Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Thermal Systems, Ltd.

Central Glass Company, Limited

Kazuki Wajima

Kenji Ueda

Yasushi Hasegawa

Yoshinori Akamatsu

Fuyuhiko Sakyu

Satoshi Nikaido

Naoya Miyoshi

Yoshie Togano

Ryosuke Suemitsu

Masanobu Sakai

Kanako Osafune

Akimasa Yokoyama

Masaharu Nitta

Akihiro Takemoto

It is an object of the present invention to provide a heat pump that can use, as a refrigerant, a substance with which a geometric isomer exists, and a method for designing the same. The present invention is a method for designing a heat pump () whose closed circuit configured by connecting a compressor (), a condenser (), an expansion valve (), and an evaporator () in this order is filled with a refrigerant containing a refrigerant substance with which a geometric isomer may exist, the method including obtaining an upper limit of stable temperature at which isomerization of the refrigerant substance does not proceed, and setting an upper limit usage temperature of the heat pump () so as not to exceed the upper limit of the stable temperature.

Heat pump and method for designing the same

A purging device that includes a purging pipe for purging a gas mixture containing a coolant and a non-condensable gas from a chiller; a purging tank; a cooling device that has a cooling heat-transfer surface provided therein which condenses the coolant in the gas mixture and is oriented in the height direction inside the purging tank; a drainage pipe for discharging the liquid coolant inside the purging tank to the chiller; an exhaust; a purging tank pressure sensor for measuring the pressure inside the purging tank; and a control device which detects that an increase in the level of the liquid coolant inside the purging tank has occurred when the measured value from the purging tank pressure sensor decreases, and thereafter, increases to a prescribed value or higher, when condensing the coolant by cooling the interior of the purging tank using the cooling device.

Purging device, chiller equipped with same, and method for controlling purging device

A heat source device is provided with a differential pressure sensor that measures the differential pressure between an inlet pressure and an outlet pressure for the chilled water in an evaporator and with a control device. The control device possesses the coefficient of loss for the evaporator and is provided with a chilled-water flow-rate computing portion that calculates a chilled-water flow rate at the evaporator on the basis of the coefficient of loss and the differential pressure output from the differential pressure sensor; a control-command computing portion that generates a control command by using a specification heating-medium flow rate that is set in advance; and a control-command correcting portion that corrects the control command generated by the control-command computing portion.

Heat source device

A control apparatus for a parallel-type chiller provided with multiple shell-and-tube-type heat exchangers and multiple compressors, the control apparatus having an estimation section which estimates a terminal temperature difference in an upstream-side space on the basis of a terminal temperature difference between a saturation temperature of a second fluid and a measured exit temperature value, the saturation temperature being estimated on the basis of a pressure value of the second fluid in a downstream-side space, the measured exit temperature value being a temperature of the first fluid measured at an exit of the heat exchanger, and estimates a temperature of the first fluid in the vicinity of an exit of the upstream-side space on the basis of the terminal temperature difference in the upstream-side space and the saturation temperature of the second fluid in the upstream-side space.

Control apparatus and method for parallel-type chiller, and computer-readable recording medium in which program for parallel-type chiller is stored

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

Heat source system and control method therefor

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Tokyo, Japan

Kazuki Wajima