ASHRAE RP-1674

Abstract

Scope: Preface Geothermal Heating and Cooling is a complete revision of the 1997 ASHRAE publication Ground Source Heat Pumps: Design of Geothermal Systems for Commercial and Institutional Buildings. The primary audience includes HVAC design engineers, designbuild contractors, GSHP subcontractors, and energy/construction managers of building owners. A unique feature of interest for building owners and architects is that the book provides characteristics of quality engineering firms and information that should be provided by design firms competing for GSHP projects. This new work takes advantage of the many lessons learned since the time of the original publication, when GSHPs were primarily residential applications. Many improvements have evolved, and performance data, both positive and negative, is available to guide the development of best practices. Information was gathered from ASHRAE and GSHP-industry research and development projects, measured data from long-term installations, and optimized installation practices used by high-production GSHP contractors. As part of the revision, new research was conducted in critical areas not adequately addressed in previous projects. Seven of the original eight chapters and appendices were completely rewritten and include coverage of closed-loop ground (ground-coupled), groundwater, and surfacewater systems, as well as GSHP equipment and piping. Additional information on site characterization has been added, including a new hydrogeological chapter. The final chapter was replaced and contains results of recent field studies, energy and demand characteristics, and updated information to optimize GSHP system cost. Substantial effort was taken to develop tables, graphs, and equations in both Inch- Pound (I-P) and International System (SI) units, though there are a few instances where content is supplied in I-P units only. Appendix A provides a screenshot of UnitsConverter. xlsx that is useful for manual conversion of units from I-P to SI and vice versa, and Appendix B offers a list of references to publications and standards with information on procedures and specifications that are specific to the GSHP industry. In addition, this book is accompanied by Microsoft® Excel® macro-enabled spreadsheets, which can be found at www.ashrae.org/GSHP. The spreadsheet tools include UnitsConverter.xlsx, HVACSystemEff.xlsx, BoreResistance.xlsm, E-PipeAlator14.xlsm, WAHPCorrector14.xlsm, GroundTemp&Resist.xlsm, and Heat Exchanger Temperature Prediction. These files can be used for a variety of GSHP calculations. If the files or information at the link are not accessible, please contact the publisher.