共查询到12条相似文献,搜索用时 46 毫秒
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环境试验室围护结构和材质的合理选用,直接影响制冷和加热设备容量,投资的大小以及运行费用的高低。本文根据计算机模拟计算结果,对该技术问题进行了分析探讨,可供环境试验室热工设计参考。 相似文献
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本文结合湿热环境试验的特点,对湿热环境试验室加湿方式选择原则属种加湿方式的特点和适用条件进行了分析,对于进行工程计有一定的参考价值。 相似文献
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主要论述了离心式制冷设备的性能特点,制冷量的调节方法,其制冷压机对汽体作功消耗因素,并阐明了离心式制冷机对制冷工质的特殊要求。 相似文献
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本文以气候环境试验方法对试验参数的要求为出发点,提出气候环境试验设备性能确认的原则。同时,扼要介绍气候环境试验设备性能确认相关标准的一些问题。 相似文献
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Guihua Zhu Feng Jiang Dongyang Tan Jisheng Zhang Ying Zhao 《International Journal of Green Energy》2018,15(2):106-112
In this research, desert sand is used as the sensible heat storage medium, which exchanges heat with air in the downcomer to realize heat storage and heat release. The desert sand distribution uniformity has a significant impact on the heat exchange performance and efficiency between desert sand and air for the process of convection in the downcomer. Given the superiority of sensible heat storage in convective heat transfer between desert sand and air, distributors with cylinder or conical bore solid particles and homogeneity performance testing device are designed and manufactured on the basis of convection system equipped with solid particle–air downcomer. Then, the convection experiment between solid sand and air is researched. The greater the desert sand flow rate and higher the volume density, the larger the variance of regional mass flow rate and the worse the homogeneity performance. For the cylinder bore distributor, the smaller the sand particle size is, the greater affected the sand groups can be. The sand homogeneity performance is preferable with the two particle size ranges: 0.18-0.25 mm and 0.15-0.18 mm. The total sand flow rate decreases, but the uniformity improves with the increase of the air flow velocity, and the best distribution performance is achieved at an air velocity of 0.6 m/s. However, the distribution performance declines with the air flow velocity persistently increasing because the sand groups are pushed to one pipe side close to the wall. The sand groups deflect seriously with the air flow velocity increasing. 相似文献