Exergy analysis of parabolic trough solar receiver

Padilla, Ricardo Vásquez; Fontalvo, Armando; Demirkaya, Gökmen; Martínez, Arnold; Gonzalez‐Quiroga, Arturo

doi:10.1016/j.applthermaleng.2014.03.053

Cited by 113 publications

(34 citation statements)

References 18 publications

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“…In combination of exergy reduction due to the two mentioned factors, we obtain the gradual change in exergy with a maximum value at a certain point. Similar result for thermal and exergy efficiency was reported for solar collectors [9,10,14,26]. efficiency is shown in the following figures (Figures 4-8).…”

Section: Resultssupporting

confidence: 72%

“…The temperature difference between absorber plate and the heat transfer fluid contribute to very low portion of exergy destruction. The graph pattern is in good agreement for the curve for the parabolic trough receiver [26]. Figure 11 shows that the exergy loss due to optical loss reduces with the increasing optical efficiency.…”

Section: Resultssupporting

confidence: 68%

“…The values of parameters at optimum condition are then used for examining the effect of a certain parameter on the system performance. A summary of exergy destruction and loss [14,25], dimensionless exergy [26] and exergy destruction ratio [27] is provided here, which can be used for predicting the performance of this type of systems.…”

Section: Introductionmentioning

confidence: 99%

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Exergy Analysis of Serpentine Thermosyphon Solar Water Heater

et al. 2018

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Abstract:The performance of a solar hot water system is assessed for heat pump and domestic heating applications. Thermodynamic analysis on a serpentine-type thermosyphon flat-plate solar heater is conducted using the Second Law of thermodynamics. Exergetic optimization is first performed to determine the parameters for the maximum exergy efficiency using MATLAB optimization toolbox. Geometric parameters (collector surface area, dimensions, and pipe diameter), optical parameters (transmittance absorptance product), ambient temperature, solar irradiation and operating parameters (mass flow rate, fluid temperature, and overall heat transfer (loss) coefficient) are accounted for in the optimization scheme. The exergy efficiency at optimum condition is found to be 3.72%. The results are validated using experimental data and found to be in good agreement. The analysis is further extended to the influence of various operating parameters on the exergetic efficiency. It is observed that optical and thermal exergy losses contribute almost 20%, whereas approximately 77% exergy destruction is contributed by the thermal energy conversion. Exergy destruction due to pressure drop is found negligible. The result of this analysis can be used for designing and optimization of domestic heat pump system and hot water application.

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Section: Resultssupporting

confidence: 72%

Section: Resultssupporting

confidence: 68%

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Exergy Analysis of Serpentine Thermosyphon Solar Water Heater

et al. 2018

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“…Energy selling prices in the range 0.2-0.3 USD/kWh are not competitive compared to the average price of electricity for industrial users in the United States, which is between 0.05 and 0.2 USD/kWh, but are close to the average price of electricity for residential users, which is between 0.1 and 0.3 USD/kWh [49]. Nevertheless, in non interconnected areas, the electricity cost of new rooftop Solar Photovolaic (PV) systems ranges between 0.1 and 0.4 USD/kWh [50] and the cost of electricity in Concentrated Solar Power (CSP) via parabolic trough collectors, which is the most common and mature solar thermal power technology [51], is between 0.17 and 0.35 USD/kWh [52], showing that simple ORC with a selling price of energy of 0.3 USD/kWh could be a feasible option, depending on the profitability input parameters and taxes. …”

Section: Net Present Value (Npv)mentioning

confidence: 99%

Energy, Exergy and Economic Evaluation Comparison of Small-Scale Single and Dual Pressure Organic Rankine Cycles Integrated with Low-Grade Heat Sources

Fontalvo

Solano

Pedraza

et al. 2017

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Low-grade heat sources such as solar thermal, geothermal, exhaust gases and industrial waste heat are suitable alternatives for power generation which can be exploited by means of small-scale Organic Rankine Cycle (ORC). This paper combines thermodynamic optimization and economic analysis to assess the performance of single and dual pressure ORC operating with different organic fluids and targeting small-scale applications. Maximum power output is lower than 45 KW while the temperature of the heat source varies in the range 100-200°C. The studied working fluids, namely R1234yf, R1234ze(E) and R1234ze(Z), are selected based on environmental, safety and thermal performance criteria. Levelized Cost of Electricity (LCOE) and Specific Investment Cost (SIC) for two operation conditions are presented: maximum power output and maximum thermal efficiency. Results showed that R1234ze(Z) achieves the highest net power output (up to 44 kW) when net power output is optimized. Regenerative ORC achieves the highest performance when thermal efficiency is optimized (up to 18%). Simple ORC is the most cost-effective among the studied cycle configurations, requiring a selling price of energy of 0.3 USD/kWh to obtain a payback period of 8 years. According to SIC results, the working fluid R1234ze(Z) exhibits great potential for simple ORC when compared to conventional R245fa.

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“…Their result shows that the exergy output, d.k.gupta6873@gmail.com, dr.rajeshmits@gmail.com, naveenkumardce@gmail.com ) exergetic and thermal efficiencies are enhanced as the solar intensity increases. Reference [3] presented an exergy analysis of parabolic trough solar receiver. Their result shows that inlet temperature of heat transfer fluid and solar irradiance has significant effect on the thermal and exergetic performance of the PTC.…”

Section: Introductionmentioning

confidence: 99%