Abstract

 Experimental investigation of the influence of inserting the metal foam to the solar chimney to induce natural ventilation are described and analyzed in this work. To carry out the experimental test, two identical solar chimneys (without insertion of metal foam and with insertion of metal foam) are designed and placed facing south with dimensions of length× width× air gap (2 m× 1 m× 0.2 m). Four incline angles are tested (20o,30o,45o,60o) for each chimney in Baghdad climate condition (33.3o latitude, 44.4o longitude) on October, November, December 2018. The solar chimney performance is investigated by experimentally recording absorber plate and air temperatures and velocity of air. Results indicated that the using metal foam absorber plate lead to reducing the mean temperature of absorber plate by 6.7 °C as a result, the values of chimney outlet air temperature increased. The daily solar chimney efficiency enhanced by 58.7% and the useful energy received also increased. The existence of metal foam caused higher air velocity at the exit and increasing in the ventilation rate that the maximum ventilate rate obtained from the solar chimney is 5.96 1/hr for 27 m3 volume of room at solar irradiance of 730 W/m2 for chimney incline angle of 60o. The results of the experimental work show that the addition of metal foam to the solar chimney as an absorber plate is an efficient method to enhance the characteristics of heat transfer and the thermal performance of the solar chimney in the weather condition of Iraq.
Highlights
To minimize the buildings heat gain, decrease the electrical energy requirement by operating non-consuming systems for ventilation presented as solar chimney (Chaichan and Kazem, 2011)
The experimental studies are established for selected days in October, November and December 2018 to examine the thermal performance of the designed solar chimney and the impact of using metal foam for different inclination angles
The maximum value of absorber plate mean temperature temperature absorber plate (Tp)-with with metal foam and Tp-without for without metal foam are (69 and 75.9) oC at a tilted angle equal 60o. It clear that the temperature of metal foam absorber plate is lower when it compares to the temperature of absorber plate without metal foam
Summary
To minimize the buildings heat gain, decrease the electrical energy requirement by operating non-consuming systems for ventilation presented as solar chimney (Chaichan and Kazem, 2011). The solar chimney device that naturally ventilate the space that can enhancing the buildings energy efficiency Various investigation covers this domain experimentally, numerically and mathematically. A numerical and experimental study was presented by (Karima and Saif, 2012) to conduct solar chimney heat transfer enhancement in unsteady conditions with inserting phase change material. (Jianliu and Weihua, 2013) performed an experimental and numerical study to conduct the solar chimney behavior that inserted into one story building to specify the best inclination angle that gives maximum ventilation rate. The highest produced ventilate rate from the designed solar chimney was 30 ACH at 750 W/m2 solar irradiance for 60o incline angle with 0.8 m/s maximum velocity of air for 0.05 m air-gap thickness, no air-flow reverse was noticed in 0.15 m gap thickness. To the most useful of authors knowledge, the heat transfer improvement of solar chimney with the integrate of metal foam that investigated experimentally is not showed in the previous work, in Iraq
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