空调负荷计算中节能玻璃热工参数取值问题讨论.doc

空调水系统节能现状分析
郭庆刚1,樊越胜1,拓彩云1,曲博2
1西安建筑科技大学, 2 西安青云产业有限公司
摘要:文章针对空调水系统能耗偏大的原因进行了分析,讨论了可行的节能措施,结果表明,冷冻水供回水温差由3℃提高到5℃,可降低输送能耗约40%;选用一次泵变流量的空调水系统,将冷冻水泵和冷却水泵采用变频控制后,冷却水泵耗能由1121kwh降低到669kwh,冷冻水泵能耗由961kwh降低到488kwh,节能率约为45%。
关键词:空调水系统;变频;节能
Energy Efficiency Status Analysis of the Air-conditioning Water system
GUO Qinggang, FAN Yuesheng, TUO Caiyun
(School of Environment Engineering & City Planning, Xi’an University of Architecture & Technology
710055, China)
Abstract: The reasons of excessive transportation energy consumption in air-conditioning water system are analyzed, and measures of energy saving are discussed, Results indicate that the transportation energy consumption can be reduced by 40% when the temperature difference between supply and return chilled water increased from 3℃ to 5℃. Under the variable frequency operating, the energy consumption of the cooling water pump can be reduced from 1121kwh to 669kwh, while the chilled water pump from 961kwh to 488kwh, so the energy saving rate is about 45%.
Keywords: air-conditioning water system; variable frequency; energy efficiency
1 前言
在建筑能耗中,空调系统能耗是最大的组成部分。据统计,公共建筑中央空调系统能耗占建筑总能耗的40%~60%[1]。中央空调系统能耗主要由三部分组成:制冷主机能耗,风机、水泵输送系统能耗,末端设备能耗。研究指出,在大型公共建筑空调电力消耗中,有60%~70%是由输送和分配冷量(热量)的风机水泵所消耗[2]。
与欧美国家,特别是日本相比,我国目前空调输送能耗偏高很多,国内空调水输送能耗指标为59~143W/KW,日本绿色饭店空调水输送能耗评定指标规定值≤ W/KW[3],由此可见,我国空调输送系统还有很大的节能潜力。
2 空调水系统高能耗原因
引起空调水系统高能耗