Re: [EnergyPlus_Support] purchased air

["Michael J. Witte" <mjwitte@xxxxxxxx>]

My apologies for the dealayed response.

Changing the supply air temperature for purchased air does not change the load. 
 Changing the thermostat setpoint would change the load.  The thermostat 
determines the amount of heating/cooling required for the zone.  The supply air 
temperature will change the calculated flow rate for the purchased air unit, 
but it will not change the energy delivered.  To see the impact of your 
changes, add REPORT VARIABLE "System Node MassFlowRate" for the zone inlet 
node, and you should see the flow rates change when the supply air temperature 
is changed.

Mike


On 7 Oct 2005, at 6:47, kir kumar wrote:

> Dear all,
> I have simulated purchased air.idf input file changing the HEATING SUPPLY AIR
> TEMPERATURE from 50C to 70C and COOLING SUPPLY AIR TEMPERATURE from 13C to 1C
> (That means I have increased the load).Also I made the following changes HEATING
> LIMIT------ LIMIT MAXIMUM HEATING FLOW RATE(m^3/s)---- 1 COOLING LIMIT------
> LIMIT MAXIMUM COOLING FLOW RATE(m^3/s)---- 1
> 
> I campared the results of changed purchased air.idf in the aforementioned way to
> the results of purchased air.idf input file(without changes). But I found no
> changes in output. Please explain me why is it so?
> 
> kiran
> 
> 
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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