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Case Studies: Alliant Energy General Office


Alliant Energy General Office – Dubuque, Iowa

20,000-square-foot downtown office building.

Geothermal heat pump system:

56-ton system with WaterFurnace and ClimateMaster heat pumps.

Geothermal loop system:

  • Open loop to Alfa Laval plate heat exchanger with one 10-horsepower pump.
  • Two 7.5-horsepower alternated closed loop pumps.

At a glance:

  • All pumps are controlled by variable speed drives.
  • Internal loop temperatures are held at 50-65 degrees Fahrenheit.
  • Two fresh-air units utilize closed loop coolant to temper incoming air.
  • Electric backup used in extreme winter conditions.
  • Mississippi River water in aquifer layer filtered via a 14-inch diameter, 20-foot-long stainless steel microscreen.

General design:

Shive-Hattery – Cedar Rapids, Iowa

Mechanical contracting:

Giese Sheet Metal – Dubuque, Iowa