Experimental analysis and dynamic simulation of a novel high-temperature solar cooling system

Buonomano, Annamaria; Calise, Francesco; d’Accadia, Massimo Dentice; Ferruzzi, Gabriele; Frascogna, Sabrina; Palombo, Adolfo; Russo, R.; Scarpellino, Marco

doi:10.1016/j.enconman.2015.11.047

Cited by 92 publications

(25 citation statements)

References 27 publications

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“…The main feature of these collectors is their ultra-high vacuum (from 10 −4 to 10 −9 mbar, depending on the operating temperature), which allows one to achieve very high efficiencies up to 200 • C, even higher than the one shown by compound parabolic concentrating solar collectors [18]. This is [50] due to two simultaneous effects: (i) TVP collectors can convert both beam and diffuse radiation; (ii) TVP heat losses are extremely low (due to the ultra-high vacuum). It is also worth noting that such results are achieved without concentration, avoiding the need of any tracking mechanism as well as frequent cleanings.…”

Section: Solar Collectors Modelmentioning

confidence: 97%

“…Such methodology was also used by some of the authors in several previous works (e.g., [47][48][49]), where the model of both built-in and user-developed components are discussed. In particular, the models of the solar collectors was recently presented by some of the authors in reference [50], where an experimental validation was also provided. For the analyzed power plant, a simple single-pressure Combined Cycle (CC) was modelled by the provided types of the STEC TRNSYS library [51].…”

Section: System Modelmentioning

confidence: 99%

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Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Calise

Libertini

Vicidomini

2016

Entropy

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This paper presents a detailed exergetic analysis of a novel high-temperature Solar Assisted Combined Cycle (SACC) power plant. The system includes a solar field consisting of innovative high-temperature flat plate evacuated solar thermal collectors, a double stage LiBr-H 2 O absorption chiller, pumps, heat exchangers, storage tanks, mixers, diverters, controllers and a simple single-pressure Combined Cycle (CC) power plant. Here, a high temperature solar cooling system is coupled with a conventional combined cycle, in order to pre-cool gas turbine inlet air in order to enhance system efficiency and electrical capacity. In this paper, the system is analyzed from an exergetic point of view, on the basis of an energy-economic model presented in a recent work, where the obtained main results show that SACC exhibits a higher electrical production and efficiency with respect to the conventional CC. The system performance is evaluated by a dynamic simulation, where detailed simulation models are implemented for all the components included in the system. In addition, for all the components and for the system as whole, energy and exergy balances are implemented in order to calculate the magnitude of the irreversibilities within the system. In fact, exergy analysis is used in order to assess: exergy destructions and exergetic efficiencies. Such parameters are used in order to evaluate the magnitude of the irreversibilities in the system and to identify the sources of such irreversibilities. Exergetic efficiencies and exergy destructions are dynamically calculated for the 1-year operation of the system. Similarly, exergetic results are also integrated on weekly and yearly bases in order to evaluate the corresponding irreversibilities. The results showed that the components of the Joule cycle (combustor, turbine and compressor) are the major sources of irreversibilities. System overall exergetic efficiency was around 48%. Average weekly solar collector exergetic efficiency ranged from 6.5% to 14.5%, significantly increasing during the summer season. Conversely, absorption chiller exergy efficiency varies from 7.7% to 20.2%, being higher during the winter season. Combustor exergy efficiency is stably close to 68%, whereas the exergy efficiencies of the remaining components are higher than 80%.

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Section: Solar Collectors Modelmentioning

confidence: 97%

Section: System Modelmentioning

confidence: 99%

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Calise

Libertini

Vicidomini

2016

Entropy

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“…The combination of triple-effect chiller and parabolic trough collectors results in the most energy-efficient and cost-effective plant for climatic regions with very high DNI faction [15]. The energy performance of solar double-effect absorption cooling system using EFPC units tested in Saudi Arabia is higher than that of a reference system which was based on concentrating solar thermal collectors [16].…”

Section: Solar Absorption Cooling Systemmentioning

confidence: 98%

Review and recent improvements of solar sorption cooling systems

Bataineh

Taamneh

2016

Energy and Buildings

103

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“…• C under vacuum that could be increased to about 300 • C with further optimization. The importance of vacuum insulation in solar thermal panel has been already highlighted [23], however only recently TVP Solar [24] presented a new High Vacuum insulated Flat plate solar thermal Panel (HVFP) [25]. High vacuum insulation reduces the internal gas convective and conductive losses to a negligible level, keeping high conversion efficiency at high working temperature.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Selective Solar Absorber in High Vacuum Flat Solar Thermal Panels: The Role of Emissivity

Maio¹,

D’Alessandro²,

Caldarelli³

et al. 2020

Preprint

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This study refers to the optimization of a Selective Solar Absorber to improve the Sun-to-thermal conversion efficiency at mid temperatures in high vacuum flat thermal collectors. Efficiency has been evaluated by using analytical formula and a numerical thermal model. Both results have been experimentally validated using a commercial absorber in a custom experimental set-up. The optimization procedure aimed at obtaining Selective Solar Absorber is presented and discussed in the case of a metal dielectric multilayer based on Cr2O3 and Ti. The importance of adopting a real spectral emissivity curve to estimate high thermal efficiency at high temperatures in selective solar absorber is outlined. Optimized absorber multilayers can be 8% more efficient than the commercial alternative at 250 °C operating temperatures and up to 27% more efficient at 300 °C. Once the multilayer has been optimized the choice of a very low emissivity substrate such as copper allows to further improve efficiency and to reach stagnation temperature higher than 400 °C without Sun concentration.

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Experimental analysis and dynamic simulation of a novel high-temperature solar cooling system

Cited by 92 publications

References 27 publications

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Exergetic Analysis of a Novel Solar Cooling System for Combined Cycle Power Plants

Review and recent improvements of solar sorption cooling systems

Efficiency of Selective Solar Absorber in High Vacuum Flat Solar Thermal Panels: The Role of Emissivity

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