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Computational Fluid Dynamics (CFD) of indoor environment as well as quality considerations are important element in the study of energy consumption, thermal comfort and indoor air quality in buildings. This paper investigate a comparison work between impinging jet, displacement, and mixing ventilation systems for an isothermal and nonisothermal ventilated room for Indoor Air Quality (IAQ) and thermal human comfort under Iraqi climate. For IJV system, draught discomfort is the issue of most concern since it supplies cooled air directly to the occupied zone. This study investigated a number of factors influencing draught discomfort and temperature stratification in an office environment. The considered factors, supply airflow rate and supply air temperature. RNG K-Ɛ turbulence model was used with the turbulent flow. The second aspect included numerical analyses by adopting ANSYS FLUENT15 code to generate simulation models. A square shaped air supply device was used with [0.1 times room height (h)] outlet terminal height from the foot level end. The IJV system proved more efficient than displacement and mixing ventilation systems. The Air Distribution Performance Index (ADPI) obtained for an isothermal and non-isothermal ventilated room adopting IJV system gave best values (0.80, 0.83) respectively compared with the other two ventilation systems. KEYWORD: Impinging jet ventilation, mixing ventilation, displacement ventilation, comparison study, CFD, Indoor air quality, Numerical model, turbulence model. و تفرغلا ءاىه تيعىن ءاصقتسا ثاهىظنه ماذختساب نيلغاشلل تيرارحلا تحارلا تيقارعلا ءاىجلاا فورظ ذنع تفلتخه تيىهت .د سابع ذوحه ةراس يذهه سابع ءلاع تيكيناكيولا تسذنهلا نسق /تسذنهلا تيلك /لباب تعهاج تصلاخلا َهَىا غُضاىَىا ٍِ هىغشَىا سُحىا ءاىه تُػىّو تُيخاذىا تئُبىا ءبصقخسلا غئاىَىا لٍُبَْد ةبمبحٍ ًاذخخسا ربخؼَ ت ةىيسأ تُىبحىا تسارذىا ًذقح .تفرغىا ءاىه تُػىّو ُِيغبشيى تَرارحىا تحارىاو تقبطىا كلاهخسا ثبسارد ٍف بثَذح تقبطَىا ًبظّو , هُحازلاا تَىهخىا ًبظّ , رثؤَىا قثبىا تَىهح ًبظّ( ًاذخخسلاا تؼئبشىا تَىهخىا ثبٍىظٍْ ٍِ عاىّأ تثلاث ُِب هّربقٍ ٍ ُِػىْى )طيخخَىا تَىهخىا ذَذحخى بَرارح هىسؼٍ رُغ هفرغ تُّبثىاو بَرارح تىوسؼٍ هفرغ ًىولأا , تُبخنَىا فرغىا ِ غطقٍ ور ءاىه سُهجح يرجٍ جٍذخخسا رثؤَىا قثبىا ةىيسأب تَىهخىا تٍىظٍْ تفرغىا ءاىه تُػىّ ةبسح ذْػ وضفا ٌهَا سَ تفرغىا تُضرأ ِػ تفرغيى ءاىهىا سُهجح تحخف ذؼب ُبمو ونشىا غبرٍ ٍضرػ ٌوب (0.1h) ُا جئبخْىا ثرهظأ . رشؤٍ ةبسحو تَىهخىا ةءبفم ةبسح هلاخ ٍِ يرخلأا ثبٍىظَْىا ٍِ وضفأ رثؤَىا قثبىا ًبظّ ًاذخخسبب تَىهخىا ةىيسأ . ءاىهىا غَزىح ءادأ INVESTIGATING INDOOR AIR QUALITY AND THERMAL Ala'a A. Mahdi COMFORT USING DIFFERENT VENTILATION SYSTEMS Sara M. Abbas UNDER IRAQI CLIMATE

INVESTIGATING INDOOR AIR QUALITY AND THERMAL COMFORT USING DIFFERENT VENTILATION SYSTEMS UNDER IRAQI CLIMATE