This paper presents and compares the results of a test program to determine the systematic and random errors of airflow instrumentation used in field balancing. The random errors determined apply to the instrument and its application on various fittings. Five instruments were tested on five different ventilation system fittings.
Test results show that each type of fitting requires a laboratory-developed correction factor for use with each instrument, with the exception of the collector, which can utilize a single factor for diffusers. The largest corrections, or "K-factors," were required for the velometer and deflecting vane anemometers when used on diffusers. Test results with diffusers mounted on two different types of elbows showed no difference in the K-factor. All instruments demonstrated precision or random error of plus or minus 1 percent to plus or minus 5 1/2 percent of reading for 1 1/2 standard deviations.
Citation: Symposium, ASHRAE Transactions, 1984, vol. 90, pt. 2B, Kansas City, MO
Product Details
- Published:
- 1984
- Number of Pages:
- 18
- File Size:
- 1 file , 1.3 MB
- Product Code(s):
- D-KC-84-11-3
