Back in June, I had the opportunity to attend the Armstrong Global Energy Summit in Toronto.  I must say I was skeptical about the whole thing including the possibility of a new technology better than variable frequency drives. I couldn’t be more wrong! Armstrong has developed this amazing technology with full integration of the VFD and the Pump being now one thing. The possibilities are huge, and they are aiming high when it comes to energy savings (according to them up to 80%) and installation savings up to 65%.

Here is some more information I gather from their website. I encourage you to read and contact them for a possible retrofit of your system.

Through design advances,

Armstrong has eliminated the cost trade-offs that are frequently attached to sustainable choices. Design Envelope offers the lowest installed cost and the lowest life cost of any pumping solution today.

Design Envelope solutions reduce pumping costs through variable speed, demand-based operation — consuming only the energy required, based on current system demand.

Design Envelope pumps use a combination of optimized impeller size and speed control for energy efficient operation within a given perfor­mance envelope. The performance envelopes are selected for the best pump efficiency where vari­able flow systems operate most often. This ensures a building’s pumping system consumes as little energy as possible. It also ensures that the instal­lation meets or exceeds ashrae 90.1 guidelines requiring 70% energy savings at 50% of peak load.

Armstrong Design Envelope variable speed technology fundamentally changes the operation of a pump within the larger hvac system. The variable speed intel­ligence embedded in the Armstrong Design Envelope controller adjusts the pump operation to meet the immediate demand. The pump responds instan­taneously and draws only the power required to meet that demand.

In a chilled water system, a building’s temperature controls influence the local flow of control valves that modulate the flow to the cooling coils (load). As the control valves open for more chilled water flow, the differ­ential pressure across the valve decreases. The controller reacts to this change by increas­ing the pump speed. If the control valves close to reduce the chilled water flow, the differential pres­sure across the valve increases and the controller reduces the pump speed.

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