Dehumidifier for a compressor in compression-absorption heat pump system

A 2-stage compressing-absorbing type heat pump system, the system comprising:

• an expansion device configured to expand a high-temperature and high-pressure refrigerant-absorbent mixture, wherein the high-temperature and high-pressure refrigerant-absorbent mixture are changed into a low-temperature and low-pressure refrigerant-absorbent mixture;
• a desorber configured to receive the low-temperature and low-pressure refrigerant-absorbent mixture from the expansion device and to evaporate a part of a refrigerant from the refrigerant-absorbent mixture;
• a low-pressure compressor configured to compress the refrigerant evaporated by the desorber;
• a pump configured to pressurize the refrigerant-absorbent mixture in a state of a dilute and concentrated solution that remains in a state where a part of the refrigerant is evaporated by the desorber by using a high-pressure solution;
• an intermediate cooler configured to mix an intermediate pressure refrigerant ejected from the low-pressure compressor with the low-temperature refrigerant-absorbent mixture ejected from the pump and diverges and cools a part of the low-temperature refrigerant-absorbent mixture;
• a high-temperature compressor configured to compress a vapor refrigerant in the intermediate cooler;
• an absorber configured to absorb a high-temperature and high-pressure refrigerant ejected from the high-pressure compressor in a high-pressure refrigerant-absorbent mixture ejected from the pump;
• and
• a dehumidifier configured to absorb a liquid-state absorbent contained in a low-temperature refrigerant flowing into the low-pressure compressor and to regenerate the liquid-state absorbent by using the high-pressure refrigerant ejected from the high-temperature compressor so as to enable the liquid-state absorbent to flow together with the high-pressure refrigerant,
• wherein the dehumidifier comprises:
• a first dehumidifying member and a second dehumidifying member configured to absorb moisture;
• a first flow passage controlling valve comprising a first inlet through which a low-temperature vapor refrigerant ejected from the desorber flows, a second inlet through which a high-temperature and high-pressure vapor refrigerant ejected from the high-temperature compressor flows,
• a first communication pipe configured to communicate with the first dehumidifying member, and a second communication pipe configured to communicate with the second dehumidifying member,
• a first operating mode is activated by ejecting low-temperature refrigerant from the first inlet which is discharged to the second dehumidifying member, wherein moisture contained in the low-temperature refrigerant is absorbed and the high-temperature refrigerant is simultaneously ejected from the second inlet that is discharged to the first dehumidifying member so that the first dehumidifying member is regenerated, and
• a second operating mode is activated by low-temperature refrigerant ejected from the first inlet which is discharged to the first dehumidifying member, wherein moisture contained in the low-temperature refrigerant is absorbed and the high-temperature refrigerant is simultaneously ejected from the second inlet that is discharged to the second dehumidifying member so that the second dehumidifying member is regenerated, wherein
• the first flow passage controlling valve further comprises:
• a first cylinder;
• a first double head piston having two ends each having a single piston head operated in forward or backward movement along a horizontal direction within the first cylinder;
• a first communication member, fixed to a middle of the first double head piston, moving as a one body with the first double head piston in the first operating mode,
• the first inlet communicating with the first communication pipe in the second operating mode,
• a first controller configured to control forward or backward movement of the first double head piston, wherein
• the first operating mode and the second operating mode are alternately activated by forward or backward movement of the first double head piston;
• and
• a second flow passage controlling valve comprising a first outlet that communicates with an inlet of the high-pressure compressor, a second outlet that communicates with the absorber, a third communication pipe that communicates with the first dehumidifying member, and a fourth communication pipe that communicates with the second dehumidifying member, wherein
• the second flow passage controlling valve further comprises:
• a second cylinder;
• a second double head piston having two ends each having a single piston head operated in forward or backward movement along the horizontal direction within the second cylinder;
• a second communication member, fixed to a middle of the second double head piston, moving as a one body with the second double head piston in the first operating mode,
• the second inlet communicating with the second communication pipe in the second operating mode,
• a second controller configured to control forward or backward movement of the second double head piston, wherein
• the first flow passage controlling valve is arranged at an upper portion of the first and second dehumidifying members, and the second flow passage controlling valve is arranged at a lower portion of the first and second dehumidifying members, and the first double head piston is symmetrically arranged with the second double head piston, and wherein
• when the first operating mode is enabled in which the refrigerant dehumidified by the second dehumidifying member is discharged to the low-pressure compressor via the first outlet and the refrigerant used in regenerating the first dehumidifying member is discharged to the absorber via the second outlet, and
• when the second operating mode is enabled in which the refrigerant dehumidified by the first dehumidifying member is discharged to the low-pressure compressor via the first outlet and the refrigerant used in regenerating the second dehumidifying member is discharged to the external device via the second outlet.