Development Of An Instrument For Measuring Heat Parameter Of Shallow Ground

Today, ground source heat pump has being thought much of because the fossilenergy nearly had been exhausted. Ground-coupled heat pump has been thought mostimportant form of ground source heat pump because of its characteristic of cleanliness.Heat parameter of shallow ground will make great impact of buried U-tube heatexchange of ground-coupled heat pump. But there still have no special instrument formeasuring the parameter that has been accepted by the entire engineers who engage inground source heat pump. In this thesis, the author mainly does some study on themeasuring instrument.This thesis is on the development of the instrument for measuring heat parameter ofshallow ground. There is also heat transfer model and software for calculatingparameter in the thesis.The instrument simulates dispelling heat of buried U-tube heat exchange, andmeasures the temperature and flux of the water which enters U-tube and come out ofU-tube. It measures temperature and flux by sensor. It can adjust power of heaterstepless by the special booster. It can adjust flux by the special cycle system.The initial temperature of earth used in cylinder wall heat transfer model is estimateby theory and measurement. The calculation of the initial earth temperature ispredigested on the basis of little error. The cylinder wall heat transfer model canaccount the average heat exchange coefficient easily.The software for calculating the parameter of buried U-tube is programmed by VB.It can make calculate easily.The instrument can be used for the U-tube whose depth within 150 meter. And itcan calculate the total heat dispelling power, and the heat dispels power per meter, andthe average heat exchange coefficient.