Re: [EnergyPlus_Support] Unexpected values for "Zone Thermal Comfort Operative Temperature"

[Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx>]

I have never heard of using a setpoint manager with ideal loads.. I suggest you submit a help desk request- never know it could be a bug.. 


Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions
120 E. Pritchard St.  | Asheboro, NC 27203 
 | Mobile 503-688-8951
<http://www.phasechange.com/>www.phasechange.com 
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On Mon, Mar 10, 2014 at 12:30 AM, <mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx <<mailto:jeannieboef@xxxxxxxxx>jeannieboef@xxxxxxxxx> wrote:
>  
> How would your setup operate if you served a server room which required cooling and a office which required heating from the same AHU? The phrase VAV with reheat comes to mind.
> Basically, I believe you are dealing with  a control issue, which should be solvable by using the correct setpointmanager objects on the Airloop supply side.
> Start by checking what setpointmanager assigns the setpoint to the sensed node that your cooling coil is referencing.
> I hope I'm on the right track,
> Jean
> 
> Mit freundlichen Grüßen- Sent from my iPhone (excuse the brevity)
> i. A.
Jean Marais
b.i.g. bechtold
Tel.   <tel:%2B49%2030%206706662-23>+49 30 6706662-23
> On 10.03.2014, at 03:42, <<mailto:omar.ay.ibraheem@xxxxxxxxx>omar.ay.ibraheem@xxxxxxxxx> wrote:
> 
>>  
>> Hi All,

>> 
>> 
>> I?m using a ZoneHVAC:IdealLoadsAirSystem and a Thermostat:ThermalComfort. As I am only concerned with cooling, a ThermostatSetpoint:ThermalComfort:Fanger:SingleCooling is used which in turn references a schedule with a constant PMV value of +0.5 for the whole year. However, the simulation results show that cooling occurs even at very low operative temperatures. On close inspection I discovered that the reported values for Zone Thermal Comfort Operative Temperature are way below any comfort standard including the Fanger model selected for this simulation in the People object (values as low as 13C are reported). This would explain why cooling occurs even when operative temperatures are around 14C in January but does not explain why the Zone Thermal Comfort Operative Temperature values are very low in the first place. I have also checked the coincident values for Zone Thermostat Cooling Setpoint Temperature and found them to be within the expected range of temperatures that yield a PMV of +0.5.

>> 
>> 
>> My question here is:

>> Why are the values for Zone Thermal Comfort Operative Temperature during the heating season very low (as low as 13C) and accordingly why does cooling occur even at very low operative temperatures during occupied hours bearing in mind that:

>> -       A ThermostatSetpoint:ThermalComfort:Fanger:SingleCooling object is used with a constant PMV schedule value of +0.5

>> -       Typical values for clothing, activity and air velocity have been selected

>> -       The Fanger model has been selected in the People Object

>> -       Coincident values for Zone Thermostat Cooling Setpoint Temperature are in the range of 26-28

>> 
>> 
>> Your help is much appreciated

>> 
>> 
>> Regards,

>> Omar

>> 
> 




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