Exergy, sustainability and performance analysis of ground source direct evaporative cooling system

Yıldız, Gökhan; Ergün, Alper; Gürel, Ali Etem; Ceylan, İlhan; Ağbulut, Ümit; Eser, Servet; Afzal, Asif; Saleel, C. Ahamed

doi:10.1016/j.csite.2022.101810

Cited by 16 publications

(3 citation statements)

References 30 publications

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“…It is notice from the above figure when the frequency of oscillation decreases the dryer thermal efficiency increases, because at less frequency of oscillation the grains contact more time with hot air losing more amount of moisture to the hot air. The dryer thermal efficiency was less value in morning and evening session and more value at middle of the session at 13 h [1,18,[37][38][39][40][41]. So, the dryer thermal efficiency curve starts from low value in morning and maximum value in middle of the session and then decreases in evening session.…”

Section: Resultsmentioning

confidence: 99%

Investigation of Dual–Pass Inclined Oscillating Bed Solar Dryer for Drying of Non-Parboiled Paddy Grains

Arul¹,

Thulasi²,

Kumar³

et al. 2022

Sustainability

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This Paper determines an experimental study of dual-pass solar dryer with a bed tilt of 0.5° and varying oscillating frequency of drying chamber namely 1.25, 1.75 and 2.25 Hz for drying an agricultural produce namely non–parboiled paddy grains. The oscillations and bed tilt are provided to move the grains from entry to exit of the top bed and moving down to bottom bed and finally exits from the dryer. The new technology has been used in the solar dryer for drying of agricultural produce such as non–parboiled paddy grains to increase the quality and to decrease the loss of the dried produce. The present dryer model was used for drying 45 kg of non–parboiled paddy grains from 19% (w.b) to the approved range of 12–14% of moisture content obtained in a single experimental day. The dried paddy grains obtained an average moisture content are 13.03, 13.22 and 13.51% at the frequency of oscillation of 1.25, 1.75, 2.25 Hz, respectively. The maximum thermal and pick-up efficiency of the model were obtained at 1.00 p.m. in all cases. For the frequency of oscillation of 1.25, 1.75 and 2.25 Hz, the maximum dryer thermal efficiency was 44.47, 43.39 and 41.39%, respectively, and the maximum pick–up efficiency was 80.41, 79.19 and 76.21%, respectively. The optimum drying performance was obtained at the oscillating frequency of 1.75 Hz with the bed tilt of 0.5°.

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Section: Resultsmentioning

confidence: 99%

Investigation of Dual–Pass Inclined Oscillating Bed Solar Dryer for Drying of Non-Parboiled Paddy Grains

Arul¹,

Thulasi²,

Kumar³

et al. 2022

Sustainability

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“…Exergy-based methods have been affirmed capable in the literature of improving performance metrics of energy systems [17][18][19] Specifically, on environmental sustainability, exergetic methods have been applied to assess several types of energy systems such as air conditioning, 20 evaporative cooling plants, 21 gas turbine electricity plants, 22 and aircraft jet designs, 23 etc. Additionally, Maruf et al 24 demonstrated the applicability of the exergetic sustainability method for the assessment of power generation scenarios at a national level using the situation in Bangladesh as a case study.…”

Section: Introductionmentioning

confidence: 99%

Comparative exergetic sustainability analysis of subcritical and supercritical organic Rankine cycle plants for a waste heat recovery application

Oyekale

Okewale

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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This study was aimed at comparing the exergetic sustainability and exergoenvironmental performance of subcritical (SUBORC) and supercritical (SUPERORC) organic Rankine cycle (ORC) plants for waste heat recovery from a marine vessel engine. A liquid-gas shell-and-tube heat exchanger was employed to recover the engine exhaust gases’ thermal energy. The hot exhaust gases flowing through the gas side heat the Therminol 66 heat transfer fluid employed on the liquid side, which in turn heats the ORC working fluid (R600a). Zero-dimensional mass, energy, and exergy balance equations defined by the Laws of Thermodynamics were implemented in MATLAB for the design of the two ORC configurations. Results showed that the evaporator and the preheater are the most sustainable components with exergetic sustainability index (ESI) values of 7.7 and 39.4 for the SUBORC and the SUPERORC, respectively. Additionally, the condenser was obtained in both cases with the worst environmental performance with exergoenvironmental impact of electricity (EIE) values of 12 and 13 eco-indicator points per 1 MW of electricity produced by the SUBORC and the SUPERORC, respectively. Moreover, results showed that a switch from the SUBORC to the SUPERORC would have an insignificant effect on the ESI at the system level; it would reduce the recoverability ratio by about 4%, from about 0.47 in the SUBORC to around 0.45 in the SUPERORC; and it would reduce the EIE by 1.4 Pt/MW. In sum, a supercritical ORC system would exhibit better exergetic environmental sustainability than a subcritical one for waste heat recovery from a marine vessel engine.

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“…Yildiz et al [23] used sustainability and exergy analyses to experimentally examine the performance of an evaporative cooling system under four distinct operating conditions. They reported a decrease in exergy efficiency under positive pressure, but an increase under negative pressure at high air speed.…”

Section: Introductionmentioning

confidence: 99%

Exergy and Exergoeconomic Analyses of Air Conditioning Applications Integrated with an Air Membrane Exchanger

et al. 2022

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The results obtained from the exergoeconomic and exergy analysis of a model of a generic air conditioning (A/C) system without and with an air membrane exchanger using three commercially available refrigerants: R410A, R407C, and R134a, are reported. The model used specialized software that was validated against recently published data and showed good agreement. A/C systems are energy intensive and consume a significant portion of global electricity. Improving their efficiency by even a small amount will produce considerable savings, reduce running costs, and lower pollution emissions. The efficiency of the same A/c system without and with a membrane was investigated for different ambient temperatures, relative humidities (RHs), and pressure ratios of the compressor. It was shown that the inclusion of a membrane improved the efficiency of the system for all three refrigerants tested, particularly at higher ambient temperature. Both the coefficient of performance and exergetic efficiency reduced with the increase in the pressure ratio due to increasing fuel exergy and losses. In all system components except one, it was found that the source of the cost is inefficiencies; hence, increasing the efficiency at the expense of the non-exergy cost will improve the cost effectiveness of the entire system.

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Exergy, sustainability and performance analysis of ground source direct evaporative cooling system

Cited by 16 publications

References 30 publications

Investigation of Dual–Pass Inclined Oscillating Bed Solar Dryer for Drying of Non-Parboiled Paddy Grains

Investigation of Dual–Pass Inclined Oscillating Bed Solar Dryer for Drying of Non-Parboiled Paddy Grains

Comparative exergetic sustainability analysis of subcritical and supercritical organic Rankine cycle plants for a waste heat recovery application

Exergy and Exergoeconomic Analyses of Air Conditioning Applications Integrated with an Air Membrane Exchanger

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