The theory of heat pump originated from the early 19th century French scientist Sadi Karnot. Kano first proposed the "Carnot Cycle" theory in 1824. 30 years later, the British scientist L. Kelvin It was proposed in early 1850 that the freezer can be used for heating, and many scientists and engineers have conducted extensive research on the heat pump for 80 years. In 1912, Zurich, Switzerland, successfully installed a heat pump unit with river water as a low-level heat source for heating. This was the early water source heat pump system and the world's first heat pump system. The heat pump industry developed rapidly in the 1940s and early 1950s, and heat pumps for domestic heat pumps and industrial buildings began to enter the market, and heat pumps entered an early stage of development. In the 21st century, with the emergence of the “energy crisisâ€, fuel prices have risen sharply. The improved and mature heat pump has regained its historical stage and become the most valuable new energy technology with its high-efficiency recovery of low-temperature environmental heat energy and energy saving and environmental protection. . The former International Thermal Energy Agency has set up an international heat pump center and set up a Heat Pump Programme to promote the application and development of heat pump technology to countries around the world. The governments of the United States, Canada, Sweden, Germany, Japan, and South Korea have issued special official guidelines to promote the social application of heat pump technology. B2 Grade Aluminum Composite Panel Aluminium Sandwich Panel,Composite Panel Aluminium,Aluminum Composite Panel For Sale,Aluminum Composite Material Panels SHAOXING YOTO IMPORT&EXPORT CO., LTD , https://www.sxyoto.com