Thermal Loads and Cost Reduction for a Residential House by Change Its Orientation and Add Roof Shading
الشريط الجانبي للمقالة
محتوى المقالة الرئيسي
الملخص
The Iraqi climate is characterized by high temperatures in summer that require a
large capacity of air conditioning systems to meet the suitable climate conditions
which they are appropriate for the comfortable conditions for human especially
housing units. The demerits of these systems are the high-maintenance-cost as well
as high electrical power consumption, whereas the last considers currently one of
the major obstacles in Iraq. This research studies the influence of two significant
factors to reduce the thermal loads of the building which leads to decrease the
consumption of the energy. The Study of the effect for the building's direction to
the falling angle of the sunlight during the daylight in addition to the probability of
reducing the thermal load of the building, and studying the effect of shading the
buildings' roofs with red tile to prevent the falling sunlight on the roofs using the
design method cooling load temperature difference (Cooling Load Temperature
Difference –CLTD-) to calculate the thermal loads of a building designed
according to the modern Iraqi design Located in Baghdad. The results explained a
decrease in the thermal load through external walls by (12.32%) when directing the
building to the direction West (W) compared to the South-West (SW) trend, while
the thermal load through the glass decreased by 24.9% when directing the building
to the North (N )direction with a trend of South-West (SW) as well as a decrease
of 8.5% for the total thermal load of the building when directing the building to the
direction North (N) compared to other trends and when shading the roof with a
material preventing the sun reduces the rate of thermal load of the roof by 55%
compared to the exposed roof. The study also shows in terms of the costs per
building provides about (108787 ID / Day) of the supported governmental costs
whereas the non-governmental cost is about (55987 ID / Day).
المقاييس
تفاصيل المقالة
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فهرست للرموز
m2
A المساحة العمودية على الطاقة المنتقلة
CLF معامل حمل التبريد للزجاج
CLTD فارق درجات الحرارة لحمل التبريد )° C)
Dr معدل التغيير اليومي لدرجة الحرارة الخارجية °C
K الموصلية الحرارية للمواد الصلبة ((C.°m/(W)
LM تصحيح خط العرض والطول للمدينة
q معدل الحرارة )Watt )
)C⁄watt °( الحرارية المقاومة R_th
SC معامل التظليل للزجاج
)Watt/m2
SHG الكسب الحراري الشمسي خالل الزجاج (C.°
الرئيسية االربعة اإلتجاهات S,E,N and W
T درجة الحرارة ° C
)Watt/m2
U معامل الحرارة اإلجمالي (C.°
X سمك طبقة الجدار m
الرموز الجانبية
m معدل القيمة
o الخارجي
i الداخلي
r الغرفة