Modeling and simulation of cogeneration systems for buildings on a university campus in Northeast Brazil – A case study

Silva, H.C.N.; Dutra, José Carlos Charamba; Costa, José Ângelo Peixoto da; Villa, Alvaro Antonio Ochoa; Santos, Carlos Antônio Cabral; Araújo, M.M.D.

doi:10.1016/j.enconman.2019.02.062

Cited by 27 publications

(8 citation statements)

References 68 publications

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“…The search for systems with better thermal performance, not only of the fluid used, but with the modification of the cycle through the introduction of a component has been done, as shown by Zacarías et al [77] with the addition of several absorbers, or with the use of more compact exchangers [26,27,76,88] or by the integration of ejectors into the system [84], or simply through joining refrigeration systems by vapor compression and absorption [80,89], integration of cycles in the production of electricity and cold [136], and obviously in the use of these ARS in energy polygeneration plants, analyzed and verified technically and financially [67,137].…”

Section: Final Considerations On the Absorption Refrigeration Systems...mentioning

confidence: 99%

“…The The reuse of energy and renewable energy represent viable alternatives for technological development and expansion of the world energy matrix. In this context, the use of thermodynamic tools that allow the quantification and qualification of energy and its availability have been applied in the literature [67], more specifically, to verify technical feasibility, such as the use of thermal waste to activate absorption chillers [68,69].…”

Section: Experimental Assessment On Absorption Chillermentioning

confidence: 99%

“…Several studies have investigated and analyzed compact heat exchangers as a way to reduce the amount of working fluid, as well as reducing the global size of the system, and therefore costs, by the use of compact components in absorption refrigeration systems to use low-temperature sources for the activation [26,85]. Additionally, due to the increasing performance of the refrigeration systems and reduction in energy consumption, new configurations are possible, such as adding multiple absorbers [77], compact heat exchanger components [26,27,76,88] or including ejectors of the systems [84], or combining sorption and mechanical compression systems [80,89], or integrating different systems to use polygeneration plants [67,90].…”

Section: Theoretical and Numerical Assessment On Absorption Chillermentioning

confidence: 99%

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Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications

et al. 2020

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The interest in employing absorption refrigeration systems is usually related to electricity’s precariousness since these systems generally use thermal rejects for their activation. The application of these systems is closely linked to the concept of energy polygeneration, in which the energy demand to operate them is reduced, which represents their main advantage over the conventional vapor compression system. Currently, the solution pairs used in commercial absorption chillers are lithium bromide/water and ammonia/water. The latter pair has been used in air conditioning and industrial processes due to the ammonia operation’s low temperature. Few review papers on absorption chillers have been published, discussing the use of solar energy as the input source of the systems, the evolution of the absorption refrigeration cycles over the last decades, and promising alternatives to increase the performance of absorption refrigeration systems. There is a lack of consistent studies about designing requirements for absorption chillers, so an updated review covering recent advances and suggested solutions to improve the use and operation of those absorption refrigeration systems using different working fluids is relevant. Hence, this presents a review of the state-of-the-art of ammonia/absorbent based absorption refrigeration systems, considering the most relevant studies, describing the development of this equipment over the years. The most relevant studies in the open literature were collected to describe this equipment’s development over the years, including thermodynamic properties, commercial manufacturers, experimental and numerical studies, and the prototypes designed and tested in this area. The manuscript focuses on reviewing studies in absorption refrigeration systems that use ammonia and absorbents, such as water, lithium nitrate, and lithium nitrate plus water. As a horizon to the future, the uses of absorption systems should be rising due to the increasing values of the electricity, and the environmental impact of the synthetic refrigerant fluids used in mechanical refrigeration equipment. In this context, the idea for a new configuration absorption chiller is to be more efficient, pollutant free to the environment, activated by a heat substantiable source, such as solar, with low cost and compactness structure to attend the thermal needs (comfort thermal) for residences, private and public buildings, and even the industrial and health building sector (thermal processes). To conclude, future recommendations are presented to deal with the improvement of the refrigeration absorption chiller by using solar energy, alternative fluids, multiple-effects, and advanced and hybrid configurations to reach the best absorption chiller to attend to the thermal needs of the residential and industrial sector around the world.

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Section: Final Considerations On the Absorption Refrigeration Systems...mentioning

confidence: 99%

Section: Experimental Assessment On Absorption Chillermentioning

confidence: 99%

Section: Theoretical and Numerical Assessment On Absorption Chillermentioning

confidence: 99%

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Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications

et al. 2020

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“…1A, pp. 95-106 the uses of the thermo-economic analysis to verify the viability of the cogeneration systems have been used and applied along with different thermal plants [12,13], aiming the best proposal to generate steam, electricity, and chilled water for the ice factory industry [14], to generate enough energy for achieving the demand of the swimming pool indoor buildings [15] or even to generate air cooling and electricity for buildings in the university [16,17]. Since the thermo-economic analysis aims to investigate the energetic technical parameters and also the financial indices to estimate if any thermal plant would be feasibly or not [18], the needs to search for the ideal input configuration in terms of the energetic and economic domain have been mentioned in many studies on polygeneration systems, as it could be seen in [19,20].…”

Section: Introductionmentioning

confidence: 99%

Thermo-economic analysis and optimization of the steam absorption chiller network plant

et al. 2022

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Absorption chillers are one of the most used equipment in industrial, commercial, and domestic applications. For the places where high cooling is required, they are utilized in a network to perform the cooling demand. The main objective of the current study was to find the optimum operating conditions of a network of steam absorption chillers according to energy and economic viewpoints. Firstly, energy and economic analysis and modeling of the absorption chiller network were carried out to have a deep understanding of the network and investigate the effects of operating conditions. Finally, the particle swarm optimization search algorithm was employed to find an optimum levelized total costs of the plant. The absorption chiller network plant of the Marun Petrochemical Complex in Iran was selected as a case study. To verify the simulation results, the outputs of energy modeling were compared with the measured values. The comparison with experimental results indicated that the developed model could predict the working condition of the absorption chiller network with high accuracy. The economic analysis results revealed that the levelized total costs of the plant is 1730 $/kW and the payback period is three years. The optimization findings indicated that working at optimal conditions reduces the levelized total costs of the plant by 8.5%, compared to the design condition.

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“…Compact combined cooling and power systems, which couple a combustion engine or gas turbine to an absorption refrigeration system, are considered a suitable alternative to single-generation systems [1,2]. This arrangement can also be referred to as compact electricity-cooling cogeneration systems, and has been applied to industries [3,4], the tertiary sector [5][6][7] such as in supermarkets and shopping centers, and also to meet the domestic energy demands of residential buildings [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Exergoeconomic Assessment of a Compact Electricity-Cooling Cogeneration Unit

et al. 2020

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This study applies the SPecific Exergy COsting (SPECO) methodology for the exergoeconomic assessment of a compact electricity-cooling cogeneration system. The system utilizes the exhaust gases from a 126 hp Otto-cycle internal combustion engine (ICE) to drive a 5 RT ammonia–water absorption refrigeration unit. Exergy destruction is higher in the ICE (67.88%), followed by the steam generator (14.46%). Considering the cost of destroyed exergy plus total cost rate of equipment, the highest values are found in the ICE, followed by the steam generator. Analysis of relative cost differences and exergoeconomic factors indicate that improvements should focus on the steam generator, evaporator, and absorber. The cost rate of the fuel consumed by the combustion engine is 12.84 USD/h, at a specific exergy cost of 25.76 USD/GJ. The engine produces power at a cost rate of 10.52 USD/h and specific exergy cost of 64.14 USD/GJ. Cooling refers to the chilled water from the evaporator at a cost rate of 0.85 USD/h and specific exergy cost of 84.74 USD/GJ. This study expands the knowledge base regarding the exergoeconomic assessment of compact combined cooling and power systems.

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Modeling and simulation of cogeneration systems for buildings on a university campus in Northeast Brazil – A case study

Cited by 27 publications

References 68 publications

Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications

Absorption Refrigeration Systems Based on Ammonia as Refrigerant Using Different Absorbents: Review and Applications

Thermo-economic analysis and optimization of the steam absorption chiller network plant

Exergoeconomic Assessment of a Compact Electricity-Cooling Cogeneration Unit

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