Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Tomohiko Kasai

Hidekazu Tani

Yoshihiro Sumida

Osamu Morimoto

Takashi Okazaki

Takashi Nakamura

Shigeo Takata

Junichi Kameyama

Noriaki Hayashida

Daisuke Shimamoto

Shogo Tamaki

Keisuke Hokazono

Moriya Miyamoto

Yoshio Ueno

Koji Yamashita

Yuji Motomura

Hiroyuki Morimoto

Takashi Ikeda

Shinichi Wakamoto

Naoki Tanaka

Takeshi Hatomura

Fumitake Unezaki

Hitoshi Iijima

Hirofumi Koge

Kazuyoshi Shinozaki

Masahiro Tsuda

Makoto Saitou

Munehiro Yamanaka

Mitsunori Kurachi

Fujio Hitomi

Tatsuo Ono

Shuji Oura

Kosuke Tanaka

Naofumi Takenaka

Kenji Kawaguchi

Yusuke Shimazu

Joseph Paul Bush

Hiroki Murakami

Masaharu Moriyasu

Michio Fujiwara

Fumio Matsuoka

Youichi Hisamori

Toshihiro Kikukawa

Hirofumi Kouge

Masahiko Sugino

Shohichiroh Masuda

An air-conditioning apparatus has different two modes including a response detection diagnosis in which a control unit diagnoses a trouble of a component device during the trouble diagnosis operation based on presence or absence of a response from the operational state sensor when the mode has forcibly changed the device operation, and a performance detection diagnosis in which a trouble is detected by a detection value of the operational state sensor at a time when the operational state of the trouble diagnosis operation is stable, and the performance detection diagnosis is executed after the response detection diagnosis is executed.

Air conditioning apparatus

A correspondence determination operation is performed. The correspondence determination operation differs a direction of distribution or a flow rate of a refrigerant flowing in one or some of use units among a plurality of use units to that of the other use units and determines, on the basis of a refrigerant temperature of the use unit, a location of a non-correspondence between a branch port that is connected to the use unit with refrigerant pipes and a set branch port that is obtained in accordance with the wire connection.

Multi air-conditioning apparatus

An air-conditioning apparatus includes a body casing of an indoor unit formed in a substantially rectangular parallelepiped shape. The body casing is formed with a body inlet port on a body bottom, and a body outlet port is formed in each body side. The body casing houses a centrifugal fan, a fan motor rotatably driving the centrifugal fan, and an indoor heat exchanger disposed so as to surround an outer periphery of the centrifugal fan in planar view. In each of the body outlet port, a joint is protrudingly provided with a body-side duct connecting portion that connects a duct thereto. Further, outlet ports are formed. The air-conditioning apparatus includes a plurality of outlet units each protrudingly provided with an outlet-side duct connecting portion that connects the duct thereto. Furthermore, at least one of the joints is formed with a plurality of the body-side duct connecting portions.

Air-conditioning apparatus and configuration of installation of same

An air-conditioning apparatus including a check valve in a passage between a first flow switching device and a suction side of a compressor, an expansion valve midway of a liquid extension piping, and an additional unit having a first bypass and a second bypass that are branched off from a passage between an indoor unit and the liquid expansion valve, and are connected to a passage between the check valve and the suction side of the compressor. The first bypass has, midway thereof, a first bypass expansion valve capable of controlling a throughput of refrigerant and an auxiliary heat exchanger that has a heat source different from the refrigerant, the auxiliary heat exchanger functioning as an evaporator heating the refrigerant flowing in the first bypass. The second bypass has, midway thereof, a second bypass expansion valve capable of controlling a throughput of refrigerant.

Air-conditioning apparatus including unit for increasing heating capacity

A multi-chamber air conditioner including a heat-source side refrigerant circuit in which a compressor, an outdoor heat exchanger, a first heat exchanger, a refrigerant flow-rate controller, and a second heat exchanger are connected in series, a first use-side refrigerant circuit in which the first heat exchanger and an indoor heat exchanger are connected in series, and a second use-side refrigerant circuit in which the second heat exchanger and the indoor heat exchanger are connected in series, and a heat-source side refrigerant circulating in the heat-source side refrigerant circuit and a use-side refrigerant circulating in the use-side refrigerant circuit are heat-exchanged in the first heat exchanger. The heat-source side refrigerant circulating in the heat-source side refrigerant circuit and the use-side refrigerant circulating in the use-side refrigerant circuit are heat-exchanged in the second heat exchanger.

Air conditioner

Operation data of a refrigerant circuit is acquired after an initial refrigerant charge amount of refrigerant is charged in the refrigerant circuit and operation of the refrigerant circuit is started, an internal volume of a high-pressure pipeis computed from the obtained operation data and the initial refrigerant charge amount input in a input unit, a target refrigerant charge amount is computed from the computed internal volume of the high-pressure pipeand a standard operating state acquired in advance, the standard operating state being operation data of the refrigerant circuit when the refrigerant circuit is in a standard operating state that satisfies a preset condition, and an additional refrigerant charge amount is computed from the target refrigerant charge amount and the initial refrigerant charge amount.

Refrigerant charge assisting device, air-conditioning apparatus, and refrigerant charge assisting program

A heat source-side refrigerant circuit A including a compressor, an outdoor heat exchanger, a first refrigerant branch portionconnected to the compressor, a second refrigerant branch portionand a third refrigerant branch portionconnected to the outdoor heat exchanger, a first refrigerant flow rate control deviceprovided between branch pipingand the second refrigerant branch portion, intermediate heat exchangersconnected at one side thereof to the first refrigerant branch portionand the third refrigerant branch portionvia three-way valvesand connected at the other side thereof to the second refrigerant branch portion, and second refrigerant flow rate control devicesprovided between the respective intermediate heat exchangersand the second refrigerant branch portion, and user-side refrigerant circuits Bn having indoor heat exchangersconnected respectively to the intermediate heat exchangersare provided, and at least one of water and an antifreeze solution circulates in the user-side refrigerant circuits Bn.

A heat pump system has a single heat source unit connected to at least one load unit to heat water to a high temperature. A hot water supply system(heat pump system) includes a heat source unitprovided with a first compressor, a four-way selector valveand a heat source heat exchanger, and a load unitprovided with a first flow controller, a first load heat exchanger, a second compressor, a second load heat exchanger, and a second flow controller. A main circuit A is formed by connecting the first compressor, the four-way selector valve, the heat source heat exchanger, the first flow controllerand the first load heat exchangerwith a liquid pipeand a gas pipesequentially. A load refrigerant circuit B is formed by connecting the second compressor, the second load heat exchanger, the second flow controller, and the first load heat exchangerwith a load refrigerant pipe linesequentially.

Heat pump system

An air conditioning apparatus has plural indoor units having: plural heat exchangers; and flow controllers respectively corresponding to the heat exchangers. In each of the indoor units, one heat exchanger is used as a condenser, and another heat exchanger is used as an evaporator, thereby causing the indoor unit to perform a temperature and humidity controlling operation. An indoor unit(s) which is not set to perform the temperature and humidity controlling operation may be caused to perform a heating operation or a cooling operation. Capacity controls on the condensers and the evaporators are performed by corresponding flow controllers. Gas refrigerants ejected from plural heat exchangers serving as evaporators are joined together, and then distributed to plural heat exchangers serving as condensers.

An oil separator including a shell ( ) with a cylindrical section and a taper section which narrows in a downward direction and which is formed as an integral part at the bottom of the cylindrical section, an outlet pipe ( ) which is inserted through the top of the shell so that the central axis of the outlet pipe coincides with the central axis of the shell, a discharge pipe ( ) connected to an opening provided at the bottom of the taper section, and an inlet pipe ( ) connected tangentially to the inner surface of the cylindrical section for introducing a gas liquid two phase flow into the shell, wherein the distance between the shell opening ( ) and the tip ( ) of the outlet pipe inside the shell is at least 5 times the inside diameter of the inlet pipe ( ).

Oil separator and outdoor unit with the oil separator

A heat source unit and refrigerant used in an existing refrigeration system are replaced with new refrigerant and a new heat source unit which employs the new refrigerant and is equipped with an oil separator and extraneous-matter trapping device. An indoor unit of the existing refrigeration system may be used, in its present form, or replaced with a new indoor unit. Further, connecting pipes used for the existing refrigeration are reused. After replacement of refrigerant, the refrigeration system performs an ordinary operation after having performed a cleaning operation. The extraneous-matter trapping device is provided in a refrigerant pipe close to the heat source unit or in a bypass channel connected to the refrigerant pipe close to the heat source unit. Alternatively, only the heat source unit of the existing refrigeration system is replaced with a new one, and there is employed refrigeration oil which has no mutual solubility with respect to HFC or has very low mutual solubility.

Refrigeration system, and method of updating and operating the same

In the detection of circulating compositions in the cycle of a non-azeotropic refrigerant composed of three or more kinds of refrigerants, there have been drawbacks in that the number of sensors required is large, and large errors are contained in the circulating composition which can be detected. To overcome these drawbacks, the refrigerating and air-conditioning apparatus comprises at least a compressor, a condenser, a pressure reducing device, and an evaporator, and in a refrigerant cycle which uses as a working refrigerant a non-azeotropic refrigerant composed of N kinds (N&gE;3) of refrigerants and is provided with composition detecting means for detecting the circulating compositions of the non-azeotropic refrigerant, circulating compositions are determined by using (N&minus;2) relations on compositions among a first component to a j-th (2&lE;j&lE;N&minus;1) component of the non-azeotropic refrigerant.

Refrigerating and air-conditioning apparatus and method of determining refrigerant composition of refrigerating and air-conditioning apparatus

A refrigeration cycle device having a first refrigeration circuit for circulating a refrigerant from a compressor through a heat exchanger on a heat source equipment side, a flow rate adjuster, a heat exchanger on an application side, and an accumulator in a sequential manner to the compressor, comprising an extraneous matter catching means for catching extraneous matters in the refrigerant provided between the heat exchanger on application side and the accumulator of the first refrigeration circuit, and an oil separating means for separating a refrigerating machine oil in the refrigerant to separate the extraneous matters and the refrigerating machine oil from the refrigerant, by such a structure only a heat source equipment A and an indoor unit B can be newly exchanged without exchanging connection pipes C and D for connecting the heat source equipment and the indoor unit after flushing operation for introducing a new refrigerant.

Refrigeration cycle device, a method of producing the device, and a method of operating the device

In a refrigerating apparatus using a non-azeotropic refrigerant, the composition is included among the quantities of state of a refrigerant, so that it is difficult to detect the state of the interior of the refrigerant circuit. For this reason, it is difficult to stabilize the operation of the refrigerating apparatus by detecting the state of the interior of the refrigerating apparatus, and avoid the malfunction of the refrigerating apparatus. The cyclic composition of the refrigerating apparatus is detected, and the state of the interior of the refrigerating apparatus is detected accurately by using this cyclic composition. In addition, the refrigerating apparatus is arranged such that in a case where there is a quantity of state which cannot be detected accurately owing to an error or the like of the detected cyclic composition, that value can be detected directly. As a result, it is possible to accurately detect the malfunction of the refrigerating apparatus and avoid this state.

Refrigerating apparatus

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Cypress, CA, United States of America

Tomohiko Kasai