太阳能化学吸附制冷的数值模拟和实验研究

发布时间：2018-06-13 18:57

本文选题：太阳能 + 吸附式制冷　；参考：《青岛科技大学》2014年硕士论文

【摘要】：太阳能化学吸附式制冷，是绿色清洁能源太阳能作为热源驱动的制冷方式。在环保节能方面是普通制冷方式不具备的优势，但是吸附床内传热传质效果一直不理想，使得制冷时间长、效率低，这是太阳能化学吸附制式制冷没有广泛应用的主要原因。目前国内外对提高制冷效率的研究主要集中在三个方面：吸附工质对传热传质性能的改进、制冷循环方式的研究、吸附床结构的优化。本文所涉及的太阳能化学吸附式制冷采用槽式太阳能集热器为主要的能量来源，吸附工质对采用氯化钙/膨胀石墨为吸附剂、氨为制冷剂。吸附床为自己设计的翅片管式吸附床。本文的主要工作如下：（1）针对氯化钙易结块、膨胀的缺点，采用膨胀石墨和氯化钙混合的方法改善吸附剂的传热传质效果。（2）设计吸附床结构，编写化学反应程序，通过FLUENT模拟吸附床的传热过程，分析吸附床传热的特点、温度上升规律、氨气生成规律，对吸附床进行优化设计。（3）制作吸附床样机，通过实验数据与FLUENT模拟数据的对比，对数值模拟可靠性进行评价（4）对槽式太阳能进行计算模拟分析，通过计算青岛地区太阳能辐射强度，利用FLUENT对集热管进行模拟分析，，得出槽式太阳能的温度分布规律本文对太阳能化学吸附制冷研究提供了一套可行的研究方法，为以后吸附床的设计研究提供了一定的理论依据。
[Abstract]:Solar energy chemisorption refrigeration is a kind of refrigeration method driven by green clean energy solar energy as a heat source. In the aspect of environmental protection and energy saving, it is not an advantage of ordinary refrigeration mode, but the effect of heat and mass transfer in adsorption bed is not ideal all the time, which makes the refrigeration time long and the efficiency low, which is the main reason why solar chemisorption refrigeration is not widely used. At present, the research on improving refrigeration efficiency at home and abroad mainly focuses on three aspects: the improvement of heat and mass transfer performance of adsorption working fluid, the study of refrigeration cycle mode, and the optimization of adsorption bed structure. The main energy source of the solar chemisorption refrigeration in this paper is the trough solar collector. The adsorbed working medium is calcium chloride / expanded graphite as adsorbent and ammonia as refrigerant. The adsorption bed is a finned tube type adsorption bed designed by itself. The main work of this paper is as follows: 1) aiming at the disadvantages of calcium chloride caking and expanding, the method of mixing expanded graphite and calcium chloride to improve the heat and mass transfer effect of adsorbent is adopted. A chemical reaction program was written to simulate the heat transfer process of adsorption bed by fluent. The characteristics of heat transfer of adsorption bed, the law of temperature rise and the law of ammonia formation were analyzed, and the optimum design of adsorption bed was carried out. By comparing the experimental data with fluent simulation data, the reliability of numerical simulation is evaluated. (4) the trough solar energy is simulated and analyzed, and the solar radiation intensity in Qingdao area is calculated. By using fluent to simulate and analyze the collector tube, the temperature distribution law of trough solar energy is obtained. In this paper, a set of feasible research methods for the study of solar energy chemisorption refrigeration are provided. It provides a certain theoretical basis for the design and research of adsorption bed in the future.
【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB61;TK513.1

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