Abstract: A heating and cooling device includes a cylinder having a chamber for receiving a gas. A guiding groove is defined in an inner periphery of the chamber. A piston assembly is movably received in the chamber of the cylinder. The piston assembly includes first and second pistons and a connecting rod connected to the first and second pistons. The first piston is mounted to a side of the second piston and rotatable relative to the connecting rod. Each of the first and second pistons includes a plurality of openings. A guiding block is formed on an outer periphery of the first piston and is slideably received in the guiding groove.

Abstract: A closed-type drying system a drying chamber with glass windows to allow light entering, an condensation and heating system connected between two distal ends of the drying chamber and controlled by an automatic control system, the condensation and heating system including an air blower for blowing air through the drying chamber, a heater for heating air passing through the drying chamber, two evaporators for condensing moisture from output air of the drying chamber, a heat energy reclamation chamber connected between the air blower and the evaporator, a condenser mounted inside the heat energy reclamation chamber for preheating air passing through the heat energy reclamation chamber, a first compressor mounted in the heat energy reclamation chamber for heat exchange with the flow of air passing through reclamation chamber, and a second compressor adapted to provide low temperature conditions (if needed) in the drying chamber.