UT CS 372 - LECTURE NOTES (19 pages)

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LECTURE NOTES



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LECTURE NOTES

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Lecture Notes


Pages:
19
School:
University of Texas at Austin
Course:
Cs 372 - Introduction to Operating Systems
Introduction to Operating Systems Documents

Unformatted text preview:

Lecture Objectives Finish Thermal Comfort and Air Quality analyses in CFD Start particle modeling Thermal comfort Temperature and relative humidity Thermal comfort Velocity Can create draft Draft is related to air temperature air velocity and turbulence intensity Thermal comfort Mean radiant temperature potential problems Asymmetry Warm ceiling Cool wall Cool ceiling Warm wall Prediction of thermal comfort Predicted Mean Vote PMV PMV 3 2 1 0 1 2 3 hot warm slightly warm neutral slightly cool cool cold PMV 0 303 exp 0 036 M 0 028 L L Thermal load on the body Empirical correlations Ole Fanger L Internal heat production heat loss to the actual environment L M W Csk Rsk Esk Cres Eres Predicted Percentage Dissatisfied PPD PPD 100 95 exp 0 03353 PMV4 0 2179 PMV2 IAQ parameters Number of ACH quantitative indicator ACH for total air for fresh air Ventilation effectiveness qualitative indicator takes into account air distribution in the space Exposure qualitative indicator takes into account air distribution and source position and intensity IAQ parameters Age of air air change effectiveness EV Specific Contaminant Concentration contaminant removal effectiveness Single value IAQ indicators Ev and 1 Contaminant removal effectiveness Ce concentration at exhaust average contaminant concentration C Contamination level 2 Air change efficiency v n Ev 2 Air freshness shortest time for replacing the air average of local values of age of air n 1 ACS sec Air change efficiency v Depends only on airflow pattern in a room We need to calculate age of air 2 2 2 Vx Vy Vz t 2 t 2 t 2 x y z x y z Average time of exchange exe 2 n 1 ACH sec What is the age of air at the exhaust Type of flow Perfect mixing Piston unidirectional flow Flow with stagnation and short circuiting flow Air exchange efficiency for characteristic room ventilation flow types Flow pattern Air change Comparison with average efficiency time of exchange 1 2 n exc 2 n Perfect mixing 1 exc n Short Circuiting 0 1 exc n



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