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Re: [EnergyPlus_Support] Residential heater sizing and cycling question
If you output the report variables using a "detailed" frequency, you
will see when the HVAC system time steps are reduced. Typically this
happens when there is a change in zone temperature. If your simulation
maintains a constant indoor temperature, you may not see this behavior.
If your thermostat schedule uses a setback strategy (e.g. 20C during the
day and 18C during the night) you will most likely see the HVAC system
time step shorten when the thermostat temperature changes.
taharvey2001 wrote:
> I'd like to be able to model a standard constant volume residential
> forced air heater in EnergyPlus and see the impact of Sizing on
> efficiency and heater cycling.
>
> I haven't been able to figure out how to model the heater
> appropriately in E+ or and make sure the heater has sufficiently small
> timestep resolution so the heater can cycle, and the difference in
> efficiency can be seen.
>
> As I understand, the HVAC system timestep is decoupled from the 15
> minute building timestep, allowing it to free-run with an adaptive
> timestep (down to seconds if need be) - is this true, and is there
> anything that need to be done to enable this behavior? Is there anyway
> to see the high-res HVAC transients in the output?
>
> What is the best way to get a const. volume, const BTU heater to model
> residential forced air systems?
>
> thanks,
>
> troy
>
>
--
Richard A. Raustad
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