Research On Certain Heat Transfer Issues Of Vertical Buried Tube In Ground Source Heat Pump

In view of the densely-populated national situation,combined with the features of energy-saving,environmental protection,high-efficiency,buried pipe ground source heat pump system has been more and more widely used in recent years.Several problems related to the heat transfer of vertical ground heat exchanger are studied in this paper.In Accordance to the test date in thermal and physical properties of ground-source heat pump(GHSP)in Zhejiang,the method of virtually expanded samples is put forward for minimum sample test.And based on principle of information spread,from the perspective of virtual augmented samples and information theory,and making full use of the virtual samples,the sample information diffusion function would be solved rather than assume it to be a classical probability distribution firstly.Using K test,the normal diffusion function turned out to be true and further proved it was more in line with the real distribution of geotechnical thermal physical parameters.Based on the reliability design method of the GSHP buried pipe,under the certain failure probability,through a numerical example,the quantitative influence of random factors single change to vertical ground heat exchanger length calculation is analyzed,and finally summing up the actual effect and progression of these random factors.According to the actual distribution of the random factors,Monte Carlo simulation method is given to study the change of buried pipe length when the random variables synchronous change,and got a lot of sample lengths through thousands and millions of times simulation,and obtained the probability distribution of pipe length.Combining the example,according to the requirement of the system,and comparing the deterministic design method,the length under different reliability can be calculated.Using TRNSYS to simulate the effects of the heat transfer of GSHP under various factors,and find out the primary and secondary relations and compare it with the theoretical calculation results.