Experimental validation and numerical investigation for optimization and evaluation of heat transfer enhancement in double coil heat exchanger

Ali, Senaa Kh.; Azzawi, Itimad D. J.; Khadom, Anees A.

doi:10.1016/j.tsep.2021.100862

Cited by 19 publications

(10 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To forecast the heat transport in intricate geometries, the grid system's development and refining are crucial. In other words, accuracy is greatly influenced by the density and dispersion of the grid lines [23][24][25][26][27][28][29]. ANSYS-Fluent 17.0, a commercial CFD software tool, is used to run numerical simulations.…”

Section: Figure 2 Meshing Of Receiver Geometrymentioning

confidence: 99%

Numerical Study of the Parabolic Dish Solar Collector Performance Evaluation Using Heat Exchanger Receiver

Majel,

Obaid,

Zidane

2023

IJHT

View full text Add to dashboard Cite

The solar water heater is one of the most important applications used to invest in renewable energy, specifically solar energy, where hot water can be used for air conditioning, household uses, or industrial purposes. In this work, a new system was established for the production of hot water and steam using solar concentrators of the solar dish type, made of aluminum, having a (175 cm) diameter and a deepness of (15 cm) with a heat exchanger (radiator) as a receiver which is a new and innovative way of working. The front side of the dish was covered with strips of nickel metal reflecting sunlight to focus the solar radiation on a tank fixed at the center of the focus of the rays reflected from the dish. A heat exchanger (radiator) was used as a tank with the following dimensions (50cm×40cm×5cm) and a capacity of (4 liters). Numerical calculations were carried out using (Solidworks) and (Ansys workbench) to design and analyze this system. The simulated data revealed that the focus's placement and the spacing of the dishes are governed by the dish's size and the degree of inclination. The concentration ratio increases by (53%) when the dish diameter increases. The use of a radiator heat exchanger gives the largest use of solar-reflected radiation that is reflected from the collector because of the increased surface area exposed to solar radiation due to the presence of fins. The highest thermal efficiency (72.16%) was obtained at 355 K and a mass flow rate of 0.32 kg/sec.

show abstract

Section: Figure 2 Meshing Of Receiver Geometrymentioning

confidence: 99%

Numerical Study of the Parabolic Dish Solar Collector Performance Evaluation Using Heat Exchanger Receiver

Majel,

Obaid,

Zidane

2023

IJHT

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

“…In recent years, a variety of experimental and computational methodologies for transferring energy from one fluid to another have been used in a variety of engineering applications. [1][2][3][4][5] Greenhouse gas emissions are a major source of the global warming problem, according to the World Energy Agency, around 29,381 million tons of carbon dioxide (CO 2 ) are due to the consumption of oil, gas, and coal products. 6 Solar energy is therefore commonly used in numerous applications since solar energy conversion proves to be an environmentally sustainable, affordable source of energy that is usable during the year.…”

mentioning

confidence: 99%

The experimental study of energy features for solar air heaters with different turbulator configurations

2022

View full text Add to dashboard Cite

To assess the thermal performance in the climate conditions of western and central Iraq, the advantages of using a solar air collector with various turbulator absorber plates are experimentally explored. Four distinct kinds of absorber plates are provided flat plate (F), triangular (T), rectangular (R), and circular (C) turbulators at different air mass flow rates. The collector's economic properties and overall thermal performance are compared to the conventional flat plate turbulator heating systems. The main findings suggest that delta turbulators improve collector economics and overall thermal performance by generating vortex and dampening the formation of the thermal boundary layer in the direction of airflow. Furthermore, when the mass flow rate increases, the thermal performance improves, and the efficiency increases for all mass flow rates, resulting in good thermal performance for the rectangular plate collector when compared to other collectors. When compared to other types of configurations, the daily average efficiency of solar air collectors for flat plate (F), triangular (T), rectangular (R), and circular (C) turbulators are 28%, 67%, 39%, and 48%, respectively, at 50° tilt angle while at 90° tilt angle they are 44%, 76%, 54%, and 63%, respectively, as ṁ = 0.0377 kg/s. The maximum daily average efficiency fitted with rectangular turbulators have about 86% at the largest ṁ = 0.1 kg/s. This study will also give a unique direction to the work trend in the western and central parts of Iraq throughout the winter months.

show abstract

“…6–9 In a thermodynamic system, free convection is a heat transfer process in which fluid motion is caused by density differences in the fluid due to temperature gradients rather than using pumps or fans, or any other types of external forces. 10,11 Furthermore, several computational and experimental studies on the utilization of nanoparticles, 12–14 porous media 15–18 and phase change materials 19 in diverse applications to increase heat transfer rate have been conducted.…”

Section: Introductionmentioning

confidence: 99%

Computational optimum design of natural convection in a concentric and eccentric annular cylinder using nanofluids

Azzawi

Hasan

Yahya

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

View full text Add to dashboard Cite

Free convection of various nanofluids inside concentric and eccentric annular cavity with internal heat flux, fully filled with porous media is studied numerically and its heat transfer rate and pressure drop are examined. The impact of inner cylinder inclination angles (βecc = 45°, 135°, 225°, and 270°) and nanofluids (Al2O3/water, CuO/water and SiO2/water) for different heat flux (1000, 2000, 3000, and 4000 w/m2) on the heat transfer rate are evaluated. Initially, a validation process has been implemented to ensure that the predicted results obtained from this model are accurate. Results indicate that Al2O3 Nanofluid provides a better enhancement in the heat transfer rate when compared to SiO2 and Cu Nanofluids. Furthermore, the heat transfer coefficient increased with the inclination angle of βecc = 225°, and maximum heat transfer occurred at a heat flux of 4000 W/m2, which was roughly 6% greater than the concentric annular cylinder. The findings also indicated that while increasing the eccentricity has a minor impact on the heat transfer rate for convection-dominated flows (high heat flux), on the other hand, it has a significant impact on the heat transfer rate for conduction-dominated flows (low heat flux).

show abstract

Experimental validation and numerical investigation for optimization and evaluation of heat transfer enhancement in double coil heat exchanger

Cited by 19 publications

References 34 publications

Numerical Study of the Parabolic Dish Solar Collector Performance Evaluation Using Heat Exchanger Receiver

Numerical Study of the Parabolic Dish Solar Collector Performance Evaluation Using Heat Exchanger Receiver

The experimental study of energy features for solar air heaters with different turbulator configurations

Computational optimum design of natural convection in a concentric and eccentric annular cylinder using nanofluids

Contact Info

Product

Resources

About