独立新风结合辐射冷吊顶系统节能舒适性研究
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摘要
独立新风系统(DOAS)这个被美国能源部列为21世纪美国最具优势的空调技术一经提出,便得到了国内外相关人员的广泛关注。而它与辐射冷吊顶系统(CRCP)的结合造就了一种新型、高效、节能、舒适的空调系统。
本文采用软件模拟的方式对独立新风结合辐射冷吊顶系统(DOAS&CRCP)在夏季工况的节能性与舒适性进行了模拟研究。以武汉某公共建筑一标准层为建筑载体,运用Energyplus软件将该系统与一次回风全空气系统、风机盘管加新风系统进行设计日与夏季空调季的能耗模拟,得出了本系统在设计日与整个夏季空调季分别比一次回风全空气系统节能40%与45%,而比风机盘管加新风系统分别节能25%与17%,通过各设备能耗数据的分析,得出本系统节能潜力在于冷水机组的综合COP提高以及风机能耗的显著下降这一结论。
除此之外,本文对DOAS&CRCP系统的回热、操作温度差进行了研究,结果表明换热效率为0.6的全热回收器可以为该系统节能24%,而关于操作温度,DOAS&CRCP系统要比一次回风全空气系统低0.65℃左右,室内设定干球温度有1.3℃的提升潜力,模拟结果表明设定温度的提高可以带来2%-3%的能耗节省。而为了考察该空调系统在不同类型建筑以及不同气候特征地区的适用性,作者分别进行了能耗模拟,发现DOAS&CRCP系统在不同类型公共建筑中都有较好的能耗表现,而对于不同气候地区的适用性方面,模拟结果显示该系统在热湿较大的地区的节能潜力要小于相对干燥的地区。最后为了研究DOAS&CRCP系统在舒适性方面的优势,作者运用AIRPAK软件对该系统和一次回风全空气系统进行建模,通过分析室内温度场以及速度场,得出前者无论是在室内温度场的均匀性还是送风舒适性上都有明显优势。
The Dedicated Outdoor Air System(DOAS) system is listed by the US Department of Energy as one of the most advantageous HVAC systems in the 21th century. This system attracted a lot of attention around the world once it had been brought up. And the combination between DOAS and Ceiling Radiant Cooling Panel (CRCP) can not only settle the condensation problem, but also provide an efficient、energy-conservation HVAC system.
This paper aims to investigate on energy conservation and indoor comfort of DOAS&CRCP system in summer. It uses one floor of public building in wuhan as a vector, and initiates a energy simulation for All-Air system, DOAS&CRCP system, FC&OA system by Energyplus software. It’s concluded that DOAS&CRCP system has 40%,45% energy-conservation potential in design-day and cooling season respectively, compared with All-air system, as for the FC&OA system, the number is 25% and 17%. And after the energy consumption figures of equipments is analyzed, we reach the conclusion that the energy-conservation potential is attributed to the improvement of comprehensive COP and significant reduction in energy consumption of central fan.
Besides, the research on influence of heat recovery and operative temperature on energy-performance of DOAS&CRCP system has disclosed a fact that DOAS&CRCP system could have a 24% energy-reduction in Wuhan when the system make use of Heat Recovery Device with the efficiency level of 0.6. And the operative temperature of DOAS&CRCP system is 0.65℃lower than All-Air system, in another word, the setpoint of design indoor dry temperature in summer could have 1.3℃increase, which will lead to 2%-3% energy-conservation. And author have do some research on energy-consumption in different kinds of public buildings, and the figures indicate that DOAS&CRCP system could adapt to all these buildings and have a very good energy-performance. Apart from that, the system adaptability in different sorts of region of DOAS&CRCP system in summer is investigated, the result shows that the system has a larger energy-conservation potential in relatively dry areas.
As for the indoor comfort, author has compared the temperature field and velocity field of DOAS&CRCP system and All-Air system with the AIRPAK code. The data shows that the former system could provide a more comfortable indoor environment.
本文采用软件模拟的方式对独立新风结合辐射冷吊顶系统(DOAS&CRCP)在夏季工况的节能性与舒适性进行了模拟研究。以武汉某公共建筑一标准层为建筑载体,运用Energyplus软件将该系统与一次回风全空气系统、风机盘管加新风系统进行设计日与夏季空调季的能耗模拟,得出了本系统在设计日与整个夏季空调季分别比一次回风全空气系统节能40%与45%,而比风机盘管加新风系统分别节能25%与17%,通过各设备能耗数据的分析,得出本系统节能潜力在于冷水机组的综合COP提高以及风机能耗的显著下降这一结论。
除此之外,本文对DOAS&CRCP系统的回热、操作温度差进行了研究,结果表明换热效率为0.6的全热回收器可以为该系统节能24%,而关于操作温度,DOAS&CRCP系统要比一次回风全空气系统低0.65℃左右,室内设定干球温度有1.3℃的提升潜力,模拟结果表明设定温度的提高可以带来2%-3%的能耗节省。而为了考察该空调系统在不同类型建筑以及不同气候特征地区的适用性,作者分别进行了能耗模拟,发现DOAS&CRCP系统在不同类型公共建筑中都有较好的能耗表现,而对于不同气候地区的适用性方面,模拟结果显示该系统在热湿较大的地区的节能潜力要小于相对干燥的地区。最后为了研究DOAS&CRCP系统在舒适性方面的优势,作者运用AIRPAK软件对该系统和一次回风全空气系统进行建模,通过分析室内温度场以及速度场,得出前者无论是在室内温度场的均匀性还是送风舒适性上都有明显优势。
The Dedicated Outdoor Air System(DOAS) system is listed by the US Department of Energy as one of the most advantageous HVAC systems in the 21th century. This system attracted a lot of attention around the world once it had been brought up. And the combination between DOAS and Ceiling Radiant Cooling Panel (CRCP) can not only settle the condensation problem, but also provide an efficient、energy-conservation HVAC system.
This paper aims to investigate on energy conservation and indoor comfort of DOAS&CRCP system in summer. It uses one floor of public building in wuhan as a vector, and initiates a energy simulation for All-Air system, DOAS&CRCP system, FC&OA system by Energyplus software. It’s concluded that DOAS&CRCP system has 40%,45% energy-conservation potential in design-day and cooling season respectively, compared with All-air system, as for the FC&OA system, the number is 25% and 17%. And after the energy consumption figures of equipments is analyzed, we reach the conclusion that the energy-conservation potential is attributed to the improvement of comprehensive COP and significant reduction in energy consumption of central fan.
Besides, the research on influence of heat recovery and operative temperature on energy-performance of DOAS&CRCP system has disclosed a fact that DOAS&CRCP system could have a 24% energy-reduction in Wuhan when the system make use of Heat Recovery Device with the efficiency level of 0.6. And the operative temperature of DOAS&CRCP system is 0.65℃lower than All-Air system, in another word, the setpoint of design indoor dry temperature in summer could have 1.3℃increase, which will lead to 2%-3% energy-conservation. And author have do some research on energy-consumption in different kinds of public buildings, and the figures indicate that DOAS&CRCP system could adapt to all these buildings and have a very good energy-performance. Apart from that, the system adaptability in different sorts of region of DOAS&CRCP system in summer is investigated, the result shows that the system has a larger energy-conservation potential in relatively dry areas.
As for the indoor comfort, author has compared the temperature field and velocity field of DOAS&CRCP system and All-Air system with the AIRPAK code. The data shows that the former system could provide a more comfortable indoor environment.
引文
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[3]夏学鹰,张旭,蔡宁.地板辐射供冷/独立新风系统的技术分析与实验研究[J].制冷学报, 2008,29(4):18-23.
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[5]柴菁,杜洪范.独立新风系统冷源方式的选择分析[J].山东建筑大学学报, 2007,22(5):430-433.
[6]刘晓华.温湿度独立控制空调系统及其性能分析[J].中国建设信息供热制冷, 2008(07).
[7]邱相武.新风利用与热回收的动态分析与研究.北京:中国建筑科学研究院.2001.[硕士论文]
[8]马玉奇,刘学来,李永安.辐射顶板空调系统研究与发展综述[J].制冷, 2008,27(2):29-34.
[9] Jeong, J.-W. and S.A. Mumma, Ceiling radiant cooling panel capacity enhanced by mixed convection in mechanically ventilated spaces. Applied Thermal Engineering, 2003. 23(18): 2293-2306.
[10]何婧.独立新风与辐射供冷系统防结露问题探讨[J].暖通空调, 2008,38(6):159-163.
[11]韩星,张旭,杨洁.采用常规冷水机组作为冷源的辐射供冷加新风系统形式分析及能耗计算[J].建筑科学, 2007,23(10):40-43.
[12]田喆，朱能，涂光备.冷却顶板系统应用中的一些问题[J].暖通空调, 2004,34(3):73-76.
[13]吴薇.上海某公共建筑空调系统节能改造实践与研究.上海:上海同济大学.2007.[硕士论文]
[14] Jae-Han Lim, Jae-Hun Jo. Application of the control methods for radiant floor cooling system in residential buildings. Building and Environment, 2006,41:60-73.
[15]王靖,胡特,谢玉川.现代住宅室内通风方式探讨[J].制冷与空调,2003(2):15-17.
[16]王厉,李念平,杨志昂.实现新风系统经济运行的控制方法研究[J].建筑热能通风空调, 2003(2):4-7.
[17]王厉,李念平,龙舜心.新风系统经济运行控制策略的分析与研究[J].暖通空调, 2003,33(2):129-132.
[18]余红英,王巍,陈琪.独立新风系统的应用[J].制冷空调与电力机械, 2004(6):54-56.
[19]宋玮,冀兆良,龚明启.独立新风空调系统的节能分析[J].制冷, 2005(5):30-34.
[20]王倩,高建红.低温送风空调系统焓湿图分析[J].暖通空调, 2008,38(7):93-97.
[21]殷平.冰蓄冷低温送风系统设计方法(2):焓湿图分析和空调机组选择计算[J].暖通空调, 2004,34(9).
[22]肖益民,付祥钊.冷却顶板空调系统中用新风承担湿负荷的分析[J].暖通空调, 2002,32(3):15-17.
[23]谢洪辉,徐文华.独立新风系统的探讨和应用[J].洁净与空调技术, 2004(3):38-41.
[24]马玉奇,刘学来,李永安.冷却顶板结露问题分析[J].山东建筑大学学报, 2007,22(6):537-540.
[25]殷平.空调大温差研究(1):经济分析方法[J].暖通空调, 2000,30(4):62-66.
[26]朱钟浩.风机盘管(干工况运行)加独立新风空调系统的研究[J].广东建材, 2007(9).
[27]王建伟.中央空调系统节能研究.上海:上海海事大学,2006.[硕士论文]
[28]左涛.独立新风结合吊顶冷辐射板(Doas+Crcp)空调系统的应用[J].制冷空调与电力机械, 2006(5):61-64.
[29] Yiqun Pan , R.Y., Zhizhong Huang, Energy modeling of two office buildings with data center for green building design. Energy and Buildings, 2008.,40: 1145–1152.
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