Design a low-cost, medium-scale, flat plate solar air heater: An experimental and simulation study

Abbas, Sajid; Yuan, Yanping; Hassan, Atazaz; Zhou, Jinzhi; Ji, Wenhui; Chen, Yu; Rehman, Ubad Ul; Yousuf, Saima

doi:10.1016/j.est.2022.105858

Cited by 21 publications

(3 citation statements)

References 46 publications

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“…A staggered V-shaped twisted rib was investigated using the LCT technique to visualize the fluid flow [5]. The thermal efficiency of SAH was improved with the use of double glazed finned steel absorber plate [8]. Augmentation in heat transfer rate is observed while using petal shaped and a quarter cylinder rib in compression with a square rib [9].…”

Section: Greekmentioning

confidence: 99%

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Singha,

Lanjewara

2024

Archives of Thermodynamics

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This study aims to investigate and compare the thermal performance of a solar air heater using a passive technique to enhance heat transfer between the absorber plate and the flowing fluid. The technique involves generating turbulence near the heat transferring surface through the use of artificial rib roughness. The study focuses on two different novel roughness geome-tries: full symmetrical arc rib roughness and half symmetrical arc rib roughness. By introducing additional gaps and varying the number of gaps in the roughness geometries, the study examines their effects on the solar air heaters thermal performance. The artificially roughened surface creates different turbulent zones, which are essential to the development of different types of turbulence in the vicinity of the heat transferring surface. The study finds that an optimal escalation in Nusselt number and friction factor by 2.36 and 3.45 times, respectively, occurs at certain gap numbers as 6 and ng as 5 for full symmetrical arc rib roughness. The maximum thermal-hydraulic performance parameter of 1.66 is attained at a Reynolds number of 6 000. The study also conducts correlation, mathematical modeling, and performance prediction under different operating circumstances.

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Section: Greekmentioning

confidence: 99%

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Singha,

Lanjewara

2024

Archives of Thermodynamics

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“…A higher h rate is obtained by disturbing the laminar sub-layer by providing an rib element on the absorber surface. 5 Rib element generates turbulence near the absorber surface of a roughened SAH. 6 The provision of rib on the absorber surface not only enhances h and makes the SAH system more efficient but also escalates frictional losses.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance of solar air heater having discrete symmetrical arc rib with staggered rib roughness

Singh

Lanjewar

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This paper investigates physics of forced flow underneath the absorber plate in solar air heater (SAH) integrated with new arc geometry namely discrete symmetrical arc rib with staggered rib roughness. This article signifies the impact of roughness pitch relative to rib height (p/e) on the thermal performance of rectangular roughened SAH duct having discrete symmetrical arc rib with staggered rib (present study). Novel arc rib geometry (present study) is achieved by providing an additional gap in a significantly long continuous arc segment of existing best arc rib geometry to break the boundary layer reformation along it. Range of parameters considered for experimental run for new geometry were Reynolds number (Re) as 3000–15,000, roughness pitch relative to rib height (p/e) of 6–14, flow attack angle (α) of 30°, staggered rib pitch relative to roughness pitch (p′/p) of 0.4, number of symmetrical gap over full arc (Ng) as 6, number of additional gap in symmetrical arc elements (ng) as 5, gap width relative to rib height (g/e) as 3, rib height relative to hydraulic diameter (e/Dh) as 0.043, relative gap position (d/w) and additional gap width relative to rib height (g′/e) as 0.65 and 1 respectively. Five different roughened test plate with the variation of p/e as 6, 8, 10, 12, and 14 were tested. Optimum augmentation is perceived in Nu at p/e as 10 and for f at p/e as 8. Maximum thermo-hydraulic performance parameter (THPP) is achieved at p/e as 10 that corresponds to Re as 6000. Correlation, mathematical model, performance prediction and economic evaluation have also been done under different operation conditions.

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“…Vengadesan and Senthil 8 reviewed the various advancement in the field of flat plate solar air heater (FP‐SAH), it was observed that by using inserts, baffles, and turbulators, the performance of FP‐SAH was increased. Abbas et al, 9 examined the performance of FP‐SAH. The mean temperature difference of air was 40°C with mean system's efficiency of 56.01%.…”

Section: Introductionmentioning

confidence: 99%

Experimental comparison of solar air heater based on single and double‐ends open evacuated tube collector

Tiwari,

Kumar

2023

Env Prog and Sustain Energy

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The hot air has a lot of applications like drying, space heating, desiccant air conditioning and desalination, which attracts the attention of researchers towards the system used for producing the hot air. In the present work, two different solar air heaters that is, double‐ends open evacuated tube based solar air heater (system 1) and single‐end open evacuated tube based solar air heater (system 2) are proposed and compared experimentally. The aperture area of each system is 4.687 m2 and operated under same weather conditions. The experiments are performed at three different mass flow rates of the process air that is, 153.21, 207.94, and 246.24 kg/h. The highest mean air temperature difference is 62.91 and 48.8°C for system 1 and system 2 respectively at mass flow rate of 153.21 kg/h. The highest mean energy and exergy efficiency obtained by the system 1 and system 2 are 81.55%, 6.80%, and 65.45% and 4.25% respectively. The present work is also compared with the work presented in literature and it is observed that double‐end open evacuated tube collector has significantly high energy and exergy efficiency with higher hot air temperature.

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Design a low-cost, medium-scale, flat plate solar air heater: An experimental and simulation study

Cited by 21 publications

References 46 publications

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Experimental investigation and performance prediction of SAH using different arc rib roughness geometries – A comparative study

Thermal performance of solar air heater having discrete symmetrical arc rib with staggered rib roughness

Experimental comparison of solar air heater based on single and double‐ends open evacuated tube collector

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