Research on Thermal Conductivity of Grouting Material for Underground Heat Exchanger of GSHP System

摘要

As we know, thermal properties of grouting material between the pipe and the stratum is one of the most factor to the efficiency and cost of the ground-source heat pump system. In this paper, based on the research of the grouting material at home and abroad, it was tested with a different ratios of bentonite-sand by steady-state gauges(JTRG-III conductometers with steady state thermal flow). The thesis involves physical characteristic indexs of the testing, such as the density of the bentonite-sand, moisture content, void ratio, saturation and coefficient of thermal conductivity etc, and it will be adjusted to provide reliable basis for the ground-source heat pump technology application.