Thermoeconomic and environmental analysis of solar flat plate and evacuated tube collectors in cold climatic conditions

Sokhansefat, Tahmineh; Kasaeian, Alibakhsh; Rahmani, K.; Heidari, Ameneh Haji; Aghakhani, F.; Mahian, Omid

doi:10.1016/j.renene.2017.08.057

Cited by 122 publications

(31 citation statements)

References 17 publications

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“…The costs of PTCs and ETCs, based on the specifications considered in this study, are in the range of 45‐55 EUR/MWh 21 and 20‐30 EUR/MWh(calculated based on the cost, characteristics and performance reported in Ref. 22), respectively. The standard electricity production price is usually taken as 30 EUR/MWh 23 …”

Section: Resultsmentioning

confidence: 99%

Energy performance enhancement of solar thermal power plants by solar parabolic trough collectors and evacuated tube collectors ‐based preheating units

Alsagri

2020

Int J Energy Res

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Summary Solar steam power plant is the dominant technology in the category of solar thermal power systems. In steam power cycles, there is usually a couple of steam lines, extracted from medium‐pressure and low‐pressure turbines, to preheat the working fluid before the boiler. This although leads to an increase in the energy efficiency of the cycle, reduces the contribution of the turbine proportionally. Therefore, finding an alternative method of preheating the working fluid would be effective in further enhancement of the efficiency of the system. In this study, the feasibility of using solar collectors for the preheating process in a solar steam power plant is investigated. For this, parabolic trough solar collectors and evacuated tube solar collectors based on a wide range of different scenarios and configurations are employed. The plant is designed, sized and thermodynamically analyzed for a case study in Saudi Arabia where there is a large solar irradiation potential over the year. The results of the simulations show that, among all the considered scenarios, a power cycle aided by a set of parabolic trough collectors as the preheating unit is the best choice technically. This configuration leads to about 23% increased power generation rate and 6.5% efficiency enhancement compared to the conventional design of the plant.

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Section: Resultsmentioning

confidence: 99%

Energy performance enhancement of solar thermal power plants by solar parabolic trough collectors and evacuated tube collectors ‐based preheating units

Alsagri

2020

Int J Energy Res

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“…For solar domestic systems, flat plate collectors (FPCs) and evacuated tube collectors (ETCs) are most commonly used. From these two types, FPCs are more often chosen due to a simple design, low price, and the ability to produce heat up to 100 • C [27]. On the other hand, ETCs are more efficient collectors, but they are also more expensive than FPCs.…”

Section: Introductionmentioning

confidence: 99%

“…Basic parameters of the FPC in the installation in Brzesko and the evacuated tube collector (ETC) in the installation in Krosno. Source: own study based on References[27,[44][45][46].…”

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confidence: 99%

The Comparison of Solar Energy Gaining Effectiveness between Flat Plate Collectors and Evacuated Tube Collectors with Heat Pipe: Case Study

2020

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In Poland, various solar collector systems are used; among them, the most popular are flat plate collectors (FPCs) and evacuated tube collectors (ETCs). The work presents two installations located at a distance of 80 km apart, working in similar external conditions. One of them contains 120 flat plate collectors and works for the preparation of hot water in a swimming pool building; the second one consists of 32 evacuated tube collectors with a heat pipe and supports the preparation of domestic hot water for a multi-family house. During the comparison of the two quite large solar installations, it was confirmed that the use of evacuated tube solar collectors shows a much better solar energy productivity than flat plate collectors for the absorber area. Higher heat solar gains (by 7.9%) were also observed in the case of the gross collector area. The advantages of evacuated tube collectors are observed mainly during colder periods, which allows for a steadier thermal energy production.

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“…The observed findings suggest that ETC based SWH has higher efficiency over wide operating conditions with limited heat losses. Sokhansefata et al [9] reported a thermo-economic analysis performed on a flat-plate and an ETC based SWH system. The TRNSYS-16 software predicted the annual collector energy output and the outlet temperature.…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics analysis on solar water heater: Role of thermal stratification and mixing on dynamic mode of operation

Dileep

Raj²,

Dishnu³

et al. 2020

Therm sci

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The present work attempts to demonstrate the competence and reliability of the proposed computational solver for real-scale modelling and analysis of a commercially available evacuated tube collector type solar water heater. A 3-D, transient numerical solver with user-defined functions is modelled using CFD program ANSYS-Fluent 15.0 ® . The objective is to analyse the evacuated tube collector type solar water heater in two states of operation, namely, static (stagnant charging) and dynamic (retrieval) modes. This work emphasizes the determination of the impact of thermal stratification, and fluid mixing in the storage tank on the outlet temperature profile during discharging. Volume flow rates vary from 3-15 Lpm. The reported findings suggest that with an increase of fluid-flow during discharge, the stratified layers disorient and lead to rapid mixing, which eventually results in an earlier drop in the outlet water temperature. Furthermore, at low fluid-flow rates, the stratified layers remain intact with only a gradual decay in the outlet temperature profile. The analysis reveals that based on the user's choice, it is possible to vary discharge flow rate until 7 Lpm without a significant drop in the outlet water temperature. Furthermore, computational results have been successfully validated with experimental findings.

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Thermoeconomic and environmental analysis of solar flat plate and evacuated tube collectors in cold climatic conditions

Cited by 122 publications

References 17 publications

Energy performance enhancement of solar thermal power plants by solar parabolic trough collectors and evacuated tube collectors ‐based preheating units

Energy performance enhancement of solar thermal power plants by solar parabolic trough collectors and evacuated tube collectors ‐based preheating units

The Comparison of Solar Energy Gaining Effectiveness between Flat Plate Collectors and Evacuated Tube Collectors with Heat Pipe: Case Study

Computational fluid dynamics analysis on solar water heater: Role of thermal stratification and mixing on dynamic mode of operation

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