| Based on the study of a variety of ground source heat pump on the basis o f the analysis for the well filled with gravel groundwater source heat pump system is a theoretical and practical test. In this paper, SCW groundwater source heat pump system, which is an energy efficient geothermal energy collection system, there are currently a total of three application forms, namely with pumping irrigation wells, wells filled with gravel, recycling single well. They are the pumping and return pipes placed in the same well, drawing water from the lower portion of the well, the upper backwater. This paper selects the form filling wells with gravel carry out the relevant tests of theoretical and experimental research work, filled with gravel as well SCW groundwater heat pump system heat transfer member, plays an important role in the whole air conditioning system, irrigation and back heat circumstances surrounding soil and gravel between mixed case back to the irrigation and groundwater directly affect the overall performance of gravel to fill the well with underground water source heat pump system. Drilling depth of single well, borehole individual wells, groundwater and so directly determines the initial investment in the system.In order to study the well filled with gravel heat exchanger heat transfer area in Mianyang performance and economy, while a variety of ground source heat pump and heat exchanger were analyzed to study its own advantages and some of the problems that exist. In this paper, the actual construction of Mianyang City Jin Jialin software parks, collecting two single w ell data in different directions, firstly the data collection instrument, thermocouple temperature sensor to collect the original single well; then start the test with heat pump units, recording each probe points temperature changes, and ultimately stabilize the situation by adjusting the flow switch, test the temperature of each point of the changes under different circulation flow rate; and ultimately to the computer automatically saves the recording by the data logger transmission. After final processing and analysis of experimental data obtained, the actual amount of heat exchange with gravel to fill the well of the heat exchanger in the area.Finally, the experimental test data obtained with the ground source heat pump heat exchanger in Mianyang res earch data were analyzed. From the amount of heat exchange, the initial investment project can be considered utilization of land resources, the region is recommended to fill the well with gravel heat exchanger.The results show that: fill wells with gr avel Heat Exchanger performance is superior to the ground heat exchanger performance, and low initial investment, low operation and maintenance management more difficult. Among them, the ground source heat pump single well(100m) heat transfer 8.5kw, fille d with gravel single well(35m) heat transfer 50kw; single-well ground source heat pump circulating water flow 1.5 ~ 3.5m 3 / h, with gravel fill wells circulating water flow 8 ~ 14m3 / h; ground source heat pump unit depth cost 80 to 100 yuan / m(per square meter cost 112 ~ 171 yuan) filled gravel with well unit depth cost from 1000 to 1200 yuan / m(per square meter costs from 84 to 109 yuan). In Mianyang, well filled with gravel flow heat exchanger selection cycles 10 ~ 12m3 / h, drilling depth of 30 ~ 40 m, diameter gravel simultaneously selected conditions of 10 to 30 mm to achieve optimum heat transfer performance and economy. |
