Abstract: There are provided an air-conditioning device that can easily perform fan setting to obtain a proper air volume in accordance with external static pressure, and a method of controlling the air-conditioning device. There is executed air volume setting processing (S3 to S14) for measuring an actual rotation number (r_MAX) when a fan motor for driving an air blowing fan is set to a maximum output, and setting the rotation number corresponding to a target air volume of the air blowing fan under normal operation of the built-in type air-conditioning device.

Abstract: There are provided an air-conditioning device that can easily perform fan setting to obtain a proper air volume in accordance with external static pressure, and a method of controlling the air-conditioning device. There is executed air volume setting processing (S3 to S14) for measuring an actual rotation number (r_MAX) when a fan motor for driving an air blowing fan is set to a maximum output, and setting the rotation number corresponding to a target air volume of the air blowing fan under normal operation of the built-in type air-conditioning device.

Abstract: 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.

Abstract: 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

Abstract: An air conditioning system comprises a heat source side unit adapted to condense and supply a fluid which can change a phase between a gas phase and a liquid phase and a plurality of user side units entirely or mostly disposed below the heat source side unit in terms of number and connected to said heat source side unit by piping so as to establish a circulation of the fluid supplied from said heat source side unit passing through said heat source side unit and said user side units by utilizing the difference in specific gravity between the liquid phase and the gas phase of said liquid so that it can provide a cooling/heating effect regardless of the floors where the user side units are installed and the power consumption rate of the system can be minimized.

Abstract: An air conditioning system comprises a heat source side machine such as an absorption type refrigerator, 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 circulates between the heat source side machine and the user side machines by utilizing its own specific gravity difference between the liquid and gas phases and a driving force of an electric pump provided to the liquid phase pipe, so that each of the user side machines can perform cooling operation. A receiver tank is provided to the inlet side of the electric pump, and an upper portion of the receiver tank is connected to the gas phase pipe by a pressure-equalizing pipe so as to improve a start characteristic of the cooling operation.

Abstract: An absorption refrigerating machines-group apparatus that can be installed at reduced cost and prevent the occurrence of abnormal situations due to the unexpected suspension of the operation of a cooling water pump is provided. The absorption refrigerating machines-group apparatus according to the invention comprises a control panel 200 for issuing control signals, an adapter 300 having a control section 310 for relaying control signals and absorption refrigerating machines 100A, 100B, 100C having respective control sections 80, said control sections 310 and 80 being connected by a telecommunications line L51. When a signal for suspending the operation of the shared cooling water pump is relayed, the currently operating absorption refrigerating machines are brought into a temporary state that allows the operation of the cooling water pump P2 to be suspended through an exchange of signals between the control sections 310 and 80.