my country has a vast territory and its climate covers cold, warm and tropical areas. According to my country's "Building Climate Zoning Standard" (GB 50178-93), the country is divided into 7 first-level regions and 20 second-level regions. Correspondingly, the design and application methods of air source heat pumps should be different in various regions. [1]
(1) For areas with hot summers and cold winters: The climate characteristics of areas with hot summers and cold winters are muggy summers, the average regional temperature in July is 25-30°C, and the number of days with annual average daily temperatures above 25°C is 40-100; winters are wet and cold, The average temperature in January is 0-10℃, and the number of days with the annual average temperature below 5℃ is 0-90. The daily temperature range is small, the annual rainfall is large, and the sunshine is relatively small. The climate characteristics of these areas are very suitable for the application of air source heat pumps.
(2) For most of Yunnan, Guizhou, southwestern Sichuan, and a small part of southern Tibet: the average January temperature in these areas is 1-13°C, and the number of days with the annual average daily temperature less than 5°C is 0-90. Under such climatic conditions, in the past, buildings generally did not have heating equipment. However, in recent years, with the development of modern buildings and the move towards a well-off living standard, people have become increasingly demanding on the built environment for living and working. Therefore, modern buildings and high-end apartments and other buildings in these areas have begun to install heating systems. Therefore, in this climate condition, it is very suitable to choose an air source heat pump system.
(3) Traditional air source heat pump units can operate safely and reliably when the outdoor air temperature is higher than -3°C. Therefore, the application scope of air source heat pump units has already expanded from the Yangtze River Basin to the north of the Yellow River Basin, that is, it has entered some areas in Zone II of the climate zoning standards. The climate characteristics of these areas are low temperatures in winter, with the average temperature in January being -10-0°C. However, during the heating period, a large proportion of the hours have temperatures above -3°C, while those with temperatures below -3°C Most of the time occurs at night. Therefore, it is feasible and reliable to use air source heat pumps in buildings that mainly operate during the day in these areas (such as office buildings, shopping malls, banks, etc.). In addition, the climate in these areas is dry in winter, and the relative outdoor humidity in the coldest month is around 45%-65%. Therefore, if you choose an air source heat pump, the frosting phenomenon will not be too serious.