JP2013047583A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an air conditioner that can secure a sufficient prevention effect to dew condensation while maintaining proper humidity in an interior space even if a window is hung with a curtain.SOLUTION: The air conditioner includes: an interior temperature correction unit 203 for obtaining a corrected interior temperature by correcting an interior temperature according to an opened or closed state of the curtain; a dew point temperature calculating unit 204 for calculating a dew point temperature of the interior space based on the corrected interior temperature and an interior humidity; an interior side window surface temperature calculating unit 205 for calculating an interior side window surface temperature that is a surface temperature on an interior side of the window based on the corrected interior temperature and an outside air temperature; a dew condensation occurrence determination unit 208 for determining whether there is a possibility of dew condensation on the surface on an interior side of the window based on the interior side window surface temperature and the dew point temperature; and an air condition control unit 211 for controlling the air conditioner to dehumidify the interior space when the dew condensation occurrence determination unit 208 determines that there is a possibility of dew condensation on the window.

Description

  The present invention relates to an air conditioner.

  In an indoor space having a window that separates the room from the outside, when the outside air temperature decreases during the cold season and the temperature of the window's indoor surface (hereinafter referred to as the “window indoor surface”) becomes lower than the dew point temperature in the room, Condensation occurs on the window interior. Conventionally, when the indoor temperature, the window indoor surface temperature, and the outside air temperature are in an equilibrium state, the amount of heat transferred from the room to the window indoor surface is equal to the amount of heat transferred from the room to the outside. By calculating the indoor surface temperature, calculating the dew point temperature corresponding to the window indoor surface temperature, and controlling the indoor humidity so that the measured dew point temperature measured by the dew point temperature sensor does not exceed the calculated dew point temperature. A technique for preventing the occurrence of condensation has been disclosed (for example, Patent Document 1).

JP 2005-042993 A

  However, in the above prior art, when a curtain is hung on a window, heat transfer between the window side space and the indoor space of the curtain is hindered, and the temperature in the vicinity of the window It becomes lower than the room temperature measured by the temperature sensor built in the indoor unit or remote control of the room. In other words, since the window interior surface temperature obtained by the calculation is higher than the actual window interior surface temperature, there is a problem in that it may be controlled to a higher humidity and a sufficient dew condensation prevention effect may not be obtained. It was.

  The present invention has been made in view of the above, and an air conditioner capable of obtaining a sufficient dew condensation preventing effect while appropriately maintaining the humidity of an indoor space even when a curtain is hung on a window. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, an air conditioner according to the present invention is an air conditioner that performs air conditioning of an indoor space including a curtain on the indoor side of a window that separates the room from the outside, An indoor temperature detecting unit for detecting the indoor temperature, an indoor humidity detecting unit for detecting the indoor humidity, an outdoor air temperature detecting unit for detecting the outdoor air temperature, and a corrected indoor temperature in which the indoor temperature is corrected according to the open / closed state of the curtain. A dew point temperature calculating unit that calculates a dew point temperature of the indoor space based on the corrected indoor temperature and the indoor humidity, and on the basis of the corrected indoor temperature and the outside air temperature, There is a possibility that condensation occurs on the indoor side surface of the window based on the window indoor surface temperature calculation unit that calculates the window indoor surface temperature, which is the indoor surface temperature, and the window indoor surface temperature and the dew point temperature. Ah A dew generation determination unit for determining whether or not the dew generation occurs and the dew generation determination unit determines that there is a possibility that dew condensation is generated in the window. An air conditioning control unit.

  According to the present invention, even when a curtain is hung on a window, there is an effect that a sufficient dew condensation preventing effect can be obtained while appropriately maintaining the humidity of the indoor space.

Drawing 1 is a figure showing an example of 1 composition of an air harmony machine concerning an embodiment. Drawing 2 is a figure showing an example of the appearance of the remote control of the air harmony machine concerning an embodiment. Drawing 3 is a figure showing an example of the appearance of the indoor unit of the air harmony machine concerning an embodiment. FIG. 4 is a diagram illustrating an example of the indoor temperature correction coefficient table. FIG. 5 is a diagram illustrating an example of the correction room temperature table. FIG. 6 is a flowchart illustrating an example of the condensation prevention control process.

  An air conditioner according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In addition, this invention is not limited by embodiment shown below.

Embodiment 1 FIG.
In this embodiment, in an air conditioner that air-conditions an indoor space having a curtain on the indoor side of a window that separates the room from the outdoor, condensation on the window indoor surface during the cold season when the room temperature is higher than the outside air temperature An example of performing dew condensation prevention control for preventing the above will be described.

  Drawing 1 is a figure showing an example of 1 composition of an air harmony machine concerning an embodiment. As shown in FIG. 1, the air conditioner according to the embodiment includes a remote controller 1, an indoor unit 2, and an outdoor unit 3.

  The indoor unit 2 includes an indoor temperature detection unit 201 that detects indoor temperature, an indoor humidity detection unit 202 that detects indoor humidity, and an indoor temperature correction unit 203 that calculates a corrected indoor temperature by correcting the indoor temperature according to the open / close state of the curtain. A dew point temperature calculating unit 204 for calculating the dew point temperature of the indoor space based on the corrected indoor temperature and the indoor humidity, a window indoor surface temperature calculating unit 205 for calculating the window indoor surface temperature based on the corrected indoor temperature and the outside air temperature, Based on the heat transfer coefficient storage unit 206 that stores the heat transfer coefficient of the window interior surface, the heat transfer rate storage unit 207 that stores the heat transfer coefficient of the window (window glass), the window interior surface based on the window interior surface temperature and the dew point temperature Based on the detection results of the dew generation determination unit 208, the radiant heat detection unit 209 that detects the radiant heat from the indoor space, and the detection result of the radiant heat detection unit 209 The window position detection unit 210 that detects the position of the window in the inner space, and when there is a possibility that condensation occurs on the inner surface of the window, the dehumidifying operation is performed toward the window position detected by the window position detection unit 210. An air conditioning control unit 211 that performs air conditioning control is provided. The outdoor unit 3 includes an outside air temperature detection unit 301 that detects the outside air temperature.

  Drawing 2 is a figure showing an example of the appearance of the remote control of the air harmony machine concerning an embodiment. As shown in FIG. 2, the remote controller 1 includes a normal operation key 11 for starting and stopping a normal operation in the air conditioner according to the embodiment, and a start of a dew condensation prevention operation in the air conditioner according to the embodiment. A dew condensation prevention operation key 12 for stopping, a display unit 13 such as a liquid crystal display for displaying a curtain open / close state selection screen, and a selection key 14 for the user to select the curtain open / close state are provided. In addition, the remote controller 1 is provided with a display information storage unit (not shown) in which the above-described curtain open / close state selection screen is stored in advance.

  The remote controller 1 is a controller that performs wireless communication using infrared rays or radio waves, and has a function of transmitting a control command to the indoor unit 2 by a user operation. In the present embodiment, when the user operates the dew condensation prevention operation key 12, the selection screen for the curtain open / close state is displayed on the display unit 13, and the user operates the selection key 14 while looking at the display unit 13. By selecting the open / close state, a dew condensation prevention control start command is transmitted to the indoor unit 2. Further, when the user operates the dew condensation prevention operation key 12 again, a dew condensation prevention control stop command is transmitted to the indoor unit 2. Needless to say, the present invention is not limited by the above-described method for selecting the open / close state of the curtain, the transmission timing of the condensation prevention control start command or the condensation prevention control stop command, and the like.

  Drawing 3 is a figure showing an example of the appearance of the indoor unit of the air harmony machine concerning an embodiment. As shown in FIG. 3, the indoor unit 2 includes a left and right louver 21 for changing the wind direction to the left and right, an upper and lower vane 22 for changing the wind direction up and down, and an indoor temperature distribution detecting unit 23 that captures the temperature distribution of the indoor space. It has. The indoor temperature distribution detection unit 23 is provided with the radiant heat detection unit 209 described in FIG. 1 and a motor (not shown), and can capture the temperature distribution over the entire indoor space. The operations of the left and right louvers 21, the upper and lower vanes 22, and the indoor temperature distribution detection unit 23 are controlled by the air conditioning control unit 211.

  Next, dew condensation prevention control in the air conditioner according to the embodiment will be described. In the air conditioner according to the embodiment, the dew prevention control is started when the indoor unit 2 receives the dew prevention control start command from the remote controller 1 during normal operation or standby. In this dew condensation prevention control, it is necessary to accurately determine whether or not there is a possibility that condensation occurs on the window interior surface. For this purpose, it is important that the window interior surface temperature is accurately calculated. Here, first, a method for calculating the window interior surface temperature will be described.

When the window is not equipped with a curtain, the heat transfer amount q1 from the room to the window room surface is such that the room temperature is θi [° C], the window room surface temperature is θgi [° C], and the heat transfer coefficient of the window room surface is αi. If [W / (m ² K)], it can be expressed by the following formula (1).

  q1 = αi (θi−θgi) (1)

Further, the amount of heat transfer q2 from the room to the outside is expressed by the following formula (2), where the outside air temperature is θo [° C.] and the heat transmissivity of the window (window glass) is k [W / (m ² K)]. Can be represented.

  q2 = k (θi−θo) (2)

  When the indoor temperature θi, the window indoor surface temperature θgi, and the outside air temperature θo are in an equilibrium state, the relationship in which the heat transfer amount q1 from the room to the window indoor surface is equal to the heat transfer amount q2 from the room to the outdoor is used. From the above formulas (1) and (2), the following formula (3) is obtained.

  αi (θi−θgi) = k (θi−θo) (3)

  When the above equation (3) is solved for the window indoor surface temperature θgi, the following equation (4) is obtained.

  θgi = θi − {(k / αi) × (θi−θo)} (4)

  On the other hand, when the curtain is provided in the window and the curtain is closed, heat transfer between the window side space and the indoor space of the curtain is hindered, and the temperature in the vicinity of the window 2 becomes lower than the room temperature measured by the room temperature detection unit 201 built in the room 2. That is, when the window interior surface temperature θgi is calculated using the above equation (4), it is higher than the actual window interior surface temperature. For this reason, even if the window interior surface temperature is actually lower than the dew point temperature, it is determined that there is no possibility of dew condensation occurring on the window interior surface, and a sufficient dew condensation prevention effect may not be obtained.

  Therefore, in the present embodiment, the indoor temperature correction unit 203 calculates the corrected indoor temperature (p × θi) by multiplying the indoor temperature θi by the predetermined indoor temperature correction coefficient p according to the open / closed state of the curtain, The indoor surface temperature calculation unit 205 calculates the window indoor surface temperature θgi using the corrected indoor temperature (p × θi). The calculation formula of the window indoor surface temperature θgi in the present embodiment can be expressed by the following formula (5).

  θgi = (p × θi) − [(k / αi) × {(p × θi) −θo)}] (5)

  The value of the indoor temperature correction coefficient p is set to “1.0” when the curtain is in an open state, and when the curtain is in a closed state, for example, “ It may be 0.8 ”. In this way, even when the curtain is closed, the window interior surface temperature θgi with less error can be obtained.

  Note that the values of the heat transfer coefficient k of the window (window glass) and the heat transfer coefficient αi of the window interior are fixed to the typical value of a general window (window glass) and the heat transfer coefficient storage unit 206 and the heat transfer coefficient. The values may be stored in the storage unit 207, or the values optimized according to the thickness and type (single phase, multiple layers, etc.) of the glass when the air conditioner is installed, etc. Or the like may be set in the heat transfer coefficient storage unit 206 and the thermal conductivity storage unit 207, respectively.

  Further, the indoor temperature correction coefficient p in a state where the curtain is closed may be held in the indoor temperature correction unit 203 as a fixed value in accordance with the heat insulation effect of a general curtain, or the heat insulation effect of the curtain. A value optimized according to the above may be set in the room temperature correction unit 203 using the remote controller 1 or a dedicated setting jig.

  As described above, by optimizing the value of the thermal conductivity k of the window (window glass), the value of the heat transfer coefficient αi of the window interior surface, and the value of the room temperature correction coefficient p, a more accurate window interior surface temperature θgi is obtained. be able to.

  In addition, a plurality of room temperature correction coefficients p corresponding to the heat insulation effect of the curtain are held in the room temperature correction unit 203 as a room temperature correction coefficient table so that they can be selected using the remote controller 1 according to the heat insulation effect of the curtain. Good. FIG. 4 is a diagram illustrating an example of the indoor temperature correction coefficient table. In the example shown in FIG. 4, an example is shown in which the indoor temperature correction coefficient p decreases in order from the top in 0.1 increments within the range of 1.0 to 0.1. p = 1.0 is a room temperature correction coefficient applied when the curtain is opened, and p = 0.9 to 0.1 is a room applied when the curtain is closed. It is a temperature correction coefficient. When carrying out the dew condensation prevention control, the smaller the room temperature correction coefficient is applied as the heat insulation effect by the curtain is larger, and the larger the room temperature correction coefficient is applied as the heat insulation effect by the curtain is smaller. In this case, for example, when a dew condensation prevention control start command is transmitted from the remote controller 1 to the indoor unit 2, a number (No. 1 to 10) corresponding to the indoor temperature correction coefficient corresponding to the heat insulating effect of the curtain is also transmitted. The room temperature correction coefficient to be applied may be selected according to the above, or a number (No. 1 to 10) corresponding to the indoor temperature correction coefficient corresponding to the heat insulation effect of the curtain is transmitted from the remote controller 1 to the indoor unit 2 in advance. You may make it determine the indoor temperature correction coefficient applied when implementing dew condensation prevention control.

  Alternatively, the corrected indoor temperature corresponding to the indoor temperature may be held as a corrected indoor temperature table, and the corrected indoor temperature corresponding to the indoor temperature may be read from the corrected indoor temperature table. FIG. 5 is a diagram illustrating an example of the correction room temperature table. In the example shown in FIG. 5, a corrected indoor temperature table in the case where the indoor temperature correction coefficient p = 0.8 is shown. Similarly, a plurality of room temperature correction coefficients p corresponding to the heat insulating effect of the curtain are used. A corrected indoor temperature table may be held.

  Note that the present invention is limited by the setting method, selection method, application method, and the like of the above-described heat transmissivity k of the window (window glass), the value of the heat transfer coefficient αi of the window indoor surface, and the value of the indoor temperature correction coefficient p. It goes without saying that it is not done.

  Next, a method for determining the possibility of condensation on the window interior will be described. In the present embodiment, as described above, the indoor temperature correction unit 203 obtains the corrected indoor temperature corresponding to the open / closed state of the curtain, and the window indoor surface temperature calculation unit 205 uses the corrected indoor temperature to determine the window indoor surface temperature. Is calculated. In parallel with this, the dew point temperature calculation unit 204 calculates the dew point temperature based on the corrected indoor temperature and the indoor humidity, and the dew generation determination unit 208 condenses on the window indoor surface based on the window indoor surface temperature and the dew point temperature. It is determined whether or not there is a possibility of occurrence. Note that a description of the dew point temperature calculation method is omitted here.

  Here, the dew generation determination unit 208 compares the window indoor surface temperature with the dew point temperature, and when the window indoor surface temperature is equal to or lower than the dew point temperature (window indoor surface temperature ≦ dew point temperature), the dew condensation occurs on the window indoor surface. Is determined to occur. If the window interior surface temperature is equal to or lower than the dew point temperature plus a predetermined temperature α (for example, α = 1 [° C.]) (window interior surface temperature ≦ dew point temperature + α), condensation occurs on the window interior surface. It may be determined that there is a possibility of doing so. In this way, even if the window interior surface temperature drops before the effect of preventing condensation is actually obtained after it has been determined that condensation may occur on the window interior surface, condensation may form on the window interior surface. It is possible to reduce the possibility of occurrence.

  Next, air conditioning control accompanying the dew condensation prevention control operation in the air conditioner according to the embodiment will be described. As described above, the air conditioning control unit 211 controls the air conditioning so that the dehumidifying operation is performed toward the window position detected by the window position detection unit 210 when there is a possibility that condensation occurs on the inner surface of the window. . In the present embodiment, the dehumidifying operation associated with the dew condensation prevention control operation is referred to as “dew condensation prevention operation”. The dew condensation prevention operation is not limited to the above-described dehumidification operation, and any operation mode capable of performing humidity control so that dew condensation does not occur on the window interior surface may be used.

  Here, first, a method for detecting the position of the window in the indoor space will be described. The detection of the window position in the indoor space by the window position detection unit 210 is performed before the dew condensation prevention control is performed, that is, for example, during a trial operation when installing the air conditioner, during standby in the cold season, or during normal operation In this case, it may be performed in advance or at the start of the dew condensation prevention control. The detection of the window position is performed by the air-conditioning control unit 211 controlling the radiant heat detection unit 209 and the window position detection unit 210 provided as the indoor temperature distribution detection unit 23 that takes in the temperature distribution of the indoor space.

  The radiant heat detection unit 209 detects the temperature distribution of the indoor space by detecting radiant heat from the indoor space, and the window position detection unit 210 is based on the temperature distribution of the indoor space that is the detection result of the radiant heat detection unit 209. The position of the window in the indoor space is detected. In the cold season when the anti-condensation control is performed, the window and the temperature around the window are generally the lowest. Therefore, the position with the lowest temperature may be detected as the window position. In addition, this radiant heat detection part 209 can be comprised by a thermopile sensor, for example.

  The air conditioning control unit 211 monitors the determination result of the dew condensation generation determination unit 208, and when the dew generation generation determination unit 208 determines that there is a possibility that dew condensation will occur on the window interior surface, the left and right louvers 21 and the upper and lower vanes 22 are controlled, and the dew condensation prevention operation is performed with the wind direction directed toward the detected window position. In this way, it is possible to prevent dew condensation on the window interior without reducing the humidity of the entire indoor space.

  In addition, when the dew generation determination unit 208 determines that there is no possibility of dew condensation occurring on the window interior surface, the air conditioning control unit 211 returns to the control state before starting the dew condensation prevention control. That is, when the control state before starting the dew condensation prevention control is the normal operation state, the normal operation state is returned, and when the control state is the operation standby state, the operation standby state is returned. As described above, in the present embodiment, the condensation prevention operation is turned ON / OFF according to the determination result of the condensation occurrence determination unit 208, so that sufficient condensation prevention effect can be achieved while keeping the humidity of the indoor space appropriately. Can be obtained.

  Next, the dew condensation prevention control process in the air conditioner according to the embodiment will be described with reference to FIGS. 3 and 6. FIG. 6 is a flowchart illustrating an example of the condensation prevention control process. FIG. 6 shows an example in which the room temperature correction coefficient is set to “0.8” (p = 0.8) when the curtain is closed.

  When the dew condensation prevention control start command is received from the remote controller 1 (step ST101), the room temperature correction unit 203 determines the open / close state of the curtain based on the dew condensation prevention operation command (step ST102). When the curtain is open (step ST102; Yes), the room temperature correction unit 203 calculates the corrected room temperature by setting the room temperature correction coefficient to “1.0” (p = 1.0) (step ST103). If the curtain is closed (step ST102; No), the corrected indoor temperature is calculated by setting the indoor temperature correction coefficient to “0.8” (p = 0.8) (step ST104).

  Subsequently, the window indoor surface temperature calculating unit 205 calculates the window indoor surface temperature using the above-described equation (5) (step ST105), and the dew point temperature calculating unit 204 is based on the corrected indoor temperature and the indoor humidity. A dew point temperature is calculated (step ST106).

  Subsequently, the dew generation determination unit 208 compares the window room surface temperature and the dew point temperature (step ST107), and determines whether or not there is a possibility of dew condensation on the window room surface based on the comparison result. (Step ST108).

  When it is determined that condensation may occur on the window interior surface (step ST108; Yes), the air conditioning control unit 211 controls the left and right louvers 21 and the upper and lower vanes 22, and is detected by the window position detection unit 210. The wind direction is adjusted in the direction of the window position, and the dew condensation prevention operation is started (step ST109), and the process returns to step ST105 and step ST106. When it is determined that there is no possibility that condensation will occur on the window interior (step ST108; No), the air conditioning control unit 211 stops the condensation prevention operation when the condensation prevention operation has already been performed. (Step ST110), the process returns to Step ST105 and Step ST106. Thereafter, the processes of step ST105 to step ST110 are repeatedly performed until a dew condensation prevention control stop command is received from the remote controller 1.

  As described above, according to the air conditioner of the embodiment, the corrected indoor temperature is calculated by multiplying the indoor temperature by the predetermined indoor temperature correction coefficient according to the open / closed state of the curtain, and the corrected indoor temperature is used. Since the window interior surface temperature is calculated, the window interior surface temperature with less error can be obtained even when the curtain is closed.

  In addition, the heat transmissivity of the window (window glass) and the heat transfer coefficient of the window interior used to calculate the window interior surface temperature are optimal depending on the glass thickness and type (single phase, multiple layers, etc.) More accurate window indoor surface temperature can be obtained by optimizing and setting the value of the indoor temperature correction coefficient in a state where the curtain is closed according to the heat insulation effect of the curtain.

  Also, a plurality of room temperature correction coefficients corresponding to the heat insulation effect of the curtain are stored in the room temperature correction unit as a room temperature correction coefficient table, and the room temperature correction coefficient is selected from the room temperature correction coefficient table according to the heat insulation effect of the curtain By doing so, it becomes easy to set the indoor temperature correction coefficient in accordance with the heat insulating effect of the curtain.

  Further, the corrected indoor temperature corresponding to the indoor temperature is held as a corrected indoor temperature table, and the corrected indoor temperature corresponding to the indoor temperature is read from the corrected indoor temperature table, so that the room temperature and the indoor temperature correction coefficient are Multiplication is not necessary. Furthermore, the correction | amendment room temperature according to the heat insulation effect of a curtain becomes possible by hold | maintaining the some correction | amendment room temperature table corresponding to the room temperature correction coefficient according to the heat insulation effect of a curtain.

  Further, the window room surface temperature is compared with the dew point temperature. When the window room surface temperature is equal to or lower than the dew point temperature (window room surface temperature ≦ dew point temperature), or the window room surface temperature is equal to the dew point temperature by a predetermined temperature α ( For example, when α = 1 [° C.] or less (window indoor surface temperature ≦ dew point temperature + α), it is determined that condensation may occur on the window indoor surface, and the determination result is Since the condensation prevention operation is turned ON / OFF, a sufficient condensation prevention effect can be obtained while keeping the humidity of the indoor space appropriate.

  In addition, when the window interior surface temperature is equal to or lower than the dew point temperature plus a predetermined temperature α (for example, α = 1 [° C.]) (window interior surface temperature ≦ dew point temperature + α), condensation occurs on the window interior surface. If it is determined that there is a possibility that condensation will occur, the temperature inside the window interior will drop before the effect of preventing condensation is actually obtained after it has been determined that condensation may occur on the window interior. Even in this case, it is possible to reduce the possibility of condensation on the window interior surface.

  In addition, if the position of the window in the indoor space is detected and it is determined that condensation may occur on the inside surface of the window, the left and right louvers and the upper and lower vanes are controlled so that the wind direction is in the direction of the detected window position. By performing the anti-condensation operation with the screen facing, it is possible to prevent dew condensation on the window indoor surface without reducing the humidity of the entire indoor space.

  In the above-described embodiment, when the window indoor surface temperature is equal to or lower than the dew point temperature (window indoor surface temperature ≦ dew point temperature), or the window indoor surface temperature is equal to the dew point temperature by a predetermined temperature α (for example, α = 1 [ [° C])) or less (window indoor surface temperature ≤ dew point temperature + α), it was determined that condensation may occur on the window indoor surface. It is also possible to change the dew condensation generation criterion depending on whether or not the prevention operation is being performed. For example, when the dew condensation occurrence determination standard is in a state in which the dew condensation prevention operation is not performed, as described above, the window interior surface temperature is equal to or lower than the dew point temperature or a temperature obtained by adding the predetermined temperature α to the dew point temperature. In the case where the dew condensation prevention operation is being performed, the window interior surface temperature is equal to or lower than the dew point temperature plus a predetermined temperature β (α <β) greater than the predetermined temperature α. (Window indoor surface temperature ≦ dew point temperature + β). If it does in this way, frequent ON / OFF switching operation | movement of a dew condensation prevention driving | operation can be prevented.

  The configurations described in the above embodiments are examples of the configurations of the present invention, and can be combined with other known techniques, and a part of the configurations is omitted without departing from the gist of the present invention. Needless to say, it is possible to change the configuration.

DESCRIPTION OF SYMBOLS 1 Remote control 11 Normal operation key 12 Condensation prevention operation key 13 Display part 14 Selection key 2 Indoor unit 21 Left and right louver 22 Vertical vane 23 Indoor temperature distribution detection part 201 Indoor temperature detection part 202 Indoor humidity detection part 203 Indoor temperature correction part 204 Dew point temperature Calculation unit 205 Window indoor surface temperature calculation unit 206 Heat transfer coefficient storage unit 207 Thermal conductivity rate storage unit 208 Condensation occurrence determination unit 209 Radiant heat detection unit 210 Window position detection unit 211 Air conditioning control unit 3 Outdoor unit 301 Outdoor temperature detection unit

Claims (8)

An air conditioner that air-conditions an indoor space having a curtain on the indoor side of a window that separates the room from the outside,
An indoor temperature detector for detecting the indoor temperature;
An indoor humidity detector for detecting indoor humidity;
An outside temperature detector for detecting the outside temperature;
An indoor temperature correction unit for obtaining a corrected indoor temperature by correcting the indoor temperature according to the open / closed state of the curtain;
A dew point temperature calculating unit that calculates a dew point temperature of the indoor space based on the corrected indoor temperature and the indoor humidity;
A window indoor surface temperature calculating unit that calculates a window indoor surface temperature, which is a surface temperature on the indoor side of the window, based on the corrected indoor temperature and the outside air temperature;
Based on the window indoor surface temperature and the dew point temperature, a dew generation determination unit that determines whether or not there is a possibility of dew condensation occurring on the indoor side surface of the window;
An air-conditioning control unit that controls the air-conditioning so as to perform the condensation-preventing operation of the indoor space when it is determined in the dew-condensation generation determination unit that condensation may occur in the window;
An air conditioner comprising: A radiant heat detector for detecting radiant heat from the indoor space;
A window position detector that detects the position of the window in the indoor space based on the detection result of the radiant heat detector;
With
The air conditioner according to claim 1, wherein the air conditioning control unit performs air conditioning control so as to perform the dew condensation prevention operation toward the position of the window detected by the window position detection unit.   The air conditioner according to claim 1 or 2, wherein the room temperature correction unit obtains the corrected room temperature by multiplying the room temperature by a predetermined room temperature correction coefficient.   The indoor temperature correction unit holds a plurality of the indoor temperature correction coefficients as an indoor temperature correction coefficient table, and calculates the corrected indoor temperature by applying the temperature correction coefficient according to the heat insulation effect of the curtain. The air conditioner according to claim 3.   The room temperature correction unit holds the correction room temperature corresponding to the room temperature as a correction room temperature table, and obtains the correction room temperature based on the correction room temperature table. Air conditioner as described in.   The indoor temperature correction unit holds a plurality of the corrected indoor temperature tables corresponding to the heat insulating effect of the curtain, and obtains the corrected indoor temperature using the corrected indoor temperature table corresponding to the heat insulating effect of the curtain. The air conditioner according to claim 5, wherein the air conditioner is characterized.   The said dew condensation generation | occurrence | production determination part determines with the possibility that dew condensation will generate | occur | produce in the said window, when the said window interior surface temperature is below the said dew point temperature, The any one of Claims 1-6 characterized by the above-mentioned. The air conditioner described in the paragraph.   The dew condensation occurrence determination unit determines that dew condensation may occur in the window when the window indoor surface temperature is equal to or lower than a temperature obtained by adding a predetermined temperature to the dew point temperature. The air conditioner as described in any one of 1-6.

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