Analytical versus wind tunnel determined concentrations due to laboratory exhaust

Conference · Sat Dec 31 23:00:00 EST 1988 · ASHRAE Transactions (American Society of Heating, Refrigerating and Air-Conditioning Engineers); (USA)

OSTI ID:5783007

Peterson, R L ^[1]; Wilson, D J ^[2]

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1. Cermak Peterka Petersen Inc., Fort Collins, CO (US)
2. Dept. of Mechanical Engineering, Univ. of Alberta, Edmonton (CA)

This paper presents a determination of the expected concentrations for an actual building using the analytical and wind-tunnel modeling procedures presented in Chapter 14 of ASHRAE Fundamentals. A comparison of the estimated concentrations using the two methods is presented as well as a description of the calculation methodologies. The results of the comparison showed that for a low exit velocity stack with a small exit diameter and zero stack height, the wind tunnel and analytical estimates compare within a factor of two to six, with the ASHRAE estimates tending to be conservative. For a high exit velocity stack with a large diameter and zero stack height, the wind tunnel intake dilutions were generally an order of magnitude greater than those obtained using the analytical equations. The paper provides further evidence that the equations in Chapter 14 do provide conservative estimates of the expected dilution for laboratory stacks, even for he non-idealized building shape considered. However, the estimates may be overly conservative and may result in added design expense (unnecessarily tall stacks or emission control devices). If a designer wishes to optimize the stack design with respect to cost, aesthetics, and safety, the added accuracy provided by the wind tunnel may be necessary.

• OSTI ID: 5783007
• Report Number(s): CONF-890609--
• Journal Information: ASHRAE Transactions (American Society of Heating, Refrigerating and Air-Conditioning Engineers); (USA), Journal Name: ASHRAE Transactions (American Society of Heating, Refrigerating and Air-Conditioning Engineers); (USA) Vol. 95, Part 2; ISSN ASHTA; ISSN 0001-2505
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320107* -- Energy Conservation
Consumption
& Utilization-- Building Systems-- (1987-)
BUILDINGS
DILUTION
EXHAUST SYSTEMS
MANAGEMENT
STACK DISPOSAL
STACKS
STANDARDS
TESTING
TUNNELS
UNDERGROUND FACILITIES
WASTE DISPOSAL
WASTE MANAGEMENT
WIND TUNNELS