空气—土壤复合热源热泵系统经济性分析

发布时间：2018-09-05 11:30

【摘要】：在夏热冬冷地区,由于其特定的气候条件,建筑全年冷负荷远远大于热负荷,土壤源热泵系统长期单独运行将导致释放到土壤中的热量远远大于从土壤中提取的热量,致使土壤温度逐年升高,热泵工作条件持续恶化,机组性能系数下降,从而影响空调系统的正常运行。新型空气-土壤复合热源热泵系统能够解决土壤源热泵系统单独运行所导致的土壤热失衡问题,系统性能系数较高。但对于项目投资者而言,不光要考虑系统性能,经济性也是其需要考虑的重要因素。本文以长沙某别墅建筑空调系统为例,利用TRNSYS仿真模拟软件对连续运行和间歇运行两种运行模式下的空气-土壤复合热源热泵系统和单一土壤源热泵系统的全年运行能耗进行模拟研究。计算各方案的初投资、运行维护费用,并用动态费用年值法对各方案的经济性进行评价。选用基准折现率、系统寿命周期及系统初投资作为敏感性分析因素,研究各方案下敏感因素对费用年值影响的敏感程度,从而找出最敏感因素,为投资者做出正确的决策提供参考。研究结果表明:无论是在连续运行还是间歇运行模式下,相比于单一土壤源热泵系统,新型空气-土壤复合热源热泵系统具有一定的经济性优势,分别只需6.2年和7.8年即可收回追加投资额。对空气-土壤复合热源热泵系统和单一土壤源热泵系统而言,连续运行模式都要比间歇运行模式更为经济。另外,通过对系统进行敏感性分析,表明初投资对系统费用年值的影响程度最大,基准折现率次之,寿命周期对费用年值的影响程度最小,且费用年值随着初投资和基准折现率的增大而增大,随寿命周期的增大而减小。
[Abstract]:In the hot summer and cold winter area, because of its special climatic conditions, the annual cooling load of the building is far greater than the heat load, and the long-term operation of the ground-source heat pump system alone will lead to the release of heat into the soil much more than the heat extracted from the soil. As a result, the soil temperature increases year by year, the working condition of heat pump continues to deteriorate, and the performance coefficient of the unit decreases, thus affecting the normal operation of the air conditioning system. The new air-ground composite heat source heat pump system can solve the problem of soil heat imbalance caused by the single operation of the ground-source heat pump system, and the system performance coefficient is high. But for the project investors, not only the system performance should be considered, but also the economy is an important factor to be considered. This paper takes the air conditioning system of a villa building in Changsha as an example. The annual energy consumption of air-ground heat pump system and single ground source heat pump system under continuous and intermittent operation was simulated by TRNSYS software. The initial investment and maintenance cost of each scheme are calculated, and the economy of each scheme is evaluated by using the dynamic cost annual value method. The sensitivity analysis factors such as benchmark discount rate, system life cycle and system initial investment are selected to study the sensitivity of the sensitive factors to the annual cost value under each scheme, so as to find out the most sensitive factors. For investors to make the right decisions to provide reference. The results show that the new air-ground heat source heat pump system has a certain economic advantage compared with a single ground source heat pump system under the continuous or intermittent operation mode. It only takes 6.2 years and 7.8 years to recover the additional investment, respectively. For the air-ground heat pump system and the single ground source heat pump system, the continuous operation mode is more economical than the intermittent operation mode. In addition, the sensitivity analysis of the system shows that the impact of initial investment on the annual cost of the system is the largest, followed by the benchmark discount rate, and the impact of life cycle on the annual cost value is the least. The annual cost value increases with the increase of the initial investment and the base discount rate, and decreases with the increase of the life cycle.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU83

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