Analysis of internal and external energy flows associated with projected process improvements in biomass ethanol production

1995 ◽  
Vol 51-52 (1) ◽  
pp. 569-584 ◽  
Author(s):  
Kevin Stone ◽  
Lee R. Lynd
Keyword(s):  
Ethanol Production ◽  
External Energy ◽  
Process Improvements ◽  
Energy Flows ◽  
Projected Process

Thermocatalytic CO 2 hydrogenation for methanol and ethanol production: Process improvements

2016 ◽  
Vol 41 (2) ◽  
pp. 792-806 ◽  
Author(s):  
Konstantinos Atsonios ◽  
Kyriakos D. Panopoulos ◽  
Emmanuel Kakaras
Keyword(s):  
Production Process ◽  
Ethanol Production ◽  
Process Improvements

scholarly journals Directional, passive liquid transport: the Texas horned lizard as a model for a biomimetic ‘liquid diode’

2015 ◽  
Vol 12 (109) ◽  
pp. 20150415 ◽  
Author(s):  
Philipp Comanns ◽  
Gerda Buchberger ◽  
Andreas Buchsbaum ◽  
Richard Baumgartner ◽  
Alexander Kogler ◽  
...  
Keyword(s):  
Fluid Transport ◽  
Periodic Pattern ◽  
External Energy ◽  
Liquid Transport ◽  
Process Improvements ◽  
Phrynosoma Cornutum ◽  
Moist Sand ◽  
Texas Horned Lizard ◽  
Biomimetic Approach ◽  
Prototype Design

Moisture-harvesting lizards such as the Texas horned lizard (Iguanidae: Phrynosoma cornutum ) live in arid regions. Special skin adaptations enable them to access water sources such as moist sand and dew: their skin is capable of collecting and transporting water directionally by means of a capillary system between the scales. This fluid transport is passive, i.e. requires no external energy, and directs water preferentially towards the lizard's snout. We show that this phenomenon is based on geometric principles, namely on a periodic pattern of interconnected half-open capillary channels that narrow and widen. Following a biomimetic approach, we used these principles to develop a technical prototype design. Building upon the Young–Laplace equation, we derived a theoretical model for the local behaviour of the liquid in such capillaries. We present a global model for the penetration velocity validated by experimental data. Artificial surfaces designed in accordance with this model prevent liquid flow in one direction while sustaining it in the other. Such passive directional liquid transport could lead to process improvements and reduction of resources in many technical applications.

scholarly journals An online tool for calculation of free-energy balance for the renal inner medulla

2012 ◽  
Vol 303 (3) ◽  
pp. F366-F372 ◽  
Author(s):  
Ryan L. Vilbig ◽  
Abhijit Sarkar ◽  
Joseph Zischkau ◽  
Mark A. Knepper ◽  
Trairak Pisitkun
Keyword(s):  
Free Energy ◽  
Steady State ◽  
Energy Balance ◽  
Computational Tool ◽  
Flow Conditions ◽  
External Energy ◽  
Online Tool ◽  
Energy Flows ◽  
External Energy Source ◽  
Renal Inner Medulla

Concentrating models of the renal inner medulla can be classified according to external free-energy balance into passive models (positive values) and models that require an external energy source (negative values). Here we introduce an online computational tool that implements the equations of Stephenson and colleagues (Stephenson JL, Tewarson RP, Mejia R. Proc Natl Acad Sci USA 71: 1618–1622, 1974) to calculate external free-energy balance at steady state for the inner medulla ( http://helixweb.nih.gov/ESBL/FreeEnergy ). Here “external free-energy balance” means the sum of free-energy flows in all streams entering and leaving the inner medulla. The program first assures steady-state mass balance for all components and then tallies net external free-energy balance for the selected flow conditions. Its use is illustrated by calculating external free-energy balance for an example of the passive concentrating model taken from the original paper by Kokko and Rector (Kokko JP, Rector FC Jr. Kidney Int 2: 214–223, 1972).

scholarly journals The Efficiency of Vapor Compression Transformation of Energy Flows for Heat Supply Based on the Sea Water

2021 ◽  
Vol 64 (6) ◽  
pp. 538-558
Author(s):  
V. D. Petrash ◽  
V. O. Makarov ◽  
A. A. Khomenko
Keyword(s):  
Heat Pump ◽  
Heat Supply ◽  
Sea Water ◽  
Heat Supply System ◽  
Water Area ◽  
Supply System ◽  
The Black Sea ◽  
Outdoor Temperature ◽  
External Energy ◽  
Energy Flows

The results of the analytical study substantiated the operating conditions for the highly efficient use of the temperature potential of seawater in heat pump heating systems (HPHS) for buildings a building with correspondingly improved environmental indicators. Based on the analysis of the regional conditions of the Odessa water area of the Black Sea, the initial parameters have been substantiated and rational modes of operation of an improved HPHS with central, decentralized or local heating of the subscriber energy carrier have been determined. As indicators for evaluating the efficiency of the HPHS operation, the conversion factor of energy flows and the specific consumption of external energy for the drive of the compressor and the circulating pump of cooled water in the operation of heat pump units were considered. For seawater in the Odessa water area of the Black Sea during the entire heating period, the following temperatures were considered as initial data for analysis: water at the inlet to the evaporator (5–10) ° C, at the outlet (1 °C); calculated temperature difference of the coolant in the heating system (50–40) °C, indoor air (20 °C); estimated outdoor temperature (–18 °C). The characteristic correspondence between the flow rates of the cooled sea water and the heated energy carrier of the heat supply system was taken into account. The prerequisites of high efficiency of the heat pump heat supply system in which the actual conversion coefficient exceeds the seasonal normalized calculated and minimum value at an outdoor temperature of (–10) °C under the limiting conditions of the monoenergy regime for both new and reconstructed buildings were substantiated. In the course of the study, it has been determined that the total specific consumption of external energy for the compressor drive and the circulation of cooled water in the operation of a heat pump unit with a characteristic ratio of water equivalents, even under the limiting conditions of the monoenergetic mode of operation of the heat supply system at an outdoor temperature of (–10) °C, are within the range of generally accepted values (w = 0.28–0.34).

DECOLOURIZATION AND COD REMOVAL OF WASEWATER FROM ETHANOL PRODUCTION PROCESS FROM MOLASSES BY COAGULANTION USING INORGANIC ALUM

2010 ◽  
Vol 13 (3) ◽  
pp. 92-102
Author(s):  
Trung Duc Le
Keyword(s):  
Ethanol Production ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Treated Wastewater ◽  
Treatment Processes ◽  
Physico Chemical ◽  
Biological Methods ◽  
Treatment Step ◽  
Main Material

The industrial production of ethanol by fermentation using molasses as main material that generates large quantity of wastewater. This wastewater contains high levels of colour and chemical oxygen demand (COD), that may causes serious environmental pollution. Most available treatment processes in Vietnam rely on biological methods, which often fail to treat waste water up to discharge standard. As always, it was reported that quality of treated wastewater could not meet Vietnameses discharge standard. So, it is necessary to improve the treatment efficiency of whole technological process and therefore, supplemental physico-chemical treatment step before biodegradation stage should be the appropriate choice. This study was carried out to assess the effect of coagulation process on decolourization and COD removal in molasses-based ethanol production wastewater using inorganic coaglutant under laboratory conditions. The experimental results showed that the reductions of COD and colour with the utilization of Al2(SO4)3 at pH 9.5 were 83% and 70%, respectively. Mixture FeSO4 – Al2(SO4)3 at pH 8.5 reduced 82% of colour and 70% of COD. With the addition of Polyacrylamide (PAM), the reduction efficiencies of colour, COD and turbidity by FeSO4 – Al2(SO4)3 were 87%, 73.1% and 94.1% correspondingly. It was indicated that PAM significantly reduced the turbidity of wastewater, however it virtually did not increase the efficiencies of colour and COD reduction. Furthermore, the coagulation processes using PAM usually produces a mount of sludge which is hard to be deposited.

Energy Management of Electromechanical Systems on the Board of a Ship

2020 ◽  
Vol 26 (3) ◽  
pp. 14-19
Author(s):  
Laurențiu Bogdan Asalomia ◽  
Gheorghe Samoilescu
Keyword(s):  
Energy Management ◽  
Management System ◽  
Integrated Management ◽  
Integrated Management System ◽  
Management Actions ◽  
Energy Flows ◽  
Reduce Emissions ◽  
Technical Solutions ◽  
Productive Time

AbstractThe paper analyzes, starting from the Integrated Management System, the role of automation, the role of the officer and the role of the Energy Management System on board the ship. The implementation of an EnMS establishes the structure and discipline of identifying energy flows, implementing management actions and, finally, applying technical solutions, which significantly reduce energy costs, reduce non-productive time in production, and reduce emissions. of Greenhouse Gases in the environment. The steps to be highlighted in the realization of energy management are analyzed.

Russian-Japanese Relations: Long-Term Development Factors

2020 ◽  
Vol 13 (3) ◽  
pp. 68-85
Author(s):  
D. V. Streltsov
Keyword(s):  
Security Policy ◽  
The United States ◽  
Peace Treaty ◽  
Strategic Decisions ◽  
Chinese Market ◽  
External Energy ◽  
Economic Relations ◽  
Bilateral Relations ◽  
Personal Diplomacy

The article analyzes long-term external and internal factors determining the course of development of Russian-Japanese relations in 2019-2020. On the one hand, the anti-Russian component in Tokyo's foreign policy is shaped by its membership in the Security Treaty with the United States and its solidarity with the sanctions policy of the Group of Seven towards Russia. On the other hand, Japan and Russia are both interested interest in political cooperation in creating multilateral dialog mechanisms of international security in East Asia, resolving the nuclear issue on the Korean Peninsula, and easing tensions around territorial disputes in the East China and South China seas. Among the economic factors, the author focuses on the significant place of Russia in the context of Japan's task of diversifying sources of external energy supplies, as well as on Russia's desire to avoid unilateral dependence on the Chinese market while reorienting the system of foreign economic relations from the West to the East. Personal diplomacy of political leaders plays a significant role in relations between Russia and Japan, and, above all, close personal relationships and frequent meetings between Prime Minister Abe and President Putin, which make it possible to partially compensate the unfavorable image of the partner country in the public opinion of both Russia and Japan. Against the background of a deadlock in the Peace Treaty talks which emerged in 2019, the search for a way out of the diplomatic impasse is on the agenda. In the author's opinion, it would be appropriate at the first stage to proceed to the conclusion of a basic agreement on the basis bilateral relations, which would be "untied" from the Peace Treaty. In addition, Russia could stop criticizing Japan for its security policy and show greater understanding of the Japanese initiative in the field of quality infrastructure. In turn, Japan could take a number of strategic decisions on cooperation with Russia and announce them in the Prime Minister's keynote speech. In addition, Tokyo could stop positioning the issue of the peace Treaty as the main issue in relations with Russia, which would allow our countries to "untie" bilateral relations from the problem of border demarcation and focus on their positive agenda.

Sign in / Sign up

Export Citation Format

Share Document