Heat Pump Development History

In the early nineteenth century, French scientist Sadi karnot first proposed the "Carnot cycle" theory in 1824, which became the origin of heat pump technology. In 1852, the British scientist Kelvin (L.Kelvin) proposed that the refrigeration device can be used for heating, and the reverse Carnot cycle is used for the heat pump idea of heating. He was the first to propose a formal heat pump system, known at the time as a "heat multiplier". After that, many scientists and engineers conducted a lot of research on heat pumps, and the research continued for 80 years. In 1912, Zurich, Switzerland successfully installed a set of heat pump equipment using river water as a low-level heat source for heating. This is an early water source heat pump system and the first heat pump system in the world. The heat pump industry developed rapidly from the 1940s to the early 1950s. Household heat pumps and heat pumps for industrial buildings began to enter the market, and heat pumps entered the early stage of development. Since the 1970s, the heat pump industry has entered a golden age. All countries in the world have attached great importance to the research work of heat pumps. For example, the International Energy Agency and the European Community have formulated large-scale heat pump development plans. Continuous development, widely used in air conditioning and industrial fields, plays a major role in energy conservation and environmental protection. In the 21st century, with the emergence of the "energy crisis" and the sudden rise in fuel prices, the improved and mature heat pump has re-emerged on the stage of history and has become the most valuable new energy technology due to its high-efficiency recovery of heat in low-temperature environments, energy saving and environmental protection. . The former International Thermal Energy Agency specially established the International Heat Pump Center and established the Heat Pump Program to promote and coordinate the application and development of heat pump technology to countries around the world. The governments of the United States, Canada, Sweden, Germany, Japan, South Korea and other countries have issued special official guidelines to promote the social application of heat pump technology. Compared with the development of heat pumps in the world, the research work on heat pumps in China started about 20-30 years later. After the founding of New China, with the arrival of a new upsurge in industrial construction, heat pump technology began to be introduced into China. After entering the 21st century, due to factors such as the rapid urbanization of China's coastal areas, the growth of per capita GDP, the 2008 Beijing Olympic Games and the 2010 Shanghai World Expo, the development of China's air-conditioning market has been promoted, and the application of heat pumps in China has become more and more extensive. The development of heat pump is very rapid, and the research of heat pump technology is constantly innovating. Since the start of heat pumps in 2001, after five years of cultivation, China's heat pump industry has begun to shift from the introduction period to the growth period. The rapid development of the heat pump industry, on the one hand, benefits from the energy shortage, which makes the energy-saving advantages of heat pumps more and more obvious. On the other hand, it has a lot to do with the participation of various forces to promote technological innovation in the industry.