Study The Coupled Unit’s Performance Of The Ground Source Heat Pump And Rain Water Recycle System

The coupled unit is a new form of technological innovation which combined theground source heat pump technology and rainwater harvesting techniques with bothheat transfer and storage capacities. This combined technology breaking through thetraditional thinkingof rainwater storage and utilization which GSHP drilling used as thebasic carrier to accommodate the soaker hose. The treated rainwater would beaccumulated to the different soil depths and types of aquifers with a proper pipestructure design. The GSHP heater transfer performance will have improved to someextent during the stage of water storage. Therefore, studying the combined technology’sperformance of water storage and heat transfer has a clear practical engineering value incontrolling the urban rainfall flood, balancing the ground water volume and optimizingthe GSHP design.The main content of this article is based on the experimental analysis. The articlefirst elaborated the establishment processing of the coupled unit research platform, thenanalysis the characteristics of the water storage and heat transfer process based on theexperiment research. In the analysis of the porous mediumheat and mass transfertheory-based process, the article established a theory equation of unconfined aquiferstorage process, and compared with the experimental storage to verify the correctness ofthe calculation equation. On the basis of the experimental and theoretical analysis, thearticle established a coupled numerical model of heat transfer and water storage process,then analysis the characteristics of the model in different conditions with FLUNTsoftware. Finally, the article provides the framework for engineering applications.Experimental results show that the hydrostatic pressure have different value indifferent depths of the rock layer.The pressure at a depth of-80m is higher4.87m than ata depth of-30m. Two stages exist in the impounding process which is early stage andstability stage. The unit B has the capacity of0.19L/min in the stability stage;theaverage storage capacity is up to0.24L/min when improving the initial pressure inlettube to5m water column. There exist storage marks during the intermittent waterstorage course, the longer the water recovery the water marks smaller.Several factors,seepage-hole diameter, hole-number, vertical distribution of the seepage holes and thepermeability of the rock itself are the key parameters influencing the coupled unit’sstorage capacity. Coupled Unit engineering design should ensure that the seepage flow capacity is larger than the penetration ability of the drill outside medium to maximizethe potential of water storage capacity.Moisture change caused by the GSHP heat is a slower process compared with therecovery stage. After the end of the exhaust heat stage, moisturerecovery process can becompleted in a relatively short period of time. Thermal diffusion capacity in thecoupling period is larger than the single heat process for the increasing proportion ofconvective heat transfer and enlarging the average temperature difference of the heatexchanger to the rock medium. The experiment result of unit-C shows that the heatcapacity could be increased by9.8%in water storage process.Theoretical calculations show that unit-B has the storage capacity of0.155L/min,which below0.19L/min, the stable phase of the experiment process. This is due to theassumption that the theoretical calculations for the shale geological storage,while theactual units arethe composite structure of the original immature soil and mudstone,which owns superior permeability compared to mudstone.