【作者】 黄顺；

【导师】 董建锴；

【作者基本信息】 哈尔滨工业大学 ， 建筑与土木工程（专业学位）， 2017， 硕士

【摘要】 目前,空气源热泵供暖是南方普遍存在的一种供暖方式,并且在大环境与国家政策的支持下,空气源热泵供暖迎来了发展黄金期,但常规空气源热泵供暖普遍存在热舒适性较差的问题。考虑辐射供暖系统拥有较高热舒适性的优点,本文提出一种新型的供暖末端,通过辐射和强制对流换热的方式进行供暖,设计直膨式空气源热泵墙面板供暖系统,并且对其性能进行实验研究。根据常规的辐射供暖末端和空气源热泵空调器末端的设计方法,设计以制冷剂作为热媒的墙面板。对现有的常规空气源热泵空调器的室外机进行改装,搭建直膨式空气源热泵墙面板供暖系统实验台,并进行误差分析,测量数据符合实验精度要求。基于搭建的实验台,开展直膨式空气源热泵墙面板供暖系统供热和除霜实验,研究压缩机吸排压力、墙面板进出风温度、系统制热量、压缩机功率、系统COP等特性参数的变化规律,分析室外环境温度和墙面板的送风量对系统制热性能的影响。此外,研究除霜过程中室内温度、墙面板进出风温度、除霜时间、恢复供暖时间、除霜能效比等特性参数,分析系统除霜性能及系统除霜对室内热环境的影响。实验结果表明:在额定制热工况下,系统COP趋于稳定在2.90~3.02之间,较集中供暖系统节能;随着室外环境温度的升高,系统的制热量和COP随之上升;调节墙面板的送风量可以有效调节辐射换热和强制对流换热比例;相比常规空气源热泵系统,该系统在除霜过程中的除霜时间、对室内热环境的影响以及除霜能效比方面均得到明显的改善。本文的研究工作将为优化设计直膨式空气源热泵墙面板供暖系统和改善常规空气源热泵供暖过程中恶化的室内热环境问题提供有益参考。更多还原

【Abstract】 Air source heat pump heating is a common heating way in the South at present.Moreover,the air source heat pump heating has ushered in the golden age of development with the support of the big environment and national policy.However,the conventional air source heat pump generally has a problem of poor thermal comfort.Considering the advantages of a radiant heating system with higher thermal comfort,a new type of heating end was presented which heated by means of radiation and forced convection heat transfer in this paper.In addition,this article designed a wall panel heating system with direct expansion air source heat pump and experimentally analyzed the operation performance of the system.Based on the design method of conventional radiant heating end and air source heat pump air conditioner end,the radiant panel in wall which used refrigerant as a heat medium was designed in this article.Then,the outdoor unit of the existing conventional air source heat pump air conditioner was refitted and the experimental platform of the wall panel heating system with direct expansion air source heat pump was set up.Moreover,the calculation results of the experimental error showed that the measured data conformed to the requirements of experimental accuracy.Based on the experimental platform built,the heating and defrosting experiments of the wall panel heating system with direct expansion air source heat pump were carried out.The change law of characteristic parameters such as suction and exhaust pressure of the compressor,inlet and outlet temperature of radiant panel,heating capacity,compressor power,COP and so on were studied.Moreover,the influence of outdoor environment temperature and air supply rate of radiant panel on thermal performance of the system were analyzed.In addition,the characteristic parameters such as indoor temperature,inlet and outlet temperature of radiant panel,defrosting duration,resuming heating duration,defrosting energy efficiency ratio and so on were also studied during defrosting process.Besides,the defrosting performance and the influence of defrosting on the indoor thermal environment were analyzed respectively.The experimental results indicated that the COP of the system tended to stabilize between 2.90 and 3.02 under rated heating condition and the wall panel heating system with direct expansion air source heat pump was more efficient compared with the central heating system.Moreover,with the increase of outdoor environment temperature,the heating capacity and the COP of the system increased.Besides,the radiative heat transfer and the forced convection heat transfer ratio could be effectively regulated by adjusting the air supply rate of the radiant panel.In addition,compared with the conventional air source heat pump system,the system had obvious improvement on defrosting time,the influence on indoor thermal environment and defrosting energy efficiency ratio during defrosting process.The research work of this article will provide a useful reference for optimizing the design of the wall panel heating system with direct expansion air source heat pump and improving the deterioration of the indoor thermal environment in the process of heating with conventional air source heat pump.更多还原