Natural gas based trigeneration system proposal to an ice cream factory: An energetic and economic assessment

Alcântara, S.C.S.; Ochoa, Álvaro; Costa, José Ângelo Peixoto da; Michima, Paula Suemy Arruda; Silva, H.C.N.

doi:10.1016/j.enconman.2019.111860

Cited by 24 publications

(15 citation statements)

References 45 publications

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“…[39] T [7] Condensing temperature at #7 (T o + 10 °C) 35°C [ [11] Inlet chilled water temperature 7°C [34] T [12] Outlet water temperature 12°C [34] b1 a share of the heat of the rectifier and SCA is transferred to the solution recirculating in these devices. The state equations for the thermophysical properties of the NH 3 /H 2 O pair were utilized to determine the pressure levels (P) of the refrigeration system [40].…”

Section: Absorption Refrigeration Unitmentioning

confidence: 99%

“…The determinants for the application of trigeneration technologies have been discussed by Deutsche Gesellschaft für Internationale Zusammenarbeit [5] and include the availability of fuel and technology, legal framework, design philosophy, and costs. In the absence of environmental constraints, the installation of trigeneration systems relies on economic objectives, such as the assessments provided by Carvalho, Lozano, and Serra [6] and Alcântara et al [7]. Trigeneration systems can be evaluated from different viewpoints (e.g., economics, environmental, energy efficiency) and employing various methodologies (e.g., pinch analysis, economic methods, life cycle assessment).…”

Section: Introductionmentioning

confidence: 99%

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Energy, exergy, and exergoeconomic evaluations of a micro-trigeneration system

Marques

Carvalho

Lourenço

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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This study presents energy, exergy, and exergoeconomic assessments for a natural gas-fueled micro-trigeneration unit, which encompasses an internal combustion engine (ICE), an absorption refrigeration system (ammonia-water), and a heat recovery unit. The energy system is designed to meet the electricity and cooling demands of a university building, while heat is directed to a biodiesel plant located on site. The analyses comprehended energy and exergy parameters (first and second laws of thermodynamics). Then, the SPECO methodology was applied for the exergoeconomic assessment, which associates monetary values with exergy flows. The ICE presented the highest irreversibility (61.24 kW) and the highest cost of exergy destruction (21.56 BRL/h), followed by the steam generator (5.52 kW and 6.71 BRL/h, respectively). The exergoeconomic assessment indicated the components that could benefit from improvements: steam generator (cooling of exhaust gases before entry into the generator) and the heat exchanger of the absorber (substitution of the exchanger and/or pre-heating of input air). This study contributes to narrow the knowledge gap regarding the exergoeconomic assessment of compact trigeneration systems, besides making a case for the utilization of ICE as prime movers.

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Section: Absorption Refrigeration Unitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy, exergy, and exergoeconomic evaluations of a micro-trigeneration system

Marques

Carvalho

Lourenço

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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“…Furthermore, natural gas is preferred by stakeholders and politicians, as geopolitics often plays an important role in choosing the appropriate energy source [17]. Natural gas as a primary source of energy for the absorption chiller is a promising solution as it presents useful results with high efficiency and a good financial return (simple payback of 3.4 years) [18]. When associated with thermal waste as a source secondary energy allows the reduction of the consumption rate of natural gas allowing a reduction in the annual operating cost.…”

Section: Resultsmentioning

confidence: 99%

“…They are efficient, when the PVT system is used, its efficiency is maximized. [14] The economy depends on each country's energy prices and energy policy [18] Even being renewable, electricity as SAE, has a socioenvironmental impact [5]…”

Section: Electric Chiller -Solar Energymentioning

confidence: 99%

Technologies for Air Condiotioning Powered by Alternative Energy Sources a Brief Review

Santos¹,

Santos²

2021

Blucher Engineering Proceedings

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Air conditioning systems have been widely applied to promote human comfort and this can represent an energy consumption of up to 30% in building. Although electric chillers are still widely used for thermal comfort, absorption chillers have proved to be a promising alternative for air conditioning by using renewable energy sources (solar energy, natural gas, waste heat, geothermal and biomass). Taking these considerations into account, the search for efficient, economic and ecological solutions becomes evident. This article proposes a brief bibliographical review on chillers powered by alternative energy sources to electricity. Awareness of the application of alternative energy sources in these systems contributes to sustainable practice and the diversification of the energy matrix.

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“…A waste heat recovery scheme for a submarine was proposed in Reference [67] to harness heat from exhaust gases and cooling jacket water and drive a mixed effect absorption chiller. Following the same concept, exhaust gases from a natural gas engine were used in a recovery boiler in Reference [68], producing steam and hot water. The latter was used to drive an absorption chiller in a trigeneration system that met the energy demands of an ice cream factory.…”

Section: Thermodynamic Resultsmentioning

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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Natural gas based trigeneration system proposal to an ice cream factory: An energetic and economic assessment

Cited by 24 publications

References 45 publications

Energy, exergy, and exergoeconomic evaluations of a micro-trigeneration system

Energy, exergy, and exergoeconomic evaluations of a micro-trigeneration system

Technologies for Air Condiotioning Powered by Alternative Energy Sources a Brief Review

Exergoeconomic Assessment of a Compact Electricity-Cooling Cogeneration Unit

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