Mitsubishi Electric Corporation

Nec Corporation

Mitsubishi Denki Kabushiki Kaisha

Masashi Fujitsuka

Yuki Mori

Tomihiro Takano

Kazunori Tsuchino

Takahiro Nakai

Motohiko Kawagishi

Takeshi Mori

Minoru Sato

Yosuke Shinomoto

Yoshihiro Takahashi

Taro Kato

Hideaki Maeyama

Akira Satake

Naoto Shimada

Naoki Nishio

Yasuhiro Kojima

Keiko Tada

Kazuhiko Kawajiri

Tetsuhide Yokoyama

Takaya Yamamoto

Masaya Kimura

Shunkei Suzuki

Yoshitaka Uno

Hiroshi Enomoto

Shogo Moroe

Hiroshi Maitani

The present invention has an object to provide a refrigeration cycle apparatus. A refrigeration cycle apparatus according to the present invention includes: a compressor; and a control apparatus configured to calculate a rotation number command of the compressor. The control apparatus includes a capacity controller configured to calculate the rotation number of the compressor as a capacity rotation number, a protection controller configured to calculate the rotation number of the compressor as a protection rotation number and a rotation number selection unit configured to select any one of the capacity rotation number and the protection rotation number as the rotation number command of the compressor. The rotation number command of the compressor is calculated so that at least any one of causing the current capacity value to approach the capacity target value and causing the protection variable to approach the protection target value is satisfied.

Refrigeration cycle apparatus

An air-conditioning apparatus includes: room temperature sensors; room temperature setting units; a compressor that causes refrigerant to circulate through an outdoor heat exchanger, electric expansion valves, and indoor heat exchangers; a calculation unit including an integrator for a temperature deviation; an output unit that outputs a total opening degree; a calculation unit that uses a required capacity and the total opening degree; a derivation unit that obtains a distance function with a valve opening degree and a temporary valve opening degree as an evaluation function; a derivation unit that obtains equality constraints for equalizing the sum of opening degrees as a variable to the total opening degree; a calculation unit that calculates upper and lower limits of each opening degree; a derivation unit that obtains inequality constraints in which each opening degree falls within the range between the upper and lower limits; and a calculation unit that calculates the opening degrees from the evaluation function and the equality and inequality constraints, whereby the room temperature deviation can be made to approach the minimum value.

Air-conditioning apparatus and air-conditioning method

An information processing system includes a storage which stores a plurality of operators, in association with current operations and work histories; a detection unit which detects an anomaly; an anomaly responder determination unit which determines a first operator who is intended to respond to the anomaly, from among the plurality of operators who are stored in the storage, on the basis of the work histories; an operation assignment unit which carries out an assignment of a new operation cluster upon a second operator, an unfulfilled operation identification unit which identifies an unfulfilled operation which has arisen due to the first operator responding to the anomaly; and an operator determination unit which determines an operator who is intended to respond to the unfulfilled operation on the basis of the current operations of each of the operators which are stored in the storage.

Information processing device, control method thereof, and control program

The present invention provides a method, a program, and a device that can accurately learn a causal relationship in a deterministic system and a system that performs anomaly analysis by using the causal relationship. A causal relationship learning device according to one example embodiment of the present invention includes: a correlation determination unit that determines a correlation between measurement values measured by two sensors; and a low correlation causal relationship estimation unit that, when the correlation is lower than a predetermined reference, determines a causal relationship between the two sensors by estimating one of the measurement values which is a cause from the other of the measurement values which is a result.

Causal relationship learning method, program, device, and anomaly analysis system

A refrigeration cycle apparatus controller includes an expansion-valve controller configured to output an opening-degree command for an expansion valve based on a deviation between a discharge temperature of refrigerant discharged from a compressor and a set discharge temperature, and at least two control parameters including a proportionality coefficient and an integral coefficient, a flow-rate-correction-coefficient calculator configured to calculate a flow-rate correction coefficient from a refrigerant flow rate of refrigerant circulating through a refrigerant circuit and a preset flow-rate reference value, and a coefficient corrector configured to calculate the proportionality coefficient by correcting a preset proportionality-coefficient reference value based on the flow-rate correction coefficient, and calculate the integral coefficient by correcting a preset integral-coefficient reference value based on the flow-rate correction coefficient. The proportionality coefficient and the integral coefficient are calculated such that a variation range of the integral coefficient rate is larger than a variation range of the proportionality coefficient.

Control device for refrigeration cycle apparatus, and control method for refrigeration cycle apparatus, and refrigeration cycle apparatus

A heat pump apparatus, including: a two-cylinder compressor including: an electric motor; two compression units to be driven by the electric motor, the two-cylinder compressor being structured to switch between two operation modes including single operation in which one of the compression units is brought into a non-compression state, and parallel operation in which both the compression units are brought into a compression state; an inverter drive control device supplying drive power to the electric motor of the two-cylinder compressor; an operation mode detecting-determining unit determining a current operation mode based on an electric signal acquired from the inverter drive control device; and a capacity control device determining a rotating frequency of the electric motor so that a temperature of a target object is brought close to a set value, to thereby control the inverter drive control device based on a result of determination of the operation mode detecting-determining unit.

Heat pump apparatus

A first circulation channel connects a first heat demand part and first supply heat exchanger with its forward route and return route. Supply and discharge channels are connected to a first heat accumulation tank, which accommodates a second heat medium heated in the first supply heat exchanger and supplied via the supply channel. A heat accumulation switching valve changes over communication of the second heat medium serving as hot heat or cold heat flowing from the first supply heat exchanger and supplied to the first heat demand part without branching to the supply channel or branching to the supply channel and supplied to the first heat accumulation tank. A heat-accumulating hot-water-supplying air conditioner operates at a first temperature when the second heat medium from the first supply heat exchanger branches to the supply channel, and at a second lower temperature when the second heat medium does not branch to the supply channel.

Heat-accumulating hot-water-supplying air conditioner

A thermal storage and exchange heating apparatus includes: a thermal storage tank that stores a heated heat medium; a circulation channel connected to high and low temperature sides of the thermal storage tank, and through which the heat medium circulates; a heat exchanger provided to the circulation channel and configured to exchange heat between the heat medium and a heating object, to heat the heating object; a circulation direction switch configured to switch circulation of the heat medium in the circulation channel between a forward direction from the high-temperature side to the low-temperature side and a reversed backward direction; and a controller configured to cause the heat medium to circulate in the forward direction by switching the circulation direction switch in a heating operation and causing the heat medium to circulate in the backward direction by switching the circulation direction switch after a stop of the heating operation.

Heating apparatus

A control apparatus for a heat pump hot water supply system of the indirect heating method is provided such that a change in heat transfer efficiency of a second heat exchanger is estimated by using either or both of a tank water temperature and a temperature of a second refrigerant flowing through a water circuit. When the heat transfer efficiency is determined to be high, an operation switching unit raises an output of a heat source device. When the heat transfer efficiency is determined to be low, the operation switching unit lowers the output of the heat source device.

Hot water supply system control apparatus and hot water supply system control program and hot water supply system operating method

A transmitting circuit is connected to a power line at current flow-in sides to solar battery strings, and a receiving circuit is connected to the power line at current flow-out sides to the solar battery strings. An attenuating circuit connected in series to a bypass diode is provided in a bypass circuit. The transmitting circuit transmits a periodic signal of a predetermined frequency to the power line. The receiving circuit receives via the solar battery strings a transmission signal transmitted from the transmitting circuit to the power line. A determining circuit determines that, when it is detected that an amplitude of a transmission signal received by the receiving circuit is attenuated by a predetermined value or more, direct-current power is conducted to the bypass circuit.

Solar power generation device

In a power system stabilization system for stabilizing a small-scale electric power system to which electric power generated by a rotating power generator is supplied, an electric water heater receives electric power from the electric power system and heats water, a system frequency measuring device measures system frequency of the electric power system, and a hot water controller increases the power consumption of the electric water heater when the system frequency exceeds a reference frequency, and decreases the power consumption of the electric water heater when the system frequency is less than the reference frequency.

Power system stabilization system

A turbocompressor system and a method for controlling the same are disclosed in which an appropriate amount of air can be supplied from a compressor to a load section in accordance with varying requirements of the load section, and in which the pressure of air delivered from the compressor can be maintained constant at all times irrespective of operating conditions of the system such as load-varying transitional operation or steady-state operation. A turbine for driving the compressor is driven to run by exhaust gas discharged from the load section, and the output power of the turbine is controlled to be constant in various ways in a feedback manner.

Growing community of inventors

Tokyo, Japan

Masashi Fujitsuka