The Effect of Holes Number in Cylindrical Samples on the Forced Convection Heat Flow

Kadhim, Saif Ali; Ibrahim, Osama Abd AL-Munaf

doi:10.18178/ijmerr.11.6.429-436

Cited by 4 publications

(3 citation statements)

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“…When heated, modified SBC, the gaps or pores between the hot fibers create air disturbances and vortices that lead to an increase in the heat transfer coefficient. 54,55 In addition, these fibers increase the surface area for heat transfer. Increasing the heat transfer coefficient inside the box accelerates the heating of the water inside the pot, and thus the water temperatures rise to a higher level, and the heating parameters and thermal performance in general improve.…”

Section: Overall Evaluation Of Resultsmentioning

confidence: 99%

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Enhancement the solar box cooker performance using steel fibers

Ibrahim,

Kadhim,

Ali

2024

Heat Trans

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The use of fossil fuel and wood for cooking poses health, environmental, and economic challenges, especially with the growing population. This has led to an increase in the trend towards the use of clean and sustainable cooking sources, including solar cookers. This experimental study aims to contribute by enhancing the performance of a solar box cooker (SBC) according to the concept of porous media via adding steel fibers inside the box as a modified SBC and comparing it with a conventional SBC. The stagnation test to determine the first figure of merit and the load test to determine the second figure of merit, standard boiling time, and cooker optothermal ratio were conducted under the outdoor conditions of Baghdad city. Also, an energy and exergy efficiency analysis, and calculating the rate of heat loss by three water loads heating and cooling tests. The results revealed that the modified SBC has a higher thermal performance than the conventional SBC.

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Section: Overall Evaluation Of Resultsmentioning

confidence: 99%

“…This is due to the presence of steel fibers. When heated, modified SBC, the gaps or pores between the hot fibers create air disturbances and vortices that lead to an increase in the heat transfer coefficient 54,55 . In addition, these fibers increase the surface area for heat transfer.…”

Section: Resultsmentioning

confidence: 99%

Enhancement the solar box cooker performance using steel fibers

Ibrahim,

Kadhim,

Ali

2024

Heat Trans

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“…( 1), and thus a reduction in power consumption. Moreover, dropping in the refrigerant mass flow rate leads to a decrease in the fluid velocity inside the pipes, which leads to a decrease in the heat transfer coefficient [31], thus the heat losses to the ambient are reduced. This dropping may affect the rates of heat rejection in the condenser and heat removal in the evaporator according to Eqs.…”

Section: Refrigerant Mass Flow Ratementioning

confidence: 99%

Evaluating Refrigerant Purity Characteristics: An Experimental Approach to Assess Impact on Vapor-Compression Refrigeration System Performance

Ali,

Kadhim,

Ibrahim

2023

IJHT

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This study embarks on a comprehensive exploration of the influence exerted by refrigerant purity characteristics on vapor-compression refrigeration systems performance. The investigation particularly delves into the effects on domestic applications, such as chest freezers. Deviations from the ideal refrigerant characteristics, as stipulated by the AHRI-700 standard, can provoke detrimental repercussions, including augmented power consumption and diminished coefficient of performance. In this empirical analysis, three R134a refrigerant samples, each with varying degrees of conformity to the AHRI-700 standard, were scrutinized. Sample 1 with superior characteristics, sample 2 with medium characteristics, while sample 3 with substandard characteristics. The samples were subjected to identical ambient conditions within a 145-liter chest freezer operating at a temperature of 32℃. The findings unequivocally underscored a correlation between refrigerant purity and system performance. Sample 1, with optimal characteristics, demonstrated superior performance, consuming less power (120.7 W) and delivering a higher coefficient of performance (2.33) in comparison to sample 2 (138 W, 2.07) and sample 3 (147 W, 1.93). These results emphatically emphasize the necessity of stringent refrigerant selection, predicated on purity characteristics, to best performance of vaporcompression refrigeration systems.

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