Abstract: A system (10) and a method for determining a maximum miming speed (MRS) of a runner include a memory unit (32) (MU) with miming determinants (30) (RDs) of the runner and venue stored therein. A processor unit (22) (PU), connected to the memory unit (32) (MU), runs a predictive algorithm (24) (PA) using the running 5 determinants (30) (RDs) to determine the maximum running speed of the runner by zeroing a linear momentum balance and an angular momentum balance of the runner, typically over at least a half-running cycle (HRC). An output unit (34) (OU), connected to the processor unit (22) (PU), receives the determined maximum running speed therefrom. The zeroing also allows the determination of a critical 10 ground impulse ratio (Rcr) of the runner.

Abstract: The present invention relates to a multi-modes heat exchanger and air ventilation system and method. The system's different modes are possible with the rotation of fan assemblies allowing airflow into specific ducts, thus acting both as fans and as valves. Each air handing unit is connected to a centralized network which allows the control of multiple units simultaneously in response to interior or exterior air characteristics.