From: Stumpf, Andrew J
Sent: Friday, March 1, 2019 4:20 PM
To: Erickson, Keith R; White, Morgan
Subject: Geothermal project at the Woody Perennial Polyculture site for new greenhouse and existing Greenhouse 1506 Building

Hi Keith,

In getting an initial estimate for the design and build of a geothermal system for a new and existing greenhouse at the Woody Perennial Polyculture site we are being asked to what extent the electrical system will need to be modified/upgraded. Does it require utilizing the existing infrastructure and extending the current line to an utility shed, or will there be further modifications needed to the electrical system.

We have been advised so a far that the heated greenhouse would need up to 5 heat pumps, which would be located in the shed. Another heat pump would be installed in Greenhouse 1506 building, to be used just for summer cooling. Overall, the proposed geothermal borefield would provide 2-tons of heating and cooling.

Currently, both greenhouse have propane heaters, and the 1506 building has a evaporative cooler on the west wall. Since we could not get a design and build of the geothermal system done in the summer/fall, Dr. DoKyoung Lee installed the propane heater that came with the new greenhouse he purchased in early last year. We introduced the idea of building the geothermal system after he had purchased the greenhouse.

If you could provide us with some information about the electrical distribution system at the site, we would appreciate it.

Thanks,

Andy

Andrew Stumpf, Ph.D, LG, P.Geo

Associate Geologist

Illinois State Geological Survey

Prairie Research Institute

University of Illinois at Urbana-Champaign