ANSI/ASHRAE 118.1-2012
The purpose of this standard is to provide test procedures for rating directly heated commercial service water heating equipment. Changes to the 2008 version include:updated referencesrevisions of Type IV and Type V definitionsrevised test methods and performance calculationsa new Appendix B4 to include heat transfer calculations for direct geoexchange and water-source heat-pump water heatersa new Appendix B5 to establish test conditions for all heat-pump water heaters. Keywords: Geothermal heat pump, Geothermal, Direct Expansion, Ground Source, DGX, DX, GSHP, Direct Geoexchange, Geoexchange