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Re: [EnergyPlus_Support] question about air-air heat recovery with economizer
As I read from the IO reference, both ECONOMIZER and BYPASS could be
specified together with the air-air total heat recovery. The difference is
that by specifying BYPASS the outside air flow rate remain the minimum
value whether it passes the HX or not.
-Chaoqin
--On Thursday, November 04, 2004 3:41 PM -0500 Richard Raustad
<RRaustad@xxxxxxxxxxxx> wrote:
> Economizer choice for Controller:Outside Air should be set to "Bypass"
> when heat recovery is used. See Heat Exchanger:Air To Air:Generic in
> the IO Reference Manual for further details.
>
> Chaoqin Zhai wrote:
>
>> Hi,
>>
>> I have an air-air total heat recovery in the system. In addition, I
>> set the
>> system could go into economizer mode when the outdoor condition is
>> within a
>> certain limit. When I ran the simulation using EnergyPlus, an error
>> message
>> is generated, which said: HEAT EXCHANGER:AIR TO AIR:GENERIC "ERV" average
>> air volume flow rate is <50% or >130% of the nominal HX supply air volume
>> flow rate.
>>
>> To my understanding it is because the outside air flow rate is getting
>> higher than the minimum outside air flow rate, which is the same as
>> nominal
>> air flow rate of the ERV, when the system is in economizer mode. Am I
>> right? Will this warning affect the calculation accuracy of the
>> simulation?
>>
>> Thanks a lot!
>>
>>
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>>
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>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
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