Performance evaluation of a natural-convection solar air-heater with a rectangular-finned absorber plate

Pakdaman, M. Fakoor; Lashkari, A.; Tabrizi, Hassan Basirat; Hosseini, Reza

doi:10.1016/j.enconman.2010.09.017

Cited by 82 publications

(7 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Mostly, the initial conditions for a double-pass (counter flow) solar air heater are; for the first air flow stream, at x = 0 , T f1,i = T a , for the second air flow stream, at x = L, T f2,i = T f1,o . The thermal efficiency of the solar air collector is determined by [30,31].…”

Section: Thermal Analysis Of the Double-pass Solar Air Heatermentioning

confidence: 99%

See 1 more Smart Citation

Parametric study of a solar dryer system for the development and application of solar energy in Sierra Leone

Bangura¹,

Hantoro²,

Fudholi³

et al. 2022

J Appl Eng Science

View full text Add to dashboard Cite

A transient mathematical model has been evaluated to determine the principle of a solar crop dryer for drying vegetables (onion). Considering the meteorological conditions of Freetown (Latitude 8.4840 N, Longitude -13.2300 W), the model was developed to determine air temperatures and other operational parameters of the drying system for a day of March 21st. However, the investigated system had effectively reduced the drying process of onion. The developed double-pass solar air collector system showed a low-temperature output in the morning hours and displayed high-temperature results in the afternoon hours. From 8:00 to 16:00, the solar collector generates fluid output temperatures above 50 0C, with a peak value of 96 0C occurred at 12:00. The influence of the mass flow rate on the system's thermal efficiency was investigated. It was noticed that for a certain solar radiation value, an increased in the mass flow rate caused an exponential increased in the solar air collector thermal efficiency. Findings also revealed that an increased in the solar collector length led to a slightly decreased in the outlet air temperatures at a mass flow rate of 0.02 kg/s. The influence of increasing drying air temperatures and air velocity within the drying chamber reduces drying time significantly. The drying time for products dried in the first tray is lesser than for products dried in the subsequent trays, owing to temperature variations. The computation findings were verified to previous studies in the literature and observed to be strongly comparable.

show abstract

Section: Thermal Analysis Of the Double-pass Solar Air Heatermentioning

confidence: 99%

“…The heat transfer coefficients for the various modes are determined accordingly, such as [31,32]. Heat transfer coefficient due to wind by convection:…”

Section: Estimation Of Heat Transfer Coefficientsmentioning

confidence: 99%

Parametric study of a solar dryer system for the development and application of solar energy in Sierra Leone

Bangura¹,

Hantoro²,

Fudholi³

et al. 2022

J Appl Eng Science

View full text Add to dashboard Cite

show abstract

“…Pakdamann et al, [40] investigated experimentally the different thermal characteristics of natural convection solar air heater which has been incorporated with longitudinal fin array. From the investigation it has been concluded that heat transfer of solar air heater can be enhanced by the attachment of longitudinal rectangular fins array.…”

Section: Fins and Baffles/vortex Generatormentioning

confidence: 99%

A Review on Heat Transfer Enhancement of Solar Air Heater Using Various Artificial Roughed Geometries

Panda

Kumar

2021

ARFMTS

View full text Add to dashboard Cite

Solar air heater acts as one of the important components in utilization of solar energy. The air heater absorbs the irradiance and converts it into heat energy at the absorbing surface. The thermal energy is further use in heating flowing air through the duct. Solar air heaters are cost effective as well as simple in design. Solar air heater can be used in space heating, timber seasoning and agricultural drying. In spite of all these advantages the solar air heater has certain challenges such as the air has low heat transfer coefficient. The heat transfer rate from the heated absorber surface to the air is low. Hence in order to enhance the heat transfer coefficient the surface area either increases or the flow made to be turbulent. In order to do so the artificial roughened element must be incorporated on the heated surface. The use of artificial roughness is considered as an effective technique to enhance the heat transfer rate of fluid flowing through the duct of solar air heater. The heat transfer and friction characteristics of number of roughness geometries incorporated solar air heater have been investigated. In this paper an attempt has been made to review on element geometries used as artificial roughness in solar air heater in order to improve thermal and thermo hydraulic performance of solar air heater ducts.

show abstract

“…Another method to augment the SAH's thermal efficiency is extending the area of heat transfer. Pakdaman et al [25] assessed the thermal performance of an SAH incorporating a longitudinal rectangular fin under natural convection conditions and reported that integrating the fin could achieve a heat transfer enhancement of about 20%. Fudholi et al [26] evaluated the performance and cost-effectiveness of a double-pass SAH with longitudinal fins.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Augmentation and Friction Factor Due to the Arrangement of Rectangular Turbulators in a Finned Air Channel of a Solar Air Heater

An,

Choi,

Choi

2023

Energies

View full text Add to dashboard Cite

In this study, the heat transfer augmentation and friction factor of a novel type of solar air heater (SAH), which incorporates longitudinal fins and rectangular turbulators, were investigated numerically with different arrangements of the turbulators. The effects of arrangements of rectangular turbulators placed in a finned air channel on its heat transfer augmentation and friction factor are discussed for Reynolds numbers ranging from 3000 to 15,000 using commercial ANSYS 17.2 software. Four different arrangements are investigated, including Array A, which places turbulators on both the fin’s side and base surfaces at the same position; Array B, where turbulators are sequentially placed on the fin’s side and base surfaces; Array C, where turbulators are only placed on the side surface; and Array D, where turbulators are placed only on the base surface. Array A showed the highest heat transfer augmentation and friction factor among the investigated arrangements. However, the highest thermo-hydraulic performance (THP), considering both the heat transfer augmentation and friction factor, was obtained in Array B, with a value of 1.36. Consequently, Array B was regarded as the most appropriate and effective arrangement method for the finned air channel of a SAH.

show abstract

Performance evaluation of a natural-convection solar air-heater with a rectangular-finned absorber plate

Cited by 82 publications

References 18 publications

Parametric study of a solar dryer system for the development and application of solar energy in Sierra Leone

Parametric study of a solar dryer system for the development and application of solar energy in Sierra Leone

A Review on Heat Transfer Enhancement of Solar Air Heater Using Various Artificial Roughed Geometries

Heat Transfer Augmentation and Friction Factor Due to the Arrangement of Rectangular Turbulators in a Finned Air Channel of a Solar Air Heater

Contact Info

Product

Resources

About