Mitsubishi Electric Corporation

So Nomoto

Tomotaka Ishikawa

Shinya Higashiiue

Masahiro Ito

Satoru Yanachi

Takashi Okazaki

Takuya Matsuda

Shinichi Ito

Hirokazu Minamisako

Ryo Tsukiyama

Takashi Ikeda

Naofumi Takenaka

Kimitaka Kadowaki

Keisuke Takayama

Joseph Paul Bush

Shogo Tamaki

Daisuke Sakai

Kosuke Tanaka

Osamu Morimoto

Yasushi Sato

Naoki Kato

Yohei Kato

Mamoru Hamada

Tetsuya Yamashita

Daisuke Shimamoto

Takuya Ito

Takeshi Sugimoto

Hirofumi Koge

Yasushi Okoshi

Koji Matsuzawa

Kensaku Hatanaka

Masato Yosomiya

Chitose Tanaka

Kazuyoshi Shinozaki

An air conditioning system comprises one or more air conditioners through which refrigerant circulates, and a first controller. For each of one or more indoor units, a score corresponding to a cost of using the indoor unit is preset. The first controller calculates, for each of the one or more air conditioners, a first total value of a score of each of the one or more indoor units included in the air conditioner. The first controller calculates a second total value of the first total value of each of the one or more air conditioners. When an electrical energy limit condition is satisfied, the first controller sets for each of the one or more air conditioners a drive frequency for a compressor included in the air conditioner according to a ratio of the first total value of the air conditioner to the second total value.

Air conditioning system and method for controlling electrical energy of air conditioning system

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

An air conditioning device has: a refrigerant circuit that includes a compressor, a switching valve, a cascade heat exchanger, an expansion valve and an outdoor heat exchanger connected to one another by a first pipe through which a refrigerant flows, and that performs a defrosting operation in which the refrigerant discharged from the compressor is introduced into the outdoor heat exchanger; a heat-transfer medium circuit that includes a pump, the cascade heat exchanger, and the indoor heat exchanger connected to one another by a second pipe through which a heat-transfer medium flows; and a control device that controls the compressor and the pump. When an amount of heat storage of the heat-transfer medium is less than a threshold, the control device reduces the heating capability of the indoor heat exchanger when the air conditioning device transitions from a heating operation to the defrosting operation.

Air conditioning device

A refrigeration cycle apparatus includes: a first refrigerant route; and a second refrigerant route. In the first refrigerant route, refrigerant flows in order of a compressor, a first heat exchanger, a first pipe, a second heat exchanger, a low pressure receiver and the compressor. The second refrigerant route is connected to the first pipe and the low pressure receiver, the first pipe being connected to the first heat exchanger and the second heat exchanger in the first refrigerant route. The second refrigerant route includes an electric pump. The electric pump is configured to flow the refrigerant from the low pressure receiver to the first pipe.

Refrigeration cycle apparatus

A refrigeration cycle apparatus includes an indoor heat exchanger, a water heat exchanger, a pump, an outdoor heat exchanger, a compressor, an expansion valve, a four-way valve, a third pipe, and an open/close valve, and configured to enable hot-gas defrosting and reverse cycle defrosting. A controller selects, based on the indoor load, either one of the hot-gas defrosting and the reverse cycle defrosting to be performed. In this way, defrosting can be performed with a minimum decrease of the chiller water temperature.

During a first cooling operation, a compressor is in an operational state, a liquid pump is in a non-operational state, and an amount of refrigerant allowing for existence of a liquid surface of the refrigerant in a refrigerant tank is accumulated in the refrigerant tank. During a second cooling operation, the compressor is in the non-operational state, the liquid pump is in the operational state, and the amount of the refrigerant allowing for the liquid surface of the refrigerant in the refrigerant tank is accumulated in the refrigerant tank.

Refrigeration cycle apparatus performing a refrigerant circulation operation using a liquid pump

Each of plural temperature adjustment apparatuses variably adjusts the amount of heat exchange between an inflow medium, which is a liquid medium supplied to a corresponding indoor heat exchanger, and an outflow medium, which is a liquid medium discharged from the corresponding indoor heat exchanger. Each of the plural temperature adjustment apparatuses reduces the heat exchanging capacity of the corresponding indoor heat exchanger by increasing the amount of heat exchange between the inflow medium and the outflow medium when the heat exchanging capacity of the corresponding indoor heat exchanger is larger than the indoor load. When there is no temperature adjustment apparatus in which the amount of heat exchange between the inflow medium and the outflow medium is set to the minimum, the heat source apparatus reduces the heating capacity or the cooling capacity for changing the temperature of the liquid medium.

Air conditioning system

A temperature adjustment apparatus adjusts a temperature of a heating medium that exchanges heat with air in an indoor heat exchanger connected to a heat source apparatus. It includes a first and second pipes through which the heating medium flows, the second pipe being branched into a first and second branch pipes which are thereafter merged, a second heat exchanger in which heat is exchanged between the heating medium in the first branch pipe and the heating medium in the first pipe, and a flow rate regulator that changes a flow rate of the heating medium in the first branch pipe and a flow rate of the heating medium in the second branch pipe. The second pipe supplies the heating medium from the heat source apparatus to the indoor heat exchanger. The first pipe returns the heating medium from the indoor heat exchanger to the heat source apparatus.

Temperature adjustment apparatus, intermediary apparatus, load apparatus, and refrigeration cycle apparatus

An air conditioning apparatus uses a heat medium containing at least one of cold water and hot water. The air conditioning apparatus includes: a heat source device; a heat exchanger configured to exchange heat between the heat medium and air; a flow rate control valve configured to control a flow rate at which the heat medium is supplied to the heat exchanger; a temperature sensor configured to detect a temperature of the heat medium discharged from the heat exchanger; and a failure determination unit configured to detect presence or absence of an abnormality in a flow path of the heat medium based on the temperature detected by the temperature sensor and a commanded degree of opening for the flow rate control valve.

Air conditioning apparatus

A method is provided for controlling an outdoor air conditioner formed outside of a structure, the method including: drawing outdoor air into the outdoor air conditioner; cooling the outdoor air to a dehumidification temperature to provide dehumidified air in the outdoor air conditioner; determining whether an air conditioning load exists in an air conditioning space inside the structure; heating the dehumidified air to generate supply air if it is determined that no air conditioning load exists in the air conditioning space; passing the dehumidified air at the dehumidification temperature as the supply air if it is determined that an air conditioning load exists in the air conditioning space; and providing the supply air to the air conditioning space.

System and method for controlling the operation of an outdoor air conditioner

An air conditioning system includes: a plurality of indoor units each configured to condition air in a target space; and an outdoor unit connected to the plurality of indoor units. Each of the plurality of indoor units has a surface temperature measuring device configured to measure a surface temperature of an object in the target space. When a total of capacities requested by the plurality of indoor units is larger than a capacity of the outdoor unit, each of the plurality of indoor units performs a process corresponding to a change amount of the surface temperature per unit time.

An air conditioning system with precisely controlled dehumidification functions is disclosed. The air conditioning system comprises an indoor air handling system comprising a primary heat exchanger and a secondary heat exchanger. The indoor air handling system can be coupled to an outdoor unit comprising a compressor and an outdoor heat exchanger. When a controller system receives a measured humidity that exceeds a set humidity, the controller system can increase the cooling capacity of the air conditioning system to meet a set temperature. Once the set temperature is met, the controller system can switch to a dehumidification mode wherein the primary heat exchanger is cooled and the secondary heat exchanger is activated. When the measured temperature exceeds the set temperature, the controller system can switch from the dehumidification mode back to cooling mode.

Air conditioning system with dehumidification mode

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

A refrigerating apparatus includes a high-temperature side circuit and a low-temperature side circuit connected to each other via a cascade condenser, a low-temperature side second flow control valve that turns a refrigerant, passing through a liquid pipe connecting between a cooling unit and other circuit parts in a low-temperature side circuit b, into a gas-liquid two-phase refrigerant, and an expansion tank connected to the suction side of a low-temperature circuit compressor via a tank electromagnetic valve.

Growing community of inventors

Tokyo, Japan

So Nomoto