共查询到19条相似文献,搜索用时 218 毫秒
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《暖通空调》2006,36(B12):26-27
2006年11月25日,国内著名制造业企业——美的集团在重庆基地正式下线国内第一台变频离心式冷水机组,在大型中央空调的高端领域,外资品牌独霸市场的局面将被打破。25日下午,美的中央空调组织了“变频离心式冷水机组”专家鉴定会,来自国内中央空调界权威专家,以及美的中央空调经销商代表、媒体代表100多人,一同见证了“美的变频离心式冷水机组”在重庆美的工厂下线。“美的变频离心式冷水机组”的各项性能指标,得到在场专家的认可和好评。专家组成员、中国制冷空调工业协会的杨炎如教授认为,作为国内惟一一家能够自主设计、研发和制造大型离心机的企业,“美的变频离心式冷水机组”达到了国际先进水平,在能源紧缺、关注“节能”的时代,填补了多项国内技术空白,对国内中央空调行业的技术创新和发展有重要的意义。 相似文献
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介绍变频制冷系统的节能原理及适用条件.基于不同冷冻水系统,不同类型制冷机组在不同工况下的能效、耗电量,分析了一次泵变流量冷冻水系统及变频离心式冷水机组在实际应用中的节能效果. 相似文献
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变频技术在离心式冷水机组上的应用 总被引:2,自引:0,他引:2
张伟 《建设科技(建设部)》2008,(12)
本文介绍了离心式冷水机组部分负荷的控制原理,特别介绍了约克变频驱动装置(VSD)应用于离心式冷水机组的控制原理,对变频装置的节能特性进行了分析,并介绍了变频装置的诸多特点。 相似文献
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针对多台不同制冷量冷水机组并联运行的情况,分析了影响系统能耗的各因素,结合实例对比了不同运行方案的能耗,提出了制定节能运行方案的方法。对冷水机组群控的逻辑判据进行分析,从兼顾节能效果和设备使用寿命的角度,提出了将节能运行方案与负荷变化趋势预测相结合的群控策略。 相似文献
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Air-cooled chillers are generally recognized as energy intensive equipment in air-conditioned buildings in the subtropical climate. This paper considers how the use of variable speed condenser fans enables these chillers to operate more efficiently. The thermodynamic model of an air-cooled screw chiller was developed using the simulation program TRNSYS and validated using the field data and specifications of the chiller. The staging of condenser fans and the control of their speed in various operating conditions were described. A comparison was made on the coefficient of performance of the chiller in the steady state with various control strategies: head pressure control with constant or variable speed condenser fans; condensing temperature control (CTC) with constant or variable speed condenser fans. Potential improvements in the chiller COP due to the use of CTC with variable speed condenser fans were discussed. The findings of this paper are useful in developing more energy efficient air-cooled chillers. 相似文献
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基于冷水量变化的冷水机组性能测试与故障诊断 总被引:1,自引:0,他引:1
研究了定流量/变温差和变流量/定温差条件下冷水量变化对机组性能的影响。结果表明:大型冷水机组蒸发器侧冷水大范围变流量不会影响系统的稳定性;在一定范围内冷水机组制冷量与冷水流量呈线性变化,系统的性能系数COP基本保持稳定,这为冷水泵的节能运行提供了良好的依据;蒸发器盘管中冷水流量较大时,允许的冷水流速变化范围可以适当增加;冷水量调节的极限速度为10.1%/min,否则会造成冷水机组运行不安全;蒸发器冷水流量变化引起的冷水机组性能变化可作为故障诊断的判断依据。 相似文献
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Air-cooled chillers are commonly used to provide cooling energy for air-conditioned buildings at the expense of considerable electricity. This paper examines the life cycle electricity cost of these chillers with the improved condenser features of condensing temperature control (CTC), evaporative pre-coolers (EC) and variable speed condenser fans (VSF). A validated model for an air-cooled screw chiller was used to ascertain how the individual and mixed features influence the annual electricity consumption of chillers in various operating conditions. It is estimated that the life cycle electricity cost savings range from HK$ 2,099,742 with EC to HK$ 6,399,564 with all the three features, with regard to a chiller plant serving an office building for 15 yr. The life cycle analysis reported here provides important insights into how to reap the benefits of energy efficient technologies for air-cooled chillers. 相似文献
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提出了基于模型的离心式制冷机系统台数优化控制策略。该优化控制策略充分利用机组系统的日常调试与制冷机组自身提供的可靠数据,采用简化模型来评估单台机的最大制冷量、计算单台机的瞬时制冷量、并且预测在一定负荷下不同台数机组运行时系统的总电功率,从而寻求制冷机台数的优化组合使得制冷机组系统性能系数最大化。 相似文献
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《Energy and Buildings》2005,37(7):739-746
This paper investigates how energy signatures can be used as an alternative to an energy use intensity (describing the annual electricity consumption of chillers in kWh per unit floor area of a building in m2) to assess the energy performance of chillers with various design options and operating strategies. An energy signature is a best-fit straight line relating chiller power to a climatic index when chillers operate for a building cooling load profile. Sixteen combinations of four design options and four operating strategies for chillers serving a hypothetical hotel are studied by simulation. For each combination, an energy signature for the chillers is determined. The slope and intercept of the energy signature can be used to accurately predict the annual electricity consumption of the chillers and to evaluate the extent to which this consumption can drop when chiller efficiency is improved. It is desirable to develop reference energy signatures in relation to different characteristics of building cooling load as a yardstick for the minimum requirement of chiller performance. With this yardstick, the effectiveness of energy efficient measures in the operation of chillers could be identified. 相似文献
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