JP2016050708A - Air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning device capable of reducing power consumption, the air conditioning device capable of adjusting relative humidity.SOLUTION: When a relative humidity of indoor air is beyond a preset upper limit side humidity HRH, an air conditioning device executes dehumidification control that decreases a temperature of air suctioned from a room to decrease an absolute humidity. Consequently, after the dehumidification control is executed, excluding the case that high-humidity air inflows from the outside of the room, the decreased absolute humidity AH is maintained. Therefore, since heating of indoor air is not needed even when the temperature of indoor air is decreased, power consumption of the air conditioning device 1 can be reduced.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioner capable of adjusting the humidity in a room where an electrical device is installed.

  For example, in the invention described in Patent Document 1, after the air blown to room temperature is heated by a heater to reduce the indoor relative humidity, the compressor is controlled so that the indoor relative humidity becomes 40% to 60%. doing.

JP 2001-248880 A

  By the way, in a room where an electrical device is installed, if the relative humidity in the room becomes high, there is a high possibility that a failure will occur in the electrical device. And in the present air conditioner, the temperature of room air is raised using an electric heater etc., and the relative humidity of room air is lowered. For this reason, it is difficult for the current air conditioner to reduce the power consumption of the air conditioner.

  An object of this invention is to provide the air conditioner which can reduce power consumption in view of the said point. In addition, since the invention described in Patent Document 1 is an invention related to a dehumidifier for the purpose of suppressing the growth of mold, it cannot be applied to the present invention.

  In order to achieve the above object, according to the present invention, in an air conditioner capable of adjusting the humidity of a room in which an electric device is installed, a cooling device (3) for cooling air supplied to the room, and a temperature sensor (S1) A signal from the temperature detector (5) that detects the temperature of the indoor air using the signal and a signal from the humidity sensor (S2) are input, and relative signals of the indoor air are input using the signal. A humidity detector (5) for detecting humidity and a controller (5) for controlling the operation of at least the cooling device (3), wherein the relative humidity of the indoor air exceeds a preset upper limit side humidity (HRH) And a controller (5) capable of executing a dehumidification control mode for lowering the absolute humidity by lowering the temperature of air sucked from the room.

  In the present invention, when the relative humidity of the room air exceeds the upper limit side humidity (HRH), the dehumidification control mode for reducing the absolute humidity in the room is executed. Therefore, after the dehumidification control mode is executed, The reduced absolute humidity is maintained except when high humidity air flows from the outside.

  In other words, in the present invention, after the dehumidification control mode is executed, the relative humidity of the indoor air is set to the upper limit humidity even when the temperature of the indoor air is reduced, except when high humidity air flows from the outside. (HRH) is not exceeded.

  On the other hand, in the current air conditioner, only the relative humidity is lowered by heating the room air, and the absolute humidity in the room is not lowered. Therefore, the temperature of the room air is lowered and the relative humidity is raised. It is necessary to heat the room air.

  In the present invention, after the dehumidification control mode is executed, it is not necessary to heat the indoor air even if the temperature of the indoor air decreases, except when high humidity air flows in from the outside. The power consumption of the device can be reduced.

  Incidentally, the reference numerals in parentheses for each of the above means are examples showing the correspondence with the specific means described in the embodiments described later, and the present invention is indicated by the reference numerals in the parentheses of the above respective means. It is not limited to specific means.

It is a mimetic diagram of air-conditioner 1 concerning a 1st embodiment of the present invention. It is a flowchart which shows the dehumidification control which concerns on 1st Embodiment of this invention. It is a flowchart which shows the dehumidification control which concerns on 2nd Embodiment of this invention. It is a schematic diagram of the air conditioner 1 which concerns on 2nd Embodiment of this invention. It is a flowchart which shows the dehumidification control which concerns on 3rd Embodiment of this invention.

  The “embodiment of the invention” described below shows an example of the embodiment. In other words, the invention specific items described in the claims are not limited to the specific means and structures shown in the following embodiments.

  In the present embodiment, the present invention is applied to a vapor compression refrigeration cycle for an air conditioner that cools a server room. In the server room, electrical devices such as an ICT device and an emergency power supply (battery) are installed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that at least one member or part described with at least a reference numeral is provided, except for cases where “plural”, “two or more” and the like are omitted.

(First embodiment)
1. Configuration of Air Conditioner As shown in FIG. 1, the air conditioner 1 according to the present embodiment includes a cooling device 3, a control device 5, and the like. The cooling device 3 cools the air supplied to the room where the electrical equipment is installed. The control device 5 controls the operation of the cooling device 3.

  The cooling device 3 according to the present embodiment is constituted by a vapor compressor type refrigerator. That is, the cooling device (vapor compressor type refrigerator) 3 includes a high-pressure heat exchanger 3A, a decompressor 3B, a low-pressure heat exchanger 3C, a compressor 3D, a gas-liquid separator 3E, and the like.

  The high-pressure heat exchanger 3A cools the high-pressure refrigerant (hereinafter also referred to as discharge refrigerant) discharged from the compressor 3D. That is, the high-pressure heat exchanger 3A exchanges heat between the outdoor air and the discharged refrigerant to cool the discharged refrigerant. In this embodiment, the pressure of the discharged refrigerant is smaller than the critical pressure of the refrigerant. For this reason, the discharged refrigerant in the gas phase is cooled and condensed (liquefied) by the high-pressure heat exchanger 3A.

  The decompressor 3B decompresses and expands the high-pressure refrigerant that has flowed out of the high-pressure heat exchanger 3A. The low pressure heat exchanger 3C evaporates the low pressure liquid phase refrigerant decompressed by the decompressor 3B. That is, in the low-pressure heat exchanger 3C, the low-pressure liquid-phase refrigerant absorbs heat from the air supplied into the room and evaporates (vaporizes), thereby cooling the air.

  The compressor 3D sucks and compresses the refrigerant flowing out from the low pressure heat exchanger 3C side, and discharges the compressed refrigerant to the high pressure heat exchanger 3A side. The gas-liquid separator 3E separates and extracts the gas-phase refrigerant from the refrigerant flowing out from the low-pressure heat exchanger 3C, and supplies the gas-phase refrigerant to the suction side of the compressor 3D.

  The first blower 3F blows cooling air (outdoor air) to the high-pressure heat exchanger 3A. The second blower 3G blows air supplied to the low pressure heat exchanger 3C indoors. And control device 5 controls operation of compressor 3D, decompressor 3B, the 1st blower 3F, the 2nd blower 3G, etc.

2. 2. Control of air conditioner 2.1 Control device The control device 5 is composed of a microcomputer having a CPU, a ROM, a RAM, and the like. A program (software) for executing control of the compressor 3D and the like is stored in advance in a nonvolatile storage unit such as a ROM.

  Detection signals from the room temperature sensor S1, the humidity sensor S2, the low pressure temperature sensor S3, the evaporation temperature sensor S4, and the like are input to the control device 5. The room temperature sensor S1 outputs a signal indicating the temperature of room air. The humidity sensor S2 outputs a signal indicating the relative humidity of the room air.

  The control device 5 includes a temperature detection unit that detects the temperature of the room air using a signal from the room temperature sensor S1, and a humidity detection unit that detects the relative humidity of the room air using a signal from the humidity sensor S2. Is provided.

  In the present embodiment, the temperature detection unit and the humidity detection unit are configured by software. The room temperature sensor S1 and the humidity sensor S2 may be any of a sensor installed in advance in the air-conditioning target space (server room) and a sensor installed for the air conditioner 1. That is, the installation location of room temperature sensor S1 and humidity sensor S2 is not ask | required.

  The low-pressure temperature sensor S3 detects the refrigerant temperature on the refrigerant outlet side of the low-pressure heat exchanger 3C. The evaporation temperature sensor S4 detects the temperature of the low pressure heat exchanger 3C, that is, the refrigerant evaporation temperature in the low pressure heat exchanger 3C.

  The low-pressure temperature sensor S3 and the evaporation temperature sensor S4 are sensors for detecting the refrigerant heating degree on the refrigerant outlet side of the low-pressure heat exchanger 3C, that is, the cooling load (heat load) in the low-pressure heat exchanger 3C. Therefore, instead of the evaporation temperature sensor S4, the evaporation pressure in the low-pressure heat exchanger 3C may be detected.

2.2 Pressure reducer The pressure reducer 3B is composed of a variable throttle device (not shown). The variable throttle device has an electric actuator (not shown) that changes and adjusts the throttle opening. The control device 5 controls the operation of the actuator to change the throttle opening of the decompressor 3B. Specifically, the control device 5 controls the throttle opening of the decompressor 3B so that the refrigerant heating degree on the refrigerant outlet side of the low-pressure heat exchanger 3C is a value equal to or greater than 0 and a predetermined value set in advance. To control.

2.3 Control of Compressor etc. The control device 5 can control the compressor 3D etc. in at least one of the “normal control” and “dehumidification control” control modes.

<Normal control>
The control device 5 controls the rotation speed of the compressor 3D so that a necessary refrigeration capacity (cooling capacity) is generated in the low-pressure heat exchanger 3C. Specifically, the control device 5 controls the operation of the compressor 3D so that the room temperature (detected temperature of the room temperature sensor S1) falls within a preset temperature range (for example, 10 ° C. to 30 ° C.).

  When reducing the room temperature in the normal control, the control device 5 increases the refrigerating capacity generated in the low-pressure heat exchanger 3C by increasing the rotation speed of the compressor 3D. At this time, the control device 5 increases the blowing amount of the second blower 3G until at least the surface temperature of the low-pressure heat exchanger 3C becomes higher than the dew point.

  That is, when the rotation speed of the compressor 3D increases, the evaporation temperature may decrease and the surface temperature of the low-pressure heat exchanger 3C may become the dew point or lower. When the surface temperature falls below the dew point, much of the refrigeration capacity generated in the low pressure heat exchanger 3C is consumed to condense the vapor in the air. For this reason, the power consumption required for lowering the room temperature increases.

  Therefore, when the number of rotations of the compressor 3D is increased, the control device 5 increases the blast volume of the second blower 3G, that is, the heat load of the low-pressure heat exchanger 3C, so that the sensible heat ratio (SHF) is set in advance. It shall be more than the set value (for example, 0.95).

  When the cooling capacity is reduced in the normal control, the control device 5 reduces the refrigerating capacity generated in the low-pressure heat exchanger 3C by reducing the rotation speed of the compressor 3D and responds to the reduced refrigerating capacity. The air flow rate of the second blower 3G is reduced.

<Dehumidification control>
The dehumidification control is a control mode that is executed when the relative humidity RH of the indoor air exceeds a preset upper limit side humidity HRH. That is, the control device 5 performs normal control when the relative humidity RH of the indoor air is equal to or lower than the upper limit side humidity HRH, and executes dehumidification control when the relative humidity RH exceeds the upper limit side humidity HRH.

  When executing the dehumidifying control, the control device 5 reduces the temperature of the air sucked from the room to a dew point or less, condenses moisture in the room air, and lowers the absolute humidity AH. Then, the control device 5 (a) when a preset time has elapsed since the start of dehumidification control, (b) when the absolute humidity in the room is less than a preset value, and (c) When any one of the times when the temperature of the indoor air becomes lower than the preset lower limit temperature LT is satisfied, the dehumidification control is stopped and the normal control is resumed.

<Details of dehumidification control>
When the air conditioner 1 is activated, the control device 5 performs normal control. When the relative humidity RH of the room air exceeds the upper limit side humidity HRH (70% in this embodiment) during execution of normal control, the control device 5 executes the dehumidification control mode.

  FIG. 2 is a flowchart showing details of dehumidification control. Note that a program for executing the control shown in FIG. 2 is stored in advance in a nonvolatile storage unit such as a ROM. The program is read and executed by the control device 5 (CPU) when the dehumidification control is executed.

  When the dehumidifying control is executed, the control device 5 increases the rotational speed of the compressor 3D to the maximum rotational speed and controls the rotational speed of the second blower 3G so that the sensible heat ratio becomes smaller than that during normal control. (S1). As a result, the moisture in the room air is condensed, and the absolute humidity AH is reduced.

  Next, the control device 5 sets a lower limit value (hereinafter referred to as “blow-off”) of a blow-off temperature range in which the temperature of air supplied to the room from the cooling device 3 (low-pressure heat exchanger 3C) (hereinafter referred to as “blow-out temperature”) is preset. It is determined whether it is less than the lower temperature limit (S3). In the present embodiment, the blowing temperature is detected using the detection signal of the evaporation temperature sensor S4.

  The lower limit of the blowing temperature is the dew point of the air before being cooled by the cooling device 3 (low pressure heat exchanger 3C), that is, the indoor air. The control device 5 determines the dew point based on the temperature of the room air and the relative humidity.

  When the control device 5 determines that the blowout temperature is lower than the blowout temperature lower limit value (S3: YES), the control device 5 reduces the rotation speed of the compressor 3D from the current rotation speed, and the rotation speed of the second blower 3G. Is increased from the current rotational speed, etc. (S5).

  Next, the control device 5 (a) that a preset time has elapsed since the start of the dehumidification control, (b) that the absolute humidity in the room has become less than a preset value, and (c ) It is determined whether any one of the conditions that the temperature of the room air is lower than the preset lower limit temperature LT is satisfied (S7).

  When it is determined that any one of the conditions (a) to (c) is satisfied (S7: YES), the control device 5 stops the dehumidification control and executes the normal control (S9). When the control device 5 determines that none of the conditions (a) to (c) is satisfied (S7: NO), and when it determines that the blowing temperature is not less than the blowing temperature lower limit value. (S3: NO), S7 is executed.

3. Features of Air Conditioning Apparatus According to this Embodiment This embodiment is characterized in that a dehumidification control mode for reducing the indoor absolute humidity AH is executed when the relative humidity of the indoor air exceeds the upper limit side humidity HRH. . For this reason, after the dehumidification control mode is executed, the reduced absolute humidity AH is maintained except when high-humidity air flows from the outside.

  That is, in the present embodiment, after the dehumidification control mode is executed, the relative humidity RH of the indoor air is the upper limit even when the temperature of the indoor air is reduced, except when highly humid air flows from the outside. The side humidity HRH is not exceeded.

  On the other hand, in the method of reducing the relative humidity RH by heating the indoor air, the indoor absolute humidity AH is not reduced. Therefore, every time the temperature of the indoor air decreases and the relative humidity RH increases, The air needs to be heated.

  And in this embodiment, after the dehumidification control mode is executed, it is not necessary to heat the room air even if the temperature of the room air decreases except when high humidity air flows from the outside. The power consumption of the air conditioner 1 can be reduced.

(Second Embodiment)
When the control device 5 according to the above-described embodiment determines that the blowing temperature is lower than the blowing temperature lower limit value, the dehumidifying control is stopped after reducing the rotational speed of the compressor 3D to be lower than the current rotational speed. Judgment whether or not to let.

  In contrast, when the control device 5 according to the present embodiment determines that the blowing temperature is lower than the blowing temperature lower limit value, as shown in S4 of FIG. The rotational speed of the compressor 3D is reduced below the current rotational speed.

  That is, in this embodiment, as shown in FIG. 4, the heating apparatus 4 which heats the air supplied indoors is provided. The operation of the heating device 4 is controlled by the control device 5. The heating device 4 according to the present embodiment is an electric heater such as a sheathed heater.

  Then, as shown in FIG. 3, when the control device 5 determines that the blowing temperature is less than the blowing temperature lower limit value (S3: YES), the temperature difference between the blowing temperature and the blowing temperature lower limit value increases. A large heating force is generated by the heating device 4 (S11).

  When operating the heating device 4, the control device 5 determines again whether or not the blowing temperature is lower than the blowing temperature lower limit (S 13). When it is determined that the blowing temperature is lower than the blowing temperature lower limit value (S13: YES), the control device 5 executes S5.

  When it is determined that the blowing temperature is not lower than the blowing temperature lower limit value (S13: NO), the control device 5 executes S7. In FIG. 3, the same reference numerals are assigned to the same control steps as the dehumidification control (FIG. 2) according to the first embodiment.

(Third embodiment)
This embodiment is a modification of the second embodiment. That is, as shown in FIG. 5, in S13, the blowout temperature lower limit value (in FIG. 5, the second blowout temperature lower limit value) is lower than the blowout temperature lower limit value in S3 (denoted as the first blowout temperature lower limit value in FIG. 5). Value and notation) and the blowing temperature.

  Thereby, in this embodiment, it becomes possible to make time to operate compressor 3D by maximum rotation speed longer than 2nd Embodiment. Therefore, in this embodiment, it can dehumidify more than 2nd Embodiment.

In FIG. 5, the same reference numerals are assigned to the same control steps as the dehumidifying control (FIG. 3) according to the second embodiment.
(Other embodiments)
Although the temperature detection part and the humidity detection part which concern on the above-mentioned embodiment were comprised by software, this invention is not limited to this, You may comprise these detection parts by hardware.

  Although the heating device 4 according to the second embodiment is configured by a sheathed heater, the present invention is not limited to this, and for example, heat of the high-pressure heat exchanger 3A, heat of the compressor 3D, and the like. You may heat the air which blows off indoors using.

  The cooling device 3 according to the present invention is not limited to the vapor compression refrigerator shown in FIGS. 1 and 4, for example, an injection-type vapor compression refrigerator or an absorption (adsorption) refrigerator. Etc.

  In the above-described embodiment, the refrigerating capacity generated in the high-pressure heat exchanger 3A is controlled by controlling the rotation speed of the compressor 3D, but the present invention is not limited to this. That is, for example, the refrigerating capacity is controlled by adjusting the throttle opening of the decompressor 3B and the rotational speed of the compressor 3D, and the temperature of the air blown into the room is controlled by controlling the rotational speed of the second blower 3G. May be equal.

  In the above-described embodiment, when the room temperature is controlled to be within a preset temperature range, the rotation speed of the compressor 3D is controlled using the temperature detected by the room temperature sensor S1, but the present invention is not limited to this. It is not limited.

  That is, for example, a sensor that detects the temperature of the air supplied from the cooling device 3 (low-pressure heat exchanger 3C) (the temperature of the blown air) is provided, and the rotation speed of the compressor 3D is controlled using the temperature detected by the sensor. May be. At this time, the rotation speed of the second blower 3G may be controlled based on the difference between the room temperature and the blown air temperature.

  In the above-described embodiment, the present invention is applied to the air conditioning of the server room in which the electrical equipment is installed. However, the present invention is not limited to this, and a machine room or factory in which an electrical machine such as an electric motor is installed. The present invention can also be applied to an air conditioner.

  Further, the present invention is not limited to the above-described embodiment as long as it matches the gist of the invention described in the claims.

DESCRIPTION OF SYMBOLS 1 ... Air conditioner 3 ... Cooling device 3A ... High pressure heat exchanger 3B ... Depressurizer 3C ... Low pressure heat exchanger 3D ... Compressor 3E ... Gas-liquid separator 3F ... First blower 3G ... Second blower 4 ... Heating device 5 ... Control device S1 ... Room temperature sensor S2 ... Humidity sensor S3 ... Low pressure temperature sensor S4 ... Evaporation temperature sensor

Claims (4)

In an air conditioner that can adjust the humidity in the room where the electrical equipment or electrical machine is installed,
A cooling device for cooling the air supplied to the room;
A temperature detection unit that receives a signal from the temperature sensor and detects the temperature of the indoor air using the signal;
A humidity detection unit that receives a signal from the humidity sensor and detects the relative humidity of the room air using the signal;
A controller that controls at least the operation of the cooling device, and lowers the absolute humidity by lowering the temperature of air sucked from the room when the relative humidity of the room air exceeds a preset upper limit side humidity. And a control unit capable of executing a dehumidification control mode.   When the preset time has elapsed since the start of the dehumidification control mode, the control unit is preset when the indoor absolute humidity is less than a preset value, and the temperature of the indoor air is preset. 2. The air conditioner according to claim 1, wherein the dehumidification control mode is stopped when one of the times when the temperature becomes lower than the lower limit side temperature is satisfied. A heating device for heating air supplied into the room, the heating device being controlled by the control unit;
The air conditioner according to claim 1 or 2, wherein the control unit operates the heating device when the temperature of the indoor air becomes lower than a preset lower limit side temperature.   The air conditioner according to any one of claims 1 to 3, wherein the electrical device is an electrical device for information communication technology.

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