Preliminary measurement campagne for experimental studies of the expansion cycle in a double-acting piston expander using intermittent supply of humid air in micro-CAES applications

The experimental investigations were conducted on a test rig developed by the EECS research group. The PWM function enables effective regulation of compressed air consumption by controlling the air intake into the chamber.

Depending on the piston position during expander operation, the air mass flow rate is regulated using the PWM function. When the piston reaches the position x_PWM, a control signal is sent to the appropriate solenoid coil to close the valve. The system was equipped with sensors to monitor pressure, temperature, and piston position.