The Research On Ground Source Heat Pump System In Huainan Area

The world's energy supply and demand are constantly changing,and new energy changes are in the ascendant.China is actively adjusting its energy development strategy.Ground-source heat pump system utilizes geothermal energy,which is encouraged by the country and geothermal energy as renewable energy.It is of great significance for optimizing China's energy structure and reducing the energy consumption of building airconditioning systems.It is widely used in engineering with its many advantages.This paper studies the ground source heat pump system in the center of the ground source heat pump laboratory of anhui university of science and technology.Firstly,based on the geological and geothermal conditions of huainan,this paper expounds the great energy of shallow geothermal energy in huainan area and probes into the feasibility of the ground source system in huainan.Through the introduction of the type,principle and characteristics of ground source heat pump system,the air conditioning system with soil source heat pump as the laboratory is determined.Secondly the paper expounds the ground source heat pump system at various stages of construction and testing,it is concluded that the following main contents:(1)ground source heat pump heat exchanger is located in the north building,a total of four Wells,the effective depth of 100 m.In the form of vertical buried pipe in parallel,two single U tubes are connected in parallel with a spacing of 4.5m.Two double U tubes are connected in parallel with a spacing of 5.5m.(2)the machine room adopts a water/ground source heat pump unit of york;Two vertical single-stage centrifugal pumps are used on the user side.The ground source side adopts the pump with the same lift and flow as the user side.Finally analyzing the operational data,we get the following main contents:(1)Through the U-tube temperature sensor,we measured the average temperature of downhole water 17.6 °C.Through the analysis of the operation of the unit,in order to alleviate the phenomenon of underground heat accumulation,I propose the use of ground source heat pump + hot water.(2)through the detection of indoor temperature field,we found that the heating effect of ground source heat pump is ideal in winter.The flow rate of the source side and the side of the unit is basically the same,and the flow sensor has a large range.Unit side and the ground source side import and export water temperature fluctuations in the design of 5 ? scope,errors within a reasonable range.(3)by calculating the COP value of the unit and system during winter heating,we found that there is a large deviation from the rated heating coefficient of the unit.The indoor thermal comfort parameters were measured by JT-IAQ tester,and the indoor optimal heating temperature was 18~19 degrees according to the PMV-PPD curve.