Heating¶
Table of Contents
Heating system type¶
HPXML provides two difference HVAC system elements that can provide heating:
HeatingSystem that only provides heating and HeatPump which can provide
heating and cooling.
Heat Pump¶
The HeatPump element in HPXML can represent either an air-source heat pump
or ground source heat pump in HEScore. Which is specified in HEScore is
determined by the HeatPumpType element in HPXML according to the following
mapping.
| HPXML Heat Pump Type | HEScore Heating Type |
|---|---|
| water-to-air | gchp |
| water-to-water | gchp |
| air-to-air | heat_pump |
| mini-split | mini_split |
| ground-to-air | gchp |
The primary heating fuel is assumed to be electric.
Note
Prior to HEScore v2016 mini-split heat pumps were translated as ducted air-source heat pumps with ducts in conditioned space. With the addition of mini split heat pumps in HEScore v2016, they are now categorized appropriately.
If a heat pump has a FractionCoolLoadServed set to zero, the heat pump is assumed to provide only space heating. If the heat pump is connected to the same distribution system as a separate cooling system and serves the same portion of the house, the house will translate but fail in Home Energy Score because that configuration is not supported.
Heating System¶
The HeatingSystem element in HPXML is used to describe any system that
provides heating that is not a heat pump. The HeatingSystemType subelement
is used to determine what kind of heating system to specify for HEScore. This
is done according to the following mapping.
| HPXML Heating System Type | HEScore Heating Type |
|---|---|
| Furnace | central_furnace |
| WallFurnace | wall_furnace |
| FloorFurnace | wall_furnace |
| Boiler | boiler |
| ElectricResistance | baseboard |
| Stove | wood_stove |
Note
HPXML supports other values for the HeatingSystemType element
not in the list above, but HEScore does not. Other heating system
types will result in a translation error.
A primary heating fuel is selected from the HeatingSystemFuel subelement of
the primary heating system. The fuel types are mapped as follows.
| HPXML | HEScore |
|---|---|
| electricity | electric |
| renewable electricity | electric |
| natural gas | natural_gas |
| renewable natural gas | natural_gas |
| fuel oil | fuel_oil |
| fuel oil 1 | fuel_oil |
| fuel oil 2 | fuel_oil |
| fuel oil 4 | fuel_oil |
| fuel oil 5/6 | fuel_oil |
| propane | lpg |
| wood | cord_wood |
| wood pellets | pellet_wood |
Warning
HPXML supports other fuel types that could not be mapped into existing HEScore fuel types (i.e. coal, wood). Encountering an unsupported fuel type will result in a translation error.
Heating Efficiency¶
Heating efficiency can be described in HEScore by either the rated efficiency (AFUE, HSPF, HSPF2, COP), or if that is unavailable, the year installed/manufactured from which HEScore estimates the efficiency based on shipment weighted efficiencies by year. The translator follows this methodology and looks for the rated efficiency first and if it cannot be found sends the year installed.
Wood stoves and electric furnaces and baseboard heating do not use the efficiency input in HEScore. Therefore, for these heating types an efficiency is not determined.
Rated Efficiency¶
HEScore expects efficiency to be described in different units depending on the heating system type.
| Heating Type | Efficiency Units |
|---|---|
| heat_pump | HSPF2, HSPF |
| mini_split | HSPF2, HSPF |
| central_furnace | AFUE |
| wall_furnace | AFUE |
| boiler | AFUE |
| gchp | COP |
The translator searches the HeatingSystem/AnnualHeatingEfficiency or
HeatPump/AnnualHeatEfficiency (HPXML v2) or HeatPump/AnnualHeatingEfficiency (HPXML v3)
elements of the primary heating system.
Both AnnualHeatingEfficiency(or AnnualHeatEfficiency)/Units and
AnnualHeatingEfficiency(or AnnualHeatEfficiency)/Value
are searched and expected to match the above table, with precedence to first/newer units.
Shipment Weighted Efficiency¶
When an appropriate rated efficiency cannot be found, HEScore can accept the
year the equipment was installed and estimate the efficiency based on that. The
year is retrieved from the YearInstalled element, and if that is not
present the ModelYear element.