Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Test

Solar Photovoltaic Direct-Driven Air Conditioning System Performance in Iraq

Hashim A. Hussein; Ali H. Numan; Krar M. Kuder

Engineering and Technology Journal, 2020, Volume 38, Issue 7, Pages 984-991
DOI: 10.30684/etj.v38i7A.477

The present research paper is on photovoltaic air conditioning system using the direct drive method. The experimental system setup arranged in Iraq at Al-taje site at longitude 44.34 and latitude 33.432 during the summer season inside a room. The proposed off-grid system consists of an array of photovoltaic, battery used to store power, PWM (pulse width modulation) charge controller, and DC air cooler. During the examination of the system, proven success of this new type(dc air conditioner ) of client urges Iraq warm conditions as an alternative type used instead of the prevailing types of air conditioners (AC air conditioner )in Iraq which consume large amounts of electrical energy and gets a cooling system for the room full working on solar energy.

Testing of the Effect Drying the Marshes on the Climate Elements in South Iraq

Wafaa Sayyid Hasanain; Ali Rahim Tuema; Samer Kasim Mohammed

Engineering and Technology Journal, 2016, Volume 34, Issue 2, Pages 11-25
DOI: 10.30684/etj.34.2B.19

This research aims to test and analyze the impact of the process of drying the marshes in the cities of Basra , Amara and Nasiriya on the climate elements (maximum temperature , minimum temperature , average temperature , relative humidity , wind speed , rainfall and atmospheric pressure) statistical analysis using the t-test statistical that based on the Statistical Package (SPSS), by comparing and analyzing the difference between the climate elements averages during the two periods (1981 – 1991) and (1992 - 2002) , and the impact of that process on the climate elements.
The results showed the negative impact of the drying process on climate elements of the three cities cannot be attributed to chance.

Improving a Model for Speed / Density Relationship on Arterial Roads in Baghdad City

Abeer Khudher Jameel

Engineering and Technology Journal, 2011, Volume 29, Issue 3, Pages 625-638

This paper was undertaken to investigate the relationships between speed
and density on urban arterial roads of Baghdad City. This research work was based
on the traffic survey data (PC volume and average speed) collected in Palestine
Street in 3 sections at two directions through 12 hours within 3 weekdays. The
density is computed using fundamental formula of traffic flow. Eight theoretical
Speed-Density models (5 are single Regime Models and 3 are Multi-Regime
models) are validated by the field data by two statistical test methods (CHISQ test
and Paired T-test). The results show that no one of the theoretical models is good
in fit with the real data. Then a Multi-Regime Model is improved under two ranges
of density (<70 and >70) at south approach and (<60 and >60) at north appraoch .
This model is tested using regression analysis, CHISQ test, and Paired T-test. This
analysis shows that the model has good fit with the field data.