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In my opinion, for 90.1-2010 appendix G, the baseline systems are created for each "thermal block" a term that is defined in the standard which references another defined term "zone, HVAC" which is about a "a space or group of spaces within a building..." so if your radiant system is not within the building than you cannot define a baseline system for it. For anything in a building model that does not have specific rules in Appendix G, the baseline and proposed models should be identical and so no credit or deduction should be made related to the radiant system not within the building. On the other hand, if the radiant system is within the building and used as all of or part of the conditioning for a thermal block, than the normal rules apply and one of the 10 baseline systems would be chosen which would replace the radiant system. Please note that this is just my opinion as an individual and is NOT an ASHRAE official interpretation.

In my opinion, for 90.1-2010 appendix G, the baseline systems are created for each "thermal block" a term that is defined in the standard which references another defined term "zone, HVAC" which is about a "a space or group of spaces within a building..." so if your radiant system is not within the building than you cannot define a baseline system for it. For anything in a building model that does not have specific rules in Appendix G, the baseline and proposed models should be identical and so no credit or deduction should be made related to the radiant system not within the building. On the other hand, if the radiant system is within the building and used as all of or part of the conditioning for a thermal block, than the normal rules apply and one of the 10 baseline systems would be chosen which would replace the radiant system. Please note that this is just my opinion as an individual and is NOT NOT an ASHRAE official interpretation. interpretation.