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本文通过实验研究了直接蒸发式有机填料表面污垢的形成过程及其对填料性能的影响.着重详细分析了淋水硬度、淋水流量等因素在结垢过程中的影响规律,以及污垢对填料蒸发效率和空气阻力的具体影响.实验结果表明:污垢的存在会影响填料纤维的吸水性和空气的流通性,从而降低蒸发效率和增大空气阻力,但影响过程比较缓慢.污垢沉积量在一定淋水硬度范围内随着淋水硬度的增加而增加,相反,污垢沉积量随着淋水流量的增加而减少.本次实验结果将为接下来对有机填料结垢实验的进一步研究奠定基础. 相似文献
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由可再分散乳胶粉、灰钙粉、双飞粉、滑石粉、纤维素醚、负离子添加剂及助剂组成的干粉涂料,施工时按加水量多少,可分别作内墙腻子和涂料使用,涂层具有较高的粘结强度和耐擦洗性,具有吸收CO2、释放负离子、清新空气、抗菌防霉等功效。 相似文献
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《建筑热能通风空调》2016,(2)
本文分别对直接蒸发冷却器、管式间接蒸发冷却器和间接-直接蒸发冷却复合冷水机组的性能进行了理论分析,并用实验加以验证。结果表明直接蒸发冷却器的冷却效率不高且送风湿度偏大,空气处理过程为等焓降温(绝热加湿)过程,实际出口空气温度接近进口空气湿球温度;管式间接蒸发冷却器的冷却效率较高,空气处理过程为等湿降温过程,送风温度趋近于进风的露点温度;间接-直接蒸发冷却复合冷水机组的冷却效率高,机组出水温度在室外空气的湿球温度与露点温度之间,其冷幅深的值随室外干湿球温度的波动呈现不稳定趋势,且冷幅高的值较为稳定,在1℃范围内波动,因此采用冷幅高来表征间接-直接蒸发冷却复合冷水机组的出水温度特性。 相似文献
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5种室内观赏植物的空气负离子浓度研究 总被引:1,自引:0,他引:1
随着大气环境问题日趋严重,室内环境问题也逐渐成为人们最关心的问题。本文选取金边吊兰、金边虎尾兰、白掌、芦荟和绿萝5种常用室内观赏植物作为研究对象,分别于晴天和阴雨天监测其24 h的负离子浓度、温度和湿度。实验结果表明:1)晴天5种室内观赏植物释放负离子浓度平均值由大到小依次为金边虎尾兰金边吊兰芦荟白掌绿萝;2)阴雨天5种室内观赏植物释放负离子浓度平均值由大到小依次为绿萝金边吊兰芦荟金边虎尾兰白掌;3)5种室内观赏植物以白掌和绿萝释放的负离子浓度较为稳定,金边吊兰和金边虎尾兰释放的负离子浓度变化幅度较大。研究结果表明:1)室内观赏植物因其生长习性差异而导致释放的负离子浓度不同,同一种室内观赏植物在不同时间、不同天气状况下释放的负离子浓度也不尽相同;2)金边吊兰和金边虎尾兰适合放置在夜间活动频繁的空间,白掌和芦荟适合白天活动频繁的空间;3)晴天优先选择金边虎尾兰,阴雨天优先选择绿萝。本研究为室内植物选择和室内空气质量改善等方面提供参考,同时对优化城市生态环境和城市规划建设具有重要的指导意义。 相似文献
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为进一步研究压缩机能耗及蒸发式冷凝器换热性能,本文采用对比实验的方法,研究了冷凝器进风温度,进风湿度以及喷淋水量等因素对空冷与蒸发式冷凝器的压缩机能耗及换热性能的影响。通过研究表明,冷凝器进风空气湿度对压缩机耗功量的影响较小,而压缩机耗功量随进风温度的增加而增加,随喷淋水量增加呈先减小后增加的趋势,喷淋水量在不同的进风温度工况下存在最佳值,蒸发式冷凝器管外复合换热系数随进风温度的增加而递减,随喷淋水量增加而增大。 相似文献
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耐擦洗抗菌内墙乳胶漆的研制 总被引:3,自引:0,他引:3
选用低VOC含量、低成膜温度的合成树脂乳液为成膜物质,摒弃成膜助剂和二醇类防冻剂,选用低毒、高效的助剂,引入纳米SiO2和负离子抗菌添加剂,制备的乳胶漆VOC含量极低,涂膜具有较高的耐洗刷性、耐沾污性、防霉抗菌性,同时释放负离子,清新空气,有效消除空气中的甲醛、苯、氨、异味等,具有环保性和辅助保健功能. 相似文献
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直接蒸发冷却空调机性能研究 总被引:15,自引:0,他引:15
分析了影响直接蒸发冷却空调机性能的因素,然后对天然植物纤维填料式直接蒸发冷却空调机性能进行了实验研究并获得了相关性能曲线。研究结果表明,直接蒸发冷却空调机在我国西北干旱和半干旱地区降温加湿效果很好,完全可以达到舒适性要求,是一种节能的绿色空调;天然植物纤维填料阻力较大,但降温加湿效果更好。 相似文献
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对铝箔金属填料直接蒸发冷却空调机进行了实验研究。分析了进口空气干球温度、相对湿度对空调机降温及冷却效率的影响,为直接蒸发冷却式空调机性能的提高具有一定的参考意义。 相似文献
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本文测试了兰州市内一台金属填料直接蒸发冷却器,获得了干湿球温度、相对湿度、冷却效率、阻力等技术参数。分析了进口处空气干球温度和相对湿度对蒸发冷却效率的影响,发现被测试的机组蒸发冷却效率较低,蒸发冷却段阻力较大,因此,需要改善设计。由于兰州属于干燥地区,因此通过优化设计,蒸发冷却效率有提升的空间。 相似文献
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Evaporative cooling has been proved as an effective method of storage of fruits and vegetables of moderate respiration rates. Therefore, a modified evaporative cooler named two-stage evaporative cooler (TSEC) has been developed to improve the efficiency of evaporative cooling for high humidity and low temperature air conditioning. Two-stage evaporative cooler consists of the heat exchanger and two evaporative cooling chambers. The performance of cooler has been evaluated in terms of temperature drop, efficiency of the evaporative cooling and effectiveness of TSEC over single evaporation. The temperature drop through TSEC ranged from 8 to 16 °C. With the several observations for diurnal runs, it was observed that TSEC could drop the temperature up to wet bulb depression of ambient air and provided the 90% relative humidity. Efficiency of single evaporation was 85–90%. Effectiveness of the two-stage evaporative cooling was found to be 1.1–1.2 over single evaporation. The two-stage evaporative cooler provided the room conditions as 17–25 °C temperature and 50–75% relative humidity, which can enable to enhance the shelf-life of wide range of fruit and vegetables of moderate respiration rates. 相似文献
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Ghassem Heidarinejad Mojtaba Bozorgmehr Shahram Delfani Jafar Esmaeelian 《Building and Environment》2009
Cooling performance of two-stage indirect/direct evaporative cooling system is experimentally investigated in the various simulated climatic conditions. For this purpose, a two-stage evaporative cooling experimental setup consisting of an indirect evaporative cooling stage (IEC) followed by a direct evaporative cooling stage (DEC) was designed, constructed and tested. Due to the wide variety of climatic conditions in Iran, two air simulators were provided to simulate outdoor design condition of different cities in primary and secondary air streams. Results show that under various outdoor conditions, the effectiveness of IEC stage varies over a range of 55–61% and the effectiveness of IEC/DEC unit varies over a range of 108–111%. Aspects of achieving comfort conditions and power saving have been investigated with related excess water consumption. Considering the evaporative comfort zone, this system can provide comfort condition in a vast region in Iran where direct evaporative alone is not able to provide summer comfort condition. More than 60% power saving could be obtained by this system in comparison with mechanical vapor compression systems with just 55% increase in water consumption with respect to direct evaporative cooling systems. This system can fill the gap between direct evaporative cooling systems and mechanical vapor compression systems as an energy efficient and environmentally clean alternate. 相似文献
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海洋极地馆是极地动物展示和表演的场所。为满足各种海洋动物对海水温度及环境的不同要求,满足游人观赏、工作人员办公的温湿度要求,该工程除采用常规空调系统外,还设置了极地海洋动物维生空调系统和维生水系统。冷热源为直燃式溴化锂机组,可同时供冷、供热,在不能满足要求的地方设置直接蒸发式风冷机组。该工程已正常运行两年,满足使用要求。 相似文献
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为模拟混凝土内部与盐溶液接触、外部与空气接触的半浸泡环境(如隧道衬砌混凝土所处环境),将混凝土一端与Na_2SO_4溶液接触,另一端暴露在空气中,通过改变环境相对湿度、水灰比和Na_2SO_4溶液质量分数,分析这3种因素对混凝土水分蒸发速率的影响,对混凝土内部的盐溶液传输机理是否符合灯芯效应传输原理进行验证;同时采用核磁共振(NMR)和X射线衍射(XRD)分析,从微观角度分析其中原因.结果表明:环境相对湿度越低、水灰比越大,混凝土水分蒸发速率越大;Na_2SO_4溶液质量分数越大,混凝土水分蒸发速率反而越低,说明当混凝土处于半浸泡环境下时,其中的Na_2SO_4溶液传输过程并不符合灯芯效应传输原理.NMR和XRD分析发现,在盐溶液传输过程中,混凝土孔隙内的盐溶液会发生化学反应,生成钙矾石和石膏等化学侵蚀产物,细化和堵塞孔隙,且环境相对湿度越大、盐溶液质量分数越大,化学反应程度越大,从而造成其中的水分蒸发速率降低越明显. 相似文献
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《Building and Environment》2001,36(1):15-25
The article examines the possibility of space conditioning the interiors of a multistorey office building in Delhi using evaporative cooling in the summer months of April, May and June. The temperature and humidity conditions obtained in a room of the building with direct evaporative cooling are studied by simulation. In this case study, the room is assumed to have a south-facing wall with a window and all other walls, ceiling and floor are interior partitions. The effect of number of air-changes per hour (ACH) from 1 to 40 and fresh-air bypass factor (BPF) 0% to 100% on performance is studied by simulation. The aim is to find whether some combination of ACH and BPF succeeds in keeping room conditions below 80% RH and temperatures between 27 and 31°C, depending on RH. It is found that the desired results are achieved by keeping the ACH and the BPF within certain limits depending on weather conditions. If the temperature and relative humidity of the ambient air are too high then a direct evaporative cooler cannot achieve comfort in the room. Appropriate combinations of ACH and BPF have to be selected to obtain the best results. 相似文献