TY  - JOUR
T1  - Effects of Air Bubble Injection on the Efficiency of a Flat Plate Solar Collector:
An Experimental Study for the Open Flow System
AU - Qasim Mohammed, Heba AU - Baqir, Ali Sh. AU - Khwayyir Hasan, H.S. 
JO  - Journal of Engineering and Applied Sciences
VL  - 15
IS  - 7
SP  - 1703
EP  - 1708
PY  - 2020
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2020.1703.1708
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2020.1703.1708
KW  - thermal efficiency
KW  -different water
flow rate
KW  -micro or small air bubbles injection
KW  -Solar flat plate collector with tubes risers
KW  -temperature
AB  - This study aims to study experimentally with and without the effects of small air bubble injection
on the efficiency of a flat plate solar collector with tube rises for open flow system. The variation of the thermal
efficiency of the solar flat plate collector due to both different of the water flow rate and due to the air bubbles
injection with air flow rates are evaluated. A new experimental procedure for injecting small air bubbles into
the riser tubes of solar flat plate collector is proposed. The comparison between the effects of forced water flow
rates and air bubbles injection on the solar flat plate thermal efficiencies with a variation of solar radiation
intensity were investigated. Water and air flow rate were changed between 1.5-2.5 LPM with inlet water
temperature ranged between 19-23.5°C. Observations showed that the injecting of air bubbles inside the solar
flat plate tubes risers play key roles on the effect of thermal efficiency more than that of using the water flow
rate without air bubbles injection. Small air bubbles injecting into the risers tubes of the flat solar collector
causes enhancement of the thermal efficiency and it increased 3.5-5.25% depending on air flow rate.
ER  -