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一类活塞式二热源热泵的最优性能 总被引：1，自引：2，他引：1
研究了一类以理想气体为工质，热交换过程不可逆的活塞式二热源热泵，并设其中曲柄作匀速转动。导出热泵的基本优化关系，并应用它讨论了热泵的各种优化性能，获得了一些对热泵的优化设计和运行均有指导意义的新结论。此外，还强调了有限时间热力学的理论方法及其重要意义。 相似文献
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螺杆泵抽油系统比较复杂,很难通过电流变化准确发现螺杆泵井问题与故障。而有功功率对工况变化敏感,因此利用能耗曲线判断泵况和地面设备问题,判断井筒结蜡状况并延长热洗周期,改变了传统的单纯利用电流判断油井工作状况的方法,避免电流法在判断螺杆泵问题井和洗井效果方面的滞后问题。 相似文献
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分析了城镇供热中几个易混淆的概念,两台泵并联运行流量叠加是否损失了一部分;热媒设计温度与运行温度的差异;室内管径是不是越大越好;住宅每个房间的散热器片数跟房间面积有没有关系;循环水泵扬程与供热高度的关系;供热效果与压力压差的关系,闸阀、截止阀能否起调节作用。 相似文献
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邢台市污水处理厂一期工程采用的是土地处理法,它的一级处理产生的生污泥主要是通过污泥处理系统来完成的。它是污水处理厂所普遍采用的污泥处理系统。 相似文献
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应用流体力学中勃努利方程对喇380#中转站掺水热洗工艺流程的分析,确定管径、泵排量、泵压、运行电流之间关系。寻求在满足生产需要、系统平衡的前提下现有工艺流程中各段管网、机泵参数匹配最优设置,从而达到降低成本节能降耗最佳效果,同时也给老区改造中管网、机泵参数的重新确定提供有力参考依据。 相似文献
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通过介绍节能在空调系统中的具体运用和特点分析,使人们加深对空调系统中节能技术和节能设计标准的了解,倡导节能理念,推广节能技术。 相似文献
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本文针对投产时间较长的泵机组节电方法进行摸索实践,根据泵实际运行情况进行分析、对比、评价,在保证输送能力的前提下,进行不同的组合配比方式,确保各泵都能在最高工况区工作,不但节电效果明显,而且泵机组整体工作效率得到提高。对投产时间较长、能耗较大的泵机组摸索出一套可行性较高、节电效果理想、易于操作的节电方法。 相似文献
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This paper studies the stability of linear continuous-time systems with time-varying delay by employing new Lyapunov–Krasovskii functionals. Based on the new Lyapunov–Krasovskii functionals, more relaxed stability criteria are obtained. Firstly, in order to coordinate with the use of the third-order Bessel-Legendre inequality, a proper quadratic functional is constructed. Secondly, two couples of integral terms and are involved in the integral functionals and respectively, so that the coupling information between them can be fully utilized. Finally, two commonly-used numerical examples are given to demonstrate the effectiveness of the proposed method. 相似文献
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“M3”型单相交流电路实验板是根据电工学教学需要而设计制作的。“M3”型实验板有机地组织各个散件方式的单项实验器材,克服了散件方式实验的诸多弊端。“M3”型实验电路板布局简洁,结构牢固,造价低廉,使用安全便捷,线材损耗少,器材损坏率低。“M3”型实验电路板不仅能够完成“单相交流电路”的全部实验,还可以进行与“单相交流电路”有关的“日光灯电路”和“提高功率因数”的实验。在日常教学中,“M3”型实验电路板还可作为多种其它电路的教学示教板和实验板。用“M3”型实验电路板组织教学,采取“循序渐进”或“以‘实’带‘虚’”的方法,可以取得良好的教学效果。 相似文献
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Xingping Sheng 《Journal of The Franklin Institute》2018,355(10):4282-4297
The present work proposes a relaxed gradient based iterative (RGI) algorithm to find the solutions of coupled Sylvester matrix equations . It is proved that the proposed iterative method can obtain the solutions of the coupled Sylvester matrix equations for any initial matrices X0 and Y0. Next the RGI algorithm is extended to the generalized coupled Sylvester matrix equations of the form . Then, we compare their convergence rate and find RGI is faster than GI, which has maximum convergence rate, under an appropriative positive number ω and the same convergence factor µ1 and µ2. Finally, a numerical example is included to demonstrate that the introduced iterative algorithm is more efficient than the gradient based iterative (GI) algorithm of (Ding and Chen 2006) in speed, elapsed time and iterative steps. 相似文献
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Xiongping Dai Tingwen Huang Yu Huang Yi Luo Gang Wang Mingqing Xiao 《Journal of The Franklin Institute》2017,354(10):4126-4155
Given any finite family of real d-by-d nonsingular matrices by extending the well-known Li–Yorke chaos of a deterministic nonlinear dynamical system to a discrete-time linear inclusion or hybrid or switched system:
we study the chaotic dynamics of the state trajectory (xn(x0, σ))n ≥ 1 with initial state governed by a switching law . Two sufficient conditions are given so that for a “large” set of switching laws σ, there exhibits the scrambled dynamics as follows: for all This implies that there coexist positive, zero and negative Lyapunov exponents and that the trajectories (xn(x0, σ))n ≥ 1 are extremely sensitive to the initial states . We also show that a periodically stable linear inclusion system, which may be product unbounded, does not exhibit any such chaotic behavior. An explicit simple example shows the discontinuity of Lyapunov exponents with respect to the switching laws. 相似文献