Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


Saba Zakeri Shahvari MSc. Thesis.pdf (1.13 MB)

ETD Abstract Container

Abstract Header

Assessment and improvement of the 2019 ASHRAE Handbook model for exhaust-to-intake dilution calculations for rooftop exhaust systems (ASHRAE 1823-RP)

Zakeri Shahvari, Saba
http://orcid.org/0000-0002-2911-9334
http://rave.ohiolink.edu/etdc/view?acc_num=osu1575921032418665

Abstract Details

2020, Master of Science, Ohio State University, Mechanical Engineering.
The HVAC Applications volume of the 2019 ASHRAE Handbook: Chapter 46 gives multiple procedures for sizing building exhaust stacks and fans. The most complex of these procedures directly calculates dilution at a receptor of interest using plume theory and several empirical constants. There is suggestion in the literature that this model leads to overly conservative dilution predictions in some cases. The purpose of this work is to determine whether the ASHRAE model can be improved to give more accurate dilution predictions. First, the predictions of the existing equation are evaluated against several existing wind tunnel and full-scale studies and their shortcomings noted. The results show that the 2019 model under-predicts observed dilution mainly in two cases: near the stack and when the plume was within the assumed recirculation region. The assumptions for initial plume spread, height of recirculation zone region, plume spread and plume trajectory were varied parametrically to identify a better model. This optimized model can increase dilution predictions by factors between 2 and 500, while bounding measured data in all cases analyzed. This can reduce the required momentum ratio by 20-70%, leading to much more efficient fan sizing and operation.
Jordan Clark (Advisor)
Andy May (Committee Member)
65 p.
Mechanical Engineering
dispersion modeling, exhaust stacks, building air intakes, plume modeling, laboratory ventilation, hospital ventilation, vivariums

Recommended Citations

Citations

  • Zakeri Shahvari, S. (2020). Assessment and improvement of the 2019 ASHRAE Handbook model for exhaust-to-intake dilution calculations for rooftop exhaust systems (ASHRAE 1823-RP) [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1575921032418665

    APA Style (7th edition)

  • Zakeri Shahvari, Saba. Assessment and improvement of the 2019 ASHRAE Handbook model for exhaust-to-intake dilution calculations for rooftop exhaust systems (ASHRAE 1823-RP). 2020. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1575921032418665.

    MLA Style (8th edition)

  • Zakeri Shahvari, Saba. "Assessment and improvement of the 2019 ASHRAE Handbook model for exhaust-to-intake dilution calculations for rooftop exhaust systems (ASHRAE 1823-RP)." Master's thesis, Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1575921032418665

    Chicago Manual of Style (17th edition)

osu1575921032418665
485
© 2020, some rights reserved.Creative Commons License Assessment and improvement of the 2019 ASHRAE Handbook model for exhaust-to-intake dilution calculations for rooftop exhaust systems (ASHRAE 1823-RP) by Saba Zakeri Shahvari is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by The Ohio State University and OhioLINK.