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. It looks at the following elements in this order:

• Ducts/DuctLocation

• Ducts/extension/DuctLocation

If Ducts/DuctLocation is omitted and Ducts/extension/DuctLocation exists, the value in the extension will be used. This allows the use of enumerations that are forthcoming in HPXML v4, such as “manufactured home belly”.

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	unvented_crawl
outside	outside
manufactured home belly [1]	manufactured_home_belly

Duct Location mapping (HPXML v3 and v4)

HPXML	HEScore [2]
living space	cond_space
unconditioned space	uncond_basement, vented_crawl, unvented_crawl, uncond_attic
under slab	under_slab
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	exterior_wall
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	unvented_crawl
garage - conditioned	cond_space
garage - unconditioned	unvented_crawl
roof deck	outside
outside	outside
manufactured home belly [1]	manufactured_home_belly

[1] (1,2)

This is not allowed until HPXML v4. To use this value in an earlier version, add it to the Ducts/extension/DuctLocation element and omit the Ducts/DuctLocation element.

[2]

The translator will go down this list and put the ducts in the first space that exists in the house. (e.g. “unconditioned space” in HPXML will put the ducts in the unconditioned basement if it exists, if not it will put it in the vented crawlspace if it exists, and so on.)

Warning

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

Duct Fractions

For each Ducts element with the same insulation level 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 Leakage Measurements

Duct leakage measurements are associated with an AirDistribution element. It can be specified quantitatively or qualitatively.

To quantitatively specify the duct leakage to outside in CFM25 of an AirDistribution system (e.g., duct blaster measurement), the translator expects to find the following elements:

• DuctLeakageMeasurement[not(DuctType)]/DuctLeakage[TotalOrToOutside="to outside" and Units="CFM25"]/Value element with the numeric value

• If the above element is not found, the values of the elements DuctLeakageMeasurement[DuctType="supply"]/DuctLeakage[TotalOrToOutside="to outside" and Units="CFM25"]/Value and DuctLeakageMeasurement[DuctType="return"]/DuctLeakage[TotalOrToOutside="to outside" and Units="CFM25"]/Value will be summed and used.

If quantitative duct leakage measurement is not specified, the translator expects to find either of the following qualitatively specified duct leakage measurement elements:

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

• HVACDistribution/HVACDistributionImprovement/DuctSystemSealed element with the value of “true”.

If neither qualitative nor quantitative element is specified, it will result in an “unsealed” designation.