Exergy analysis of heat transfer in a turbulent pipe flow by a decaying swirl generator

Bali, Tülin; Saraç, Betül

doi:10.1504/ijex.2008.016013

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…To evaluate the augmentation of the heat transfer coefficient compared to the exergy destruction increment, a parameter named "Effectiveness number" (En) is described through Eq. ( 19) [36]:…”

Section: Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Entropy generation and exergy destruction in two types of wavy microchannels working with various aqueous nanofluids using a multi-phase mixture model

Jamshidmofid

Olfati²,

Arabkoohsar³

et al. 2023

J Therm Anal Calorim

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Section: Parametersmentioning

confidence: 99%

“…In the above relation, Ẋout, Ẋin and Ẋheat are respectively the input exergy due to the fluid entrance to the heat sink, output exergy due to the exit of the fluid from the heat sink, and input exergy due to the heat flux applied to the bottom surface. The equation for each parameter is as below [36]:…”

Section: Parametersmentioning

confidence: 99%

Entropy generation and exergy destruction in two types of wavy microchannels working with various aqueous nanofluids using a multi-phase mixture model

Jamshidmofid

Olfati²,

Arabkoohsar³

et al. 2023

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…Therefore, the difference between input and the output values gives us the losses in pipes. Similarly, the exergy destruction is the difference between exergies at these two points [ 33 ]. The input energy and exergy are expressed as [ 34 ]:

…”

Section: Mathematical Analysismentioning

confidence: 99%

Cascaded Thermodynamic and Environmental Analyses of Energy Generation Modalities of a High-Performance Building Based on Real-Time Measurements

Doury

Ozkan

Mengüç

2020

Entropy

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This study presents cascaded thermodynamic and environmental analyses of a high-performance academic building. Five different energy efficiency measures and operation scenarios are evaluated based on the actual measurements starting from the initial design concept. The study is to emphasize that by performing dynamical energy, exergy, exergoeconomic, and environmental analyses with increasing complexity, a better picture of building performance indicators can be obtained for both the building owners and users, helping them to decide on different investment strategies. As the first improvement, the original design is modified by the addition of a ground-air heat exchanger for pre-conditioning the incoming air to heat the ground floors. The installation of roof-top PV panels to use solar energy is considered as the third case, and the use of a trigeneration system as an energy source instead of traditional boiler systems is considered as the fourth case. The last case is the integration of all these three alternative energy modalities for the building. It is determined that the use of a trigeneration system provides a better outcome than the other scenarios for decreased energy demand, for cost reduction, and for the improved exergy efficiency and sustainability index values relative to the original baseline design scenario. Yet, an integrated approach combining all these energy generation modalities provide the best return of investment.

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“…Jafari [12] has designed a swirling flow generator consisting of four holes as a star cross-section in a disk with several disks inserted along the axial direction of the tube to investigate their effects on the overall heat exchanger performance. The effects of the number of vanes in a propeller and its axial positions, besides the vane inclination angle with a vertical axis of the turbulence device technique in swirl generation, have been studied too [13]. Improved numerical shell and tube heat exchanger hydrodynamic characteristics resulted by using baffle type vortex generators [14].…”

Section: Introductionmentioning

confidence: 99%

Thermo-hydraulic performance evaluation of heat exchanger tube with vortex generator inserts

2022

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This work is undertaken as a scientific experiment to test a new design of a turbulent generator. The current research experiments the influence of novel vortex generator (VG )inserts on heat transfers within a tube under a uniform heat flux. A copper tube with a 45 mm inner diameter and 1,350 mm length is used along with a solid disc injector (swirl generator) that comprises ten crescent holes with equal circumferential distribution angles around the disk canter. Subsequently, a swirl flow is generated by deviating the stream flow 45 degrees causing it to spin in the direction of the axial flow. Flow directors are on 45? angles toward the axial direction for each of the crescent holes. This study is an example of flow degradation. Reynolds numbers (Re). range from 6000 to 13500. Therefore, fluid flow is treated as a turbulent system. All experiments done with air are regarded as a power fluid; the Prandtl number is fixed at about 0.71. Thermo-hydraulic performance of heat exchanger is analyzed. The average heat transfer Nusselt number is calculated and discussed. The experiment found out that Nusselt number (Nu) increases with an increase in Re. as well as the number of swirl generators. At four vortex generators (VGs), the maximum augmentation in heat transfer is around 4.3 times greater than the plain tube and friction factor is about 1.28 with 5 VG insets. The results indicate a promising heat exchanger enhancement in the local petroleum industries.

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Exergy analysis of heat transfer in a turbulent pipe flow by a decaying swirl generator

Cited by 8 publications

References 10 publications

Entropy generation and exergy destruction in two types of wavy microchannels working with various aqueous nanofluids using a multi-phase mixture model

Entropy generation and exergy destruction in two types of wavy microchannels working with various aqueous nanofluids using a multi-phase mixture model

Cascaded Thermodynamic and Environmental Analyses of Energy Generation Modalities of a High-Performance Building Based on Real-Time Measurements

Thermo-hydraulic performance evaluation of heat exchanger tube with vortex generator inserts

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