A technique has been developed to estimate the equivalent leakage area needed in residences to provide a quantity of infiltration-driven air exchange which exceeds a design value for a desired level of frequency of occurrence. The technique presented applied an air infiltration simulation model to hourly long term weather data to provide hourly estimates of the infiltration weather factor. Cumulative frequency distributions (CFD) were then used to describe the distribution of these data when 1-, 3-, 6-, 8-,12-, 24-, and 48-hour time periods were grouped together.
A novel ventilation system has been installed in buildings constructed for the New Campus of the University of Nottingham. Super-efficient mechanical ventilation has been used as part of an integrated environmental strategy and operates with fan input powers below 0.5 W. l-1. s-1 of airflow. The complete plant was assembled from innovative low-pressure components and has exceptional performance. A key element of the design is that components of the system are bypassed when not in use. At the heart of the system is a low-velocity, high efficiency thermal wheel.
This paper presents an advancement in HVAC system analysis, which is predicated on the electrical analogy to fluid systems. An integrated description or a building's HVAC system and rooms is constructed and may be used to support system testing and balancing, system performance analysis, capacity verification testing, and room interactions. Additional system simulation is useful to assess plant modifications and their impact on HVAC performance. This method is applicable to any facility with a large or complex HVAC system configuration.
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