radiant panels, outdoor air conditioning units, and fan coil units (FCUs) located on each floor of a high-rise building. The high-rise building is equipped with a chilled water system for the central air conditioning system, including a chilled water supply pipe and chilled water return pipe, a hot water system for the central air conditioning system, including a hot water supply pipe and hot water return pipe, and multiple branch pipes.

[0003] The outdoor air-conditioning unit and the FCU are each supplied with chilled water via a chilled water supply pipe, branch pipes, and chilled water return pipes, and with hot water via a hot water supply pipe, branch pipes, and hot water return pipes. The chilled water supply pipe, chilled water return pipe, hot water supply pipe, and hot water return pipe are thermally connected to a central heat source in a machine room installed in a high-rise building. The air conditioner with integrated radiant air-conditioning function further includes chilled and hot water system piping, which is a chilled and hot water system for the radiant panel, and a plate heat exchanger.

[0004] The radiant panel is thermally connected to branch pipes, each connected to a chilled water supply pipe, a chilled water return pipe, a hot water supply pipe, and a hot water return pipe, via a plate heat exchanger. Valves are installed in these branch pipes, and a pump and thermostat are installed in the chilled / hot water system piping connecting the radiant panel and the plate heat exchanger. The air conditioner with integrated radiant air conditioning controls the opening of the valve based on the detection signal from the thermostat to adjust the temperature of the chilled / hot water in the chilled / hot water system piping. This adjustment realizes a radiant air conditioning system in which chilled / hot water of a different temperature range than the chilled water and hot water used in a central air conditioning system flows through the chilled / hot water system piping of the radiant panel. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-127555 Summary of the Invention [Problem to be solved by the invention]

[0006] In the case of radiant air conditioning using the aforementioned radiant panels, comfort is required through radiant air conditioning. Furthermore, the aforementioned air conditioner with integrated radiant air conditioning functions supplies hot and cold water using a central heat source installed in a high-rise building. However, in addition to the aforementioned comfort, radiant air conditioning also requires energy conservation through the use of renewable energy.

[0007] An object of the present disclosure is to provide an air conditioning system and an air conditioning method that can improve comfort and achieve energy savings. [Means for solving the problem]

[0008] The air conditioning system according to the present disclosure is an air conditioning system including a radiant air conditioning means and a reheating means, wherein the reheating means uses solar radiation as a heat source, The reheating means includes a solar heat collecting means, and the solar heat collecting means has a hot water storage tank; The air conditioning system is based on the solar radiation situation. , determining whether the amount of solar radiation exceeds a first reference value, and if it is determined that the amount of solar radiation does not exceed the first reference value, in the third control mode, if it is determined that the amount of solar radiation exceeds the first reference value, determining whether the outlet temperature of the hot water storage tank exceeds a second reference value, and if it is determined that the outlet temperature of the hot water storage tank does not exceed the second reference value, in the second control mode, if it is determined that the outlet temperature of the hot water storage tank exceeds the second reference value, in the first control mode, Controlling the radiant air conditioning means and reheating means , re The heat means comprises a solar heat collecting means and an air conditioner coil thermally connected to the solar heat collecting means.

[0009] This air conditioning system, by including a radiant air conditioning unit, can achieve high comfort because temperature unevenness caused by radiant air conditioning is less likely to occur. Furthermore, if only a radiant air conditioning unit is included, outdoor air processing is not possible, and dehumidification and reheating may be necessary in addition to outdoor air processing. Therefore, this air conditioning system is equipped with a reheating unit, allowing dehumidification and reheating to be performed. Furthermore, the air conditioning system controls the radiant air conditioning unit and reheating unit based on the solar radiation conditions. That is, solar radiation is used for dehumidification and reheating, and the radiant air conditioning unit and reheating unit are further controlled according to the solar radiation conditions. Therefore, by utilizing solar radiation, a renewable energy source, while aiming to utilize radiant air conditioning, which provides high comfort, it is possible to reduce the use of fossil fuel-based heat sources and achieve energy savings.

[0010] The air conditioning method according to the present disclosure is an air conditioning method performed by a radiant air conditioning means and a reheat means that uses solar radiation as a heat source, The reheating means includes a solar heat collecting means, and the solar heat collecting means has a hot water storage tank; Based on solar radiation conditions , determining whether the amount of solar radiation exceeds a first reference value, and if it is determined that the amount of solar radiation does not exceed the first reference value, in the third control mode, if it is determined that the amount of solar radiation exceeds the first reference value, determining whether the outlet temperature of the hot water storage tank exceeds a second reference value, and if it is determined that the outlet temperature of the hot water storage tank does not exceed the second reference value, in the second control mode, if it is determined that the outlet temperature of the hot water storage tank exceeds the second reference value, in the first control mode, A step of controlling the radiant air conditioning means and the reheating means. , re The heat means comprises a solar heat collecting means and an air conditioner coil thermally connected to the solar heat collecting means.

[0011] In this air conditioning method, similar to the air conditioning system described above, high comfort can be achieved by the radiant air conditioning means, and dehumidification and reheating can be performed by the reheating means. Furthermore, by controlling the radiant air conditioning means and the reheating means based on the solar radiation conditions, it is possible to utilize solar radiation, a renewable energy, while utilizing the high comfort of radiant air conditioning. Therefore, it is possible to reduce the use of fossil fuel-based heat sources and achieve energy savings. [Effects of the Invention]

[0012] According to the present disclosure, it is possible to improve comfort and achieve energy savings. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram illustrating an example of the configuration of an air conditioning system according to an embodiment. [Figure 2] 3 is a flowchart illustrating an example of steps of an air conditioning method according to the embodiment. [Figure 3] 2 is a diagram schematically illustrating a specific example of the configuration of the hot water tank in the air conditioning system of FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, embodiments of an air conditioning system and an air conditioning method according to the present disclosure will be described with reference to the drawings. Note that the present invention is not limited to the exemplary embodiments described below, but is defined by the claims, and is intended to include all modifications within the scope equivalent to the claims. In the description of the drawings, identical or corresponding elements are designated by the same reference numerals, and redundant description will be omitted as appropriate. Furthermore, the drawings may be partially simplified or exaggerated to facilitate understanding, and dimensional proportions and the like are not limited to those shown in the drawings.

[0015] In this disclosure, "air conditioning" refers to adjusting the temperature or humidity of air in a specified space. "Radiant air conditioning" refers to air conditioning performed by flowing cold or hot water on surfaces that make up a building (for example, ceiling, wall, or floor) to form a radiant surface with a temperature different from that of the body, thereby utilizing the effect of radiation. "Reheating" refers to heating cooled air. In this embodiment, an example will be described in which outside air is cooled to remove excess humidity, and outside air whose temperature has dropped too low is reheated.

[0016] Fig. 1 is a diagram showing the configuration of an air conditioning system 1 according to this embodiment. As shown in Fig. 1, the air conditioning system 1 as an example includes a radiant air conditioning means 2 provided on a surface C that defines a room R of a building, an air conditioner 20 provided in the room R, and a solar heat collecting means 10 that collects heat from solar radiation S.

[0017] The surface C that defines the room R of the building is, for example, the ceiling surface of the room R, and the radiant air-conditioning means 2 includes a plurality of radiant panels provided on the ceiling surface. In this embodiment, the number of radiant panels of the radiant air-conditioning means 2 to be operated and the air conditioner 20 are controlled according to the state of solar radiation S. Note that the room R may be provided with, for example, chilled beams, and the type of equipment provided in the room R can be changed as appropriate. An inlet pipe 2b through which the heat medium flows in, and an outlet pipe 2c through which the heat medium flows out are connected to each radiant panel of the radiant air-conditioning means 2. The air-conditioning system 1 controls the radiant air-conditioning means 2 by supplying the heat medium at a predetermined temperature to each radiant panel via the inlet pipe 2b.

[0018] In this embodiment, the air conditioner 20 functions as an outdoor air conditioning unit (OAU). In this case, the air conditioner 20 takes in air from outside and adjusts the temperature and humidity of the air in the room R.

[0019] As an example, the air conditioner 20 includes fans 22 and 23, and a variable air volume (VAV) unit 21 is connected to the fan 22. For example, the air conditioning system 1 controls the variable air volume unit 21 and the fans 22 and 23 to send air to the room R, and causes the variable air volume unit 21 to adjust the amount of air sent to the room R according to the temperature of the room R.

[0020] For example, the air conditioner 20 includes a coil 24 thermally connected to the solar radiation heat collecting means 10, and a cooling and dehumidifying coil 25. The coil 24 is included in a reheating means that reheats the cooled air in the room R. In this embodiment, the reheating means of the air conditioning system 1 includes the coil 24 and the solar radiation heat collecting means 10.

[0021] The solar radiation collecting means 10 comprises a solar heat collector including a solar heat collection panel 11 that collects solar radiation S, and a hot water storage tank 12. The solar heat collection panel 11 and the hot water storage tank 12 are connected to each other via a pipe P1 through which a heat medium flows, and a pump 13 is provided in the pipe P1. Therefore, the heat obtained by the solar heat collection panel 11 is collected in the hot water storage tank 12 via the pipe P1.

[0022] A pipe P2 extends from the hot water storage tank 12, and a heat exchanger 5 is provided in the pipe P2. Hot water stored inside the hot water storage tank 12 circulates through the pipe P2 in which the heat exchanger 5 is provided. Furthermore, a pipe P3 extending from the coil 24 of the air conditioner 20 is connected to the heat exchanger 5. Therefore, the heat collected by the solar radiation heat collecting means 10 is transferred to the coil 24 of the air conditioner 20 via the hot water storage tank 12 and the heat exchanger 5.

[0023] 3 shows an example of the detailed structure of the hot water tank 12. The hot water tank 12 has, for example, a solar heat collection section 12b that collects heat from the solar heat collection panel 11, and a heat supply section 12c that supplies heat to the air conditioner 20 (for example, an outdoor air-conditioning system, secondary side). The hot water tank 12 has a two-tank structure having the solar heat collection section 12b and the heat supply section 12c, and a partition plate 12d is interposed between the solar heat collection section 12b and the heat supply section 12c. The solar heat collection section 12b and the heat supply section 12c are connected to each other via a pipe, and the partition plate 12d that separates the solar heat collection section 12b and the heat supply section 12c is, for example, a steel plate.

[0024] 1, the pipe P3 is provided with a heat medium flow rate adjuster 3 including a pair of headers H and a plurality of pumps 3b. However, the pipe P3 may be connected to, for example, a heat source other than the heat medium flow rate adjuster 3, and the configuration of the equipment provided in the pipe P3 is not limited to the heat medium flow rate adjuster 3 and can be changed as appropriate. The configuration of the equipment provided in the pipe P1 and the configuration of the equipment provided in the pipe P2 can also be changed as appropriate.

[0025] Next, an example of an air conditioning method according to this embodiment will be described with reference to Figures 1 and 2. Figure 2 is a flowchart showing an example of steps of the air conditioning method according to this embodiment. First, the air conditioning system 1 determines whether it is within an air conditioning time slot (step S1). At this time, it is determined whether the current time is within a preset air conditioning time slot (for example, from 8:00 AM to 6:00 PM).

[0026] If it is determined that the current time is not the air conditioning time slot, the process proceeds to step S2, where the air conditioner 20 is turned off, and the series of steps ends. If it is determined in step S1 that the current time is the air conditioning time slot, the air conditioning system 1 determines whether or not the current time is the air conditioning startup time slot (step S3). The air conditioning startup time indicates, for example, the time slot during which the room R is cooled in advance, and in step S3, it is determined whether or not the current time is the air conditioning startup time slot.

[0027] If it is determined that it is the air conditioning startup period (YES in step S3), the process proceeds to step S4 and the radiant air conditioning means 2 (ceiling radiation in this embodiment) is turned off. Then, for example, the supply air temperature of the outdoor air conditioning unit may be controlled so that the room temperature becomes the set value. Also, if it is the air conditioning startup period, return air may be introduced without taking in outside air, and the air conditioner 20 may perform air conditioning in the room R. In this case, it is possible to further improve energy conservation and to start up quickly. Then, the series of steps ends. Also, if it is determined that it is not the air conditioning startup period (NO in step S3), the process proceeds to step S5.

[0028] In step S5, the air conditioning system 1 determines whether the amount of solar radiation exceeds a reference value (a step of controlling the radiant air conditioning means and the reheating means based on the solar radiation conditions). It may be determined whether the predicted value of the amount of solar radiation exceeds a reference value, rather than the actual amount of solar radiation. For example, the air conditioning system 1 determines whether the measured value of the amount of solar radiation (or the predicted value of the amount of solar radiation) by the solar radiation collecting means 10 exceeds a reference value. The reference value in step S5 is, for example, 500 kW / m 2 is.

[0029] If it is determined in step S5 that the reference value is not exceeded, the process proceeds to step S6, and the third control mode is executed, for example. In the third control mode, the solar heat utilization rate by the solar radiation heat collecting means 10 is determined to be "low," and, for example, priority control of the air conditioner 20 is performed. In the third control mode, from the perspective of energy conservation, the amount of reheat by the reheat means is suppressed, and the number of operating radiant panels of the radiant air conditioning means 2 is minimized. "Minimum" means, for example, about 20% of the total number of radiant panels. Furthermore, the discharge air temperature of the air conditioner 20 may be varied depending on the operating status of the variable air volume unit 21, and the supply air temperature may be reset. After going through the above third control mode, the series of processes is completed.

[0030] If it is determined in step S5 that the temperature exceeds the reference value, the process proceeds to step S7. In step S7, it is determined whether the temperature of the hot water in hot water tank 12 exceeds the reference value. For example, it is determined whether the outlet temperature of hot water tank 12 (the temperature of the outlet portion of hot water tank 12 on the side of pipe P2) exceeds the reference value.

[0031] The reference value in step S7 is, for example, 30° C. or more and 35° C. or less. It may be determined whether or not the predicted value of the outlet temperature of hot water storage tank 12 exceeds the reference value, rather than the actual outlet temperature of hot water storage tank 12. If it is determined that the outlet temperature of hot water storage tank 12 does not exceed the reference value, the process proceeds to step S8, and, for example, the second control mode is executed.

[0032] In the second control mode, the solar heat utilization rate by the solar radiation heat collecting means 10 is determined to be "medium," and, for example, the number of operating radiant panels of the radiant air-conditioning means 2 is set to a medium level. "Medium" means, for example, about 50% of the total number of radiant panels. Furthermore, the blown air temperature of the air conditioner 20 is set to a standard value -t (°C). The standard value is, for example, 24 (°C). t is a real number, and is, for example, 2 (°C). However, the value of t can be changed as appropriate. After going through the above second control mode, the series of processes is completed.

[0033] If it is determined in step S7 that the outlet temperature of the hot water storage tank 12 exceeds the reference value, the process proceeds to step S9, and the first control mode is executed, for example. In the first control mode, the solar heat utilization rate by the solar heat collecting means 10 is determined to be "high," and, for example, the number of operating radiant panels of the radiant air-conditioning means 2 is set to the maximum. The "maximum" refers to, for example, the total number of radiant panels. Furthermore, in the first control mode, since reheating by the reheating means can be covered by solar heat, the blown air temperature of the air conditioner 20 is set to the standard value (24°C, for example) described above. After going through the first control mode described above, the series of processes is terminated.

[0034] Next, the effects obtained from the air conditioning system 1 and air conditioning method according to this embodiment will be described. The air conditioning system 1 and air conditioning method according to this embodiment are equipped with a radiant air conditioning unit 2, which reduces temperature unevenness caused by radiant air conditioning, thereby achieving high comfort. Furthermore, if only the radiant air conditioning unit 2 is equipped, outdoor air processing is not possible, and dehumidification and reheating may be required in addition to outdoor air processing. Therefore, the air conditioning system 1 and air conditioning method according to this embodiment control the radiant air conditioning unit 2 and reheating unit based on the solar radiation S status. That is, solar radiation S is used for dehumidification and reheating, and the radiant air conditioning unit 2 and reheating unit are further controlled according to the solar radiation S status. Therefore, by utilizing solar radiation S, a renewable energy source, while utilizing radiant air conditioning, which provides high comfort, it is possible to reduce the use of fossil fuel-based heat sources and achieve energy savings.

[0035] The air conditioning system 1 according to this embodiment includes solar radiation heat collecting means 10 as reheating means, and the solar radiation heat collecting means 10 is provided with a hot water storage tank 12. By providing the hot water storage tank 12 in this manner, heat obtained from solar radiation S can be effectively stored in the hot water storage tank 12, making it easy to control the temperature using the reheating means.

[0036] In this embodiment, one of the first, second, and third control modes is selected according to the amount of solar radiation and the temperature of the hot water tank 12, and the number of radiant panels to operate and the air conditioner 20 are controlled. Therefore, when reheating the cooled room R (for example, dehumidification reheating) if sufficient heat can be obtained from the solar radiation S, as many radiant panels as possible can be operated. This contributes to further energy savings by increasing the solar heat utilization rate as much as possible, taking into account the amount of solar radiation, etc. Furthermore, when the amount of solar radiation exceeds a standard value, more radiant panels are operated compared to when the amount of solar radiation is below the standard value. This makes it possible to further improve comfort achieved by radiant air conditioning.

[0037] In this embodiment, as described above, it may be determined whether the predicted value of the amount of solar radiation exceeds the reference value, and it may be determined whether the predicted value of the outlet temperature of the hot water storage tank 12 exceeds the reference value. By determining whether the predicted value exceeds the reference value in this way, it becomes possible to perform predictive control of the radiant air-conditioning means and the reheating means.

[0038] The above describes embodiments of the air conditioning system and air conditioning method according to the present disclosure. However, the present disclosure is not limited to the above-described embodiments, and may be modified or applied to other things without departing from the spirit of the claims. In other words, the configuration, number, and arrangement of each part of the air conditioning system, as well as the content and order of the steps of the air conditioning method, may be modified as appropriate without departing from the spirit of the present disclosure.

[0039] For example, in the above-described embodiment, a radiant air-conditioning means 2 including a plurality of radiant panels provided on a ceiling surface was described. However, the air-conditioning system according to the present disclosure may also include a radiant air-conditioning means including radiant panels provided on a wall or floor surface. That is, the location where the radiant air-conditioning means is provided may be a wall, a floor, or the like, and can be changed as appropriate. The radiant air-conditioning means may involve convection. Furthermore, in the above-described embodiment, an example including one hot water storage tank 12 was described. However, the air-conditioning system according to the present disclosure may include a plurality of hot water storage tanks 12, or the hot water storage tank 12 may be omitted.

[0040] In the above embodiment, an example has been described in which the reheating means uses solar radiation S as a heat source. However, the reheating means may also use a heat source other than solar radiation. For example, a heat source other than solar radiation may be connected to at least one of the pipe P1 in which the solar heat collection panel 11 is provided and the pipe P2 in which the hot water tank 12 is provided.

[0041] In the above-described embodiment, an example has been described in which the air conditioning system 1 determines whether the amount of solar radiation and the temperature of the hot water tank 12 each exceed a reference value in steps S5 and S7. However, an air conditioning method in which either step S5 or step S7 is omitted may also be used. That is, the air conditioning system 1 may determine only whether the amount of solar radiation exceeds a reference value. Alternatively, the air conditioning system 1 may determine only whether the temperature of the hot water tank 12 exceeds a reference value. In this case, the amount of solar radiation is not determined directly, but the solar radiation status is determined from the temperature of the hot water tank 12 that collects solar heat. In this way, the solar radiation status may be determined indirectly.

[0042] In the above-described embodiment, an air conditioner 20 including fans 22, 23 and coils 24, 25 was described as an example. However, the configuration of the air conditioner 20 is not limited to this example and can be modified as appropriate. For example, the air conditioner 20 may be one that constantly introduces return air. In this case, outside air may be blocked during the above-described air conditioning startup period. Also, an air conditioner that does not function as an outdoor air conditioner may be provided. Furthermore, in the above-described embodiment, an air conditioning system 1 including a heat exchanger 5 that exchanges heat between the heat medium in the pipe P2 extending from the hot water storage tank 12 and the heat medium in the pipe P3 extending from the air conditioner 20 was described. However, the air conditioning system according to the present disclosure may be an air conditioning system including multiple heat exchangers 5, or may be an air conditioning system without a heat exchanger 5. [Explanation of symbols]

[0043] 1...air conditioning system, 2...radiant air conditioning means, 2b...inlet pipe, 2c...outlet pipe, 3...heat medium flow rate adjustment section, 3b...pump, 5...heat exchanger, 10...solar heat collection means (reheat means), 11...solar heat collection panel, 12...hot water storage tank, 12b...solar heat collection section, 12c...heat supply section, 12d...partition plate, 13...pump, 20...air conditioner, 21...variable air volume unit, 22, 23...fan, 24...coil (reheat means), 25...coil, C...surface, H...header, P1, P2, P3...pipe, R...room, S...solar radiation.

Claims

1. An air conditioning system equipped with a radiant air conditioning means and a reheat means, the reheating means uses solar radiation as a heat source; The reheating means includes a solar heat collecting means, and the solar heat collecting means has a hot water storage tank, The air conditioning system, based on the solar radiation situation, It is determined whether or not the amount of solar radiation exceeds a first reference value, and when it is determined that the amount of solar radiation does not exceed the first reference value, in a third control mode, When it is determined that the amount of solar radiation exceeds the first reference value, it is determined whether or not the outlet temperature of the hot water storage tank exceeds a second reference value, and when it is determined that the outlet temperature of the hot water storage tank does not exceed the second reference value, in a second control mode, When it is determined that the outlet temperature of the hot water storage tank exceeds the second reference value, in a first control mode, Controlling the radiant air conditioning means and the reheating means; The reheating means includes the solar radiation collecting means and an air conditioner coil thermally connected to the solar radiation collecting means. Air conditioning system.

2. An air conditioning method performed by a radiant air conditioning means and a reheat means using solar radiation as a heat source, The reheating means includes a solar radiation collecting means, and the solar radiation collecting means includes a hot water storage tank; Based on the solar radiation situation, It is determined whether or not the amount of solar radiation exceeds a first reference value, and when it is determined that the amount of solar radiation does not exceed the first reference value, in a third control mode, When it is determined that the amount of solar radiation exceeds the first reference value, it is determined whether or not the outlet temperature of the hot water storage tank exceeds a second reference value, and when it is determined that the outlet temperature of the hot water storage tank does not exceed the second reference value, in a second control mode, When it is determined that the outlet temperature of the hot water storage tank exceeds the second reference value, in a first control mode, controlling the radiant air conditioning means and the reheating means; The reheating means includes the solar radiation heat collecting means and an air conditioner coil thermally connected to the solar radiation heat collecting means. Air conditioning method.

Images