The impact of square shape perforations on the enhanced heat transfer from fins: Experimental and numerical study

Ibrahim, Thamir K.; Al-Sammarraie, Ahmed T.; Al-Jethelah, Manar; Doori, Wadhah H. Al; Salimpour, Mohammad Reza; Tao, Hai

doi:10.1016/j.ijthermalsci.2019.106144

Cited by 50 publications

(13 citation statements)

References 34 publications

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“…This statement also supported by Nada et al, [24]. ASHRAE standard (2017) [7,19] suggested that temperature at the floor should be within the range of 19°C to 29 °C to avoid 'cold feet' effect [13]. The temperature in the room increases as the height increases.…”

Section: Temperature Distributionmentioning

confidence: 70%

“…Figure 6 compares the contours of the temperature distribution of reference [13,19] and this study. It can be noticed that there are cooler regions spotted at the back of the occupant while warmer region at the front side.…”

Section: Temperature Distributionmentioning

confidence: 86%

“…Therefore, it was believed that the quadrilateral mesh type was a reasonable choice to be used for this CFD model. It worth to mention that the idea behind the mesh generation is to discretize the governing equations and solve them inside each of the subdomains or element [19]. Element size refers to the size of the subdomains.…”

Section: Computational Fluid Dynamics (Cfd) Model and Simulationmentioning

confidence: 99%

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Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems

Ismail

Al-Muhsen

Johari

2021

CFDL

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Underfloor and overhead air distributions are two types of Heating Ventilating and Air Conditioning (HVAC) system in which both differs in term of channelling the supplied air into a space. Underfloor air distribution (UFAD) system channels the supplied air from the underfloor plenum and goes to the return vent at the ceiling. On the other hand, the overhead air distribution (OHAD) system utilizes the ceiling-to-ceiling air pathway approach. In this study, A developed HVAC model was proposed. Ansys Fluent program was used to numerically investigate the best thermal comfort of the proposed model in terms of occupant satisfaction by referring to ASHRAE Standard. Two scenarios were designed and adopted in the computational investigation which is OHAD and UFAD. Three heat-generating parameters were involved which are a room lamp, personal computer and occupant. The attained computational fluid dynamic (CFD) simulation results were validated. Generally, the attained CFD results showed that the UFAD system could perform better compare to the OHAD system even though the OHAD system could have some benefits. Specifically, the UFAD system provided the best thermal performance whereas the OHAD system was found to be less efficient in providing thermal comfort to the occupant and consumed a greater amount of energy because it was required to cool down the whole room instead of being cooled partly. The CFD results confirmed that the UFAD system was capable of maintaining the room temperature at 26°C at a height below 2.0 m compared to 1.2 m of the OHAD system. In conclusion, the UFAD system could provide better indoor air quality, and it could have superior performance for the tropic weather regions such as Malaysia compared to that of the OHAD system. Besides, using the UFAD system could be represented a preventive action that could be proposed to solve the mould growth inside any occupied room.

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Section: Temperature Distributionmentioning

confidence: 70%

Section: Temperature Distributionmentioning

confidence: 86%

Section: Computational Fluid Dynamics (Cfd) Model and Simulationmentioning

confidence: 99%

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Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems

Ismail

Al-Muhsen

Johari

2021

CFDL

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“…Plate fins with variously shaped geometric holes have been the subject of several investigations (Ibrahim et al, 2020;AlEssa et al, 2009). Forced convection heat transfer could be improved by using * Corresponding author.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Nusselt, Reynolds Number, and Pressure Drop on the Thermal Performance of Pierced Pin Fins

Doori¹

2022

Front. Heat Mass Transf.

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Perforated fin forced convection heat transfer is the primary focus of this investigation. The purpose of this research is to see if perforated pin fins can help with heat transmission in the devices. Each pin's perforation diameter and number of holes are rigorously examined. The Nusselt numbers for perforated pins are 47 percent higher than those for solid pins, according to the study, and this number raises as the number of holes increases. The pressure drop is reduced by 19% when perforated pins are used instead of solid pins. Heat transmission in a round-holed pin fin was studied using forced convection in tests. Perforations in the shape of circles were among the options available. For the sake of this investigation, a number of perforations were made. For example, all of the fins and readings have one to four perforated holes. Perforated fins can promote heat transfer because of the improved Nusselt number, increased convective heat transfer coefficient, and decreased pressure gradient provided by this model is 40% smaller and up to 85% more effective at transferring heat. As a result, eddy currents are lessened.

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“…Second law-based exergy analysis provides a better view of the energy losses to the environment and the process-related internal irreversibility. It can evaluate both process and devices performances as it considers the exergy at different stages during the process of energy conversion [1,[25][26][27][28][29][30][31][32][33][34][35][36][37][38]. The concept of exergy analysis was first detailed by Carnot in 1824 and furthered by Clasisus in 1865.…”

Section: Introductionmentioning

confidence: 99%

Parametric Assessment of The Thermal Performance of Coal-Fired Power Plant

Khaleel

Ismail

Ibrahim

2021

ARFMTS

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Exergy analysis has been found to be a useful method for improving the conversion efficiency of energy resources, since it helps to identify locations, types and true magnitudes of wastes and losses. It has also been applied for other purposes, such as distinguishing high- from low-quality energy sources or defining the engineering technological limits in designing more energy-efficient systems. To identify locations, types, and actual magnitudes of energy losses; exergy analysis has been found to be a valuable way for enhancing the conversion efficiency of the different energy systems. The aim of this research is to analyze the effect of the operation conditions on the performance of coal-fired power plants. As well, this study focuses on the effect of different feedwater heaters' numbers that lead to the highest exergy destruction of the coal-fired power plants. For different values of the superheated steam temperature and the pressure, a parametric study was conducted to determine the efficiency of the coal-fired power plant. The results show that, when the pressures and temperature of the superheated steam increases the evaporator temperature will increases too. Increasing the temperature of evaporator rises the average maximum temperature of the cycle, which improves the thermal efficiency of the cycle as well as the powerplant efficiency. The results show that, at higher boiler pressures and temperatures, the temperature difference between the water/steam and hot gases of the boiler is reduced which means the irreversibility associated with the heat transfer process decreases. Therefore, by increasing the pressure and temperature of the superheater, the exergy efficiency of the thermal cycle is improved. It was observed that operating the coal-fired power plant at high superheated pressure and temperatures produce lead to reduce the exergy losses.

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The impact of square shape perforations on the enhanced heat transfer from fins: Experimental and numerical study

Cited by 50 publications

References 34 publications

Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems

Thermal Comfort Analysis for Overhead and Underfloor Air Distribution Systems

The Effects of Nusselt, Reynolds Number, and Pressure Drop on the Thermal Performance of Pierced Pin Fins

Parametric Assessment of The Thermal Performance of Coal-Fired Power Plant

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