共查询到19条相似文献,搜索用时 250 毫秒
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通过试验研究的方法,将自然冷源引入冷藏陈列柜,在完全利用室外冷源对陈列柜柜内进行供冷的运行模式下,保持风幕送风速度为1.1m/s,室外送风温、湿度分别为1.0℃、60%,室内湿度为60%不变,调节室内不同的温度,观察柜内食品包温度变化分布,研究陈列柜食品包冷藏特性。实验结果表明:与利用制冷系统供冷的传统陈列柜相比,自然冷源供冷使柜内温度分布均匀性得到很大提升,自然冷源陈列柜1~5层同侧食品包温差不超过1.5℃,但是每层内侧和外侧食品包温差在2.5~3.0℃。在此送风条件下,保证室内温度在22.0℃以下可以满足柜内食品贮藏温度0.0~7.0℃的要求。风幕参数变化规律:随着食品包前端距离的增加相对湿度呈现先增大后减小,最后稳定于和室内湿度相等的趋势。风速和温度呈逐渐减小的趋势,且变化速率不断减小。 相似文献
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随着大型超市的不断发展,陈列柜的使用量越来越大,陈列柜的节能也越来越重要。采用雷诺应力模型对某型卧式陈列柜的温度场和湿度场进行了仿真计算和实验验证;并通过实验的手段,对环境湿度对卧式陈列柜热负荷的影响进行了研究。 相似文献
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环境湿度对卧式陈列柜热负荷影响的数值分析 总被引:1,自引:0,他引:1
随着大型超市的不断发展,陈列柜的使用量越来越大,陈列柜的节能也越来越重要。采用雷诺应力模型对某型卧式陈列柜的温度场和湿度场进行了仿真计算和实验验证;并通过实验的手段,对环境湿度对卧式陈列柜热负荷的影响进行了研究。 相似文献
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介绍了某半导体制造项目净化空调系统中FFU送风方式,并与传统集中送风方式相比,分析其优缺点。该送风方式已在微电子工业洁净厂房得到越来越多的应用。 相似文献
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汽车站是有代表性的大空间建筑,其空调设计日益受到人们的关注。介绍车站大空间项目空调设计的特点,通过对气流组织的分析,比较几种送风方式的优缺点。结合临邑汽车站在喷口送风的应用,通过分析喷口送风与其他送风方式的节能效果,探究喷口侧送形式在大空间应用状况及优势。 相似文献
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保证室内空气品质的置换通风的节能研究 总被引:1,自引:0,他引:1
介绍了置换通风的原理及其能够改善室内空气品质的原因,运用送风量及送风温度的公式,对置换通风及混合通风进行了计算比较。通过具体工程实例的计算表明:置换通风其送风量比混合通风的送风量减少16.7%,节约能耗41%,新风节能2.46W,是一种能改善室内空气品质的节能方法。 相似文献
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M. Khamis Mansour Md Nor Musa Mat Nawi Wan Hassan Khalid M. Saqr 《Energy Conversion and Management》2008,49(6):1455-1468
A novel control strategy to improve energy efficiency and to enhance passengers’ thermal comfort of a new roof top bus multiple circuit air conditioning (AC) system operating on partial load conditions is presented. A novel strategy for automatic control of the AC system was developed based on numerous experimental test runs at various operating conditions, taking into account energy saving and thermal comfort without sacrificing the proper cycling rate of the system compressor. For this task, more than 50 test runs were conducted at different set point temperatures of 21, 22 and 23 °C. Fanger’s method was used to evaluate passenger thermal comfort, and the system energy consumption was also calculated. A performance comparison between that of the conventional AC system and that of the newly developed one has been conducted. The comparison revealed that the adopted control strategy introduces significant improvements in terms of thermal comfort and energy saving on various partial load conditions. Potential energy saving of up to 31.6% could be achieved. This results in a short payback period of 17 months. It was found from the economic analysis that the new system is able to save approximately 20.0% of the life cycle cost. 相似文献
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介绍了青岛某别墅的空调和热水供应系统的方案设计.设计方案把地源热泵技术用于住宅的空气调节、卫生热水供应和游泳池补水供水,还采用了辐射供暖与辐射供冷等节能新技术.文章详细介绍了系统流程、特点、工作原理和设计参数的选取等. 相似文献
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我国能源科技发展思路 总被引:4,自引:0,他引:4
能源是国民经济和社会发展的不可缺少的生产要素和物质基础。当前我国正处在工业化过程中,能源科技的发展将强有力的支撑国家能源安全。我国已成为世界能源生产和消费大国,预测2020年中国一次能源的需求为29亿tce,有可能继续实现能源翻一番,GDP翻两番。根据我国资源情况及国内外形势,笔者提出"节能优先,以煤为主,保障安全,多元发展"的可持续发展能源战略。能源科技发展的思路主要包括:要坚决贯彻节能优先的方针,加强煤炭的清洁、高效开发与利用研究,加强以油气为主的能源安全保障体系研究,实施多元化科技发展战略。据此战略思路,最后笔者尝试性的提出能源科技方面重点研究方向。 相似文献
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ABSTRACTLong-term performance of room air conditioners (RAC) is an important evaluation index to estimate RAC actual energy conservation efficiency. The environmental condition change and long-term use will result in degradation of RAC performance, which increases energy consumption. To solve the problem, an optimization method was proposed. The operating data was collected by a RAC online monitoring system. The hidden relationship among operating parameters was discovered by data mining method, and then an artificial neural network prediction model was developed. After training, this model had been validated to be effective in predicting energy efficiency ratio (EER) with absolute fraction of variance of 0.990 and root mean square error of 0.291. Moreover, the prediction results of return air temperature, relative humidity and EER agreed well with measured values. Based on the prediction results and historical operating database, an optimal control strategy was proposed to improve the operating performance of RAC. By applying the control strategy the energy saving rate was theoretically about 9% in the stable operation case and 2.61% in all actual operating period. 相似文献
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