The key design factor in a VAV system is the control of. the supplied air. The terminal unit should be sized to. take advantage of as much of its potential capacity as. possible. Without this fundamental consideration, the. customer has not received the best value for their VAV. system design.
The amperage rating on the DC motor is not the amperage the treadmill will be using from your wall outlet. Most treadmills only need 10-12 amps from the wall (or less), so a 15 amp circuit is fine, regardless of the rating on the motor. Just look at the amperage rating on the treadmill to see what your wall outlet needs to supply. #2 see #1. #3 Current is always lost in the form of heat when used to power a device. Be it in the motor, the electronics or even the line supplying the current.
A motorized treadmill is usually used to increase the intensity of exercise until fatigue occurs. The amount of oxygen consumed just before exhaustion is the maximal oxygen uptake or VO2max. Exercise intensity can be expressed as a percentage of VO2max. Low intensity such as fast walking would be 30 to 50% of VO2max. Jogging can demand 50 to 80 % of VO2max depending on the intensity, and sprints can require from 85% to 150% of VO2max (with the added 50% coming from short term anaerobic energy production).