This paper deals with the description and determination of the purging flow rate, UP for ventilation systems or equivalent flow systems. The regional purging flow rate and its use are discussed and proposed. By using the mass conservation principle, UP is embodied in various accessible mathematical expressions in terms of the transfer probability. Some UP-related parameters are described. A Markov chain model is proposed for determining the transfer probability and exploring several useful ventilation indices.
The largest-ever exercise to validate dynamic thermal simulation programs (DSPs) of buildings has recently been completed. It involved 25 program/user combinations from Europe, the USA and Australia, and included both commercial and public domain programs. Predictions were produced for three single-zone test rooms in the UK. These had either a single-glazed or double-glazed south-facing window, or no window at all. In one 10-day period the rooms were intermittently heated and in another 10-day period they were unheated.
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