排序方式: 共有55条查询结果,搜索用时 15 毫秒
1.
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
2.
3.
4.
本文以扇贝为研究对象,采用二次正交回归组合试验,建立了真空冷冻干燥升华时间和单位厚度升华时间的二次多元回归模型,利用降维法分析了干燥室压强、物料厚度和加热板温度三个主要过程参数对真空冷冻升华干燥时间的影响。结果表明,干燥室压强、物料厚度和加热板温度对升华干燥时间影响显著,呈二次函数规律变化,影响的主次因素依次为:物料厚度、干燥室压强、加热板温度。对单位厚度升华干燥时间进行岭嵴分析,给出了在本试验三因素取值范围内的冻干过程优化参数:干燥室压强为50Pa;物料厚度为9mm;加热板温度为39℃,优化的物料单位厚度升华干燥时间为0.146h。 相似文献
5.
6.
针对多机器人同步定位与建图(MSLAM)中感知偏差会产生高度相关且互一致的异常回环,进而导致定位与地图变形等问题,提出了基于马尔可夫随机场(MRF)的通用连续-离散图模型.其中,连续图对标准位姿图(pose graph)进行建模;离散图通过对异常值相关关系的显式建模,建立剔除模型.在此基础上,进一步利用凸松弛方法,将连续-离散图代表的非凸且NP(非确定性多项式)完全的组合优化问题转化为半正定规划(SDP)问题,方便利用现有凸优化工具进行求解.仿真和实测数据实验表明,本文方法提高了位姿图对感知偏差带来异常外点的鲁棒性,且结果不依赖于位姿初始值的好坏,在异常值占比为50%的情况下,剔除率仍可达99.8%,地图融合精度优于现有主流动态协方差缩放(DCS)方法和两两一致测量集(PCM)方法. 相似文献
7.
8.
9.
10.
泠冻对文蛤和波纹巴非蛤组织结构影响的初步研究 总被引:2,自引:0,他引:2
利用IMP测温系统及组织切片技术,分别对文蛤和波纹巴非蛤蛤肉在三种冻结方式:-196℃(液氮)、-78℃(干冰)、-18℃(冰箱)中的冻结过程特别是组织结构变化进行了研究。实验结果表明:液氮冻结对蛤肉组织结构的影响最小:对于文蛤是较好冷冻方式,但对波纹巴非蛤却不是最佳的:干冰冻结使组织结构产生的冰晶较为均匀,变形程度次之。冰箱冷冻则使得组织结构严重变形。由此可以认为文蛤是冷冻速率越大、冻结终温越低,冷冻效果越好:而波纹巴非蛤并非如此,它最佳冷冻条件应该处于干冰冷冻和液氮冷冻条件之间。 相似文献