December 27, 2006


The primary purpose of this field test was to characterize the uniformity of room-to-room ventilation air distribution under various operating conditions by examining multi-zone tracer gas decay curves and calculating local age-of-air. The tests were conducted in two Sacramento houses, and were designed to allow direct, quantitative comparisons of various ventilation approaches, which could potentially be factored into ventilation rate trade-offs in future updates to ASHRAE Standard 62.2. Analysis of the measured data showed that reciprocal age-of-air analysis worked well to characterize room-to-room uniformity of ventilation air distribution as long as the house was well mixed at the beginning of the test, and weather conditions were sufficiently steady-state.