Energy, exergy, environmental and economic comparison of various solar thermal systems using water and Thermia Oil B base fluids, and CuO and Al2O3 nanofluids

Huang, Weibiao; Marefati, Mohammad

doi:10.1016/j.egyr.2020.10.021

Cited by 90 publications

(13 citation statements)

References 78 publications

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“…The mean solar radiation in Dalian is 4.52kWh/m 2 per day. From the literature, 6,13 Dalian can be a region conducive to the use of solar energy. Therefore, the Fresnel performance in Dalian should be examined first.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, T amb and T r are the ambient and receiver mean temperatures, respectively. In Equation (4), Q r denotes absorbed heat by the receiver and is obtained by the following equation 13 :

Q_{r} = A_{LFR} . italicDNI . η_{italicopt - italicLFR}

where, DNI and A LFR refer to direct normal irradiation and Fresnel area, respectively. Finally, the thermal efficiency of the Fresnel is determined as:

η_{LFR} = \frac{\overset{\cdot}{m} . C_{P} . normalΔ T}{A_{a} . italicDNI}

…”

Section: Methodsmentioning

confidence: 99%

“…The concentration ratio range and annual efficiency of the Fresnel are 10 to 40 and 9 to 11%, respectively (slightly lower than the parabolic trough collector). However, the land required for Fresnel for each MWh is lower than the parabolic trough 13 . There are energy systems in the literature that are based on Fresnel thermal energy in various applications.…”

Section: Introductionmentioning

confidence: 99%

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Numerical evaluation of energy system based on Fresnel concentrating solar collector, Stirling engine, and thermoelectric generator with electrical energy storage

et al. 2021

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Summary The purpose of this paper is to present a conceptual study of energy cycle performance consisting of two subsystems of electricity generation and storage. The introduced cycle is based on a linear Fresnel reflector (LFR) technology with a Stirling engine and thermoelectric generator (TG) to generate electricity and pumped‐hydro‐compressed air (PHCA) technology to store energy. Solar energy is converted into thermal energy through parabolic mirrors of the Fresnel and heating the fluid inside the collector. The resulting heat energy provides the required heat duty of the engine. This heat enters the Stirling cycle as input heat, and the mechanical energy convert into electricity. In addition, TG is thermally connected to the engine exhaust to generate additional electric energy. Then, the energy produced from the power generation subsystem is stored by the energy storage subsystem. Although many works had been done on the integrating of various solar thermal collectors and intermediate and/or downstream cycles, efforts had not been created to develop research on the combination of LFR, Stirling engine, TG, and PHCA system. Results showed that the power generation subsystem could generate 1.46 kW of electricity. The share of Stirling engine and TG in electricity generation was 72.6% and 27.4%, respectively. In addition, the power generation and energy storage efficiencies were 39.52% and 63.75%, respectively. Two different cases are offered for the design of the Fresnel solar field based on the useful power obtained.

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Section: Resultsmentioning

confidence: 99%

Q_{r} = A_{LFR} . italicDNI . η_{italicopt - italicLFR}

where, DNI and A LFR refer to direct normal irradiation and Fresnel area, respectively. Finally, the thermal efficiency of the Fresnel is determined as:

η_{LFR} = \frac{\overset{\cdot}{m} . C_{P} . normalΔ T}{A_{a} . italicDNI}

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical evaluation of energy system based on Fresnel concentrating solar collector, Stirling engine, and thermoelectric generator with electrical energy storage

et al. 2021

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“…CSPs convert solar energy into heat by focusing sunlight with lenses on a small area 13 . It has been reported that CSPs can supply up to 25% of the world's power demand in 2050 14 . PDC is the well‐known and widely researched CSP technology and operates at 100°C to 1500°C, as well as is suitable to high‐temperature thermal applications 15 .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of a new combined energy system includes parabolic dish solar collector, Stirling engine and thermoelectric device

et al. 2021

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Summary According to new findings, the use of clean energy sources such as solar energy to supply energy (both electricity and heat) to human societies is essential. On the other hand, choosing the appropriate technology to convert solar energy into useful energy in the form of individual or combined systems is a fundamental issue. Individual solar energy systems have inherently low performance. However, their use in hybrid energy systems with other energy generation devices is key solution and shows high performance. The present work provides the performance of a new combined energy system composed of the parabolic dish solar collector (PDC), Stirling engine (SE) and thermoelectric device (TD) under various parameters. Sun is the main source of energy in this system, where, sunlight is focused on the PDC focal point by the parabolic shaped mirrors. Thus, the useful thermal power is produced by PDC and then feeds to the SE. The operating fluid of the engine is heated by this heat and converted into mechanical energy. Then, the mechanical energy is converted into electricity by a generator connected to the SE and the excess heat is lost from the engine. The exhaust of the SE transferred to the TEG hot end and produces further electricity. In addition, the TEC module absorbs the cooled environment heat and produces cooling energy (by consuming electricity from the TEG). Therefore, the proposed combined process provides the electricity, heat and cooling. The paper is based on the following three scenarios: (1) the system performance is evaluated under constant climatic conditions, (2) climate data from five various cities in Europe and Asia are used for system operation and (3) this scenario presents the general comparison between the two different hybrid energy systems driven by PDC and linear Fresnel reflector (LFR). In addition, multi‐objective optimization is provided to obtain the optimal performance of the developed hybrid system. The optimization results showed that, the optimum total output electricity and overall efficiency were 26.21 kW and 39.17%, respectively. It was also found that, average daily useful power generated by PDC in Moscow on 14‐June is 373.97 W/m2, which is about 11.1%, 1.55%, 33.3% and 14.23% more than Tehran, Beijing, Geneva and Kiev, respectively. Furthermore, increasing the temperature of PDC absorber improves the performance of SE and TD and subsequently improves the overall operation. Also, in terms of the PDC numbers, the system in the cities of Tehran, Beijing and Moscow has a better justification compared to the other two cities (Geneva and Kiev).

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“…The efficiency of the solar collector was claimed to be higher with the use of nanofluids than the acetone only and it increases with the increase of volume concentration from 0.25 to 0.5%. Huang and Marefati (2020) have been investigated the influence of Al2O3 and CuO nanoparticles on the efficiency of different types of solar collectors (that are the flat-plate and parabolic trough, parabolic dish collector, and linear Fresnel solar reflector) in two different basefluid i.e. water and Thermia Oil B.…”

Section: Introductionmentioning

confidence: 99%

A novel design for solar collector used for water heating application having nanofluid as working medium: CFD modeling and simulation

Kumar

Kharub²,

Sharma

et al. 2022

Environ Sci Pollut Res

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A solar collector is a simple and cheap device that is capable of collecting and converting solar radiation into useful heat energy. The thermal performance of the solar collectors can be enhanced significantly with the suspension of nanoparticles in the base fluid. A novel design for a solarassisted water heater (SWH) is proposed in the current study and the effect of nanofluid has been investigated on the thermal efficiency of the SWH. The use of nanofluid is one of the prominent methods in comparison to other techniques for improving the performance of solar collectors and therefore, the base working fluid i.e. water is mixed with the alumina nanoparticles of average particle size of 30 nm, and they are assumed to be spherical. The flow and thermal characteristics of nanofluid through the solar water heater are simulated numerically with the help of the Eulerian-Eulerian two-phase model using the finite volume method (FVM). The commercial package i.e. ANSYS Fluent is used for modeling the problem under transient conditions with a pressure-based solver. In comparison to a conventional flat plate collector, the proposed solar water heater consists corrugated absorber-plate and the effect of radius of curvature of corrugation has been investigated on the heat transfer and collector efficiency. With the proposed design the heat transfer area available with the riser tubes increases remarkably and it leads to a 43% and 14% increase in heat transfer augmentation and collector efficiency, in comparison to the conventional solar water heater.

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Energy, exergy, environmental and economic comparison of various solar thermal systems using water and Thermia Oil B base fluids, and CuO and Al2O3 nanofluids

Cited by 90 publications

References 78 publications

Numerical evaluation of energy system based on Fresnel concentrating solar collector, Stirling engine, and thermoelectric generator with electrical energy storage

Numerical evaluation of energy system based on Fresnel concentrating solar collector, Stirling engine, and thermoelectric generator with electrical energy storage

Numerical investigation of a new combined energy system includes parabolic dish solar collector, Stirling engine and thermoelectric device

A novel design for solar collector used for water heating application having nanofluid as working medium: CFD modeling and simulation

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