Mitsubishi Heavy Industries Thermal Systems, Ltd.

Mitsubishi Heavy Industries Limited

Akimasa Yokoyama

Yasushi Hasegawa

Kenji Ueda

Satoshi Nikaido

Noriyuki Matsukura

Ryosuke Suemitsu

Masanobu Sakai

Kazuki Wajima

Takahiro Kono

The present invention provides a control device for detecting an abnormal operation state of a compressor in a parallel refrigerator. The control device is a control device for a refrigerator that includes a plurality of compressors connected in parallel, and detects occurrence of surging and occurrence of droplet suction on the basis of a deviation between values of currents flowing through electric motors that is configured to drive each of the plurality of compressors, and an operation point indicated by the air volume and the compression ratio of the plurality of compressors.

Control device, refrigerator, control method, and abnormality detection method

The purpose of the present invention is to provide: a turbo compressor which is provided with an open impeller and has the minimal gap between the shroud and the impeller such that efficiency is improved and the safe operating region is enlarged; and a turbo chiller using the same. The turbo compressor is provided with an open impeller with a shroud provided on the side of a casing, and the rotary shaft is supported by a radial magnetic bearing and a magnetic thrust bearing. The turbo compressor is provided with a control unit that comprises: a load calculating means that calculates the axial thrust load generated by the pressure distribution of the compressor; and an axial support position control means that controls a gap between the impeller and the shroud to be a target gap by varying, on the basis of the axial thrust load, the axial support position of the rotary shaft due to the magnetic thrust bearing.

Turbo compressor and turbo chiller using same

The present invention has an object to suppress an overshoot in the outlet temperature of a heat medium. A heat source machine controlling apparatus includes a computing unit and a set temperature changing unit. The computing unit calculates a load change rate using a predetermined arithmetic expression. The set temperature changing unit determines whether or not the load change rate calculated by the computing unit exceeds a predetermined threshold value. In the case where the load change rate exceeds the predetermined threshold value, the set temperature changing unit changes a set chilled water outlet temperature so as to suppress a change in a chilled water outlet temperature. For example, in the case where the chilled water outlet temperature is on a falling trend, if the set chilled water outlet temperature is set to a relatively high value, the heat source machine load decreases, and the chilled water outlet temperature is controlled to coincide with the set chilled water outlet temperature after the change. Consequently, an overshoot can be suppressed.

Heat source machine and control method therefor

Provided is a heat source system that includes two heat source devices connected in series to a heat medium and can be efficiently operated. A heat source system () reduces the temperature of chilled water that is guided from a cooling load and has a predetermined return temperature Tr, to a predetermined supply temperature Ts, and supplies the chilled water to the cooling load. The heat source system () includes: a second centrifugal chiller (TR) that reduces the temperature of the chilled water from the return temperature Tr to an intermediate temperature T; a first centrifugal chiller (TR) that reduces the temperature of the chilled water that has been reduced to the intermediate temperature Tby the second centrifugal chiller (TR), to the supply temperature Ts; and a control unit () that variably sets the intermediate temperature T

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Tokyo, Japan

Akimasa Yokoyama