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《可再生能源》2017,(2):218-223
同时利用地热能和太阳能来调节室内温度和室内空气品质,可实现可再生能源在建筑领域的优化利用。文章通过建立地道与太阳能烟囱复合通风系统模型,研究了地道长度、地道宽度、太阳能烟囱高度、地道进风口与太阳能烟囱出风口面积比等参数对房间通风量和室内温度的影响。研究结果表明:地道进风口与太阳能烟囱出风口面积比是影响房间通风量的主要因素;地道长度、地道进风口与烟囱出风口面积比是影响室内温度的主要因素;在复合通风系统的设计过程中,首先应优先考虑将地道长度增加至房间宽度的3倍以上,这样可提高复合通风系统的供冷能力,其次应保证地道进风口面积大于太阳能烟囱出风口面积,这样可降低地道的通风阻力,增加由地道进入到室内的风量,保证该复合通风系统能够较好地满足室内环境的热舒适性要求。 相似文献
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以人防救护站工程为例,首先总体通风方案设置时指出人防医疗工程将空调送排风系统与平时消防进排风系统进行合用能大大提高人防工程的经济效益,并说明了方案布置要点。然后进一步详细阐述了平战结合空调系统设计中的关键问题,如风量的确定、风机的选用与控制等,为人防设计人员对医疗工程的设计提供参考。 相似文献
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为了探究不同通风方式下装修室内甲醛的分布特性及其净化效果,利用仿真软件分别对装修住宅密闭、自然通风及机械通风共3种工况的甲醛浓度分布情况进行数值模拟。结果表明:密闭工况下,沙发和床附近甲醛浓度值最高,为0.08 mg/m3,厨房及卫生间的浓度值略低,约0.07 mg/m3。相对于密闭工况,自然通风风力等级0级时,次卧、主卧、客厅的甲醛浓度分别降低了1.5%~12.7%、29.0%~49.2%、14.7%~31.7%,次卧的通风效果较差;自然通风风力等级为1级时,次卧、主卧、客厅的甲醛浓度分别降低了36.8%~51.4%、68.1%~76.4%、53.3%~60.8%,各房间的通风效果良好;机械通风为2 m/s时,次卧、主卧、客厅的甲醛浓度分别降低了40.9%、37.3%、15.1%,客厅及两卧室甲醛浓度较低,厨房及卫生间略高。 相似文献
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为探明太阳能烟囱用于城市隧道自然通风及火灾排烟的效率,采用数值模拟方法,研究烟囱高度、空腔间隙、太阳辐照度和火源功率对通风与排烟效率的影响规律。研究得出:隧道自然通风速率随烟囱高度、空腔间隙和太阳辐照度增加而上升,烟囱高度每增加1.4 m通风速率提高17%,空腔间隙每增加0.5 m通风速率提升16%,太阳辐照度增加200 W/m2通风效率提高11%。太阳能烟囱用于排烟的效率优于传统竖井,烟囱高度对排烟效率的影响较小,排烟空腔间隙临界值为1.5 m。基于太阳能烟囱内横向非对称抛物线温度分布,提出烟囱出口体积流量预测模型。 相似文献
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简要分析了沁和能源集团永安煤矿通风系统的运行状况及其工作过程中存在的主要问题,基于存在的问题设计了2套优化改造方案。通过对比分析,采用方案一进行改造应用。实践结果表明,优化改进后的西井区巷道通风能力增强了,有效降低了矿井通风阻力,为该煤矿高效高产安全开采目标的实现奠定了基础。 相似文献
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矿井的通风设计是否合理关系到矿井是否能够安全生产、矿井未来的经济效益及矿井工作者的生命安全,因此要提高对矿井通风技术的重视。通过对矿井通风的重要性进行叙述,介绍了中国矿井通风技术的发展及方法,重点介绍了矿井通风的优化设计。 相似文献
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通风系统的设计关乎工作人员的生命安全,只有通风良好,保证矿井安全生产,才能保证煤矿井下的正常工作。基于此,分析了当前煤矿通风系统存在的问题,探讨了通风系统通风阻力的优化。 相似文献
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Experimental study for natural ventilation on a solar chimney 总被引:1,自引:0,他引:1
J. Arce M.J. Jimnez J.D. Guzmn M.R. Heras G. Alvarez J. Xamn 《Renewable Energy》2009,34(12):2928-2934
Thermal performance of a solar chimney for natural ventilation was experimentally investigated. The experimental model was implemented on full scale and real meteorological conditions, so that experimental results will be compared with the simulation results. The results show that for a maximum irradiance of 604 W/m2, occurring around 13:00 h on September 15th, 2007, a maximum air temperature increment of 7 °C was obtained through the solar chimney. Also, a volumetric air flow rate ranging from 50 to 374 m3/h was measured on that day. Thus, an average air flow rate of 177 m3/h was achieved from 0:00 h to 24:00 h. The experimental solar chimney discharge coefficient, Cd, was 0.52. This coefficient is useful to determine the mass flow rate in the solar chimney design. It was observed that the air flow rate through the solar chimney is influenced by a pressure difference between input and output, caused by thermal gradients and wind velocity, mainly. 相似文献
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The design of energy efficient buildings and the potential for using solar energy for heating and cooling is contingent upon optimizing the building ventilation systems. In this paper, we study the ventilation of two interconnected spaces, such as adjacent offices or areas in an open plan office. The goal is to locate return vents to increase the efficiency of night ventilation and to reduce energy consumption.The flow in two interconnected rooms of similar sizes is studied experimentally using a tank divided by an interior vertical wall. A forced buoyancy source with a finite volume flux is located in the ceiling of one-room and an unforced vent is opened in the ceiling of the other room. The goal of the study is to understand the transient cooling/heating that occurs in this two-room system when a forced cold-air vent is located in the ceiling of the first room and a return ventilation exit is located in the second. In particular, we investigate the effects of varying the number of openings and their vertical positions in the interconnecting wall. First, a single opening at the bottom, middle or top of the shared wall is examined. Second, the case of two openings in the wall is considered, with the openings located at the top–bottom, top–middle, bottom–middle, and finally at two mid locations in the wall. The results are compared with the one-room case, which represents the reference case.It was found that, irrespective of the number and locations of the openings, the flow evolves into a quasi-stationary stably stratified two-layer system, with the depths of the layers being different in each room. The average temperature inside each room initially decreases linearly with time and approaches the supply-air temperature at large times. This initial linear decrease holds until cold-air leaves the unforced room through the top-vent at time te. Subsequently, temperature decreases as an exponential function of time with a characteristic filling time τ = V/Qs, where V is the total volume of both rooms and Qs is the source volume flux. The efficiency of the ventilation depends on the time te, and this depends, in turn, on an exchange flow that is established between the two-rooms by the differences in density in each room. For a single opening, the exchange flow takes place as a two-way flow in the opening, while for two openings the flow is from the forced room through the lower opening and in the opposite direction through the upper opening.When the upper opening is located below the ceiling, this flow from the unforced room ‘shields’ the return vent from the dense fluid, thereby increasing the efficiency of the ventilation. 相似文献
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在矿井生产作业过程中,通风安全作为矿井作业持续有效开展的关键前提,其管理质量对整个矿井运行的有效性有重要意义.以此为着手点,针对通风安全管理策略开展分析,在分析矿井通风安全管理中存在问题的基础上,通过有关案例分析,对通风安全管理策略进行了深入探究,希望能够为其他矿井相似工程的开展提供借鉴和参考. 相似文献
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矿井通风系统担负为矿井持续供给新鲜空气、排出各类气体的重任。随着矿井开采深度和强度的增加,地质条件越加复杂,通风系统的优化改造成为重中之重。阳煤五矿原矿井通风方式为机械抽出式,采用中央并列式通风,回风井为回风斜井,它们共同担负通风任务。经验算,通风系统已无法满足矿井整合后的通风要求,需对矿井主通风设备进行升级,同时对各采区通风系统进行验算优化。 相似文献
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矿井通风系统的正常运行对于煤矿的安全生产具有重要意义。为了保证通风系统的安全高效运行,必须定期对矿井的通风系统进行优化。在优化矿井通风系统时,选择合适的优化方法十分重要。重点分析了通风系统的优化方法,主要包括矿井通风网络优化方法和矿井风机运行工况点优化方法,以期为煤矿通风工程的进行提供一定的参考。 相似文献