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结合既有建筑中央空调系统的设计方案及运行状况,对系统进行改造;在制冷机停止运行的基础上,在过渡季节和冬季利用冷却塔冷却冷冻水,以满足生产区域的供冷需求,从而实现节能。 相似文献
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《可再生能源》2017,(9):1411-1416
数据中心高能耗问题大大阻碍了信息产业的发展,自然冷源利用是实现数据中心节能降耗的关键技术手段。文章以数据中心自然冷源利用为研究对象,确定了蒸发冷却间接供冷方式下自然冷源利用临界湿球温度的推荐值;分析了全国主要气候区自然冷源利用潜力;提出了自然冷源利用敏感性的概念;以夏热冬暖地区某典型数据中心为例进行了自然冷源利用的节能效果分析。结果表明:数据中心自然冷源利用的临界湿球温度上限为16℃时,全国大部分地区的自然冷源可利用率超过50%;温和地区自然冷源敏感性最高;夏热冬暖地区数据中心利用自然冷源时,全年综合COP值可提高23.7%,节能率为19.2%。 相似文献
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本文介绍了利用电厂自身热力循环,实现了将12 MW抽凝发电机组改造成低背压发电机组.主要方法是:通过在低压缸排汽喉口部喷除盐水以适当降低凝汽器真空以提高凝结水温度,改凝汽器循环水冷却至冷却塔散热为用除盐水冷却,再用部分除盐水冷却冷渣器,凝结水和除盐冷却水全部作为锅炉补水送至除氧器,吸收了全部冷源损失为有用能.同时所属辅... 相似文献
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以上海某办公大楼设计为例,对其空调系统中的冷热源及系统进行了说明,分析其自然通风利用的可能性、采用热回收的经济效益,并对冷却塔免费供冷以及租户冷却水系统进行介绍,对设计过程中的难点问题进行总结。 相似文献
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如今,空调与制冷系统应用在各行各业中,夏季负荷侧通常需要7℃冷冻水.这一温度远远低于冷却水塔能够提供的水温32℃,因此就需要启动冷水机组制冷,典型的压缩式制冷空调系统如图1。 相似文献
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被动式供冷与辐射制冷技术 总被引:1,自引:0,他引:1
介绍了被动式供冷的原理以及被动式供冷系统的分类,特别介绍了其中新兴且日益发展的辐射供冷技术的原理及应用,指出被动式供冷是节能环保可持续发展的制冷技术,应大力开发使用。 相似文献
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A honeycomb porous microchannel cooling system for electronics cooling was proposed in this article. The design, fabrication, and test system configuration of the microchannel heat sink were summarized. Preliminary experimental investigation was conducted to understand the characteristics of heat transfer and cooling performance under steady single-phase flow. In the experiments, a brass microchannel heat sink was attached to a test heater with 8 cm2 area. The experimental results show that the cooling system is able to remove 18.2 W/cm2 of heat flux under 2.4 W pumping power, while the junction wall temperature is 48.3°C at the room temperature of 26°C. Extensive experiments in various operation conditions and parameters for the present cooling system were also conducted. The experimental results show that the present cooling system is able to perform heat dissipation well. 相似文献
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叙述了区域供冷系统的概念和优点,比较了区域供冷系统和分散式空调系统初投资及运行费用等的经济性。指出,区域供冷具有节能环保等优点,可以推广使用。 相似文献
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内冷油腔强制冷却是降低高强化柴油机活塞热负荷的有效方法,但内冷油腔冷却对冷却喷嘴及喷油有着较高的要求,本文通过介绍流体特性及内冷油腔活塞对喷油冷却的要求,简要阐述了冷却喷嘴设计注意事项及冷却喷嘴喷油试验情况。 相似文献
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A phase separation process model formed by the Cahn– Hilliard equation and the heat equation is considered. The mobility coefficient
in the Cahn–Hilliard equation is assumed to be an increasing function of the temperature. This property is of importance at
the latest stage of the cooling process. The existence and uniqueness of a weak solution is proved, and a uniform cooling
problem is studied. Obtained results can be used to control the cooling process and to create alloys with a uniform structure.
2000 Mathematics Subject Classification. 35K30, 35Q99, 49J20. 相似文献
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The existed combined power and cooling cycle operates with ammonia–water mixture as working fluid having low cooling due to the vapor at the inlet of evaporator. It also demands high ammonia concentration at turbine inlet to get cooling and suitable only at low sink temperature (10–12°C). A new cooling cogeneration cycle has been proposed and solved to generate more cooling with adequate power generation from single source of heat with two options in working fluids i.e. ammonia–water mixture and LiBr–water mixture. The results show that an increase in cycle maximum temperature is only supporting the power but not the cooling. A suitable range for separator temperature has been developed and optimized to maximize the total output. From this study, the resulted specific power, specific cooling, cycle power efficiency, cycle coefficient of performance (COP) and cycle energy utilization factor (EUF), plant EUF, and specific area of solar collector are 0.008 kW/m2, 0.11 kW/m2, 2%, 0.28, 0.3, 0.13 and 8 m2/kW for ammonia–water cycle and 0.04 kW/m2, 0.3 kW/m2, 9.5%, 0.7, 0.8, 0.37 and 3 m2/kW for LiBr–water mixture plant respectively. 相似文献