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Re: [EnergyPlus_Support] Counterparts

You are correct in your interpretation of the equations used for each 
report variable. The difference in these variables is that the Heat 
Exchanger Total Heating/Cooling Rate refers to the energy transfer of 
the heat exchanger (supply air outlet - supply air inlet). The Stand 
Alone ERV Zone Total Heating/Cooling Rate refers to the energy transfer 
to the zone (supply air outlet - exhaust air inlet). In winter the HX 
will usually heat the entering outdoor air but the system effect on the 
zone is cooling. In summer this is reversed. The zone meters record each 
of these report variables for the entire simulation period.

eric_zhou1223 wrote:

> Hi all,
>
> I notice there are variables following below when I run the ERV
> modules:
>
> HVAC,Average,Heat Exchanger Total Heating Rate[W]
> HVAC,Average,Heat Exchanger Total Cooling Rate[W]
> HVAC,Average,Stand Alone ERV Zone Total Heating Rate[W]
> HVAC,Average,Stand Alone ERV Zone Total Cooling Rate[W]
>
> Does the "HVAC,Average,Heat Exchanger Total Heating/cooling Rate[W]"
> refer to Q_total for heat exchanger on Page 541(equation 479) in
> EngineeringReference.pdf(ver 1.30), while the "HVAC,Average,Stand
> Alone ERV Zone Total Heating/Cooling Rate[W]" refer to Q_total for
> ERV on Page 683?
>
> What is the difference between the Q_ERV and Q_HEX ?
>
> I guess the two heat transfer happen in sequence: first the Q_HEX
> and the air outlet condition is found; and then the Q_ERV come into
> being to the zones..
>
> Next,the "Zone,Meter,HeatRecoveryForHeating:EnergyTransfer [J]"
> finally accumulates the ""HVAC,Average,Heat Exchanger Total
> Heating/cooling Rate[W]"".
>
> Is my knowledge right?
>
> Thank you.
> Eric
>
>  


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