太阳能与直燃机联合制冷系统热力学分析与优化研究

发布时间：2019-06-24 12:57

【摘要】：目前在我国建筑供热制冷空调系统中直燃机是应用形式之一,其应用较为广泛,尤其是在城市中。太阳能是可再生能源,其分布广泛且应用潜力巨大。虽然现在太阳能吸收式制冷技术越来越受到重视,但是因其存在连接形式及设备匹配等研究问题而实际应用不多,特别是太阳能与直燃机的联合应用。本论文就针对太阳能与直燃机联合制冷系统进行了研究。在以热力学分析为主而传热学及经济性分析为辅的基础上,利用TRNSYS与e QUEST逐时能耗模拟软件构建了太阳能与直燃机联合系统的模型,模拟并分析出影响该系统效率的主要因素,通过对主要因素的单因素敏感性分析及正交试验设计进行优化,最终得出了太阳能与直燃机联合制冷系统在典型夏热冬冷地区(长沙市)夏季运行时的最佳组合工况,从而为建筑节能设计者、设备制造商及消费者提供参考价值。首先,通过查阅大量的相关参考文献,对太阳能与直燃机联合系统的形式进行了研究并最终确定了系统的主要部件及其连接运行方式。在此基础上,对该系统进行了能量分析,初步得出了影响太阳能与直燃机联合系统效率的主要因素。其次,利用TRNSYS与eQUEST逐时能耗模拟软件构建了太阳能与直燃机联合系统的模型并进行了模拟分析。运用单因素敏感性分析法计算出了三个影响系统效率因素的影响程度与敏感程度。最后,根据影响因素个数及取值设计了正交试验方案,进行了25次模拟,以最少的试验次数获得了合理的试验数据,从而最终实现系统运行优化。本文研究的特色在于联合使用建筑能耗模拟软件TRNSYS与eQUEST构建该系统模型,更加准确的模拟并优化得出在典型夏热冬冷地区(长沙市,室外干球温度为35.8℃、湿球温度为27.7℃、相对湿度为75%)夏季供冷时的最佳运行组合工况,即热源温度为85℃、冷却水温度为30℃、冷冻水温度为13℃。在一定程度上,这个数据的得到对该地方及类似地区夏季供冷时利用太阳能与直燃机联合制冷系统的运行优化起到了指导作用。
[Abstract]:At present, direct gas turbine is one of the application forms in building heating, refrigeration and air conditioning system in our country, and it is widely used, especially in cities. Solar energy is a renewable energy, which is widely distributed and has great application potential. Although solar absorption refrigeration technology has been paid more and more attention, there are few practical applications because of its connection form and equipment matching, especially the joint application of solar energy and direct gas turbine. In this paper, the combined refrigeration system of solar energy and direct gas turbine is studied. On the basis of thermodynamic analysis and economic analysis, the model of solar energy and direct gas turbine system is constructed by using TRNSYS and e QUEST hourly energy consumption simulation software. The main factors affecting the efficiency of the system are simulated and analyzed. The single factor sensitivity analysis and orthogonal experimental design of the main factors are optimized. Finally, the optimal combined working conditions of solar energy and direct gas turbine combined refrigeration system in summer operation in typical hot summer and cold winter area (Changsha City) are obtained, which can provide reference value for building energy saving designers, equipment manufacturers and consumers. First of all, by consulting a large number of relevant references, the form of the combined system of solar energy and direct gas turbine is studied, and the main components of the system and its connecting operation mode are finally determined. On this basis, the energy analysis of the system is carried out, and the main factors affecting the efficiency of the combined system of solar energy and direct gas turbine are obtained. Secondly, the model of solar energy and direct gas turbine is constructed by using TRNSYS and eQUEST hourly energy consumption simulation software, and the simulation analysis is carried out. The influence degree and sensitivity of three factors affecting the efficiency of the system are calculated by using the single factor sensitivity analysis method. Finally, according to the number and value of influencing factors, the orthogonal test scheme is designed, and 25 simulations are carried out, and the reasonable test data are obtained with the least number of tests, so as to realize the optimization of the operation of the system. The characteristic of this paper is that the system model is constructed by using the building energy consumption simulation software TRNSYS and eQUEST, and the optimal operating conditions are obtained in the typical summer and hot winter area (Changsha, outdoor dry ball temperature is 35.8 鈩，

本文编号：2505075