地源热泵系统非平衡冷热负荷运行特性研究

Ground Source Heat Pump System Operating Characteristics In Non-equilibrium Cooling and Heating Load

中文关键词: 地源热泵  负荷  传热模型  热阻  运行特性

英文关键词: ground  source heat  pump system, load, heat  transfer model, thermal  resistance, operating  characteristics

中文摘要:

      建立地埋管传热模型和系统能耗模型,对非平衡冷热负荷条件下地源热泵系统运行特性进行模拟计算。当建筑空调冷负荷大于热负荷,且供冷时间较长时,地源热泵系统从冬季初始运行,到达夏季时段,地温比夏季初始运行低,更加有利于夏季地源热泵系统节能。地源热泵系统运行7年后,采取夏季和冬季初始运行两种方案的地埋管钻孔壁年平均温度与土壤初始温度相比,分别上升3.1℃和5.12℃,导致机组耗功率逐年增加,应考虑采用复合式地源热泵系统间歇运行或增设地埋管设置分区运行策略,平衡土壤换热量。

英文摘要:

      Using heat transfer model for buried tube and energy consumption model for system, ground source heat pump system operating characteristics was simulated in non-equilibrium cooling and heating load. The schemes initial operating in summer for ground source heat pump system are better for energy efficiency when cooling load is greater than heating load and cooling for a long time. The annual average buried pipe drill hole wall temperature increased 3.1℃ and 5.12℃ respectively compared with the soil initial temperature by the schemes initial operating in summer and winter when seven years later, leading units energy consumption increased year by year. Intermittent operating for composite ground source heat pump system or divided operating for increased buried pipes should be adopted to balance soil heat transfer.