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Journal articles on the topic 'Energy and exergy analyses'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Okunola, Abiodun, Timothy Adekanye, and Endurance Idahosa. "Energy and exergy analyses of okra drying process in a forced convection cabinet dryer." Research in Agricultural Engineering 67, No. 1 (March 31, 2021): 8–16. http://dx.doi.org/10.17221/48/2020-rae.

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A forced convection automatic cabinet dryer integrated with a data logger was designed and fabricated. The okra samples were dried in the dryer at drying temperatures of 50, 60, and 70 °C and at three different load densities of 200, 300, and 400 g at a continuous air velocity of 0.7 m·s<sup>–1</sup>. Energy and exergy analyses of the drying process were performed. The obtained results showed that the energy efficiency, energy utilisation, and utilisation ratio increased from 26.59 to 68.24%, 5.47 to 114.36 W, and 0.36 to 0.71 as the temperature increased to 70 °C, respectively. The inflow, outflow, and exergy losses were in the range of 7.02 to 26.14 W, 4.43 to 14.16 W, and 2.59 to 11.98 W, respectively, while exergy efficiency varied from 49.15 to 63.47%. The findings show that exergy efficiencies decrease with an increase in the drying temperature, but increase with a lower load rate. The index of sustainability varies from 2.14 to 2.77, the value increases as the load density decreases while it decreases with a temperature increment.

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2

Ziębik, Andrzej, and Paweł Gładysz. "Systems approach to energy and exergy analyses." Energy 165 (December 2018): 396–407. http://dx.doi.org/10.1016/j.energy.2018.08.214.

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3

Saloux, E., M. Sorin, and A. Teyssedou. "Exergo-economic analyses of two building integrated energy systems using an exergy diagram." Solar Energy 189 (September 2019): 333–43. http://dx.doi.org/10.1016/j.solener.2019.07.070.

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4

Tiwari, G. N., Tribeni Das, C. R. Chen, and P. Barnwal. "Energy and exergy analyses of greenhouse fish drying." International Journal of Exergy 6, no. 5 (2009): 620. http://dx.doi.org/10.1504/ijex.2009.027493.

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5

Bayrak, Mustafa, Adnan Midilli, and Kemal Nurveren. "Energy and exergy analyses of sugar production stages." International Journal of Energy Research 27, no. 11 (2003): 989–1001. http://dx.doi.org/10.1002/er.916.

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6

Sayin, C., M. Hosoz, M. Canakci, and I. Kilicaslan. "Energy and exergy analyses of a gasoline engine." International Journal of Energy Research 31, no. 3 (2007): 259–73. http://dx.doi.org/10.1002/er.1246.

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7

Cheng, Ching-Shang, and Yen-Shiang Shih. "Exergy and energy analyses of absorption heat pumps." International Journal of Energy Research 12, no. 2 (March 1988): 189–203. http://dx.doi.org/10.1002/er.4440120202.

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8

Özdoĝan, Si̇bel, and Mahi̇r Arikol. "Energy and exergy analyses of selected Turkish industries." Energy 20, no. 1 (January 1995): 73–80. http://dx.doi.org/10.1016/0360-5442(94)00054-7.

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9

Rosen, M. "Energy and exergy analyses of electrolytic hydrogen production." International Journal of Hydrogen Energy 20, no. 7 (July 1995): 547–53. http://dx.doi.org/10.1016/0360-3199(94)00102-6.

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10

Ehyaei, M. A., A. Ahmadi, and Marc A. Rosen. "Energy, exergy, economic and advanced and extended exergy analyses of a wind turbine." Energy Conversion and Management 183 (March 2019): 369–81. http://dx.doi.org/10.1016/j.enconman.2019.01.008.

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11

Dixit, Manoj, S. C. Kaushik, and Akhilesh Arora. "Energy and Exergy Analysis of Solar Triple Effect Refrigeration Cycle." Journal of Clean Energy Technologies 5, no. 3 (May 2017): 222–27. http://dx.doi.org/10.18178/jocet.2017.5.3.373.

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12

Al-Ghandoor, A. "Evaluation of energy use in Jordan using energy and exergy analyses." Energy and Buildings 59 (April 2013): 1–10. http://dx.doi.org/10.1016/j.enbuild.2012.12.035.

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13

Vuckovic, Goran, Mica Vukic, Mirko Stojiljkovic, and Dragan Vuckovic. "Avoidable and unavoidable exergy destruction and exergoeconomic evaluation of the thermal processes in a real industrial plant." Thermal Science 16, suppl. 2 (2012): 433–46. http://dx.doi.org/10.2298/tsci120503181v.

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Exergy analysis is a universal method for evaluating the rational use of energy. It can be applied to any kind of energy conversion system or chemical process. An exergy analysis identifies the location, the magnitude and the causes of thermodynamic inefficiencies and enhances understanding of the energy conversion processes in complex systems. Conventional exergy analyses pinpoint components and processes with high irreversibility. To overcome the limitations of the conventional analyses and to increase our knowledge about a plant, advanced exergy-based analyses are developed. These analyses provide additional information about component interactions and reveal the real potential for improvement of each component constituting a system, as well as of the overall system. In this paper, a real industrial plant is analyzed using both conventional and advanced exergy analyses, and exergoeconomic evaluation. Some of the exergy destruction in the plant components is unavoidable and constrained by technological, physical and economic limitations. Calculations related to the total avoidable exergy destruction caused by each component of the plant supplement the outcome of the conventional exergy analysis. Based on the all-reaching analysis, by improving the boiler operation (elimination of approximately 1 MW of avoidable exergy destruction in the steam boiler) the greatest improvement in the efficiency of the overall system can be achieved.

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14

Chowdhury, Tamal, Hemal Chowdhury, Ashfaq Ahmed, Young-Kwon Park, Piyal Chowdhury, Nazia Hossain, and Sadiq M. Sait. "Energy, Exergy, and Sustainability Analyses of the Agricultural Sector in Bangladesh." Sustainability 12, no. 11 (May 30, 2020): 4447. http://dx.doi.org/10.3390/su12114447.

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Globally, the agriculture sector consumes a considerable portion of energy. Optimizing energy consumption and energy loss from different fuel-based types of machinery will increase the energy sustainability of this sector. Exergy analysis is a useful optimizing method that applies the thermodynamic approach to minimize energy loss. The main goal of this study is to highlight the impact of exergy loss on the energy sustainability of the agriculture sector. Hence, this study focuses on the implementation of exergy-based sustainability parameters to determine the sustainability of the agricultural sector in Bangladesh. A comprehensive analysis combining energy, exergy, and sustainability indicators was conducted based on the data obtained from 1990 to 2017. Overall energy and exergy efficiencies varied between 29.86% and 36.68% and 28.2% and 35.4%, respectively, whereas the sustainability index varied between 1.39 and 1.54. The values of relative irreversibility and lack of productivity indices from diesel fuel are higher than that of other fuel types. Maximum relative irreversibility is 0.95, whereas maximum lack of productivity is 2.50. The environmental effect factor of diesel fuel is the highest (2.47) among all the analyzed fuel types. Replacing old farming devices and selecting appropriate farming methods, appliances, and control systems will reduce exergy loss in this sector.

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15

Fiaschi, Daniele, Giampaolo Manfrida, Barbara Mendecka, Moein Shamoushaki, and Lorenzo Talluri. "Exergy and Exergo-Environmental analysis of an ORC for a geothermal application." E3S Web of Conferences 238 (2021): 01011. http://dx.doi.org/10.1051/e3sconf/202123801011.

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Emissions of contaminants and CO2 are becoming a relevant issue for the development of geothermal energy projects. Organic Rankine (ORC) Cycles present in this light particular appeal in the light of the possibility of total reinjection of the geothermal fluid resource including Non-Condensable Gases (NCGs). The Castelnuovo (IT) case study conditions are considered a saturated vapour resource at 10 bar pressure. The performance of the ORC cycle for power generation from this geothermal resource is evaluated through mass and energy balances, stepping up to exergy, Life Cycle Analysis (LCA) and Exergo-Environmental analyses (EEvA). The applied methodology allows to identify the most critical components of the system and to evaluate the environmental indicators of the system.

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16

Rafique, M. Mujahid, P. Gandhidasan, Luai M. Al-Hadhrami, and Shafiqur Rehman. "Energy, Exergy and Anergy Analysis of a Solar Desiccant Cooling System." Journal of Clean Energy Technologies 4, no. 1 (2015): 78–83. http://dx.doi.org/10.7763/jocet.2016.v4.257.

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17

Incer, Jimena, Sarah Hamdy, Tatiana Morosuk, and Georges Tsatsaronis. "Improvements perspectives of cryogenics-based energy storage." E3S Web of Conferences 137 (2019): 01019. http://dx.doi.org/10.1051/e3sconf/201913701019.

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Advanced exergy-based analyses provide the information for potential of improvement of energy- conversion systems from exergetic, economic and environmental point of view. These analyses are applied to Cryogenic-based Energy Storage (CES) also known as Liquid Air Energy Storage (LAES). Advantages such as (a) lack of geographical restrictions, (b) low environmental impact and the fact that it is (c) based on mature technology, drive further the research on this energy storage system. An adiabatic LAES system charged with Heylandt liquefaction of air process is analysed. Parameters such as exergy destruction, investment cost, cost associated with the exergy destruction, as well as the environmental impact associated with the thermodynamic irreversibilities are split into avoidable/unavoidable and endogenous/exogenous parts. Aspen Plus® software was used to simulate the LAES system and Engineering Equation Solver was used to conduct the conventional and advanced exergy-based analyses. The dependence of the improvement of each component with the rest of the system was found and all components present higher exogenous exergy destruction than endogenous. The component with the highest potential for improvement is the main heat exchanger in the discharge unit. Focusing on improvement of the components that were found to be the most inefficient ones with the highest exergy destruction, CES is expected to become thermodynamically and economically feasible.

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18

Prommas, Ratthasak, Sahachai Phiraphat, and Phadungsak Rattanadecho. "Energy and Exergy Analyses of PV Roof Solar Collector." International Journal of Heat and Technology 37, no. 1 (March 31, 2019): 303–12. http://dx.doi.org/10.18280/ijht.370136.

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19

Obaidat, Mazin, Ahmed Al-Ghandoor, Patrick Phelan, Rene Villalobos, and Ammar Alkhalidi. "Energy and Exergy Analyses of Different Aluminum Reduction Technologies." Sustainability 10, no. 4 (April 17, 2018): 1216. http://dx.doi.org/10.3390/su10041216.

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20

Celma, A. R., and F. Cuadros. "Energy and exergy analyses of OMW solar drying process." Renewable Energy 34, no. 3 (March 2009): 660–66. http://dx.doi.org/10.1016/j.renene.2008.05.019.

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21

Ameri, M., F. Kiaahmadi, M. Khanaki, and M. Nazoktabar. "Energy and exergy analyses of a spark-ignition engine." International Journal of Exergy 7, no. 5 (2010): 547. http://dx.doi.org/10.1504/ijex.2010.034928.

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22

Hajidavalloo, Ebrahim, and Amir Vosough. "Energy and exergy analyses of a supercritical power plant." International Journal of Exergy 9, no. 4 (2011): 435. http://dx.doi.org/10.1504/ijex.2011.044059.

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23

Idlimam, Ali, Abdelkader Lamharrar, Haytem Moussaoui, Tagnamas Zakaria, Bahammou Younes, Mounir Kouhila, Hind Mouhanni, and Hamza Lamsyehe. "Energy and exergy analyses of solar drying sardine fillets." International Journal of Exergy 33, no. 3 (2020): 304. http://dx.doi.org/10.1504/ijex.2020.10032779.

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24

Lamsyehe, Hamza, Bahammou Younes, Hind Mouhanni, Mounir Kouhila, Tagnamas Zakaria, Haytem Moussaoui, Abdelkader Lamharrar, and Ali Idlimam. "Energy and exergy analyses of solar drying sardine fillets." International Journal of Exergy 33, no. 3 (2020): 304. http://dx.doi.org/10.1504/ijex.2020.110871.

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25

Hutchins, T. E., and M. Metghalchi. "Energy and Exergy Analyses of the Pulse Detonation Engine." Journal of Engineering for Gas Turbines and Power 125, no. 4 (October 1, 2003): 1075–80. http://dx.doi.org/10.1115/1.1610015.

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Energy and exergy analyses have been performed on a pulse detonation engine. A pulse detonation engine is a promising new engine, which uses a detonation wave instead of a deflagration wave for the combustion process. The high-speed supersonic combustion wave reduces overall combustion duration resulting in an nearly constant volume energy release process compared to the constant pressure process of gas turbine engines. Gas mixture in a pulse detonation engine has been modeled to execute the Humphrey cycle. The cycle includes four processes: isentropic compression, constant volume combustion, isentropic expansion, and isobaric compression. Working fluid is a fuel-air mixture for unburned gases and products of combustion for burned gases. Different fuels such as methane and JP10 have been used. It is assumed that burned gases are in chemical equilibrium states. Both thermal efficiency and effectiveness (exergetic efficiency) have been calculated for the pulse detonation engine and simple gas turbine engine. Comparison shows that for the same pressure ratio pulse detonation engine has better efficiency and effectiveness than the gas turbine system.

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26

Atienza-Martínez, María, Javier Ábrego, José Francisco Mastral, Jesús Ceamanos, and Gloria Gea. "Energy and exergy analyses of sewage sludge thermochemical treatment." Energy 144 (February 2018): 723–35. http://dx.doi.org/10.1016/j.energy.2017.12.007.

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27

Yildiz, Abdullah, and Ali Güngör. "Energy and exergy analyses of space heating in buildings." Applied Energy 86, no. 10 (October 2009): 1939–48. http://dx.doi.org/10.1016/j.apenergy.2008.12.010.

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28

Bühler, Fabian, Tuong-Van Nguyen, and Brian Elmegaard. "Energy and exergy analyses of the Danish industry sector." Applied Energy 184 (December 2016): 1447–59. http://dx.doi.org/10.1016/j.apenergy.2016.02.072.

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29

Rosen, Marc A., Norman Pedinelli, and Ibrahim Dincer. "Energy and exergy analyses of cold thermal storage systems." International Journal of Energy Research 23, no. 12 (October 10, 1999): 1029–38. http://dx.doi.org/10.1002/(sici)1099-114x(19991010)23:12<1029::aid-er538>3.0.co;2-c.

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30

Abozaid Abobakr Abdelghanya, Tarek, Rafea, Mohamed Abd El-Maksoud, and Mohamed A. A. Nawar. "COMPRESSOR ENERGY AND EXERGY ANALYSIS." Engineering Research Journal 168 (December 1, 2020): 211–26. http://dx.doi.org/10.21608/erj.2020.145866.

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31

Lems, S., H. J. Van Der Kooi, and J. De Swaan Arons. "Exergy analyses of the biochemical processes of photosynthesis." International Journal of Exergy 7, no. 3 (2010): 333. http://dx.doi.org/10.1504/ijex.2010.031988.

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32

Montazerinejad, Hadis, Pouria Ahmadi, and Zeynab Montazerinejad. "Advanced exergy, exergo-economic and exrgo-environmental analyses of a solar based trigeneration energy system." Applied Thermal Engineering 152 (April 2019): 666–85. http://dx.doi.org/10.1016/j.applthermaleng.2019.01.040.

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33

Atalay, Halil, and Eda Cankurtaran. "Energy, exergy, exergoeconomic and exergo-environmental analyses of a large scale solar dryer with PCM energy storage medium." Energy 216 (February 2021): 119221. http://dx.doi.org/10.1016/j.energy.2020.119221.

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34

Alsarayreh, Ahmad A., Ayman Al-Maaitah, Menwer Attarakih, and Hans-Jörg Bart. "Energy and Exergy Analyses of Adsorption Chiller at Various Recooling-Water and Dead-State Temperatures." Energies 14, no. 8 (April 13, 2021): 2172. http://dx.doi.org/10.3390/en14082172.

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We conducted energy and exergy analyses of an adsorption chiller to investigate the effect of recooling-water temperatures on the cooling capacity and Coefficient of Performance (COP) with variable cycle modes. We investigated both the effect of the recooling-water temperature and the dead state temperature on the exergy destruction in the chiller components. Our results show that there is an optimum reheat cycle mode for each recooling-water temperature range. For the basic single stage cycle, the exergy destruction is mainly accrued in the desorber (49%), followed by the adsorber (27%), evaporator (13%), condenser (9%), and expansion valve (2%). The exergy destruction for the preheating process is approximately 35% of the total exergy destruction in the desorber. By contrast, the precooling process is almost 58% of the total exergy destruction in the adsorber. The exergy destruction decreases when increasing the recooling-water and the dead state temperatures, while the exergy efficiency increases. Nonetheless, the exergy efficiency decreases with an increase in the recooling-water temperature at fixed dead state temperatures. The effect of the mass recovery time in the reheat cycle on exergy destruction was also investigated, and the results show that the exergy destruction increases when the mass recovery time increases. The exergy destruction in the adsorbent beds was the most sensitive to the increase in mass recovery time.

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35

Kim, Young-Min, Jang-Hee Lee, Seok-Joon Kim, and Daniel Favrat. "Potential and Evolution of Compressed Air Energy Storage: Energy and Exergy Analyses." Entropy 14, no. 8 (August 10, 2012): 1501–21. http://dx.doi.org/10.3390/e14081501.

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36

Ezzat, M. F., and I. Dincer. "Energy and exergy analyses of a new geothermal–solar energy based system." Solar Energy 134 (September 2016): 95–106. http://dx.doi.org/10.1016/j.solener.2016.04.029.

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37

Acar, Canan, and Ibrahim Dincer. "Energy and exergy analyses of a residential cold thermal energy storage system." International Journal of Exergy 19, no. 4 (2016): 441. http://dx.doi.org/10.1504/ijex.2016.075879.

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38

Sharma, Manish, Rahul Vaish, and Vishal Singh Chauhan. "Energy and Exergy Analyses of a Pyroelectric-Based Solar Energy Harvesting System." Energy Technology 3, no. 12 (December 2015): 1271–78. http://dx.doi.org/10.1002/ente.201500230.

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39

ROSEN, M. "Evaluation of energy utilization efficiency in Canada using energy and exergy analyses." Energy 17, no. 4 (April 1992): 339–50. http://dx.doi.org/10.1016/0360-5442(92)90109-d.

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40

Fiaschi, Daniele, Giampaolo Manfrida, Karolina Petela, and Lorenzo Talluri. "Thermo-Electric Energy Storage with Solar Heat Integration: Exergy and Exergo-Economic Analysis." Energies 12, no. 4 (February 17, 2019): 648. http://dx.doi.org/10.3390/en12040648.

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A Thermo-Electric Energy Storage (TEES) system is proposed to provide peak-load support (1–2 daily hours of operation) for distributed users using small/medium-size photovoltaic systems (4 to 50 kWe). The purpose is to complement the PV with a reliable storage system that cancompensate the produc tivity/load mismatch, aiming at off-grid operation. The proposed TEES applies sensible heat storage, using insulated warm-water reservoirs at 120/160 °C, and cold storage at −10/−20 °C (water and ethylene glycol). The power cycle is a trans-critical CO2 unit including recuperation; in the storage mode, a supercritical heat pump restores heat to the hot reservoir, while a cooling cycle cools the cold reservoir; both the heat pump and cooling cycle operate on photovoltaic (PV) energy, and benefit from solar heat integration at low–medium temperatures (80–120 °C). This allows the achievement of a marginal round-trip efficiency (electric-to-electric) in the range of 50% (not considering solar heat integration).The TEES system is analysed with different resource conditions and parameters settings (hot storage temperature, pressure levels for all cycles, ambient temperature, etc.), making reference to standard days of each month of the year; exergy and exergo-economic analyses are performed to identify the critical items in the complete system and the cost of stored electricity.

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41

Bamisile, Olusola, Qi Huang, Paul O. K. Anane, and Mustafa Dagbasi. "Performance Analyses of a Renewable Energy Powered System for Trigeneration." Sustainability 11, no. 21 (October 29, 2019): 6006. http://dx.doi.org/10.3390/su11216006.

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In this research, a novel trigeneration powered by a renewable energy (RE) source is developed and analyzed. The trigeneration system is designed to produce electricity, hot water, and cooling using two steam cycles, a gas cycle, hot water chamber, and an absorption cycle. The RE source considered in the scope of this study is biogas generated from chicken manure and maize silage. The energy and exergy analysis of the trigeneration system is performed with the aim to achieve higher efficiencies. The efficiencies are presented based on power generation, cogeneration (electricity and cooling) and trigeneration. The overall trigeneration energy and exergy efficiency for the system developed is 64% and 34.51%. The exergy destruction within the system is greatest in the combustion chamber.

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42

Li, Chengjie, Bin Li, Junying Huang, and Changyou Li. "Energy and Exergy Analyses of a Combined Infrared Radiation-Counterflow Circulation (IRCC) Corn Dryer." Applied Sciences 10, no. 18 (September 10, 2020): 6289. http://dx.doi.org/10.3390/app10186289.

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Energy consumption performance evaluation of an industrial grain dryer is an essential step to check its current status and to put forward suggestions for more effective operation. The present work proposed a combined IRCC dryer with drying capacity of 4.2 t/h that uses a novel drying technology. Moreover, the existing energy–exergy methodology was applied to evaluate the performance of the dryer on the basis of energy efficiency, heat loss characteristics, energy recovery, exergy flow and exegetic efficiency. The results demonstrated that the average drying rate of the present drying system was 1.1 gwater/gwet matter h. The energy efficiency of the whole drying system varied from 2.16% to 35.21% during the drying process. The overall recovered radiant energy and the average radiant exergy rate were 674,339.3 kJ and 3.54 kW, respectively. However, the average heat-loss rate of 3145.26 MJ/h indicated that measures should be put in place to improve its performance. Concerning the exergy aspect, the average exergy rate for dehydration was 462 kW and the exergy efficiency of the whole drying system ranged from 5.16% to 38.21%. Additionally, the exergy analysis of the components indicated that the combustion chamber should be primarily optimized among the whole drying system. The main conclusions of the present work may provide theoretical basis for the optimum design of the industrial drying process from the viewpoint of energetics.

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43

Egware, Henry, Albert I. Obanor, and Harrison Itoje. "Thermodynamic Evaluation of a 42MW Gas Turbine Power Plant." International Journal of Engineering Research in Africa 12 (June 2014): 83–94. http://dx.doi.org/10.4028/www.scientific.net/jera.12.83.

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Energy and exergy analyses were carried out on an active 42MW open cycle gas turbine power plant. Data from the power plant record book were employed in the investigation. The First and Second Laws of Thermodynamics were applied to each component of the gas power plant at ambient air temperature range of 21 - 330C. Results obtained from the analyses show that the energy and exergy efficiencies decrease with increase in ambient air temperature entering the compressor. It was also shown that 66.98% of fuel input and 54.53% of chemical exergy are both lost to the environment as heat from the combustion chamber in the energy and exergy analysis respectively. The energy analysis quantified the efficiency of the plant arising from energy losses , while exergy analysis revealed the magnitude of losses in various components of the plant. Therefore a complete thermodynamic evaluation of gas turbine power plants requires the use of both analytical methods.

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44

Wall, G. "Exergy tools." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 217, no. 2 (January 1, 2003): 125–36. http://dx.doi.org/10.1243/09576500360611399.

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This paper presents a number of exergy-based concepts and methods, e.g. efficiency concepts, exergy flow diagrams, exergy utility diagrams (EUDs), life cycle exergy analysis (LCEA) and exergy economy optimization (EEO). These tools are useful in order to describe, analyse and optimize energy conversion systems.

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45

Motevali, Ali, and Saeid Minaei. "Effects of microwave pretreatment on the energy and exergy utilization in thin-layer drying of sour pomegranate arils." Chemical Industry and Chemical Engineering Quarterly 18, no. 1 (2012): 63–72. http://dx.doi.org/10.2298/ciceq110702047m.

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Energy and exergy analyses may be considered as important tools for design, analysis and optimization of thermal systems. This paper reports on energy and exergy analyses of thin-layer drying of sour pomegranate arils with microwave pretreatment. There were two microwave pretreatments (100W for 20 min and 200 W for 10 min) along with a control treatment (convection drying with no microwave pretreatment). Experiments were carried out at three air temperatures (50, 60 and 70?C) and three air velocities (0.5, 1 and 1.5 m/s). Results showed that energy utilization and energy utilization ratio increased with time, while exergy efficiency decreased. Energy utilization and drying time decreased considerably with microwave pretreatment of pomegranate arils. The minimum values of exergy loss and exergy efficiency were associated with the 200W microwave pretreatment, while they were maximum for control treatment.

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46

Streckienė, Giedrė, and Tomas Kropas. "APPLICATION OF ENERGY AND EXERGY ANALYSIS TO INVESTIGATE THE OPERATION OF AN AIR HANDLING UNIT WITH HEAT PUMP." Mokslas - Lietuvos ateitis 12 (September 21, 2020): 1–6. http://dx.doi.org/10.3846/mla.2020.13064.

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With the growth of energy-efficient building sector, ventilation systems are becoming increasingly important not only of fresh air supply but also in terms of energy consumption. The aim of this paper is to describe and analyse the operation of an air handling unit (AHU) with a heat pump using energy and exergy analyses under the variable environmental temperature (from –30 °C to 10 °C). The application of selected methods is illustrated in a case study of an AHU using environmental temperatures of Vilnius city during heating season (from the beginning of October to the end of April). An analytical method for determining distribution of the environmental (outdoor air) temperature is used. Energy and exergy analyses showed periods when the highest amounts of energy and exergy were consumed and the greatest exergy losses occurred. This allowed to reveal the component of the system with the highest exergy losses – the heat pump evaporator. Therefore, further research is needed for its design and application. At the end of the article, the seasonal indicators of the AHU with heat pump operation were calculated: coefficient of performance and exergy efficiency. The presented research procedure could be applied to the analysis of other energy systems and processes in them.

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Oyedepo, S. O., R. O. Fagbenle, S. S. Adefila, and M. M. Alam. "Performance evaluation of selected gas turbine power plants in Nigeria using energy and exergy methods." World Journal of Engineering 12, no. 2 (April 1, 2015): 161–76. http://dx.doi.org/10.1260/1708-5284.12.2.161.

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This study presents thermodynamic analysis of the design and performance of eleven selected gas turbine power plants using the first and second laws of thermodynamics concepts. Energy and exergy analyses were conducted using operating data collected from the power plants to determine the energy loss and exergy destruction of each major component of the gas turbine plant. Energy analysis showed that the combustion chamber and the turbine are the components having the highest proportion of energy loss in the plants. Energy loss in combustion chamber and turbine varied from 33.31 to 39.95% and 30.83 to 35.24% respectively. The exergy analysis revealed that the combustion chamber is the most exergy destructive component compared to other cycle components. Exergy destruction in the combustion chamber varied from 86.05 to 94.67%. Combustion chamber has the highest exergy improvement potential which range from 30.21 to 88.86 MW. Also, its exergy efficiency is lower than that of other components studied, which is due to the high temperature difference between working fluid and burner temperature. Increasing gas turbine inlet temperature (GTIT), the exergy destruction of this component can be reduced.

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Rosen, Marc A., Ibrahim Dincer, and Norman Pedinelli. "Thermodynamic Performance of Ice Thermal Energy Storage Systems." Journal of Energy Resources Technology 122, no. 4 (September 6, 2000): 205–11. http://dx.doi.org/10.1115/1.1325406.

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The thermodynamic performance of an encapsulated ice thermal energy storage (ITES) system for cooling capacity is assessed using exergy and energy analyses. A full cycle, with charging, storing, and discharging stages, is considered. The results demonstrate how exergy analysis provides a more realistic and meaningful assessment than the more conventional energy analysis of the efficiency and performance of an ITES system. The overall energy and exergy efficiencies are 99.5 and 50.9 percent, respectively. The average exergy efficiencies for the charging, discharging, and storing periods are 86, 60, and over 99 percent, respectively, while the average energy efficiency for each of these periods exceeds 99 percent. These results indicate that energy analysis leads to misleadingly optimistic statements of ITES efficiency. The results should prove useful to engineers and designers seeking to improve and optimize ITES systems. [S0195-0738(00)00904-3]

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El- Ghafour, Sherihan, Nady Mikhael, and Mohamed El- Ghandour. "Energy and Exergy Analyses of Stirling Engine using CFD Approach." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 77, no. 1 (November 7, 2020): 100–123. http://dx.doi.org/10.37934/arfmts.77.1.100123.

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A comprehensive characterization of the GPU-3 Stirling engine losses with the aid of the CFD approach is presented. Firstly, a detailed description of the losses-related phenomena along with the method of calculating each type of loss are addressed. Secondly, an energy analysis of the engine is carried out in order to specify the impact of each type of losses on the performance. Finally, the design effectivity of each component of the engine is investigated using an exergy analysis. The results reveal that the hysteresis loss occurs mainly within the working spaces due to the flow jetting during the first part of the expansion strokes. Additionally, the pressure difference between the working spaces is the main driver for the flow leakage through the appendix gap. The exposure of the displacer top wall to the jet of hot gas flowing into the expansion space during expansion stroke essentially increases the shuttle heat loss. A new definition for the regenerator effectiveness is presented to assess the quality of the heat storage and recovery processes. The energy analysis shows that regenerator thermal loss and pumping power represent the largest part of the engine losses by about 9.2% and 7.5% of the heat input, respectively. The exergy losses within regenerator and cold space are the highest values among the components, consequently, they need to be redesigned.

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GOMRI, Rabah. "Energy and Exergy Analyses of Different Transcritical CO2 Refrigeration Cycles." El-Cezeri Fen ve Mühendislik Dergisi 5, no. 2 (May 31, 2018): 425–36. http://dx.doi.org/10.31202/ecjse.402904.

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