Building Simulation

, Volume 11, Issue 1, pp 51–66 | Cite as

Development of a ground-coupled heat pump system simulation model using g-function approximation for a residential code-compliant tool

Research Article Building Systems and Components


This study develops a ground-coupled heat pump (GCHP) simulation model for a residential code-compliant simulation tool. To achieve this, this study proposed the g-function approximation method using polynomial curve-fitting equations. In addition, the residential air-source heat pump (ASHP) simulation model (i.e., RESYS in DOE-2.1e) was modified to include a vertical ground heat exchanger module. To check validity of the new GCHP system model, this study compared the simulation results against the results from the other simulation tools. The results between the programs showed good agreement within 5.3% differences for the annual total site energy use. Using the developed GCHP simulation model, the energy savings for a code-compliant residential building in Houston and Dallas were evaluated in comparison with the ASHP system, and the resultant annual energy savings were about 10% to 15% in the total site energy use and 30% to 40% in the heating plus cooling energy use.


ground source heat pump vertical ground heat exchanger g-function approximation residential building energy simulation International Energy Conservation Code 


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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Department of Building and Plant EngineeringHanbat National UniversityDaejeonR.O. Korea
  2. 2.Department of ArchitectureTexas A&M UniversityCollege StationUSA

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