Variable mass energy transformation and storage (VMETS) system using NH3–H2O as working fluid, Part 1: Modeling and simulation under full storage strategy

2007 ◽  
Vol 48 (1) ◽  
pp. 9-26 ◽  
Author(s):  
S.M. Xu ◽  
L. Zhang ◽  
J. Liang ◽  
R. Du
Keyword(s):  
Modeling And Simulation ◽  
Variable Mass ◽  
Working Fluid ◽  
Mass Energy ◽  
Energy Transformation ◽  
And Storage

Optimization of Wettability Gradient for Enhancement of Thermal Performance of Micro Heat Pipes

2018 ◽  
Author(s):  
Manjinder Singh ◽  
Naresh Varma Datla ◽  
Supreet Singh Bahga ◽  
Sasidhar Kondaraju
Keyword(s):  
Heat Transfer ◽  
Thermal Performance ◽  
Variable Mass ◽  
Working Fluid ◽  
Maximum Heat ◽  
Continuous Increase ◽  
Maximum Heat Transfer ◽  
Integration Density ◽  
Heat Transfer Capacity ◽  
Micro Heat Pipes

Continuous increase in the integration density of microelectronic units necessitates the use of MHPs with enhanced thermal performance. Recently, the use of wettability gradients have been shown to enhance the heat transfer capacity of MHPs. In this paper, we present an optimization of axial wettability gradient to maximize the heat transfer capacity of the MHP. We use an experimentally validated mathematical model and interior point method to optimize the wettability gradient. For our analysis, we consider two cases wherein (i) the mass of working fluid is constrained, (ii) mass of working fluid is a design variable. Compared to MHP with uniform high wettability and filled with a fixed mass of working fluid, optimization of the wettability gradient leads to 65% enhancement in heat transfer capacity. Similar comparisons for MHP filled with variable mass of working fluid shows more than 90% increase in the maximum heat transfer capacity due to optimization of wettability gradient.

Modeling and Simulation Use for Terminal Sizing and Decision Support

2006 ◽  
Author(s):  
Cesar Lellis Ferreira Leite ◽  
Guilherme de Aquino Barbosa ◽  
Ma´rio Jorge Lima
Keyword(s):  
Decision Support ◽  
Modeling And Simulation ◽  
Analytical Methods ◽  
Probabilistic Models ◽  
Service Level ◽  
Managerial Decisions ◽  
Tank Farm ◽  
Simulation Techniques ◽  
Analysis Methodology ◽  
And Storage

Modeling and simulation techniques were used for sizing and management of tank farm facilities. Probabilistic models representing interfaces (market, supply, production, laboratory, etc.) were represented in the model. The technique allows simulation of the logistic costs and service level in different scenarios, subsidizing technical and managerial decisions leading to optimization of inventories. Major advantages are: 1 – once it is created, a model can be used several times to assess the proposed projects and policies; 2 – the analysis methodology used by simulation enables the assessment of a proposed system, even if the entry data are still under form of schemes or drafts; 3 – simulation is generally easier to be applied than analytical methods; A partnership was created among several of Petrobras’ managers for the development of the so-called “Integral and Integrated Model of Transfer and Storage”. Examples of application of such model to some terminals and the relevant results obtained will be shown.

Promotion of the performance of nitrogen-doped graphene by secondary heteroatoms doping in energy transformation and storage

Ionics ◽  
2019 ◽  
Vol 25 (8) ◽  
pp. 3499-3522
Author(s):  
Yue Wang ◽  
Liang Yu ◽  
Weijun Zhu ◽  
Xiaohan Zhou ◽  
Ying Chen ◽  
...  
Keyword(s):  
Energy Transformation ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
And Storage

Nanoconfinement of phase change materials within carbon aerogels: phase transition behaviours and photo-to-thermal energy storage

2014 ◽  
Vol 2 (47) ◽  
pp. 19963-19968 ◽  
Author(s):  
Xinyu Huang ◽  
Wei Xia ◽  
Ruqiang Zou
Keyword(s):  
Phase Transition ◽  
Energy Storage ◽  
Phase Change ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
Phase Change Materials ◽  
Carbon Aerogels ◽  
Energy Transformation ◽  
And Storage

Nanoconfinement of octadecanol within carbon aerogels leads to a novel phase change composite with various phase transition behaviours for photo-to-thermal energy transformation and storage.

An Association Study of Energy Transformation in Banana Loaded by Force and its Damage Evolution

2012 ◽  
Vol 195-196 ◽  
pp. 1265-1270
Author(s):  
Feng Ying Xu ◽  
Zhen Chen ◽  
Peng Cheng Wang ◽  
Xiang Jun Zou ◽  
Ce Xu ◽  
...  
Keyword(s):  
Mechanical Energy ◽  
Quality Characteristics ◽  
Energy Transformation ◽  
Damage Area ◽  
Important Means ◽  
The Difference ◽  
Processing And Storage ◽  
The Individual ◽  
And Storage ◽  
Physiological And Biochemical

The research on the damage banana quality with loaded mechanical energy has significance to its storage, but there are few researches at present. This paper investigated 3 indexes of the energy and substance transformation in the damage banana by loading, including the change of the respiration rate CO2, the maximum impact stress intensity of fruit re-enduring and the maximum mechanical energy etc. during the storage. The results showed that there existed a significant association between the energy conversion and quality characteristics for the damaged banana, and the energy transformation affected the individuals physiological and biochemical process. There presented a significant trend on the intensity of the loading mechanical energy against the quality characteristics on above 3 indexes during the storage, but the difference between the individual had little effects on it. Decreasing the energy and substance transformation in damage area are the important means of extending the physiology life of fruits, which is an urgent problem to be solved in their field of processing and storage at present.

scholarly journals Exergetic and Economic Evaluation of CO2 Liquefaction Processes

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7174
Author(s):  
Feng Chen ◽  
Tatiana Morosuk
Keyword(s):  
Carbon Capture ◽  
Carbon Capture And Storage ◽  
Working Fluid ◽  
Vapor Compression ◽  
Compression Process ◽  
Total Capital ◽  
Closed Systems ◽  
Economic Analyses ◽  
Liquefaction Temperature ◽  
And Storage

The transport of CO2, as a part of the carbon capture and storage chain, has received increased attention in the last decade. This paper aims to evaluate the most promising CO2 liquefaction processes that can be used for port-to-port and port–offshore CO2 ship transportation. The energetic, exergetic, and economic analyses are applied. The liquefaction pressure has been set to 15 bar (liquefaction temperature −30 °C), which corresponds to the design of the existing CO2 carriers. The three-stage vapor-compression process has been selected among closed systems (with propane-R290, ammonia-R717, and R134a as the working fluid) and the precooled Linde–Hampson process—as the open system (with R717). The three-stage vapor-compression process R290 shows the lowest energy consumption, and the CO2 liquefaction cost 21.3 USD/tCO2. Although the power consumption of precooled Linde–Hampson process is 3.1% higher than the vapor-compression process with R209, the lowest total capital expenditures are notable. The CO2 liquefaction cost of precooled Linde–Hampson process is 21.13 USD/tCO2. The exergetic efficiency of the three-stage vapor-compression process with R290 is 66.6%, while the precooled Linde–Hampson process is 64.8%.

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