Characteristic Analysis And Experimental Study Of Solar-Ground Source Coupled Heat Pump System

Currently,the pace of social development is growing dramatically,which has an increasing number of requirement on energy.However,the development mode relying on traditional fossil fuels has been eliminated from the trend of today's society.Therefore,it is essential to expand the utilization of clean energy and persist in the strategy of sustainable development.This paper takes this as the starting point to research the utilization of solar and geothermal energy.Simultaneously,expounding the features of solar heat pump and ground source heat pump system respectively as well as combining their own operational advantage to make them to be coupled,which integrate the solar-ground source coupled heat pump system.The paper carries on the following research to it:Firstly,analyzing the specialities of solar energy and calculating the solar radiation,which make it is feasible to deduce the relationships between earth surface and solar energy radiation intensity.To start with heat collecting efficiency equation and to connect with plate flow resistance are conduce to the research of optimizing the heat efficiency on plate heat collector to collect solar energy.In allusion to the condition that is pertain to the solar collector worked at medium-high temperature,the vacuum tube type heat collector can be advised.That apparatus should be analyzed from the dimension of heat collecting material and efficiency factor.Secondly,to research the thermophysical properties on soil from the facets of the thermal conductivity,thermal inertia,thermal diffusivity and hydraulic conductivity.As the same time,to analysis the ingredient of soil and to research the influence of transfering heat between soil and ground heat exchanger are essential.Discussing the merits and disadvantages about several deployed forms of ground heat exchanger to sum up these optimized forms on different soil condition and to research internal and external thermal model of borehole,thermal resistance in pipe respectively.Simultaneous,introducing the solar-ground source coupled heat pump system and analyzing the system operation mode.Finally,a series of experimental studies on the solar-ground-source-coupled heat pump system are carried out.At the same time,the major components of system have been dissected and the experimental platform has been entrenched to analysis the feature of system on various operational states.In addition to,researching system transfer heat to soil in transition season and summarizing the statistics acquired by experimenting are salutary to the comparing of two compensating heat form.From the aspect of operation mode in system,to exert the integrated system and heat pump system alone,respectively.Comparing the models as well as analyzing relevant conclusions of system thermal efficiency through the statistics measured by the thermal couples and flowmeters.