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EVALUATING THE INFLUENCE OF SOME DESIGN AND ENVIRONMENTAL PARAMETERS ON THE PERFORMANCE OF EARTH TO AIR HEAT EXCHANGER

Authors: Sajad Waleed Noori --- Mushtaq Ismael Hasan
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 2 (Part-1) Pages: 10-29
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The earth to air heat exchangers (EAHE) is effective passive cooling and heating techniques for buildings. This paper studies numerically the effect of some design and environmental parameters (moist content of soil, pipe material and thickness of pipe wall) on the overall performance of EAHE system. Three types of soil were selected (dry soil, moist soil and saturated soil) with two pipe materials PVC and steel and three thicknesses of pipe wall (2, 3 and 6 mm). This numerical study has been done for summer and winter seasons according to the weather conditions for Nasiriyah city in southern of Iraq. First the built numerical model was validated against experimental model and the results of comparison showed good agreement. After the validation the overall performance of EAHE system with selected parameters was analyzed with ranges of air velocity, inlet temperature and pipe length of 50 m. The simulated results showed that the very moist or saturated soil gives the best overall performance of EAHE system compare with other soils, Furthermore there is no significant effect of pipe material and wall thickness on the overall performance.


Article
Two Stage Evaporative Cooling of Residential Building Using Geothermal Energy
لتبريد التبخيري ذو المرحلتين لمبنى سكني باستخدام طاقة باطن الارض

Authors: Ali Hammoodi Mahdi Alhosainy --- Issam Mohammed Ali Aljubury
Journal: Journal of Engineering مجلة الهندسة ISSN: 17264073 25203339 Year: 2019 Volume: 25 Issue: 4 Pages: 29-44
Publisher: Baghdad University جامعة بغداد

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Abstract

The weather of Iraq has longer summer season compared with other countries. The ambient temperature during this season reaches over 50 OC which makes the evaporative cooling system suitable for this climate. In present work, the two-stage evaporative cooling system is studied. The first stage is indirect evaporative cooling (IEC) represented by two heat exchangers with the groundwater flow rate (5 L/min). The second stage is direct evaporative cooling (DEC) which represents three pads with groundwater flow rates of (4.5 L/min). The experimental work was conducted in July, August, September, and October in Baghdad. Results showed that overall evaporative efficiency of the system (two coils with three pads each pad of 3cm) reach to 167 % with the temperature difference between ambient and supply is 26.2oC. While it reached 122.7% (one coil with three pads ) with the temperature difference between ambient and supply is 16OC and reduced to 84.88% and 84.36% for IEC and DEC respectively.

يمتاز فصل الصيف في العراق بانه من اطول فصول السنة مقارنة مع البلدان الاخرى. حيث تصل درجة حرارة المحيط الخارجي الى اكثر من 50 درجة مئوية مما يجعل نظام التبريد التبخيري مناسب لمثل هذه المناخات. يتكون الجزء العملي من نظام التبريد التبخيري من مرحلتين. المرحلة الاولى تتكون من التبريد التبخيري الغير مباشر المتمثل بالمبادلات الحرارية وبمعدل تدفق مياه جوفية 5 لتر/دقيقة. أما المرحلة الثانية فانها تتألف من التبريد التبخيري المباشر المتمثل بحشوات كارتونية ذات سمك 3 سم مع معدل تدفق مياه جوفية (4.5) لتر/دقيقة. اجريت التجارب العملية في بغداد خلال شهر تموزو اب و ايلول وتشرين الاول. أظهرت النتائج ان كفاءة التبريد التبخيري لمرحلتين مبادلان حراريان مع ثلاثة حشوات (سمك كل حشوة 3سم) تصل الى 167% مع فرق درجات حرارة الهواء الخارجي والمجهز تصل الى 26.2 درجة سليزية . بينما تصل الى 122.7% بأستخدام (مبادل حراري واحد مع ثلاثه حشوات) مع فرق درجات حرارة الهواء الخارجي والمجهز تصل الى 16 درجه سليزية وتنخفض الى 84.88% و84.36% للتبريد التبخيري الغير مباشر والمباشر على التوالي.

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