Early-warning of soil heat imbalance for ground-source heat pump systems

Presents the method of establishing an early-warning system aiming at probable occurence of soil heat imbalance in operation of ground-source heat pump system in hot summer and cold winter area. Takes soil temperature standard curve as the early-warning index, considering the randomness of weather conditions, works out the standard curves in accord with three kinds of meteorological parameters. Describes the determining method of the early-warning threshold range, and gives the allowable deviation range of soil temperature in different operation periods.