Application Of Infiltration Intake Technology In Seawater Source Heat Pump System

Sea water temperature is a key parameter for seawater source heat pump system. The Tianjin coastal zone is of typical silty coast features. The sea water near the coast is shallow and its temperature is low in winter, which make the seawater unfit to be directly used as heat source or sink for heat pump system. Application of beachwell intake technology helps to solve these problems.Based on the application of beachwell infiltration intake technology in seawater source heat pump system, two aspects will be studied, including experimental and theoretical researches on seepage and heat transfer characteristics of fully penetrating beachwell infiltration intake system in confined aquifer. Pumping tests are conducted on beachwell infiltration intake system on site. Based on the experimental results, heat transfer performance between sea water and soil in the course of seepage and some hydrogeological parameters can be obtained. These results provide data information not only for establishing theoretical model but also verifying the model. Based on the heat transfer and seepage theory of porous medium and the built-up test system, physical and mathematical model is set up and solved by using Fluent code to study on the seepage field and temperature field in the course of seawater flowing through the aquifer, which builds the basis for further investigations on the characteristics of seepage and heat transfer. Based on the verified theoretical model, simulations are conducted with changing single condition of the theoretical model for further investigations on its characteristics of seepage and heat transfer and providing optimization proposals of this system. In the end, the beachwell infiltration intake technology is applied in a seawater source heat pump project. An optimized intake system for this project is designed and the supplied water temperatures in winter and summer are predicted. Then economic analysis is made on this heat source/sink, which provides design reference for other similar projects.The results show that the beachwell infiltration intake system can provide higher temperature heat source in winter or lower temperature heat sink in summer for seawater source heat pump system, which ensures more effective and reliable operation of heat pump system than directly intake system. Optimizing the beachwell intake system, the composite costs can be lower. Additionally, water quality of beachwell infiltration system is better than surface sea water. Marine organism adherence prevention can not be used and sand removing can be reduced, which help to lower the seawater pretreatment costs. In environmental impact aspect, beachwell intake system is also better than direct intake system.