JP2013204937A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner that provides the amenity by performing dehumidification in a reheat dehumidifying operation while maintaining a set temperature, and is reducible in total power consumption.SOLUTION: An air conditioner includes a refrigeration cycle including a compressor 10, and an indoor heat exchanger comprising a first indoor heat exchanger 12 and a second indoor heat exchanger 13 connected through an indoor electronic expansion valve 24 having a decompressing function and an outdoor heat exchanger 11, and can perform a reheat dehumidifying operation in which the first indoor heat exchanger 12 operates as a heater and the second indoor heat exchanger 13 operates as a cooler. A control section 20 performs control to stop the compressor 10 from operating for a certain time on condition a room temperature is within a predetermined range of a preset temperature in the reheat dehumidifying operation a prescribed time after the start of the operation.

Description

  The present invention relates to an air conditioner that performs dehumidification by a reheat dehumidification operation.

  The air conditioner has a dehumidifying operation in addition to the cooling operation, and there are two types of dehumidifying operations: a cooling dehumidifying operation and a reheat dehumidifying operation.

  In the cooling and dehumidifying operation, the dehumidifying operation is performed by performing the cooling operation, and when the difference between the set temperature and the room temperature becomes small, the compressor is operated with the output of the compressor lowered. It may feel cold and comfort may be reduced.

  On the other hand, the reheat dehumidification operation is equipped with two heaters and coolers as indoor heat exchangers, dehumidifying by cooling with a cooler, and heating with a heater without lowering the room temperature. It is possible to perform dehumidification, and it is possible to obtain comfort while maintaining the room temperature at the set temperature. As an air conditioner which performs such a reheat dehumidification operation, it is disclosed by patent document 1, etc., for example.

Japanese Patent Laid-Open No. 7-139848

  However, the reheat dehumidification operation performed in such an air conditioner has a smaller capacity of the dehumidifier than the cooling dehumidification operation, and therefore increases the amount of refrigerant circulating when trying to obtain the same dehumidification effect. In addition, there is a problem that the output of the compressor has to be increased and the power consumption increases.

  FIG. 7 is a diagram showing the relationship between the power consumption and the elapsed time during the conventional cooling and dehumidifying operation, and FIG. 8 is a diagram showing the change in room temperature during the cooling and dehumidifying operation of FIG. These are the diagrams which show the relationship between the power consumption in the conventional reheat dehumidification driving | operation, and elapsed time, and FIG. 10 is a diagram which shows the change of the room temperature in the reheat dehumidification driving | operation of FIG.

  As shown in FIG. 7, the power consumption while the compressor is operating (ON state) during the cooling and dehumidifying operation is about 300 W in an air conditioner equivalent to a cooling capacity of 2.8 KW, for example. For example, when the set temperature during cooling and dehumidifying operation is set to 28 ° C., as shown in FIG. 8, the room temperature tends to be lower than the set temperature, and the compressor is stopped by thermo-off at around 26 ° C. Keep the room temperature from falling. The power consumption when the compressor is stopped is much smaller than when the compressor is operating. When the room temperature rises again and the temperature sensor detects 30 ° C., the compressor is restarted and the cooling and dehumidifying operation is performed. As described above, during the cooling and dehumidifying operation, the intermittent operation is performed by alternately switching the thermo-on and the thermo-off so that the room temperature is within the allowable range of the set temperature. As a result, the power consumption is suppressed as shown in FIG. It will be. However, in the cooling and dehumidifying operation, since the thermo-off is not performed until the room temperature falls below the allowable range of the set temperature, there is a problem that the user feels cold during that period and thus it is difficult to obtain comfort.

  On the other hand, in the case of the reheat dehumidifying operation, as shown in FIG. 10, it is possible to perform dehumidification while keeping the room temperature constant around the set temperature, so that comfort can be obtained while dehumidifying. it can. However, in the reheat dehumidification operation, since the room temperature is kept constant, thermo-off is difficult to occur, and intermittent operation such as cooling dehumidification is difficult to be performed. Therefore, as shown in FIG. 9, the compressor continuously operates. The state continues. In particular, as shown in FIG. 9, the power consumption during the reheat dehumidifying operation is about 400 W, which is higher than 300 W during the cooling dehumidifying operation (see FIG. 7), and the power consumption continues during the continuous operation. In comparison with the cooling and dehumidifying operation in which the intermittent operation is performed, there is a problem that the total power consumption is increased.

  The present invention has been made in view of the above, and during reheat dehumidification operation, an air conditioner capable of dehumidifying while maintaining a set temperature to obtain comfort and reducing the total power consumption. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, an air conditioner of the present invention includes a refrigeration cycle including a compressor, an indoor heat exchanger, and an outdoor heat exchanger, and the indoor heat exchanger has a pressure reducing function. A first indoor heat exchanger and a second indoor heat exchanger connected via an expansion valve having the function of the first indoor heat exchanger as a heater and cooling the second indoor heat exchanger An air conditioner capable of reheating and dehumidifying operation to act as a vessel, comprising an indoor temperature sensor for detecting a room temperature, a time measuring unit for measuring time, and a control unit for controlling the refrigeration cycle and each unit, If the room temperature detected by the temperature sensor is within a predetermined range of a preset temperature after a lapse of a predetermined time from the start of the reheat dehumidifying operation, the control unit operates the compressor. Stop for a certain period of time The features.

  The air conditioner of the present invention further includes a storage unit that stores a plurality of stop times having different lengths of the compressor according to a difference between the room temperature and the set temperature, and the control unit includes: When stopping the operation of the compressor, the stop time stored in the storage unit is selected according to the temperature difference between the room temperature detected by the room temperature sensor and the set temperature, and the compressor is It is characterized by controlling.

  In the air conditioner of the present invention, the controller further includes an outside air temperature sensor that detects an outside air temperature, and a storage unit that stores a plurality of stop times having different lengths of the compressor according to the outside air temperature, Classifies the temperature difference between the room temperature detected by the room temperature sensor and the outside temperature detected by the outside temperature sensor into the same number as the number of stop times stored in the storage unit, and the temperature difference is small The compressor is controlled so as to be stopped by selecting from the longest stop time to the shortest corresponding to the order from the largest to the smallest.

  The air conditioner of the present invention further includes an indoor humidity sensor that detects indoor humidity, and a storage unit that stores a plurality of operating times having different lengths of the compressor according to the indoor humidity, and the control unit When the reheat dehumidifying operation is started, the compressor is controlled by selecting an operation time stored in the storage unit according to the indoor humidity detected by the indoor humidity sensor.

  Moreover, the air conditioner of the present invention includes an indoor blower, and the control unit controls the operation of the indoor blower to be continued while the operation of the compressor is stopped.

  According to the present invention, the intermittent operation control is repeatedly performed by stopping the compressor for a predetermined time during the reheat dehumidification operation, so that the dehumidification is performed while maintaining the room temperature near the set temperature. And an air conditioner capable of reducing the total power consumption can be obtained.

FIG. 1 is a configuration diagram of a refrigeration cycle of an air conditioner according to the present embodiment. FIG. 2 is a block diagram illustrating the configuration of the air conditioner according to the present embodiment. FIG. 3 is a diagram illustrating an example of an index of the temperature of experience. FIG. 4 is a flowchart illustrating an example of a control operation in the cool wind operation mode of the air conditioner according to the present embodiment. FIG. 5 is a diagram showing the relationship between the power consumption and the elapsed time during the reheat dehumidifying operation in the cool breeze operation mode of FIG. FIG. 6 is a diagram showing changes in room temperature during the reheat dehumidification operation of FIG. FIG. 7 is a diagram showing the relationship between power consumption and elapsed time during a conventional cooling and dehumidifying operation. FIG. 8 is a diagram showing changes in room temperature during the cooling and dehumidifying operation of FIG. FIG. 9 is a diagram showing the relationship between power consumption and elapsed time during a conventional reheat dehumidification operation. FIG. 10 is a diagram showing a change in room temperature during the reheat dehumidifying operation of FIG.

  Embodiments of an air conditioner according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to the following description. In addition, constituent elements according to the following description include elements that can be easily replaced by those skilled in the art, or substantially the same elements, so-called equivalent ranges. In addition, a plurality of modifications described in this embodiment can be arbitrarily combined within a range obvious to those skilled in the art.

  First, the structure of the air conditioner which can perform the reheat dehumidification operation concerning a present Example is demonstrated. FIG. 1 is a configuration diagram of a refrigeration cycle of an air conditioner according to the present embodiment, FIG. 2 is a block diagram showing a configuration of the air conditioner according to the present embodiment, and FIG. It is a figure which shows an example.

  As shown in FIG. 1, the air conditioner 40 according to the present embodiment, when performing the reheat dehumidifying operation, the compressor 10, the four-way valve 22, the outdoor heat exchanger 11, The compressor 10 passes through the outdoor electronic expansion valve (decompressor) 23, the first indoor heat exchanger 12, the indoor electronic expansion valve (decompressor) 24, and the second indoor heat exchanger 13 and again via the four-way valve 22. It is comprised by the refrigeration cycle of the heat pipe type connected so that it might return. The 1st indoor heat exchanger 12 and the 2nd indoor heat exchanger 13 which constitute the indoor side heat exchanger 30 are arranged in parallel to the main pipe branched in the middle, respectively, and the first indoor heat exchanger 12 A first electromagnetic valve 25 is disposed on the downstream side, and a second electromagnetic valve 26 is disposed on the upstream side of the second indoor heat exchanger 13. The main pipe between the first indoor heat exchanger 12 and the first electromagnetic valve 25 and the main pipe between the second indoor heat exchanger 13 and the second electromagnetic valve 26 are connected to the indoor electronic expansion valve 24. Connected through.

  As shown in FIGS. 1 and 2, the control unit 20 that controls the entire air conditioner 40 includes an indoor temperature sensor 15, an outdoor air temperature sensor 21, an indoor humidity sensor 16, a timer unit 19, a compressor 10, and an indoor blower 14. A memory 18 serving as a storage unit, various valve opening / closing units 27 for performing opening / closing driving and switching driving of various valves (22 to 26), a receiving unit 28 for receiving an operation signal transmitted from the remote controller 17, and the like are connected. ing. The control unit 20 is configured by a CPU (Central Processing Unit) or MPU (Microprocessor).

  In the air conditioner 40 configured in this way, during normal cooling operation, the control unit 20 opens the first electromagnetic valve 25 and the second electromagnetic valve 26 via the various valve opening / closing units 27, and the indoor electronic expansion valve By controlling so that 24 may be closed, both the 1st indoor heat exchanger 12 and the 2nd indoor heat exchanger 13 can be used as an evaporator. Further, during the reheat dehumidifying operation, the control unit 20 controls the first electromagnetic valve 25 and the second electromagnetic valve 26 to be closed and the indoor electronic expansion valve 24 to be opened via various valve opening / closing units 27, The first indoor heat exchanger 12 is used as a condenser, and the second indoor heat exchanger 13 is used as an evaporator. When the indoor blower 14 is rotated during the reheat dehumidifying operation, as shown in FIG. 1, the indoor intake air X (white arrow) is cooled and dehumidified by the second indoor heat exchanger 13, and then the first indoor heat exchanger. After being heated at 12, it is returned to the room as indoor blown air Y (outlined arrow), so that dehumidification can be performed without lowering the room temperature.

  A characteristic configuration of the air conditioner of the present embodiment is that control is performed so as to perform an intermittent operation in which the operation is resumed after the compressor is stopped for a predetermined time during the reheat dehumidification operation. As shown in FIG. 10, when the reheat dehumidifying operation is performed, dehumidification can be performed while keeping the room temperature at the set temperature, so that comfort can be obtained. On the other hand, the reheat dehumidification operation solves the problem that the thermo-off hardly occurs because the room temperature is kept constant, and the power consumption is significantly increased when the continuous operation as shown in FIG. 9 is performed.

  Thus, in the air conditioner of the present embodiment, during the reheat dehumidifying operation, the control unit 20 stops the compressor 10 for a predetermined time and performs intermittent operation control for operating for a predetermined time, thereby reducing power consumption. We are trying to reduce it. On the other hand, an air conditioner is generally intended to create an indoor environment in which a person can spend comfortably by appropriately adjusting temperature, humidity, air volume, wind direction, and the like. For this reason, in the air conditioner of a present Example, it is desirable to control so that power consumption may be reduced, maintaining comfort.

  Therefore, as shown in FIG. 3, the perceived temperature of the person is not only the temperature and humidity, but also the wind speed blown from the air conditioner, the radiation temperature emitted from the indoor object, the metabolic rate representing the human activity state, Various indexes are used based on clothing or the like indicating the amount of clothing worn by a person. For example, effective temperature ET (° C.), standard new effective temperature SET * (° C.), and predicted thermal sensation declaration PMV are available as indexes that take wind speed and humidity into account. There are temperature (° C.), misnal temperature (° C.), discomfort index, etc. The effective temperature ET (° C.) includes air temperature, wind speed, and humidity as elements. The standard new effective temperature SET * (° C) is a standard index of the sense of temperature and cooling of the American Society of Heating, Cooling and Air Conditioning (ASHREA), and includes temperature, wind speed, humidity, radiation temperature, metabolic rate, and clothing. . The predicted thermal sensation report PMV is an index of thermal sensation defined in ISO 7730, and includes air temperature, wind speed, humidity, radiation temperature, metabolic rate, and clothing. Linke sensation temperature (° C.) expresses changes in sensation temperature due to air temperature and wind speed, and uses air temperature and wind speed as elements. The Misnar sensation temperature (° C.) represents the change in sensation temperature due to air temperature and humidity, and uses air temperature and humidity as elements. The discomfort index is a numerical value of the summer heat and is determined by a combination of temperature and humidity.

  Among the above indicators, elements that can be adjusted on the air conditioner side are temperature, wind speed, and humidity. Other elements are fixed under general conditions, and focus on the relationship between temperature, humidity, and air temperature, wind speed, and humidity. It is necessary to check beforehand whether it feels uncomfortable.

  While the reheat dehumidifying operation is maintained at a constant temperature and humidity, when the compressor 10 is stopped, the temperature and humidity generally increase with time, and after a certain time has elapsed. It becomes a condition that people feel uncomfortable. Therefore, the air conditioner of the present embodiment restarts the operation of the compressor 10 and performs the reheat dehumidifying operation before it becomes uncomfortable after the compressor 10 is stopped. When returning, the intermittent operation of stopping the compressor 10 is repeated. Such a control operation can be controlled such that the temperature and humidity are always detected using a temperature sensor and a humidity sensor, and the operation is started and stopped when a predetermined temperature and humidity are detected. However, in the air conditioner of the present embodiment, in order to further simplify the control, the compressor 10 is configured so as to correspond to the indoor temperature, the indoor humidity, and the outside air temperature detected with respect to the set temperature or the set humidity. A plurality of stop times and operation times are stored in the memory 18 shown in FIG. 1, and are selected appropriately.

  In order to perform such control, the air conditioner 40 of the present embodiment, as shown in FIG. 1, has an indoor temperature sensor 15 near the intake port of the indoor intake air X (white arrow) of the indoor heat exchanger 30. And an indoor humidity sensor 16 are provided so that the indoor temperature and the indoor humidity can be detected. In addition, an outside temperature sensor 21 is arranged on the windward side of the outdoor heat exchanger 11 so that the outside temperature can be detected. All of the detection data is sent to the control unit 20. The control unit 20 collates the detected temperature data and humidity data with the environmental conditions stored in the memory 18, selects an operation pattern corresponding to the corresponding environmental conditions, and intermittently operates the compressor 10. To control. At that time, the control unit 20 manages and controls the stop time and operation time of the compressor 10 by using the time measuring unit 19.

  In the air conditioner 40 according to the present embodiment, the control unit 20 selects a stop time or an operation time from a plurality of reheat dehumidification operation stop times and operation times stored in advance in the memory 18 according to environmental conditions. Like to do. The memory 18 shown in FIG. 1 and FIG. 2 has a plurality of different lengths for stopping the compressor so as to correspond to the environmental conditions such as the room temperature, the set temperature, and the outside temperature during the reheat dehumidifying operation. Based on environmental conditions such as the room temperature, the set temperature, and the room humidity, a plurality of operating times with different lengths for operating the compressor are stored in the memory 18 in advance. And although the control part 20 of a present Example reads the stop time of the compressor corresponding to the said environmental condition, or operation time from the memory 18, it is not limited to this, Operation time and stop time are set. A plurality of operation patterns may be stored as a pair, and the operation pattern may be selected based on the environmental conditions of the room temperature, the set temperature, and the room humidity.

  2 is a drive circuit that performs opening / closing driving and switching driving of various valves (22 to 26) in accordance with commands from the control unit 20.

  Further, the receiving unit 28 shown in FIG. 2 receives and receives an operation signal operated by the user with the remote controller 17 or a setting signal set using the remote controller 17 by wireless or infrared communication. An operation signal is output to the control unit 20. The setting signal includes setting information such as a setting temperature and a setting humidity set by the user which is necessary in the present embodiment.

  Operation | movement of the air conditioner concerning the present Example comprised in this way is demonstrated in a cool wind operation mode. This cool wind operation mode is operated while using different reheat dehumidifying operation, cooling operation, and air blowing operation according to environmental conditions (indoor temperature, set temperature, indoor humidity, indoor set humidity, outside air temperature, etc.) while suppressing power consumption. Thus, the operation mode is controlled so as to dehumidify while maintaining the set temperature. The characteristic control operation of the present embodiment is that, during the reheat dehumidifying operation, the operation time and the operation stop time of the compressor 10 are selected according to the environmental conditions, and the intermittent operation is performed.

  FIG. 4 is a flowchart for explaining an example of the control operation in the cool air operation mode of the air conditioner according to the present embodiment. In particular, the characteristic control operation of the present embodiment is the compressor 10 during the reheat dehumidification operation. The operation time and the operation stop time are selected according to environmental conditions, and intermittent operation is performed. 5 is a diagram showing the relationship between the power consumption and the elapsed time during the reheat dehumidifying operation in the cool wind operation mode of FIG. 4, and FIG. 6 shows the change in the room temperature during the reheat dehumidifying operation of FIG. FIG.

  Specifically, as shown in FIG. 4, when the operation control in the cool air operation mode is started, the control unit 20 has a temperature difference (ΔT) obtained by subtracting the set temperature set by the user from the current room temperature is −2 ° C. To + 2 ° C. is determined (step S100).

  When it is determined that ΔT is less than −2 ° C. or exceeds + 2 ° C. (No in step S100), the control unit 20 further determines whether ΔT exceeds + 2 ° C. (step S121), and ΔT is + 2 ° C. When it exceeds (Yes in Step S121), the cooling operation is continued until ΔT enters the range of −2 ° C. to + 2 ° C. (Step S123 → S100 → S121).

  As shown in FIGS. 1 and 2, the refrigeration cycle during the cooling operation is such that the control unit 20 drives and controls the various valve opening / closing units 27, thereby opening the first electromagnetic valve 25 and the second electromagnetic valve 26, The pressure is adjusted by the electronic expansion valve 23, the indoor electronic expansion valve 24 is closed, and the compressor 10 is operated. As a result, the refrigerant is compressed from the compressor 10, the four-way valve 22, the outdoor heat exchanger 11, the outdoor electronic expansion valve 23, and the second. It branches to the 1 indoor heat exchanger 12 and the 2nd indoor heat exchanger 13, and is comprised so that it may return to the compressor 10 from the four-way valve 22 after joining. Thus, since the air conditioner 40 can use both the 1st indoor heat exchanger 12 and the 2nd indoor heat exchanger 13 as an evaporator at the time of air_conditionaing | cooling operation, when the indoor air blower 14 is rotated, indoor intake air X (White arrow) becomes low-humidity low-temperature air, and the indoor blowing air Y (white arrow) is returned to the room.

  In step S121, if ΔT does not exceed + 2 ° C., that is, if it is determined that ΔT is less than −2 ° C. (No in step S121), the room temperature is lower than the set temperature, so the compressor operation is stopped. The blower 14 is rotated to enter the blowing operation, and is continued until ΔT enters the range of −2 ° C. to + 2 ° C. (Steps S122 → S100 → S121).

  If ΔT is within the range of −2 ° C. to + 2 ° C. in Step S100 (Yes in Step S100), the control unit 20 starts the reheat dehumidifying operation (Step S101).

  In the refrigerating cycle during the reheat dehumidifying operation, as shown in FIGS. 1 and 2, the control unit 20 controls the various valve opening / closing units 27 to close the first electromagnetic valve 25 and the second electromagnetic valve 26. Then, the outdoor electronic expansion valve 23 is opened, the decompression is adjusted by the indoor electronic expansion valve 24, and the compressor 10 is operated, so that the refrigerant becomes the compressor 10 → the four-way valve 22 → the outdoor heat exchanger 11 → the outdoor electronic expansion valve 23. → The first indoor heat exchanger 12 → the indoor electronic expansion valve 24 → the second indoor heat exchanger 13, and the four-way valve 22 returns to the compressor 10 again. At this time, the control unit 20 rotates the indoor blower 14 so that the indoor intake air X (white arrow) is dehumidified and cooled by the second indoor heat exchanger 13 and then regenerated by the first indoor heat exchanger 12. It is heated to become low-humidity high-temperature air, and the indoor blowing air Y (open arrow) is returned to the room.

  The control unit 20 starts the reheat dehumidifying operation and causes the time measuring unit 19 to count the elapsed time, and continues the reheat dehumidifying operation until a predetermined time (for example, 30 minutes with the initial value stored in the storage unit). (No in step S102). If the predetermined time has elapsed (Yes in step S102), it is determined whether ΔT is in the range of −2 ° C. to + 2 ° C. (step S103).

  In step S103, when the control unit 20 determines that ΔT is less than −2 ° C. or exceeds + 2 ° C. (No in step S103), the control unit 20 further determines whether ΔT exceeds + 2 ° C. (step S121), and ΔT. If the temperature exceeds + 2 ° C. (Yes in step S121), the cooling operation is continued until ΔT enters the range of −2 ° C. to + 2 ° C. (step S123 → S100 → S121), and ΔT exceeds + 2 ° C. If not (No in step S121), since the room temperature is lower than the set temperature, the blowing operation is continued until ΔT enters the range of −2 ° C. to + 2 ° C. (steps S122 → S100 → S121).

  In step S103, if ΔT is within the range of −2 ° C. to + 2 ° C. (Yes in step S103), the control unit 20 further determines whether ΔT is 0 ° C. or less (step S104), and ΔT. When the temperature is 0 ° C. or lower (Yes in step S104), the compressor operation stop time is set to A (for example, 10 minutes) (step S105), and the compressor operation is stopped (step S107).

  In step 104, when ΔT exceeds 0 ° C. (No in step S104), the compressor operation stop time is set to B (for example, 5 minutes) (step S106), and the compressor operation is stopped (step S106). Step S107).

  The control unit 20 stops the operation of the compressor and causes the time measuring unit 19 to count the elapsed time, and stops the compressor until a set stop time (for example, 10 minutes for A) elapses ( When the set stop time has elapsed (No in step S108) (Yes in step S108), it is determined whether ΔT is in the range of −2 ° C. to + 2 ° C. (step S109).

  In step S109, when the control unit 20 determines that ΔT is less than −2 ° C. or exceeds + 2 ° C. (No in step S109), the control unit 20 further determines whether ΔT exceeds + 2 ° C. (step S121). If the temperature exceeds + 2 ° C. (Yes in step S121), the cooling operation is continued until ΔT enters the range of −2 ° C. to + 2 ° C. (step S123 → S100 → S121), and ΔT exceeds + 2 ° C. If not (No in step S121), since the room temperature is lower than the set temperature, the blowing operation is continued until ΔT enters the range of −2 ° C. to + 2 ° C. (steps S122 → S100 → S121).

  In step S109, if ΔT is in the range of −2 ° C. to + 2 ° C. (Yes in step S109), the control unit 20 determines whether the indoor humidity is less than 60% (step S110). When the humidity is less than 60% (Yes in step S110), the predetermined time of the reheat dehumidifying operation is set to α (for example, 10 minutes), the process returns to S101, the reheat dehumidifying operation is started, and the above operation is repeated. It is. When the humidity is 60% or more (No in step S110), the predetermined time of the reheat dehumidifying operation is set to β (for example, 20 minutes), the process returns to S101, the reheat dehumidifying operation is started, and the above operation is repeated. It is.

  As described above, the control unit 20 of the air conditioner according to the present embodiment is configured so that the difference (ΔT) between the room temperature after the elapse of a predetermined time after the reheat dehumidification operation and the set temperature set by the user is within a predetermined range. When entering, the compressor 10 is stopped. At this time, the stop time of the compressor 10 changes according to the temperature difference ΔT. That is, when the temperature of the temperature difference ΔT is high (No in step S104), the time during which the compressor 10 is stopped and the time within which the temperature can be maintained within the predetermined temperature range is likely to be shortened. (Step S106). Further, when the temperature difference ΔT is low (Yes in step S104), since the time during which the compressor 10 is stopped can be maintained within a predetermined temperature range, the compressor 10 is stopped longer. (Step S105).

  The reheat dehumidification operation is started if the difference (ΔT) between the room temperature and the set temperature after the lapse of the predetermined stop time is within a predetermined range. Depends on whether or not is less than a predetermined humidity (here 60%). That is, if the indoor humidity is lower than the predetermined humidity, the comfort of the indoor environment can be maintained, so that the reheat dehumidification operation time is shortened, and if it is higher than the predetermined humidity, the comfort is inferior, so the reheat dehumidification operation time is It is set to be long.

  In the above embodiment, the setting of the stop time of the reheat dehumidifying operation is set according to the difference between the room temperature and the set temperature (ΔT), but an example using the outside air temperature is another example. is there. This is different from step S104 in the flowchart of FIG. 4 and will be described by replacing step S104.

  In step S104, the control unit 20 determines that the current outside air temperature does not exceed a certain outside air temperature (for example, 30 ° C.) by the outside air temperature sensor 21 (Yes in step S104). For example, 10 minutes is set (step S105), and when the outside air room temperature exceeds 30 ° C. (No in step S104), the compressor operation stop time is set to B (for example, 5 minutes) (step S106). ), The operation of the compressor is stopped (step S107).

  That is, here, it is distinguished whether the outside air temperature is a constant temperature of 30 ° C. or less, and when the outside air temperature is high (over 30 ° C.), the temperature difference from the room temperature becomes large, and the compressor 10 is stopped. Since the time during which the comfort of the indoor environment can be maintained tends to be shortened, the stop time of the compressor 10 is shortened, and the stop time is increased when the temperature is 30 ° C. or lower.

  And in a present Example, while the compressor 10 is stopped after a reheat dehumidification driving | operation, the control part 20 is controlled so that the driving | operation of the indoor air blower 14 may be continued. As shown in FIG. 3, since the temperature of the sensation is influenced not only by the temperature and humidity but also by the wind speed, the user can feel more comfortable by continuing the air blowing operation even when the compressor 10 is stopped. Because it can.

  As a result of controlling the air conditioner according to the present embodiment as described above, the power consumption during the reheat dehumidification operation is intermittent at an appropriate timing despite the reheat dehumidification operation as shown in FIG. It becomes possible to perform the operation, and the power consumption during the conventional reheat dehumidifying operation shown in FIG. 9 can be greatly reduced. In this embodiment, the stop time is set with reference to the outside air temperature, which is the cause of temperature rise, so the compressor operation and stop are controlled in such a way as to suppress the change in room temperature as much as possible according to the actual environmental conditions. It becomes possible to do. By controlling in this way, as shown in FIG. 6, the change in the room temperature in this example is 28 ° C. to 29 ° C., and the temperature difference (ΔT) between the room temperature and the set temperature is within the range of + 1 ° C. On the other hand, the change in room temperature during the cooling and dehumidifying operation shown in FIG. 8 is 26 ° C. to 30 ° C., and the difference (ΔT) between the room temperature and the set temperature has a range of ± 2 ° C. However, more comfort can be obtained by reducing the temperature change.

  In the present embodiment, as shown in FIG. 4, an example in which the stop time and the operation time of the reheat dehumidification operation are selected from two types has been shown, but the present invention is not limited to this, and the condition setting is further subdivided. It may be increased depending on the situation.

  In the present embodiment, the operation time at the start of the first reheat dehumidification operation has been described as a previously stored time. However, the indoor humidity sensor 16 detects the indoor humidity (RH) at the start of the operation, and the indoor humidity Control may be performed so as to select the operation time stored in advance according to the above.

  In this embodiment, the reheat dehumidifying operation is performed using the configuration of the refrigeration cycle as shown in FIG. 1, but is not limited to this configuration. For example, in the case of an air conditioner that does not have a heating operation function However, a four-way valve is not necessary for this, but the same effect as in the present invention can be obtained without the four-way valve.

  Further, in the present embodiment, as shown in FIG. 2, the description has been made with the single control unit 20, but the control unit 20 is configured to have a control unit on each of the indoor unit side and the outdoor unit side, and the air conditioning is controlled in cooperation with each other. You may do it.

  In the present embodiment, when the reheat dehumidifying operation is performed, the control unit 20 performs control so as to continue the operation of the indoor blower 14 while the compressor 10 is stopped. The wind direction may be controlled. For example, about the wind speed when the compressor 10 is stopped, the comfort during the operation stop of the compressor 10 is compensated by controlling the wind speed to be the same as that during the operation of the compressor 10 or higher than that during the operation. Is possible. Further, since the wind direction when the compressor 10 is stopped also affects the temperature of the sensible temperature, it is desirable to blow air as much as possible to people. For this reason, for example, although not shown in FIG. 1, a human sensor for detecting the presence of a person is provided on the front surface of the air conditioner, and the indoor blown air Y can be driven in any direction. By configuring the control unit 20 so that at least the direction of the wind while the compressor is not operating is blown to a direction where a person is present, the comfort (cool wind feeling) when the compressor 10 is stopped is further enhanced. It becomes possible.

  As described above, the air conditioner according to the present invention is useful for an air conditioner capable of reheat dehumidification operation, and in particular, changes in temperature with respect to a set temperature while reducing power consumption during reheat dehumidification operation. It is suitable for an air conditioner with high comfort and low dehumidification ability.

DESCRIPTION OF SYMBOLS 10 Compressor 11 Outdoor heat exchanger 12 1st indoor heat exchanger 13 2nd indoor heat exchanger 14 Indoor air blower 15 Indoor temperature sensor 16 Indoor humidity sensor 17 Remote control 18 Memory 19 Timing part 20 Control part 21 Outside temperature sensor 22 Four way valve 23 Outdoor electronic expansion valve (pressure reducer)
24 Indoor electronic expansion valve (pressure reducer)
25 1st solenoid valve 26 2nd solenoid valve 27 Various valve opening-and-closing part 28 Receiving part 29 Outdoor blower 30 Indoor side heat exchanger 40 Air conditioner

Claims (5)

A refrigeration cycle including a compressor, an indoor heat exchanger, and an outdoor heat exchanger, wherein the indoor heat exchanger is connected to a first indoor heat exchanger and a second indoor heat exchange connected via an expansion valve having a pressure reducing function. An air conditioner capable of reheating and dehumidifying operation in which the first indoor heat exchanger acts as a heater and the second indoor heat exchanger acts as a cooler,
An indoor temperature sensor for detecting the indoor temperature;
A timekeeping section for measuring time,
A control unit for controlling the refrigeration cycle and the units,
During the reheat dehumidification operation,
If the room temperature detected by the temperature sensor is within a predetermined range of a preset temperature after a lapse of a predetermined time from the start of the reheat dehumidifying operation, the control unit operates the compressor. An air conditioner characterized by being stopped for a certain period of time. According to the difference between the room temperature and the set temperature, the storage unit further stores a plurality of stop times having different lengths of the compressor,
The control unit selects a stop time stored in the storage unit according to a temperature difference between the indoor temperature detected by the indoor temperature sensor and the set temperature when stopping the operation of the compressor. The air conditioner according to claim 1, wherein the compressor is controlled. An outside temperature sensor for detecting the outside temperature;
A storage unit storing a plurality of stop times with different lengths of the compressor according to the outside air temperature;
The control unit divides the temperature difference between the room temperature detected by the room temperature sensor and the outside temperature detected by the outside temperature sensor into the same number as the number of stop times stored in the storage unit, 2. The air conditioner according to claim 1, wherein the compressor is controlled to be stopped by selecting from the longest stop time to the shortest corresponding to the order from the smallest to the largest. An indoor humidity sensor for detecting indoor humidity;
A storage unit that stores a plurality of operating times having different lengths of the compressor according to indoor humidity;
The control unit controls the compressor by selecting an operation time stored in the storage unit according to the indoor humidity detected by the indoor humidity sensor when the reheat dehumidifying operation is started. The air conditioner according to claim 1. With an indoor blower,
The air conditioner according to any one of claims 1 to 4, wherein the control unit controls the operation of the indoor blower to be continued while the operation of the compressor is stopped.

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