Notes the difficulty of clearly visualising air currents, even with the use of tracer particles. Describes a system using the schlieren technique, a form of optical flow visualisation keyed to thermal differences in the flow which permits the clear visualisation of air currents. States that the direct observation of full-scale HVACR air flows by this technique has been shown to be feasible and useful. The key innovation is the use of a large grid and a small lens in place of former limiting optical elements. Provides some full- scale schlieren photographs of air flows in typical situations involving people and notes the new information they reveal. Concludes that a new tool is now available for full-scale ventilation and indoor air quality studies, validation of computational results and the diagnosis of air flows created by all types of HVACR equipment. Mentions work on developing portable equipment.
Citation: ASHRAE Journal, vol. 39, no. 7, July 1997
Product Details
- Published:
- 1997
- Number of Pages:
- 8
- File Size:
- 1 file , 330 KB
- Product Code(s):
- D-9172
