闭式能源塔换热器性能分析及实验研究
发布时间：2019-06-21 13:06
【摘要】：闭式能源塔热泵作为一种新型的热泵形式,在空调领域已经有一些应用并在发展中不断完善,该系统主要是利用了小温差、宽翅片、无霜运行等技术特点,冬季运行时闭式能源塔利用换热器内载流介质与空气进行热质交换,完成低品位能源转化为高品位能源,使能源得到充分利用。闭式能源塔在冬季工况下运行时,主要的换热工具为翅片管换热器,本文通过对株洲市某公共楼冬季工况下运行的闭式能源塔进行数据测量,根据所得参数对闭式能源塔进行(火用)损失及(火用)效率计算,得出闭式能源塔内翅片管换热器的(火用)损失为9.46715KW,(火用)效率为56.49%。结合其他文献数据比较分析得出:减少冷热源温差可以降低换热器的(火用)损失,在闭式能源塔内冷热源的温差控制在3℃~5℃左右可提高能源利用效率。本文利用FLUENT软件对翅片管换热器管外空气流场的、温度场、压力场的分布进行研究,得到的模拟数据与测量数据误差为7.43%,证明数值模拟具有一定的可靠性。本文还对不同风速、不同翅片间距、不同进风温度等工况下翅片管外空气流动进行研究,根据所得到的数据进行拟合公式并与所得曲线图进行分析,得出风速在4.5m/s,翅片间距为4mm及换热在湿工况下进行换热效果较好。闭式能源塔内换热器的研究对于节约能源、降低能耗、提高换热效率提供了有意义的方法及途径。
[Abstract]:As a new type of heat pump, closed energy tower heat pump has been applied in the field of air conditioning and constantly improved in the development. The system mainly makes use of the technical characteristics of small temperature difference, wide finned, frost-free operation and so on. In winter operation, the closed energy tower uses the internal current-carrying medium of the heat exchanger to exchange heat and mass with air to complete the conversion of low-grade energy into high-grade energy, so that the energy can be fully utilized. When the closed energy tower runs in winter, the main heat exchange tool is the finned tube heat exchanger. In this paper, the data of the closed energy tower operating under the winter working condition of a public building in Zhuzhou City are measured. According to the obtained parameters, the exergy loss and exergy efficiency of the closed energy tower are calculated. The exergy loss of the finned tube heat exchanger in the closed energy tower is 9.46715kW, and the exergy efficiency is 56.49%. Combined with the comparative analysis of other literature data, it is concluded that reducing the temperature difference between cold and heat sources can reduce the exergy loss of heat exchanger, and the energy utilization efficiency can be improved by controlling the temperature difference between cold and heat sources in closed energy tower at about 3 鈩，
本文编号：2504099
[Abstract]:As a new type of heat pump, closed energy tower heat pump has been applied in the field of air conditioning and constantly improved in the development. The system mainly makes use of the technical characteristics of small temperature difference, wide finned, frost-free operation and so on. In winter operation, the closed energy tower uses the internal current-carrying medium of the heat exchanger to exchange heat and mass with air to complete the conversion of low-grade energy into high-grade energy, so that the energy can be fully utilized. When the closed energy tower runs in winter, the main heat exchange tool is the finned tube heat exchanger. In this paper, the data of the closed energy tower operating under the winter working condition of a public building in Zhuzhou City are measured. According to the obtained parameters, the exergy loss and exergy efficiency of the closed energy tower are calculated. The exergy loss of the finned tube heat exchanger in the closed energy tower is 9.46715kW, and the exergy efficiency is 56.49%. Combined with the comparative analysis of other literature data, it is concluded that reducing the temperature difference between cold and heat sources can reduce the exergy loss of heat exchanger, and the energy utilization efficiency can be improved by controlling the temperature difference between cold and heat sources in closed energy tower at about 3 鈩，
本文编号：2504099
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