JP2015059691A - Air conditioner and air conditioning system - Google Patents

Air conditioner and air conditioning system Download PDF

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JP2015059691A
JP2015059691A JP2013193348A JP2013193348A JP2015059691A JP 2015059691 A JP2015059691 A JP 2015059691A JP 2013193348 A JP2013193348 A JP 2013193348A JP 2013193348 A JP2013193348 A JP 2013193348A JP 2015059691 A JP2015059691 A JP 2015059691A
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indoor
temperature
indoor unit
air conditioner
determination value
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JP6071823B2 (en
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智伸 井崎
Tomonobu Izaki
智伸 井崎
昌彦 高木
Masahiko Takagi
昌彦 高木
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To acquire an air conditioner and the like capable of optimizing timing of compressor frequency restriction and capable of suppressing cooling capacity suppression to a necessary minimum, in performing dew condensation avoidance of an indoor unit.SOLUTION: The air conditioner includes: an outdoor unit 1 having a variable displacement compressor; an indoor unit 2 having an indoor heat exchanger 21; a liquid pipe temperature sensor 25 for detecting an operational state temperature of the indoor unit 2; a temperature/humidity sensor 24 for detecting a temperature and humidity of indoor air; and a control device 40 for performing dew condensation avoidance control for avoiding dew condensation in the indoor unit 2 in the case where dew condensation is predicted to occur in the indoor unit 2 during a cooling operation. The control device 40 sets a determination value for determining whether or not dew condensation occurs in the indoor unit 2 on the basis of the temperature and humidity detected by the temperature/humidity sensor 24 during the cooling operation, and when an indoor heat exchanger temperature (liquid pipe temperature) of the indoor unit 2 detected by the liquid pipe temperature sensor 25 is equal to or less than the determination value, it performs dew condensation avoidance control for controlling compressor frequency so that the indoor heat exchanger temperature of the indoor unit 2 surpasses the determination value.

Description

この発明は、空気調和機及び空気調和システムに関する。   The present invention relates to an air conditioner and an air conditioning system.

従来より、室内熱交換器の温度が室内機での結露発生の懸念される温度領域まで低下した場合、圧縮機周波数を制限し、室内機での結露を回避する手段が提案されている(特許文献1)。特許文献1では、外気温度が高いほど室内機での結露が生じやすい傾向があることに鑑み、外気温度が高いほど室内熱交換器の温度を高く保つように圧縮機周波数を制御している。具体的には、外気温度が所定温度よりも高い場合、室内熱交換器温度が、室内機で結露の生じる温度に至る前に、その温度よりも室内熱交換器温度が高くなるように圧縮機周波数の上限値を所定の周波数に制限している。   Conventionally, when the temperature of the indoor heat exchanger is lowered to a temperature range where condensation is likely to occur in the indoor unit, means for limiting the compressor frequency and avoiding condensation in the indoor unit has been proposed (patent) Reference 1). In Patent Document 1, in view of the tendency that condensation in an indoor unit tends to occur as the outdoor temperature increases, the compressor frequency is controlled so as to keep the temperature of the indoor heat exchanger higher as the outdoor temperature increases. Specifically, when the outdoor air temperature is higher than a predetermined temperature, the compressor is set so that the indoor heat exchanger temperature becomes higher than the temperature before the indoor heat exchanger temperature reaches the temperature at which condensation occurs in the indoor unit. The upper limit value of the frequency is limited to a predetermined frequency.

特許第2945730号公報(第3頁、図7)Japanese Patent No. 2945730 (page 3, FIG. 7)

特許文献1のように、室内機での結露回避手段として、圧縮機周波数を制限して室内熱交換器温度を一定値以上に保つことは有効であるが、空気調和機としての冷房能力を抑制することになるため、本来必要な冷房能力が確保できなくなるリスクを伴う。そのため、圧縮機周波数制限は、必要でないタイミングでは実施しないことが望ましい。   As in Patent Document 1, it is effective to limit the compressor frequency and keep the indoor heat exchanger temperature above a certain value as a means of avoiding condensation in the indoor unit, but suppresses the cooling capacity as an air conditioner As a result, there is a risk that the originally required cooling capacity cannot be secured. Therefore, it is desirable not to implement the compressor frequency limitation at an unnecessary timing.

室内機での結露の発生は、室内機周囲の空気の温度・湿度の影響が大きい。それにも関わらず、特許文献1では室内機周囲の温湿度を考慮せずに室内熱交換器温度と外気温度とから圧縮機周波数制限の要否を判断しており、必要外に冷房能力を抑制する懸念がある。例えば、室内の空気状態が異なっていれば、室内熱交換器温度が同じでも結露の発生有無に差が生じるため、必要以上に冷房能力を抑制してしまうリスクがある。また、外気温度は室内の温湿度へ影響はするものの、最終的な室内の空気状態は部屋の用途や換気量で大きく変動するため、結露回避を目的とした圧縮機周波数制限の要否の判断材料としては不十分である。   The occurrence of condensation in the indoor unit is greatly affected by the temperature and humidity of the air around the indoor unit. Nevertheless, Patent Document 1 judges whether or not to limit the compressor frequency from the indoor heat exchanger temperature and the outside air temperature without considering the temperature and humidity around the indoor unit, and suppresses the cooling capacity beyond necessity. There are concerns. For example, if the indoor air conditions are different, there is a risk that the cooling capacity may be suppressed more than necessary because there is a difference in the presence or absence of condensation even if the indoor heat exchanger temperature is the same. In addition, although the outside air temperature affects the indoor temperature and humidity, the final indoor air condition varies greatly depending on the use of the room and the amount of ventilation, so it is necessary to determine whether or not to limit the compressor frequency to avoid condensation. It is insufficient as a material.

この発明はこのような点に鑑みなされたもので、室内機の結露回避を行うにあたり、圧縮機周波数の制限のタイミングを適切化し、冷房能力抑制を必要最低限に抑えることが可能な空気調和機及び空気調和システムを得ることを目的とする。   The present invention has been made in view of the above points, and in performing condensation avoidance of an indoor unit, an air conditioner capable of optimizing the timing of limiting the compressor frequency and suppressing the cooling capacity to the minimum necessary. And to obtain an air conditioning system.

この発明に係る空気調和機は、容量可変型の圧縮機を有する室外機と、室内熱交換器を有する室内機と、室内機の運転状態温度を検知する運転状態温度検知手段と、室内空気の温湿度を検知する室内温湿度検知手段と、冷房運転時において室内機に結露が発生すると予測される場合に室内機の結露を回避する結露回避制御を行う制御装置とを備え、制御装置は、冷房運転時に、室内温湿度検知手段により検知された室内空気の温湿度に基づいて室内機に結露が発生するか否かを判定するための判定値を設定し、運転状態温度検知手段で検知された室内機の運転状態温度が判定値以下の場合、室内機の運転状態温度が判定値を上回るように圧縮機周波数を制御する結露回避制御を行うものである。   An air conditioner according to the present invention includes an outdoor unit having a variable capacity compressor, an indoor unit having an indoor heat exchanger, an operating state temperature detecting means for detecting an operating state temperature of the indoor unit, A temperature / humidity detection unit that detects temperature and humidity, and a control device that performs condensation avoidance control that prevents condensation of the indoor unit when condensation is predicted to occur in the indoor unit during cooling operation. During cooling operation, a determination value is set for determining whether or not condensation occurs in the indoor unit based on the temperature and humidity of the indoor air detected by the indoor temperature and humidity detection means, and is detected by the operating state temperature detection means. When the operation state temperature of the indoor unit is equal to or lower than the determination value, condensation avoidance control is performed to control the compressor frequency so that the operation state temperature of the indoor unit exceeds the determination value.

この発明によれば、室内機の結露回避を行うにあたり、圧縮機周波数の制限のタイミングを適切化し、冷房能力抑制を必要最低限に抑えることができる。   According to the present invention, when the condensation of the indoor unit is avoided, the timing of limiting the compressor frequency can be made appropriate and the cooling capacity can be suppressed to the minimum necessary.

この発明の一実施の形態に係る空気調和機の構成を示す図である。It is a figure which shows the structure of the air conditioner which concerns on one embodiment of this invention. 判定表(室内熱交換器温度)の一例を示す図である。It is a figure which shows an example of the determination table (indoor heat exchanger temperature). この発明の一実施の形態に係る空気調和機の冷房運転時の結露回避制御のフローチャートである。It is a flowchart of the dew condensation avoidance control at the time of air_conditioning | cooling driving | operation of the air conditioner which concerns on one embodiment of this invention. 結露回避制御中であることを示すアイコンの表示例を示す図である。It is a figure which shows the example of a display of the icon which shows that it is under dew condensation avoidance control. 運転風量に応じた補正表の一例を示す図である。It is a figure which shows an example of the correction table | surface according to a driving | running air volume. 判定表(吹出空気温度)の一例を示す図である。It is a figure which shows an example of the determination table (blowing air temperature). この発明の一実施の形態に係る空気調和機の冷房運転時の結露回避制御のフローチャートである。It is a flowchart of the dew condensation avoidance control at the time of air_conditioning | cooling driving | operation of the air conditioner which concerns on one embodiment of this invention. 結露回避のために圧縮機周波数を抑制する要因となっている室内機を確認する際のリモートコントローラー画面の一例を示す図である。It is a figure which shows an example of the remote controller screen at the time of confirming the indoor unit which is a factor which suppresses a compressor frequency in order to avoid dew condensation. この発明の一実施の形態に係る空気調和機に他の空気調和機が接続された空気調和システムの構成を示す図である。It is a figure which shows the structure of the air conditioning system by which the other air conditioner was connected to the air conditioner which concerns on one embodiment of this invention.

図1は、この発明の一実施の形態に係る空気調和機の構成を示す図である。図1及び後述の図において、同一の符号を付したものは、同一の又はこれに相当するものであり、これは明細書の全文において共通している。
空気調和機100は、1台の室外機1と、この室外機1に並列に接続された複数の室内機2A,2B,2C(以下、総称して室内機2とする場合がある。)とを備えている。空気調和機100の冷凍サイクルは、室外機1と、室内機2A,2B,2Cとが接続されることによって構成されている。ここでは、室内機2A,2Bが空調対象エリア31に配置され、室内機2Cが空調対象エリア32に配置されている。また、室内機2の接続台数はここでは3台の例を示しているが、1台又は2台でもよいし、更に複数でもよい。
FIG. 1 is a diagram showing a configuration of an air conditioner according to an embodiment of the present invention. In FIG. 1 and the drawings to be described later, the same reference numerals denote the same or corresponding parts, which are common throughout the entire specification.
The air conditioner 100 includes one outdoor unit 1 and a plurality of indoor units 2A, 2B, and 2C (hereinafter, collectively referred to as an indoor unit 2) connected in parallel to the outdoor unit 1. It has. The refrigeration cycle of the air conditioner 100 is configured by connecting the outdoor unit 1 and the indoor units 2A, 2B, and 2C. Here, the indoor units 2A and 2B are arranged in the air conditioning target area 31, and the indoor unit 2C is arranged in the air conditioning target area 32. In addition, the number of connected indoor units 2 is shown here as an example, but may be one or two, or may be a plurality.

室外機1は、容量(周波数)可変型の圧縮機11と、四方切換弁12と、室外熱交換器13と、電子膨張弁14と、圧縮機吸入側に設けられたアキュームレーター15と、室外送風機10とを備えている。   The outdoor unit 1 includes a variable capacity (frequency) compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an electronic expansion valve 14, an accumulator 15 provided on the compressor suction side, And a blower 10.

室内機2A,2B,2Cは、室内熱交換器21A,21B,21C(以下、総称して室内熱交換器21とする場合がある。)と、室内熱交換器21A,21B,21Cに空気を送風する室内送風機22A,22B,22C(以下、総称して室内送風機22とする場合がある。)と、電子膨張弁23A,23B,23C(以下、総称して電子膨張弁23とする場合がある。)とを備えている。室内機2A,2B,2Cは、電子膨張弁23A,23B,23Cにより個別に冷媒の流量を調整することが可能である。また、室内機2A,2B,2Cにはリモートコントローラー26A,26B,26Cが接続されており、室内機2A,2B,2Cのそれぞれに個別に運転指示を与えることを可能としている。   The indoor units 2A, 2B, 2C send air to the indoor heat exchangers 21A, 21B, 21C (hereinafter sometimes collectively referred to as the indoor heat exchanger 21) and the indoor heat exchangers 21A, 21B, 21C. The indoor blowers 22A, 22B, and 22C (hereinafter collectively referred to as the indoor blower 22) for blowing air and the electronic expansion valves 23A, 23B, and 23C (hereinafter collectively referred to as the electronic expansion valve 23). .). The indoor units 2A, 2B, and 2C can individually adjust the flow rate of the refrigerant by the electronic expansion valves 23A, 23B, and 23C. In addition, remote controllers 26A, 26B, and 26C are connected to the indoor units 2A, 2B, and 2C, and it is possible to individually give operation instructions to the indoor units 2A, 2B, and 2C.

また、室内機2A,2B,2Cには、空調対象エリア内(以下、室内という)の空気温度及び空気湿度を検知する室内温湿度検知手段としての温湿度センサー24A,24B,24C(以下、総称して温湿度センサー24とする場合がある。)と、室内熱交換器21A,21B,21Cの温度(液管の温度)を検知する運転状態温度検知手段としての液管温度センサー25A,25B,25C(以下、総称して液管温度センサー25とする場合がある。)とを備えている。   The indoor units 2A, 2B, and 2C include temperature / humidity sensors 24A, 24B, and 24C (hereinafter collectively referred to as indoor temperature / humidity detection means) that detect air temperature and air humidity within an air-conditioning target area (hereinafter referred to as a room). And temperature / humidity sensor 24.) and liquid tube temperature sensors 25A, 25B as operating state temperature detecting means for detecting the temperature (temperature of the liquid tube) of the indoor heat exchangers 21A, 21B, 21C. 25C (hereinafter collectively referred to as a liquid tube temperature sensor 25 in some cases).

この空気調和機100は、四方切換弁12の切り換えにより冷房運転又は暖房運転が可能に構成されているが、少なくとも冷房運転が可能であればよく、よって、四方切換弁12は必ずしも必須の構成ではなく、省略可能である。   The air conditioner 100 is configured to be capable of cooling operation or heating operation by switching the four-way switching valve 12, but it is sufficient that at least cooling operation is possible. Therefore, the four-way switching valve 12 is not necessarily indispensable. And can be omitted.

この空気調和機100には更に、空気調和機全体を制御する制御装置40が設けられている。制御装置40はマイクロコンピュータで構成され、通常運転(冷房、暖房)の各運転モードの制御に対応したプログラムと、冷房運転中に行われる制御であって、室内機2の結露を回避する後述の結露回避制御に対応したプログラムと、結露回避制御で使用する後述の判定表等とが記憶されている。   The air conditioner 100 is further provided with a control device 40 that controls the entire air conditioner. The control device 40 is configured by a microcomputer, and is a program corresponding to control of each operation mode of normal operation (cooling and heating) and control performed during the cooling operation, which will be described later to avoid condensation of the indoor unit 2. A program corresponding to the dew condensation avoidance control and a later-described determination table used in the dew condensation avoidance control are stored.

制御装置40は、空気調和機100内の各温度センサーからの各検知信号を受けており、その各検知信号に基づいて通常運転(冷房、暖房)を行う。また、制御装置40は、各室内機2で必要とされる空調能力を発揮できるように、冷房運転時は目標蒸発温度、暖房運転時は目標凝縮温度を決定している。ここでは、リモートコントローラー26にて設定された設定温度と温湿度センサー24で検知された室内空気温度との温度差ΔTに応じて目標蒸発温度(冷房運転時)又は目標凝縮温度(暖房運転時)が決定される。   The control device 40 receives each detection signal from each temperature sensor in the air conditioner 100, and performs normal operation (cooling, heating) based on each detection signal. Moreover, the control apparatus 40 determines the target evaporation temperature at the time of air_conditionaing | cooling operation and the target condensation temperature at the time of heating operation so that the air conditioning capability required by each indoor unit 2 can be exhibited. Here, a target evaporation temperature (during cooling operation) or a target condensing temperature (during heating operation) according to the temperature difference ΔT between the set temperature set by the remote controller 26 and the indoor air temperature detected by the temperature / humidity sensor 24. Is determined.

そして、制御装置40は、その目標蒸発温度又は目標凝縮温度となるように圧縮機11の周波数を制御する。ここでは、複数の室内機2が備えられているため、各室内機2のうち、最も温度差ΔTが大きいものに合わせて目標蒸発温度又は目標凝縮温度が設定され、その目標蒸発温度又は目標凝縮温度となるように圧縮機11の周波数を制御している(この制御は、後述の図3、図7のフローチャートの「通常時圧縮機周波数制御」に相当)。そして、制御装置40は、過熱度(冷房運転時)又は過冷却度(暖房運転時)が目標値となるように各室内機2の電子膨張弁23の開度を個別に制御する。   And the control apparatus 40 controls the frequency of the compressor 11 so that it may become the target evaporation temperature or target condensation temperature. Here, since the plurality of indoor units 2 are provided, the target evaporation temperature or the target condensation temperature is set according to the indoor unit 2 having the largest temperature difference ΔT, and the target evaporation temperature or the target condensation is set. The frequency of the compressor 11 is controlled so as to reach the temperature (this control corresponds to “normal compressor frequency control” in the flowcharts of FIGS. 3 and 7 described later). And the control apparatus 40 controls the opening degree of the electronic expansion valve 23 of each indoor unit 2 separately so that a superheat degree (at the time of cooling operation) or a supercooling degree (at the time of heating operation) may become a target value.

また、制御装置40は、冷房運転中、温湿度センサー24からの検知信号に基づいて室内機2の結露が予測されるかどうかを判断し、室内機2の結露が予測される場合、室内機2の結露を回避するための結露回避制御を行う。この結露回避制御の詳細については改めて説明する。   Further, the control device 40 determines whether or not condensation of the indoor unit 2 is predicted based on a detection signal from the temperature / humidity sensor 24 during the cooling operation, and when the condensation of the indoor unit 2 is predicted, Condensation avoidance control for avoiding the condensation of 2 is performed. Details of this dew condensation avoidance control will be described again.

なお、図1には室外機1のみに制御装置40を設けた構成を図示しているが、各室内機2に制御装置40の機能の一部を持つ室内制御装置を設け、制御装置40と室内制御装置との間でデータ通信を行うことにより連携処理を行う構成にしてもよい。   Although FIG. 1 illustrates a configuration in which the control device 40 is provided only in the outdoor unit 1, each indoor unit 2 is provided with an indoor control device having a part of the function of the control device 40. You may make it the structure which performs a cooperation process by performing data communication between indoor control apparatuses.

次に、空気調和機100の冷凍サイクルの動作について説明する。   Next, the operation of the refrigeration cycle of the air conditioner 100 will be described.

(冷房運転)
空気調和機100において、冷房運転時、圧縮機11で圧縮された冷媒は高温高圧のガス冷媒となり、四方切換弁12を通り室外熱交換器13に送り込まれる。室外熱交換器13に流入した冷媒は、室外送風機10で搬送される室外空気と熱交換し、放熱することにより液化する。液化した冷媒は電子膨張弁14及び電子膨張弁23で減圧されて気液二相状態となり、それぞれ室内熱交換器21に流入する。室内熱交換器21に流入した冷媒は、室内送風機22で搬送される室内の空気と熱交換し、吸熱することによりガス化し、圧縮機11へ戻される。以上のように冷媒が冷媒回路を循環することにより冷房運転を行う。また、各室内機2がそれぞれに電子膨張弁23を持つことで、各室内機2への冷媒流量が調整されるようになっている。
(Cooling operation)
In the air conditioner 100, during the cooling operation, the refrigerant compressed by the compressor 11 becomes a high-temperature and high-pressure gas refrigerant, which is sent to the outdoor heat exchanger 13 through the four-way switching valve 12. The refrigerant flowing into the outdoor heat exchanger 13 is liquefied by exchanging heat with the outdoor air conveyed by the outdoor blower 10 and radiating heat. The liquefied refrigerant is decompressed by the electronic expansion valve 14 and the electronic expansion valve 23 to become a gas-liquid two-phase state, and flows into the indoor heat exchanger 21 respectively. The refrigerant that has flowed into the indoor heat exchanger 21 exchanges heat with the indoor air conveyed by the indoor blower 22, gasifies by absorbing heat, and is returned to the compressor 11. As described above, the refrigerant circulates through the refrigerant circuit to perform the cooling operation. Moreover, each indoor unit 2 has the electronic expansion valve 23 in each, and the refrigerant | coolant flow rate to each indoor unit 2 is adjusted.

次に、この発明の特徴である結露回避制御の考え方について説明する。
室内機2の結露は、室内の空気状態(温度、湿度)の影響が大きく、室内空気温度が高いほど、また、室内空気湿度が高いほど、室内機2の結露が生じやすくなる。逆に言えば、室内空気温度が低いほど、室内空気湿度が低いほど、結露し難いといえる。
Next, the concept of condensation avoidance control, which is a feature of the present invention, will be described.
Condensation of the indoor unit 2 is greatly affected by the indoor air condition (temperature, humidity), and the higher the indoor air temperature and the higher the indoor air humidity, the easier the condensation of the indoor unit 2 occurs. Conversely, it can be said that the lower the indoor air temperature and the lower the indoor air humidity, the harder the condensation.

上述した従来制御では、外気温度が所定温度よりも高い場合、露点温度が高く、いわば結露が生じやすい室内環境にあると判断して室内熱交換器温度を一定値以上に保つ制御を行っている。しかし、上述したように外気温度は室内の温湿度へ影響はするものの、最終的な室内の空気状態は部屋の用途や換気量で大きく変動する。このため、外気温度が高くても室内空気温度や室内空気湿度が低く、つまり露点温度が低くて結露が発生し難い環境である場合もある。従来制御ではこの点を考慮していないため、必要以上に結露回避を優先した制御となり、快適性が低下する可能性がある。   In the above-described conventional control, when the outside air temperature is higher than the predetermined temperature, the dew point temperature is high, so to speak, it is determined that the indoor environment is likely to cause condensation, and control is performed to keep the indoor heat exchanger temperature above a certain value. . However, as described above, although the outside air temperature affects the indoor temperature and humidity, the final indoor air condition varies greatly depending on the use of the room and the ventilation amount. For this reason, even if the outside air temperature is high, the room air temperature and the room air humidity are low, that is, the dew point temperature is low and it may be an environment in which condensation does not easily occur. Since conventional control does not take this point into consideration, the control gives priority to avoiding condensation more than necessary, and comfort may be reduced.

そこで、この実施の形態では、室内空気の温湿度に応じた、室内機2に結露が発生する温度(つまり、室内機2に結露が発生するか否かを判定するための温度であって、以下、判定値という)を設定し、室内機2の運転状態温度(例えば、室内熱交換器の温度)がその判定値以下の場合、結露回避制御を開始する。   Therefore, in this embodiment, the temperature at which condensation occurs in the indoor unit 2 according to the temperature and humidity of the indoor air (that is, the temperature for determining whether or not condensation occurs in the indoor unit 2, Hereinafter, when the operation state temperature of the indoor unit 2 (for example, the temperature of the indoor heat exchanger) is equal to or lower than the determination value, the dew condensation avoidance control is started.

ここで、この判定値は、具体的には室内空気の温湿度に応じた「露点温度」又は後述の「露点温度よりも僅かに低い温度」に相当し、室内機2の運転状態温度(例えば、室内熱交換器の温度)が判定値以下の場合、結露回避制御として、室内熱交換器温度が判定値を上回るように圧縮機周波数を制御する。この圧縮機周波数の制御は、具体的には圧縮機周波数を現在値から段階的に下げて室内熱交換器温度が判定値を上回るようにする制御である。   Here, this determination value specifically corresponds to a “dew point temperature” corresponding to the temperature and humidity of the room air or a “temperature slightly lower than the dew point temperature” described later, and the operation state temperature of the indoor unit 2 (for example, When the temperature of the indoor heat exchanger is equal to or lower than the determination value, the compressor frequency is controlled such that the indoor heat exchanger temperature exceeds the determination value as dew condensation avoidance control. This control of the compressor frequency is specifically a control in which the compressor frequency is lowered stepwise from the current value so that the indoor heat exchanger temperature exceeds the determination value.

図2は、判定表(室内熱交換器温度)の一例を示す図である。
判定表は、実運転中に温湿度センサー24で検知した室内空気温度と室内空気湿度とに基づいて判定値を設定するための表である。判定値は、室内機2の運転状態温度で設定され、ここでは室内熱交換器温度で設定されている。判定表は予め制御装置40に記憶されている。なお、図2に示した判定値の数値は一例であり、室内機2の形態・構造により異なってくるが、どの場合も、室内空気温度が低いほど、室内空気湿度が低いほど、低い値となる。
FIG. 2 is a diagram illustrating an example of a determination table (indoor heat exchanger temperature).
The determination table is a table for setting a determination value based on the indoor air temperature and the indoor air humidity detected by the temperature / humidity sensor 24 during actual operation. The determination value is set by the operating state temperature of the indoor unit 2, and here is set by the indoor heat exchanger temperature. The determination table is stored in the control device 40 in advance. The numerical value of the judgment value shown in FIG. 2 is an example and varies depending on the form and structure of the indoor unit 2. In any case, the lower the indoor air temperature and the lower the indoor air humidity, the lower the value. Become.

結露回避制御は、室内熱交換器温度が判定値を上回るようにする制御であり、判定値は、言い方を変えれば、結露回避制御中に室内熱交換器温度が取り得る許容温度範囲の下限値に相当する。よって、この下限値が低い程、圧縮機周波数の制限を緩和でき、より高い冷房能力が許容されることになる。   Condensation avoidance control is control that causes the indoor heat exchanger temperature to exceed the judgment value.In other words, the judgment value is the lower limit of the allowable temperature range that the indoor heat exchanger temperature can take during condensation prevention control. It corresponds to. Therefore, the lower the lower limit value, the more the restriction on the compressor frequency can be relaxed and the higher cooling capacity is allowed.

判定値は、上述したように室内空気の温湿度に応じた「露点温度」又は「露点温度よりも僅かに低い温度」に相当するが、「露点温度」に限らず「露点温度よりも僅かに低い温度」としてもよい理由について説明する。通常、室内機2に結露が生じるのは室内機2が露点温度以下になった場合と考えられるが、実際上は、露点温度よりも低い温度でも、結露が生じないこともある。そこで、予めシミュレーション等で室内熱交換器で実際に結露が生じる温度を求めることで、その温度(つまり、「露点温度よりも僅かに低い温度」)を判定値としてもよい。このように判定値を「露点温度よりも僅かに低い温度」とした場合、「露点温度」とした場合よりも、結露回避制御中に室内熱交換器温度が取り得る許容温度範囲の下限値を低くすることができるため、冷房能力抑制を更に必要最低限に抑えることが可能となる。   The judgment value corresponds to the “dew point temperature” or “slightly lower temperature than the dew point temperature” according to the temperature and humidity of the room air as described above, but is not limited to the “dew point temperature” and is slightly lower than the “dew point temperature”. The reason why “low temperature” may be used will be described. Normally, it is considered that condensation occurs in the indoor unit 2 when the indoor unit 2 is below the dew point temperature. However, in practice, condensation may not occur even at a temperature lower than the dew point temperature. Therefore, the temperature (that is, “slightly lower than the dew point temperature”) may be used as the determination value by obtaining in advance a temperature at which condensation actually occurs in the indoor heat exchanger by simulation or the like. In this way, when the determination value is set to “slightly lower than the dew point temperature”, the lower limit value of the allowable temperature range that the indoor heat exchanger temperature can take during the dew condensation avoidance control is set, compared with the case where the determination value is set to “dew point temperature”. Since it can be lowered, it becomes possible to further suppress the cooling capacity suppression to the minimum necessary.

なお、冷房運転中に室内空気温度及び室内空気湿度に基づいて判定値を設定するにあたっては、上記したように判定表を用いて設定する方法に限らず、室内空気温度及び室内空気湿度と判定値との関係式を予め記憶しておき、関係式に基づいて設定する等としてもよい。   In addition, when setting the determination value based on the indoor air temperature and the indoor air humidity during the cooling operation, the determination value is not limited to the method using the determination table as described above, and the indoor air temperature and the indoor air humidity and the determination value are set. May be stored in advance and set based on the relational expression.

図3は、この発明の一実施の形態に係る空気調和機の冷房運転時の結露回避制御のフローチャートである。図4は、結露回避制御中であることを示すアイコンの表示例を示す図である。以下、空気調和機100の冷房運転時の結露回避制御について説明する。なお、冷房運転中、制御装置40は、リモートコントローラー26にて設定された設定温度と温湿度センサー24で検知された室内空気温度との温度差ΔTに応じた「通常時の圧縮機制御」を行っている。   FIG. 3 is a flowchart of the dew condensation avoidance control during the cooling operation of the air conditioner according to the embodiment of the present invention. FIG. 4 is a diagram illustrating a display example of an icon indicating that the condensation avoidance control is being performed. Hereinafter, the dew condensation avoidance control during the cooling operation of the air conditioner 100 will be described. During the cooling operation, the control device 40 performs “normal compressor control” according to the temperature difference ΔT between the set temperature set by the remote controller 26 and the indoor air temperature detected by the temperature / humidity sensor 24. Is going.

制御装置40は、冷房運転中、各室内機2のそれぞれの温湿度センサー24からの各室内の温湿度と、液管温度センサー25からの液管温度(室内熱交換器温度)とを検知する(S1〜S3)。そして、各室内の温湿度に基づいて上述のようにして各室内機2毎に、それぞれ対応の判定値を設定する(S4)。すなわち、各室内機2が設置された空調対象エリア31、32の室内環境に応じた判定値を設定する。そして、各室内機2のそれぞれ毎に、液管温度センサー25からの室内熱交換器温度が、対応の判定値以下であるか否かをチェックする。   The control device 40 detects the temperature and humidity in each room from the temperature and humidity sensor 24 of each indoor unit 2 and the liquid pipe temperature (indoor heat exchanger temperature) from the liquid pipe temperature sensor 25 during the cooling operation. (S1-S3). Then, a corresponding determination value is set for each indoor unit 2 based on the temperature and humidity in each room as described above (S4). That is, the determination value according to the indoor environment of the air-conditioning target areas 31 and 32 where the indoor units 2 are installed is set. Then, for each indoor unit 2, it is checked whether or not the indoor heat exchanger temperature from the liquid pipe temperature sensor 25 is equal to or less than the corresponding determination value.

制御装置40は、室内熱交換器温度が判定値以下となっている室内機2がないと判断した場合(S5)、上述の「通常時圧縮機周波数制御」を行う(S6)。一方、制御装置40は、室内熱交換器温度が判定値以下となっている室内機2があると判断した場合(つまり、室内機2の結露が予測されると判断した場合)(S5)、結露回避制御を開始し、例えば図4に示すような結露回避制御中であることを示すアイコン50を各リモートコントローラー26に表示する。   When it is determined that there is no indoor unit 2 whose indoor heat exchanger temperature is equal to or lower than the determination value (S5), the control device 40 performs the above-described “normal-time compressor frequency control” (S6). On the other hand, when it is determined that there is an indoor unit 2 in which the indoor heat exchanger temperature is equal to or lower than the determination value (that is, when it is determined that condensation of the indoor unit 2 is predicted) (S5), Condensation avoidance control is started and, for example, an icon 50 indicating that condensation avoidance control is in progress is displayed on each remote controller 26 as shown in FIG.

結露回避制御では、室内熱交換器温度が判定値以下となっている室内機2の室内熱交換器温度が判定値を上回るように圧縮機周波数を制御する。すなわち、まず、その室内機2の圧縮機周波数を所定値だけ下げる(S7)。この所定値は、制御上の最小STEP分である。但し、熱交換器の温度と判定値との乖離が大きい場合は、より大きく周波数を変化させるように所定値を大きくしてもよい。そして、制御装置40は、再度、室内の温湿度及び室内熱交換器温度を検知し(S1〜S3)、判定値の設定処理(S4)と、判定値による判定処理(S5)、圧縮機周波数を所定値だけ下げる処理(S7)とを行う。このS1〜S5、S7の処理を、対象の室内熱交換器温度が判定値を上回るまで繰り返す。そして、対象の室内熱交換器温度が判定値を上回ると、「通常時圧縮機周波数制御」を行う(S6)。すなわち、設定温度と温湿度センサー24で検知された室内空気温度との温度差ΔTに応じて圧縮機周波数を決定し、その圧縮機周波数で圧縮機11を運転させる。   In the condensation avoidance control, the compressor frequency is controlled so that the indoor heat exchanger temperature of the indoor unit 2 whose indoor heat exchanger temperature is equal to or lower than the determination value exceeds the determination value. That is, first, the compressor frequency of the indoor unit 2 is lowered by a predetermined value (S7). This predetermined value is the minimum STEP for control. However, when the difference between the temperature of the heat exchanger and the determination value is large, the predetermined value may be increased so as to change the frequency more greatly. Then, the control device 40 again detects the indoor temperature and humidity and the indoor heat exchanger temperature (S1 to S3), a determination value setting process (S4), a determination process based on the determination value (S5), and the compressor frequency And a process of lowering by a predetermined value (S7). The processes of S1 to S5 and S7 are repeated until the target indoor heat exchanger temperature exceeds the determination value. When the target indoor heat exchanger temperature exceeds the determination value, “normal compressor frequency control” is performed (S6). That is, the compressor frequency is determined according to the temperature difference ΔT between the set temperature and the indoor air temperature detected by the temperature / humidity sensor 24, and the compressor 11 is operated at the compressor frequency.

以上説明したようにこの実施の形態によれば、室内環境を表す室内空気温度及び室内空気湿度に基づいて室内機2に結露が発生するか否かを判定するための判定値を設定し、判定値を用いて室内機2に結露が発生するか否かを判定した上で、結露回避制御を開始するようにした。このように、室内環境を考慮して室内機2に結露が発生するか否かを的確に判断することで、結露回避制御を実施するタイミングを適切化し、空気調和機100としての冷房能力抑制を必要最低限に抑えた効果的な制御が可能となる。   As described above, according to this embodiment, the determination value for determining whether or not condensation occurs in the indoor unit 2 based on the indoor air temperature and the indoor air humidity representing the indoor environment is set. The condensation avoidance control is started after determining whether or not condensation occurs in the indoor unit 2 using the value. In this way, by appropriately determining whether or not condensation occurs in the indoor unit 2 in consideration of the indoor environment, the timing for performing the condensation avoidance control is optimized, and the cooling capacity of the air conditioner 100 is suppressed. Effective control can be performed with the minimum necessary.

また、判定値は、室内空気温度が低いほど、室内空気湿度が低いほど、低い値となるため、室内機2の結露回避を行うにあたり、圧縮機周波数を制限する程度を室内環境に応じて適正化でき、冷房能力抑制を必要最低限に抑えることが可能である。   In addition, the lower the indoor air temperature and the lower the indoor air humidity, the lower the judgment value becomes. Therefore, when the condensation of the indoor unit 2 is avoided, the degree of limiting the compressor frequency is appropriate according to the indoor environment. It is possible to suppress the cooling capacity suppression to the minimum necessary.

また、この実施の形態の結露回避制御では、圧縮機周波数を予め設定した所定値だけ下げて再度、室内機2の運転状態温度(室内熱交換器温度)と判定値とを比較する判断を繰り返し行うことで、室内機2の運転状態温度が判定値を上回るように制御するようにした。つまり、室内機2の運転状態温度の変化をチェックしながら圧縮機周波数を下げるようにしたので、上記従来制御のように圧縮機周波数範囲の上限値を所定の周波数に制限する場合に比べて、圧縮機周波数を必要以上に下げ過ぎて快適性を損なう不都合を回避できる。   In the dew condensation avoidance control according to this embodiment, the compressor frequency is lowered by a predetermined value set in advance, and the determination of comparing the operation state temperature (indoor heat exchanger temperature) of the indoor unit 2 with the determination value is repeated. By doing so, the operation state temperature of the indoor unit 2 was controlled to exceed the judgment value. That is, since the compressor frequency is lowered while checking the change in the operating state temperature of the indoor unit 2, compared to the case where the upper limit value of the compressor frequency range is limited to a predetermined frequency as in the conventional control, It is possible to avoid the disadvantage that the compressor frequency is lowered excessively and the comfort is impaired.

なお、この発明の制御は、上述の制御に限定されるものではなく、この発明の要旨を逸脱しない範囲で例えば以下の(1)〜(10)のように種々変形実施可能である。また、以下の変形例同士を適宜組み合わせてもよい。   Note that the control of the present invention is not limited to the above-described control, and various modifications such as the following (1) to (10) can be implemented without departing from the gist of the present invention. Moreover, you may combine the following modifications suitably.

(1)上記では、結露回避制御として、圧縮機周波数を予め設定した所定値だけ下げて再度、室内機2の運転状態温度と判定値とを比較する判断を繰り返し行うことで、室内機2の運転状態温度が判定値を上回るように制御するようにした。しかし、この実施の形態の結露回避制御は、この制御に限られたものではなく、要は、室内機2の運転状態温度が判定値を上回るように制御する方法であればよい。よって、従来制御と同様に圧縮機周波数範囲の上限値を所定の圧縮機周波数に制限する方法も、この発明に含むものとする。   (1) In the above description, as the dew condensation avoidance control, the compressor frequency is lowered by a predetermined value set in advance, and the determination of comparing the operation state temperature of the indoor unit 2 with the determination value is performed again, whereby the indoor unit 2 The operation state temperature is controlled to exceed the judgment value. However, the dew condensation avoidance control according to this embodiment is not limited to this control, and may be any method as long as the control is performed so that the operation state temperature of the indoor unit 2 exceeds the determination value. Therefore, a method of limiting the upper limit value of the compressor frequency range to a predetermined compressor frequency as in the conventional control is also included in the present invention.

(2)上記では、各室内機2のなかに、室内機2の運転状態温度が判定値以下となるものが存在した場合、圧縮機周波数を下げて、再度、判定値による判定を実施し、徐々に圧縮機周波数を下げながら、対象の室内機2の運転状態温度が判定値を上回るまで繰り返すとした。しかし、圧縮機周波数を下げて冷房能力を落とすことは、冷房能力不足により室内空気温度が設定温度まで下がらなくなってしまう可能性がある。この対策として、結露回避用の圧縮機周波数の下限値を予め設定しておき、室内空気温度と設定温度との温度差ΔTが予め設定した所定値(例えば、2〜5deg程度。ユーザーの意志により調整可能とする)よりも大きい場合には、圧縮機周波数を下限値よりは下げないようにすると共に、室内機2の風量設定を現在よりも自動的に上げて冷房能力を上げる機能を持たせるようにしてもよい。   (2) In the above, when there is one of the indoor units 2 in which the operating state temperature of the indoor unit 2 is equal to or lower than the determination value, the compressor frequency is lowered and the determination by the determination value is performed again. It was assumed that the operation state temperature of the target indoor unit 2 was repeated while gradually decreasing the compressor frequency until the temperature exceeded the determination value. However, reducing the compressor frequency by lowering the cooling capacity may cause the room air temperature to not drop to the set temperature due to insufficient cooling capacity. As a countermeasure, a lower limit value of the compressor frequency for preventing condensation is set in advance, and a temperature difference ΔT between the indoor air temperature and the set temperature is set to a predetermined value (for example, about 2 to 5 degrees. Depending on the user's will) If it is larger than the lower limit, the compressor frequency is not lowered below the lower limit value, and the air volume setting of the indoor unit 2 is automatically increased from the present to increase the cooling capacity. You may do it.

(3)室内機2の運転状態温度が判定値以下となっても、結露が成長するまでには時間を要する。このため、室内機2の運転状態温度が判定値以下となって直ぐに圧縮機周波数を下げるのではなく、室内機2の運転状態温度が判定値以下となったままで一定時間、そのままの運転を継続することを許容して、冷房能力を維持するようにしてもよい。   (3) Even if the operating state temperature of the indoor unit 2 is equal to or lower than the determination value, it takes time for the condensation to grow. For this reason, instead of immediately reducing the compressor frequency when the operating state temperature of the indoor unit 2 becomes equal to or lower than the determination value, the operation state temperature of the indoor unit 2 remains below the determination value and the operation is continued for a certain time. It may be allowed to maintain the cooling capacity.

(4)上記では、室内空気温度と室内空気湿度とに基づいて判定値を設定するようにしたが、この判定値を、ユーザーにより設定されている運転風量(強風・中風・弱風)に基づいて補正するようにしてもよい。運転風量が例えば「強風」に設定されている場合、「弱風」に設定されている場合に比べて、室内熱交換器温度が同じ温度であるときの吹出空気温度が高くなる。このため、「弱風」に設定されている場合よりも低い室内熱交換器温度まで許容するように補正する。   (4) In the above description, the determination value is set based on the indoor air temperature and the indoor air humidity. This determination value is set based on the operating air volume (strong wind, medium wind, and weak wind) set by the user. May be corrected. For example, when the operating air volume is set to “strong wind”, the blown air temperature when the indoor heat exchanger temperature is the same temperature is higher than when the operating air volume is set to “weak wind”. For this reason, it correct | amends so that the indoor heat exchanger temperature lower than the case where it is set to "weak wind" is accept | permitted.

風量Qと冷房能力Wとには以下の関係がある。よって、同一冷房能力のときに風量差が出ると風量が大きいときの方が、出口空気エンタルピーが高い(吹出空気温度が高い)状態になる。   The air volume Q and the cooling capacity W have the following relationship. Therefore, when there is a difference in the air volume when the cooling capacity is the same, the outlet air enthalpy is higher (the blown air temperature is higher) when the air volume is larger.

W=(h1−h0)×Q
ここで、
h1:入口空気エンタルピー、h0:出口空気エンタルピー
W = (h1-h0) × Q
here,
h1: Inlet air enthalpy, h0: Outlet air enthalpy

また、冷房能力は下記式でも表せる。
W=K×(tair−tcoil
ここで、K:伝熱効率、tair:空気温度、tcoil:熱交換器温度
The cooling capacity can also be expressed by the following formula.
W = K × (t air −t coil )
Where K: heat transfer efficiency, t air : air temperature, t coil : heat exchanger temperature

風量が大きいと吹出温度が高くなる分、冷房能力を上げてもよくなるため、熱交換器温度を下げてもよくなる。なお、厳密には、風量上昇で伝熱効率が向上するが、その上昇程度は小さく吹出温度が上がる現象が支配的になる。   If the air volume is large, the cooling capacity may be increased by the amount the blowing temperature increases, so the heat exchanger temperature may be lowered. Strictly speaking, the heat transfer efficiency is improved by increasing the air volume, but the increase is small, and the phenomenon that the blowing temperature rises becomes dominant.

図5は、運転風量に応じた補正表の一例を示す図である。
補正表には、風量設定毎に補正値が設定され、判定値に補正値を加算することで判定値を補正する。補正値は、補正後の判定値が、運転風量が大きくなるに連れて低くなるように設定されている。このように設定された補正表を用いて判定値を補正する際には、例えば、室内空気温度が24℃で室内空気湿度が62%とすると、まず、図2より判定値が「7℃」と決定される。そして、ここでは風量設定が「強風」であるとすると、補正値が「−2℃」であるため、判定値に補正値を加算して得た「5℃」が補正後の判定値となる。
FIG. 5 is a diagram illustrating an example of a correction table according to the operating air volume.
In the correction table, a correction value is set for each air volume setting, and the determination value is corrected by adding the correction value to the determination value. The correction value is set so that the corrected determination value decreases as the operating air volume increases. When correcting the determination value using the correction table set in this way, for example, if the indoor air temperature is 24 ° C. and the indoor air humidity is 62%, first, the determination value is “7 ° C.” from FIG. Is determined. If the air volume setting is “strong wind” here, the correction value is “−2 ° C.”, so “5 ° C.” obtained by adding the correction value to the determination value is the corrected determination value. .

このように運転風量に応じて判定値を補正することで、必要以上に冷房能力を抑制することを回避できる。   By correcting the determination value according to the operating air volume in this way, it is possible to avoid suppressing the cooling capacity more than necessary.

(5)この実施の形態では、室内機2の結露回避のために圧縮機周波数を落とし、冷房能力を落とすことを是としているが、設置環境・用途によっては結露保護よりも冷房能力の維持を最優先したいユーザーがいても不思議はない。その対応として、リモートコントローラー26からの設定指示やスイッチ操作により、室内機2に運転状態温度が判定値以下の場合に結露回避制御を行うか否かを簡単に切り換えられるようにしてもよい。   (5) In this embodiment, in order to avoid condensation in the indoor unit 2, the compressor frequency is lowered to reduce the cooling capacity. However, depending on the installation environment and application, the cooling capacity is maintained rather than the condensation protection. No wonder there is a user who wants to be the top priority. As a countermeasure, it may be possible to easily switch whether or not to perform the dew condensation avoidance control when the operation state temperature is equal to or lower than the determination value for the indoor unit 2 by a setting instruction or a switch operation from the remote controller 26.

具体的な構成としては、制御装置40が、結露回避制御の有効、無効を設定する設定手段を有し、有効に設定されている場合に限り、結露回避制御を行うようにすればよい。設定手段の設定は、ユーザー操作によって自由に行えるものとする。   As a specific configuration, the control device 40 has setting means for setting whether to enable or disable the condensation avoidance control, and only when it is set to be effective, the condensation avoidance control may be performed. The setting means can be freely set by a user operation.

このように結露回避制御を行うか否かをユーザー自身が簡単に切り換え可能としておくことで、すみやかに空気調和機100をユーザーの意図に沿った運転に切り換えることが可能となる。なお、図3(又は図7)の判定値の設定処理(S4、S4A)と、判定値による判定処理(S5、S5A)と、結露回避制御(S7)とをまとめて結露回避モードとし、結露回避モードのON/OFFをユーザー自身が簡単に切り換えできる構成としてもよい。   As described above, whether or not to perform the dew condensation avoidance control can be easily switched by the user himself / herself, so that the air conditioner 100 can be quickly switched to an operation in accordance with the user's intention. Note that the determination value setting process (S4, S4A), the determination process using the determination value (S5, S5A), and the condensation avoidance control (S7) in FIG. A configuration in which the user can easily switch ON / OFF of the avoidance mode may be employed.

(6)上記(5)では、結露回避よりも冷房能力の維持を最優先したいユーザーに対する対策として、結露回避制御そのものを無効にすることを可能とする対策であったが、別の対策として以下のようにしてもよい。すなわち、例えばリモートコントローラー26を利用したユーザー操作で判定値を下げることを可能としてもよい。言い換えれば、結露回避目的のための圧縮機周波数制限の程度を、ユーザー操作で緩和できるようにしてもよい。具体的な構成としては、制御装置40が、ユーザー操作に従って判定値を下げる圧縮機周波数制限緩和手段を備えた構成とすればよい。   (6) In the above (5), as a measure for the user who wants to give priority to the maintenance of the cooling capacity over the avoidance of condensation, it was possible to invalidate the condensation avoidance control itself. It may be as follows. That is, for example, the determination value may be lowered by a user operation using the remote controller 26. In other words, the degree of the compressor frequency limit for the purpose of preventing condensation may be reduced by a user operation. As a specific configuration, the control device 40 may be configured to include a compressor frequency limit mitigation unit that lowers the determination value according to a user operation.

(7)上記では、判定値を設定する「室内機2の運転状態温度」を室内熱交換器温度としたが、室内機2から吹き出される吹出空気の温度としてもよい。この場合、図1において点線で示したように、各室内機2に運転状態温度検知手段としての吹出空気温度センサー27A、27B、27C(以下、総称して吹出空気温度センサー27とする場合がある。)を備える。判定値として吹出空気温度を用いる場合の結露回避制御は、判定値として室内熱交換器温度を用いる場合と基本的に同様であり、図6及び図7を用いて簡単に説明する。   (7) In the above description, the “operating state temperature of the indoor unit 2” for setting the determination value is the indoor heat exchanger temperature, but it may be the temperature of the air blown from the indoor unit 2. In this case, as indicated by a dotted line in FIG. 1, each indoor unit 2 may have a blown air temperature sensor 27A, 27B, 27C (hereinafter collectively referred to as a blown air temperature sensor 27) as an operation state temperature detection unit. .). Condensation avoidance control when the blown air temperature is used as the determination value is basically the same as that when the indoor heat exchanger temperature is used as the determination value, and will be briefly described with reference to FIGS. 6 and 7.

図6は、判定表(吹出空気温度)の一例を示す図である。図7は、この発明の一実施の形態に係る空気調和機の冷房運転時の結露回避制御のフローチャートである。
判定表は、室内空気温度と室内空気湿度との組み合わせに応じて判定値を設定するための表であり、判定値は、ここでは吹出空気温度で設定されている。なお、図6に示した判定値の数値は一例であり、室内機2の形態・構造により異なってくるが、どの場合も、室内空気温度が低いほど、室内空気湿度が低いほど、低い値となる。また、判定値を設定するにあたっては、判定表を用いて設定する方法に限らず、室内空気温度及び室内空気湿度と判定値との関係式を予め記憶しておき、関係式に基づいて設定する等としてもよい。
FIG. 6 is a diagram illustrating an example of a determination table (blow air temperature). FIG. 7 is a flowchart of the dew condensation avoidance control during the cooling operation of the air conditioner according to the embodiment of the present invention.
The determination table is a table for setting a determination value according to the combination of the indoor air temperature and the indoor air humidity, and the determination value is set here as the blown air temperature. The numerical value of the judgment value shown in FIG. 6 is an example and varies depending on the form and structure of the indoor unit 2. In any case, the lower the indoor air temperature and the lower the indoor air humidity, the lower the value. Become. In setting the determination value, not only the method of setting using the determination table, but also the relational expressions of the indoor air temperature and indoor air humidity and the determination value are stored in advance and set based on the relational expression. Etc.

このように、判定値として吹出空気温度を用いる場合の結露回避制御は、図3と同様に、制御装置40は、冷房運転中、各室内機2のそれぞれの温湿度センサー24からの室内の温湿度を検知する(S1、S2)。また、吹出空気温度センサー27からの吹出空気温度を検知する(S3A)。そして、室内の温湿度に基づいて上述のようにして各室内機2のそれぞれについて、その室内機2が設置された空調対象エリア31、32の室内環境に応じた判定値を設定する(S4A)。そして、各室内機2のそれぞれ毎に、吹出空気温度センサー27からの吹出空気温度が判定値以下であるか否かをチェックする。   As described above, in the case of using the blown air temperature as the determination value, the dew condensation avoidance control is performed in the same manner as in FIG. Humidity is detected (S1, S2). Further, the temperature of the blown air from the blown air temperature sensor 27 is detected (S3A). Then, for each of the indoor units 2 based on the indoor temperature and humidity, a determination value is set according to the indoor environment of the air-conditioning target areas 31 and 32 where the indoor unit 2 is installed (S4A). . Then, for each of the indoor units 2, it is checked whether or not the blown air temperature from the blown air temperature sensor 27 is equal to or less than a determination value.

制御装置40は、吹出空気温度が判定値以下となっている室内機2がないと判断した場合(S5A)、上述の「通常時圧縮機周波数制御」を行う(S6)。一方、制御装置40は、吹出空気温度が判定値以下となっている室内機2があると判断した場合(S5A)、結露回避制御を開始し、例えば図4に示すような結露回避制御中であることを示すアイコン50を各リモートコントローラー26に表示する。   When it is determined that there is no indoor unit 2 whose blown air temperature is equal to or lower than the determination value (S5A), the control device 40 performs the above-described “normal-time compressor frequency control” (S6). On the other hand, when it is determined that there is an indoor unit 2 in which the blown air temperature is equal to or lower than the determination value (S5A), the control device 40 starts the dew condensation avoidance control, for example, during dew condensation avoidance control as illustrated in FIG. An icon 50 indicating the presence is displayed on each remote controller 26.

結露回避制御では、吹出空気温度が判定値以下となっている室内機2の吹出空気温度が判定値を上回るように圧縮機周波数を制御する。すなわち、まず、その室内機2の圧縮機周波数を所定値だけ下げる(S7)。そして、制御装置40は、再度、室内の温湿度及び吹出空気温度を検知し(S1、S2、S3A)、判定値の設定処理(S4A)と、判定値による判定処理(S5A)と、圧縮機周波数を所定値だけ下げる処理(S7)を行う。このS1、S2、S3A、S4A、S5A及びS7の処理を、対象の吹出空気温度が判定値を上回るまで繰り返す。そして、対象の吹出空気温度が判定値を上回ると、「通常時圧縮機周波数制御」を行う(S6)。すなわち、設定温度と吹出空気温度センサー27で検知された室内空気温度との温度差ΔTに応じて圧縮機周波数を決定し、その圧縮機周波数で圧縮機11を運転させる。   In the dew condensation avoidance control, the compressor frequency is controlled so that the blown air temperature of the indoor unit 2 whose blown air temperature is equal to or lower than the determination value exceeds the determination value. That is, first, the compressor frequency of the indoor unit 2 is lowered by a predetermined value (S7). Then, the control device 40 again detects the indoor temperature and humidity and the blown air temperature (S1, S2, S3A), a determination value setting process (S4A), a determination process based on the determination value (S5A), and the compressor A process of lowering the frequency by a predetermined value (S7) is performed. The processes of S1, S2, S3A, S4A, S5A and S7 are repeated until the target blown air temperature exceeds the determination value. When the target blown air temperature exceeds the determination value, “normal compressor frequency control” is performed (S6). That is, the compressor frequency is determined according to the temperature difference ΔT between the set temperature and the indoor air temperature detected by the blown air temperature sensor 27, and the compressor 11 is operated at the compressor frequency.

このように、室内機2の運転状態温度として吹出空気温度を用いた場合も、室内熱交換器温度を用いた場合と同様の効果を得ることができる。   Thus, even when the blown air temperature is used as the operating state temperature of the indoor unit 2, the same effect as when the indoor heat exchanger temperature is used can be obtained.

(8)図1の空気調和機100の構成では各室内機2の全てに温湿度センサー24が備えられているが、仮に室内機2Bに温湿度センサー24が備えられていない場合、同空調対象エリア31に設置された室内機2Aの検知した室内温湿度を使用して判定値を設定するようにしてもよい。   (8) In the configuration of the air conditioner 100 of FIG. 1, all the indoor units 2 are provided with the temperature / humidity sensor 24. However, if the indoor unit 2B is not provided with the temperature / humidity sensor 24, the air conditioning target The determination value may be set using the indoor temperature and humidity detected by the indoor unit 2 </ b> A installed in the area 31.

(9)図1の空気調和機の構成では室内機2A,2Bが空調対象エリア31に備えられ、室内機2Cが空調対象エリア32に備えられているが、室内機2A,2B,2Cがそれぞれ別室に据え付けられている場合について考える。各室内機2に流れる冷媒の圧力及び温度は、各室内機2の冷媒循環量や、冷媒配管長によって差異が生じるものであり、各々の室内熱交換器温度に差が存在し、室内の温湿度が大きく異なることもある。   (9) In the configuration of the air conditioner of FIG. 1, the indoor units 2A and 2B are provided in the air conditioning target area 31, and the indoor unit 2C is provided in the air conditioning target area 32, but the indoor units 2A, 2B, and 2C are respectively provided. Consider the case where it is installed in a separate room. The pressure and temperature of the refrigerant flowing through each indoor unit 2 vary depending on the refrigerant circulation amount of each indoor unit 2 and the refrigerant pipe length, and there is a difference in the temperature of each indoor heat exchanger. Humidity can vary greatly.

そのため、例えば室内機2Aでの結露を回避するために圧縮機周波数を制限しているときに、室内機2Aの設置されている空調対象エリア31では冷房能力に問題が無くても、室内機2Cが設置されている空調対象エリア32では冷房能力不足に陥ってしまう可能性がある。このとき、リモートコントローラー26の表示画面にて、室内機2Aが結露回避のために圧縮機周波数を抑制する要因となっていることを確認できるようにする。以下、具体例を説明する。   Therefore, for example, when the compressor frequency is limited to avoid condensation in the indoor unit 2A, the indoor unit 2C can be used even if there is no problem in the cooling capacity in the air-conditioning target area 31 in which the indoor unit 2A is installed. There is a possibility that the air conditioning target area 32 in which the air conditioner is installed will fall into a cooling capacity shortage. At this time, it is possible to confirm on the display screen of the remote controller 26 that the indoor unit 2A is a factor that suppresses the compressor frequency in order to avoid condensation. Specific examples will be described below.

図8は、結露回避のために圧縮機周波数を抑制する要因となっている室内機を確認する際のリモートコントローラー画面の一例を示す図である。
ここでは、リモートコントローラー26上の操作ボタン群51の何れかを操作し、サービスメニューを表示させる。そして、「結露回避制御ユニット確認」を選択することで、結露回避のために圧縮機周波数を抑制する要因となっている室内機2が室内機2A(アドレス01)であることが確認できるようになっている。なお、この表示例は一例であって、この表示例に限られたものではない。
FIG. 8 is a diagram illustrating an example of a remote controller screen when confirming an indoor unit that is a factor for suppressing the compressor frequency to avoid condensation.
Here, any one of the operation buttons 51 on the remote controller 26 is operated to display the service menu. Then, by selecting “condensation avoidance control unit confirmation”, it is possible to confirm that the indoor unit 2 that is a factor for suppressing the compressor frequency to avoid condensation is the indoor unit 2A (address 01). It has become. In addition, this display example is an example, Comprising: It is not restricted to this display example.

このように、結露回避のために圧縮機周波数を抑制する要因となっている室内機2が室内機2Aであることを確認できるようにしておくことで、例えば室内機2Cが設置された空調対象エリア32のユーザーがスムーズに要因を認識できて、問題解決に取り組めるようになる。なお、ここでは、室内機2A,2Bと室内機2Cとが別の空調対象エリアに配置されている場合を例に説明したが、図8の表示は、この場合に限られない。例えば、一つの空調対象エリア内に温湿度分布があるような状況も考えられるため、同じ空調対象エリアに室内機2A,2B,2Cを配置する場合であっても、上記の圧縮機周波数抑制要因の室内機を特定する表示は有効である。   Thus, by making it possible to confirm that the indoor unit 2 that is the factor that suppresses the compressor frequency in order to avoid condensation is the indoor unit 2A, for example, the air conditioning target in which the indoor unit 2C is installed The user in the area 32 can recognize the factors smoothly and can work on solving the problem. Here, the case where the indoor units 2A and 2B and the indoor unit 2C are arranged in different air conditioning target areas has been described as an example, but the display in FIG. 8 is not limited to this case. For example, since there may be a situation where there is a temperature / humidity distribution in one air-conditioning target area, even if the indoor units 2A, 2B, 2C are arranged in the same air-conditioning target area, the above-described compressor frequency suppression factor The display for identifying the indoor unit is effective.

(10)図9は、この発明の一実施の形態に係る空気調和機に他の空気調和機が接続された空気調和システムの構成を示す図である。
上記では、空気調和機100単体の構成について説明したが、図9に示すように、空気調和機100に、他の空気調和機200を通信網300を介して接続して空気調和システムを構成してもよい。
(10) FIG. 9 is a diagram showing a configuration of an air conditioning system in which another air conditioner is connected to the air conditioner according to the embodiment of the present invention.
In the above, the configuration of the air conditioner 100 alone has been described. However, as shown in FIG. 9, another air conditioner 200 is connected to the air conditioner 100 via the communication network 300 to configure an air conditioner system. May be.

また、図9には、空気調和機200の室内機201は空気調和機100の室内機2Cと同様に空調対象エリア32に配置されている。そして空気調和機200の室外機202と空気調和機100の室外機1とは、空気調和システムの集中管理や協調制御のため、通信網300で接続されている。空気調和機200は、結露回避制御に対応したプログラムを備えていてもよいし、備えていなくてもよい。また、ここでは空気調和システムが2台の空気調和機を備えた構成としたが、更に複数台の空気調和機を備えた構成としてもよい。   In FIG. 9, the indoor unit 201 of the air conditioner 200 is arranged in the air conditioning target area 32 in the same manner as the indoor unit 2 </ b> C of the air conditioner 100. The outdoor unit 202 of the air conditioner 200 and the outdoor unit 1 of the air conditioner 100 are connected by a communication network 300 for centralized management and cooperative control of the air conditioning system. The air conditioner 200 may or may not include a program corresponding to dew condensation avoidance control. In addition, here, the air conditioning system is configured to include two air conditioners, but may be configured to include a plurality of air conditioners.

このように構成された空気調和システムにおいて、例えば室内機2Cに温湿度センサー24が備えられていない場合、室内機2Cに対応する判定値を以下のように決定してもよい。すなわち、空気調和機100の制御装置40は、室内機2Cと同一の空調対象エリア32に配置された空気調和機200の室内機201の温湿度センサー24Dが検知した温湿度を、通信網300を介して取得し、室内機2Cに対応する判定値を決定するようにしてもよい。   In the air conditioning system configured as described above, for example, when the temperature and humidity sensor 24 is not provided in the indoor unit 2C, a determination value corresponding to the indoor unit 2C may be determined as follows. That is, the control device 40 of the air conditioner 100 uses the communication network 300 to detect the temperature and humidity detected by the temperature and humidity sensor 24D of the indoor unit 201 of the air conditioner 200 arranged in the same air conditioning target area 32 as the indoor unit 2C. The determination value corresponding to the indoor unit 2C may be determined.

1 室外機、2(2A,2B,2C) 室内機、10 室外送風機、11 圧縮機、12 四方切換弁、13 室外熱交換器、14 電子膨張弁、15 アキュームレーター、21(21A,21B,21C) 室内熱交換器、22(22A,22B,22C) 室内送風機、23(23A,23B,23C) 電子膨張弁、24(24A,24B,24C) 温湿度センサー、24D 温湿度センサー、25(25A,25B,25C) 液管温度センサー、26(26A,26B,26C) リモートコントローラー、27(27A,27B,27C) 吹出空気温度センサー、31 空調対象エリア、32 空調対象エリア、40 制御装置、50 アイコン、51 操作ボタン群、100 空気調和機(第1空気調和機)、200 空気調和機(第2空気調和機)、201 室内機、202 室外機、300 通信網。   1 outdoor unit, 2 (2A, 2B, 2C) indoor unit, 10 outdoor blower, 11 compressor, 12 four-way switching valve, 13 outdoor heat exchanger, 14 electronic expansion valve, 15 accumulator, 21 (21A, 21B, 21C ) Indoor heat exchanger, 22 (22A, 22B, 22C) Indoor blower, 23 (23A, 23B, 23C) Electronic expansion valve, 24 (24A, 24B, 24C) Temperature / humidity sensor, 24D Temperature / humidity sensor, 25 (25A, 25B, 25C) Liquid pipe temperature sensor, 26 (26A, 26B, 26C) Remote controller, 27 (27A, 27B, 27C) Blowing air temperature sensor, 31 Air conditioning target area, 32 Air conditioning target area, 40 Control device, 50 icon, 51 operation button group, 100 air conditioner (first air conditioner), 200 air conditioner (second Air conditioner), 201 indoor unit, 202 outdoor unit, 300 communication network.

Claims (16)

容量可変型の圧縮機を有する室外機と、
室内熱交換器を有する室内機と、
前記室内機の運転状態温度を検知する運転状態温度検知手段と、
室内空気の温湿度を検知する室内温湿度検知手段と、
冷房運転時において前記室内機に結露が発生すると予測される場合に前記室内機の結露を回避する結露回避制御を行う制御装置とを備え、
前記制御装置は、冷房運転時に、前記室内温湿度検知手段により検知された室内空気の温湿度に基づいて前記室内機に結露が発生するか否かを判定するための判定値を設定し、前記運転状態温度検知手段で検知された前記室内機の運転状態温度が前記判定値以下の場合、前記室内機の運転状態温度が前記判定値を上回るように圧縮機周波数を制御する前記結露回避制御を行う
ことを特徴とする空気調和機。
An outdoor unit having a variable capacity compressor;
An indoor unit having an indoor heat exchanger;
An operation state temperature detecting means for detecting an operation state temperature of the indoor unit;
Indoor temperature and humidity detection means for detecting the temperature and humidity of the indoor air;
A controller for performing condensation avoidance control for avoiding condensation of the indoor unit when it is predicted that condensation occurs in the indoor unit during cooling operation;
The control device sets a determination value for determining whether or not condensation occurs in the indoor unit based on the temperature and humidity of the indoor air detected by the indoor temperature and humidity detection means during the cooling operation, When the operation state temperature of the indoor unit detected by the operation state temperature detecting means is equal to or lower than the determination value, the dew condensation avoidance control for controlling the compressor frequency so that the operation state temperature of the indoor unit exceeds the determination value. An air conditioner characterized by performing.
前記判定値は、室内空気温度が低いほど、また、室内空気湿度が低いほど、低い値となる
ことを特徴とする請求項1記載の空気調和機。
2. The air conditioner according to claim 1, wherein the determination value becomes lower as the indoor air temperature is lower and the indoor air humidity is lower.
前記結露回避制御は、前記圧縮機周波数を予め設定した所定値だけ下げ、その後、再度、前記判定値を設定し直して前記室内機の運転状態温度が前記判定値以下かどうかを判断する処理を繰り返し行うことで、前記室内機の運転状態温度が前記判定値を上回るようにする制御である
ことを特徴とする請求項1又は請求項2記載の空気調和機。
The dew condensation avoidance control is a process of reducing the compressor frequency by a predetermined value set in advance, and then setting the determination value again to determine whether the operating state temperature of the indoor unit is equal to or lower than the determination value. 3. The air conditioner according to claim 1, wherein the air conditioner is controlled such that the operation state temperature of the indoor unit exceeds the determination value by being repeatedly performed.
前記結露回避制御は、圧縮機周波数範囲の上限値を制限することで、前記室内機の運転状態温度が前記判定値を上回るようにする制御である
ことを特徴とする請求項1又は請求項2記載の空気調和機。
3. The dew condensation avoiding control is a control that limits an upper limit value of a compressor frequency range so that an operating state temperature of the indoor unit exceeds the determination value. The air conditioner described.
前記結露回避制御中において、室内空気温度と設定温度との温度差が所定値より大きい場合、前記室内機の室内送風機の送風量を増加させる
ことを特徴とする請求項1〜請求項4の何れか一項に記載の空気調和機。
5. The air flow rate of the indoor fan of the indoor unit is increased when the temperature difference between the indoor air temperature and the set temperature is larger than a predetermined value during the dew condensation avoidance control. An air conditioner according to claim 1.
前記制御装置は、前記運転状態温度検知手段で検知された前記室内機の運転状態温度が前記判定値以下となる状態が一定時間以上継続しない限り、前記結露回避制御を行わない
ことを特徴とする請求項1〜請求項5の何れか一項に記載の空気調和機。
The control device does not perform the dew condensation avoidance control unless a state where the operation state temperature of the indoor unit detected by the operation state temperature detection unit is equal to or lower than the determination value does not continue for a predetermined time or longer. The air conditioner as described in any one of Claims 1-5.
前記制御装置は、前記結露回避制御の有効、無効を設定する設定手段を有し、
前記設定手段の設定をユーザー操作に従って切り換えられるようにした
ことを特徴とする請求項1〜請求項6の何れか一項に記載の空気調和機。
The control device has setting means for setting validity and invalidity of the dew condensation avoidance control,
The air conditioner according to any one of claims 1 to 6, wherein setting of the setting means can be switched according to a user operation.
前記制御装置は、ユーザー操作に従って前記判定値を下げる圧縮機周波数制限緩和手段を有する
ことを特徴とする請求項1〜請求項7の何れか一項に記載の空気調和機。
The air conditioner according to any one of claims 1 to 7, wherein the control device includes a compressor frequency limit mitigation unit that lowers the determination value in accordance with a user operation.
前記室内機の運転状態温度は、前記室内熱交換器の温度である
ことを特徴とする請求項1〜請求項8の何れか一項に記載の空気調和機。
The air conditioner according to any one of claims 1 to 8, wherein an operating state temperature of the indoor unit is a temperature of the indoor heat exchanger.
前記制御装置は、前記室内機の室内送風機の風量に応じて前記判定値を補正する補正手段を備え、
前記補正手段は、前記室内送風機の風量が大きいほど、低くなるように前記判定値を補正する
ことを特徴とする請求項9記載の空気調和機。
The control device includes a correction unit that corrects the determination value according to an air volume of an indoor fan of the indoor unit,
The air conditioner according to claim 9, wherein the correction unit corrects the determination value so as to decrease as the air volume of the indoor fan increases.
前記室内機の運転状態温度は、前記室内機の吹出温度である
ことを特徴とする請求項1〜請求項8の何れか一項に記載の空気調和機。
The air conditioner according to any one of claims 1 to 8, wherein the operating state temperature of the indoor unit is a blowing temperature of the indoor unit.
複数の前記室内機を備え、
前記制御装置は、前記各室内機の前記室内温湿度検知手段により検知された各室内の温湿度に基づいて、前記各室内機毎に、それぞれ対応の前記判定値を設定し、前記各判定値に基づいて、前記各室内機毎に、それぞれ前記運転状態温度検知手段で検知された前記室内機の運転状態温度が、対応の前記判定値以下かどうかを判断し、前記室内機の運転状態温度が、対応の前記判定値以下となっている室内機がある場合、その室内機の前記運転状態温度検知手段で検知された前記室内機の運転状態温度が、対応の前記判定値を上回るように前記圧縮機周波数を制御する前記結露回避制御を行う
ことを特徴とする請求項1〜請求項11の何れか一項に記載の空気調和機。
Comprising a plurality of the indoor units,
The control device sets the determination value corresponding to each indoor unit based on the temperature and humidity in each room detected by the indoor temperature and humidity detection means of each indoor unit, and each determination value Based on the above, for each of the indoor units, it is determined whether the operation state temperature of the indoor unit detected by the operation state temperature detection means is equal to or less than the corresponding determination value, and the operation state temperature of the indoor unit However, when there is an indoor unit that is equal to or lower than the corresponding determination value, the operation state temperature of the indoor unit detected by the operation state temperature detection unit of the indoor unit exceeds the corresponding determination value. The air conditioner according to any one of claims 1 to 11, wherein the dew condensation avoidance control for controlling the compressor frequency is performed.
複数の前記室内機を備え、
前記複数の室内機の一部には各室内機毎に前記室内温湿度検知手段が備えられ、前記複数の室内機の残りには前記室内温湿度検知手段が設けられていない構成を有し、
前記制御装置は、
前記室内温湿度検知手段が設けられていない前記室内機に対応する前記判定値を設定するにあたっては、前記室内温湿度検知手段が設けられていない前記室内機と同室に設置された前記室内温湿度検知手段で検知された室内空気の湿度を用いる
ことを特徴とする請求項1〜請求項11の何れか一項に記載の空気調和機。
Comprising a plurality of the indoor units,
A part of the plurality of indoor units is provided with the indoor temperature / humidity detecting means for each indoor unit, and the rest of the plurality of indoor units has a configuration in which the indoor temperature / humidity detecting means is not provided,
The controller is
In setting the determination value corresponding to the indoor unit in which the indoor temperature / humidity detection unit is not provided, the indoor temperature / humidity installed in the same room as the indoor unit in which the indoor temperature / humidity detection unit is not provided. The air conditioner according to any one of claims 1 to 11, wherein the humidity of the indoor air detected by the detecting means is used.
前記室内機を操作するリモートコントローラーを更に備え、
前記制御装置は、前記複数の室内機のうち、対応の判定値以下の運転状態温度を有して前記結露回避制御を行う要因となった室内機を特定する情報を、前記リモートコントローラーに表示する
ことを特徴とする請求項12又は請求項13記載の空気調和機。
A remote controller for operating the indoor unit;
The control device displays, on the remote controller, information identifying an indoor unit that has an operation state temperature equal to or lower than a corresponding determination value and has become a factor for performing the condensation avoidance control among the plurality of indoor units. The air conditioner according to claim 12 or claim 13, wherein
請求項1〜請求項11の何れか一項に記載の空気調和機(以下、第1空気調和機という)と、前記第1空気調和機に通信網で接続された空気調和機(以下、第2空気調和機という)とを備えた
ことを特徴とする空気調和システム。
The air conditioner according to any one of claims 1 to 11 (hereinafter referred to as a first air conditioner) and an air conditioner (hereinafter referred to as a first air conditioner) connected to the first air conditioner via a communication network. 2 air conditioner).
前記第2空気調和機は室内機を1又は複数備えており、前記第1空気調和機及び前記第2空気調和機のそれぞれの少なくとも一部の前記室内機が同室に配置された構成を有し、
同室に設置された複数の前記室内機のうち、前記第1空気調和機の前記室内機には前記室内温湿度検知手段が設けられ、前記第2空気調和機の前記室内機の残りには前記室内温湿度検知手段が設けられていない構成を有し、
前記制御装置は、
前記室内温湿度検知手段が設けられていない前記室内機に対応する前記判定値を設定するにあたっては、前記室内温湿度検知手段が設けられていない前記室内機と同室に設置された、前記第2空気調和機の前記室内機に設けられた前記室内温湿度検知手段で検知された室内空気の湿度を、前記通信網を介して取得して用いる
ことを特徴とする請求項15記載の空気調和システム。
The second air conditioner includes one or more indoor units, and at least some of the indoor units of the first air conditioner and the second air conditioner are arranged in the same room. ,
Among the plurality of indoor units installed in the same room, the indoor unit of the first air conditioner is provided with the indoor temperature / humidity detecting means, and the rest of the indoor units of the second air conditioner It has a configuration in which indoor temperature and humidity detection means are not provided,
The controller is
In setting the determination value corresponding to the indoor unit in which the indoor temperature / humidity detection unit is not provided, the second value is installed in the same room as the indoor unit in which the indoor temperature / humidity detection unit is not provided. 16. The air conditioning system according to claim 15, wherein the indoor air humidity detected by the indoor temperature / humidity detecting means provided in the indoor unit of the air conditioner is acquired and used via the communication network. .
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