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Recharge Simulation Study for Groundwater Source Heat Pump Greenhouse Systems

Author: ChengXi
Tutor: WangZuo
School: Jilin Agricultural University
Course: Agricultural Soil and Water Engineering
Keywords: Groundwater source heat pump greenhouse utilization system Recharge Physical simulation Visual MODFLOW numerical simulation
CLC: TU831.3
Type: Master's thesis
Year: 2011
Downloads: 86
Quote: 0
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Abstract

Solar greenhouse is open not suitable for crop growth by artificially create a suitable environmental conditions for crop cultivation place. Environmental factors within this place a light, warm, water, air, soil and nutrient elements is heavily influenced by the outside world the impact of various factors, that is, in many ways the open common, but there are also many fundamental difference, at the same time, greenhouse facilities can also be powerless in the open field production environmental control possible. At present, China's large-scale multi-span greenhouse mainly to small and medium-sized coal-fired boilers as heating equipment. This will not only result in waste of energy due to the emission of carbon dioxide, soot and ash, also brought environmental issues. Therefore, it is necessary to study the large-scale multi-span greenhouse to replace coal-fired boiler heating technology. Taking into account economic factors, more practical significance for the outskirts of the city and sightseeing areas of large multi-span greenhouse. Water source heat pump technology is a new type of energy-saving technologies developed in the 1970s, the use of water source heat pump heating, the heating coefficient of 3.5-4.5, known as the most efficient heating and cooling technology of the 21st century. Water source heat pump energy-saving and environmental protection, greatly easing the solar greenhouse on fossil energy dependence and pollution of the environment, with considerable research and promotion value! Groundwater source heat pump greenhouse using the system - is the groundwater source heat pump used in the greenhouse A set of HVAC systems engineering. Jilin fork town Greenhouse, the test for the study, the first to analyze the feasibility of the system (including the economic analysis, technical analysis, environmental analysis), where the key is the economic analysis and groundwater recharge technology reliability verification; Then, for the greenhouse groundwater source heat pump greenhouse systems engineering design; Finally, in order to solve the problem of groundwater recharge, design sandbox recharge simulation test, the laboratory physical simulation and Visual MODFLOW numerical simulation. The groundwater simulation test characterization, characterization and reproduction of the groundwater system an effective tool and a common means, can simulate the characteristics of the groundwater system and its stress response prediction can solve complex hydrogeological conditions and groundwater exploitation under the conditions of groundwater resource evaluation, has been one of the to study groundwater system is the most effective and most widely used method. Physical simulation, the simulation, the simulation of viscous flow and film simulation. The binding test conditions, the use of viscous flow simulation in the sandbox. Not only to complete the test sandbox, the design and layout of pumping irrigation wells, water recycling systems, observation wells, and were confined water in complete wells pumping and injection process simulation. By analyzing the test data, can be drawn to the following rules: the aquifer during the test each pore water pressure value with the pumping wells the water out of the aquifer is gradually reduced; confined aquifer pumping well head value as the center into a typical funnel-shaped; running for some time, piezometric piezometric head changes by the double impact of changes in pumping and Constant Head boundary head, but more sensitive to changes in the fixed-head boundary head; away from the pumping recharge wells regional piezometric head less affected, the reinjection water flow by pumping wells and recharge wells relative position is very significant; pumping head, over a period of time to recharge and pumping and return at the same time. In comparison, the latter is easier to recharge. Numerical simulation, we use the world's most popular and countries unanimously approved the three-dimensional groundwater flow and solute simulation evaluation standard visualization software system - Visual MODFLOW. The system is by the Canadian Water-loop hydrogeological company on the basis of the original MODFLOW software application of modern visualization techniques developed, and in August 1994 for the first time in the international public offering. The presence of a computer error, interpolation error, model characterizes the error due solving numerical simulation with the real flow there are still gaps, leading to the physical test data and numerical simulation is not a good fit. Look forward to the future development of computer numerical simulation will be possible to reduce the impact of more than three errors on the accuracy. Physical simulation test and numerical simulation fit for groundwater source heat pump project pre-feasibility analysis of scientific simulation test methods for groundwater source heat pump greenhouse use the system recharge feasibility of the technology provides a reliable basis. This simulation test promotion in the groundwater recharge engineering feasibility study, will be significant savings in the backwater project's technical feasibility analysis cost of manpower, material and time.

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