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RE: Re: [EnergyPlus_Support] How to model a ventilation system with air heat exchanger



Hi Jean,


Thanks for the reply. Option 3 to use  IdealLoadsHVAC with heat exchanger seems like a good option, however simplified.


Option 4: what do you mean by ERV?


I tried to change the Controller:OutdoorAir (Min = Max flow rate), but even so the air temperature increases after the mixing box


In my setting the heat exchanger is before the mixing box, so I would like the air temperature to be the same, so that when the air arrives in the rooms the temperature is the output of the air temperature after the heat exchanger and no more than that



Controller:OutdoorAir,


    OA Controller 1,         !- Name

    Relief Air Outlet Node,  !- Relief Air Outlet Node Name

    Air Loop Inlet Node,     !- Return Air Node Name

    Mixed Air Node,          !- Mixed Air Node Name

    Outside Air Inlet Node,  !- Actuator Node Name

0.033,                  !- Minimum Outdoor Air Flow Rate {m3/s}

    0.0033,                     !- Maximum Outdoor Air Flow Rate {m3/s}

    NoEconomizer,            !- Economizer Control Type

    ModulateFlow,            !- Economizer Control Action Type

    19.,                     !- Economizer Maximum Limit Dry-Bulb Temperature {C}

    ,                        !- Economizer Maximum Limit Enthalpy {J/kg}

    ,                        !- Economizer Maximum Limit Dewpoint Temperature {C}

    ,                        !- Electronic Enthalpy Limit Curve Name

    4.,                      !- Economizer Minimum Limit Dry-Bulb Temperature {C}

    NoLockout,               !- Lockout Type

    FixedMinimum;            !- Minimum Limit Type


Thanks,

Ann



---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <energyplus_support@xxxxxxxxxxxxxxx> wrote:

Option 3: IdealLoadsHVAC with heat exchanger and or economizer

Option 4: I think there is an ERV option which is probably what you're after.

can I use the OutdoorAir:Mixer without mixing the return air?
Yes. The ControllerOutdoorAir object will deturmine how much mixing occurs (you can define DOAS requirements this way).

Mit freundlichen GrüÃ?en- Sent from my iPhone (excuse the brevity)

i. A.
Jean Marais
b.i.g. bechtold
Tel.   +49 30 6706662-23

On 23.10.2013, at 10:24, <welma.pereira@...> wrote:

 

Dear All,


I am modeling a house that has a ventilation system with an air heat exchanger. My problem is to find out which EnergyPlus object to use for that. I have tried two options 

Option1: model an air loop with an AirLoopHVAC:OutdoorAirSystem object

Option2: use a ZoneHVAC:OutdoorAirUnit object

The problem is that using Option1 I can use a heat exchanger like HeatExchanger:AirToAir:SensibleAndLatent for example but I also need to use an OutdoorAir:Mixer, and that is bad because the incoming air should not be mixed with the return air. 

can I use the OutdoorAir:Mixer without mixing the return air?
can I use  the AirLoopHVAC:OutdoorAirSystem object without using the OutdoorAir:Mixer?

If I chose Option2 according to the example file OutdoorAirUnit.idf I need to define a fan for each zone which I think does not represent a real system, you would probably have just one fan to ventilate the whole house or not?

My ultimate question is which system is better to represent a ventilation system of a house with an air heat exchanger?

Does anybody have to do that before?

Thanks.
Ann


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