The perspective of several design problems of closed-loop ground source heat pump system;

Analysis of heat balance and regional characteristics of ground-coupled heat pump systems;

Geothermal Heat Exchanger is a key component in Ground-Coupled Heat Pump systems,but a length calculation method of convenient,correct and suitable for applications does not exist.

With the development of cities, the lay of underground pipes will replace poles for broadcasting and television wires according to the request from Broadcast & Television General Office,that pipelines should be laid or buried .

An underground unpowered anaerobic reactor (UUAR) for the treatment of rural domestic sewage was studied in this paper, based on the anaerobic biomembrane technology and push-flow theory by using the anaerobic pipeline or baffler reactor full of hollow-sphere fillings.

The protective measure against floating dam-age of underground oil tanks.;