Air Leakage Measurement of Buildings by an Infrasonic Method.

摘要

Excessive air leakage in buildings wastes heating and cooling energy. As an alternative to the blower method for measuring the composite effective size of all the air-leakage passages of a building or part of a building,the authors used an infrasonic method to yield the same flow-versus-pressure difference information. Sinusoidably varying volumetric flows between 0.05and 5Hz are generated by a motor-driven bellows-like source located inside the building under test. The resulting pressure variations are measured using a microphone-like sensor having an electronic signal processor. An important advantage of the infrasonic system is that no through-the-wall vents or pressure taps are required. One house,five apartments,and three interior rooms have been tested to date. Infrasonic and blower test results usually agree within a factor of three,but improved apparatus is expected to improve the agreement in the future.