Recharge Simulation Study For Groundwater Source Heat Pump Greenhouse Systems

Greenhouse is created by man-made environmental conditions that suitable for crop cultivation areas not suitable for crop growing in the open field situation. Although the environmental factors-light, temperature, water, air, soil and nutrients have heavily influenced by various factors outside, there are also many fundamental differences. Meanwhile, greenhouse facilities make Environmental Control possible. At present, we heating large-scale multi-span greenhouse by small and medium coal-fired boilers at home. This will not only result in waste of energy, but also, carbon dioxide, smoke and ash emissions, has brought environmental problems. Therefore, it is necessary to study the new heating technology to instead of coal-fired boilers. Given the economic reasons, it has actual sense of large Greenhouse in the suburban and sightseeing areas. Water source heat pump technology is one of new energy-saving technologies that developed in 20th century 70 years. The COP of water source heat pump will be up to 3.5-4.5.It is known as the most efficient heating and cooling technology in the 21st century. The energy-saving and environmental of water source heat pump, greatly eased the greenhouse dependence on fossil fuels and environmental pollution. In short, the study of Groundwater Source Heat Pump Greenhouse Systems had a certain project practical value and theoretical research value academically.Groundwater source heat pump greenhouse systems—Groundwater source heat pump is used in the greenhouse in a HVAC system project. This dissertation studies a greenhouse in Chaluhe-town Jilin City. The framework of this thesis is arranged as follows:At first, a comprehensive analysis of feasibility including economical, technical and environmental analysis, the key is the economic analysis and the reliability of groundwater recharge technology; Then, we have made engineering design of groundwater source heat pump greenhouse systems; At last, in order to solve the problem of groundwater recharge, we have designed a sandbox to simulate Groundwater recharge, done physical simulation in the laboratory and numerical simulation with Visual MODFLOW.Groundwater simulation test is a means of effective tools and commonly used to characterize and reproduce groundwater system. It can simulate the characteristics of stress response prediction of groundwater system. It can solve ground water resource evaluation under complicated hydrogeological conditions and the exploitation and utilization of groundwater. So this method of groundwater systems to become the most effective and most widely used methods.About Physical simulation, there are power simulation, viscous flow simulation and film simulation. We chose the viscous flow simulation in the sandbox under the test conditions. We not only designed and place the test sandbox, Pumping irrigation wells, Water cycle system, observation hole, but also simulated confined water how to pump and recharge water in fully penetrating well. By analyzing the experimental data, we can draw the following rules:In the testing, pores water pressure in the pumping well gradually decreasing with groundwater pumping; the water pressure of A Confined Aquifer become a funnel by the pumping well for center; After moving period of time, the changes of the water pressure of piezometer tube 1 and piezometer tube 4 were affected by pumping and recharges from fixed head of water,and get great influence by recharges from fixed head of water; Recharge or pumping wells that far away from the area get less impact on piezometric head, recharge water get great influence by the distance between the pumping well and the recharge well; For pumping the head after a period of time to recharge and pumping and return the same time both, the latter easier to recharge.About numerical simulation, we used Visual MODFLOW—the most popular and representative general process simulation software, Three-dimensional simulation of groundwater flow and solute standard visual evaluation software system. The system is R&D by the Canadian Water-loop hydrogeology in the original MODFLOW software based on the application of modern visualization technology developed, and in August 1994 for the first time in the international public offering. Because the solving error, interpolation error, model error, and there are still gaps in describing the presence of computer simulation with the real flow, resulting in this physical test data and numerical simulation is not a good fit. Looking forward to the future development of computer simulation will be reduced as much as possible the three errors above to improve simulation accuracy.Physical simulation and numerical simulation of the fitting, it can provides a scientific test method for Groundwater source heat pump project pre-feasibility analysis, and provide a reliable basis to groundwater source heat pump greenhouse system about groundwater recharge, This simulation test in the groundwater recharge project feasibility study in the promotion, will save the technical feasibility of the project return cost of manpower, material and time.