The major energy saving with induction systems is in fan power. What is the situation with pumping energy?
There is an increase in total pump energy as a result of the secondary water system. The primary water flow to air handlers is reduced, and the primary water pump energy is reduced accordingly. However, while the total pump energy for induction systems, primary and secondary, is higher than an all-air system, it does not significantly reduce the energy savings achieved by the reduction in the fan power. As with any exercise in comparing energy usage between competing systems, each installation must be looked at separately, and the savings of each assessed and considered against the other factors of cost, ongoing maintenance and ease of installation.
