Add DraftBoundary enums.md

DraftBoundary - Add Enumerations

Overview

The current definition auc:DomesticHotWaterType element and its child elements is not sufficient to distinguish between direct- and indirect-fired, instantaneous water heaters.

Justification

In both cases, the BuildingSync XML is:

<auc:DomesticHotWaterType>
  <auc:Instantaneous>
    <auc:InstantaneousWaterHeatingSource>
      <auc:Combustion/>
    </auc:InstantaneousWaterHeatingSource>
  </auc:Instantaneous>
</auc:DomesticHotWaterType>

Implementation

This proposal is to add a <auc:DraftBoundary> element with the following enumerations:

• "Direct"
• "Direct indirect"
• "Indirect"
• "Other"

With this proposal, direct- and indirect-fired, instantaneous water heaters are asserted as follows:

Direct-fired, instantaneous:

<auc:DomesticHotWaterType>
  <auc:Instantaneous>
    <auc:InstantaneousWaterHeatingSource>
      <auc:Combustion>
        <auc:DraftBoundary>Direct</auc:DraftBoundary>
      </auc:Combustion>
    </auc:InstantaneousWaterHeatingSource>
  </auc:Instantaneous>
</auc:DomesticHotWaterType>

Indirect-fired, instantaneous:

<auc:DomesticHotWaterType>
  <auc:Instantaneous>
    <auc:InstantaneousWaterHeatingSource>
      <auc:Combustion>
        <auc:DraftBoundary>Indirect</auc:DraftBoundary>
      </auc:Combustion>
    </auc:InstantaneousWaterHeatingSource>
  </auc:Instantaneous>
</auc:DomesticHotWaterType>

References

n/a