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The optimum control strategy and the saving potential of all variable chiller plant under the conditions of changing building
cooling load and cooling water supply temperature were investigated. Based on a simulation model of water source chiller plant
established in dynamic transient simulation program (TRNSYS), the four-variable quadratic orthogonal regression experiments
were carried out by taking cooling load, cooling water supply temperature, cooling water flow rate and chilled water flow
rate as variables, and the fitting formulas expressing the relationships between the total energy consumption of chiller plant
with the four selected parameters was obtained. With the SAS statistical software and MATHEMATICA mathematical software, the
optimal chilled water flow rate and cooling water flow rate which result in the minimum total energy consumption were determined
under continuously varying cooling load and cooling water supply temperature. With regard to a chiller plant serving an office
building in Shanghai, the total energy consumptions under different control strategies were computed in terms of the forecasting
function of cooling load and water source temperature. The results show that applying the optimal control strategy to the
chiller plant can bring a saving of 23.27% in power compared with the corresponding conventional variable speed plant, indicating
that the optimal control strategy can improve the energy efficiency of chiller plant. 相似文献
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采用响应面分析法建立了集中空调水系统总能效与冷负荷率、室外干球温度、冷却塔风机风量、冷水流量和冷却水流量的五元二次经验模型,得到了当负荷率和干球温度动态变化时,使制冷系统总能效最高的风机风量、冷水流量和冷却水流量,从而得到了冷却塔风机、冷却水泵、冷水泵和制冷主机的功率调节方案.结果表明,协同变流量控制能有效提高空调系统的总能效. 相似文献
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以NBR为基体材料,以压电陶瓷为功能相制备压电橡胶复合材料,并对其压电与吸声性能进行研究.结果表明,复合材料的压电常数(d33)随压电陶瓷用量的增大而增大,当压电陶瓷用量为5210份时,d33达到3.1×10-11C·N-1,并随着极化时间的延长而增大,随着极化温度的升高先增大后减小,且最佳极化时间为25min,最佳极化温度为80℃.压电橡胶复合材料的吸声因数在2~3 kHz的频率内随着复合材料压电常数的增大而增大,碳纤维的加入使复合材料内部形成了一定的导电网络,提高了复合材料的吸声因数. 相似文献
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为了提高制冷机房部分负荷下的运行效率,对主要参数影响制冷机房总功率的基本规律进行了研究。通过在TRNSYS软件上建立制冷机房仿真平台,以负荷率、冷冻水流量、冷冻水供水温度、冷却水流量和冷却水进水温度为参数,采用降维分析法,得到了五个参数影响制冷机房总功率的变化规律和影响程度的主次顺序。结果表明,不同参数对制冷机房总功率的影响程度不同,同一参数在不同其它参数条件下,其影响力将有所变化;不同工况下,均存在最佳冷冻水流量值和冷却水流量值使制冷机房总功率最小,且最佳流量值随工况条件而动态变化。 相似文献
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改进光纤PMD的光纤旋转技术 总被引:1,自引:1,他引:1
分析了偏振模色散(PMD)及其不稳定性对系统传输距离与传输速率的影响.介绍了光纤旋转技术,采用正弦旋转技术可有效降低光纤的双折射并增加模式耦合.研究了采用正弦旋转技术制备的旋转光纤的PMD稳定性,旋转光纤成缆后的PMD典型值可控制在0.04 ps/km,与非旋转光纤相比,旋转光纤的PMD具有很好的温度稳定性与成缆稳定性. 相似文献
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