某城市污水源热泵区域供热可行性研究

发布时间：2018-12-16 04:59

【摘要】：污水源热泵是一种可再生能源利用技术,它通过热泵技术汲取污水中的热量或冷量,从而为建筑供热或供冷。由于污水源热泵高效节能,因此它的应用在节能减排,低碳城市发展中具有重要意义。由于污水源热泵的性能会受到多方面因素的影响,因此为了科学地应用该项技术,多年来人们一直致力于该领域的研究。污水源热泵系统的运行模式是小温差、大流量,与传统供热方式相比,输送管线投资大,输送能耗大。总之输送距离与工程造价、运行费用以及供热、供冷的可靠性有直接关系。另外,从污水源热泵的节能原理可知,冬季水源水温越高,污水源热泵系统COP则越大;反之,夏季水源水温越高,污水源热泵系统EEF则越小。因此在污水水温度一定的条件下,若污水设计可利用温差选择太大,会直接影响热泵系统的性能,同时会影响设备的安全运行。本文根据相关标准的最大输送能效比,测算得到该系统的最大供热距离;并根据水-水换热器的换热基本原理,计算分析得到该系统污水可利用温差。本文还应用动态负荷分析方法确定建筑热指标以及评估供热能力;并对供热温度较低、对用户直供等特殊问题提出末端系统连接方式及运行调节方案;最后对该系统节能与环境效益进行了评估。
[Abstract]:Sewage source heat pump (SWHP) is a kind of renewable energy utilization technology, which absorbs the heat or cooling capacity of sewage through heat pump technology, thus heating or cooling buildings. Because sewage source heat pump is efficient and energy saving, its application is of great significance in energy saving and low carbon city development. Because the performance of sewage source heat pump is affected by many factors, in order to apply this technology scientifically, people have been devoted to the research in this field for many years. The operation mode of sewage source heat pump system is small temperature difference and large flow rate. Compared with the traditional heating mode, the pipeline investment is large and the energy consumption is large. In short, transportation distance is directly related to project cost, operation cost and reliability of heating and cooling. In addition, from the energy saving principle of sewage source heat pump, the higher the water source temperature in winter, the larger the COP of sewage source heat pump system; on the contrary, the higher the source water temperature in summer, the smaller the EEF of sewage source heat pump system. Therefore, if the temperature difference of sewage design is too large, the performance of the heat pump system will be directly affected and the safe operation of the equipment will be affected. In this paper, the maximum heating distance of the system is calculated according to the maximum energy efficiency ratio of the relevant standards, and the temperature difference of the system sewage is calculated and analyzed according to the basic principle of heat transfer of the water-water heat exchanger. This paper also applies dynamic load analysis method to determine building heat index and evaluate heating capacity, and puts forward terminal system connection mode and operation regulation scheme for special problems such as low heating temperature, direct supply to users and so on. Finally, the energy saving and environmental benefits of the system are evaluated.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU83

【相似文献】