Daikin Industries, Ltd.

Shinichi Kasahara

Manabu Yoshimi

Tadafumi Nishimura

Takahiro Yamaguchi

Shuji Fujimoto

Toshiyuki Kurihara

Takeshi Hikawa

Akihiro Inao

Shizuka Sadai

Kousuke Kibo

Tetsuya Okamoto

Shohei Yamada

Makoto Kojima

Atsushi Yoshimi

Toshiyuki Maeda

Masahiro Oka

Yoshio Ueno

Shuuji Fujimoto

Yasuyuki Aisaka

Masanobu Kita

Kazuhiko Tani

Shingo Ohnishi

Yoshinori Yura

Kiyoshi Koizumi

Shigenobu Izumi

Hiroyuki Kagitani

Hidetaka Kishimoto

Providing a refrigerant circuit apparatus evaluation system, which, when a plurality of refrigerant circuit apparatuses is installed, may accurately determine whether a heat source unit of each refrigerant circuit apparatus adversely affects the operation of a different refrigerant circuit apparatus. A refrigerant circuit apparatus evaluation system includes memory and processing circuitry. The processing circuitry acquires operation data on a first air-conditioning apparatus. The first air-conditioning apparatus includes a first heat source unit. The processing circuitry determines whether an operation of a second heat source unit different from the first heat source unit has an adverse effect on an operation of the first heat source unit based on the operation data on the first air-conditioning apparatus acquired by the processing circuitry when the first air-conditioning apparatus and a second air-conditioning apparatus including the second heat source unit are simultaneously operating.

Refrigerant circuit apparatus evaluation system

An air conditioning apparatus includes a refrigerant circuit in which a plurality of indoor units respectively including an indoor heat exchanger and an indoor expansion valve are connected to an outdoor unit including an outdoor expansion valve via a liquid-refrigerant connection pipe. The air conditioning apparatus individually controls each of the indoor units to operate or stop. The air conditioning apparatus includes a controller. When at least one of the indoor heat exchangers functions as a radiator, the controller controls an opening degree of the indoor expansion valve and an opening degree of the outdoor expansion valve. The apparatus—determines whether a refrigerant amount in the refrigerant circuit is appropriate on the basis of an amount of change corresponding to a change in state of a refrigerant between the indoor expansion valve and the outdoor expansion valve.

Air conditioning apparatus, management device, and connection pipe

A refrigerant amount determining device includes: an operation data acquiring unit configured to acquire operation data of an air conditioning system; a calculating unit configured to calculate a refrigerant amount index value from the operation data acquired; an inferring unit configured to infer information regarding correction of the refrigerant amount index value using a correction model and at least one of the acquired operation data or the calculated refrigerant amount index value; and a determining unit configured to determine a refrigerant amount of the air conditioning system based on the information regarding correction of the refrigerant amount index value.

Apparatus, method, and program for estimating amount of refrigerant

An air conditioning system includes an air conditioning apparatus, and a controller. The air conditioning apparatus performs air conditioning of an air-conditioning target space. The controller is connectable to a plurality of types of thermostats. The controller performs communication with the thermostat connected thereto. The controller performs a performance determination process for the refrigeration cycle apparatus. The controller performs different performance determination processes according to whether a first type of thermostat is connected thereto unit or whether a second type of thermostat is connected thereto. Alternatively, the air conditioning apparatus changes a method for using information received by the controller from the thermostat according to whether being in a determination processing time over which the performance determination process is performed or in a non-determination processing time over which the performance determination process is not performed.

Air conditioning system

A performance degradation diagnosis system includes a determining unit, and control unit. A refrigeration cycle apparatus includes a refrigerant circuit having a compressor, heat-source-side heat exchanger, and use-side heat exchanger. The determining unit determines, based on an index indicating an operation state of the refrigeration cycle apparatus, performance degradation of the refrigeration cycle apparatus with respect to each of a plurality of performance degradation factors. In a case in which the determining unit determines performance degradation, the control unit grasps an operation condition of the refrigeration cycle apparatus which is operating. In a case in which the operation condition of the refrigeration cycle apparatus is not suitable to determine performance degradation with respect to a performance degradation factor of a determination target, the control unit controls the operation condition of the refrigeration cycle apparatus so that the operation condition of the refrigeration cycle apparatus becomes an appropriate operation condition.

Performance degradation diagnosis system for refrigeration cycle apparatus

An additional-filling-amount management system includes a mass correlation data obtaining unit, an additional-filling-amount determination unit, and a storage unit. The mass correlation data obtaining unit obtains mass correlation data correlating with a mass of a refrigerant container from which refrigerant is supplied to a refrigeration cycle apparatus that is additionally filled with refrigerant. The additional-filling-amount determination unit determines an additional filling amount based on the mass correlation data, the additional filling amount being an amount of refrigerant, from the refrigerant container, with which the refrigeration cycle apparatus has been additionally filled. The storage unit stores apparatus information regarding the refrigeration cycle apparatus for which additional filling with refrigerant is completed and the additional filling amount that is the amount of refrigerant with which the refrigeration cycle apparatus identified with the apparatus information has been filled, in association with each other.

Additional-filling-amount management system

A refrigerant-amount determination kit includes a sensor and a processor. The sensor is mounted at least temporarily on at least one of a portion of a refrigeration cycle apparatus and the periphery of the refrigeration cycle apparatus. The refrigeration cycle apparatus is an apparatus having a refrigerant circuit that includes a compressor, a condenser, and an evaporator. The processor determines the amount of a refrigerant in the refrigerant circuit based on a detection result detected by the sensor during operation of the refrigeration cycle apparatus.

Refrigerant-amount determination kit

An operation control apparatus of air-conditioning apparatus having an outdoor unit and an indoor unit includes a controller programmed to execute energy conservation control of the air conditioning apparatus. The controller includes at least one required temperature calculation part calculating a required evaporation temperature or a required condensation temperature based on either a current amount of heat exchanged in a usage-side heat exchanger of the indoor unit and a greater amount of heat exchanged in the usage-side heat exchanger than the current amount, or an operating state amount that yields the current amount of heat exchanged in the usage-side heat exchanger and an operating state amount that yields the greater amount of heat exchanged in the usage-side heat exchanger than the current amount.

Operation control apparatus of air-conditioning apparatus and air-conditioning apparatus comprising same

A refrigeration device includes a radiator, an evaporator, a compressor, a heater and a control device. The radiator causes a refrigerant to radiate heat. The evaporator causes the refrigerant to evaporate. The compressor compresses the refrigerant circulating between the radiator and the evaporator. The heater heats lubricating oil in the compressor. The control device controls the heater so that an oil temperature of the lubricating oil in the compressor reaches an oil temperature target value obtained by adding a predetermined temperature to saturation temperature of the refrigerant in the compressor.

Refrigeration device

An air conditioner includes a refrigerant circuit configured to interconnect a heat source unit and a utilization unit, a transmission line that exchanges a signal between the heat source unit and the utilization unit, an information obtaining section, an operation controlling section capable of performing a refrigerant quantity judging operation, a refrigerant quantity judging section, and a condition setting section. The information obtaining section obtains information on the utilization unit connected to the heat source unit via the transmission line. The refrigerant quantity judging section judges the adequacy of the refrigerant quantity in the refrigerant circuit by using the operation state quantity of constituent equipment or refrigerant flowing in the refrigerant circuit in the refrigerant quantity judging operation. The condition setting section sets a condition for the refrigerant quantity judging operation according to the information on the utilization unit obtained by the information obtaining section.

Air conditioner

An air conditioning apparatus includes a heat source unit, usage units, and a controller. The heat source unit has a compression mechanism, a heat-source-side heat exchanger operable at least as an evaporator, and a heat-source-side expansion valve. The usage units have usage-side heat exchangers operable at least as condensers, and usage-side expansion valves. The controller regulates the opening degree of the heat-source-side expansion valve based on the opening degrees of the usage-side expansion valves.

Air conditioning apparatus having heat-source-side expansion valve control

An air conditioner () includes a refrigerant circuit () including a plurality of indoor heat exchangers (). A controller () for controlling operation of the air conditioner () includes a change unit () configured to change a set temperature Tem to a value larger than a current value when the minimum target superheat degree SHsm of target superheat degrees SHs determined for the respective indoor heat exchangers () is higher than a predetermined value SHt.

Refrigeration system

An air conditioner () includes a refrigerant circuit () configured to perform a supercritical refrigeration cycle and including: an outdoor circuit () including a compressor (), an outdoor heat exchanger (), and an outdoor expansion valve (); and two indoor circuits () including indoor heat exchangers () and indoor expansion valves (). The air conditioner () further includes a controller () configured to control outlet refrigerant temperatures of the indoor heat exchangers (). The controller () includes a valve control part () configured to adjust the opening degrees of the indoor expansion valves () such that a deviation of the outlet refrigerant temperature of each of the indoor heat exchangers () from an average value of the outlet refrigerant temperatures of all the indoor heat exchangers () approaches a deviation of a target value which is a deviation, from the average value, of a target refrigerant temperature of the outlet refrigerant temperature of each of the indoor heat exchangers ().

In a multi-type air conditioner, the adequacy of the refrigerant quantity charged in the air conditioner can be accurately determined, even when the refrigerant quantity charged on site is inconsistent, or even when a reference value of the operation state quantity, which is used for determining the adequacy of the refrigerant quantity, fluctuates depending on the pipe length of the refrigerant communication pipe, combination of utilization units, and the difference in the installation height among each unit. In an air conditioner () including a refrigerant circuit () configured by the interconnection of a heat source unit () and utilization units () via refrigerant communication pipes (), a refrigerant quantity determining system determines the adequacy of the refrigerant quantity and includes a state quantity storing means and a refrigerant quantity determining means. The state quantity storing means stores the operation state quantity of constituent equipment or the refrigerant flowing in the refrigerant circuit () in which refrigerant is charged up to an initial refrigerant quantity by on-site refrigerant charging. The refrigerant quantity determining means compares the operation state quantity during test operation as a reference value with a current value of the operation state quantity, and thereby determines the adequacy of the refrigerant quantity.

Refrigerant quantity determining system of air conditioner

A refrigeration device includes a compression mechanism, a radiator, a first expansion mechanism, a liquid receiver, a second expansion mechanism, an evaporator, a pressure detector, a temperature detector, and a control unit. The pressure detector is provided between the refrigerant discharge side of the compression mechanism and the refrigerant inflow side of the first expansion mechanism. The temperature detector is provided between the exit side of the radiator and the refrigerant inflow side of the first expansion mechanism. The control unit controls the first expansion mechanism using the pressure detected by the pressure detector and the temperature detected by the temperature detector so that the refrigerant flowing out from the first expansion mechanism reaches a saturated state.

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Sakai, Japan

Shinichi Kasahara