长春地区平板热管式太阳能集热器热水系统应用研究

发布时间：2018-11-15 13:48

【摘要】：本文以应用于长春地区某高校平板热管式太阳能热水系统为研究对象,对该系统的全年运行工况进行实测,并在此基础上模拟计算,以研究此类系统在严寒地区实际应用效果,主要研究工作和结论如下:1.本文首先对热水系统全年运行实时数据(热水系统集热温度、太阳辐照度、集热量等参数)进行了实测,并对所测数据进行了收集、整理与分析:(1)从热水系统集热温度、太阳辐照度、瞬时集热效率、瞬时集热量的角度分析,日变化趋势整体上都为先升高后降低,集热温度在13:00左右达到最大值,太阳辐照度在11:30-12:00达到最大值,瞬时集热效率在10:30-11:00达到最大值,瞬时集热量在11:00-11:30达到最大值;(2)从热水系统月均日总集热量和日均集热效率角度分析,两者数值由9月份的2838kw·h和53%下降到3月份的1811kw·h和39%,从下降幅度可看出,日总集热量受季节变化的影响较大,而日均集热效率与之相比影响较小;(3)从热水系统太阳能保证率的角度分析,该热水系统在全年春夏秋冬四个季节的太阳能保证率分别为38%、85%、68%、23%,在冬春季,热水系统只能供给热用户很少一部分的热量,绝大部分是依靠外界其他的辅助热源补热来满足热用户的热需求;在夏秋季,热水系统只需要外界其他的辅助热源补给少部分热量来满足热用户的热需求。2.以上述实际系统为原型搭建TRNSYS仿真平台,将实际运行数据与模拟数据进行了对比分析,从多个角度验证了仿真平台的正确性及可靠性。应用此仿真平台对集热器的安装倾角进行了设置模拟,模拟给出了热水系统在集热器不同安装倾角下的全年各月集热量和年集热量,从模拟数据分析给出各月最大集热量所对应的集热器安装倾角(按月计的平均角度)和年最大集热量所对应的集热器安装倾角(按年计的平均角度),结果表明,该系统全年使用时集热器安装倾角按纬度设置不尽合理(本系统全年使用时安装倾角设置为45°),而该系统集热器全年使用时的实际最佳安装倾角应为40°,系统全年使用时其集热器安装倾角按月或按季节变角度设置,在理论上最为合理,对此,建议实际中尽可能采用。
[Abstract]:In this paper, a flat heat pipe solar water heating system applied to a university in Changchun area is studied. The actual operating conditions of the system are measured throughout the year, and on the basis of this, the practical application effect of this system in severe cold area is studied. The main research work and conclusions are as follows: 1. In this paper, the real time data of hot water system running all year round (such as collecting temperature, solar irradiance, heat collecting etc.) are measured, and the measured data are collected, sorted and analyzed: (1) the collection temperature of hot water system. Analysis of solar irradiance, instantaneous heat collection efficiency, angle of instantaneous heat collection shows that the diurnal variation trend of solar irradiance increases first and then decreases as a whole, and the collection temperature reaches the maximum at about 13:00, and the solar irradiance reaches the maximum at 11: 30-12: 00. The instantaneous heat collection efficiency reaches the maximum at 10: 30-11: 00, and the instantaneous heat collection reaches the maximum at 11: 00-11: 30. (2) from the point of view of the total daily average heat and the daily average heat efficiency of the hot water system, the values of the two values decreased from 2838kw h and 53% in September to 1811kw h and 39% in March. The total daily heat collection is influenced by the seasonal variation, but the daily average heat collection efficiency is less than that of the daily heat collection efficiency. (3) from the point of view of the solar energy guarantee rate of the hot water system, the solar energy guarantee rate of the hot water system in the four seasons of spring, summer, autumn and winter is 38 and 85 respectively, and in winter and spring, The hot water system can only supply a small part of the heat of the thermal users, most of them rely on other auxiliary heat sources to supplement the heat to meet the thermal needs of the users. In the summer and autumn, the hot water system only needs other auxiliary heat sources to supply a small amount of heat to meet the thermal needs of users. 2. 2. The TRNSYS simulation platform is built on the prototype of the above actual system. The validity and reliability of the simulation platform are verified by comparing the actual operation data with the simulation data. The installation inclination of the collector is simulated by using this simulation platform. The annual heat collection and the annual heat collection of the hot water system under different installation inclination angles of the collector are simulated. Based on the analysis of the simulation data, the installation inclination angle of the collector corresponding to the maximum heat collection in each month (the average angle of the month) and the installation angle of the collector corresponding to the maximum annual heat collection are given. The results show that, When the system is in use all year round, the installation inclination angle of the collector is not reasonable in terms of latitude (the installation inclination angle of the system is set to 45 掳throughout the year), and the actual optimum installation inclination angle of the collector in the whole year of the system shall be 40 掳. When the system is in use throughout the year, the installation inclination of the collector is set monthly or seasonally, which is the most reasonable in theory. Therefore, it is suggested that the system should be used as far as possible in practice.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU822

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