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[EnergyPlus_Support] Re: Heat Recovery Option for Compact HVAC: Unitary appears to not work
A bit more info about the heat recovery problem. Using a shoe-box model and compact HVAC, I ran several outside air percentages. Results are below.
RUN-1: 0% outside air = 5,126 therms/year
RUN-2: 30% outside air = 21,635 therms/year
RUN-3: 100% outside air = 64,344 therms/year
RUN-4: 100% outside air with 70% efficient heat recovery=64,344 therms/year . [I was expecting an answer of about 21,000 therms.]
The heat recovery mechanism had negligible effect. The Compact HVAC part of the model is shown below for Heat Recovery. Am I missing something, or have I come across a bug in Energy Plus?
Jim McNally
-----------------------------------------------------------------------------
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "jim_mcnally" <jim_mcnally@...> wrote:
>
> Hi,
> I have been trying to simulate a unitary HVAC device with a heat
> recovery module. I am using the Compact:Unitary equipment simulation.
> The heat recovery option does not materially change the energy use
> results.
> A one zone building with one rooftop unit is my quick running test
> model. The compact unitary part is given below.
>
> Am I missing something?
> Regards,
> Jim McNally
>
>
> ****** COMPACT UNITARY PART OF EP MODEL ******
> !- =========== ALL OBJECTS IN CLASS: COMPACT HVAC:THERMOSTAT
> ===========
>
> COMPACT HVAC:THERMOSTAT,
> TSTAT-ADM_1FL, !- Thermostat Name
> , !- Thermostat Heating Setpoint Schedule
> 22.2222228109101, !- Thermostat Constant Heating Setpoint
>
> , !- Thermostat Cooling Setpoint Schedule
> 22.7777783811828; !- Thermostat Constant Cooling Setpoint
> >
> COMPACT HVAC:THERMOSTAT,
> TSTAT-CENTER, !- Thermostat Name
> ofc_HTG-Temp_SCHED, !- Thermostat Heating Setpoint Schedule
> , !- Thermostat Constant Heating Setpoint
>
> ofc_CLG-Temp_SCHED, !- Thermostat Cooling Setpoint Schedule
> ; !- Thermostat Constant Cooling Setpoint
>
>
> COMPACT HVAC:THERMOSTAT,
> TSTAT-RESIDENT, !- Thermostat Name
> Resident_HTG-Temp_SCHED, !- Thermostat Heating Setpoint Schedule
> , !- Thermostat Constant Heating Setpoint
> {C}
> RESIDENT_CLG-Temp_SCHED, !- Thermostat Cooling Setpoint Schedule
> ;
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