家用式井下换热制冷空调系统的实验研究--挑战杯.docVIP

家用式井下换热制冷空调 系统的实验研究 The experimental simulation of downhole heat exchanging system in the house 类 别: 自然科学类学术论文作 者: “”团队 摘要 我国中低温对流型地热资源丰富，如能充分开发，则可节省大量的常规能源，缓解经济、社会发展日益增长的能源需求。针对我国地热资源以中低温为主的特点，通过实验与理论研究确定井下换热器制冷过程中各影响要素及其热力学性能，对其应用的实现具有至关重要的作用。 该系统利用地下水的恒温（16℃-19℃）性，使用动力设施将高温水(30℃)从室内引入，通过管道运输到水井中，利用换热器使循环水在井中与井水多次换热后，热量传递至井水和井壁，然后将制得的冷水从井中管道再利用泵导入至室内，可以为室内提供冷量。 本文建立了一套可控制换热器入口温度和循环流速的模拟实验研究系统，通过改变U型管的几何参数和换热器入口温度和流速大小，对与井下换热器热性能相关的多种因素进行对比实验。基于实验数据，分析了井下换热器与热水储层的换热温差、井下换热器管内流速以及换热器系统管几何参数等因素对井下换热器热输出功率和管外换热系数的影响作用。得到了井下换热器的传热实验关联式，此关联式可为形成一整套新型节能、环保、经济可靠的空调系统的设计提供参考指导。 关键词： 井下换热器 冷却 对流换热 实验模拟 Abstract The abundant low-temperature geothermal resources provide China an opportunity to save conventional fossil fuel resources. If fully developed, the growing demand for coal and oil with the economic and social development could be relieved significantly. Downhole Heat Exchanger(DHE) is such a clean method. The keypoint to make an efficient use of DHE depends on both the knowledge of its heat transfer characteristics at given strata conditions and that of its thermodynamic performance. The groundwater with constant temperature (16~19℃)was used in the DHE system to cool the cycling water with higher temperature (30℃)pumped from room. Through the DHE the heat in cycling wagter was transfered to the groundwater and through the well wall to the aquifer. Then, the cooled cycling water was pumped through pipe to cooling the room. This paper present a simulated experiment system in laboratory, which can provide different water temperature and a changeable flow rate. About 40 series of experiments were carried out under various parameter combinations, such as the geometric parameters, working conditions and reservior permeability, etc. The heat output rate and heat transfer coefficient on the outside of U-tube were analized based on these different factors. A heat transfer correlation was presented for DHE based on the analyses of different factors, which can b