HVAC Distribution

In HPXML multiple HVACDistribution elements can be associated with a heating or cooling system. For the purposes of this translator, it is required that only one HVACDistribution element be linked. That element can then describe a ducted system, a hydronic system, or an open ended other system. For the translation to HEScore, only HVACDistribution elements that are ducted are considered.

Duct Location Mapping

For each Ducts element in each air distribution system, the location of the duct mapped from HPXML enumerations to HEScore enumerations according to the following mapping.

Duct Location mapping (HPXML v2)
HPXML HEScore
conditioned space cond_space
unconditioned space not translated
unconditioned basement uncond_basement
unvented crawlspace unvented_crawl
vented crawlspace vented_crawl
crawlspace not translated
unconditioned attic uncond_attic
interstitial space not translated
garage vented_crawl
outside not translated
Duct Location mapping (HPXML v3)
HPXML HEScore Hierarchy
living space cond_space
unconditioned space uncond_basement, vented_crawl, unvented_crawl, uncond_attic
under slab vented_crawl
basement uncond_basement, cond_space
basement - unconditioned uncond_basement
basement - conditioned cond_space
crawlspace - unvented unvented_crawl
crawlspace - vented vented_crawl
crawlspace - unconditioned vented_crawl, unvented_crawl
crawlspace - conditioned cond_space
crawlspace vented_crawl, unvented_crawl, cond_space
exterior wall not translated
attic uncond_attic, cond_space
attic - unconditioned uncond_attic
attic - conditioned cond_space
attic - unvented uncond_attic
attic - vented uncond_attic
interstitial space not translated
garage vented_crawl
garage - conditioned cond_space
garage - unconditioned vented_crawl
roof deck vented_crawl
outside vented_crawl

Warning

If an HPXML duct location maps to not translated above, the translation for the house will fail.

Duct Fractions

For each Ducts element in an air distribution system the FracDuctArea is summed by HEScore duct location.

Duct Insulation

If the any of the Ducts elements in a particular location have a DuctInsulationRValue or DuctInsulationThickness that is greater than zero or have a DuctInsulationMaterial that is not None, all of the ducts in that location are considered insulated.

Duct Sealing

Duct leakage measurements are not stored on the individual Ducts elements in HEScore, which means they are not directly associated with a duct location. They are instead associated with an AirDistribution element, which can have many ducts in many locations. Duct sealing information is therefore associated with all ducts in an AirDistribution element.

To specify that the ducts in an AirDistribution system are sealed, the translator expects to find either of the following elements:

  • DuctLeakageMeasurement/LeakinessObservedVisualInspection element with the value of “connections sealed w mastic”.
  • HVACDistribution/HVACDistributionImprovement/DuctSystemSealed element with the value of “true”.

The DuctLeakageMeasurement can hold values for actual measurements of leakage, but since HEScore cannot do anything with them, they will be ignored. Therefore the following will result in an “unsealed” designation:

<DuctLeakageMeasurement>
   <DuctType>supply</DuctType>
   <!-- All of this is ignored -->
   <DuctLeakageTestMethod>duct leakage tester</DuctLeakageTestMethod>
   <DuctLeakage>
       <Units>CFM25</Units>
       <Value>0.000000001</Value><!-- exceptionally low leakage -->
   </DuctLeakage>
</DuctLeakageMeasurement>

and the following will result in a “sealed” designation:

<DuctLeakageMeasurement>
   <DuctType>supply</DuctType>
   <LeakinessObservedVisualInspection>connections sealed w mastic</LeakinessObservedVisualInspection>
</DuctLeakageMeasurement>