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||Demonstration and Performance Monitoring of Foundation Heat Exchangers (FHX) in Ultra-High Energy Efficient Research Homes|
Im, Piljae [ORNL]
Hughes, Patrick [ORNL]
Liu, Xiaobing [ORNL]
|Publication Date:||2012 Jan 01|
|OSTI Identifier:||OSTI 1050928|
|DOE Contract Number:||DE-AC05-00OR22725|
|Resource Relation:||Conference: ACEEESummer Study on Energy Efficiency in Buildings, Pacific Grove, CA, USA, 20120812, 20120817|
|Research Org:||Oak Ridge National Laboratory (ORNL)|
|Subject:||15 GEOTHERMAL ENERGY; BASEMENTS; CONSTRUCTION; DESIGN; DRILLING; ENERGY EFFICIENCY; EXCAVATION; GROUND SOURCE HEAT PUMPS; HEAT EXCHANGERS; HEAT TRANSFER; MONITORING; PERFORMANCE; WATER; WATER SUPPLY|
|Description/Abstract:||The more widespread use of Ground Source Heat Pump (GSHP) systems has been hindered by their high first cost, which is mainly driven by the cost of the drilling and excavation for installation of ground heat exchangers (GHXs). A new foundation heat exchanger (FHX) technology was proposed to reduce first cost by placing the heat exchanger into the excavations made during the course of construction (e.g., the overcut for the basement and/or foundation and run-outs for water supply and the septic field). Since they reduce or eliminate the need for additional drilling or excavation, foundation heat exchangers have the potential to significantly reduce or eliminate the first cost premium associated with GSHPs. Since December 2009, this FHX technology has been demonstrated in two ultra-high energy efficient new research houses in the Tennessee Valley, and the performance data has been closely monitored as well. This paper introduces the FHX technology with the design, construction and demonstration of the FHX and presents performance monitoring results of the FHX after one year of monitoring. The performance monitoring includes hourly maximum and minimum entering water temperature (EWT) in the FHX compared with the typical design range, temperature difference (i.e., T) across the FHX, and hourly heat transfer rate to/from the surrounding soil.|
|Country of Publication:||US|
|System Entry Date:||2014 Jun 24|
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