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Experimental Analysis of Solar Energy Combined with Phase change Energy Storage Ventilation System 总被引:1,自引:0,他引:1
Solar Ventilation System is unstable and uncontrollable, so a new technology is proposed to get a system that takes solar energy as heat source and applies phase change material in daytime to store energy which is used to keep ventilation in nighttime by thermal pressure. This new system is helpful to get the ideal ventilation effect for buildings. Through the experiments on ventilation with PCM of 63℃ and 44℃, ventilation rate change curve is obtained to analyse ventilation system efficiency. The results indicate that using the PCM of 63℃ and 44℃, the total ventilation of the solar ventilation system in 10 hours are respectively 8066 m3 and 6154 m3 at night, and the average ventilation per hour and area are 538 m3/h and 41 m3/h. Based on the experiment, when PCM is palmitic acid, the ventilation effect is superior than that of lauric acid. To sum up, the system of conventional solar rooftop ventilation system combined with phase change materials can intensify the nature ventilation effectively in nighttime for buildings, improve indoor thermal environment and reduce the energy consumption in air conditioning building. 相似文献
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为解决高大平房仓机械通风不均匀等问题,在原有平面通风道的基础上,于粮堆中增设相应数量的直竖式通气竹笼,使之形成粮堆立体通风网络。试验表明:可提高通风效果和均匀度,消除死角,加快降温速度,缩短通风时间,节约费用,为立体通风提供一条新途径。 相似文献
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Some problems about ventilation in extra long highway tunnels have been discussed in this paper. The ventilation modes and geometry parameters of longitudinal blow-suction ventilation of Xuefengshan Tunnel in Hunan Province (7 000 m) have been studied and calculated. Based on this, the general design, principle design, technical design and relative structural design of ventilation for the tunnel have been successfully done. 相似文献
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在高大房式仓机械通风网络中存在的“死角”问题极不利于粮食的安全储藏。根据途径比理论,在“死角”部位设计并安装了一种辅助径向通风笼,取得很好的效果。本文通风笼的安装部位和尺寸进行了理论推算,对其在运用过程中的合理性和科学性进行了探讨。 相似文献
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为了解决一般深层粮堆通风干燥中存在的水分垂直分层问题 ,开发了移动组合式立体通风系统 ,并应用该系统在江西南昌进行了稻谷通风干燥试验。试验原粮 15 33t,平均水分 17.4 %。从 2 0 0 3年 1月 2 5日到 4月 2 4日 ,利用地上笼风道通风 198小时 ,移动组合式立体通风 2 0 0小时 ,各层水分分别降低为表层 15 .3% ,上层 14 .7% ,中层 13.7% ,下层14 .4 % ,全仓平均 14 .5 % ,水分梯度小于 0 .6 % /m粮层 ,各层水分最大相差 1.6 % ,明显改善了水分的垂直分层现象。试验共耗电 190 6 8kW·h ,单位能耗 0 .37kW·h/kg水。干燥前后稻谷的发芽率等品质指标无明显变化 ,较好地保持了粮食的原始品质。 相似文献
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为获得最优的冬季自然通风时段,以兰州地区某地板供暖民用住宅为研究对象,考虑围护结构对室外温度波的衰减和延迟效应,得到建筑围护结构的等热流边界条件。在此基础上,采用FLUENT软件对不同通风时段的室内污染物浓度场进行了数值分析,结果表明:同一开窗方式时,不同时段的通风时长不同,不同进风温度对室内污染物的时空分布及迁移特性影响显著,综合考虑污染物排除效果及舒适性,发现 17:00时开始通风为最优通风时段。 相似文献
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The paper analyzes the thermal characteristics of a natural ventilation cold stor-age,It shows that the calculating temperature in or outside the room is mainly effected by atmo-spheric temperature and the calculating temperature for a cold storage. They are determined by thelocal meteorological parameters. 相似文献
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采用机械通风技术,在外温高子粮温时,用7.5kW电机驱动风机强制通风28h,可使原始水分16%的稻谷降低2-2.4个水分。与晾晒,烘干相比,可节约费用5-10倍。最佳通风时间为午夜0时至次日凌晨5时之间。 相似文献
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为了研究平房仓横向通风技术在玉米储藏上的应用效果,明确玉米储藏过程横向通风工艺及其参数,利用高大平房仓中设计安装的横向通风设施,以及在储藏玉米粮堆中预埋的插入式毕托管,对高大平房仓横向通风系统进行实仓测试。全面开展了玉米储藏过程中横向通风工艺应用研究,测试了在横向通风系统通风时,风速、风量、系统各部分阻力和粮堆压力分布。研究发现,在储藏玉米的高大平房仓中应用横向通风系统时,粮堆单位粮层阻力较小,在实用单位通风量时,横向通风系统总阻力不大于1200Pa;同时横向通风还具有风量分配均匀、粮堆通风均匀性良好的特点。该研究为玉米在配备横向通风系统的高大平房仓储藏提供了技术支持。 相似文献
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粮食储藏中机械通风技术应用较普遍,但如果通风不均匀而形成通风死角,会影响粮食的安全储藏,本文就机械通风死角的检查与处理方法略述如下。 相似文献
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Wang Shiaoli Qian Zhenyong 《保鲜与加工》1990,(5):75-82
A method for designing the auxiliary ventilation system for long
drivages with multiple fans spaced in series in long duels is proposed based on the criterion that no recirculation takes place between the air flowing in the duct line and the surrounding air, A recurrence method is also given to calculat the leakage and the resistance lose of the duct taking into account of the relationship among the pressure, resistance and the leakage of the duct. The calculating results show that the present method is belter than the other methods. 相似文献
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粮食套筒快速降温装置研制 总被引:1,自引:0,他引:1
采用套筒对发热粮食进行通风快速降温,一次可处理发热粮30t,使粮温稳定,粮食安全过夏。与常规通风比较,其经济效益和社会效益更加显著。 相似文献