Performance improvements on energy and exergy basis for an ammonia-water absorption refrigeration system in a coffee industry

Yamamoto, Eduardo Yassuji; Silva, Robson Leal da; Higa, Márcio

doi:10.1016/j.seta.2022.102284

Cited by 4 publications

(2 citation statements)

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“…According to Shanmugam and Mital [35], anhydrous ammonia is the most used in large refrigeration systems because it has better physical properties than the competing refrigerants (3 to 10% more efficient). Ammonia is known to have an ozone depletion potential (ODP) and global warming potential (GWP) of zero [35][36][37][38]. For Yamamoto et al [36], the water-ammonia mixture is the natural working fluid par excellence for absorption refrigeration systems and allows a wide range of operating temperatures.…”

Section: Benefits Safety Risks and Remedies Of Using Ammoniamentioning

confidence: 99%

“…Ammonia is known to have an ozone depletion potential (ODP) and global warming potential (GWP) of zero [35][36][37][38]. For Yamamoto et al [36], the water-ammonia mixture is the natural working fluid par excellence for absorption refrigeration systems and allows a wide range of operating temperatures. Because of the above, ammonia is considered a natural refrigerant that decomposes easily in the environment.…”

Section: Benefits Safety Risks and Remedies Of Using Ammoniamentioning

confidence: 99%

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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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