管长设计方法对地源热泵长期性能的影响

来源期刊:中南大学学报(自然科学版)2021年第6期

论文作者:韩宗伟 张宏志 杨灵艳 李锦堂

文章页码:1846 - 1854

关键词:地源热泵;管长设计方法;动态模拟;负荷;运行性能;经济性

Key words:ground source heat pump; pipe length design method; dynamic simulation; load; operation performance; economy

摘    要:为研究不同管长设计方法对地源热泵系统长期运行性能和经济性产生的影响,选取北京地区某办公建筑为研究对象。根据GB 50366—2005“地源热泵系统工程技术规范”中埋管出口温度在夏季和冬季的安全运行约束范围要求(方法一)和半经验公式法(方法二),分别计算地埋管总长度;利用COMSOL Multiphysics软件模拟2种方法下地源热泵系统长达10 a的动态性能,比较2种方法下地源热泵系统运行 10 a的总成本。研究结果表明:方法二设计得到的地埋管总长度较长,地埋管的热性能和地源热泵系统的长期运行性能均较佳;在最大冷负荷和最大热负荷分别为42.11 kW和40.20 kW时,方法二设计条件下的地埋管总长度比方法一设计条件下的增加了11.60%;当热泵系统运行10 a后,与方法一设计条件下相比,方法二设计条件下的地埋管平均出口温度在供冷期降低了2.67 ℃,在供暖期升高了1.67 ℃,方法二设计条件下的机组平均性能系数在供冷期增加了5.33%,在供暖期增加了1.40%;不同管长设计方法对热泵系统运行性能的影响差异随着建筑负荷增大而变小;当单位管长埋管总成本与每度电电费的比值大于等于148.2 kW·h/m时,方法一设计条件下的系统总成本具有优势。

Abstract: To study the influence of different pipe length design methods on the long-term operation performance and economy of ground source heat pump system, an office building in Beijing was selected as research object. According to the safe operation restriction range requirements of buried pipes outlet temperature in summer and winter (Method 1) and the semi-empirical formula method (Method 2) in GB50336—2005 "technical code for ground source heat pump system", the total length of buried pipes was calculated respectively. The dynamic performance of ground source heat pump system with two design methods was simulated for 10 a by COMSOL Multiphysics software, and the total cost of ground source heat pump system running for 10 a with two design methods was compared. The results show that the total length of buried pipes designed in Method 2 is longer, and the thermal performance of buried pipes and the long-term operation performance of ground source heat pump system designed in Method 2 are both better. When the maximum cooling loads and the maximum heating loads are 42.11 kW and 40.20 kW respectively, the total length of buried pipes under the design condition of Method 2 is 11.60% more than that under the design condition of Method 1. When the heat pump system runs for 10 a, compared with the design condition of Method 1, the average outlet temperature of buried pipes under the design condition of Method 2 decreases by 2.67 ℃ in cooling period, and increases by 1.67 ℃ in heating period, the average coefficient of performance of the unit under the design condition of Method 2 increases by 5.33% in cooling period, and increases by 1.40% in heating period. The influence of different pipe length design methods on the performance of heat pump system decreases with the increase of building loads. When the ratio of total cost of buried pipes per unit length to electricity charge per kilowatt hour is greater than or equal to 148.2 kW·h/m, the total cost of system under the design condition of Method 1 is advantageous.

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号