| Ground source heat pump(GSHP),the use of shallow geothermal energy for heating, only need to input a small amount of high-grade energy such as electricity, the low grade heat energy can be towards the high grade heat transfer. It through the exchange of hot and cold between water and geothermal energy can serve as cold and heat source. Ground source temperature is constant, the soil in the constant and increasing zone of subsurface temperature fluctuation is small, usually under 10 m soil temperature close to the average atmospheric temperature. Therefore, compared with the air source heat pump, ground source heat pump can provide higher evaporation temperature in winter, provide lower condensation temperature in the summer.Ground source heat pump in our country start soon, the value technology aspects of system design specifications is not sound. For example, the ground source heat pump system specification, just give a scope, most actual ground source heat pump companies in the design only through design experience and site size and prevent drilling hole spacing.In this paper, through the study of soil tongzhou district of Beijing laboratory drilling thermal physical properties and change law of ground temperature field, and to optimize the design of the ground source heat pump system. Put forward to determine the best method of space as well as the best intermittent operation time. On the one hand is obtained by thermal physical property test of thermal physical parameters design of spacing, on the other hand, by the reaction of geothermal field directly buried temperature changes so as to confirm the best hole spacing. The change rule of ground temperature field for observation, found that the temperature field in the case of continuous operation, the law of the soil temperature is close to the quadratic polynomial. if run continuously for a long time, the soil temperature will change rapidly after early stage of small scope change. |
PDF Full Text Request