Sanyo Electric Co., Ltd.

Toshio Kubo

Mamoru Kubo

Hidetoshi Arima

Kazuo Takahashi

Nobuhiro Idei

Masashi Izumi

Toshio Nakayama

Toshio Fukushima

Akira Hatakeyama

Kazuhiro Shimura

Naohito Sakamoto

Hiroyuki Takada

Hisao Honda

Takaaki Tamura

Wazou Yamada

Junichi Saitou

An air conditioning system comprises a heat source side machine, a plurality of user side machines more than half of which are disposed below the heat source side machine, and liquid phase and gas phase pipes connecting the heat source side machine with the user side machines to form a closed circuit. A phase-changeable fluid included in the closed circuit circulates by utilizing its own specific gravity difference between the liquid and gas phases, so that each of the user side machines can perform cooling and heating operations. The liquid phase pipe and the gas phase pipe can communicate with each other via a gas bypass circuit and/or a liquid bypass circuit including a open-close valve and liquid level detection means, so that bubbles or condensed liquid generated in the closed circuit can be exhausted quickly.

Air conditioning system

In an air conditioning system for circulating a fluid which can change a phase between a gas phase and a liquid phase by a difference of a specific gravity between the gas phase and the liquid phase between an heat source side machine and a plurality of user side machines more than half of which are disposed below the heat source side machine, so that each of the user side machines performs a cooling operation, each of the user side machines is provided with a heat exchanger, a flow control valve for controlling a volume of said fluid supplied to the heat exchanger, a blow means for supplying an air-conditioned air to a room through the heat exchanger, a physical value detecting means for detecting a physical value relating to an air conditioning load such as a temperature and a signal controlling means for the operating and detecting portions, and wherein the heat source side machine is provided with a control means for communicating with said signal controlling means and outputting a control signal to said flow control valve of the user side machine. Accordingly, even in the case that the cooling load is the same, the opening ratio of the flow control valve of the user side machine mounted on the higher floor can be controlled so as to be greater than that of the user side machine mounted on the lower floor. In accordance with the above structure, the air conditioning characteristic in the air conditioning system which is basically controlled by a natural circulation and in which it is hard to supply the fluid to the user side machine mounted on the higher floor, so that it is hard to operate the air conditioning can be improved.

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Gunma-ken, Japan

Toshio Kubo