共查询到19条相似文献,搜索用时 156 毫秒
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用盘管热环式换热器作为热回收装置,回收低温低湿新风的冷量,冷却室外新进的高温新风。经过空气处理过程分析和设备热工性能的计算,理论上证明该装置在消除室内新风口结露问题的前提下,除了通过热量回收实现节能外,还将部分由COP值较低的新风系统承担的负荷转由COP值较高的室内空气处理设备承担,节省了空调系统运行能耗。 相似文献
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选取哈尔滨、北京、海等5个建筑气候分区的代表城市,以同一办公建筑为例,分析全空气空调系统在未采用新风比调节及全热转轮热回收装置、仅采用新风比调节、仅采用全热转轮热回收装置和同时采用全热转轮热回收装置和新风比调节四种情况下的全年能耗差异,探讨适合不同地区节能建筑的全热转轮热回收装置和新风比调节的应用方式. 相似文献
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为了解决提高室内空气品质与降低新风处理能耗的矛盾,提出了由溶液全热回收装置和带板式换热器的单级喷淋模块组成的溶液全热回收型新风机.采用全热回收装置,明显降低了新风处理能耗;利用板式换热器调节溶液的温度,有效的改善了溶液的除湿或加湿能力.通过北京市全年逐时性能模拟分析,以及与常规新风机和其它两种不同形式的溶液热回收型新风机运行能耗的比较,进一步证实了该新风机具有明显的节能效果.溶液具有杀菌、除尘作用,能够避免新风和室内排风的交叉污染;而且新风处理能耗的降低,为新风量的增加提供了条件,能够进一步提高室内空气品质. 相似文献
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《建筑热能通风空调》2018,(11)
本文建立能耗分析数学模型,分析带热回收的冷却除湿新风机组,带热回收的双冷源新风机组及热泵式溶液除湿新风机组的能耗。研究表明,双冷源新风机组和热泵式溶液除湿机组的整体COP相比冷却除湿机组提高了26%和36%。在此基础上,计算了三种新风机组的初投资及年运行费用,得到双冷源新风机组和溶液除湿新风机组相对于带热回收的冷却除湿机组的初投资回收期,为辐射空调新风系统的节能设计提供参考。 相似文献
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结合工程概况,以相关设计规范为依据,介绍了主要设计参数及空调负荷,并从冷热源设备、风机盘管、新风系统、排风系统、热风幕系统,空调自控系统等方面对空调设计过程进行了阐述,为类似工程的空调设计提供了参考依据。 相似文献
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In conventional air-conditioning system, fresh air volume is always restricted to save energy, which sacrifices indoor air quality (IAQ) to some extent. However, removing the latent load of air by liquid desiccant rather than by cooling is an alternative way of reducing energy consumption. Therefore, IAQ can be improved by increasing the volume of fresh air introduced into an air-conditioning system. In this paper, a liquid desiccant based air-conditioning system is studied, with the system performance under various fresh air ratios analyzed using simulation tests. In addition, the proposed system and a conventional system are compared. In the proposed system, with the increase in fresh air ratio, the heating load for solution regeneration rises, the dehumidification efficiency increases and the regeneration efficiency drops. The coefficient of performance (COP) of the liquid desiccant based system decreases sharply when the fresh air ratio exceeds 60%. The results also show that the proposed system can save power notably. The maximum power saving ratio is 58.9% when the fresh air ratio is 20%; however, the ratio drops when the fresh air ratio increases. These findings will be beneficial in the selection of fresh air ventilation strategies for liquid desiccant based air-conditioning systems. 相似文献
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采用实地调研和情景假设法,对比分析了现场挂号后即时就诊与预约就诊两种诊疗模式下门诊挂号大厅内的人员数量分布及新风量需求。结果表明,开展预约就诊的医院挂号大厅一周内人数的日差异远小于采取现场挂号后即时门诊模式的医院,且新风需求量仅为后者的23.3%;采取预约就诊模式不仅能缩短患者排队等候时间,还能改善医院建筑室内空气品质,降低新风系统能耗;人员数量不断变化的门诊挂号大厅不宜采用定风量通风系统,应采用按需供应的通风模式,现场挂号、即时就诊模式的医院采用此通风模式节能效果更显著。 相似文献
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Fresh air ventilation is central to indoor environmental control. Total heat exchangers can be key equipment for energy conservation in ventilation. Membranes have been used for total heat exchangers for more than a decade. Much effort has been spent to achieve water vapor permeability of various membranes; however, relatively little attention has been paid to the selectivity of moisture compared with volatile organic compounds (VOCs) through such membranes. In this investigation, the most commonly used membranes, both hydrophilic and hydrophobic ones, are tested for their permeability for moisture and five VOCs (acetic acid, formaldehyde, acetaldehyde, toluene, and ethane). The selectivity of moisture vs. VOCs in these membranes is then evaluated. With a solution-diffusion model, the solubility and diffusivity of moisture and VOCs in these membranes are calculated. The resulting data could provide some reference for future material selection. PRACTICAL IMPLICATIONS: Total heat exchangers are important equipment for fresh air ventilation with energy conservation. However, their implications for indoor air quality in terms of volatile organic compound permeation have not been known. The data in this article help us to clarify the impacts on indoor VOC levels of membrane-based heat exchangers. Guidelines for material selection can be obtained for future use total heat exchangers for building ventilation. 相似文献
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介绍在车库排风、排烟及空调新风、排风系统中利用能量回收转轮这一新技术收到较大的节能效果。高能离子净化装置在新风、排风系统中的应用,解决和改善了VOC、微小可吸入颗粒对室内环境品质的影响。 相似文献
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探讨了架空地板送风系统的工作原理和特点,分析了该系统的送风静压层和送风特性,并从这种送风特性出发,综述了架空地板送风系统在室内空气品质、热舒适性和节能等方面的特点。通过分析,得出架空地板送风系统能够减小空气龄,提高换气效率和通风效率,显著改善室内空气品质;在热舒适方面,架空地板送风系统可以通过使用者调节出风方向和风量达到热舒适:在能耗方面,架空地板送风系统由于仅需维持工作区环境参数,使得送风量和风机压头减小,制冷机效率提高,在风机能耗和冷热源能耗上有着显著的经济效益。最后得出了架空地板送风系统将被广泛应用的结论。 相似文献
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某报告厅空调系统的设计及其能耗分析 总被引:5,自引:0,他引:5
介绍了西安某办公楼报告厅空调系统的设计。分别应用置换通风与混合通风两种通风方式,在室外和室内设计参数相同的情况下,充分比较了它们在送风量、新风量、能耗以及室内空气品质的不同。结果表明在某些应用场合,置换通风在空气品质提高和能耗降低上有明显的优势,同时这种优势不以牺牲热舒适性为代价,因此建议使用置换通风系统。 相似文献