On the consideration of different dead states in the exergy assessment of a solar-assisted combined cooling, heat and power system

Cavalcanti, Eduardo José Cidade; Ferreira, João Victor M.; Carvalho, Mónica

doi:10.1016/j.seta.2021.101361

Cited by 4 publications

(3 citation statements)

References 27 publications

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“…The advantage of exergy analysis is that when there are issues with the heat exchanger pinch point, the value of exergy destruction generated is negative, which is inconsistent. This behavior was reported by [30].…”

Section: Resultssupporting

confidence: 79%

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Tackling Dissipative Components Based on the SPECO Approach: A Cryogenic Heat Exchanger Used in Natural Gas Liquefaction

Cavalcanti

Carvalho

2021

Energies

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The cryogenic industry has been experiencing continuous progress in recent years, primarily due to the global development of oil and gas activities. Natural gas liquefaction is a cryogenic process, with the refrigeration system being crucial to the overall process. The objective of the study presented herein is to carry out an exergoeconomic assessment for a dual nitrogen expander process used to liquefy natural gas, employing the SPecific Exergy COsting (SPECO) methodology. The air coolers and throttling valve are dissipative components, which present fictitious unit cost rates that are reallocated to the final product (Liquefied Natural Gas). The liquefaction process has an exergy efficiency of 41.89%, and the specific cost of liquefied natural gas is 292.30 US$/GJ. It was verified that this cost increased along with electricity. The highest exergy destruction rates were obtained for Expander 1 and Air cooler 2. The highest average cost per exergy unit of fuel was obtained for the vertical separator, followed by Air coolers 1 and 2. An assessment of the exergoeconomic factor indicated that both expanders could benefit from a decrease in exergy destruction, improving the exergoeconomic performance of the overall system. Regarding the relative cost difference, all compressors presented high values and can be enhanced with low efforts.

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Section: Resultssupporting

confidence: 79%

“…This usually occurs in absorption cooling systems that employ LiBr solutions. This was discussed in detail by [30].…”

Section: Heat Exchangermentioning

confidence: 93%

Tackling Dissipative Components Based on the SPECO Approach: A Cryogenic Heat Exchanger Used in Natural Gas Liquefaction

Cavalcanti

Carvalho

2021

Energies

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“…This article fills the gap between trigeneration power and cooling energy production. As in the case of cogeneration of heat and electricity, the more heat is generated, the less power is produced [29,30]. The same can be said for cooling and power cogeneration.…”

Section: Introductionmentioning

confidence: 98%

Effects of Coupling Combined Heat and Power Production with District Cooling

et al. 2023

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Over the past decades, combined heat and power production (CHP) has proven itself to be an efficient means of meeting both heat and power demands. However, high efficiency can be achieved with CHP plants when the heat load is sufficient, while lower-priority CHP plants must deal with the excess heat associated with power generation. This excess heat can be used for district cooling with absorption chillers. Although the absorption chiller is an efficient technology for using excess heat for cooling generation, its efficiency is very sensitive to driving hot water temperature. This paper provides a detailed analysis of how cooling generation in CHP plants using absorption chillers affects power generation and primary energy consumption. This study is based on the operational parameters of the Mustamäe CHP plant (Tallinn, Estonia) and the cooling demand of the Tehnopol science and business campus and proposes a sufficient cooling production capacity based on the estimation of the campus’ cooling demand. Additional cooling production opportunities to meet district cooling demand are discussed and compared in this paper in terms of primary energy savings and economic profit. The study finds that for the effective use of CHP excess heat and efficient cooling production, the use of an 0.8 MW absorption cooler and 11.6 MW heat pumps is recommended. This system would use 1.9 times less primary energy for cooling generation than local cooling.

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Biodiesel Production from Microalgae: Exergy Analysis Using Specific Exergy Costing Approach

2023

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On the consideration of different dead states in the exergy assessment of a solar-assisted combined cooling, heat and power system

Cited by 4 publications

References 27 publications

Tackling Dissipative Components Based on the SPECO Approach: A Cryogenic Heat Exchanger Used in Natural Gas Liquefaction

Tackling Dissipative Components Based on the SPECO Approach: A Cryogenic Heat Exchanger Used in Natural Gas Liquefaction

Effects of Coupling Combined Heat and Power Production with District Cooling

Biodiesel Production from Microalgae: Exergy Analysis Using Specific Exergy Costing Approach

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