Underground Heat Exchanger Form And System Operation Mode Optimization Of The Integrated Soil Cool Thermal Storage And Ground-Coupled Heat Pump System

Integrated soil cool thermal storage and ground-couple heat pump system utilizes geothermal energy as heat source, having the advantage of energy saving and environment protection as the ground-coupled heat pump system (GCHPS). Besides, the system leads into the cool accumulation technique, using the electric power during nighttime (off-peak period) to storage cool thermal energy which can be drew out to satisfy the air conditioning load requirement during daytime(on-peak period) and achieves the goal of lighten the tension of the power supply and balance the on and off-peak electric load of the power grid. The integrated system is a new form of air conditioning adapted to the areas where cooling load is primary. The integrated soil cool thermal storage and ground-couple heat pump system is an organic whole of the ice storage technique and GCHPS, and will be a new technique satisfied the need of sustainable development for 21st century air conditioning technique.Based on the energy balance equations, the mathematic model for the inner and outer pipe in the vertical U tube bundles under heat extracting operation condition in winter is established. Based on the simulation, the factors which influence on the operation performances of pipe, such as pipe distance, fluid mass, temperature of inlet water, initial temperature of soil, pipe depth, pipe material, soil parameters etc are analyzed. It supplies theory support and technology accumulation for the optimal design of the underground heat exchanger and the system operation mode optimization.Considered the pipe distance's influence on the cool thermal charging and discharging operation performance and heat extracting operation performance, analyze the heat transfer performance of several pipe collocation forms and their application areas. Give the way of pipe linking under different pipe collocation forms. It supplies technology accumulation for the optimal design of the underground heat exchanger in project design.Analyze the intermittent operation influence on the soil temperature field distribution and heat extraction performance in winter operation condition. Research the influence of the GCHPS refrigeration operation mode on the ground...