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All; I am using IES to demonstrate a performance based approach to Title 24 an altered retail facility. The space itself is 1 story below grade and 2 above. The structure is existing and has existing, conditioned buildings on both sides [for all floors] and above. Additionally, there are conditioned spaced to the front and rear of the below grade story. The space types for this below grade area are predominately offices. The HVAC system will be a VAV Reheat with hydronic heat, dual max thermostat. There are two VAV boxes serving zones in the basement/below grade floor. For these basement zones the model is giving an error regarding the a large number of unmet heating hours in the basement. Even after drastically upsizing these boxes [5 and 6x larger both air flow and heat coil capacity], the main fan and the heating system; the error existing with but a small dent in the unmet hours total.

My only thought is that possibly the adjacent buildings are causing some large, phantom heating load to drive this. The adjacent buildings are set up as 'excluded from model square-footage' and as unconditioned. Can anyone confirm this approach or provide some insight into the reason that these two zones would be having such massive heating issues? Is the model letting these adjacent buildings 'float' with outside air temperatures? IS there a way to condition these buildings to reflect what should be minimal heat loss, but not account for the energy to maintain this [since it is not our space and will not be conditioned by our equipment]? Please let me know if I have omitted s/t critical and thanks in advance for the assistance.

All; I am using IES to demonstrate a performance based approach to Title 24 an altered retail facility. The space itself is 1 story below grade and 2 above. The structure is existing and has existing, conditioned buildings on both sides [for all floors] and above. Additionally, there are conditioned spaced to the front and rear of the below grade story. The space types for this below grade area are predominately offices. The HVAC system will be a VAV Reheat with hydronic heat, dual max thermostat. There are two VAV boxes serving zones in the basement/below grade floor. For these basement zones the model is giving an error regarding the a large number of unmet heating hours in the basement. Even after drastically upsizing these boxes [5 and 6x larger both air flow and heat coil capacity], the main fan and the heating system; the error existing with but a small dent in the unmet hours total.

My only thought is that possibly the adjacent buildings are causing some large, phantom heating load to drive this. The adjacent buildings are set up as 'excluded from model square-footage' and as unconditioned. Can anyone confirm this approach or provide some insight into the reason that these two zones would be having such massive heating issues? Is the model letting these adjacent buildings 'float' with outside air temperatures? IS there a way to condition these buildings to reflect what should be minimal heat loss, but not account for the energy to maintain this [since it is not our space and will not be conditioned by our equipment]? Please let me know if I have omitted s/t critical and thanks in advance for the assistance.

All; I am using IES to demonstrate a performance based approach to Title 24 an altered retail facility. The space itself is 1 story below grade and 2 above. The structure is existing and has existing, conditioned buildings on both sides [for all floors] and above. Additionally, there are conditioned spaced to the front and rear of the below grade story. The space types for this below grade area are predominately offices. The HVAC system will be a VAV Reheat with hydronic heat, dual max thermostat. There are two VAV boxes serving zones in the basement/below grade floor. For these basement zones the model is giving an error regarding the a large number of unmet heating hours in the basement. Even after drastically upsizing these boxes [5 and 6x larger both air flow and heat coil capacity], the main fan and the heating system; the error existing with but a small dent in the unmet hours total.

My only thought is that possibly the adjacent buildings are causing some large, phantom heating load to drive this. The adjacent buildings are set up as 'excluded from model square-footage' and as unconditioned. Can anyone confirm this approach or provide some insight into the reason that these two zones would be having such massive heating issues? Is the model letting these adjacent buildings 'float' with outside air temperatures? IS there a way to condition these buildings to reflect what should be minimal heat loss, but not account for the energy to maintain this [since it is not our space and will not be conditioned by our equipment]? Please let me know if I have omitted s/t critical and thanks in advance for the assistance.