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冷水机组是空调系统的重要部件,分析了冷水机组的选择依据,介绍了冷水机组的选型计算原则、台数及容量确定,比较了不同类型冷水机组的运行调节特点,得出各种形式机组的适用条件,为空调工程的冷水机组选择提供了一定的借鉴。 相似文献
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本文针对冷水机组能耗模型参数辨识过程及冷水机组的渐变性及突变性,提出了冷水机组能耗模型参数的自适应在线辨识方法。首先,根据冷水机组能耗模型参数的变化情况建立了冷水机组的遗忘因子自适应模型,介绍了冷水机组能耗模型的递推最小二乘格式。而后,以某酒店离心式冷水机组为例对冷水机组能耗模型参数的辨识方法进行了实例分析。结果表明,变遗忘因子的自适应在线辨识方法在辨识过程中能够适应冷水机组能耗模型时变性的需求,提高了冷水机组能耗模型在系统渐变和突变过程中的辨识精度,为进一步的冷水机组在线运行优化控制及故障诊断提供了参考。 相似文献
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对变频离心式冷水机组全年节电的探讨 总被引:1,自引:1,他引:0
介绍了变频离心式冷水机组节能的原理及适用条件。基于冷水机组的全年耗电量是冷水机组在不同运行时段内的机组能效、机组负荷与运行时间乘积之和,分析了1台变频离心式冷水机组在单台和多台机组中应用的节电效果。 相似文献
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邱育群 《建筑热能通风空调》2019,38(9)
针对螺杆冷水机组高精度和低成本两者无法同时兼顾的的问题,对螺杆冷水机组的控制方法进行试验研究,解决了现有螺杆冷水机组控制技术中高精度和低成本无法同时兼顾的难题。在实现螺杆冷水机组低成本、高可靠性的同时,实现了被控水温精度高达±0.3℃的高精度。 相似文献
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磁悬浮离心式冷水机组已在国内外诸多空调工程中应用,因其性能系数高,大大降低了冷水机组的全年能耗。分析了该类型冷水机组在国内的应用现状,指出作为一种冷水机组产品,应执行现有的相关国家标准,同时应参考国外标准;建议深入理解国内外标准中名义工况下的COP、综合部分负荷性能系数IPLV和非标准工况下综合部分负荷性能系数NPLV,正确评价磁悬浮离心式冷水机组的性能。工程实例计算结果表明,磁悬浮离心式冷水机组与普通离心式冷水机组相比,全年可减少能耗40%左右,其名义工况下的COP达到国家冷水机组1级能效等级,其IPLV超过8.7。认为其独有的特性将改变部分空调系统的传统设计方法,值得深入研究,磁悬浮离心式冷水机组是一种值得大力推广的高效节能产品。 相似文献
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基于建筑全年动态冷负荷的冷水机组优化配置方案 总被引:3,自引:1,他引:2
提出一种在设计阶段对冷水机组方案进行优化配置的方法.首先,冷水机组的能耗计算简化为制冷机的实际制冷量和冷却水进口温度两个独立变量的函数.进一步,通过建筑动态负荷计算获得全年冷负荷频率特性以及相应的室外湿球温度分布,其中湿球温度决定了冷却水最低进口温度.最终,计算出各种冷水机组配置方案的全年以及不同冷负荷需求工况下的运行电耗,并得出最优化的节能方案. 相似文献
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关于风冷和水冷冷水机组的耗电量问题 总被引:3,自引:0,他引:3
认为比较两者的耗电量应明确机组装机容量与耗电量的区别及负荷分布机组效率和耗电量的影响。经比较得出,风冷机组耗电并不比水冷机组高多少,且其总运行费用可能还略低于后者。 相似文献
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Economic benefits of optimal control for water-cooled chiller systems serving hotels in a subtropical climate 总被引:2,自引:0,他引:2
A water-cooled chiller system in an air-conditioned hotel can take up about one-quarter of the total electricity consumption and considerable amounts of water in the heat rejection process. This paper evaluates operating cost savings of a chiller system integrated with optimal control of cooling towers and condenser water pumps. A sophisticated chiller system model was used to ascertain how different control methods influence the annual electricity and water consumption of chillers operating for the cooling load profile of a reference hotel. It is estimated that applying load-based speed control to the cooling tower fans and condenser water pumps could reduce the annual system electricity use by 8.6% and operating cost by 9.9% relative to the equivalent system using constant speed fans and pumps with a fixed set point of 29.4 °C for cooling water temperature control. The ways to implement this advanced control for system optimization are discussed. 相似文献
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冷却水系统变流量的全年工况节能分析 总被引:1,自引:1,他引:0
本文对变流量时冷却水系统的节能效果进行了分析。首先以冷却变频水泵调速引起冷水机组和水泵系统的全年节能量的变化为优化目标函数,分析了变流量时不同控制方式对水泵和机组能耗的影响。而后建立了冷却水变流量时系统的节能优化模型,并应用实例进行分析,计算得出了不同控制方式下冷却水系统全年以及不同负荷率工况下的运行能耗,在此基础上得到了最优化的控制方法。研究结果表明:冷却水系统采用变流量是可行的,系统综合节能效果显著;定温差+最小压差控制是相对节能的变流量控制方式,同定流量控制比较,系统全年节能率为6.07%。 相似文献
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《Energy and Buildings》2005,37(4):353-360
A computational model for determining annual periodic performance of a cooling system utilizing a ground coupled chiller and a spherical underground thermal energy storage tank is developed. An analytical solution for the transient heat transfer problem outside the storage tank is obtained by the application of complex finite Fourier transform (CFFT) technique. Analytical expressions for heat gain to the space and energy consumption of the chiller are acquired, and these expressions are coupled with the transient temperature field problem to obtain computational model. Variation of water temperature in the storage tank is calculated using the transient solution of the problem over an entire year for different soil, chiller, and storage tank characteristics. Temperature profile of earth surrounding the storage tank and the COP of the cooling unit are also investigated under various assumptions and varying system design and operating conditions. The results show that water temperature in the storage tank remains under ambient air temperature during summer months, and thus the proposed ground coupled cooling system should yield higher COP values compared to a corresponding air source system. 相似文献
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This paper treats energy and cost performance of a cooling source system with indirect seawater utilization for air conditioning in a commercial complex. Seawater utilization has merits as a cooling source, because seawater temperature is lower than outdoor air in summer and it is cost effective because there is no water monetary cost. Actual operating data has been measured for about 2 years and the chiller and system co-efficient of performance (COP) have indicated about 4.77 and 2.93, respectively, even in summer season and the mean efficiency of the thermal storage system was about 89.9% taking into account heat loss of pumps. In addition, we have constructed simulation models for cooling tower systems, air cooling chiller systems and direct seawater utilization systems then compared them to this system. The electric power consumption of the indirect seawater utilization system was almost the same as the other systems except the air cooling chiller system, because using lower seawater temperature made the chiller efficiency higher. In conclusion, our results showed the indirect seawater utilization system was able to improve the system COP compared to air cooling chiller system, and cancel water consumption compared with the cooling tower system, and cut down an initial and maintenance costs compared with the direct seawater utilization system. 相似文献