05.2021.420.432

Performance of A New Model of Air Heating System: Experimental Investigation

Author(s):

Hassanain Ghani Hameed†*, Hayder Azeez Neamah Diabil, Muntadher Mohammed Ali Saeed

Affiliation(s):

Engineering Technical College / Najaf, Al-Furat Al-Awsat Technical University, 31001 Najaf, Iraq

Mechanical Dept., Engineering College, Kufa University, Najaf, Iraq

Corresponding Author Email: hayder.duaybil@uokufa.edu.iq

 

This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

In the current paper, a new design for an air solar heater is tested and its results are compared with the corresponding results of a conventional air solar heater (two-pass black flat plate). Experimental measurements have been performed under Najaf city/Iraq (latitude and longitude are 32º 03 N and 44º 19 E) prevailing weather conditions. The new design is a longitudinal aluminum radiator placed inside a fully isolated bed. The radiator is covered with black paint to increase the heat absorption of the solar radiation and then distribute it regularly to the passing air. In addition to test the activity of the new system, the current experiments shed a light on influence of the air mass flow rate on the air outlet temperature, thermal efficiency and pressure drop. Three air mass flow rates are selected: 0.0046, 0.0092 and 0.0138 kg/s. The results show that increasing in the air mass flow rate leads to decrease in the air outlet temperature and increase of the pressure drop and thermal efficiency for both current solar collectors. Moreover, the radiator air solar heater is 18.62% more efficient at the maximum point compared to the conventional one with 0.0138 kg/s leading to obtain 32.66% as the maximum enhancement in the thermal efficiency.