Tatiana Morosuk | Technical University Berlin (original) (raw)

Papers by Tatiana Morosuk

Energy Conversion and Management

Gas Science and Engineering

Volume 8A: Energy, 2021

Utilization of hydrogen (H2)/natural gas (NG) mixtures or pure hydrogen in gas-fired power plants... more Utilization of hydrogen (H2)/natural gas (NG) mixtures or pure hydrogen in gas-fired power plants poses a lower carbon footprint instead of the regular 100% NG fuel. Reducing carbon emissions (CO2) in electricity production is fast gaining huge traction in gas power plants, as the attention is shifting from soon eradicated coal power plants to low carbon power plants. Increased interest in the hydrogen economy has further aroused discussions for hydrogen to replace natural gas. This paper evaluates the impact of hydrogen mixtures on existing power plants in three countries: Denmark, Germany, and the United Kingdom. The investigation is carried out using energy, exergy, and economic analysis to depict implications of the various mixtures on each of the power plants. The simulation of the power plants was performed using Ebsilon software, while the calculations of CO2, and NOx emissions were carried out with the aid of the Cantera software and the exergy-based analysis was computed in...

Journal of Energy Resources Technology, 2021

The technology management methods and the “technology foresight” allow organizations and stakehol... more The technology management methods and the “technology foresight” allow organizations and stakeholders in a particular market/sector to create an advantage out of technological breakthroughs, sustain and expand technological competitiveness, and identify and evaluate new technological options. Several concepts are used depending mainly on the actual status of an evaluated technology. To identify the status of the supercritical carbon dioxide (sCO2) power generation technologies, an extensive “technology exploration” task was performed by creating a technology profile through collecting a database. This allowed for creating technological forecasts “scenario approach” for the sCO2 power cycles. In this article, the sCO2 power technology is explored, evaluated in relation to current commercial competitive power generation technologies, and forecasted to give an insight into future trends of the novel sCO2 power cycle in the future market. The outcome is the analysis of qualitative and q...

Energies

The present study investigates low-grade heat utilization in ejector refrigeration systems under ... more The present study investigates low-grade heat utilization in ejector refrigeration systems under hot climatic conditions. A variable area ejector is used to maximize the harvested heat from the generator of the solar system at peak times. Exergy, economic, and exergoeconomic analyses are conducted to evaluate the performance of the system. A thermodynamic model of the system has been developed using Ebsilon Professional software. Available experimental and theoretical data validate the results. The effects of properties of the working fluids, ejector geometry, and operation conditions are also evaluated. It was found that the coefficient of performance of the system reached 0.45 at a generator pressure of 3 bars. Furthermore, it was noticed that the overall exergy efficiency could be increased for a fixed generator temperature while increasing the ejector area ratio. A value of 21% exergetic efficiency was calculated for the system. The exergoeconomic analysis of the system demonstr...

IntechOpen eBooks, Jun 10, 2020

She studied refrigeration engineering in the Odessa State Academy of Refrigeration, Ukraine, and ... more She studied refrigeration engineering in the Odessa State Academy of Refrigeration, Ukraine, and received her diploma in 1990. She received her Ph.D. in 1994 and Professorship in 2001, all in the Ukraine. Professor Morosuk has over twenty years teaching experience in the fields of refrigeration, energy engineering, and applied thermodynamics. She is associated with several scientific organizations as well as many international energy-related conferences and recognized international journals. She serves as an associate editor for the following international journals: "Internation

Energies, 2021

Post-harvest loss is a serious issue to address challenge of food security. A solar-grid hybrid c... more Post-harvest loss is a serious issue to address challenge of food security. A solar-grid hybrid cold storage system was developed and designed for on-farm preservation of perishables. Computational Fluid Dynamic analysis was performed to assess airflow and temperature distribution inside the cold chamber. The system comprises a 21.84 m3 cubical cold storage unit with storage capacity of 2 tonnes. A hybrid solar system comprising 4.5 kWp PV system, 5 kW hybrid inverter, and 600 Ah battery bank was used to power the entire system. A vapor-compression refrigeration system (2 tonnes) was employed coupled with three cooling pads (filled with brine solution) as thermal backup to store cooling (−4 °C to 4 °C). Potatoes were stored at 8 °C for a period of three months (May 2019 to July 2019) and the system was tested on grid utility, solar, and hybrid modes. Solar irradiation was recorded in range of 5.0–6.0 kWh/(m2 × d) and average power peak was found to be 4.0 kW. Variable frequency driv...

This paper addresses the optimization of refrigeration systems by proposing a deterministic model... more This paper addresses the optimization of refrigeration systems by proposing a deterministic model involving both discrete and continuous decisions. The superstructure-based representation of vapor compression-absorption cascade refrigeration system, recently presented by the authors, is properly extended to include more candidate configurations as well as a cost model considering capital and operation expenditures. The proposed superstructure representation is then formulated as a mixed-integer nonlinear programming (MINLP) model and solved using an optimization algorithm based on the generalized reduced gradient method. The mass flowrate, pressure, temperature, composition of all streams, and the energy transferred with the associated heat transfer area and driving force of all process units are simultaneously optimized. The optimal configuration is selected from the proposed superstructure. The resulting optimization model is inherently combinatorial in nature and involves more than 20 candidate combinations. A study case is presented in order to show the utility of the proposed model. Given the desired design specifications — refrigeration temperature and capacity — the model allows obtaining the optimal configuration, process-unit sizes, and operating conditions that minimize the total annual cost. As a result of the model, the optimal configuration consisting of a stand-alone compression cycle with R717 is selected from the proposed superstructure to achieve 100 kW at −20 °C. Then, this optimal solution is compared with a solution obtained with a fixed configuration consisting of a vapor compression-absorption cascade refrigeration system which is a sub-optimal solution compared to the stand-alone compression cycle.

Energy Sources, Part A: Recovery, Utilization, And Environmental Effects, May 31, 2019

To reach the short-term targets of the carbon dioxide limit, measures such as carbon capture and ... more To reach the short-term targets of the carbon dioxide limit, measures such as carbon capture and storage are necessary. The objective of this paper is to assess some low-temperature post-combustion technologies for the capture of CO 2 from combustion gases. Two methods for the liquefaction and separation of CO 2 are discussed: The use of the low-temperature exergy of liquefied natural gas (LNG), while regasifying the LNG, and a refrigeration cycle with helium as the working fluid. Each of these methods is evaluated at three CO 2 concentrations: 30%, 13%, and 4%. The results showed that an increase in the concentration of CO 2 in the combustion gases causes a large increase in the overall exergetic efficiency and a large decrease in the cost of CO 2 capture and energy penalty of the capture process. In addition, these advantages can be seen when the liquefaction method is changed from helium refrigeration cycle to LNG regasification. For a 30% CO 2 concentration using LNG, the overall exergetic efficiency is 41.2%, and the cost of CO 2 capture is 45.5 $/tCO 2 with a CO 2 capture rate of 96.3%.

Environmental progress & sustainable energy, Sep 10, 2013

CO 2 capture and storage (CCS) is a way to minimize harmful emissions generated from the combusti... more CO 2 capture and storage (CCS) is a way to minimize harmful emissions generated from the combustion of fossil fuels in power plants. Measures to increase the thermodynamic efficiency of power plants incorporating CCS can improve their economic viability, as well as reduce the environmental impact of such applications. Exergy-based analyses are tools that aid the evaluation of energy conversion systems and reveal paths to improve them. In this article, an advanced exergetic analysis is applied to a near-zeroemission power plant that incorporates chemical looping combustion. The final goal is to reveal ways toward a more efficient and less polluting operation of the power plant. The objectives of the article further include the quantification of the different parts of the exergy destruction and the demonstration of the advantages of using such an advanced method. It has been found that most of the exergy destruction of the plant is endogenous and, for the majority of the components, unavoidable. When calculating the total avoidable exergy destruction caused by each component, it is found that the most important plant component is the reactor unit, followed by the expander and the compressor of the gas turbine. Lastly, the potential for improvement is found to lie mainly with the internal operation of the components, while the interactions among the plant components are less significant. V

Journal of Energy Resources Technology-transactions of The Asme, Mar 4, 2014

T a tia n a M o ro s u k

Environmental Science & Technology, Feb 22, 2012

Carbon capture and storage (CCS) from power plants can be used to mitigate CO 2 emissions from th... more Carbon capture and storage (CCS) from power plants can be used to mitigate CO 2 emissions from the combustion of fossil fuels. However, CCS technologies are energy intensive, decreasing the operating efficiency of a plant and increasing its costs. Recently developed advanced exergy-based analyses can uncover the potential for improvement of complex energy conversion systems, as well as qualify and quantify plant component interactions. In this paper, an advanced exergoenvironmental analysis is used for the first time as means to evaluate an oxy-fuel power plant with CO 2 capture. The environmental impacts of each component are split into avoidable/unavoidable and endogenous/exogenous parts. In an effort to minimize the environmental impact of the plant operation, we focus on the avoidable part of the impact (which is also split into endogenous and exogenous parts) and we seek ways to decrease it. The results of the advanced exergoenvironmental analysis show that the majority of the environmental impact related to the exergy destruction of individual components is unavoidable and endogenous. Thus, the improvement potential is rather limited, and the interactions of the components are of lower importance. The environmental impact of construction of the components is found to be significantly lower than that associated with their operation; therefore, our suggestions for improvement focus on measures concerning the reduction of exergy destruction and pollutant formation.

Energy, 2019

Splitting the physical exergy of a material stream into its thermal and mechanical parts represen... more Splitting the physical exergy of a material stream into its thermal and mechanical parts represented a new direction in the development of exergy analysis discussed in publications of

Journal of Cleaner Production, Apr 1, 2016

Abstract An exergoenvironmental analysis is conducted at the component level of a system and iden... more Abstract An exergoenvironmental analysis is conducted at the component level of a system and identifies (a) the relative contribution of each component to the environmental impact associated with the entire system, and (b) options for reducing the environmental impact associated with the overall system. In an exergoenvironmental analysis a one-dimensional characterization indicator is obtained using a Life Cycle Assessment (LCA). An index (a single number) describes the overall environmental impact associated with system components and exergy carriers. It should be mentioned that the evaluation of environmental impacts would always be subjective to some degree. The paper discusses the effect of the indicator used in an exergoenvironmental analysis on the conclusions obtained from the analysis using a compression refrigeration machine as an example. The results demonstrate that the contribution of the component-related environmental impact can be neglected in the exergoenvironmental evaluation, and that only the environmental impact associated with the exergy destruction should be considered in the analysis. For the case study reported here, the conclusions extracted from the exergoenvironmental evaluation are independent of the employed environmental indicator.

Chemical engineering research & design, Sep 1, 2011

CO 2 capture from power plants, combined with CO 2 storage, is a potential means for limiting the... more CO 2 capture from power plants, combined with CO 2 storage, is a potential means for limiting the impact of fossil fuel use on the climate. In this paper, three oxy-fuel plants with incorporated CO 2 capture are evaluated from an economic and environmental perspective. The oxy-fuel plants, a plant with chemical looping combustion with near 100% CO 2 capture and two advanced zero emission plants with 100% and 85% CO 2 capture are evaluated and compared to a similarly structured reference plant without CO 2 capture. To complete the comparison, the reference plant is also considered with CO 2 capture incorporating chemical absorption with monoethanolamine. Two exergy-based methods, the exergoeconomic and the exergoenvironmental analyses, are used to determine the cost-related and the environmental impacts of the plants, respectively, and to reveal options for improving their overall effectiveness. For the considered oxy-fuel plants, the investment cost is estimated to be almost double that of the reference plant, mainly due to the equipment used for oxygen production and CO 2 compression. Furthermore, the exergoeconomic analysis reveals an increase in the cost of electricity with respect to the reference plant by more than 20%, with the advanced zero emission plant with 85% CO 2 capture being the most economical choice. On the other hand, a life cycle assessment reveals a decrease in the environmental impact of the plants with CO 2 capture, due to the CO 2 and NO x emission control. This leads to a reduction in the overall environmental impact of the plants by more than 20% with respect to the reference plant. The most environmentally friendly concept is the plant with chemical looping combustion.

Energy, Feb 1, 2019

Exergy-based methods are powerful tools for developing, evaluating, understanding, and improving ... more Exergy-based methods are powerful tools for developing, evaluating, understanding, and improving energy conversion systems. This paper deals with integrated advanced exergybased evaluations. In addition to conventional methods, advanced exergy-based analyses consider (a) the interactions among components of the overall system, and (b) the real potential for improving each important system component. The main role of an advanced analysis is to provide energy conversion system designers and operators with information useful for improving the design and operation of such systems. Splitting the exergy destruction, the capital investment cost, and the component-related environmental impact associated with each single component of an energy conversion system into endogenous/exogenous and avoidable/unavoidable parts and using a further splitting of the exogenous exergy destruction improves (a) our understanding of the processes that take place,

Energies, Jun 15, 2012

A conventional exergy analysis can highlight the main components having high thermodynamic ineffi... more A conventional exergy analysis can highlight the main components having high thermodynamic inefficiencies, but cannot consider the interactions among components or the true potential for the improvement of each component. By splitting the exergy destruction into endogenous/exogenous and avoidable/unavoidable parts, the advanced exergy analysis is capable of providing additional information to conventional exergy analysis for improving the design and operation of energy conversion systems. This paper presents the application of both a conventional and an advanced exergy analysis to a supercritical coal-fired power plant. The results show that the ratio of exogenous exergy destruction differs quite a lot from component to component. In general, almost 90% of the total exergy destruction within turbines comes from their endogenous parts, while that of feedwater preheaters contributes more or less 70% to their total exergy destruction. Moreover, the boiler subsystem is proven to have a large amount of exergy destruction caused by the irreversibilities within the remaining components of the overall system. It is also found that the boiler subsystem still has the largest avoidable exergy destruction; however, the enhancement efforts should focus not only on its inherent irreversibilities but also on the inefficiencies within the remaining components. A large part of the avoidable exergy destruction within feedwater preheaters is exogenous; while that of the remaining components is mostly endogenous indicating that the improvements mainly depend on advances in design and operation of the component itself.

international journal of energy and environmental engineering, 2012

The main objective of this work is to design a prototype of a low-cost solar-grid utility hybrid ... more The main objective of this work is to design a prototype of a low-cost solar-grid utility hybrid load sharing system to support the agricultural DC equipment that has already been used in the rural area of Thailand. Time-division multiplexing (TDM) technique is employed in the prototype construction, and it is used to evaluate the time interval for two power MOSFETs to switch between two applicable power supplies: in this case, solar panels and grid utility. The time interval is generated by the internal timer from a microcontroller and is divided into two square waves which are 180° out of phase (opposite sides). Each time interval is derived by the fuzzy logic controller and is calculated based on the consumption of electrical load. The experimental results are divided into three parts; first result shows a smooth output level that is consisted of the signal between solar panels and grid utility for each particular ratio. The second result shows a high efficiency of this system upon the variation of load power. Finally, we demonstrate a relatively good sharing of the electrical power when this system is operated under various capacities of the power sources. Our prototype offers the feasibility of hybridization of renewable energy and grid utility in which the technology is easily accessible by agriculturists throughout the world.

Energy, Jun 1, 2011

During the last two decades the total cost of LNG technology has decreased significantly due to i... more During the last two decades the total cost of LNG technology has decreased significantly due to improvements of the liquefaction process. However, the regasification system has not been considerably improved. It is known that for the regasification process about 1.5% of LNG is used. Two novel, gasturbine-based concepts for combining LNG regasification with the generation of electricity are discussed in this paper. These concepts have relatively low investment costs and high efficiencies. An advanced exergetic analysis is applied to one of these attractive LNG-based cogeneration systems to identify the potential for improvement and the interactions among components. In an advanced exergetic analysis, the exergy destruction within each component is split into unavoidable/avoidable and endogenous/ exogenous parts. The advantages of this analysis over a conventional one are demonstrated. Some new developments in the advanced exergetic analysis and options for improving the concepts are also presented.

Journal of Cleaner Production, 2012

ABSTRACT This paper investigates the environmental aspects of a steam methane reformer technology... more ABSTRACT This paper investigates the environmental aspects of a steam methane reformer technology and highlights the potential for improving the reformer through a conventional and an advanced exergoenvironmental analysis. An exergoenvironmental analysis is a complex analysis based on a combination of an exergetic analysis and a Life Cycle Assessment (LCA). This analysis is conducted at the component level and identifies options for reducing the overall environmental impact. To evaluate the thermodynamic performance and environmental effectiveness of the reformer and to estimate its realistic potential for improvement, it is necessary to know (a) the avoidable part of the exergy destruction (irreversibilities) within the component, and (b) the avoidable environmental impact associated with it. Improvement efforts should be then focused only on these avoidable parts. The avoidable environmental impacts associated with both exergy destruction and component-related environmental impact are calculated in the advanced exergoenvironmental analysis. As a result, some suggestions for improving the design of the reformer are made.