Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The rated waste heat fraction is needed to calculate how much waste heat is available at the rated conditions. In addition, up to 6 modifier curves are required per speed.
6. The waste heat modifier curve (function of temperature) is a bi-quadratic curve with two independent variables: outdoor air dry-bulb temperature and the heating coil entering air dry-bulb temperature. The output of this curve is multiplied by the heating input energy, the waste heat fraction of heat input to give the recoverable waste heat.
Field: Speed <x> Waste Heat Function of Temperature Curve Name
The name of a bi-quadratic performance curve (ref: Performance Curves) that parameterizes the variation of the waste heat recovery as a function of outdoor dry-bulb temperature and the entering coil dry-bulb temperature for Speed <x>. The output of this curve is multiplied by the rated recoverable waste heat at specific temperature operating conditions (i.e., at temperatures different from the rating point). The curve is normalized to a value of 1.0 at the rating point. When the fuel type is electricity, the field is either left blank or ignored by the program. When the fuel type is not electricity and the parent object AirLoopHVAC:UnitaryHeatPump:AirToAir:MultiSpeed does not require waste heat calculations, this field is ignored. If the field is blank, a warning will be issued and simulation continues. When the fuel type is not electricity and the parent object AirLoopHVAC:UnitaryHeatPump:AirToAir:MultiSpeed requires waste heat calculations, if this field is left blank, the program assumes a constant value of 1 to make simulation continue and a warning will be issued.
This alpha field determines the type of fuel that
the chillerthis coil uses. This field has seven choices: Electricity, NaturalGas, Propane, Coal, Diesel, Gasoline, FuelOilNo1, FuelOilNo2, OtherFuel1 and OtherFuel2. This is a required field with no default.
(I think "the chiller" above is wrong. It should be "this coil".)
Is the above description in Input/Output Reference insufficient for you?
Waste Heat Fraction is irrelevant if you use electricity for the energy source of the compressor, but you need to input a value greater than 0 as the severe error suggests.
A typical fuel type other than electricity would be Natural Gas, as used in gas heat pumps (absorption heat pumps).
