Implementation of the characteristic equation method in quasi-dynamic simulation of absorption chillers: Modeling, validation and first results

Alcântara, S.C.S.; Lima, Álvaro Augusto Soares; Ochoa, Álvaro; Leite, Gustavo de Novaes Pires; Costa, José Ângelo Peixoto da; Santos, Carlos Antônio Cabral; Cavalcanti, Eduardo José Cidade; Michima, Paula Suemy Arruda

doi:10.1016/j.ecmx.2021.100165

Cited by 5 publications

(2 citation statements)

References 49 publications

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“…This study shows that the so-called renewable sources can be used to operate such types of systems. Alcantara et al [28] developed a mathematical model to simulate the behavior of absorption coolers with NH3/LiNO3 working fluid. An additional component known as a "rectifier" is essential to purify the refrigerant before entering the Numerous studies in the literature delve into diffusion-absorption refrigeration machines, exploring their utilization with diverse energy sources.…”

Section: Introductionmentioning

confidence: 99%

Innovative Multigeneration System with Heat Exchangers for Harnessing Thermal Energy from Cement Kiln Exhaust Gases

Mungyeko Bisulandu,

Mansouri,

Tsimba Mboko

et al. 2024

Energies

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This article introduces a novel multiple-cycle generation system for efficient heat recovery at high and low temperatures. The system is modeled and optimized using the M2EP analysis method (mass, energy, exergy, and performance) and the particle swarm optimization algorithm. The multigeneration system produces electricity, cold, domestic hot water, and biogas by utilizing Kalina cycles, diffusion–absorption refrigeration machines, and high-performance heat exchangers by harnessing waste heat from cement kiln exhaust gases. The Kalina cycle is employed for electricity generation, wherein the H2O+NH3 mixture, heated by hot water, circulates through heat exchangers. Downstream of the Kalina cycle, the refrigeration machine generates cold by evaporating the strong solution of the H2O+NH3 mixture. Hydrogen circulates in the diffusion–absorption refrigerator (DAR) circuit, facilitating the exchange between the evaporator and the absorber. The domestic hot water and biogas production systems operate at lower temperatures (around 45 °C). The simulation results for the Kalina cycle indicate an electrical energy production of 2565.03 kW, with a release of usable energy (residual gases) estimated at 7368.20 kW and a thermal efficiency of 22.15%. Exergy destruction is highest at heat exchanger 1, accounting for 26% of the total. A coefficient of performance of 0.268 and an evaporator temperature of 10.57 °C were obtained for the DAR cycle. The absorber contributes the most to energy exchanges, comprising 37% of the entire circuit. Summarizing the potential for valorizing waste heat from cement kilns, this article lays the foundation for future research.

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Section: Introductionmentioning

confidence: 99%

Innovative Multigeneration System with Heat Exchangers for Harnessing Thermal Energy from Cement Kiln Exhaust Gases

Mungyeko Bisulandu,

Mansouri,

Tsimba Mboko

et al. 2024

Energies

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“…They performed a refrigeration machine performance study, making mixtures of organic fluids trifluoroethanol (TFE)-tetraethylene glycol dimethyl ether (TEGDME or E181) and methanol-TEGDME. Alcântara et al [45] focused on developing a mathematical model capable of simulating the quasi-dynamic behavior of absorption chillers using NH 3 /LiNO 3 as the working fluid. Srikhirin et al [13] stated that when a volatile absorbent such as water/NH 3 is used, the system requires an additional component called a "rectifier," which will purify the refrigerant before entering the condenser.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Absorption Refrigeration Systems: An Overview of Thermal Mechanisms and Models

2023

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The energy transition, originating in the limitation of fossil resources and greenhouse gas (GHG) emission reduction, is the basis of many studies on renewable energies in different industrial applications. The diffusion absorption refrigeration machines are very promising insofar as they allow the use of renewable resources (solar, geothermal, waste gas, etc.). This technology is often considered an alternative to vapor compression systems in cooling and refrigeration applications. This paper aims to overview the thermal mechanisms related to modeling system energy sources and highlight the primary methodologies and techniques used. We study and analyze the technology’s current challenges and future directions and, finally, identify the gaps in the existing models to pave the way for future research. The paper also gives a classification of absorption refrigeration systems (ARS) to position and limit the scope of the study. The paper will help researchers who approach the various aspects to have a global synthetic analysis of the mechanisms characterizing the modeling of energy sources of absorption refrigeration machines.

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Performance assessment of a solar-assisted absorption-compression system for both heating and cooling

et al. 2022

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Implementation of the characteristic equation method in quasi-dynamic simulation of absorption chillers: Modeling, validation and first results

Cited by 5 publications

References 49 publications

Innovative Multigeneration System with Heat Exchangers for Harnessing Thermal Energy from Cement Kiln Exhaust Gases

Innovative Multigeneration System with Heat Exchangers for Harnessing Thermal Energy from Cement Kiln Exhaust Gases

Diffusion Absorption Refrigeration Systems: An Overview of Thermal Mechanisms and Models

Performance assessment of a solar-assisted absorption-compression system for both heating and cooling

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