岳阳某工程地源热泵空调系统相关问题研究

发布时间：2018-07-08 20:56

本文选题：建筑节能 + 地源热泵　；参考：《湖南大学》2015年硕士论文

【摘要】：随着我国城市化进程的加快,每年新增建筑面积约18亿~20亿m2,预计到2020年底,我国新增建筑面积将达到300亿m2。如此大规模的新增建筑,建筑能耗无疑也是巨大的。目前我国建筑业与工业、交通一起被列为重点节能行业,并且建筑将超越工业、交通等其他行业居于社会能源消耗的首位,因此建筑节能也日益重要。而地源热泵技术的应用对缓解建筑能耗具有重大意义。地源热泵在我国已经有一定的使用规模,但是在地源热泵系统设计和运行过程中仍然存在一些问题值得设计人员注意。本文结合岳阳市宏润家园的空调与卫生热水工程,对地源热泵系统设计过程中的一些问题做以下研究:1.对于大型住宅建筑在负荷计算时,由于空调使用的不确定性大,有必要考虑同时使用系数。在埋管总长度的计算上,规范中理论计算得到的结果与通过土壤性测试后计算得到的结果有一定的误差,因此对于大型的地源热泵系统做土壤热物性测试很有必要。就地源热泵系统的埋管深度建立数学模型,得出在单位井深换热量和地埋管侧进出水温差一定,埋管深度必须大于一定的数值时才能满足规范规定的地埋管内的最低流速要求。另外在广大夏热冬冷地区,通常夏季的冷负荷远大于冬季的热负荷,为平衡土壤的冷热量采用冷却塔辅助散热。对于本文负荷较大的建筑,在部分负荷及满负荷状态下就地源热泵机组和冷却塔的运行控制提出了一种高效可行的控制策略。2.在生活热水系统的选择上,设计了太阳能热水与地源热泵热水相结合热水供应方式。对于生活热水热泵机组与空调热泵机组联合运行时,夏季生活热水机组从土壤中取热,而空调机组则向土壤中释热。本文对这种复合式地源热泵系统的夏季运行提出两种运行策略,并分析了这两种运行策略的可靠性。从而得出在这两种运行策略下,系统的效率都有所提高。3.对目前太阳能系统中常用的分层蓄热水箱进行介绍和分析。通过分析得出分层蓄热水箱具有启动快、加热循环周期长、效率高等优点。对于集中热水供应系统的建筑建议采用分层蓄热水箱,这将为建筑节省相当可观的热水能耗。
[Abstract]:With the acceleration of urbanization in our country, the new building area is about 1.8 billion ~ 2 billion m2 per year. It is estimated that by the end of 2020, the new building area will reach 30 billion m2. Such a large scale of new buildings, building energy consumption is undoubtedly huge. At present, the construction industry, industry and transportation in our country are listed as the key energy saving industries together, and the construction will surpass the industry, and the traffic and other industries will occupy the first place in the social energy consumption, so the building energy saving is becoming more and more important. The application of ground source heat pump technology is of great significance to alleviate building energy consumption. Ground-source heat pump (GSHP) has been used on a certain scale in China, but there are still some problems in the design and operation of GSHP system. In this paper, combined with the air conditioning and sanitary hot water engineering of Hongrun Home in Yueyang City, some problems in the design of ground-source heat pump system are studied as follows: 1. For large residential buildings, it is necessary to consider the coefficient of simultaneous use due to the uncertainty of the use of air conditioning in load calculation. In the calculation of the total length of buried pipe, the results obtained by the theoretical calculation in the code have some errors compared with the results obtained after the soil test. Therefore, it is necessary for the large-scale ground-source heat pump system to test the soil thermal properties. The mathematical model of buried pipe depth of local source heat pump system is established. It is concluded that when the heat exchange in the unit well depth and the temperature difference between the inlet and outlet water on the side of the buried pipe are constant, the buried pipe depth must be greater than a certain value to meet the minimum velocity requirement in the underground pipe specified in the code. In addition, in the hot summer and cold winter areas, the cooling load in summer is much larger than the heat load in winter, and cooling tower is used to balance the cooling heat of soil. An efficient and feasible control strategy of local source heat pump unit and cooling tower under partial load and full load condition is proposed for the buildings with large loads in this paper. In the choice of the domestic hot water system, the hot water supply mode of the combination of solar hot water and ground source heat pump hot water is designed. For the combined operation of domestic hot water heat pump unit and air conditioning heat pump unit, the domestic hot water unit takes heat from the soil in summer, while the air conditioning unit releases heat into the soil. This paper presents two operational strategies for the summer operation of this hybrid ground-source heat pump system and analyzes their reliability. Thus, under these two strategies, the efficiency of the system has been improved. 3. 3. This paper introduces and analyzes the stratified storage water tank commonly used in solar energy system. The results show that the stratified storage tank has the advantages of fast starting, long cycle and high efficiency. For the building of centralized hot water supply system, stratified water storage tank is recommended, which will save considerable energy consumption of hot water for the building.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU83

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