The Analysis Of Shallow Ground Thermal Capacity Testing And Ground Temperature Accumulation At Olympic Forest Park

Shallow ground thermal capacity is the most important index of ground source heat pump (GSHP) system. Thermal capacity parameters can offer effective reference and data sustainment for the optimum design of borehole heat exchanger (BHE). In this paper which is based on the project of Beijing Geotechnical Institute——"Geothermal Energy Perambulation and Estimation of GSHP System in Olympic Forest Park", In-Situ testing of shallow ground TC has been carried out. The ground conductivity coefficients have been analyzed and simulated by GLD GSHP design software with following conclusions:1) The original earth temperature varies when geological conditions change.a. The deeper the borehole, the higher the average temperature.b. The original earth temperature in sand and scree is lower than that in clay.c. The ground temperature is high when fracture is met.2) Soil conductivity coefficient varies when geological conditions change.a. Density and conductivity of the formation increase in deeper borehole.b. In the same depth, the higher the ground temperature, the lower the conductivity.c. The conductivity is favorable in formation rich in sand and scree.3) Soil conductivity coefficients of In-Situ testing and manual examination.a. The value of In-Situ testing is higher than that of manual examination.b. The deeper the borehole, the bigger the difference is.c. Higher ground temperature and geothermal anomaly reduce the difference.4) Analysis of datum simulation in GLD GSHP design software.a. Sparse disposal of BHE is propitious to heat dispersion.b. Bigger and longer BHE encourages the ground temperature accumulation.c. Original earth temperature has a normal school–like effect on system design.d. BHE and equipment room should be considered synthetically due to the great influence of feed-water temperatures.