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[EnergyPlus_Support] Question on run time fraction

We are interested in using Energy Plus to look at typical heating 
and cooling system runtime at different load conditions. The model 
comprises a single story residence with a constant volume 
residential forced air furnace (FURNACE: HEATCOOL), a DX cooling 
coil (COIL:DX:CoolingBypassFactorEmpirical), and an electric 
resistance heating coil (COIL:ELECTRIC:HEATING). We are modeling the 
system using a cycling fan schedule.

To estimate compressor runtime over the simulation time step (one 
hour time step), it is appropriate to use the cooling coil runtime 
fraction? We have run simulations using different internal and 
ambient load profiles and the runtime fractions vary from 0.02, 0.06 
and 0.1. There is some confusion about what the runtime fraction 
actually represents. Does it represent the fraction of the time step 
that cooling would be on, or is it the rate at which the compressor 
cycles. Any feedback or advice would be appreciated. Thanks

Brian Baker







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