A Study on the Ground Coupled Heat Pump System. Part 4. Examinations of Factors of Design about Horizontal Earth Coil Heat Exchangers and Possibility of the Shallow Earth as a Heat Source for Heat Pump by Numerical Analysis.
2) MEI V. C. Horizonal Ground-coil Heat Exchanger Theoretical and Experimental Analysis. Report ORNL/Con-193, UC-95d. (1986)
3) INGERSOL L. R. Theory of the Ground Pipe Heat Source for the Heat Pump. ASHVE Journal Section, Heating, Piping and Air Conditioning. (1948) vol.20, p.119-121.