Exergoeconomic Assessment of a Compact Electricity-Cooling Cogeneration Unit

Marques, Adriano; Carvalho, Mónica; Ochoa, Álvaro; Souza, Ronelly; Santos, Carlos Antônio Cabral

doi:10.3390/en13205417

Cited by 13 publications

(10 citation statements)

References 98 publications

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“…Exergy economic evaluation is a good way to evaluate the cost and efficiency of a thermal system [16]. Exergy balance and exergy financial balance equation combined with Equations ( 22)- (24) [17,18]. can be used to calculate the exergy carried by each working medium flow of the system, fuel exergy rate of each equipment, exergy rate of products and capital investment cost rate.…”

Section: Exergoeconomic Modelmentioning

confidence: 99%

Exergoeconomic and Exergoenvironmental Analysis of a Novel Power and Cooling Cogeneration System Based on Organic Rankine Cycle and Ejector Refrigeration Cycle

Tao

Wang

et al. 2022

Energies

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A novel combined power and refrigeration system is proposed based on organic Rankine and jet refrigeration cycles. The system has a wider application range and can be adjusted to different cooling and evaporation temperatures. To meet the needs of diverse populations, the cooling and evaporation temperature can be as low as −60 degrees Celsius. The genetic algorithm is used to optimize the system, and the proposed system’s energy, exergy, economy, and environment are analyzed under optimal conditions. The results desmonstrate that the exergy damage, environmental impact rate, and exergy economic coefficient of steam turbine are the largest. The system’s exergy damage and the turbine’s investment cost are reduced, and the system’s performance is improved. The condenser has the greatest potential for improvement and should be considered a priority component for system improvement. In addition, the system parameters are analyzed. Higher low-pressure steam generation temperature, dryness of low-pressure steam generator outlet, turbine steam extraction ratio, refrigeration evaporation temperature, and compressor compression ratio are advantageous to system cooling capacity output but not the system net power.High-pressure evaporation temperature is unfavorable to the system’s output of net power and cooling capacity. Still, it is beneficial to improve the thermal and energy efficiency of the system. Under the same operating conditions, compared with the system proposed by predecessors, the system’s net power is increased by 12.52 kW, the thermal efficiency is increased by 4.27%, and the energy efficiency is increased by 2.57%. The system was optimized by taking low-pressure evaporation temperature, high-pressure evaporation temperature, outlet dryness of low-pressure steam generator, suction ratio of steam turbine and compression ratio of compressor as decision variables, and thermal efficiency, exergy efficiency, SUCP and SUEP as objective functions. The low-pressure evaporation temperature, high-pressure evaporation temperature, outlet dryness of low-pressure steam generator, suction ratio of steam turbine, and compression ratio of compressor are 357.99 K, 385.72 K, 0.1, and 0, respectively. The system thermal efficiency is 15.01%, exergy efficiency is 43.18%, SUCP is 45.525USD/MWh, and SUEP is 5122.6 MPTS/MWh.

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Section: Exergoeconomic Modelmentioning

confidence: 99%

Exergoeconomic and Exergoenvironmental Analysis of a Novel Power and Cooling Cogeneration System Based on Organic Rankine Cycle and Ejector Refrigeration Cycle

Tao

Wang

et al. 2022

Energies

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“…Exergy destruction assessment and methods for minimizing this value are other procedures researchers applied. For instance, when a cooling cycle's exergy was examined, Marques et al [ 98 ] reported that the highest exergy destruction belonged to the steam generator in the case that only a single-stage absorption chiller was analyzed. Also, Tenkeng et al [ 99 ] reported that the generator should be optimized for a double-stage absorption chiller to reach lower exergy destruction due to the highest exergy loss in this component.…”

Section: Photovoltaic Thermal Collectors In Refrigeration Cyclesmentioning

confidence: 99%

“…They showed that positive impacts were the higher output power and the higher energy conversion efficiency [ 111 ] Ghorbani et al Exergy PVT and ejector refrigeration and PCM The highest exergy destruction belonged to heat exchangers in the hybrid setup, and the least exergy efficiency was for expansion valves [ 104 ] Toujani and Bouaziz Exergy PVT cooling with different working fluid The effect of utilizing organic fluid mixture (R236fa/DMAC) in the system compared to ammonia-water showed significant improvement [ 103 ] Khordehgah et al Exergy PVT with domestic hot water One of the parameters that should be considered in designing PVT is panel temperature. Also, by decreasing panel temperature by about 20%, electrical efficiency increased about 12% [ 96 ] Zarei et al Simulation PVT for domestic application The numerical study by EES for the ejector-compression cycle, with the two refrigerants: R600a and R290 [ 121 ] Marques et al Exergy Exergoeconomic of Electricity-Cooling Unit They reported that the highest exergy destruction belonged to a steam generator in the case that only a single-stage absorption chiller was analyzed [ 98 ] Hu et al Experimental Performance characteristics of PVT They reported that evacuated flat plate PVT compared to the standard flat plate had better effect and efficiency [ 109 ] Noro and Lazzarin Experimental Comparison of PVT and ETC They conducted a study to combine evacuated tube collectors and PVT, and they showed that greater efficiency in this setup could be obtained [ ...…”

Section: Photovoltaic Thermal Collectors In Refrigeration Cyclesmentioning

confidence: 99%

Photovoltaic and Photovoltaic Thermal Technologies for Refrigeration Purposes: An Overview

Alsagri

2022

Arab J Sci Eng

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Refrigeration systems have a broad range of applications, playing a critical role in human life. Especially, vaccine preservation in rural regions has become more critical than in the past during the COVID19 era. In this sense, meeting the cooling process's energy need with renewable energy is critical, as the grid cannot support it. Thus, solar energy has been extensively studied for use in refrigeration cycles. Compression, absorption, adsorption, desiccant, and ejector refrigeration cycles are frequently used in this configuration. This article discusses multiple studies showing various attributes' impact on a system's overall efficiency. Most previous reviews did not cover PV with refrigeration cycles. So, this paper surveys the literature on PV-powered cooling cycles. For better classification, PV technologies are categorized into three types: PV, PVT, and CPVT. With this regard, CPVTs still have a way to progress due to a lack of studies compared to PV. The works are divided into three main sections as Exergy Studies, Experimental Studies, and Simulation and Numerical Studies. This review paper categorizes and rates refrigeration-assisted solar systems based on exergy destruction, exergy efficiency, and COP of cooling cycles. The results showed that PV panels have the highest exergy destruction in most of the systems. It is concluded that using PV technologies has a great potential to supply cooling demand, especially in a hot climate condition. Moreover, the study's findings are anticipated to aid designers in scaling up photovoltaic-based cooling systems, resulting in more efficient and sustainable designs.

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“…However, such equipment has the following disadvantages: (i) low COP (coefficient of performance) when compared to vapor compression systems, and (ii) absorption chillers are heavy equipment, and their capital cost is relatively high. Besides the critical points mentioned, the choice of working fluids (refrigerant and absorbent) is crucial for the efficiency and performance of absorption cooling systems, as many authors have demonstrated over the years, by conducting studies in different areas of the cooling thermal comfort or even for refrigeration purposes [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…Usually, the pair LiBr/H 2 O is used for thermal comfort systems and the pair NH 3 /H 2 O for refrigeration systems [12]. As part of the analysis, those equipment have been used for different applications to achieve the energy demands of hospital sector [13], hotel and business buildings [5,6,14,15], refinery industry [16], and also for the configuration of new control strategies on absorption solar systems [17].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

Self Cite

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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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Exergoeconomic Assessment of a Compact Electricity-Cooling Cogeneration Unit

Cited by 13 publications

References 98 publications

Exergoeconomic and Exergoenvironmental Analysis of a Novel Power and Cooling Cogeneration System Based on Organic Rankine Cycle and Ejector Refrigeration Cycle

Exergoeconomic and Exergoenvironmental Analysis of a Novel Power and Cooling Cogeneration System Based on Organic Rankine Cycle and Ejector Refrigeration Cycle

Photovoltaic and Photovoltaic Thermal Technologies for Refrigeration Purposes: An Overview

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

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