Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Thermal Systems, Ltd.

Tatsuru Nagai

Noriyuki Matsukura

Seiichi Okuda

Kenji Ueda

Minoru Matsuo

Makoto Kishi

Masaharu Nitta

A hot-water heat pump that is capable of reducing installation costs and installation space and also reducing the heating time of a hot-water route, and a method of controlling the same are provided. The hot-water heat pump () is provided with a hot-water-heat-pump main unit () that includes a thermal output heat exchanger that absorbs heat from a heat-source route and outputs heat; hot-water route (and) that receive heat outputted from the thermal output heat exchanger; a three-way valve () provided in the outlet-side hot-water route (); and a controller that controls the hot-water-heat-pump main unit () and the three-way valve (), wherein the controller controls the size of openings of the three-way valve () so that a portion of the outlet-side hot-water route () leading out of the thermal output heat exchanger is guided to an upstream side of the thermal output heat exchanger.

Hot-water heat pump and method of controlling the same

An object is to provide a turbo-refrigeration-unit control device capable of achieving stable operation and reducing the amount of refrigerant. Provided is a control device for controlling a turbo refrigeration unit that includes a centrifugal compressor, a first-non-refrigerant pump for supplying a first non-refrigerant, a condenser that performs heat exchange between the first non-refrigerant and a refrigerant, an expansion valve that expands the refrigerant, a second-non-refrigerant pump for supplying a second non-refrigerant, an evaporator that performs heat exchange between the second non-refrigerant and the refrigerant, a bypass circuit that is used to inject part of the refrigerant from a discharge port of the centrifugal compressor into a suction port of the centrifugal compressor, and a bypass-circuit control valve that controls the flow rate of the refrigerant.

Turbo refrigeration unit, control device therefor, and control method therefor

An oil separation device having an outer cylinder that extends in an axial direction; an inner cylinder that passes through the interior of the outer cylinder in the axial direction; a pair of end plates provided at both ends of the outer cylinder in the axial direction; an inlet port connected to the outer cylinder near one of the end plates and that introduces an oil-containing fluid discharged from a compressor into a space formed between the outer cylinder and the inner cylinder so as to swirl about the axis; an outlet port connected to the outer cylinder near the other end plate and that expels the fluid, from which the oil has been centrifugally separated, out of the space; and an oil discharge port, provided in the outer cylinder, for discharging the separated oil out of the space. A partition plate that extends over at least part of a cross-section perpendicular to the axial direction to partition the space in the axial direction is provided in the space.

Oil separation means and refrigeration device equipped with the same

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Tokyo, Japan

Tatsuru Nagai