Performance analyses of coal-fired thermal power plant using parabolic solar collectors for feed water heaters

Geete, Ankur

doi:10.1080/14484846.2019.1706226

Cited by 13 publications

(8 citation statements)

References 33 publications

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“…The first law of thermodynamics for a process introduced a property of the thermodynamic system, which is called internal energy, and the second law of thermodynamics also introduced another important property, that is, the entropy of the system. In the actual process, entropy is generated due to irreversibilities and it has been observed that the rate of change of entropy is more than the ideal/reversible process 28,56 . When a thermodynamic system achieves thermodynamic equilibrium condition with the surroundings (i.e., pressure P a , temperature T a ) then maximum work can be transferred through the system 57 .…”

Section: Methodsmentioning

confidence: 99%

“…Finally, exergy efficiencies of the solar drying system have been determined through Equation (18) or (19) at different conditions. Exergy efficiency is the ratio of the rate of exergy at outlet to the rate of exergy at inlet 28,30

Exergy efficiency of the system; η_{Ψ} = 1 - (Ψ_{des} / Ψ_{in}),

or exergy efficiency of the system; η_{Ψ} = (Ψ_{out} / Ψ_{in}) .

…”

Section: Methodsmentioning

confidence: 99%

“…Youcef‐Ali et al 27 determined the average coefficient of internal moisture transfer for the drying of potato slices. Exergy analyses have been done on different solar systems: parabolic solar collector, compound parabolic solar collector, evacuated tube, single‐ and double‐solar still by researchers 28–34 . Mugi and Chandramohan 35 calculated the rates of inlet/outlet exergy, exergy losses, and exergy efficiencies of indirect solar dryer systems at free and forced convection techniques with 3.69 and 5.1 sustainability indexes, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Energy and exergy analyses of fabricated solar drying system with smooth and rough surfaces at different conditions: A case study

Geete

Singh

Rathore³

2021

Heat Trans

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For this experimental work, the solar dryer system has been fabricated. Various experiments have been performed to evaluate the performance of the fabricated dryer system. Energy and exergy concepts have been used for the assessment. And comparative analyses have also been done with smooth and rough surfaces: Grade 150 and Grade 300. This experimental work has been concluded as the maximum collector (i.e., 74°C) and cabinet temperatures (i.e., 66°C) are attained at 13:00 p.m. with Grade 300 surface. Maximum moisture loss (i.e., 35 g) and percentage moisture loss (i.e., 7.53%) are recorded at 13:00 p.m. again with a rough surface. Minimum exergy destruction rate (i.e., 0.294 W) but minimum exergy efficiency (i.e., 20.82%) are found at 17:00 p.m. with a black painted surface, which is not an acceptable condition. Maximum energy efficiency (i.e., 35.98%) and heat removal factor (i.e., 0.56) are obtained at 13:00 p.m. with a rough surface. The best performance from the fabricated solar system is received between 12:00 and 14:00 p.m. This study recommends rough surfaces and 12:00–13:00 p.m. timings for the solar drying system as the performance of the system is better in terms of energy–exergy.

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Section: Methodsmentioning

confidence: 99%

Exergy efficiency of the system; η_{Ψ} = 1 - (Ψ_{des} / Ψ_{in}),

or exergy efficiency of the system; η_{Ψ} = (Ψ_{out} / Ψ_{in}) .

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy and exergy analyses of fabricated solar drying system with smooth and rough surfaces at different conditions: A case study

Geete

Singh

Rathore³

2021

Heat Trans

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“…where Ψ in and Ψ out are the rates of exergy at inlet and outlet for single and double slope solar stills in Watt, T 0, T w and T s are the ambient, water and Sun's surface temperatures. Surface temperature of the Sun has been taken as 5800 K [34][35][36][37]43].…”

Section: Methodsmentioning

confidence: 99%

Comparative exergy and exergy efficiency analyses of fabricated single and double slope solar still plants at Indore: case study

et al. 2020

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In this research project two solar still plants have been fabricated; single and double slope still plants. The exergy and exergy efficiency concepts have been applied for the comparative analyses of both solar stills. Experimental readings, i.e. various temperatures, amounts of distilled water and solar radiations have been taken for solar stills at different time intervals in Indore (22° 43′ 4.51″ N and 75° 49′ 59.88″ E). The percentage variations in the different parameters, i.e. increments in temperature, increments in quantity of water, thermal efficiencies, rates of exergy at inlet/outlet and exergy efficiencies have also been calculated for stills at various solar intensities and time intervals. After experimental and comparative analyses, better outputs have been shown at 14:50 PM for double slope and 14:45 PM for single slope plant due to the cumulative effects of solar radiations on the still plants. During this period thermal/exergy efficiencies, i.e. 46.630/1.949% and 47.259/3.389% were found the best. The performance of single slope solar still has been found better, and 14:30 to 14:50 PM time interval has been recorded superior for the distillation of water through still plants where percentage increments of the performance evaluating parameters were enhanced. Keywords Single and double slope solar stills • Thermal efficiency • Rates of inlet and outlet exergy • Exergy efficiency • Solar radiation List of symbols C Specific heat of water (J/kg K) dT w Temperature difference which was achieved due to solar energy (K) I b R B Solar radiation which is available for single and double slope solar still (W/m 2) L Length of the solar still (m) m Mass flow rate of pure water (kg/s) T 0, T w and T s Ambient, water and Sun's surface temperatures (K) W Width of the solar still (m) Greek symbols η Thermal efficiency of the solar still (%) α g , ρ g and τ g Absorptivity, reflectivity and transmissivity of the glass Ψ in and Ψ out Exergy at inlet and outlet for single and double slope solar still (W)

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“…As discussed in the introduction section, entransy is a novel term that has been used in modern times to analyze the performance of HExs, and entransy can be understood as the ability of heat transfer from a heat exchanging device 25,34‐36 . For CFHEx, rates of entransy have been analyzed as 29

G_{e n t r a n s y} = ½ U T,

G_{d i s s i p a t i o n} = ½ false[m_{h f} C_{p h f} false{{(T_{h f i n})}^{2} - {(T_{h f o u t})}^{2} false} false] - ½ false[m_{c f} C_{p c f} false{{(T_{c f o u t})}^{2} - {(T_{c f i n})}^{2} false} false],

…”

Section: Methodsmentioning

confidence: 99%

Experimental exergy and entransy analyses on designed and fabricated crossflow heat exchanger

et al. 2020

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A crossflow heat exchanger (CFHEx) is designed and fabricated in a workshop. For designing this heat exchanger (HEx), the number of passes, frontal areas, HEx volumes, heat transfer areas, free‐flow areas, ratios of minimum free‐flow area to frontal area, densities, mass flow rates of flowing fluids, maximum/minimum heat capacities, heat capacity ratio, outlet temperatures of hot/cold fluids, average temperatures, mass velocities, Reynolds numbers, and convective heat transfer coefficients are evaluated by considering Colburn/friction factors. After fabrication of the HEx, effectiveness, exergy destruction, entransy dissipation, entransy dissipation‐based thermal resistance, entransy dissipation number, and entransy effectiveness for hot/cold fluids sides are found at different flow rates and inlet temperatures of fluids. By experimental results, optimum operating conditions are found, which gives maximum effectiveness and entransy effectiveness but minimum rates of exergy destruction, entransy dissipation, entransy dissipation‐based thermal resistance, and entransy dissipation number for the fabricated CFHEx. This study is concluded as follows: minimum exergy destruction and entransy dissipation rates (ie, 3.061 kJ/s·K and 1125.44 kJ·K/s, respectively) are found during experiment 2. Maximum entransy effectiveness of hot/cold fluids (ie, 0.689/0.21) is achieved in experiment 1. Moderate values of entransy dissipation number (ie, 4.689), entransy dissipation‐based thermal resistance (ie, 0.04 s·K/J), exergy destruction (ie, 3.845 kJ/s·K), and entransy dissipation (ie, 1374.04 kJ·K/s) rates are found during experiment 1. Maximum effectiveness (ie, 0.4) for the fabricated HEx is also obtained through experiment 1. After comparative analyses, it is found that experiment 1 provides optimum results, which shows the best performance of the fabricated HEx.

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Performance analyses of coal-fired thermal power plant using parabolic solar collectors for feed water heaters

Cited by 13 publications

References 33 publications

Energy and exergy analyses of fabricated solar drying system with smooth and rough surfaces at different conditions: A case study

Energy and exergy analyses of fabricated solar drying system with smooth and rough surfaces at different conditions: A case study

Comparative exergy and exergy efficiency analyses of fabricated single and double slope solar still plants at Indore: case study

Experimental exergy and entransy analyses on designed and fabricated crossflow heat exchanger

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