Vacuum Effect on the Performance of Solar Air Collector with Micro-Channel Absorber Plate

Jalil, Jalal M.; Abdulkadhim, Nashwa A.Abdulkadhim A.

doi:10.30684/etj.37.8a.6

Cited by 1 publication

(2 citation statements)

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“…Where: A c : Collector area (m 2 ), I: Solar radiation (W/m 2 ). For pulsating flow, the frequency and the mass flow rate can be calculated as follows [30]: (4) Where: f: Pulsating frequency (Hz), N: Rotating speed of the ball valve (rpm). (5) Where: m .…”

Section: )mentioning

confidence: 99%

“…Solar energy is an unlimited source of clean energy [1], and it contributes to reducing pollution levels, as harvesting and converting solar energy into other energy types do not result in any kind of pollutants [2]. Solar energy can be converted directly into electric energy by using photovoltaic systems [3] or into thermal energy by using different systems such as solar collectors [4], solar towers [5], etc. Solar air heaters are considered the simplest among all solar systems because of their low cost, ease of construction, and low maintenance [6].…”

Section: Introductionmentioning

confidence: 99%

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Thermal Performance of a Counter-Flow Double-Pass Solar Air Heater With The Steady and Pulsating Flow

Hussein¹,

Ahmed²,

Ekaid³

2022

ETJ

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 The tubular solar absorber is placed perpendicularly to the direction of airflow.  Pulsating flow increases the thermal performance by up to 15.2%  Thermal performance is directly proportional to the pulsating frequency.The present work studied the influence of pulsating flow as an active method on the thermal performance of a double-pass solar air heater with a tubular solar absorber. A ball valve has been used as a pulse generator mounted at the downstream flow of the solar air heater. The experiments were under indoor conditions with a constant heat flux of 1000 W/m 2 , and different air mass flow rates ranged from 0.01 to 0.03 kg/s. Moreover, the study covered three pulsation frequencies varied from 1 to 3 Hz. Based on the experimental outcomes, it can be observed that the heat transfer rate is enhanced by applying the pulsating flow, where it was found that the outlet temperature in the case of applying the pulsating flow rises by about 25.6 -27% as compared with the steady flow case. Moreover, pulsating flow offers a higher effective thermal performance by about 15.2 % at the maximum air mass flow rate compared with the steady flow. In addition, the findings pointed out that varying the pulsation frequency from 1 to 3 Hz produces an enhancement in heat transfer rate and in solar heater effective efficiency, where it was found that when changing the frequency from 1 to 3, the increment of effective efficiency ranged from 3.8 to 6.9 % depending on the air mass flow value.

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confidence: 99%