【作者】 董建锴；

【导师】 姜益强；

【作者基本信息】 哈尔滨工业大学 ， 供热、供燃气通风及空调工程， 2008， 硕士

【摘要】 本课题来源于国家自然科学基金项目“空气源热泵除霜系统创新及其机理研究(NO.50606007)”。本文在对空气源热泵除霜机理进行充分研究的基础上,设计空气源热泵除霜新系统的动态实验台,提出了蓄能除霜时系统不同的实验流程。自主设计并建造了双套螺旋铜管的套筒形蓄热器—蓄能除霜系统的重要部件,实现了铜管与相变材料的充分接触。基于相变温度和热容量的考虑,选用CaCl2·6H2O相变材料,并以少量的SrCl2·6H2O和Ba(OH)2作为调节剂,从而消除了过冷和分层现象,保证了蓄放热的及时进行。根据设计的实验流程,在分析选择实验设备、测量仪表、数据采集装置等基础上,成功搭建空气源热泵除霜系统动态实验台;基于对常规除霜和蓄能除霜两种除霜模式时系统的温度、压力、功率、结霜量、除霜量、过程变化时间等除霜参数的测定、整理与分析,研究了蓄能热气除霜系统运行动态特性(尤其是除霜换向时,压力温度的变化)、系统恢复制热响应特性及除霜对室内环境的影响;得到了系统各部件在常规除霜与蓄能除霜时的特性变化规律;分析了不同的蓄热模式、除霜的模式下系统的能耗以及对室内温度和供热量的影响。结果表明:蓄能除霜时可以很好的提高吸气压力、缩短除霜时间、提高室内送风舒适度、改善除霜效果等。此外,通过实验还发现了蓄能换热器、高压贮液器、气液分离器在除霜过程中的作用机理与耦合关系及制冷剂迁移规律,据此对实验台提出了改进建议。为进一步开发高可靠性空气源热泵提供了理论支持和技术储备。本文最后对除霜实验中直接测量和间接测量的参数进行了详尽的误差分析,结果表明:实验结果的误差可以接受,测试结果满足要求。更多还原

【Abstract】 This subject is supported by the national natural science foundation item“The system innovation and mechanism research of ASHP defrost(NO. 50606007)”.Dynamic test bed of the new ASHP defrost system is designed ,and different experimental processes are provided on the basis of the system research.Sleeve type energy storage tank with double spiral brass that is one of the most important parts is designed by ourselves.The brass tube and the PCM are plenitudinously contact in this energy storage tank. CaCl2·6H2O is chosen to be the Phase change material based on consideration of phase change temprature and heat capacity. In addition, a few of SrCl2·6H2O and Ba(OH)2 are chosen to avoid the overcolding and Stratification.According to the design of the trial process,dynamic test bed of the new ASHP defrost system is designed on the basic of Choice of test equipment, measurement meter and data Acquisition Device. On the basic of measuring data processing and analysing of the system temperature, pressure, power, frost quantity,defrost quantity and Changes in the course of time , Dynamic Characteristics of the ASHP energy storage system, respone of system heating resume and the defrosting on the impact of indoor environment are researched.System components characteristic change rule between conventional defrost and energy storage defrost are getten. Energy consumption and the impact to the indoor temperature and heating capacity in defferent enengy storage and defrsot mode are analysised. The results show that suction press is risen ,defrost time is shorten, air Supply comfort is improved, defrosting result is improved in the mean of energy storage defrost. Furthermore, Coupled with the mechanism of relations of the energy storage tank, high-pressure liquid receiver and gas-liquid separator in the defrost are discovered.so is the refrigerants migration law.Next we give our advice to the text bed alteration. Theoretical support and technical reserves are given to design high reliability of air-source heat pump.Detailed error analysis is given to the direct and indirect measurement of measurement parameters of the defrost experiment. The results show that the results of error can be accepted, test results are Satisfactory.更多还原