Re: [EnergyPlus_Support] Heat exchanger smart bypass control

[Don Shirey <shirey@xxxxxxxxxxxx>]

I think you should be able to model this with EnergyPlus.... at least 
the cooling part.

As described in the documentation, the Heat Exchanger:Generic:Air To Air 
object is able to "suspend heat exchange" (e.g., bypass the airflow) for 
the purpose of providing free cooling operation in the absence
of a conventional air-side economizer (i.e., specify BYPASS in the 
EconomizerChoice field of the Controller:Outside Air object).  Set the 
field "ReturnAirTempLimit" in the Controller:Outside Air object to  
RETURN AIR TEMP LIMIT.
 
> anarui.oliveira wrote:
>   
>> I was looking for a Heat Exchanger bypass control that would implement
>> the algorithm:
>>
>> If (Cooling) AND (Outdoor Temperature < Return Temperature) -> Bypass
>> If (Heating) AND (Outdoor Temperature > Return Temperature) -> Bypass
>>
>> instead of controlling based on hard temperature limits.
>>
>> E+ doesn't currently have this kind of control, does it?
>>
>> Thank you,
>> Ana.

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