This document begins with a history of the development of variable speed technology, explaining the efficiency improvements associated with each development step. Also presented is an exclamation of the value and importance of best efficiency staging of pumps, followed by a description and explanation of the value of partial redundancy as a more cost-effective and efficient alternative to the traditional duty/standby configuration for pumps.
It’s hardly surprising that hvac system designs have evolved in the last 65 years. The surprising aspect is the number of new and recent installations that rely on old, outdated designs. Look back through your most recent projects. The pumps and related components might be new, but the design might be behind the times.
Here’s a look at the recent history of developments in hvac pumping configurations.