IMPACT OF DUCT LEAKAGE PRESSURES ON THE SHAPE OF THE DELTA Q CURVE.

ANDREWS,J.W.

Brookhaven National Laboratory

关键词: Pressure Dependence;    Signal-To-Noise Ratio;    Ducts;    Leak Testing;    Q-Value;   

DOI  :  10.2172/793051
RP-ID  :  BNL--69049
RP-ID  :  AC02-98CH10886
RP-ID  :  793051

美国|英语

来源: UNT Digital Library

【 摘 要 】

The question of whether and to what extent information on the pressures driving duct leaks can be extracted from the data taken during the Delta Q test for duct leakage is investigated. Curves of Delta Q vs. house pressure are generated for sets of cases where the supply and return leakage rates to/from outside are held constant while the leakage pressures are varied. It is found that the Delta Q curve takes on two qualitatively different shapes, one for leakage pressures within the range of house pressures used in the Delta Q test (i.e., -25 Pa to +25 Pa) and the other for leakage pressures well outside this range. These effects are seen in experimental data taken with leakage at known pressures. However, extracting the signal of the leakage pressure from the surrounding noise caused by random measurement variation is likely to be a difficult problem in many cases.