The use of double glass has spread largely to achieve thermal isolation and reduce the
consumption of energy in refrigerating in summer or heating in winter.
The manufacture of double glass has entered in Syria, and become very important
necessity
for achieving gain in consumption of energy, and specially in the drying process
of its before joining tow glasses together and making double panes.
The researcher has prepared mathematical model for heating exchanger which is used in
drying of panes by using Matlab program, and by this pattern the researcher has studied the
effect of different factors on design of the heating exchanger for finding the optimal design
which ensure reducing in using the energy in the drying process.
A computational model of the fatigue crack initiation period on the helical gears
,with consideration of the heat treatment by carburization and friction effects, is presented.
In order to calculate the number of stress cycles required for the appe
arance of the initial
cracks, and study the influence of dynamic behavior. For this end, a dynamic model of gear
with two freedom degrees in torsion developed in Matlab and fatigue criteria are used. The
computational results are compared with those obtained using strain- life method. The
obtained results show that appearance of initial fatigue crack depends strongly on the
friction coefficient between the surfaces, heat treatment, and on the dynamic load.
This research aims to study the effect of adding alloying elements and heat treatment
of Zinc metal on solar energy absorbing , nine alloys ingots were manufactured by
changing the percentages of added Aluminum and Copper on the pure Zinc, and thes
e
ratios of Aluminum were : (10% , 20% , 30% , 40 % , 50%) to demonstrate the effect of
adding Aluminum to Zinc metal on solar energy absorbing , and ratios of copper were :
(20% , 40%) , as well as we prepare two pure zinc samples with 99.2% of purity , one
was rapidly cooled and the other slowly cooled , to demonstrate the effect of heat treatment
on solar energy absorbing .
In order to measure the solar energy absorbing for prepared samples , we
manufactured a device depends on the methods of heat exchange between solar radiation
and the surface exposed to radiation .
The obtained results showed that adding Aluminum and Copper to the pure Zinc
caused a decrease in solar energy absorbing .
As well as increasing the percentages of adding Aluminum and Copper to the pure
Zinc caused a gradually decrease in solar energy absorbing .
comparing the absorbing of pure zinc samples, one was rapidly cooled and the other
slowly cooled , the results showed that the sample was rapidly cooled was better than the
sample slowly cooled on solar energy absorbing .
In this research, specimens of aluminum alloy 6061 were
received, and chemical composition was investigated. After
that solution heat treatment was applied on it at 530°C, a
section of these specimens was quenched in water and anther
quenched in
oil, and two sections were aged at 160°C for
times (1,3,5 h), and thus obtained six samples differ in
condition of heat treatment in addition to as received
specimen.
This research aims to study the reduction of air heaters corrosion in
steam boilers and increasing their efficiency , by the application of
combined heating of air by steam and exhaust gases.
The experimental data of this research demonstrates tha
theater
corrosion could bereduced by maintaining the exhaust gases
temperature above the dew point of sulfuric acid depending onthe
amount of sulphur in the fuel oil ,by controlling air heat temperature
by steam.Which increases the boiler efficiency as a consequence of
reducing the fuel consumption by 9% as a maximum , reduces heat
loss, minimizes maintenance costs and reduces the time of emergency
shutdowns.
This research was done by using a mathematical modeling for a heat storage tank by
the preparation a mathematical function using MATLAB software for charging and discharging
phase of the storage tank . it was applied partial storage strategy on a d
efault
building located in the city of Palmyra in the Syrian desert. peak cooling load (420 kW)
and storing (1420 kw-h) within a storage tank size of "30m3" So that the store of ice at
night and melting using outer fusion technology (External Melt) in thermal and electrical
peak hours in the next day .
The results showed the feasibility of a thermal modeling of the tank to cover the
air-conditioning load cooling load required ,the results also showed the shift of part of the
electrical daily load of the chiller about (576 Kw-h) with a clear reduction of mechanical
and electrical equipment with the provision of using electrical energy to a summer season
about (1376 kW-h/Season) and improving the daily electrical factor (DLF) achieves stability
of the electric system.
This paper presents the results can be generalized to large projects in the tropics
help in thermal and power consumption peak shift.
A new system was designed in portable plants-eater to improve the performance and
productivity and for using it in the harsh environment containing like-cane dense brushes
with high efficiency, quality and lowest power requirement and to harvest so
me crops are
grown in small areas. The new system includes three types: link chain, straight blades
chain and oblique blades chain, each chain is fixed on central aluminum disk. the three
chains were tested on tensile, the results were satisfactory. The cutters was tested in the
field on four types of stalk Wheat, Yellow Maize, Sorghum Helpenese and imperata
cylindrical. Cutting force, productivity, fuel consumption, power requirement was
calculated with deferent rotation speeds. The straight blades chain has the best cutting
quality and lowest energy requirement on maize and sorghum halepense, the oblique
blades chain was better on wheat and imperata cylindrical. The greatest values of energy
requirement and cutting forces appeared with link chain cutter-head. In general, these
cutter-heads are useable in weed-eater with higher efficiency than the old designs.
the leishmaniasis is a serious health problem in Syria, due to the
wide spreading of Leishmania Tropica parasite , the hardness of
controlling the reservoirs of parasites, and there is no specific ,safe
active therapy. A Heat shock protein 20 HSP2
0 belongs to the
small HSP (sHSP) family.
In this study، a traditional air source heat pump was modified by adding secondary
evaporator within hot water tank which acted as a water heat source of the heat pump. We
made the heat pump to run alternatively either using surrounding air heat or
water heat
gained from solar power.
We have done experiments during five months starting in December of 2014 until
April 2015. Temperature and pressure were measured at specific points of the cycle. Then
we defined the enthalpy at each point for both cycles using EES software (which is a
software to simulate thermodynamic elements)، and calculated the amounts of heat gained
in the evaporator، heat charged from the condenser، compressor work، coefficient of
performance ، and electrical power consumed by the compressor.
Then we made a compare between the two cycles and found that the improvement
ratio in of the modified cycle to the traditional cycle was 77.07%، and the reduction
ratio in electrical power consumed by the compressor of the modified cycle was 33.54%.
In line quenching and tempering has allowed ASCO (Arabian Steel Company) to
have higher ductility bar at higher strength levels compared with classic rebar production
with substantial reduction in alloy consumption by using heat treatment (thermex)
during
production proses on production line.
QTB (Quenching Tempering Bars) is an alternate means of strengthening long bars
by quenching the bars with water and then allowing the bars to self-tempering and
hardened case, the process is performed in line with the rolling process, after the
finishingarea. The process is stable and controlled, and it's effective on hardness and
strength properties on reinforced steel bars
The research has concentrate on Thermex and Thermex elements in finishing area of
rolling process.
