【摘 要】
：
In the present study,the thermodynamic and economic performance of a combined thermodynamic cycle formed by an ORC and a Kalina cycle,which can simultaneously recover waste heat of exhaust gas and cooling water of marine engine,has been analyzed.Two typic
【机 构】
：
MOE key laboratory of enhanced heat transfer and energy conservation,Beijing University of Technolog
论文部分内容阅读
In the present study,the thermodynamic and economic performance of a combined thermodynamic cycle formed by an ORC and a Kalina cycle,which can simultaneously recover waste heat of exhaust gas and cooling water of marine engine,has been analyzed.Two typical marine engines are selected to be the waste heat source.Six economic indicators are used to analyze the economic performance of this combined thermodynamic cycle system with different marine engine load and under practical comprehensive operating condition of marine engine.The results of the present study show that the combined thermodynamic cycle system with R123 as organic working fluid has the best performance.The system with cis-butene has the worst economic performance.Under practical comprehensive operating conditions of ships,R123 has the shortest Payback Periods,which are 8.51 years and 8.14 years for 8S70ME-C10.5 engine and 5G95ME-C10.5 engine,respectively.Correspondingly,payback Periods of Cyclopentane are 11.95 years and 11.90 years.The above values are much shorter than 25 years which are the lifetime of a marine ship.Under practical comprehensive operating conditions of ships,the combined cycle system can provide output power which is at least equivalent to 25％of engine power.Considering that R123 will be phased out in near future,cyclopentane may be its good successor.Cyclopentane can be used safely by correct handling and installing according to manufacturer\'s instructions.
其他文献
To overcome the defect of the significant increase in pressure drop when the heat transfer performance of helical baffle heat exchanger is improved,a novel helical baffle heat exchanger with twisted oval tube is proposed.Numerical simulation was done to e
基于对193名企业员工的问卷调查,探讨高承诺人力资源管理对员工离职倾向的影响,以及工作嵌入的中介作用.研究结果表明:高承诺人力资源管理对员工离职倾向具有显著的负向影响,工作嵌入在高承诺人力资源管理与员工离职倾向的关系中发挥着部分中介作用.
我国是世界上遭受海洋灾害最为严重的国家之一.在全球气候变暖背景下,台风、暴雨等极端大气天气事件频发,酸化、低氧等极端海洋生态事件增多,海洋灾害成为人类社会未来面临的重大自然灾害风险.对各类极端天气气候和海洋极端事件做到早期发现、准确识别、精准预报,是各国的共识.经过几十年的发展,我国海洋与大气观测能力和数值预报水平已经有了长足进步,基本形成“观测—追踪—预测”链条式的海洋灾害预警服务与保障体系.
本文主要针对智慧视频对接建设中不需要安装任何插件进行视频图像调阅的需求,提出一种直播协议对接解决方案.该方案采用基于HTTP的自适应码率直播协议(HTTP live streaming,HLS),结合HLS直播协议的主流厂家支持、穿透防火墙、性能高等优势,提供安全可靠的直播流服务.基于HLS协议,不需要安装任何插件,手机终端和个人计算机(personal com-puter,PC)终端通过浏览器就可以实现对视频图像的调阅.在广州视频接入云平台项目的建设中,该技术实现了明厨亮灶APP、AI算法模块等视频图像
本文就如何构建中小型软件企业软件项目风险管理体系进行研究,首先简要介绍风险管理的基本概念,以及中小型软件企业项目风险管理的基本特点;其次详细介绍适合中小型软件企业开展项目风险管理的方法,重点阐述风险识别、分析评估、制定应对措施的过程;最后提出中小型软件企业构建软件项目风险管理体系步骤的建议.
Compared with the pure fluids,the zeotropic mixtures can balance the requirements of environmental protection,heat source matching and system safety,and exhibit excellent thermodynamic performance.However,compared to the widespread applications of pure fl
An adsorption refrigeration system can be driven by low grade heat and uses natural refrigerant with the advantage of reducing the greenhouse gases emission.However,one of the weaknesses is its low efficiency and more importantly its high cost.The recover
近年来,IPv4地址资源紧缺问题日益凸显,而IPv6能够提供海量的网络地址资源,是实现万物互联,促进铁路运行和维护数字化、网络化、智能化发展的关键要素.发展基于IPv6的下一代铁路数据通信网,不仅是铁路数据通信网演进升级的必然趋势,更是助力基础网络与智能铁路深度融合、支撑智能铁路高质量发展的迫切需要.本文重点探讨了在铁路数据通信网IPv6建设过程中便捷实现IPv6网络环境下SRv6 VPN与既有IPv4网络环境MPLS/BGP VPN互联互通的方案.
Night ventilation is regarded as a promising cooling strategy by storing night cooling in the thermal mass of the building.However,night ventilation performance in hot summer is restricted by the climatic limits.In this paper,we propose a new solution as
为了解决高空飞行器远距离通信相关问题,本文提出基于定向天线宽窄波束切换的移动自组网方案,在高空高动态远距离飞行器通信中具有广泛的应用前景,证明了节点间的通信建链具有重要的工程意义.从工程需求出发,通过计算、仿真和工程设计,研究和验证了定向天线宽窄波束的方法,在高动态飞行器自组网中具有现实指导意义.