低温空气源热泵应用技术研究

发布时间：2018-06-21 14:40

本文选题：空气源热泵 + 低温　；参考：《燕山大学》2013年硕士论文

【摘要】：方兴未艾的空气源热泵技术，依靠把空气作为低温热源的灵活、实用性，在我国许多地区得到了迅猛的发展。但在向华北、东北地区推广的过程中，成熟的普通空气源热泵技术暴露出了一些问题，其中最明显的问题是在低温工况下因压缩比过大导致工质循环量降低和排气温度升高，从而导致指示效率偏低，甚至还出现机组低温保护频繁停机的问题，影响系统制热性能和运行稳定性。为了克服上述弊端，有效扩大空气源热泵的低温应用范围，本文在总结普通空气源热泵技术特点，研究低温影响机理的基础上，提出一种在北方地区实用并具有广阔市场前景的低温空气源热泵制热新技术——过冷型经济器辅助喷气增焓数码涡旋空气源热泵系统（Enhanced Vapor Injection Air Source Heat Pump SystemCoupled with Scroll Compressor and Undercooling Economizer，简称EVIU系统，下同），并联合企业的加工、试验平台，对上述系统进行了技术实施和现场试验。针对一种可应用于南方地区的数码涡旋空气源热泵加冰蓄冷空调模式和一种可应用于北方地区的EVIU系统加毛细管网采暖模式，研究了容量计算方法和工程性价比问题，以求在保证功能品质的基础上达到更好的节能、环保效果。通过系统对比测试，证实了EVIU系统在较低环境温度条件下应用的可行性，与直流变频热泵相比，EVIU系统具有“小功率，大热量，超低温，更稳定”的技术优势。评价EVIU系统的工程应用经济性，对三联供机组在采暖期、生活热水工况和空调制冷工况分别进行了经济评价，并从设计角度探讨了EVIU系统泳池机工程的热量计算和系统设计方法。针对另一种具有竞争力的低温空气源热泵即双级压缩热泵技术，对其制热性能系数及相关技术参数进行了研究。利用实际工程数据分析了其工程应用的技术因素和经济性，为EVIU系统方案提供了技术支持。研究结果证明，EVIU系统方案在保证系统功能满足用户要求的前提下，，无论在全年运行费用，还是在初投资、运行费用方面，都优于其它系统，本文提出的低温空气源热泵方案具有实用价值。
[Abstract]:The emerging air source heat pump technology, relying on the flexibility and practicability of using air as a low temperature heat source, has been developing rapidly in many areas of China. But in the process of popularizing to North China and Northeast China, the mature common air source heat pump technology has exposed some problems, the most obvious problem is that the working fluid circulation quantity decreases and the exhaust temperature rises at low temperature because the compression ratio is too large. This leads to the low efficiency of indication and even the frequent shutdown of the low temperature protection of the unit, which affects the heating performance and operation stability of the system. In order to overcome the above disadvantages and effectively expand the low temperature application range of air source heat pump, this paper summarizes the technical characteristics of ordinary air source heat pump, and studies the mechanism of low temperature influence. A new heating technology of low temperature air source heat pump with wide market prospect in the north of China is presented. It is an enhanced Vapor injection Air Source Heat pump coupled with Scroll Compressor and, which is assisted by a supercooled economizer for the enthalpy increasing enthalpy digital vortex air source heat pump system. Undercooling economy, or EVIU, The technical implementation and field test of the above system are carried out on the processing and test platform of the joint enterprise. Aiming at a digital vortex air source heat pump with ice storage air conditioning mode and an EVIU system with capillary net heating mode in the north region, the capacity calculation method and the engineering performance-price ratio are studied. In order to ensure the functional quality on the basis of better energy-saving, environmental protection effect. The feasibility of EVIU system in low ambient temperature is proved by system comparison test. Compared with DC frequency conversion heat pump, EVIU system has the technical advantages of "small power, large heat, ultra-low temperature, more stable". To evaluate the engineering application economy of EVIU system, the economic evaluation of triple supply unit in heating period, domestic hot water condition and air conditioning and refrigeration condition were carried out respectively. From the point of view of design, the heat calculation and system design method of EVIU swimming pool machine are discussed. Aiming at another competitive low temperature air source heat pump, two stage compression heat pump technology, the heating performance coefficient and related technical parameters are studied. The technical factors and economy of its engineering application are analyzed by using the actual engineering data, which provides technical support for the EVIU system scheme. The research results show that the EVIU system scheme is superior to other systems in terms of operating cost, initial investment and operation cost, while ensuring that the system functions meet the requirements of users. The low-temperature air source heat pump proposed in this paper has practical value.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU83

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