Coincident Sizing Factor Mode
My model has PlantLoop
(chillers) and CondenserLoop
(cooling towers). I did sizing runs in three different settings.
NonCoincident
plan sizingCoincident
plant sizing, andCoincident Sizing Factor Mode
isNone
Coincident
plant sizing, andCoincident Sizing Factor Mode
isGlobalCoolingSizingFactor
Sizing:Parameters
Cooling Sizing Factor
is 1.15.
The autosized chiller capacities are shown in the html files as follows.
"Coincident, None" chiller capacity is approximately 1% smaller than "NonCoincident" chiller capacity. I think Coincident plant sizing worked properly. Of course, I made Do HVAC Sizing Simulation for Sizing Periods
Yes
and Type of Zone Sum to Use
of all AirLoops Coincident
.
My question is about Coincident Sizing Factor Mode
.
My assumption was that:
- If I choose
None
, the autosized chiller capacity would be equal to the coincident peak demand. - If I choose
NonCoincident
, the autosized chiller capacity would be 1.15 times the coincident peak demand.
However, the simulation results suggest that:
- When I chose
None
, The autosized chiller capacity = The coincident peak demand x 1.15 - When I chose
GlobalCoolingSizingFactor
, The autosized chiller capacity = The coincident peak demand x 1.15 x 1.15
Are these the intended function of Coincident Sizing Factor Mode
? If that's the case, I should choose None
. Who would want to multiply the sizing factor twice?