Anbar Journal of Engineering Sciences

Reducing energy consumption and to ensure thermal comfort are two important
considerations in designing an air conditioning system. The control strategy proposed is fuzzy
logic controller (FLC).This paper describes the development of an algorithm for air condition
control system based on fuzzy logic (FL) to provide the conditions necessary for comfort
living inside a building.Simulation of the controlling air conditioning system, on which the
strategy is adopted, was carried out based on MATLAB This system consists of two sensors
for feedback control: one to monitor temperature and another one to monitor humidity. The
controller i.e. FLC was developed to control the compressor motor speed and fan speed in
order to maintain the room temperature at or close to the setpoint temperature.

Temperature distribution through asphalt and the underlying layer have been obtained
numerically using finite element method where a varying induced heat from sun and
environment cause fluctuating temperature distribution throughout .The maximum effect of
these parameters on the temperature of the asphalt is expected in summer, so the
temperature distribution was studied in the summer only. Some interesting results were
found ; at tropical zone such as in Baghdad the asphalt surface temperature may reach (70 C
) and it is reduced with depth .Due to fluctuating environment heat effect, the subsequent
temperature of the asphalt and the underlying layer may fluctuating with some delay and
damping depending on the layers thermal properties , these result may be used later to
predict both the erosion rate of car tiers and asphalt thickness, also the preserved energy
using asphalt layer may be used to confined heat for further usage as in electrical generation.

In this research we have prepared a composite material by using Vegetative Cellulose Fibers
of Cannabis (Cann F) to reinforced a matrix of Unsaturated Polyester (UP) resin. This kind of
fibers is distinguished by good properties such as high tensile strength, low elongation, thermal
resistance and low cost.
The impact strength was tested by using Charpy method for three materials (UP resin),
composite (UP / Cann F) and composite (UP/Glass F).
The results indicated that the fracture energy (Uc) decreased as the notch depth (a) increased
on the sample from (0.7 mm) up to (4.9 mm). However, the fracture energy increased as the
temperature of the composite increased for different temperatures of (0, 35, 50 and 75) oC. It was
noticed that the Material toughness (Gc) has been improved significantly, where in case of the
composite (UP /Cann F), the improvement of (Gc) was from (2.45 kJ/m2 ) to (14.5 kJ/m2 ) and it
was (17 kJ/m2 ) for composite (UP/GF) has been measured at (35) oC. When those composite
materials (UP/Cann F) exposed to humidity for a period of (72 hrs) without immersion, their
properties did not change, hence the effects are not of chemical but of physical nature.
The conclusion, the difference between the toughness of the material (Gc) for the reinforced
composites by Cannabis and E-glass fibers for all temperatures is not large, so this encourage the
development of Cannabis fiber reinforced composites in the future to abundance, and low cost for
industrial investment

The main objective of this paper is to create a method for designing and studying the
performance of a multistage axial flow compressor. A mathematical methodology based on
aerothermodynamics is used to study the on /off design performance of the compressor.
Performance curves are obtained by changing the performance parameters in terms of design
parameters (diffusion factor, solidity, Mach number, and inlet flow angle). Results show the
great effect of diffusion factor on increasing efficiency than that of solidity, also the effect of
both (diffusion factor and solidity) in increasing the amount of compression and efficiency of
the compressor. Higher efficiency was found at the mean line between the root and tip of the
blade. Best lift to drag ratio is found at inlet flow angle of (55o).

This work aims to increase the availability of steam generation plant through modifying
boiler maintenance plan by determining the optimum period of time between maintenances to
achieve maximum availability via simulation approach.
Applying simulation approach is an attempt to determine the optimum period of time between
schedule maintenances to achieve maximum boiler availability. Therefore, PC program in visual
basic language is designed as a tool to the implementation of availability simulation approach.
It notes that the boiler availability is increased by (6.9%) in changing the optimum time between
scheduled maintenances and inspection to be seven months rather than one year.

In this study the effect of sodium hydroxide on the strength of clayey soil-cement
mixtures was investigated. Clay soils from three various locations of Kirkuk governorate
namely Erbil, Laylan and Hawija check points were used.
The effect of cement content, curing age, curing temperature and concentration of sodium
hydroxide on the strength of soil-cement mixtures were investigated, through carrying out
unconfined compressive strength, Triaxial compression and C.B.R tests.
It was found that the use of sodium hydroxide markedly improves the strength of soil-cement
mixtures. The addition of about 1% of sodium hydroxide by weight of soil could reduce
about 5% of cement content by weight of soil required to stabilize the soils effectively.

This paper is aimed to study the effect of SiC addition as reinforcement to 6061
T6 alloy. Al 6061 T6 alloy SiC composites were prepared by melting the alloy in a
vortex and adding 4 % and 10% weight fractions of SiC. Then pouring the mixture
into a mould to obtain a bar of 12 mm diameter and 150 mm length. Wear
specimens were manufactured in dimensions of 20mm x 10mm according to ASTM
to the base alloy and the cast matrix alloy. Microstructure have been carried out to
understand the nature of structure and Hardness test also implemented to specimens.
Adhesive wear test have been conduct both on the alloy and composites at different
parameters (time, load and velocity).
From the obtained results, it was found that wear resistance improved during the
carbide addition comparing with the base alloy as a result of SiC addition which
contributed in improving the hardness of the alloy that reflects to the wear resistance
and these properties were improved as the increasing of the carbide silicon
percentage.