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Soil temperature profile and its readiness for controlling buildings indoors Temperature at Erbil city – Iraqi Kurdistan Region (IKR)
مقد درجة حرارة التربة وامكانية استخدامها للسيطرة على درجة الحرارة داخل الابنية فى مدينة اربيل اقليم كردستان العراق

Authors: Tariq H.Karim طارق حمه كريم --- Sirwan Ali Rasha سيروان علي ره شه
Journal: Sulaimania Journal for Engineering Sciences مجلة السليمانية للعلوم الهندسية ISSN: 24101699/24156655 Year: 2014 Volume: 1 Issue: 1 Pages: 29-41
Publisher: university of Sulaimania جامعة السليمانية

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Abstract

Soil temperature varies both diurnally and seasonally and can determine the temperature gradient within the collector loops of the ground source heat pump. To study spatial and temporal variations of soil temperature besides investigating the possibility of using underground soil temperature of the region for the installation of ground heat exchange systems, the current study was conducted. Soil temperature was measured at two locations in Erbil city/ IKR during the period from November, 1st, 2012 to February, 28th, 2013 with temperature sensors inserted in the ground at different depths. . It has been observed that during January and February the soil temperature offered the highest and lowest fluctuations respectively and they were closely related to ambient air temperature. The results also indicated that soil temperature increased with increasing depth up to a depth of 3.5 m in most cases and thereafter started to decrease with increasing depth. Furthermore, it was shown that the reliability of soil temperature prediction from air temperature decreased with the increase in soil depth. Positive differences at a depth of 3.5 m February ranged from 13.73 to 21.56 oC during the winter season from December to. The results can be valuable in planning for preheating system during the cold seasons.

تخضع درجة حرارة التربة للتغيرات اليومية والموسميةوهى تحدد الانحدار الحرارى ضمن حلقات انظمة التدفئة. من اجل دراسة التباين الزمانى والحيزى لحرارة التربة فضلا عن امكانية استخدام حرارة باطن الارض لاغراض التدفئة قيست درجة حرارة التربة فى موقعين داخل مدينة اربيل/اقليم كردستان العراق ضمن الفترة المحصورة ما بين شهرى تشرين الثانى 2102 وشباط 2102 باستخدام مجسات حرارية منصوبة على اعماق مختلفة. لوحظ اعلى واقل تذبذب لحرارةالتربة خلال شهرى كانون الثانى وشباط على التوالى واستجاب التذبذب الحرارى الى تذبذب حرارة الهواء بصورة وثيقة. كما اشارت النتائج الى ازدياد حررارة التربرة مرع ازديرادالعمق الى حد 2.3 م وبعدها بدأت بالانخفاض، و عرلاوة علرى ذلك لوحظ بأن دقة التنبؤ بحرارة التربة من حرارة الهواء تقرل بأزدياد العمق. كما وان وجود فروقات معنويرة موجبرة برين حرارة التربة وحرارة الهواء فى المدى ما بين 02.32 و 20.32 م 1 عنررد العمررق 2.3 م خلال شهرى كانون الاول وكانون الثانى قد تساعد فى استخدام حرارة باطن الارض لاستخدام التدفئة خلال المواسم الباردة.


Article
Application of Earth Tube Heat Exchanger and Solar Chimney for Natural Cooling System in Basrah City

Authors: Salman H. Hammadi --- Alaa Hlaichi Mohammed
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2014 Volume: 14 Issue: 2 Pages: 23-32
Publisher: Basrah University جامعة البصرة

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Abstract

Solar chimney (SC) together with earth to air heat exchanger (EAHE) is being employed as a low-energy consuming technique to remove undesirable interior heat from a building in the hot seasons. A numerical program "FLUENT 6.3 code" of an earth to air heat exchanger (EAHE) is studied for predicting the outlet air temperature and cooling potential of these devices in Basrah climate. Theoretical analyses have been conducted in order to investigate the ventilation in a solar chimney. The investigation into the viability of Low Energy Earth Pipe Cooling Technology in providing thermal comfort in Basrah. The demand for air-conditioning in buildings in Basrah affects the country escalating energy consumption. Therefore, this investigation was intended to seek for an alternative passive cooling to air-conditioning. The passive technology, where the ground was used as a heat sink to produce cooler air, has not been investigated systematically in hot and humid countries. A sub-soil temperature model adapted for the specific conditions in Basrah is presented and its output compared with CFD modeling. The results have shown that the potential of Earth Pipe is providing lower output temperature of air inlet to the room. We found that the resulting temperature at the buried pipe outlet decreases with increasing pipe length, decreasing pipe diameter, decreasing mass flow rate of flowing air in the pipe and increasing depths up to 4m.

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