EXPERIMENTAL STUDY OF PARTICLES CLOGGING IN GROUND SOURCE HEAT PUMP
ZHAO Jun1，2，LIU Quansheng1，ZHANG Chengyuan1
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Gansu Provincial Transportation Planning，Survey and Design Institute Co.，Ltd.，
Lanzhou，Gansu 730030，China)
Abstract：With the physical jam phenomenon in water source heat pump injection process as research object，the transportation and deposition processes of suspension particles in porous media are simulated by the self-development sand clogging equipment. In the test，the glass bead particle and gravel particle are taken as the porous media and the alumina is taken as the suspension particle. The flow velocity is controlled from 20 to 200 cm/min. The relationships between water pressure and flow velocity when suspension particles are subsided in glass bead and gravel particles are studied respectively. And the depositional mechanisms for the two different media are analyzed. At the same time，the relationships between relative permeability and time under the conditions of same velocity and different concentrations of suspended particles in glass bead medium are researched. In the end，the permeability coefficient attenuation model is given and it is effective to predict the decrease of permeability coefficient.
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2012, Vol. 31 
