Mitsubishi Heavy Industries Limited

International Center for Environmental Technology Transfer

Mitsubishi Heavy Industries Thermal Systems, Ltd.

Seiichi Okuda

Shigemitsu Kikuchi

Tatsuru Nagai

Kenji Ueda

Minoru Matsuo

Makoto Kishi

Noriyuki Matsukura

Masato Mitsuhashi

Hiroshi Igawa

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 air refrigerant type freezing and heating apparatus has a compressing mechanism that compresses an air refrigerant. As the air refrigerant is heated by a first heat exchanger and further heated by a heater, the temperature of the air refrigerant is increased to more than 200&#xb0; C. and the air refrigerant is supplied to an oven. Heat of the air refrigerant outputted from the oven is recovered by a second heat exchanger, and supplied to a high-temperature side of the first heat exchanger. The air outputted from the second heat exchanger is cooled by a cooler and a third heat exchanger, is adiabatically expanded by an expansion turbine to be cooled to &#x2212;85&#xb0; C., and is supplied to a freezer. The air of the freezer is recovered to be supplied to the low-temperature side of the third heat exchanger, and then is supplied to the compressor.

Air refrigerant type freezing and heating apparatus

The present invention provides a technique for rapidly removing frost accumulated in air-refrigerant cooling apparatuses. An air-refrigerant cooling apparatus in accordance with the present invention includes a bypass line for directly supplying a defroster with refrigerant air having an increased temperature from a compressor, avoiding temperature drop by a heat exchanger and an expansion turbine. Moisture of the frost melted in the defroster is externally exhausted by a fan.

Air-refrigerant cooling apparatus with a warm gas defrost bypass pipe

The purpose present invention is to provide an air refrigerant type cooling apparatus provided with an internal air cooling mechanism with high reliability and efficiency. Another object of the present invention is to provide an air refrigerant cooling/heating system with a simplified configuration using the air refrigerant type cooling apparatus. To accomplish the purpose, a heat radiating means is provided in a motor of an air refrigerant type cooling apparatus having a compressor, the motor and an expansion turbine in the present invention. Also, a pressure difference is positively generated between the inside and outside of the motor. By these means, when the motor is driven, the heat from the stator main body is exhausted to the outside of the motor through the heat radiating means and the heat from the coil end portions is exhausted through the cooling air exhausted from the inside to the outside of the motor. Further, a guide plate is located adjacent to the cooling air inlet in the motor, so that the intake cooling air is efficiently guided to the stator coil end portions. By this means, the heat generated from the coil end portions is efficiently exhausted from the inside to the outside of the motor. According to these configurations, an air refrigerant cooling apparatus can be realized. Moreover, by installing the air refrigerant cooling apparatus to a cooling/heating system, an air refrigerant cooling/heating system having simple configuration and very high reliability can be provided.

Air refrigerant type cooling apparatus and air refrigerant cooling/heating system using refrigerant type cooling apparatus

An air refrigerant cooling apparatus has magnetic bearings with high reliability and high efficiency. The air refrigerant cooling apparatus includes a motor having a first magnetic bearing and a second magnetic bearing for supporting a shaft, a compressor and an expansion turbine. The compressor is connected to the shaft and separated from the first magnetic bearing by a first labyrinth. The expansion turbine is connected to the shaft and separated from the second magnetic bearing by a second labyrinth. Pressure differences are generated between spaces where the first magnetic bearing and the second magnetic bearing are provided and respective inlet of the compressor and outlet of the expansion turbine by an external pressure outside the motor.

Growing community of inventors

Kanagawa, Japan

Seiichi Okuda