JP2008202838A - Building frame heat storage air conditioning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a building frame heat storage air conditioning method capable of storing a large amount of heat without generating dew condensation. <P>SOLUTION: In storing heat in a building frame 12 by supplying cooling air to the frame 12 constituting a ceiling of an air-conditioned room 20, dehumidification air-conditioning is performed in an air-conditioned room 40 where the frame 12 is applied as a floor surface. Here, a surface temperature of the frame 12 is measured in the air-conditioned room 40, and the temperature and humidity in the air-conditioned room 40 are measured to perform dehumidification air-conditioning on the basis of the measured values. Further the air conditioning is performed so that the internal pressure of the air-conditioned room 40 is higher than the outside atmospheric pressure. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a housing heat storage air conditioning method, and more particularly to a housing heat storage air conditioning method for an office building or the like.

In recent years, building heat storage air conditioning systems are used for building air conditioning from the viewpoint of energy saving measures. The thermal storage air conditioning system is a system that reduces the air conditioning load during the daytime by cooling and storing the building housing at night when the electricity rate is low. For example, the air conditioner installed in the ceiling space can be used to reduce the ceiling slab at night. Cooling. Thereby, since cold heat is radiated from the ceiling slab in the daytime, the daytime cooling load is reduced, and the running cost of the air conditioning can be reduced.
JP 2000-157964 A JP 2005-161226 A

  However, in the conventional frame heat storage air conditioning system, there is a possibility that condensation occurs on the floor surface of the upper floor of the slab where the heat storage is performed, and the electric equipment or the like may break down. For this reason, in the conventional housing heat storage air conditioning system, there was a problem that the housing could not be cooled so much and a large amount of heat storage could not be stored.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a housing heat storage air-conditioning method capable of storing a large amount of heat storage without causing condensation.

  In order to achieve the above object, the invention according to claim 1 is a housing heat storage air-conditioning method in which cooling air is blown onto the housing forming the ceiling of the first air-conditioned room to store heat in the housing, and the heat storage operation of the housing is performed. In some cases, dehumidifying air conditioning is performed in a second air-conditioned room having the casing as a floor surface.

  According to the first aspect of the present invention, since the heat storage operation of the housing is performed and the dehumidifying air conditioning is performed in the second air-conditioned room above the housing, it is possible to prevent dew condensation from occurring in the second air-conditioned room. . Therefore, the housing can be cooled more than before, and the heat storage amount of the housing can be increased.

  According to a second aspect of the present invention, in the first aspect of the invention, the surface temperature of the housing on the second air-conditioned room side at the cooling air blowing position is measured, and the second air-conditioned room is measured. The dew point temperature inside is obtained, and the dehumidifying air conditioning is controlled based on the dew point temperature and the surface temperature.

  According to the second aspect of the present invention, the surface temperature having the lowest temperature in the second air-conditioned room is measured during the heat storage operation, and the dew point temperature in the second air-conditioned room is obtained. Since the dehumidifying operation is controlled by comparing with the temperature, dew condensation can be prevented while minimizing the dehumidifying operation.

  According to a third aspect of the present invention, in the second aspect of the invention, the change in the surface temperature is predicted and the change in the dew point temperature is predicted, so that the predicted surface temperature is higher than the predicted dew point temperature. The dehumidifying air conditioning is controlled.

  According to the invention of claim 3, since the dehumidifying air conditioning is controlled by predicting the surface temperature and the dew point temperature, it is possible to more reliably prevent the occurrence of condensation.

  According to a fourth aspect of the present invention, there is provided a housing heat storage air conditioning method in which cooling air is blown to a housing forming a ceiling of the first air-conditioned room to store heat in the housing in order to achieve the object. In some cases, air conditioning is performed such that the internal pressure of the second air-conditioned room having the casing as a floor surface is greater than atmospheric pressure.

  According to the fourth aspect of the present invention, by air-conditioning the internal pressure of the second air-conditioned room to be greater than the atmospheric pressure, high humidity outside air is prevented from entering the second air-conditioned room. be able to. Therefore, the inside of the second air-conditioned room can be kept at a low humidity, and condensation can be prevented from occurring in the second air-conditioned room. Thereby, a housing can be cooled rather than before and the amount of heat storage of a housing can be enlarged.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, by supplying dehumidified air to the second air-conditioned room, the internal pressure of the second air-conditioned room is made larger than the atmospheric pressure. It is characterized by.

  According to the present invention, since the dehumidifying air conditioning is performed in the second air-conditioned room or the internal pressure of the second air-conditioned room is set to be greater than the atmospheric pressure during the heat storage operation of the housing, Condensation can be prevented from occurring in the air conditioning room, and the housing can be cooled more than before to increase the amount of heat storage.

  A preferred embodiment of a housing heat storage air conditioning method according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view schematically showing a first embodiment of an air conditioning system 10 to which a housing heat storage air conditioning method according to the present invention is applied. The building shown in the figure is provided with two air-conditioned rooms 20 and 40 that are partitioned vertically by a concrete frame 12. The casing 12 forms the ceiling of the air-conditioned room 20 and constitutes the floor surface of the air-conditioned room 40.

  The upper part of the air-conditioned room 20 is partitioned by a ceiling member 22, and a ceiling back space 24 is formed. An indoor unit 26 for air-conditioning the air-conditioned room 20 is provided in the ceiling space 24. The indoor unit 26 is connected to an outdoor outdoor unit 28, and is configured to cool and blow out air by circulating a heat medium between the indoor unit 26 and the outdoor unit 28. A duct 30 is connected to the air outlet of the indoor unit 26, and this duct 30 is connected to a switching damper 32. The switching damper 32 is connected to an air outlet 34 provided in the ceiling member 22 and an air outlet 36 opened toward the ceiling housing 12, and selects one of the air outlet 34 and the air outlet 36. Then, switching control is performed so as to communicate with the indoor unit 26. Therefore, the indoor unit 26 can be connected to the air outlet 34 during normal air-conditioning operation during the daytime, and cooling air can be supplied to the air-conditioned room 20, and the indoor unit 26 can be connected to the air outlet 36 during heat storage operation at night. Then, the cooling air can be blown onto the housing 12.

  The ceiling member 22 has exhaust ports 38 and 38, and air in the air-conditioned room 20 is sucked into the ceiling back space 24 from the exhaust ports 38 and 38 during normal air conditioning operation. And after cooling by the indoor unit 26, it blows off from the blower outlet 34. FIG.

  Although omitted in FIG. 1, an outside air processing device that air-conditions outside air and supplies the air-conditioned room 20 may be provided.

  On the other hand, the upper part of the air-conditioned room 40 is partitioned by a ceiling member 42 to form a ceiling back space 44. An indoor unit 46 for air-conditioning the air-conditioned room 40 is provided in the ceiling space 44. The indoor unit 46 is connected to an outdoor outdoor unit 48 and is configured to cool and blow out air by circulating a heat medium between the indoor unit 46 and the outdoor unit 48.

  An air supply port 50 and an exhaust port 52 are provided in the ceiling member 42 of the air-conditioned room 40. An air supply duct 54 is connected to the air supply port 50, and an exhaust duct 56 is connected to the exhaust port 52. The air supply duct 54 and the exhaust duct 56 are connected to an outside air processing device 60 in the maintenance chamber 58. The outside air processing device 60 sucks air from the exhaust duct 56 and adjusts temperature and humidity to supply the air duct 54. Configured to insufflate. Thereby, the air in the air-conditioned room 40 can be circulated to the outside air processing device 60 to adjust the temperature and humidity in the air-conditioned room 40.

  The outside air processing device 60 is connected to the outside air inlet 64 via the outside air duct 62. Accordingly, the outside air can be taken into the outside air processing device 60, and the temperature and humidity of the outside air can be adjusted to supply air to the air-conditioned room 40. The exhaust duct 56 and the outside air duct 62 are provided with dampers 66 and 68, respectively, so that the exhaust amount and the outside air intake amount can be adjusted.

  The air-conditioned room 40 is provided with a surface temperature sensor 70 that measures the surface temperature of the housing 12. The surface temperature sensor 70 is provided on the opposite side of the cooling air blowing position from the blower outlet 36. Thereby, when cooling body is blown out from the blower outlet 36 and the housing 12 is cooled, the lowest temperature in the air-conditioned room 40 can be measured.

  The air-conditioned room 40 is provided with a temperature / humidity sensor 72 for measuring temperature and humidity. The temperature / humidity sensor 72 may be any sensor that can determine the dew point temperature. For example, an optical dew point temperature sensor may be used.

  Further, a pressure sensor 74 is provided inside the air-conditioned room 40 and, together with a pressure sensor 76 provided outside the air-conditioned room 40, detects a slight differential pressure between the internal pressure of the air-conditioned room 40 and the atmospheric pressure. It can be done.

  The surface temperature sensor 70, the temperature / humidity sensor 72, and the pressure sensors 74 and 76 described above are connected to the controller 78. The controller 78 is connected to the outside air processing device 60 and is configured to control the driving of the outside air processing device 60 based on the measurement values of the sensors 70, 72, 74, 76. Specifically, first, the change in the surface temperature is predicted from the measured value of the surface temperature sensor 70 and the data during the past heat storage operation. On the other hand, while calculating dew point temperature from the measured value of the temperature / humidity sensor 72, the change of dew point temperature is estimated from the data at the time of the past dehumidification operation. And dehumidification air conditioning is performed by controlling the drive of the outside air processing device 60 so that the predicted value of the surface temperature is always higher than the predicted value of the dew point temperature. Thereby, in the air-conditioned room 40, since the surface temperature is always higher than the dew point temperature, the occurrence of condensation can be prevented.

  Further, the measured values of the pressure sensors 74 and 76 are compared during the heat storage operation, and when the internal pressure of the air-conditioned room 40 is lower than the atmospheric pressure, the damper 68 of the external air processing device 60 is opened to determine the intake amount of the external air. The outside air processing device 60 is controlled so that the internal pressure of the air-conditioned room 40 becomes larger than the atmospheric pressure. Thereby, in the air-conditioned room 40, since it is always higher than the atmospheric pressure, it is possible to prevent outside air having high humidity from entering the air-conditioned room 40 from the outside, and to keep the air-conditioned room 40 at a low humidity at all times. Can do. Even if the internal pressure of the air-conditioned room 40 is higher than the atmospheric pressure, if the preset upper limit value is exceeded, the opening degree of the damper 68 is reduced to reduce the intake amount of outside air. .

  Next, the housing heat storage air conditioning method of the air conditioning system 10 configured as described above will be described. FIG. 2 shows a flow when switching from normal air conditioning operation to heat storage operation.

  As shown in the figure, first, it is determined whether or not the condition for starting the heat storage operation (in this embodiment, the scheduled start time of the heat storage operation) is reached (step S1). And when it becomes the conditions which start a thermal storage driving | operation, the switching damper 32 of FIG. 1 is switched and a thermal storage driving | operation is started (step S2). That is, the cooling air from the indoor unit 26 is blown to the housing 12, and cold energy is stored in the housing 12. At that time, the cooling air blown to the housing 12 is controlled to a constant temperature and a constant air volume so that a desired heat storage amount is obtained at the scheduled end time of the heat storage operation.

  During the heat storage operation, the controller 78 predicts the fluctuation of the surface temperature from the measured value of the surface temperature sensor 70 and the past heat storage operation data. Further, the controller 78 calculates the dew point temperature from the measured value of the temperature / humidity sensor 72 and predicts the fluctuation of the dew point temperature from the past heat storage operation data. Then, the controller 78 compares the predicted dew point temperature value Td with the predicted surface temperature value Ts (step S3), and controls the outside air processing device 60 so that Ts is always higher than Td. That is, when Ts is predicted to be lower than Td, dehumidifying air conditioning is performed by driving the outside air processing device 60 (step S4). Thereby, since the dehumidified air is supplied to the air-conditioned room 40, the dew point temperature can be lowered, and the surface temperature can always be kept higher than the dew point temperature. By controlling the dew point temperature to be always higher than the surface temperature in this way, it is possible to prevent dew condensation from occurring in the air-conditioned room 40.

  Further, the controller 78 compares the internal pressure of the air-conditioned room 40 with the atmospheric pressure (external pressure) during the heat storage operation (step S5), and if the internal pressure of the air-conditioned room 40 is lower than the atmospheric pressure, the external air processing device. The 60 dampers 68 are opened to increase the intake amount of outside air (step S6). Thereby, the internal pressure of the air-conditioned room 40 can be increased, and the internal pressure of the air-conditioned room 40 can be maintained in a state higher than the atmospheric pressure. Therefore, it is possible to prevent outside air with high humidity from entering the air-conditioned room 40 from the outside, and to keep the air-conditioned room 40 at a low humidity.

  Thus, this Embodiment can prevent that dew condensation occurs in the air-conditioned room 40 by performing the dehumidifying operation of the air-conditioned room 40 with the outside air processing device 60 during the heat storage operation. In addition, since the present embodiment prevents the high-humidity outside air from entering the air-conditioned room 40 by increasing the internal pressure of the air-conditioned room 40 above the atmospheric pressure during the heat storage operation, dew condensation occurs in the air-conditioned room 40. Occurrence can be prevented. Therefore, according to the present embodiment, the temperature of the housing 12 can be greatly reduced during the heat storage operation and the amount of heat storage can be increased, so that the running cost can be reduced as compared with the conventional case.

  The heat storage operation is performed as described above, and the heat storage operation is ended when the heat storage operation end condition (for example, time, amount of heat storage, etc.) is reached, and the operation is switched to the normal air conditioning operation (step S7). That is, the switching damper 32 is switched so that the cooling air from the indoor unit 26 is supplied to the air-conditioned room 20. At that time, air in the air-conditioned room 20 is sucked into the ceiling back space 24 from the exhaust port 38 and the cold heat stored in the housing 12 is radiated.

  FIG. 3 is a cross-sectional view schematically showing the configuration of the air conditioning system of the second embodiment. As shown in the figure, the lower part of the air-conditioned room 40 is partitioned by a floor surface forming member 82 to form an underfloor space 84. The outside air processing device 60 is connected to the underfloor space 84 via the duct 86 so as to supply conditioned air to the underfloor space 84. A plurality of openings 88 and 88 are formed in the underfloor space 84, and air in the underfloor space 84 is supplied to the air-conditioned room 40 through the openings 88 and 88.

  According to the second embodiment configured as described above, the dehumidified air dehumidified by the outside air processing device 60 is supplied to the underfloor space 84 during the heat storage operation. Therefore, since the dehumidified air is directly supplied to the underfloor space 84 where the temperature decreases most during the heat storage operation, it is possible to more reliably prevent the occurrence of condensation.

  FIG. 3 shows an example in which the air in the building is exhausted by the exhaust fans 90 and 90. The exhaust fans 90, 90 are provided in a toilet or the like and are normally driven for 24 hours. In the case of a building having such an exhaust fan 90, the exhaust fan 90 and the outside air processing device 60 are interlocked so that the internal pressure of the air-conditioned room 40 is always higher than the atmospheric pressure.

  Further, FIG. 3 shows an example in which the exhaust fan 90 is communicated with the communication shaft 92 that is blown through on the floor of the air-conditioned room 20 that performs the heat storage operation. In this way, by exhausting excess air from other floors on the floor where the heat storage operation is performed, the thermal efficiency in the heat storage can be increased.

  In the first and second embodiments described above, the outside air processing device 60 is driven to perform the dehumidifying operation. However, the indoor unit 46 and the outdoor unit 48 are driven to set the second air-conditioned room 40. You may dehumidify and air-condition.

  In the first and second embodiments described above, the dehumidifying air conditioning is controlled based on the predicted surface temperature value and the predicted dew point temperature. However, the present invention is not limited to this, and the dehumidifying air conditioning is always performed. Or may be periodically dehumidified and air-conditioned based on past heat storage operation data.

  In the first and second embodiments described above, the heat storage operation is performed on only one floor, but the heat storage operation may be performed on a plurality of floors. In this case, the dehumidifying air conditioning may be performed on the upper floor for all the floors that perform the heat storage operation.

  Furthermore, in the first and second embodiments described above, heat storage is started at a predetermined heat storage start time. However, when the heat storage start time is delayed due to various reasons such as overtime, the following heat storage amount is ensured. You should drive.

  FIG. 4 shows an example of the control that performs the heat storage amount securing operation. In the figure, the solid line indicates an example in which heat storage is performed so that the target heat storage amount (that is, the heat storage amount is 100%) in 10 hours from the predetermined heat storage operation start time (0h), and the two dotted lines are the heat storage operation. An example in which the time is delayed by about 2 hours and about 3 hours is shown.

  When the heat storage start time is delayed, first, the controller 78 calculates the temperature and air volume of the cooling air as constant values so that the target heat storage amount (100%) is reached at the initial heat storage end time (that is, after 10 hours). The controller 78 controls the indoor unit 26 and the outdoor unit 28 so as to achieve the calculated temperature and air volume. That is, by controlling the compressor in the outdoor unit 28 to increase the circulation amount of the heat medium, the temperature of the cooling air is lowered, or by increasing the rotational speed of the fan in the indoor unit 26, the air volume of the cooling air Or increase. Thereby, the time course curve (dotted line) of the heat storage amount becomes larger than the initial schedule (solid line), and is controlled so as to reach the target heat storage amount (100%) at the initial heat storage amount end time (after 10 hours). .

  Thus, by calculating the optimum values of the temperature and the air volume of the cooling air blown to the housing 12 and controlling them to the optimum values, it is possible to perform the energy saving operation while reliably ending the heat storage amount in the initial schedule. .

  FIG. 5 shows an example of the heat storage amount securing operation different from FIG. In the figure, the solid line is an example in which heat storage is started at the initial heat storage start time (0h), and the dotted lines are examples in which heat storage is started with a delay of about 2 hours and about 3 hours, respectively.

  When the heat storage start time is delayed, first, the heat storage operation is started with the heat storage capacity maximized. That is, by controlling the compressor in the outdoor unit 28 to maximize the circulation amount of the heat medium to reduce the temperature of the cooling air, or to increase the rotational speed of the fan in the indoor unit 26, the air volume of the cooling air is reduced. Or increase it. Thereby, the time course curve (dotted line) of the heat storage amount becomes larger than the initial schedule (solid line) and approaches the original schedule (solid line).

  Next, as the original schedule (solid line) is approached, the heat storage capacity (cooling air temperature and air flow rate) is gradually returned to the original (solid line) control value. That is, the initial control value is restored by increasing the temperature of the cooling air or decreasing the air volume of the cooling air. Thereby, the time course curve (dotted line) of the heat storage amount overlaps the original schedule (solid line), and the heat storage is completed as originally planned.

  By performing the heat storage amount securing operation as described above, even when the heat storage start time is delayed, the desired heat storage amount can be secured at the initial scheduled end time, and the operation is stable because it overlaps the initial control. It can be performed.

Sectional drawing which shows typically 1st Embodiment of the air-conditioning system to which this invention is applied. Flow diagram showing the thermal storage air conditioning method Sectional drawing which shows typically 2nd Embodiment of the air-conditioning system to which this invention is applied. Thermal storage amount change over time showing an example of heat storage amount securing operation Thermal storage amount change over time showing an example of heat storage amount securing operation

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Air conditioning system, 12 ... Housing, 20 ... Air-conditioned room, 22 ... Ceiling member, 24 ... Ceiling space, 26 ... Indoor unit, 28 ... Outdoor unit, 32 ... Switching damper, 34, 36 ... Air outlet, 40 ... Air-conditioned room, 42 ... ceiling member, 44 ... ceiling space, 46 ... indoor unit, 48 ... outdoor unit, 50 ... air supply port, 52 ... exhaust port, 60 ... outside air treatment device, 66, 68 ... damper, 70 ... Surface temperature sensor 72 ... Temperature / humidity sensor 74, 76 ... Pressure sensor 78 ... Controller 82 ... Floor surface forming member 84 ... Underfloor space 90 ... Exhaust fan

Claims (5)

In a housing heat storage air-conditioning method for storing heat in the housing by blowing cooling air to the housing forming the ceiling of the first air-conditioned room,
A housing heat storage air-conditioning method, wherein dehumidifying air conditioning is performed in a second air-conditioned room having the housing as a floor during the heat storage operation of the housing.   The surface temperature of the enclosure on the second air-conditioned room side at the cooling air blowing position is measured, the dew point temperature inside the second air-conditioned room is determined, and the dew point temperature and the surface temperature The housing heat storage air-conditioning method according to claim 1, wherein the dehumidifying air-conditioning is controlled on the basis of the temperature.   The dehumidification air-conditioning is controlled so that the change in the dew point temperature is predicted while the change in the surface temperature is predicted, and the predicted surface temperature is higher than the predicted dew point temperature. The enclosure thermal storage air conditioning method described. In a housing heat storage air-conditioning method for storing heat in the housing by blowing cooling air to the housing forming the ceiling of the first air-conditioned room,
A housing heat storage air-conditioning method, characterized in that, during the heat storage operation of the housing, air conditioning is performed so that the internal pressure of the second air-conditioned room having the housing as a floor surface becomes larger than the atmospheric pressure.   The enclosure heat storage air conditioning method according to claim 4, wherein the internal pressure of the second air-conditioned room is made larger than the atmospheric pressure by dehumidifying and supplying outside air to the second air-conditioned room.

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