Mitsubishi Electric Corporation

Shogo Tamaki

Makoto Saito

Fumitake Unezaki

Ryo Oya

Kazuyoshi Shinozaki

Tomohiko Kasai

Kosuke Tanaka

So Nomoto

Kazutaka Suzuki

Shinichi Ito

Mamoru Hamada

Takuya Ito

Hirofumi Koge

Kazuhiro Komatsu

Hirokazu Minamisako

Nobuaki Uehara

Hirokuni Shiba

Makoto Wada

Masato Yosomiya

Masanobu Baba

Haruo Nakano

Kojiro Motomura

Yuto Shibao

A multi-split type air-conditioning device includes an indoor hot water unit, an indoor air unit, and an outdoor unit to which the indoor hot water unit and the indoor air unit are connected. The outdoor unit includes an outdoor unit-control unit configured to control a refrigerant circuit and transmits control commands for the indoor hot water unit and the indoor air unit via transmission signal lines. The outdoor unit-control unit executes an indoor hot water unit-determination process of causing the refrigerant circuit to perform a heating operation, and determining the branch port to which the indoor hot water unit is connected and an indoor air unit-determination process of causing the refrigerant circuit to perform a cooling operation, and determining a connection relationship between the branch port to which the indoor air unit is connected and the indoor air unit.

Multi-split type air-conditioning device and connection determination method

A first air-supply port and a first air-exhaust port each disposed in a first zone and used to ventilate the first zone are provided. Further, a second air-supply port and a second air-exhaust port each disposed in a second zone and used to ventilate the second zone are provided, and the second zone is adjacent to the first zone. The first air-supply port, the first air-exhaust port, the second air-supply port, and the second air-exhaust port are disposed on one plane. The first air-supply port, the first air-exhaust port, the second air-supply port, and the second air-exhaust port are disposed in order of the first air-exhaust port, the first air-supply port, the second air-supply port, and the second air-exhaust port in one direction, or in order of the first air-supply port, the first air-exhaust port, the second air-exhaust port, and the second air-supply port in one direction.

Ventilation system, air-conditioning system, and method of installing air-conditioning system

When a heating operation mode using a heating unit is specified and when a hot water supply request using the hot water in a hot water storage tank does not occur, an air conditioning apparatus transmits a first selection signal for selecting the heating unit to a three-way valve. When the heating operation mode is specified and when the hot water supply request occurs, the air conditioning apparatus transmits, to the three-way valve, a second selection signal for changing a destination of circulation of secondary refrigerant from the heating unit to a coil heat exchanger, and transmits an operation start signal to a refrigerant indoor unit.

Air conditioning apparatus

A hot water supply system that can reduce energy consumption is provided. The hot water supply system includes a liquid heater for heating a liquid, a liquid-water heat exchanger, a water-heating circuit in which the liquid is circulated between the liquid heater and the liquid-water heat exchanger, a lower outward path for leading water from a lower part of a hot water storage tank to the liquid-water heat exchanger, the upper return path for leading the water from the liquid-water heat exchanger to an upper part of the hot water storage tank, a middle outward path for leading the water from a middle part of the hot water storage tank to the liquid-water heat exchanger, a middle return path for leading the water from the liquid-water heat exchanger to a middle part of the hot water storage tank.

Heating and hot water supply system

An air-conditioning apparatus includes; a first heat source device configured to transfer heat to process air using as a heat source a vapor-compression refrigeration cycle; a second heat source device configured to transfer heat to the process air using an other heat source different from the vapor-compression refrigeration cycle; and a controller configured to control the first heat source device and the second heat source device. The controller deactivates the first heat source device and activates the second heat source device when, during a period in which the first heat source device is being operated to heat the process air, a temperature of the heated process air is kept at a target temperature and a parameter indicating an energy consumption of the first heat source device exceeds a first threshold value.

Air-conditioning apparatus

An air-conditioning apparatus and an air-conditioning system including a first unit including a compressor and a first heat exchanger, and a plurality of second units that each include a second heat exchanger. Each of the plurality of second units connect to the first unit via a plurality of branched pipes and a plurality of valves. The air-conditioning apparatus and air-conditioning system also include a storage unit that stores connection information indicating a relationship of connection between the plurality of second units and the plurality of branched pipes, and a control unit that detects whether the connection information includes a closed path pipe.

Air-conditioning apparatus and air-conditioning system

A heat pump heating and hot-water system includes a water heating heat exchanger for heating water by heat exchange with a heating medium heated by a heat pump unit, an indoor heating unit, a heating circulation circuit for selectively pumping the heating medium to either of the water heating heat exchanger and the indoor heating unit using a heating medium pump, and a hot-water accumulating circuit that sends water in a hot-water storage tank to the water heating heat exchanger and returns water having passed through the water heating heat exchanger to the hot-water storage tank using a water pump. The volumetric flow rate of the heating medium pumped to the water heating heat exchanger by the heating medium pump is higher than or equal to the volumetric flow rate of the water pumped to the water heating heat exchanger by the water pump.

Heat pump heating and hot-water system

A refrigeration cycle apparatus includes: a refrigeration cycle circuit including a compressor, a four-way valve, a heat source side heat exchanger, a heat source side pressure-reducing mechanism, an indoor side pressure-reducing mechanism, and an indoor side heat exchanger, and a hot water supply refrigerant circuit branching off from between the compressor and the four-way valve, including a hot water supply side heat exchanger and a hot water supply side pressure-reducing mechanism in order, and connected between the heat source side pressure-reducing mechanism and the indoor side pressure-reducing mechanism, wherein when a refrigerant state value on at least one of a low pressure side of the refrigeration cycle circuit and a discharge side of the compressor becomes a refrigerant collection start state value, a refrigerant collecting operation that collects refrigerant accumulated in the hot water supply refrigerant circuit into the refrigeration cycle circuit is started.

Refrigeration cycle device

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.

Provided is a first unit including a first unit including a compressor and a first heat exchanger; a plurality of second units each including a second heat exchanger and each being connected to the first unit via a plurality of branched pipes; a plurality of valves configured to open to permit refrigerant flows and close to not permit the refrigerant flows; a storage unit configured to store connection information indicating a relationship of connection between the plurality of second units and the plurality of pipes; a closed path pipe that is any of the plurality of branched pipes to which no second unit is connected, and a control unit configured to detect whether the closed path pipe is included in the connection information.

Air-conditioning apparatus and air-conditioning system determining valve setting error

A heat pump system adjusts a degree of subcooling of an indoor-side heat exchanger in a heating priority mode, and adjusts any one of a degree of subcooling of a hot-water supply-side heat exchanger (water-side heat exchanger) and a discharge temperature of a compressor in a hot-water supply priority mode.

Heat pump system

The air-conditioning apparatus includes a compressor; a heat source side heat exchanger; a use side pressure-reducing mechanism; a use side heat exchanger and an accumulator connected by a pipe so that a refrigerant circulates therethrough; a high-low pressure bypass pipe; a high-low pressure bypass unit installed in the high-low pressure bypass pipe; and a unit controller configured to perform a refrigerant amount detection operation in which an operation frequency of the compressor is controlled so that a value of an evaporating temperature becomes an evaporating temperature target value of the compressor to discharge a liquid-state refrigerant of the refrigerant from the accumulator, and control an opening degree of the high-low pressure bypass unit in performing the refrigerant amount detection operation.

Refrigeration cycle apparatus

A combined air-conditioning and hot water supply system simultaneously executes the cooling operation of a use unit and the hot water supply operation of a hot water supply unit, wherein the combined air-conditioning and hot water supply system operates in a cooling priority mode when the temperature differential &#x394;Tbetween a set hot water supply temperature Tand the inlet water temperature Tof a plate water-heat exchanger is smaller than a priority operation determination threshold M that is set in advance, and operates in a hot water supply priority mode when the temperature differential &#x394;Tbecomes equal to or higher than the priority operation determination threshold M. This simultaneous execution of cooling and hot water supply operations prevents hot water from running out.

Cooling and hot water supply system and cooling and hot water supply method

A refrigeration cycle apparatus simultaneously performs a cooling operation mode in which a refrigerant from a compressor is caused to flow to an indoor heat exchanger of an indoor unit having a cooling load, and a hot water supply operation mode in which a refrigerant from the compressor is caused to flow to a water heat exchanger of a hot water supply unit having a hot water supply demand. An operation control part switches the control mode of the simultaneous cooling and heating and hot water supply operation mode between a cooling-prioritized mode and a hot-water-supply-prioritized mode according to the relationship between the cooling load and the hot water supply load.

The volume ratio of a hot-water-supply-side liquid extension pipe to a water heat exchanger is set to be equal to or more than the minimum volume ratio, which is the volume ratio of the hot-water-supply-side liquid extension pipe to the water heat exchanger when the required refrigerant amount during a cooling and hot water supply simultaneous operation in which an indoor-side heat exchanger serves as an evaporator, the water heat exchanger serves as a condenser, cooling energy is supplied from the indoor-side heat exchanger, and heating energy is supplied from the water heat exchanger is equal to the required refrigerant amount during a heating operation in which a heat-source-side heat exchanger serves as an evaporator, the indoor-side heat exchanger serves as a condenser, and heating energy is supplied from the indoor-side heat exchanger.

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Tokyo, Japan

Shogo Tamaki