Here is the information about mini-splits from @Eric Wilson:
I don't have the exact calculation
procedure, but BEopt's variable
tooltips provide some hints about
which columns to use from the NEEP
spreadsheet:
Minimum Heating Capacity [frac]:
Minimum heating capacity as a fraction
of nominal heating capacity at rated
conditions. Can be derived from NEEP's
Cold Climate Air-Source Heat Pump
Specification Listing spreadsheet.
Maximum Heating Capacity [frac]:
Maximum heating capacity as a fraction
of nominal heating capacity at rated
conditions. Can be derived from NEEP's
Cold Climate Air-Source Heat Pump
Specification Listing spreadsheet.
Heating Capacity Retention Fraction
[frac]: The maximum heating capacity
at X degrees F divided by the maximum
heating capacity at 47 degrees F. The
value for X is input in the "Heating
Capacity Retention Temperature [F]"
field. Can be derived from NEEP's Cold
Climate Air-Source Heat Pump
Specification Listing spreadsheet.
BEopt uses a linear relationship
between this point and the rating
point to determine maximum heating
capacity as a function of outdoor
temperature.
Heating Capacity Retention Temperature
[F]: The outdoor drybulb temperature
at which the heating capacity
retention fraction is defined.
Pan Heater [W/unit]: MSHPs designed
for use in cold climates often include
a pan heater in the outdoor unit as an
optional or integrated accessory, to
prevent ice build up from damaging the
coil. This field specifies the power
of the pan heater included in each
outdoor unit. Pan heaters are assumed
to operate when the compressor is
running and the outdoor drybulb is
less than 32 degrees F. Note that the
pan heater typically reduces the Rated
HSPF by 0.1-1.0 points; units with
integrated pan heaters should use the
Rated HSPF input of an equivalent unit
without a pan heater. This input is
available in NEEP's Cold Climate
Air-Source Heat Pump Specification
Listing spreadsheet. It is assumed
that a new outdoor unit is needed
every 1.5 tons (nominal cooling
capacity).
In case it helps:
- the "C" options are roughly equivalent to the Mitsubishi FE series
- the "D" options are roughly equivalent to the Mitsubishi FH series
- the "E" options are roughly equivalent to the Fujitsu AOU*RLS3H
series
Information on air-source heat pumps can be found here: Improved Modeling of Residential Air Conditioners and Heat Pumps for Energy Calculations
