Patent ID: 11859605
Assignee: HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO., LTD.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 7:
8. A method for controlling a compressor system including a compressor that compresses suctioned gas to discharge the compressed gas, an aftercooler that cools the compressed gas, a first cooling liquid pathway through which a cooling liquid is supplied to the compressor by a first pump, the cooling liquid being cooled by a cooling heat exchanger, and a second cooling liquid pathway through which the cooling liquid is caused to flow through the aftercooler by a second pump, waste heat from the cooling liquid being recovered by a heat recovery heat exchanger,
wherein a bypass pathway that connects the first cooling liquid pathway and the second cooling liquid pathway, and a valve disposed in the bypass pathway are provided, and
when a discharge gas temperature of the compressed gas that has been discharged is higher than a predetermined temperature, control is performed in a heat recovery mode A in which the valve is closed and the first cooling liquid pathway and the second cooling liquid pathway are independent of each other, and when the discharge gas temperature is lower than the predetermined temperature, control is performed in a heat recovery mode B in which the valve is opened and the first cooling liquid pathway and the second cooling liquid pathway communicate with each other.