Abstract: A heat exchanger comprises double-plated material with good heat conductivity and endurance in the shape of drum with convex wall or cylinder or rectangular shape having inlet(s) for first fluid to be cooled to flow into space between the double layer and out through outlet(s). A plurality of heat exchangers are connected through an inlet tubing where first fluid flows into each heat exchanger and flows out through a connecting outlet tubing. Heat exchange is made between the first fluid and large volume of second fluid the heat exchanger immersed in, where the term fluid covering all types of liquids and gases. The present design efficiently allows heat exchange while clogging is avoided. Installation of elements within heat exchanger to cause change in direction of flow of first fluid increases rate of heat transfer. The disclosed heat exchanger is used as condenser in air-conditioner either in building or in vehicle.

Abstract: Combination of a water cooled condenser, a cooling tower, a compressor and several controlling components to combine into one single unit of a compound condensing system makes it much more efficient in operation. Layer arrangement is constructed where reshuffled or rearrangement is possible to give similar outcome. This helps saving of electrical energy, prolonging the life of compressor, in addition to minimize global warming.

Abstract: This rotary compressor with an installed circulation control unit utilizes a method to control a rotary compressor to start or stop injecting refrigerant at a predetermined velocity by means of an electromagnetic coil that is installed onto the rotary compressor. The end of the electromagnetic coil is tenon-shaped and enters into a mortise that is formed on a vane or an arm of the rotary compressor so that the operation alternates between suction and compression at a predetermined period, enabling control of the rate of refrigerant circulation. In addition, the rotary compressor does not restart during its operation, which enhances the performance of the air-conditioning system, saves costs and energy, and enables the air-conditioning system to be easily maintained and repaired.

Abstract: A spinning clothes-hanger which spins to help hastening drying of clothes comprises a shaft standing upright held in place through a shield having ball-bearing cartridge at both upper and lower ends where shield is mounted upright to a stand having at least three legs. A motor is installed at one end of the shaft and held in place by bars to the stand where upon turning on, motor drives shaft to spin freely about its axis. One or several circular or any geometric frames sharing same center mounted to bars extended from a body at the center where the body is fixed to another end of the shaft. Alternative holders are used in stead of stand to hold motor and shield for installing the spinning clothes-hanger from ceiling or against a wall. Spring or other mechanisms is alternatively used to spin the shaft.