GeoExchange on a Campus Scale
In the summer of 2009, the design of the largest geoexchange project in the nation began at Ball State University. Phase 1 of the project has been operational since November of 2011 and operational data is being collected. The project will achieve significant energy savings and reduce the campus carbon footprint by converting the campus HVAC system from coal-fired steam boilers to geoexchange for both heating and cooling. When complete, the system will supply 152 MMBH of heat and 10,000 tons of chiller capacity to the entire campus. The project includes 3,600 – 400 feet deep wells, new District Energy Station North, upgrading the existing CHW distribution system, new hot water distribution system, and building conversions from steam to hot water heating. Using this project as a back drop, the presentation will address the following steps and considerations when designing this type of system: Master planning a geothermal campus conversion Development of campus thermal profiles Properly sizing the well-field Utility distribution systems Building conversion strategies
1. Participants will discuss esign considerations as well as challenges when designing a geoexchange system on a campus scale amd the factors leading to the correct sizing of the well field.
2. Participatns will gain a better understanding of the impact of campus thermal load characteristics on the thermal performance of the heat pumps and the well field as well as how to prepare for the potential conversion of a campus system.
3. Participants will explore ways to think differently about the design of building heating systems to ensure equipment loadind and how to build conversion considerations.
Michael Luster, MEP Associates, Inc.