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Hybrid Geothermal Heat Pump System Research Geothermal Project
Geothermal/AwardeeCostShare 55,605  +
Geothermal/AwardeeWebsite  +
Geothermal/Awardees Energy Center of Wisconsin  +
Geothermal/DOEFundingLevel 190,395  +
Geothermal/FundingOpportunityAnnouncemt DE-FOA-0000116  +
Geothermal/FundingSource American Recovery and Reinvestment Act of 2009  +
Geothermal/Impacts Will encourage much more widespread adoption of GHPs in the US, including hybrids, which incorporate cooling towers/boilers to minimize loop size/cost and yet offer practical GHP performance.  +
Geothermal/LocationOfProject Madison, WI +
Geothermal/Objectives Build on previous research experience in hybrid ground-source heat pump (HyGSHP) systems.  +
Geothermal/OtherPrincipalInvestigator Scott Hackel, Scott Pigg, Lee DeBaillie, Keith Swartz and Dan Cautley from the Energy Center of Wisconsin, and Dr. Sanford Klein and Dr. Gregory Nellis from the UW SEL  +
Geothermal/Partner1 University of Wisconsin Solar Energy Lab  +
Geothermal/Partner1Website  +
Geothermal/ProjectDesc Geothermal, or ground-source heat pump sys
Geothermal, or ground-source heat pump systems have been shown to have superior energy performance to conventional heating and cooling systems in many building types and climates. There has been significant growth in the application of these systems; yet, geothermal systems have only been able to capture a few percent of the heating and cooling market. This is due primarily to the prohibitively high cost of installing the necessary ground loop. Hybrid ground-source heat pump (HyGSHP) systems are an innovation that has the potential to dramatically decrease this high first cost. HyGSHPs connect conventional ground-source heat pump (GSHP) equipment with supplemental devices such as cooling towers (in a hot climate) or boilers (in a cold climate). This innovation allows for the installation of a significantly smaller ground loop while maintaining high system efficiency during most of the operating hours. The installation of smaller ground loops lowers first costs and lowers life cycle costs in many scenarios. While HyGSHPs do not always lead to lower energy use than traditional GSHPs, these economic benefits could allow HyGSHP technology to significantly increase the market share of geothermal systems in general, increasing their overall energy saving potential. However, hybrid systems are complex to design and control, and there is limited information and research dedicated to the topic. Therefore, HyGSHPs are almost never considered for building projects. Recent research through ASHRAE and other groups has led to some basic design guidelines, conclusions and preliminary software tools to help designers and operators understand these systems. This research includes work by both the principal investigator, the Energy Center of Wisconsin (the Energy Center) and the sub-awardee, University of Wisconsin Solar Energy Lab (UW SEL) of this proposal. A modeling tool was developed—HyGCHP (for ‘hybrid ground-coupled heat pump’)—that can be used both to study the performance of and optimize designs for HyGSHP systems. But there are additional key objectives not reached by this research, and hybrid systems remain a challenging option to most building designers.
lenging option to most building designers.  +
Geothermal/ProjectTypeTopic1 Recovery Act – Geothermal Technologies Program: Ground Source Heat Pumps  +
Geothermal/ProjectTypeTopic2 Topic Area 2: Data Gathering and Analysis  +
Geothermal/TargetsMilestones - Utilize performance data from actual HyG
- Utilize performance data from actual HyGSHP systems to validate the existing ‘HyGCHP model’; determine accuracy of HyGCHP model and improve if necessary. <br />- Refine and enhance the HyGCHP model to: a) create more direct interaction between the model and building energy modeling tools, b) improve the general usability of the model, and c) expand the capability of the model to include at least one other hybrid configuration. <br />- Demonstrate cost savings, overall performance, and calculated life cycle costs of the actual systems; use building models to compare these results to conventional and GSHP systems. <br />- Report to the building design community: focus on design lessons learned (including the availability of modeling tools) and economic advantages and/or disadvantages of HyGSHPs.
dvantages and/or disadvantages of HyGSHPs.  +
Geothermal/TotalProjectCost 246,000  +
Name Hybrid Geothermal Heat Pump System Research  +
Place Wisconsin: Energy Resources +
Has query
"Has query" is a predefined property that represents meta information (in form of a subobject) about individual queries and is provided by Semantic MediaWiki.
Hybrid Geothermal Heat Pump System Research Geothermal Project +
Categories Geothermal ARRA Funded Projects , Geothermal ARRA Projects
Modification date
"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by Semantic MediaWiki.
18:28:09, 22 July 2011  +
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