Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Bellos, Evangelos; Tzivanidis, Christos

doi:10.1002/er.4689

Cited by 8 publications

(4 citation statements)

References 36 publications

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“…It is obvious that higher mass flow rates lead to higher thermal efficiency; however, after a certain value of mass flow rate for liquid HTFs, efficiency curves become horizontal and does not change. This fact proves that there is no reason for using higher mass flow rates by thermal/energetic point of view 40 . The same trend can be observed for sCO 2 but it happens at higher mass flow rate as compared to other two fluids.…”

Section: Resultssupporting

confidence: 74%

“…This fact proves that there is no reason for using higher mass flow rates by thermal/ energetic point of view. 40 The same trend can be observed for sCO 2 but it happens at higher mass flow rate as compared to other two fluids. All the investigated performance parameters increase rapidly against mass flow rate of 0.04 kg/s, but after that, less increment is observed for all the considered performance parameters.…”

Section: Exergo-environmental Analysissupporting

confidence: 71%

“…Results showed that high portion of new energy access‐CCHP was more eco‐friendly and economical as compared to the conventional CCHP system. Furthermore, the researchers 38-40 have investigated the performance of various solar integrated multigenerational systems that were more efficient and environment‐friendly as compared to conventional stand‐alone systems.…”

Section: Introductionmentioning

confidence: 99%

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Thermo‐environmental investigation of solar parabolic dish‐assisted multi‐generation plant using different working fluids

et al. 2020

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The present study investigates the performance of a multi-generation plant by integrating a parabolic dish solar collector to a steam turbine and absorption chiller producing electricity and process heat and cooling. Thermodynamic modeling of the proposed solar dish integrated multi-generation plant is conducted using engineering equation solver to investigate the effect of certain operating parameters on the performance of the integrated system. The performance of the solar integrated plant is evaluated and compared using three different heat transfer fluids, namely, supercritical carbon dioxide, pressurized water, and Therminol-VPI. The useful heat gain by collector is utilized to drive a Rankine cycle to evaluate the network output, rate of process heat, cooling capacity, overall energetic, and exergetic efficiencies as well as coefficient of performance. The results show that water is an efficient working fluid up to a temperature of 550 K, while Therminol-VPI performs better at elevated temperatures (630 K and above). Higher integrated efficiencies are linked with the lower inlet temperature and higher mass flow rates. The integrated system using pressurized water as a heat transfer fluid is capable of producing 1278 and 832 kW of power output and process heat, respectively, from input source of almost 6121 kW indicating overall energy and exergy efficiencies of 34.5% and 37.10%, respectively. Furthermore, multi-generation plant is evaluated to assess the exergy destruction rate and steam boiler is witnessed to have the major contribution of this loss followed by the turbine. The exergo-environmental analysis is carried out to evaluate the impact of the system on its surroundings. Exergo-environmental impact index, impact factor, impact coefficient, and impact improvement are evaluated against increase in the inlet temperature of the collector. The single-effect absorption cycle is observed to have the energetic and exergetic coefficient of performances of 0.86 and 0.422, for sCO 2 operating system, respectively, with a cooling load of 228 kW.

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Section: Resultssupporting

confidence: 74%

Section: Exergo-environmental Analysissupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Thermo‐environmental investigation of solar parabolic dish‐assisted multi‐generation plant using different working fluids

et al. 2020

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“…Both the FPSC and the ETSC can provide a sufficient amount of heated water used in the organic Rankine cycle. Bellos and Tzivanidis 146 investigated a numerically novel solar‐driven cogeneration system and found that the FPSC selection size was significantly smaller than the ETSC in optimal exergetic scenarios. However, in cases of higher demand for heating output, the FPSC region is declining.…”

Section: Energy Efficiency Of Forced Circulation Etscmentioning

confidence: 99%

Energy and exergy analysis for stationary solar collectors using nanofluids: A review

Eltaweel

Abdel‐Rehim

2020

Int J Energy Res

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Summary Fossil fuels demonstrate pollution effects and significant emissions on the atmosphere, which made the use of clean, renewable sources of energy a necessity. Renewable energy has many sources, but the most promising and cheapest energy source is solar energy, which has led to a focus on efficient solar energy harvesting to be cheaper for public use. Stationary solar collectors like evacuated tube and flat‐plate solar collectors are the most commonly used solar collectors for their simplicity of installation and maintenance. They are mostly used for domestic applications such as solar water heaters. Nanofluids can improve the thermal properties of the working fluid which can improve the performance of a collector. This review paper discussed the effect of different parameters on the stationary solar collector's performance, such as nanoparticle use, nanoparticle size, concentration, and the base fluid of the nanofluid. This review paper also aims to summarize previous studies performed on the use of different nanofluids on the two types of circulation that can be either thermosiphon or forced circulation for both collectors to investigate the energetic and exergetic efficiencies. The theoretical performance analysis equations of stationary solar collectors are provided too. From the reviewed results, it was concluded that a substantial improvement in both the energetic and exergetic efficiencies of both collectors had been obtained from the use of carbon‐based nanofluids compared to a significant number of different nanofluids. The paper also discusses the significant challenges of nanofluid use and how to overcome them in stationary solar collectors.

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The theoretical approach of the solar organic Rankine cycle integrated with phase change material for the Hungarian region

Permana,

Rusirawan,

Farkas

2023

Energy Science & Engineering

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Hungary is not only dependent on imports of natural gas and fossil fuels, but Hungary is also the lowest in renewable energy utilization; otherwise, only 11.3% compared to other Central European countries in renewable energy utilization, above 13%. The percentage of renewables in power generation quadrupled from 8% to 16% between 2010 and 2020, with most of the gains coming from the rapid expansion of solar energy, particularly after 2016. Regarding solar energy resource potential, Hungary has a daily total of around 3.2–3.6 kWh/m2 and a yearly total of about 1168–1314 kW.h/m2. This makes it a suitable location for putting solar thermal collectors in conjunction with an organic Rankine cycle (ORC) system. In this study, the authors analyzed solar thermal as a heat source to generate electricity with ORC using two types of working fluids (R245fa and R123). Hungary's weather data for a whole year is used as primary data to look for solar radiation characteristics and ambient temperature. Based on the general solar collector equation, the parabolic tube collector was selected as the best solar collector to utilize solar radiation by producing a maximum heat of around 654.68 kW. Therefore, the evacuated flat plate collector was selected as the solar collector that can produce the maximum outlet temperature of around 372.15 K with a similar size aperture area. Producing a temperature output from the solar collector for heat transfer in the ORC system and from the performance showed that R245fa resulted in better Wnet performance compared with R123 with values of 45.82 and 28.17 kW, respectively, under the same solar collector. Meanwhile, the material suitable for the thermal energy storage‐evaporator combination is organic phase change material using N‐Octacosane, which in the same temperature range (350–375 K) has the smallest ζ(T) value (1.08–1.103), so the mass required for the system is very efficient.

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Design of a solar‐driven cogeneration system using flat plate collectors and evacuated tube collectors

Cited by 8 publications

References 36 publications

Thermo‐environmental investigation of solar parabolic dish‐assisted multi‐generation plant using different working fluids

Thermo‐environmental investigation of solar parabolic dish‐assisted multi‐generation plant using different working fluids

Energy and exergy analysis for stationary solar collectors using nanofluids: A review

The theoretical approach of the solar organic Rankine cycle integrated with phase change material for the Hungarian region

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