Where a zone is without any form of fixed conditioning equipment, but at least 50% of the surroundingenvelope area including party walls, party floors and party ceilings is adjacent to directlyconditioned space, (or for party envelopes is assumed to be adjacent to conditioned space), then it will beassumed to be indirectly conditioned.
The zone will be assigned the same HVAC as the adjacent spaces, or the larger proportion of adjacentspaces unless there is significant air transfer with a specific adjacent zone, for example through a frequentlyused doorway.
The energy assessor should provide suitable evidence to show that there is no fixed / direct conditioning equipment within the zone and that at least 50% of the surrounding area is conditioned, i.e. a floor planand/or photos of the unconditioned zone.
A zone which has no fixed conditioning equipment but is being treated as “conditioned adjoining space” byapplying assumed heating following convention 6.11 and appendix 10.07 IS considered to be directlyconditioned and does contribute to indirectly conditioning any adjacent zone.
Mike Gordon
Comments