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《建筑热能通风空调》2016,(9)
以西安建筑科技大学冶园宾馆为对象,研究空气源热泵在西安地区的应用。首先分析了西安地区的气候特点和空气源热泵系统对环境条件的要求,接着在该建筑夏季和冬季典型日空调稳定运行时,选择有代表性的大厅进行温度、速度以及相对湿度的实测,同时在此基础上进行CFD模拟,结果表明空气源热泵在该地区应用是可行的。针对机组的结霜情况,对冬季室外环境进行了为期一个月的温度和相对湿度监测,数据显示空气源热泵在西安地区冬季运行时是比较可靠的。 相似文献
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空气源热泵冷热水机组冬季运行时,空气侧换热器表面容易结霜,结霜将影响机组的供热能力。结合已有的研究结果,对空气源热泵在冬季制热运行时结霜的因素进行了分析,并介绍了目前常用及正在研究的除霜方法及除霜控制方法。 相似文献
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为研究变频空气源热泵机组的结霜特性及除霜优化,搭建了制冷剂为R410A变频空气源热泵系统实验台。在模拟室内外环境条件下进行了机组结霜特性实验研究,测试了室外环境温度、室外环境相对湿度、进水水温对机组结霜的影响。并对通过改变压缩机除霜过程中压缩机运行频率及膨胀阀开度,测试了变频空气源热泵在不同压缩机运行频率及不同膨胀阀开度下机组除霜时间、机组能量损耗、化霜前后机组出水水温温差的变化差异并分析出变频空气源热泵除霜的最佳除霜频率及开度。 相似文献
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Heating capacity of an air-source heat pump (ASHP) system often decreases due to frost on the air-side heat exchanger (evaporator) when the air temperature drops in winter. If the amount of frost accumulates to a certain value, performance of the system will degrade. Therefore, defrosting mode needs to be operated periodically. In order to solve the above problems, heat transfer enhancement or advanced defrosting methods should be adopted, but all these methods cannot solve the problems mentioned in essence. A novel frost-free air-source heat pump system is proposed, the new system can realize heating which does not need defrost in winter. In this new system, extracting heat process from environment includes two steps: the first one is extracting heat from the environment and then to the solution, the second one is releasing heat to the evaporator from the solution, avoiding frosting on the evaporator surface. A theoretical model is established to analyze the performance of the system. Results indicate that the novel system can operate more efficiently than the conventional air-source heat pump in winter. In addition, the new system does not need to run in defrosting mode periodically. 相似文献
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空气源热泵应用范围北扩的可能性分析及其技术措施述评 总被引:8,自引:2,他引:8
系统地分析了空气源热泵在低温条件下制冷能力下降的原因,探讨了其应用范围北扩的可能性;综述了国内外在改善其低温制热性能方面所采取的技术措施。 相似文献
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基于天津地区气候特征,对太阳能/空气源热泵系统冬季制热性能进行了理论研究与实验测试。测试分为两种模式,一种是单纯的空气源热泵运行模式,另一种是双热源热泵运行的模式,根据测试数据进行了能效对比分析。 相似文献
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A heat pump system with a flash-tank coupled with a scroll compressor is compared with a system with a sub-cooler. The heat pump performance was measured experimentally. The heating capacity of the prototype decreased as the evaporation temperature decreased, but the decrease was much slower than that of a conventional air-source heat pump. The power input varied slightly with the evaporation temperature. The heat pump system with a flash-tank is more efficient than the system with a sub-cooler at low ambient temperatures, so it will be very useful as a small capacity air-source heat pump. 相似文献