scholarly journals Análise Exergoeconômica de um sistema de trigeração de energia operando com um Ciclo Rankine Orgânico

2021 ◽  
Vol 1 (54) ◽  
pp. 20
Author(s):  
Thiago De Souza Figueredo ◽  
João Luiz De Medeiros Neto ◽  
Adriano Da Silva Marques ◽  
Carlos Antônio Cabral Dos Santos
Keyword(s):  
Steam Generator ◽  
Organic Rankine Cycle ◽  
Industrial Process ◽  
Rankine Cycle ◽  
Exergy Destruction ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Simple Effect ◽  
Absorption Refrigeration System ◽  
Residual Heat

<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 indicated which equipment needs optimization in order of priority. The results show that the greatest destruction of exergy occurs in the ORC steam generator (56% of the total), followed by the condenser that presented an exergy destruction of 33%. Conversely, the pump and expander performed better, with low exergy destruction values. The results of the exergoeconomic evaluation also indicate that the steam generator and condenser from ORC need to be optimized before any other equipment, as they obtained the lowest values of the exergoeconomic factor (f</span><span class="fontstyle0">k</span><span class="fontstyle0">) and the highest values of the specific relative cost (r</span><span class="fontstyle0">k</span><span class="fontstyle0">).</span> <br /><br />

scholarly journals TESTS OF ARRANGEMENTS IN A PROTOTYPE OF A STEAM GENERATOR IN AN ABSORPTION REFRIGERATION SYSTEM

2019 ◽  
Vol 18 (2) ◽  
pp. 70
Author(s):  
R. F. M. Santos ◽  
K. L. Cezar ◽  
P. A. C. Rocha ◽  
R. J. P. Lima ◽  
M. E. V. da Silva ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Steam Generator ◽  
Lithium Bromide ◽  
Heat Transfer Process ◽  
Heat Flow Rate ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Governing Factor ◽  
Absorption Refrigeration System ◽  
Internal Convection

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 result, their respective coefficients of heat transfer, heat flow rate and other parameters of the process were obtained. The findings are organized in a table and represented in graphs generated by the EES software, allowing to verify which factors had a greater influence on the process, as well as the most efficient geometries. Internal convection was identified as the governing factor in the heat transfer process. Some of the geometries presented satisfactory values to the product of overall heat transfer coefficient and surface area (UA) and also to the heat transfer rate in the steam generator. Other ones presented a better thermal efficiency relation with the amount of volume occupied in the steam generator. Some geometries did not present satisfactory values under any aspect.

scholarly journals A New Computational Tool for the Development of Advanced Exergy Analysis and LCA on Single Effect LiBr–H2O Solar Absorption Refrigeration System

Lubricants ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 76
Author(s):  
José Cabrera César ◽  
Jean Caratt Ortiz ◽  
Guillermo Valencia Ochoa ◽  
Rafael Ramírez Restrepo ◽  
José R. Nuñez Alvarez
Keyword(s):  
Cooling System ◽  
Solar Irradiation ◽  
Solar Array ◽  
Maximum Relative Error ◽  
Exergy Destruction ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Single Effect ◽  
Absorption Refrigeration System ◽  
Hourly Basis

A single effect LiBr–H2O absorption refrigeration system coupled with a solar collector and a storage tank was studied to develop an assessment tool using the built-in App Designer in MATLAB®. The model is developed using balances of mass, energy, and species conservation in the components of the absorption cooling system, taking into account the effect of external streams through temperature and pressure drop. The whole system, coupled with the solar energy harvesting arrangement, is modeled for 24 h of operation with changes on an hourly basis based on ambient temperature, cooling system load demand, and hourly solar irradiation, which is measured and recorded by national weather institutes sources. Test through simulations and validation procedures are carried out with acknowledged scientific articles. These show 2.65% of maximum relative error on the energy analysis with respect to cited authors. The environmental conditions used in the study were evaluated in Barranquilla, Colombia, with datasets of the Institute of Hydrology, Meteorology and Environmental Studies (IDEAM), considering multiannual average hourly basis solar irradiation. This allowed the authors to obtain the behavior of the surface temperature of the water in the tank, COP, and exergy efficiency of the system. The simulations also stated the generator as the biggest source of irreversibility with around 45.53% of total exergy destruction in the inner cycle without considering the solar array, in which case the solar array would present the most exergy destruction.

Modeling and Simulation of the Absorber of an Absorption Refrigeration System

2018 ◽  
Author(s):  
Leonardo Cavalheiro Martinez ◽  
Wellington Balmant ◽  
Iago Costa ◽  
Matias Nicolas Muñoz ◽  
Luiz Rigatti ◽  
...  
Keyword(s):  
Modeling And Simulation ◽  
Absorption Refrigeration ◽  
Refrigeration System ◽  
Absorption Refrigeration System
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