太阳能水浴式固体吸附制冷系统设计及性能特性研究
发布时间:2018-06-06 20:39
本文选题:太阳能 + 吸附制冷 ; 参考:《云南师范大学》2016年硕士论文
【摘要】:本文设计和搭建了基于太阳能热水供能的水浴式固体吸附制冷系统,可解决传统平板型翅片管式固体吸附制冷系统存在的以下问题:一、在加热解吸阶段吸附床受热不均匀而导致制冷剂的解吸量较少,二、在冷却吸附阶段吸附床采用自然降温冷却而导致其冷却速率较慢,三、由于太阳辐射的不稳定而导致系统制冷性能变化较大。从系统结构及性能优化等方面,本文开展了以下研究工作:1、从优化系统制冷性能的角度出发,通过理论计算,设计和制作了一种储热与供热一体的翅片管式吸附制冷系统,并完成了系统的搭建及运行调试。2、针对设计的翅片管型太阳能水浴式吸附制冷系统,将翅片同心管吸附床放置于保温水箱中,采用热水浴进行加热解/吸附,通过实验研究了吸附床在维持解吸温度分别为94℃、85℃、75℃及加热至94℃后自然冷却时的温度分布及特点。3、以太阳能热水及电模拟辅助加热作为驱动热源,在解吸阶段对置于保温水箱内的吸附床进行加热,解吸吸附床内的制冷剂。采用实验方法研究了解吸温度和解吸时间对系统制冷性能的影响。结果表明,解吸温度对太阳能水浴式固体吸附式制冷系统的性能具有较大的影响,解吸阶段较高的解吸温度有利于制冷剂的解吸。延长加热解吸时间可以提高系统的日制冰量和直接制冷量,但同时系统散热量也随之增大,维持系统运行条件而由外界输入的能量随之增大,系统循环COP与系统的热利用率下降。系统存在一个较佳的加热解吸时间10h,更长的解吸时间对系统制冷性影响不大。4、通过实验研究了控制传质过程和无传质过程控制时太阳能吸附制冷系统在不同加热解吸时间条件下系统的制冷性能。在加热解吸时间相同的条件下,无传质过程控制系统的制冷性能尤为优越,其平均制冷效率高出20%,其平均日制冰量是控制传质过程系统的1.16倍。5、针对无传质过程控制的系统,采用控制冷凝温度的方法来研究系统的性能。无传质过程控制的太阳能吸附式制冷系统在接收外界输入能量相当的情况下,随着冷凝温度的逐渐降低,系统制冷性能系数逐渐增大。系统的制冷性能受冷凝温度的影响颇大。本文所提出的太阳能水浴式固体吸附制冷系统,在保证冷量稳定输出的同时还可为用户提供一定品质的热能。所得结论为固体吸附制冷技术的进一步研究和实际运用提供了基本理论指导和实验参考,也为多效制冷循环系统的研究提供相关的实验依据。
[Abstract]:In this paper, a water-bath solid adsorption refrigeration system based on solar hot water supply is designed and built, which can solve the following problems in the traditional flat fin tube solid adsorption refrigeration system: 1. The adsorption bed is heated inhomogeneously in the stage of heating and desorption, which results in less desorption of refrigerant. Second, the adsorption bed is cooled by natural cooling in the stage of cooling and desorption, and the cooling rate of adsorption bed is slow. Because of the instability of solar radiation, the refrigeration performance of the system changes greatly. From the aspects of system structure and performance optimization, this paper has carried out the following research work: 1. From the point of view of optimizing the refrigeration performance of the system, through theoretical calculation, a finned tube adsorption refrigeration system integrating heat storage and heat supply is designed and manufactured. And completed the system construction and operation debugging. 2. Aiming at the design of the finned tube type solar water bath adsorption refrigeration system, the finned concentric tube adsorption bed was placed in the heat preservation tank, and the hot water bath was used for the heating desorption / adsorption. The temperature distribution and characteristics of adsorption bed during natural cooling after maintaining desorption temperature of 94 鈩,
本文编号:1988032
本文链接:https://www.wllwen.com/guanlilunwen/gongchengguanli/1988032.html