Research On Experiment And Development Of In-situ Portable Testing Equipment Of Shallow Layer Temperature And Thermal Conductivity

By reason of backward technology in geothermal prospecting and unable to detecthydrothermal reservoirs accurately, we have just exploited a fraction of geothermal resourcesalthough we are wealthy. Shallow layer thermometry which is a new method with low cost andhigh efficiency is seldom used in our country for backward technology and lack of portableequipment.According to these practical problems, this paper performed to devise an in-situ portabletesting equipment. The testing equipment could measure the thermal conductivity andtemperature with probe. The probe measures the thermal conductivity and temperature by usingPT1000temperature sensor and resistive heater which controlled by Micro-control systemcircuit. Self-designed data acquisition software which is based on C#under the Windowssystems and applied line heat source heat conduction thermal conductivity calculation method isworking with the testing equipment so that it can calculate, analyze and display the results at anytime by using the Micro-control system circuit and the date we measured. Powered byMicro-gasoline engine, we designed the probe in injection structure. We complete thedevelopment of In-situ portable testing equipment of shallow layer ground temperature andthermal conductivity by the work above, and form a set of equipment with independentintellectual property rights that applied for national invention patents.In this paper, the In-situ portable testing equipment of shallow layer ground temperatureand thermal conductivity is rated by indoor test with the QTM thermal transient tester importedform Japan. The thermal conductivity of clay, silt, fine sand and grit form different places underdifferent moisture conditions are tested with the equipment to determine the technicalparameters and scope of the equipment.Based on the work above, the equipment is used for studying the shallow geothermal andthermal conductivity of the test site in in Xiamen. In order to provide a theoretical basis for thepopularization and application of shallow temperature measurement technology, we study theeffect factors, such as testing time,testing time, depth, background values, environment and soon, on shallow layer thermometry by field investigations, collecting engineering and geological conditions and thermal anomalies of field, and testing temperature and thermal conductivity atthe depth of1meter and2meter.The indoor and outdoor field tests show that the equipment development in this paper isfull-featured, simple structure, fast and accurate measurement, economical and reliable. Shallowlayer thermal conductivity can be measured accurately and efficiently by the instrument at lowcost. The development of the In-situ portable testing equipment of shallow layer temperatureand thermal conductivity is advantageous to the promotion and application of the shallowtemperature measurement technology, which is of great importance to promote national shallowgeothermal energy development and alleviate the pressure of the domestic energy consumption.