Dryer and operating method therefor

A dryer comprising:

• a heating device;
• a tumbler connected to an exit of the heating device and configured to receive one or more objects to be dried;
• a fan connected to an exit of the tumbler;
• a heat exchanger connected to an exit of the fan through a first flow line, the first flow line being configured to carry a working fluid;
• a compressor having (i) an entrance connected to the first flow line and (ii) an exit connected to an entrance of the heat exchanger;
• and
• a regeneration device having an entrance connected to an exit of the heat exchanger,
• wherein the regeneration device is connected to a circulation line configured to carry the working fluid, the circulation line connecting the heating device, the tumbler, the fan, and the heat exchanger,
• wherein the regeneration device comprises:
• a gas-liquid separator that has a gas exit connected to the circulation line,
• a decompression device disposed at at least one of (i) a flow line that connects the exit of the heat exchanger to an entrance of the gas-liquid separator or (ii) a flow line that connects the gas exit of the gas-liquid separator to the circulation line,
• a first bypass line having two ends that are connected to respective ends of the decompression device, and
• a first bypass valve disposed at the first bypass line, and
• wherein the decompression device is one of a plurality of decompression devices including (i) a first decompression device disposed between the exit of the heat exchanger and the entrance of the gas-liquid separator and (ii) a second decompression device disposed in the circulation line at the gas exit of the gas-liquid separator.