Method of Forecasting Undisturbed Ground Temperature Under Warm Temperate Climates in China

Abstract

Undisturbed ground temperature is an important parameter for geothermal field and ground source heat pump systems. Lots of previous research focus on the characteristics of the geothermal field of basin area which rely on long-term ground temperature monitoring, however, little research has done to warm temperate regions in China. By using measured data obtained from long-term monitoring in seven cities with typical warm temperate climate, two different calculation methods have been developed, each registering a satisfactory degree of 0.98 and 0.96. Results show that undisturbed ground temperature can be forecasted accurately with data on air ambient temperature, sky temperature, wind velocity and solar radiation density on a horizontal surface. What’s more, air ambient temperature is the dominant parameter weighing more than 76%. The simplified correlation which is only a function of the air ambient temperature has a broader application.