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利用CFD数值模拟的方式分析冷辐射吊项(CRCP)+独立新风(DOAS)空调系统的热工性能,与传统的全空气系统(VAV)不同的是,这种新型空调系统采用直接辐射和间接对流的方式来消除室内的热负荷,冷辐射吊顶通过直接辐射和间接对流来承担室内的部分显热负荷,独立新风承接室内的全部潜热负荷与部分显热负荷。以上海某居室为例,分析了冷辐射员顶和独立新风空调系统的原理,并建立了居室的物理模型与数学模型,利用CFD软件模拟了居室内的气流组织,分析了速度场与温度场的分布特征,并对室内热舒适性进行了模拟,并采用PMV—PPD指标对室内热舒适性进行了评价。模拟结果显示,这种新型空调系统能提供较好的热舒适环境和较高的空气品质。 相似文献
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介绍了乌鲁木齐高铁新区综合医院建筑物概况、当地气候特点及空调系统形式,分别介绍了冬季和夏季工况空调冷水机组系统及末端风机盘管系统、新风系统、地板辐射供冷供暖系统的选择情况及各项设计冷负荷、热负荷的分配情况。 相似文献
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某住宅采用地埋管地源热泵为冷热源,以毛细管辐射和地板送风为空调末端,从空调冷热负荷、冷热源、地埋管换热系统、空调水系统、新风系统、末端设计与控制等方面展示了本项目的设计,为以后类似项目设计提供了参考。 相似文献
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用谐波反应法计算空调负荷应注意的问题 总被引:1,自引:0,他引:1
认为与反应系数法相比,利用谐波反应法计算空调负荷简便,但在计算中应注意辐射得热中稳定得热形成的冷负荷的计算及谐波阶数的选取问题。结合计算实例,给出了由稳定辐射得热计算冷负荷的新的计算公式,以及在实际计算中应取的谐波阶数。 相似文献
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本文从空调冷负荷计算的原理与特点、空调冷负荷计算的基础理论、负荷计算软件的开发与改进、间歇空调系统冷负荷的计算和不同软件之间的比对与分析5个方面回顾了空调冷负荷计算理论研究的研究成果. 相似文献
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A study was carried out to investigate the effect of heat-pipe air-handling coil on energy consumption in a central air-conditioning system with return air. Taking an office building as an example, the study shows that compared with conventional central air-conditioning system with return air, the heat-pipe air-conditioning system can save cooling and reheating energy. In the usual range of 22–26 °C indoor design temperature and 50% relative humidity, the RES (rate of energy saving) in this office building investigated is 23.5–25.7% for cooling load and 38.1–40.9% for total energy consumption. The RES of the heat-pipe air-conditioning system increases with the increase of indoor design temperature and the decrease of indoor relative humidity. The influence of indoor relative humidity on RES is much greater than the influence of the indoor design temperature. The study indicates that a central air-conditioning system can significantly reduce its energy consumption and improve both the indoor thermal comfort and air quality when a heat-pipe air-handling coil is employed in the air-conditioning process. 相似文献
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Telecommunication base station (TBS) has high indoor IT heat dissipation rate, and cooling load exists almost all year around. Energy consumption of air-conditioning system is 30–50% of the TBS entire energy. Envelope and heat pipe assisted air-conditioning system performances are investigated using annual hourly simulation software. In cold city Harbin, high insulation envelope is recommended to avoid heating requirement in winter; and in warm city Guangzhou, low insulation envelope is recommended to reduce the annual cooling load. Shading and roof ventilation have little impact on the reduction of cooling load. Simplified analysis method based on daily average steady values is proposed, which can reveal the main performance influencing factors and clearly direct the main approach in energy saving. The simplified method can accord well with numerical results and tested results available in literature. Contribution of each heat source can be clearly gained and analyzed, solar radiation does not possess large effect in TBS. Ideal thermal resistance with no heating or cooling requirement is then derived, envelope can be easily optimized and contribution of such kind of outdoor cooling source method using heat pipe can be easily obtained. 相似文献
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以采用一次回风集中空调系统的办公建筑为例,就室内温、湿度设计参数对空调房间热舒适环境和空调系统能耗的影响进行了分析。研究结果表明,在同样的室内人体热舒适环境(等效温度)的条件下,随着室内温度的增加,一次回风系统的需冷量和总的耗能量是增加的。因此,夏季提高空调室内温度是不节能的。在相同热舒适(等效温度)条件下,要减少空调系统的冷负荷,室内设计温、湿度参数在推荐的热舒适区范围内,宜采用较大的室内相对湿度和较低的室内干球温度的组合,或采用较高的等效温度。 相似文献
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杨素云 《建筑热能通风空调》2000,19(3):48-50
针对夏季多层建设空调冷负荷的计算问题,经三个地区同一实例的负荷计算,提出了切合垢建筑设计指标取值方法和建筑的冷负荷与制冷量的区别,供设计者参考。 相似文献
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某高大空间厂房分层空调系统节能设计 总被引:1,自引:0,他引:1
结合工程实际介绍了高大空间厂房中央空调系统的节能设计方法。特别就高大空间分层空调系统的冷负荷计算与气流组织的设计计算做了具体的阐述。 相似文献
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浅谈地铁车站公共区通风空调系统设计 总被引:2,自引:1,他引:1
以屏蔽门系统的车站为例,从公共区的冷负荷、湿负荷构成以及公共区通风空调系统设计等方面进行了阐述分析,并给出了相应的计算公式,从而使通风空调系统设计更加完善。 相似文献
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《Energy and Buildings》2005,37(5):443-449
This paper evaluates the performance of a personalized air-conditioning system, namely an innovative partition-type fan-coil unit (PFCU), against that of a central air-conditioning system, in terms of their thermal comfort provided and cooling energy consumed. For a cooling load given, it is found that the thermal comfort index (PMV) resulted from the personalized system is always lower than that from a central system. Also, the PMV-curve of the personalized system responds to the loads faster. The experimental results indicate that the personalized system, as compared to the central system, can shorten the operation time for the same level of thermal comfort required and save up to 45% of the energy consumed by the central system. As regards thermal comfort, the experiment with a thermal manikin substrates the PFCU design for its considerable reduction of the cold draft. 相似文献
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区域建筑群负荷预测是能源站系统容量配置的基础,在研究区域建筑负荷预测方法的基础上,运用软件模拟与情景分析相结合的方法,预测上海某商务区能源站供能区域建筑群空调冷、热负荷,进而预测能源站的空调负荷,并对入住率进行情景分析,计算不同入住率下的系统容量,为能源站系统容量配置提供基础数据。 相似文献