小型地源热泵阶梯可调毛细管性能研究

发布时间：2019-04-03 09:35

【摘要】：在建筑能耗中,暖通空调的耗能比例最大,是节能的焦点。地源热泵技术具有高效节能、环保清洁、舒适低噪的优点,得到了快速的发展。目前我国地源热泵技术主要应用于大中型城市,北方农村地区应用较少,这些地区仍然使用燃煤炉子取暖,能源利用率低,环境污染严重,因此政府出台各种惠民政策,改变农村燃煤取暖的方式,应用于农村地区的小型地源热泵技术正在我国兴起。本文以2匹小型地源热泵为研究对象,开发了一种应用于小型地源热泵的阶梯可调毛细管组件,克服了现有小型空调机组出厂后毛细管固定不变,导致机组在非设计工况下工作效率低的缺点,实现了毛细管在不同工况下可调。通过对典型地区地源模型的FLUENT数值模拟,确定典型地区的设计工况,分析这些地区小型地源热泵设计工况下的最佳匹配参数。通过计算机编程计算,确定了不同工况下毛细管的结构尺寸,通过对毛细管进行串、并联的优化组合,完成了毛细管组件样品,该毛细管组件可以实现小型地源热泵在不同工况下的性能最优。最后搭建了小型地源热泵试验台,对采用毛细管组件的小型地源热泵在不同工况下的性能进行了测试和对比。结果表明在相同工况下采用阶梯毛细管组件比单根毛细管的机组效率最高可提高15%,节能效果明显。
[Abstract]:In the building energy consumption, heating, ventilation and air conditioning energy consumption ratio is the largest, is the focus of energy conservation. Ground source heat pump (GSHP) technology has been developed rapidly because of its advantages of high efficiency and energy saving, clean environment protection, comfortable and low noise. At present, the ground-source heat pump technology is mainly used in large and medium-sized cities in China, and less in the northern rural areas. These areas still use coal-fired stoves for heating, energy efficiency is low, and environmental pollution is serious. Therefore, the government has issued various policies to benefit the people. Small-scale ground-source heat pump (GSHP) applied in rural areas is emerging in China by changing the way of coal-fired heating in rural areas. In this paper, two small ground source heat pumps are studied, and a step adjustable capillary assembly for small ground source heat pumps is developed, which overcomes the fixed capillaries fixed after leaving the factory of the existing small air conditioning units. The unit has the disadvantage of low working efficiency under non-design conditions, and the capillary tube can be adjusted under different working conditions. Through the FLUENT numerical simulation of the ground source model in the typical area, the design conditions of the typical area are determined, and the optimum matching parameters under the design condition of the small ground source heat pump in these areas are analyzed. Through computer programming calculation, the structure size of capillary tube under different working conditions was determined, and the sample of capillary module was completed by optimizing the combination of series and parallel connection of capillary tube. The capillary module can achieve the optimal performance of small-scale ground source heat pump under different operating conditions. Finally, a small-scale ground-source heat pump test-bed is built, and the performance of the small-scale ground-source heat pump with capillary assembly under different operating conditions is tested and compared. The results show that the efficiency of the unit with step capillary assembly is up to 15% higher than that of single capillary tube under the same working condition, and the energy saving effect is obvious.
【学位授予单位】：河北科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU83

【参考文献】