Distributed Pumping takes energy savings to new heights at The Museum of Flight

The situation

The Museum of Flight in Seattle, WA, USA is the largest independent, non-profit air and space museum in the world and home to thousands of exhibits from the history of air and space flight.

The Museum of Flight had been running its original cooling equipment since its installation in 1987.

With the equipment aging and energy costs rising, it became increasingly apparent the Great Gallery’s cooling system was approaching the end of its life cycle. It suffered from poor Delta T, was poorly balanced and unable to reach the design temperature everywhere within the building – a critical factor when considering that maintaining ±2° from the set temperature is essential for the preservation of the historic aircraft.

The museum therefore decided to embark on a project of upgrading and retrofitting the gallery’s cooling system, emphasising the need for increasing the energy efficiency of all its components. 

The solution

As the museum’s engineers began investigating replacing the constant speed, chilled and condensing water pumps with high-efficiency, variable speed pumps, they became aware
of Grundfos Distributed Pumping— a solution that replaces large centralized pumps and traditional balancing and control valves with smaller, more intelligent pumps throughout the building delivering flow and pressure only when and where it’s needed, automatically balancing the system and significantly reducing energy consumption.

“It became readily apparent there was a real energy savings opportunity in Distributed Pumping, because you’d eliminate the designed-in friction and pressure drops that were necessary for our old control valves to have a good accurate control range,” explains Fenton Kraft, Engineering Services Manager at The Museum of Flight. “Those valves come with an energy penalty that is pretty significant, and the main system pumps that were previously installed and even any new pumps would have to overcome that kind of pressure drop. So as we looked at Distributed Pumping, it significantly reduced the valve-induced friction, pressure drop and the horsepower requirements needed to overcome those losses."

In collaboration with local sales partner Hurley Engineering, Bogard Pascua Engineers, and a team of Grundfos experts, an optimized Distributed Pumping system was designed with the following specification:

• 10°F chilled water Delta T
• 1 new water-cooled chiller
• 1 new cooling tower
  

The new chilled water system includes:

• Hydro MPC-E 2 CRE 125-1-1 (condenser water pump)
• Hydro MPC-E 2 CRE 95-1-1 (primary pump)
• 12 MAGNA3s (one distributed pump placed at each AHU, and two placed at the largest AHU)

“With Distributed Pumping, we remove traditional balancing and control valves,” describes Pavel Mirchev, Lead US Technical Engineer, Distributed Pumping. “Instead of having one pump that makes high pressure for the entire building, we have smaller primary pumps in the mechanical room, and we put a pump on every load that makes exactly the pressure and the flow that is needed. So in this way we put just the right amount of energy in the water, and we don’t need to waste it with valves.” 

The outcome

The cooling system at The Museum of Flight improved its performance significantly after the conversion to Grundfos Distributed Pumping. Optimal temperatures are achieved at all locations in the Great Gallery, which has reduced the cooling system’s operating hours.

For the entire 2023 cooling season (mid-April to mid-October), the new Distributed Pumping system resulted in 74% pump energy savings, equivalent to 34,000 kWh or $3,400. This does not take into account even further savings from the chiller and cooling tower energy reduction due to the increased efficiency of the new equipment, optimized operation and reduced working hours.

74% Pump Energy Savings

Grundfos supplied: 

the following equipment for the distributed pumping system:

• Hydro MPC-E 2 CRE 125-1-1 (condenser water pump)
• Hydro MPC-E 2 CRE 95-1-1 (primary pump)
• 12 MAGNA3s (one distributed pump placed at each AHU, and two placed at the largest AHU)