Abstract:
In this research performance investigation of solar ejector cooling system has been carried out in
on-design and off-design operating conditions and enhancement of the ejector is studied. Addis
Ababa is taken as a case study area and important data were gathered from the Ethiopian National
Meteorology Agency (ENMA) of six consecutive years (2013-18). Hourly and monthly
performance analysis of the system is carried out at on-design and it showed a good result. The
hourly maximum overall coefficient of the performance and the cooling capacity were obtained as
0.2049 and 186.9 W/m2
, respectively, at 12:00 in March when the design points are (𝑇𝑔 = 90OC,
𝑇𝐶 = 30OC and 𝑇𝑒= 12OC). The collector area per ton cooling capacity is found to be 22.3 m2
at
noon for all cooling seasons in Addis Ababa. Off design operating condition map is derived for
the system. The results are compared to related researches which is done previously in other
countries and it showed good agreement. It was determined that the Solar ejector cooling system
could be used for office-cooling purposes during the hours (8:00โ15:00) in Addis Ababa/ Ethiopia.
The optimum dimension of Ejector is obtained using one-dimensional hung et al. theory with the
help of flowchart with cooperation to EES code. Constant-pressure type ejector with steady state
three-dimensional model has been carried out for the ejector (with and without mixer) numerical
study in ANSYS 16.0 FLUENT. R-134a is the working fluid which is selected for the study and
considered as an ideal gas. The results are compared between with and without mixer ejector.
The performance of ejector is improved by 10.4 % and the mixing quality also enhanced
