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Journal articles on the topic 'Engineering Equation Solver (EES)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Khamooshi, Mehrdad, Kiyan Parham, Mortaza Yari, Fuat Egelioglu, Hana Salati, and Saeed Babadi. "Thermodynamic Analysis and Optimization of a High Temperature Triple Absorption Heat Transformer." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/980452.

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First law of thermodynamics has been used to analyze and optimize inclusively the performance of a triple absorption heat transformer operating with LiBr/H2O as the working pair. A thermodynamic model was developed in EES (engineering equation solver) to estimate the performance of the system in terms of the most essential parameters. The assumed parameters are the temperature of the main components, weak and strong solutions, economizers’ efficiencies, and bypass ratios. The whole cycle is optimized by EES software from the viewpoint of maximizing the COP via applying the direct search method

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Behar, Omar, Abdallah Khellaf, and Kamal Mohammedi. "A novel parabolic trough solar collector model – Validation with experimental data and comparison to Engineering Equation Solver (EES)." Energy Conversion and Management 106 (December 2015): 268–81. http://dx.doi.org/10.1016/j.enconman.2015.09.045.

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Karneta, Railia, Amin Rejo, Gatot Priyanto, and Rindit Pambayun. "PENENTUAN DIFUSIVITAS PANAS PEMPEK LENJER SELAMA PEREBUSAN MENGGUNAKAN METODE NUMERI (Determination of Thermal Diffusivity Pempek Lenjer during Boiling Using Numerical Methods)." Jurnal Agritech 35, no. 01 (2015): 18. http://dx.doi.org/10.22146/agritech.9415.

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The knowledge of thermal diffusivity coefﬁcient is important in order to determine the proper or optimum time for pempek lenjer processing. Formula and temperature will affect thermal diffusivity. The research objective was to numerically determine thermal diffusivity coefﬁcient of pempek lenjer during boiling. The measured variables were sample temperature measured at pempek center point (r0) = 0 cm, r1= 1 cm, r = 2 c, and time for boiling pempek. Data was analyzed by using 9 and 12 models through computer program of Engineering Equation Solver (EES) Ver 8.91. The results showed that thermal

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Rangel-Hernandez, V., C. Torres, A. Zaleta-Aguilar, and M. Gomez-Martinez. "The Exergy Costs of Electrical Power, Cooling, and Waste Heat from a Hybrid System Based on a Solid Oxide Fuel Cell and an Absorption Refrigeration System." Energies 12, no. 18 (2019): 3476. http://dx.doi.org/10.3390/en12183476.

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This paper applies the Exergy Cost Theory (ECT) to a hybrid system based on a 500 kWe solid oxide fuel cell (SOFC) stack and on a vapor-absorption refrigeration (VAR) system. To achieve this, a model comprised of chemical, electrochemical, thermodynamic, and thermoeconomic equations is developed using the software, Engineering Equation Solver (EES). The model is validated against previous works. This approach enables the unit exergy costs (electricity, cooling, and residues) to be computed by a productive structure defined by components, resources, products, and residues. Most importantly, it

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Silva, Paul Campos Santana, Paulo Henrique Terenzi Seixas, Caroline Rodrigues, Leonardo Fonseca, and Rudolf Huebner. "Experimental and Numerical Analysis Applied on Steel Bars Cooling." Advanced Materials Research 1016 (August 2014): 342–46. http://dx.doi.org/10.4028/www.scientific.net/amr.1016.342.

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AISI 1020 steel bars cooling have been investigated aiming to obtain their cooling rate during heat treatment. Hot steel bars just taken out of the furnace are piled over other ones that were taken out of the furnace earlier. A mathematical model has been created and implemented using the software EES, Engineering Equation Solver. An experiment was conducted to validate the mathematical model. The experiment consists in three loads of three bars each with a time interval of 5 minutes between them. The initial temperature of each bar was 150oC. The mathematical model can obtain the thermal prof

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Baheta, Aklilu T., Sintayehu M. Hailegiorgis, Ahmed N. Oumer, and Shaharin Anwar B. Sulaiman. "Performance Analysis of Transcritical Carbon Dioxide Rankine Cycle with Regenerator." MATEC Web of Conferences 225 (2018): 05020. http://dx.doi.org/10.1051/matecconf/201822505020.

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Transcritical carbon dioxide Rankine cycle (TCRC) has a potential to convert low grade heat source into power. Thus, the objective of this paper is to evaluate TCRC performance based on the first and the second law of thermodynamics for wide and different operating conditions. To address this, TCRC thermal efficiency, exergetic efficiency, utilization ratio and the exergy destruction of the components are analyzed parametrically. Engineering Equation Solver (EES) is used to solve the set of equations and to evaluate the working fluid properties at the given conditions. For the analysis compres

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Coetzee, Rigardt Alfred, Aggrey Mwesigye, and Zhongjie Huan. "Optimal slope angle selection of an evacuated tube collector for domestic solar water heating." Journal of Energy in Southern Africa 28, no. 1 (2017): 104. http://dx.doi.org/10.17159/2413-3051/2017/v28i1a1621.

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A pressurized system utilizing evacuated tube collectors with internal heat pipes was investigated for the production of hot service-water for domestic use during all seasons in Pretoria, South Africa. The investigation focused on the prediction of seasonal hourly performance trends and the maximum thermal performance at the static optimal slope angle. This study was accomplished by developing the system’s theoretical performance model which was solved numerically using Engineering Equation Solver (EES). Results show the thermal performance trend changes during the seasons depending on the slo

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Ihuoma, UV, and EO Diemuodeke. "OPTIMAL EVAPORATING AND CONDENSING TEMPERATURES OF ORGANIC RANKINE CYCLE IN A HOT AND HUMID ENVIRONMENT." Nigerian Journal of Technology 36, no. 1 (2016): 110–18. http://dx.doi.org/10.4314/njt.v36i1.14.

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This paper presents a thermodynamic analysis of an organic Rankine cycle (ORC) in a hot and humid environment. A theoretical procedure is proposed for the determination of the optimal evaporation temperature (OET) and optimal condensing temperature (OCT) of a subcritical ORC plant, which is based on thermodynamic theory; the heat input is selected as the objective function. The OETs and OCTs of 21 working ﬂuids, which comprise wet, isentropic and dry ﬂuids, are determined under given environmental conditions– hot and humid environment. The Engineering Equation Solver (EES) integrated developme

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Al-Sayyab, Ali K. Shaker. "Experimental Evaluation of Window-Type Air-Conditioning Unit with New Expansion Device and R404A Alternative Refrigerant." International Journal of Air-Conditioning and Refrigeration 28, no. 04 (2020): 2050031. http://dx.doi.org/10.1142/s2010132520500315.

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In this study, the performance of a window-type air-conditioning unit with an alternative, ozone-friendly refrigerant was enhanced by incorporating a nozzle instead of a capillary tube as an expansion device. An experimental evaluation was adopted on a 1.5 RT window-type air-conditioning unit with a controlled environmental zone. According to operating conditions, an ANSYS-Fluent program was used to predict an appropriate nozzle size for a lower pressure ratio. The refrigeration cycle model was simulated using the Engineering Equation Solver (EES).27 The results showed that using a nozzle of 3

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Moreira, José Luciano Batista, Marcos Cezar Lima Cordeiro, Rogério Soares da Silva, and Adriano da Silva Marques. "Desenvolvimento de um código computacional para estudo parametrizado no cálculo da carga térmica em uma câmara frigorífica." Research, Society and Development 10, no. 8 (2021): e6910817137. http://dx.doi.org/10.33448/rsd-v10i8.17137.

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As câmaras frigorificas são equipamentos fundamentais para a conservação de alimentos perecíveis, garantindo a manutenção da qualidade dos produtos nas etapas do seu processamento e distribuição. O dimensionamento correto desse equipamento representa eficiência energética relacionada ao desempenho do resfriamento e congelamento. Este trabalho trata do desenvolvimento de um código computacional na plataforma EES (Engineering Equation Solver) para o estudo parametrizado aplicado a espessura do isolante térmico e a temperatura de entrada dos produtos alimentícios. O estudo parametrizado busca dia

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Llinares, C., A. Knebe, and H. Zhao. "Cosmological structure formation under MOND. A new numerical solver for the Poisson’s equation." EAS Publications Series 44 (2010): 57–60. http://dx.doi.org/10.1051/eas/1044010.

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Abdullah, Mohd Haslizam, Saiful Anwar Che Ghani, and Siti Rohaida Mohamed. "Experiment and Numerical Studies on Heat Loss in a Hydro-Distillation with Various Insulations." MATEC Web of Conferences 225 (2018): 02014. http://dx.doi.org/10.1051/matecconf/201822502014.

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In Asia, Agarwood oil is obtained by conventional extraction methods which consume significant energy, amount of solvents, and process time. One of the conventional extraction methods is traditional hydrodistillation using stainless steel distiller covered by concrete. This study evaluates the heat loss during agarwood during agarwood hydro-distillation process with the aim at optimizing it using insulation techniques. Six insulation materials namely, Polyurethane, Aluminum Silicate, Glass Wool, Mineral Wool and Nitrile Rubber have been investigated experimentally and numerically using softwar

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Ahmed Mahmood, Raid. "Case study of liquid suction heat exchanger in a mechanical refrigeration system using alternative refrigerants." International Journal of Engineering & Technology 9, no. 3 (2020): 644. http://dx.doi.org/10.14419/ijet.v9i3.30777.

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This paper investigates the effect of adding a liquid-suction heat exchanger on the performance of a mechanical refrigeration system using alternative refrigerants. Engineering Equation Solver (EES) was used to simulate a mechanical refrigeration system in two configurations: modified system with liquid-suction heat exchanger and system without liquid-suction heat exchanger. The results revealed that the liquid-suction heat exchanger has a significant effect on the system performance as it influences the subcooling and superheating temperatures. The results also showed that the highest value o

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K. Victorin, Chegnimonhan, Aredokou Olorounto Louis, Guidi Tognon Clotilde, and Adomou Alain. "INVESTIGATING THE PERFORMANCE OF A TRANSCRITICAL BOOSTER REFRIGERATION SYSTEM WITHCARBON DIOXIDE IN TROPICAL CLIMATES: THE CASE OF BENIN." International Journal of Advanced Research 9, no. 02 (2021): 226–38. http://dx.doi.org/10.21474/ijar01/12438.

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This article presents a prospective study of low carbon footprint refrigeration systems in tropical climates. A transcritical carbon dioxide booster refrigeration system is simulated within the Engineering Equation Solver (EES) environment. The results are discussed under the weather conditions Cotonou, Benin. The performance of the transcritical booster cycle increases with low ambient temperatures the Coefficient of Performance (COP) increased by 94.2% when the ambient temperature went from 40Â°C to 25Â°C). The gas cooler pressure and the medium pressure were ctoptimised and two correlations

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Shaker Al-Sayyab, Ali K. "Performance Enhancement of Window-Type Air-Conditioning Units." International Journal of Air-Conditioning and Refrigeration 26, no. 02 (2018): 1850012. http://dx.doi.org/10.1142/s2010132518500128.

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In this work, the performance of window-type air-conditioning units was improved. The study was achieved by adding a diffuser at the compressor outlet. An experimental investigation was carried out on 2 RT window-type air-conditioning units with controlled environmental zones. According to the compressor-outlet conditions, an ANSYS-fluent program was used to achieve a suitable diffuser geometry for maximum pressure increase. The refrigeration cycle model was programmed in Engineering Equation Solver (EES). The experimental work shows that using a diffuser of (5[Formula: see text]mm ID [Formula

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Chaudhary, Ghulam Qadar, Rubeena Kousar, Muzaffar Ali, et al. "Small-Sized Parabolic Trough Collector System for Solar Dehumidification Application: Design, Development, and Potential Assessment." International Journal of Photoenergy 2018 (February 21, 2018): 1–12. http://dx.doi.org/10.1155/2018/5759034.

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The current study presents a numerical and real-time performance analysis of a parabolic trough collector (PTC) system designed for solar air-conditioning applications. Initially, a thermodynamic model of PTC is developed using engineering equation solver (EES) having a capacity of around 3 kW. Then, an experimental PTC system setup is established with a concentration ratio of 9.93 using evacuated tube receivers. The experimental study is conducted under the climate of Taxila, Pakistan in accordance with ASHRAE 93-1986 standard. Furthermore, PTC system is integrated with a solid desiccant dehu

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17

Figueredo, Thiago De Souza, João Luiz De Medeiros Neto, Adriano Da Silva Marques, and Carlos Antônio Cabral Dos Santos. "Análise Exergoeconômica de um sistema de trigeração de energia operando com um Ciclo Rankine Orgânico." Revista Principia - Divulgação Científica e Tecnológica do IFPB 1, no. 54 (2021): 20. http://dx.doi.org/10.18265/1517-0306a2021v1n54p20-31.

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<span class="fontstyle0">This work presents the results of the energetic, exergetic and exergoeconomic evaluation of a trigeneration system which is composed of an Organic Rankine Cycle (ORC), a simple effect Absorption Refrigeration System (SRA) and a boiler. The proposed system is driven by the residual heat of an industrial process. A computational code was developed on the EES (Engineering Equation Solver) platform to solve the thermodynamic and exergoeconomic equation of each equipment. The SPECO method (Specific Exergy Costing) was used for the exergoeconomic evaluation. Results in

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Fiori, J. J., C. U. S. Lima, and V. Silveira Jr. "THEORETIC-EXPERIMENTAL EVALUATION OF A CASCADE REFRIGERATION SYSTEM FOR LOW TEMPERATURE APPLICATIONS USING THE PAIR R22/R404A." Revista de Engenharia Térmica 11, no. 1-2 (2012): 07. http://dx.doi.org/10.5380/reterm.v11i1-2.61992.

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This paper presents a thermodynamic analysis of a cascade refrigeration system using the refrigerant R22 as the working fluid in the high temperature circuit (HT) and the refrigerant R404a as the working fluid in the low temperature circuit (LT). The present analysis aimed to obtain the condensing temperature of the LT that provides an optimal value for the coefficient of performance (COP) of the cycle. Parameters involved in the analysis included the evaporation temperature, the condensing temperature and the difference between the condensing temperature of the LT (TC_LT) and evaporation temp

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Bellos, Evangelos, and Christos Tzivanidis. "Investigation of the Environmentally-Friendly Refrigerant R152a for Air Conditioning Purposes." Applied Sciences 9, no. 1 (2018): 119. http://dx.doi.org/10.3390/app9010119.

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Heat pumps are efficient and well-established technologies for providing the proper cooling load in the building sector. The objective of this work is the parametric investigation of a heat pump operating with the promising refrigerant R152a for different operating conditions. More specifically, the heat pump is studied for different ambient temperatures, different indoor temperatures and various compressor rotational speeds. The cooling capacity and the coefficient of performance (COP) are the most important parameters which calculated in every scenario. A detailed model is developed in Engin

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Sharma, Dishant, Gulshan Sachdeva, and Dinesh Kumar Saini. "Optimized Refrigerant Flow Rate and Dimensions of the Ejector Employed in a Modified Ejector Vapor Compression System." International Journal of Air-Conditioning and Refrigeration 28, no. 04 (2020): 2050038. http://dx.doi.org/10.1142/s2010132520500388.

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This paper presents the analysis of a modified vapor compression cooling system which uses an ejector as an expansion device. Expanding refrigerant in an ejector enhances the refrigeration effect and reduces compressor work. Therefore, it yields a better coefficient of performance. Thermodynamic analysis of a constant area ejector model has been done to obtain primary dimensions of the ejector for given condenser and evaporator temperature and cooling capacity. The proposed model has been used to design the ejector for three refrigerants; R134a, R152a and R1234yf. The refrigerant flow rate and

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Nguyen, Phu Minh. "Energy and exergy estimation for a combined cycle of solid CO2 production and NH3-H2O single effect absorption chiller." Science and Technology Development Journal 19, no. 1 (2016): 61–69. http://dx.doi.org/10.32508/stdj.v19i1.611.

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In order to reduce the compression power, to use an integrated thermal-driven cycle, and to mitigate the CO2 content in the air, a new combined cycle of absorption chiller and vaporcompression refrigeration cycle to produce carbon dioxide dry ice was devised and analyzed. In this study, the energy and the exergy analyses of the combined cycle were presented. The combined cycle simulation was carried out by using EES (Engineering Equation Solver) program. The CO2 condensation pressure and the generator temperature were considered as key parameters. Results show that the total compression and pu

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Touaibi, Rabah, Hasan Koten, and Ozlem Boydak. "Parametric Study of an Organic Rankine Cycle Using Different Fluids." Emerging Science Journal 4, no. 2 (2020): 122–28. http://dx.doi.org/10.28991/esj-2020-01216.

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This work is an energy study of an organic Rankine cycle (ORC) for the recovery of thermal energy by comparing three organic fluids. This cycle is considered to be a promising cycle for the conversion of heat into mechanical energy suitable for low temperature heat sources; it uses more volatile organic fluids than water, which generally has high molecular weights, thus allowing operating pressures at temperatures lower than those of the traditional Rankine cycle. A thermodynamic model was developed using the Engineering Equation Solver (EES) software to determine its performance using differe

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Abdulrazzaq Kareem, Fadhil, Mustafa Al-Dulaimi, and Noor Samir Lafta. "Investigation The Exergy Performance of a Forced Draft Wet Cooling Tower." International Journal of Engineering & Technology 7, no. 4 (2018): 2575. http://dx.doi.org/10.14419/ijet.v7i4.16698.

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The performance of a forced draft wet cooling tower was investigated experimentally and the calculation was performed by applying second law of thermodynamics (exergy analysis). The mathematical model was developed by using engineering equation solver (EES) software. The results show that the chemical exergy of air increases from the bottom to the top of the cooling tower, the thermal exergy of air decreases from bottom to the top of the cooling, the exergy of water decreases from top to the bottom of the cooling tower. The exergy destruction decreases from bottom to the top of the cooling tow

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Santos, R. F. M., K. L. Cezar, P. A. C. Rocha, R. J. P. Lima, M. E. V. da Silva, and S. C. S. Alcantara. "TESTS OF ARRANGEMENTS IN A PROTOTYPE OF A STEAM GENERATOR IN AN ABSORPTION REFRIGERATION SYSTEM." Revista de Engenharia Térmica 18, no. 2 (2019): 70. http://dx.doi.org/10.5380/reterm.v18i2.70796.

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This paper presents a proposal to optimize the prototype II of a steam generator, developed by the Cooperativa de Pesquisa Norte/Nordeste de Gas Natural, RECOGÁS - UFPB, which is a component of an absorption refrigeration system of water and lithium bromide triggered by direct burning of natural gas. The optimization was carried out through changes in the arrangement, geometry, and number of the heat exchanger pipes. It was developed a computational code using F-Chart software Engineering Equation Solver® (EES), applying the principles of heat transfer to all the different geometries. As a res

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Duarte, Willian Moreira, Juan Jose Garcia Pabon, Antônio Augusto Torres Maia, and Luiz Machado. "Nonisentropic Phenomenological Model of a Reciprocating Compressor." International Journal of Air-Conditioning and Refrigeration 27, no. 04 (2019): 1950039. http://dx.doi.org/10.1142/s2010132519500391.

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This paper presents the development of a numerical, iterative and nonisentropic model for the thermodynamic processes of a reciprocating compressor of a refrigeration system operating at steady state. The mathematical model was implemented using the scientific software Engineering Equation Solver (EES) and it is based on the application of the energy equations in four regions of the compressor: inlet duct and chambers of pre-compression, compression, and post-compression. The model was validated with experimental data collected from an open-drive reciprocating compressor, operating with the re

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Wang, Jing Fu, Yong Zhang, Wei Wang, and Yong Zhi Zhang. "Comparative Analysis of Electric Power and Steam Loss Rate between Single Flash and Binary Geothermal Power System with Single Screw Expander." Advanced Materials Research 354-355 (October 2011): 325–28. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.325.

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In this paper, cycle efficiency, net electric power and steam lose rate are calculated between the single flash and binary geothermal power system. The prime mover is 10kW single screw expander. These parameters of the single flash system are calculated by rated inlet volume flow rate of the single screw expander. The heat absorption capacity of both systems is determined to be equivalent. The working fluids of binary system are R134a, R245fa, and R600a. Those parameters of binary system are calculated with the condition that the saturated temperature of the working fluid before pump is 22°C.

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Liu, Su, Sang-Tae No, and Jae-Weon Jeong. "Energy Performance Comparison between Liquid-Desiccant-Assisted Air Conditioning System and Dedicated Outdoor Air System in Different Climatic Regions." Energies 12, no. 9 (2019): 1798. http://dx.doi.org/10.3390/en12091798.

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The main purpose of this research is to analyze and compare the energy performance of two different novel air conditioning systems; one is a dedicated outdoor air system (DOAS) with a parallel system and the other is a heat-pump-integrated liquid-desiccant and evaporative-cooling-assisted 100% outdoor air system (HPLD-IDECOAS). It was assumed that office buildings served by each system were located in six cities representing four different climatic regions in China. The hourly thermal loads of the office buildings meeting the local building design codes of each selected city were predicted by

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Kumar, Sumit, Dileep Kumar, Rizwan Ahmed Memon, Majid Ali Wassan, and Sikandar Ali Mir. "Energy and Exergy Analysis of a Coal Fired Power Plant." October 2018 37, no. 4 (2018): 611–24. http://dx.doi.org/10.22581/muet1982.1804.13.

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In this paper, energy and exergy analysis has been conducted on a subcritical coal fired power plant of Wisconsin Power and Light Company, USA to investigate the steam cycle energy and exergy efficiency. The cycle is analyzed by developing a mathematical model using its operating and design parameters. The analysis is performed using EES (Engineering Equation Solver). The energy analysis shows that major share of energy loss occurs in condenser i.e. 72% of total cycle energy loss, whereas, exergy analysis shows that 83.09% total exergy destruction of cycle occurs in boiler.Furthermore, the sim

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Heidari, Mohammad, Shakirudeen Salaudeen, Omid Norouzi, Bishnu Acharya, and Animesh Dutta. "Numerical Comparison of a Combined Hydrothermal Carbonization and Anaerobic Digestion System with Direct Combustion of Biomass for Power Production." Processes 8, no. 1 (2020): 43. http://dx.doi.org/10.3390/pr8010043.

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Two of the methods for converting biomass to fuel are hydrothermal carbonization (HTC) and anaerobic digestion (AD). This study is aimed at designing and analyzing two scenarios for bioenergy production from undervalued biomass (sawdust). In one of the scenarios (direct combustion or DC), raw biomass is burned in a combustor to provide the heat that is required by the Rankine cycle to generate electricity. In the other scenario (HTC-AD), the raw biomass first undergoes HTC treatment. While the solid product (hydrochar) is used to produce power by a Rankine cycle, the liquid by-product undergoe

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Setyawan, Nova Dany, Nugroho Agung Pambudi, Frandhoni Utomo, et al. "Energy and exergy analysis of dry-steam geothermal power plant: Case study in kamojang geothermal power plant unit 2." MATEC Web of Conferences 197 (2018): 08018. http://dx.doi.org/10.1051/matecconf/201819708018.

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The Government of Indonesia is committed to realize a policy of 35,000 Megawatt (MW) of an additional supply of electricity within 5 years (2014-2019). The projection of this capacity is largely supported by fossil fuel power plants and a small portion of renewable energy. One of the renewable energy which currently has great potential in Indonesia is the geothermal. Therefore, improving the capacity of geothermal is needed to support the policy. The Kamojang is one of the largest geothermal power plant in Indonesia with an installed capacity of 235 MW from 5 generating units. The purposes of

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Al-Amir, Qusay R., and Nagham Y. Khudair. "THE ORETICAL ANALYSIS ON THE PERFORMANCE OF BRANCHED GAX CHILLER CYCLE." IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING 18, no. 4 (2019): 550–63. http://dx.doi.org/10.32852/iqjfmme.v18i4.230.

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In this study, a branched GAX absorption cycle operating with NH3-H2O pair has beeninvestigated to assess its performance under steady state conditions. The cycle modeling isimplemented using Engineering Equation Solver (EES) software. Analysis includesequations of mass, species and energy conservation. The analysis is used to simulate a GAXabsorption chiller utilization for air conditioning applications with a nominal capacity of 95TR. This chiller uses solar collectors as heat source. The operating parameters are selected atdifferent values of the heat source temperature (140 - 185°C), conde

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Indira, Sridhar Sripadmanabhan, Chockalingam Aravind Vaithilingam, and Ramsundar Sivasubramanian. "Performance Evaluation of a Hybrid Photovoltaic/Thermoelectric Generator System under Non-Tracking and Tracking Condition." MATEC Web of Conferences 335 (2021): 02009. http://dx.doi.org/10.1051/matecconf/202133502009.

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In this study, the performance of the thermoelectric generator (TEG) modules in converting the excess photovoltaic (PV) temperature to electricity in a hybrid photovoltaic/thermoelectric (PV/TEG) generator system is investigated. A one-dimensional analytical heat transfer model for the hybrid PV/TEG with pin-fin based heat sink is developed in Engineering Equation Solver (EES) and simulated under tracking and non-tracking conditions. The solar irradiance collected by the PV/TEG system under tracking and non-tracking conditions was calculated using the Solar Emulator tool via TracePro software.

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Bensenouci, Ahmed, Mohamed Teggar, Ahmed Medjelled, and Ahmed Benchatti. "Thermodynamic Analysis of Hydrogen Production by a Thermochemical Cycle Based on Magnesium-Chlorine." International Journal of Heat and Technology 39, no. 2 (2021): 521–30. http://dx.doi.org/10.18280/ijht.390222.

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Most thermochemical cycles require complex thermal processes at very high temperatures, which restrict the production and the use of hydrogen on a large scale. Recently, thermochemical cycles producing hydrogen at relatively low temperatures have been developed in order to be competitive with other kinds of energies, especially those of fossil origin. The low temperatures required by those cycles allow them to work with heats recovered by thermal, nuclear and solar power plants. In this work, a new thermochemical cycle is proposed. This cycle uses the chemical elements Magnesium-Chlorine (Mg-C

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Suhas, Upadhyaya, and Gumtapure Veershetty. "PARAMETRIC INVESTIGATION OF ORGANIC RANKINE CYCLE EVAPORATOR FOR LOW TEMPERATURE APPLICATIONS." Journal of Engineering Research [TJER] 16, no. 2 (2019): 130. http://dx.doi.org/10.24200/tjer.vol16iss2pp130-141.

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The present work deals with the development of thermodynamic model of low temperature basic Organic Rankine Cycle (ORC) system and a chevron plate heat exchanger evaporator sub-model using Engineering Equation Solver (EES). Work output is evaluated using the ORC thermodynamic model, while the evaporator sub-model calculates the total surface area of the heat exchanger. Using these mathematical models, the effect of evaporation pressure, expander inlet temperature and pinch point temperature difference (PPTD) on the network output and evaporator cost are studied. In addition to this, the effect

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Pinto, Clara, and Carlos Eduardo Mady. "Exergetic Analysis of Hybrid Photovoltaic - Thermal Solar Collectors Coupled to Organic Rankine Cycles." Civil and Environmental Engineering Reports 28, no. 4 (2018): 1–12. http://dx.doi.org/10.2478/ceer-2018-0046.

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Abstract In this work, the application of hybrid solar modules that combine photovoltaic panels and solar thermal collectors coupled with a low-temperature thermal cycle such as the Organic Rankine Cycle is discussed, their main purpose being an increase in the total electric power production per available area. This work will study the thermal and electrical power production efficiency of the hybrid system, the increase in the PV module electric conversion efficiency due to their cooling through heat transfer to the thermal cycle and the total exergetic efficiency of the system. A simplified

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Cheon, Seong-Yong, Soo-Yeol Yoon, Su Liu, and Jae-Weon Jeong. "Energy-saving potential of dedicated outdoor-air system assisted by vacuum-based membrane dehumidifier." E3S Web of Conferences 111 (2019): 01087. http://dx.doi.org/10.1051/e3sconf/201911101087.

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The proposed research presents a dedicated outdoor-air system (DOAS) integrated with a vacuumbased membrane dehumidifier (VMD). The primary objective of this study was to evaluate the energy-saving potential of the proposed VMD–DOAS combination. VMD–DOAS comprised a membrane-energy exchanger (MEE), dew-point indirect evaporative cooler (DP-IEC), and VMD. VMD possessed a characteristic by virtue of which the dehumidification process was isothermal; i.e., no temperature change was observed during the VMD process. While VMD served to control the dry-air supply, the required target temperature (i.

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Riaz, Fahid, Fu Zhi Yam, Muhammad Abdul Qyyum, et al. "Direct Analytical Modeling for Optimal, On-Design Performance of Ejector for Simulating Heat-Driven Systems." Energies 14, no. 10 (2021): 2819. http://dx.doi.org/10.3390/en14102819.

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This paper describes an ejector model for the prediction of on-design performance under available conditions. This is a direct method of calculating the optimal ejector performance (entrainment ratio or ER) without the need for iterative methods, which have been conventionally used. The values of three ejector efficiencies used to account for losses in the ejector are calculated by using a systematic approach (by employing CFD analysis) rather than the hit and trial method. Both experimental and analytical data from literature are used to validate the presented analytical model with good agree

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Ammar, N. R., and I. S. Sediek. "Thermo-Economic Analysis and Environmental Aspects of Absorption Refrigeration Unit Operation Onboard Marine Vehicles: Ro- Pax Vessel Case Study." Polish Maritime Research 25, no. 3 (2018): 94–103. http://dx.doi.org/10.2478/pomr-2018-0100.

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Abstract Marine diesel engines lose a huge amount of fuel heat content in the form of exhaust gas and jacket cooling water, especially onboard high-powered marine vehicles such as Ro-Pax ships. In this paper, the possibility of using the waste heat of marine diesel engines as a source of heat for air conditioning absorption system is investigated. The thermodynamic analysis, in addition to the environmental and economic analysis of the air condition absorption cycle operated with two heat sources using lithium bromide as absorbent, are performed using the Engineering Equation Solver (EES) soft

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Kareem, Aya H. A. Kareem, and Ali A. F. Al-Hamadan. "Experimental study of Organic Rankine cycle system by using R141b as working fluid." Wasit Journal of Engineering Sciences 8, no. 1 (2020): 21–30. http://dx.doi.org/10.31185/ejuow.vol8.iss1.152.

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Organic Rankine cycle (ORC) is one of the renewable energy to generate power at low temperatures; however, the thermal and physical properties data of the working fluid in this system are limited. In this regards, the experimental study by using R-141b as the working fluid and hot water (i.e. 50°C and 90°C) on the ORC system was conducted in order to evaluate the ORC performance via changing temperatures. Further, the air compressor was modified to act as a multi-vane expander in the ORC system. Energy and exergy analysis of ORC system was done by using Engineering Equation Solver (EES) progra

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Carvalho, F. N., and P. E. L. Barbieri. "Thermoeconomic Simulation of Cascaded and Integrated Vapor Compression-Absorption Refrigeration Systems." Revista de Engenharia Térmica 20, no. 1 (2021): 93. http://dx.doi.org/10.5380/reterm.v20i1.80463.

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The present work is composed by a comparative thermoeconomic analysisbetween two refrigeration systems: Vapor Compression CascadeRefrigeration System (VCCRS) and Integrated Refrigeration System byAbsorption and Vapor Compression (VCACRS). The thermoeconomicanalysis compares the systems under energy, exergy, economic andenvironmental aspects. The development of mathematical models for each ofthe systems is performed through the EES (Engineering Equation Solver)program. The optimized functions are exergy destruction and total cost rate(sum of cost rates of investment, operation, maintenance and

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Ma, Juanli, Ahmad Mhanna, Neil Juan, Monica Brands, and Alan S. Fung. "Effects of Intercooling and Inter-Stage Heat Recovery on the Performance of Two-Stage Transcritical CO2 Cycles for Residential Heating Applications." Energies 12, no. 24 (2019): 4763. http://dx.doi.org/10.3390/en12244763.

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Due to the harmful effects of synthetic refrigerants, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs)n the environment, natural refrigerants like carbon dioxide (CO2) have been attracting great interest. The higher inter-stage superheating of CO2 makes it difficult to predict the effects of the intercooling on heating performance of a two-stage transcritical CO2 cycle. In addition, very little is known about the potential of inter-stage heat rejection recovery in the heating performance enhancement of this cycle. In order to explore the effects of intercooling and inter

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Sen, Ozan, and Ceyhun Yilmaz. "Thermoeconomic Cost Analysis of Solar and Geothermal Energy Powered Cooling and Power Cogeneration." Academic Perspective Procedia 3, no. 1 (2020): 609–18. http://dx.doi.org/10.33793/acperpro.03.01.114.

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In this study, geothermal and solar energy assisted cogeneration energy system has been modeled to supply residences&apos; electricity and cooling requirements. The geothermal water from the geothermal resource and the heat transfer fluid heated in the parabolic collector is used as the heat source in the absorption cooling system. Electricity is generated in the binary power plant with geothermal water and heat transfer fluid from the absorption cooling system. The generated electricity is supplied to the grid. Thermoeconomic analysis of the system is performed by using the Engineering Eq

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Javanshir, Nima, S. M. Seyed Mahmoudi, and Marc A. Rosen. "Thermodynamic and Exergoeconomic Analyses of a Novel Combined Cycle Comprised of Vapor-Compression Refrigeration and Organic Rankine Cycles." Sustainability 11, no. 12 (2019): 3374. http://dx.doi.org/10.3390/su11123374.

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In this study, a cooling/power cogeneration cycle consisting of vapor-compression refrigeration and organic Rankine cycles is proposed and investigated. Utilizing geothermal water as a low-temperature heat source, various operating fluids, including R134a, R22, and R143a, are considered for the system to study their effects on cycle performance. The proposed cycle is modeled and evaluated from thermodynamic and thermoeconomic viewpoints by the Engineering Equation Solver (EES) software. Thermodynamic properties as well as exergy cost rates for each stream are found separately. Using R143a as t

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Javanshir, Nima, Seyed Mahmoudi S. M., M. Akbari Kordlar, and Marc A. Rosen. "Energy and Cost Analysis and Optimization of a Geothermal-Based Cogeneration Cycle Using an Ammonia-Water Solution: Thermodynamic and Thermoeconomic Viewpoints." Sustainability 12, no. 2 (2020): 484. http://dx.doi.org/10.3390/su12020484.

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A cogeneration cycle for electric power and refrigeration, using an ammonia-water solution as a working fluid and the geothermal hot water as a heat source, is proposed and investigated. The system is a combination of a modified Kalina cycle (KC) which produces power and an absorption refrigeration cycle (ARC) that generates cooling. Geothermal water is supplied to both the KC boiler and the ARC generator. The system is analyzed from thermodynamic and economic viewpoints, utilizing Engineering Equation Solver (EES) software. In addition, a parametric study is carried out to evaluate the effect

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Shahzad, Muhammad Kashif, Mirza Abdullah Rehan, Muzaffar Ali, et al. "Cooling Performance Assessment of a Slinky Closed Loop Lake Water Heat Pump System under the Climate Conditions of Pakistan." Processes 7, no. 9 (2019): 553. http://dx.doi.org/10.3390/pr7090553.

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This paper presents an experimental evaluation of a closed loop lake water heat pump (LWHPs) system based on the slinky coiled configuration. Initially, a mathematical model is developed in the Engineering Equation Solver (EES) for the heat pump system and the submerged coils in a lake. System performance is determined for the submerged slinky copper coils under the various operating conditions. Afterwards, parametric analysis is performed considering different influencing parameters, such as the lake water temperature, ambient temperature, and mass flow rate of the circulating fluid at consta

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Chawdhury, M. A., and K. Mahkamov. "Development of a Small Downdraft Biomass Gasifier for Developing Countries." Journal of Scientific Research 3, no. 1 (2010): 51. http://dx.doi.org/10.3329/jsr.v3i1.5613.

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Biomass gasification has been receiving increasing attention as a potential renewable energy source for the last few decades. This attempt involved designing, developing and testing a small downdraft biomass gasifier JRB-1 (6-7 kW) at Durham University, UK. The gasifier was built of stainless steel pipes, sheets and other fittings and tested for wood chips and pellets. The composition, moisture content and consumption of biomass feedstock (3.1 kg/hr for wood chips, 2.9 kg/hr for pellets), temperature inside the reaction zone (950-1150 oC), primary air flow rate (0.0015 m3/s) and exit temperatu

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Darabi, Mohsen, Mohammad Mohammadiun, Hamid Mohammadiun, Saeed Mortazavi, and Mostafa Montazeri. "Simulation and optimization integrated gasification combined cycle by used aspen hysys and aspen plus." International Journal of Scientific World 3, no. 1 (2015): 178. http://dx.doi.org/10.14419/ijsw.v3i1.4583.

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<p>Electricity is an indispensable amenity in present society. Among all those energy resources, coal is readily available all over the world and has risen only moderately in price compared with other fuel sources. As a result, coal-fired power plant remains to be a fundamental element of the world's energy supply. IGCC, abbreviation of Integrated Gasification Combined Cycle, is one of the primary designs for the power-generation market from coal-gasification. This work presents a in the proposed process, diluted hydrogen is combusted in a gas turbine. Heat integration is central to the

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Jr, Ivoni C., Danilo Barreto De Aguiar, and Sandro Germano. "Aplicação de simulação computacional para o aumento de eficiência energética de uma instalação frigorífica." Revista Interdisciplinar de Pesquisa em Engenharia 5, no. 1 (2019): 49–57. http://dx.doi.org/10.26512/ripe.v5i1.19244.

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Aspectos envolvendo a maximização da eficiência energética de uma instalação industrial é um tópico de grande importância, pois atualmente existem onerosas tarifas de energia elétrica e qualquer redução de consumo da mesma, resulta em grandes benefícios tanto para empresa como para a matriz energética do país, visto que unidades frigoríficas têm um grande consumo de eletricidade. Com isso, estas melhorias podem, em alguns casos, ser obtidas apenas através de modificações de condições operacionais da planta, que visam reduzir os desperdícios. Assim, este trabalho tem como objetivo apontar ações

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Riaz, Fahid, Kah Hoe Tan, Muhammad Farooq, Muhammad Imran, and Poh Seng Lee. "Energy Analysis of a Novel Ejector-Compressor Cooling Cycle Driven by Electricity and Heat (Waste Heat or Solar Energy)." Sustainability 12, no. 19 (2020): 8178. http://dx.doi.org/10.3390/su12198178.

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Low-grade heat is abundantly available as solar thermal energy and as industrial waste heat. Non concentrating solar collectors can provide heat with temperatures 75–100 °C. In this paper, a new system is proposed and analyzed which enhances the electrical coefficient of performance (COP) of vapour compression cycle (VCC) by incorporating low-temperature heat-driven ejectors. This novel system, ejector enhanced vapour compression refrigeration cycle (EEVCRC), significantly increases the electrical COP of the system while utilizing abundantly available low-temperature solar or waste heat (below

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Al-Badri, Alaa R., and Zahraa Mohsin Farhan. "A Study on Thermal Effectiveness of Multi-Stages Evaporative Air Cooling." Wasit Journal of Engineering Sciences 8, no. 2 (2020): 1–14. http://dx.doi.org/10.31185/ejuow.vol8.iss2.163.

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The air conditioning system performance is significantly affected by temperature rise which causes continuous increase in electricity consumption and pollution problems to environment. Evaporative cooling systems are characterized by their low energy consumption so that they represent successful potential alternatives to traditional vapor compression air conditioning systems. This study investigates the performance of multi-stages evaporative cooling systems experimentally and theoretically. The experimental set-up is mainly composed of two parts: indirect unit to decrease the air temperature

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