小型空气源热泵热水器优化匹配实验研究

发布时间：2018-03-09 16:12

本文选题：空气源热泵热水器　切入点：水箱容量　出处：《西安建筑科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着我国经济的飞速发展和人民生活水平的快速提高，城乡居民对生活热水的需求逐步形成了一个量大面广的热水消费市场，作为一种高效节能装置，，空气源热泵热水器将在国内及国际市场中占据重要的位置。空气源热泵热水器由于其节能环保的优势及其在阶梯电价中“移峰填谷”的作用在生活热水消费市场具有广阔的发展空间。本文对空气源热泵热水器在不同工况下的运行特性做了较为详细和深入的研究。文中对空气源热泵循环各部件建立稳态流动能量方程，讨论了实际热泵循环中一些因素对热泵循环性能的影响，如液体过冷、蒸气过热、压力损失、不凝性气体等对空气源热泵系统的制热系数（COP）、压缩机耗功等的影响；通过对实际工作过程的分析提出了改善空气源热泵系统各部件的运行状态的方法，可提高热泵热水器机组的运行能效，达到机组优化匹配的目的。在理论分析的基础上依靠课题组搭建的空气源热泵热水器实验台对不同工况下机组的优化匹配进行实验研究。用不同的水箱水量与空气源热泵热水器的2.5匹涡旋压缩机进行配比实验，得出了不同的配比关系下涡旋压缩机的吸排气温度、吸排气压力、压缩机耗功和制热系数等的变化情况，通过对实验数据的分析得出了300L水箱容量与2.5匹涡旋压缩机为最佳匹配。研究了具有气液分离器的空气源热泵热水器与没有气液分离器时空气源热泵热水器的性能参数的区别，发现气液分离器具有抑制压缩机吸排气温度和吸排气压力升高的作用，指出在对空气源热泵热水器的实验及模拟研究中应合理考虑气液分离器对机组性能的影响。本文还实验研究了不同蒸发面积对机组各参数及性能的影响，从机组的性能参数及单蒸发器时较低的故障率可知过渡季节时单蒸发器比双蒸发器更利于机组的安全、稳定和高效运行。在风机风速与空气源热泵热水器性能匹配关系的实验研究中，通过调节蒸发器风速研究不同风速对空气源热泵热水器各性能参数的影响，得出夏季运行较低的风速不仅能抑制由于吸排气温度和吸排气压力升高对压缩机的不利影响使压缩机安全稳定的运行，又可以起到5%以上的节能作用。
[Abstract]:With the rapid development of our economy and the rapid improvement of people's living standard, the demand of urban and rural residents for domestic hot water has gradually formed a large amount of hot water consumption market, as a high-efficiency energy-saving device. Air source heat pump water heater will occupy an important position in domestic and international market. Air source heat pump water heater has the advantage of energy saving and environmental protection and its function of "shifting peak and filling valley" in step electricity price in the consumption market of domestic hot water. Has the broad development space. In this paper, the operating characteristics of air-source heat pump water heater under different working conditions are studied in detail and deeply. In this paper, the steady flow energy equation is established for the components of air-source heat pump cycle. The influence of some factors in the actual heat pump cycle on the performance of the heat pump is discussed, such as liquid supercooling, steam overheating, pressure loss, non-condensable gas, etc., which affect the heating coefficient of the air-source heat pump system and the power consumption of the compressor. Through the analysis of the actual working process, the method of improving the operation state of the components of the air source heat pump system is put forward, which can improve the operation efficiency of the heat pump water heater unit and achieve the purpose of optimizing the matching of the unit. On the basis of theoretical analysis, the optimal matching of air source heat pump water heater under different working conditions was studied by using the experimental bench built by the research group. 2.5 vortices of different water tanks and air source heat pump water heaters. The ratio experiment of rotary compressor is carried out, The variations of suction and exhaust temperature, suction pressure, compressor power consumption and heating coefficient of scroll compressor are obtained under different ratios. Through the analysis of the experimental data, it is concluded that the capacity of 300L water tank is the best match with 2.5 scroll compressors. The difference of the performance parameters between the air-source heat pump water heater with gas-liquid separator and the air-source heat pump water heater without the gas-liquid separator is studied. It is found that the gas-liquid separator can restrain the increase of the suction and exhaust temperature and the suction pressure of the compressor. It is pointed out that the influence of gas-liquid separator on unit performance should be reasonably considered in the experimental and simulation study of air-source heat pump water heater. The effects of different evaporation areas on the parameters and performance of the unit are also studied experimentally in this paper. From the performance parameters of the unit and the lower failure rate of the single evaporator, it can be seen that the single evaporator is more safe than the double evaporator in the transition season. Stable and efficient operation. In the experimental study of the matching relationship between fan wind speed and air source heat pump water heater performance, the influence of different wind speed on the performance parameters of air source heat pump water heater is studied by adjusting the evaporator wind speed. It is concluded that the lower wind speed in summer can not only restrain the adverse effects of suction and exhaust temperature and suction pressure on compressor operation, but also play an energy-saving role of more than 5%.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU822

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