Sanyo Electric Co., Ltd.

Naohito Sakamoto

Kazuhiro Shimura

Mamoru Kubo

Hidetoshi Arima

Ichiro Kamimura

Nobuhiro Idei

Akira Hatakeyama

Hiroyuki Takada

Toshio Kubo

Hisao Honda

Yukiharu Inoue

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.

Air conditioning system

In an air conditioning system comprising a heat source side machine for condensing a fluid which can change a phase between a liquid phase and a gas phase to a predetermined temperature and for supplying, and a plurality of user side machines more than half of which are disposed below said heat source side machine, in which piping is constructed in such a manner as to circulate the fluid supplied from said heat source side machine by using a difference in specific gravity between the liquid phase and the gas phase, between said heat source side machine and said user side machine and a cooling of said user side machine is performed by evaporating said fluid in said user side machine, the heat source side machine is provided with a control means for descending a set temperature of said fluid discharged from said heat source side machine after condensed by changing the operating capacity of said heat source side machine when a state that the temperature of said fluid returned back after evaporated in the user side machine at a time of a cooling is higher than a predetermined temperature continues for a predetermined time period. Accordingly, even when the cooling effect is insufficient due to the super-heated state of the fluid in the user side machine, the super-heated state of the fluid is resolved after the predetermined time has passed, thereby returning to the normal cooling

An air conditioner using a non-azeotropic mixture refrigerant formed of a high boiling-point refrigerant and a low boiling-point refrigerant is provided with a first temperature sensor for detecting a temperature at an inlet of an outdoor heat exchanger when the outdoor heat exchanger serves as an evaporator in heating cycle, a second temperature sensor for detecting an outside air temperature, and a controller for controlling an opening degree of an expansion valve on the basis of a temperature difference between the outside air temperature and the inlet temperature of said evaporator. For example, the opening degree of the expansion valve is controlled so that the temperature difference between the outside air temperature and the inlet temperature is equal to a predetermined value.

Air conditioner having frost preventing member

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Gunma-ken, Japan

Naohito Sakamoto