SavedAdd your journal

Journals / Çukurova Üniversitesi Mühendislik-Mimarlik Fakültesi Dergisi / 2019 / Cilt: 34 - Sayı: 3

Numerical Determination of Comfort Level (PMV/PPD) in an Office Model with Jet Nozzle

Jet Lüle ile İklimlendirmesi Yapılan Bir Ofis Modelinde Konfor Seviyesinin (PMV/PPD) Sayısal Olarak Belirlenmesi

Alper YILDIRIM
COŞKUN ÖZALP
Pages
207–217
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

The areas of thermal satisfaction and dissatisfaction in the room were determined with PMV PPD contours

📌 3 Key Takeaways

🎯
Objective & Hypothesis:In this study, the air is blown to an office room which has dimensions 3 x 4 x 3,5 m by a jet nozzle.
📊
Key Findings & Data:Office room includes a human, a refrigerator, a light and a computer, The office conditions were assumed to be in summer in Osmaniye province and the heat loss gain was calculated by considering 100% fresh air flow rate and blowing temperature were found according to this evaluation,.
💡
Conclusion & Impact:The areas of thermal satisfaction and dissatisfaction in the room were determined with PMV PPD contours
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

In this study, the air is blown to an office room which has dimensions 3 x 4 x 3,5 m by a jet nozzle. Office room includes a human, a refrigerator, a light and a computer, The office conditions were assumed to be in summer in Osmaniye province and the heat loss gain was calculated by considering 100% fresh air flow rate and blowing temperature were found according to this evaluation,. Heat flux is given to the all office walls with heat loss and gain calculation. The velocity and temperature distribution of the jet nozzle are simulated with the ANSYS-FLUENT program. The conservation of mass, the conservation of turbulent momentum, the kinetic energy of the turbulence (k), and the velocity of propagation (ɛ) of the kinetic energy of the turbulence equations are used. The Predicted Mean Vote (PMV) and Predicted Percentage Dissatisfied (PPD) values at 0.1, 0.6, and 1.1 meters above the ground level of office were calculated from these values. The areas of thermal satisfaction and dissatisfaction in the room were determined with PMV PPD contours

Özet

Bu çalışmada, içerisinde insan, buzdolabı, lamba ve bilgisayar bulunan ve boyutları 3 x 4 x 3,5 m olan bir ofise jet lüle ile üfleme yapılmıştır. Ofisin Osmaniye ilinde yaz şartlarında olduğu varsayılmış ve içerisine %100 taze hava verildiği düşünülerek ısı kaybı kazancı hesabı yapılmıştır. Bu hesaba göre debi ve üfleme sıcaklığı bulunmuştur. Duvarlara, tabana, tavana ısı kaybı ve kazancı hesabına göre ısı akısı verilmiştir. Ayrıca; insan, dolap, lamba ve bilgisayara ısı akısı verilmiştir. Ofise yerleştirilen jet lülenin hız ve sıcaklık dağılımı ANSYS-FLUENT programı ile sayısal olarak elde edilmiştir. Sayısal hesaplamada sürekli koşullarda; kütlenin korunumu, türbülanslı momentumun korunumu, türbülans kinetik enerjisi (k) ve türbülans kinetik enerjisinin yayınım hızı (ɛ) denklemleri kullanılmıştır. Buradan elde edilen değerler ile zeminden 0,1, 0,6, 1,1 metre yüksekliğinde Isıl çevreden memnuniyet (Predicted Mean Vote-PMV) ve Isıl Çevreden Memnuniyetsizlik (Predicted Percentage Dissatisfied-PPD) değerleri hesaplanmıştır. Oluşturulan PMV ve PPD konturlarında jet lüle ile üfleme yapılan oda içerisindeki termal memnuniyet ve memnuniyetsizlik alanları tespit edilmiştir.

🔖

Cite This Article

YILDIRIM, A., ÖZALP, C. (2019). Numerical Determination of Comfort Level (PMV/PPD) in an Office Model with Jet Nozzle. Çukurova Üniversitesi Mühendislik-Mimarlik Fakültesi Dergisi, Cilt: 34 - Sayı: 3, 207–217. https://ajindex.com/articles/153180

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (11)

  1. https://www.designingbuildings.co.uk/wiki/Th ermal_comfort_in_buildings Mihliyanlar, H., Kartal, S., Erten, Ş.Y., 2017. Yükseköğretim Yapılarında Isıl Konfor Şartlarının Araştırılması;Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 21(3), 917-927.
  2. ASHRAE, ANSI/ASHRAE Standard 55, 2013. Thermal Environmental Conditions for Human Occupancy, American Society of Heating, Ventilating and Air-conditioning Engineers, Atlanta. ISO Standard 7730, 2005. Ergonomics of the Thermal Environment-analytical Determination and Interpretation of Thermal Comfort Using Calculation of the PMV and PPD Indicesand Local Thermal Comfort Criteria, International Organisation for Standardisation, Genova Parsons, K., Human, 2002. Thermal Environments, the Effects of Hot Moderate and Cold Environments on Human Health, Comfort, and Performance, Third Edition,
  3. CRC Press, Taylor&Francis Group. 257-268.
  4. He, G., Yang, X., Srebric, J., 2005. Removal of Contaminants Released from Room Surfaces by Displacement and Mixing Ventilation: Modeling and Validation. Indoor Air. 15, 367-380.
  5. Budaiwi, I., Abdou, A., 2013. HVAC System Operational Strategies for Reduced Energy Consumption in Buildings within Termitten Occupancy: the Case of Mosques. Energy Conversion and Management. 73, 37-50.
  6. Schiavon, S., Melikov, A.K., Sekhar, C., 2010. Energy Analysis of the Personalized Ventilation System in Hot and Humid Climates. Energy and Buildings, 42, 699-707.
  7. Fong, M., Hanby, V., Greenough, R., Lin, Z., Cheng, Y., 2015. Acceptance of Thermal Conditions and Energy Use of Three Ventilation Strategies with Six Exhaust Configurations for the Classroom. Building and Environment, 94, 606-619.
  8. Salvalai, G., Pfafferott, J., Sesana, M.M., 2013. Assessing Energy and Thermal Comfort of Different Low-energy Cooling Concepts for Non-residential Buildings, Energy Conversion and Management, 76, 332-341.
  9. Wong, L., Mui, K., 2009. An Energy Performance Assessment for Indoor Environmental Quality (IEQ) Acceptance in Air-conditioned Offices. Energy Conversion and Management, 50, 1362-1367.
  10. Kharseh, M., Altorkmany, L., Al-Khawaj, M., Hassani, F., 2014. Warming Impact on Energy Use of HVAC System in Buildings of Different Thermal Qualities and in Different Climates. Energy Conversion and Management, 81, 106-111.
  11. Ahmed, A.Q., Gao, S., 2015. Thermal Comfortand Energy Saving Evaluation of a Combined System in an Office Room Using Displacement Ventilation, World Academy of Science, Engineering and Technology International