低温海水工况下海水源热泵空调的特性研究

发布时间：2018-04-25 23:05

本文选题：海水 + 热泵　；参考：《天津科技大学》2013年硕士论文

【摘要】：海水源热泵空调具有高效、节能、环保等诸多优点,已被国内外许多沿海城市所采用,是国家“十二五”规划重点推广的能源项目。然而海水源热泵空调的推广却面临诸多障碍,其中就包括在冬季低温海水工况下无法稳定高效运行的问题,针对这一难题,本文对低温海水工况下海水源热泵空调的运行性能进行了研究。首先,对套管式换热器和喷淋竖板式换热器进行了结构介绍和性能分析,分别对二者的传热过程建立了数学模型,并通过求解数学模型,得到其作为海水源热泵中间换热器时海水入口温度、海水流速等关键参数对其流动性能和传热性能,以及对整个热泵系统制热系数(COP)和制热量的影响,并分析了造成这些影响和规律的原因。其次,分别对两种换热器在结冰时的传热过程进行分析,建立数学模型并求解,得到其在结冰时的特性规律：套管式换热器存在结冰堵塞流道,使换热无法继续进行,进而使热泵机组停机,甚至有损坏设备的危险；而喷淋板式换热器可以带冰连续工作,但其在冰层厚度达到一定程度后,传热性能会急剧下降。同时,定义了套管式换热器冰堵率的概念,给出其可以安全运行的工况范围；定义了喷淋板式换热器热阻占比率的概念,给出其可以高效稳定运行的工况范围,并提出了除冰融冰的方案建议。最后,搭建了低温海水工况下海水源热泵中间换热器性能测试实验台,分别对套管式换热器和喷淋板式换热器的传热性能,以及对热泵系统制热系数(COP)和制热量的影响进行了测试,验证了数学模型的可靠性。
[Abstract]:Sea water source heat pump air conditioning has many advantages, such as high efficiency, energy saving, environmental protection and so on. It has been adopted by many coastal cities at home and abroad. However, the promotion of sea water source heat pump air conditioning is faced with many obstacles, including the problem that it can not operate stably and efficiently under low temperature and seawater conditions in winter. In this paper, the operating performance of sea water heat pump air conditioning under low temperature sea water condition is studied. Firstly, the structure and performance of casing heat exchanger and spray vertical plate heat exchanger are introduced, and the mathematical models of heat transfer process are established, and the mathematical model is solved. The influence of the key parameters such as seawater inlet temperature, sea water velocity and other key parameters on the fluidity and heat transfer performance, as well as the heat production coefficient and heating capacity of the whole heat pump system, are obtained when it is used as an intermediate heat exchanger of the sea water source heat pump. The causes of these effects and laws are analyzed. Secondly, the heat transfer process of the two kinds of heat exchangers during icing is analyzed, the mathematical model is established and solved, and the characteristics of the two kinds of heat exchangers are obtained. Then the heat pump unit is shut down, even the equipment is damaged, and the spray plate heat exchanger can work continuously with ice, but when the ice thickness reaches a certain degree, the heat transfer performance will decline sharply. At the same time, the concept of ice plugging rate of casing heat exchanger is defined, and the operating condition range of safe operation is given, and the concept of thermal resistance ratio of sprinkler plate heat exchanger is defined, and the working condition range that can operate efficiently and stably is given. The proposal of deicing and melting is put forward. Finally, an experimental platform for testing the performance of an intermediate heat exchanger of a sea water source heat pump under low temperature sea water condition is built, and the heat transfer performance of the casing heat exchanger and the spray plate heat exchanger are respectively studied. The influence of the heating coefficient and heating capacity on the heat pump system is tested, and the reliability of the mathematical model is verified.
【学位授予单位】：天津科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU831

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