Infrared imaging results of an excited planar jet

Conference · Sun Dec 01 00:00:00 EST 1991

OSTI ID:5957552

Farrington, R B

Planar jets are used for many applications including heating, cooling, and ventilation. Generally such a jet is designed to provide good mixing within an enclosure. In building applications, the jet provides both thermal comfort and adequate indoor air quality. Increased mixing rates may lead to lower short-circuiting of conditioned air, elimination of dead zones within the occupied zone, reduced energy costs, increased occupant comfort, and higher indoor air quality. This paper discusses using an infrared imaging system to show the effect of excitation of a jet on the spread angle and on the jet mixing efficiency. Infrared imaging captures a large number of data points in real time (over 50,000 data points per image) providing significant advantages over single-point measurements. We used a screen mesh with a time constant of approximately 0.3 seconds as a target for the infrared camera to detect temperature variations in the jet. The infrared images show increased jet spread due to excitation of the jet. Digital data reduction and analysis show change in jet isotherms and quantify the increased mixing caused by excitation. 17 refs., 20 figs.

• Research Organization: National Renewable Energy Lab., Golden, CO (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-83CH10093
• OSTI ID: 5957552
• Report Number(s): NREL/TP-254-4515; CONF-920436-11; ON: DE92001185
• Resource Relation: Conference: 1992 ASME-JSES-KSES international solar energy conference, Maui, HI (United States), 4-8 Apr 1992
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
47 OTHER INSTRUMENTATION
JETS
AIR FLOW
IMAGES
TEMPERATURE DISTRIBUTION
AIR QUALITY
EFFICIENCY
INFRARED RADIATION
MIXING
PERFORMANCE TESTING
VENTILATION SYSTEMS
ELECTROMAGNETIC RADIATION
ENVIRONMENTAL QUALITY
FLUID FLOW
GAS FLOW
RADIATIONS
TESTING
320106* - Energy Conservation
Consumption
& Utilization- Building Equipment- (1987-)
440500 - Thermal Instrumentation- (1990-)