Performance improvement of wire mesh packed double-pass solar air heaters with external recycle

Ho, Chii‐Dong; Lin, Chunsheng; Chuang, Yu-Chuan; Chao, Chun-Chieh

doi:10.1016/j.renene.2013.02.005

Cited by 70 publications

(28 citation statements)

References 26 publications

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“…It is seen from Table 2 that the heat-transfer efficiency improvement of the wire mesh packed solar air heater is higher than that of the flat-plate type without attaching the wire mesh. The present work is actually the extension of the previous work [17] except for the different type of the external recycle. The graphical representation for comparisons with some experimental results and theoretical predictions obtained in [17] under the same design and operating parameters were illustrated to explain how the present device is preferred to be employed, as confirmed by Figure 6.…”

Section: Resultsmentioning

confidence: 90%

“…The present work is actually the extension of the previous work [17] except for the different type of the external recycle. The graphical representation for comparisons with some experimental results and theoretical predictions obtained in [17] under the same design and operating parameters were illustrated to explain how the present device is preferred to be employed, as confirmed by Figure 6. This is the value and originality of the present device.…”

Section: Resultsmentioning

confidence: 90%

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Device Performance Improvement of Double-Pass Wire Mesh Packed Solar Air Heaters under Recycling Operation Conditions

Chang

Lin

et al. 2016

Energies

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Abstract:The improvement of device performance of a recycling solar air heater featuring a wire mesh packing was investigated experimentally and theoretically. The application of the wire mesh packing and recycle-effect concept to the present study were proposed aiming to strengthen the convective heat-transfer coefficient due to increased turbulence. Comparisons were made among different designs, including the single-pass, flat-plate double-pass and recycling double-pass wire mesh packed operations. The collector efficiency of the recycling double-pass wire mesh packed solar air heater was much higher than that of the other configurations for various recycle ratios and mass flow rates scenarios. The power consumption increment due to implementing wire mesh in solar air heaters was also discussed considering the economic feasibility. A fairly good agreement between theoretical predictions and experimental measurements was achieved with an analyzed error of 1.07%-9.32%.

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Section: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 90%

Device Performance Improvement of Double-Pass Wire Mesh Packed Solar Air Heaters under Recycling Operation Conditions

Chang

Lin

et al. 2016

Energies

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“…Hans et al [6] used multiple V-shaped AR in single pass SAH and obtained a maximum Nusselt number (Nu) for P/e value of 8. Ho et al [7] Collector efficiency of double pass SAH is evaluated. Han et al [8] seen the effect of artificial roughness on heat transfer and friction factor for two opposite roughened surfaces.…”

Section: IImentioning

confidence: 99%

Experimental Analysis of Double Flow Solar Air Heater by using Multiple Arc Shape Baffle as Artificial Roughness- A Review

Ray¹

2018

IJRASET

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In the present paper, a comprehensive investigation on solar air heater for heating air having circular wire rib with artificial roughness in the form of arc shape on the back side of absorber plate, has been carried out. Artificial roughness used on the absorber plate is efficient method to improve performance of solar air heater. In present investigation on performance calculation of Solar Air Heater with arc shaped wire rib with artificial roughness absorber plate has been carried out by mathematical model and it is compared with a plane absorber Solar Air Heater. Multiple arc shaped ribs of double flow gives better heat transfer. All the parameters in this investigation has been decided on the basis of practical consideration of the system and operating condition of solar air heaters. In this investigation the parameters are taken such as relative roughness height(e/d) and angle of attack(α/90) have been studied on Nusselt number(Nu) and friction factor(f) with Reynolds number(Re) varies from 2000 to 17000.

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“…By following the similar mathematical treatment performed in our previous work [26], two simultaneous ordinary differential equation were obtained providing energy balances for the glass cover, absorber plate, bottom plate and both upper and lower subchannels, and rearranging with some algebraic equation manipulations as follows:…”

Section: Temperature Distributions On Wire Mesh Packed Solar Air Heatersmentioning

confidence: 99%

“…Moreover, the forced convection enhancement due to the recycle-effect application in double-pass operations has been reported in numerous heat-and mass-transfer problems such as loop reactors [22], air-lift reactors [23], draft-tube bubble columns [24] and thermal diffusion columns [25], resulting in improved device performance. In the present work, a new double-pass solar air heater configuration that is actually the extension of the previous work [26], is studied theoretically and experimentally by adding packing wire mesh into the lower subchannel under recycling operation. An attempt has been made in the present study to: (a) provide a brief outline of both theoretical predictions and experimental results in the a wire mesh packed double-pass solar air heater; (b) discuss the exaggeration of the device performance of the effects of recycle ratio and wire mesh packing; and (c) examine the economic considerations regarding both heat-transfer efficiency improvement and power consumption increase.…”

Section: Introductionmentioning

confidence: 97%

Recycle Effect on Device Performance of Wire Mesh Packed Double-Pass Solar Air Heaters

Lin

Yang

et al. 2014

Energies

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Abstract:A new device for inserting an absorber plate to divide a flat-plate channel into two subchannels to conduct double-pass wire mesh packed operations was developed. The proposed wire mesh packed device improves the heat transfer efficiency substantially as compared that to flat-plate single-pass and double-pass operations using the same working dimensions, and the improvement of device performance was investigated experimentally and theoretically. Good agreement between the theoretical prediction and the measured values from the experimental results was achieved. Considerable heat transfer improvement was obtained employing wire mesh packed double-pass operations under the absorber plate with external recycle. The influences of recycle ratio on the heat transfer efficiency and the power consumption increase were also discussed.

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Performance improvement of wire mesh packed double-pass solar air heaters with external recycle

Cited by 70 publications

References 26 publications

Device Performance Improvement of Double-Pass Wire Mesh Packed Solar Air Heaters under Recycling Operation Conditions

Device Performance Improvement of Double-Pass Wire Mesh Packed Solar Air Heaters under Recycling Operation Conditions

Experimental Analysis of Double Flow Solar Air Heater by using Multiple Arc Shape Baffle as Artificial Roughness- A Review

Recycle Effect on Device Performance of Wire Mesh Packed Double-Pass Solar Air Heaters

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