Impact And Regulation Of Pipe Corridor Project In South Canal Section On Water Source Heat Pump Project Of Shengjing Hospital

Although the groundwater source heat pump has its own unique advantages over the traditional energy sources,the change of groundwater environment restricts the operation efficiency of the groundwater source heat pump in pumping and returning Wells.In recent years,with the large-scale construction of urban underground pipe gallery project,the regional groundwater environment has been changed,resulting in the failure of the original groundwater source heat pump pumping and recharge Wells to meet the design requirements.Therefore,it is important to explore the influence law of the pipe gallery project on the regional groundwater source heat pump to ensure the normal operation of the groundwater source heat pump.This paper takes shenyang（south canal section）of urban underground pipe project involves shengjing hospital ward floor underground water source heat pump project as an example,based on the utility tunnel engineering analysis of the influence law of shengjing hospital underground water source heat pump,through the traditional calculation method and the mathematical model is established to shengjing hospital of the regulation scheme evaluation and optimization of the underground water source heat pump,for in the pipe gallery shengjing hospital under the influence of underground water source heat pump engineering planning and rebuilding provides a theoretical and technical basis.The details are as follows:（1）Analysis of hydrogeological conditions in the study area:aquifer thickness 33～40m;Groundwater recharge mainly includes groundwater lateral runoff recharge and meteoric precipitation recharge.The hydraulic gradient is between 0.001 and 0.002;The groundwater level is buried 7～9m deep.Elevation of groundwater level 35～36m;The underground water temperature is 11～12℃,which indicates that the study area is in the suitable area of the underground water source heat pump.（2）Indoor simulation test of the influence of pipe gallery project on water source heat pump:combined with the actual project,the indoor sand box test was used to simulate the influence of different pipe gallery shapes and water flow directions at different included angles on the water temperature and water level of the recharge well.According to the indoor test law of the recirculating water temperature of the pipe corridor project,the influence range of the pipe corridor project on the underground water temperature is 20m calculated by using heat transfer and fluid mechanics.According to the indoor test rule of the pipe corridor engineering for the recharge water level,the permeability coefficient of the pipe corridor engineering under the influence of darcy’s law is equivalent to K₂=0.227 K₁.（3）For the reliability analysis of water source heat pump engineering of shengjing hospital:the reliability of water source heat pump system was quantitatively calculated by using the traditional method to calculate the volume of water output and recharge of a single well and the method of establishing mathematical model.The details are as follows:Based on the calculation of the water consumption of the pumping well and the recharge well,it is found that the maximum water output of the water source heat pump is 264and the maximum water output of the single well of the recharge well is 35.5.According to the different influences of the pipe gallery project on the pumping and recharge Wells,the pumping water volume of a single well under the influence of the pipe gallery project is calculated to be 155and the recharge volume is 28.44.Based on the reliability analysis of water output of water source heat pump based on markov model,the comprehensive reliability of designed water output of water source heat pump system under the influence of pipe gallery project is calculated quantitatively to be 0.6258,which indicates that the water output reliability of shengjing hospital water source heat pump system is relatively low.In order to ensure the normal operation of water source heat pump,3 pumping Wells and7 recharge Wells are proposed.Based on the analysis and calculation of the hydrogeological conditions,the range of the distributed well and the water output of the water source heat pump pumping and recharge well in the project area,the corresponding control scheme is put forward.Through the establishment of markov model,the reliability of the whole water source heat pump system in the control scheme is calculated as 1.0161（excluding the reserve well）,which conforms to the design requirements of 100%water outlet reliability of water source heat pump.When considering the backup well of the water source heat pump,the reliability of the water source heat pump system based on markov model is 1.1063,which conforms to the requirement of 10%～20%surplus of water source heat pump in engineering design.The rationality and feasibility of the regulation plan are proved theoretically.（4）Numerical simulation and prediction of different water source heat pump control schemes in shengjing hospital:the results show that the maximum water level in the two control schemes is 39.9m during the simulation period,while the ground elevation in the project simulation area is 39.65-40.09m,not exceeding the ground elevation;In the water temperature simulation,the temperature around the pumping well is 10～12℃,the lowest temperature of the recharge well is above 5.5℃,and the highest temperature is 17℃,all above 5℃and less than 19℃.Therefore,the two schemes meet the design requirements from the technical point of view.（5）Optimization selection of water source heat pump engineering regulation scheme of shengjing hospital.Based on the analysis of the control factors in the two control schemes of shengjing hospital water source heat pump combined with the engineering practice,the construction cost,technical conditions and management cost are determined as the evaluation indexes of the control scheme selection.According to the selected evaluation index,the entropy weight-fuzzy comprehensive evaluation matrix was established,and according to the calculated evaluation subset results,the maximum membership principle was adopted to determine the optimal scheme in the water source heat pump regulation scheme of shengjing hospital.To sum up,this paper studied the influence of the pipe gallery project on the pumping and recharge Wells of the water source heat pump in shengjing hospital.In order to meet the design requirements of the water source heat pump of shengjing hospital under the influence of the pipe gallery project,two control schemes of the water source heat pump were put forward by analyzing and studying the regional hydrogeological conditions,the law of laboratory test,and the reliability analysis of the water output of pumping and recharge Wells.It provides the research idea and theoretical basis for solving the construction problem of water source heat pump under the influence of practical engineering.