BBel's profile - activity

A short question. Is it possible to comment out multiple lines at once in an E+ idf file? I can't seem to find information on the topic.

If I compare the EnergyPlus output variable "Environment: Site Wind Speed" to the corresponding epw weather file, the windspeeds don't always correspond ( although δmet, αmet, zmet = δsite, αsite, zsite in the formula Usite=Vmet(δmet/zmet)^αmet * (zsite/δsite)^αsite ) (Formula extracted from: "Local Wind Speeds Calculations" in the Engineering Reference) Does anybody know why? Sometimes the windspeeds do correspond. Sometimes the difference is bigger than 1,5m/s.

Hello, I want to model a window vent in energyplus by using a crack in an airflow network. Is there a way to limit the mass flow rate through a crack to a constant (maximum) value from the moment that a certain pressure difference over the crack is reached? I can't figure out how to do this.

This problem is tackled in the Ventilation Controls Virtual Test Bed. A paper containing more info can be found on: http

Before asking this kind of question, please show what you have tried so far. You can easily look this information up in

Ask output data for the flow and the pressure in the node (minute timestep). Look at the timesteps before the error. Thi

@Siva, Yes, I was able to solve my problem. "One possible cause is that this node may not be connected directly, or ind

Ask output data for the flow and the pressure in the node (minute timestep). Look at the timesteps before the error occu

Hello Siva, Yes, I was able to solve my problem. "One possible cause is that this node may not be connected directly, o

Hello Siva, Yes, I was able to solve my problem. One possible cause is that this node may not be connected directly, or

@Paul Graham, @David Goldwasser. Did you find a workaround? I am facing the same problem. In my case trans is controlled

@Paul Graham, @David Goldwasser. Did you find a workaround? I am facing the same problem. In my case trans is controlled

@Paul Graham, @David Goldwasser. Did you find a workaround? I am facing the same problem. In my case trans is controlled

Hello @NirajP. Did you have any luck yet? I am experiencing the same problem.

In my multizone Energyplus model with AFN I have no gas equipment and the Carbon Dioxide Generation Rate in the people schedule in every zone is set to 0. The only CO2 sources are ZoneContaminantSourceAndSink:Carbondioxide objects.(1 in every zone)

While the output variable values from "Contaminant Source or Sink CO2 Gain Volume Flow Rate" correspond to the input schedule (right y-axis) in the "ZoneContaminantSourceAndSink:Carbondioxide" object, the "Zone Contaminant Source or Sink CO2 Gain" (left y-axis) doesn't correspond to anything. Shouldn't it be the same as the Contaminant Source or Sink CO2 Gain Volume Flow Rate? (Because there are no other sources in the zone)

Is this expected behavior or am I missing something?

@Chandan Sharma Thank you for your explanation. I think confusing is an understatement. I'll post a ticket to ask for an

Zone Contaminant Source or Sink CO2 Gain seems to be wrong In my multizone Energyplus model with AFN I have no gas equip

Zone Contaminant Source or Sink CO2 Gain seems to be wrong In my multizone Energyplus model with AFN I have no gas equip

dmasri@masdar.ac.ae Were you ever able to solve this error? At the moment I'm facing the same problem...

@dmasri@masdar.ac.ae Were you ever able to solve this error? At the moment I'm facing the same problem...

An EMS actuator to override the fan flow rate with calling point InsideHVACSystemIterationLoop did the trick. However I

An EMS actuator to override the fan flow rate with calling point InsideSystemHVACIterationLoop did the trick. However I

@mdahlhausen. Thanks for your answer, but the flowrate inside the air loop is still not following the outside air flow r

Scheduled fan flow rate in multizone model I can't seem to get this right... What is the correct way to modify the volum

@mdahlhausen. Thanks for your answer, but the flowrate inside the air loop is still not following the outside air flow r

Any update on nightventilation with 2 fans? If I use night ventilation with a supplyfan and a return fan I get strange b

Scheduled fan flow rate in multizone model I can't seem to get this right... What is the correct way to modify the volum

Just a thought: I have the impression that this is a bug in E+. I think the relief inlet node pressure is lowered by the

How to model a heatexchanger inside an airflownetwork? In the example file of the MultiZone_SmallOffice_HeatRecoveryHXSL

Just a thought: I have the impression that this is a bug in E+. I think the relief inlet node pressure is lowered by the

How to model a heatexchanger inside an airflownetwork? In the example file of the MultiZone_SmallOffice_HeatRecoveryHXSL

How to model a heatexchanger inside an airflownetwork? In the example file of the MultiZone_SmallOffice_HeatRecoveryHXSL

How to model a heatexchanger inside an airflownetwork? In the example file of the MultiZone_SmallOffice_HeatRecoveryHXSL

How to model a heatexchanger inside an airflownetwork? In the example file of the MultiZone_SmallOffice_HeatRecoveryHXSL

What is the link between AFN Linkage Mass Flow Rate [kg/s] and System Node Mass Flow Rates? In my simulation my airflown

What is the link between AFN Linkage Mass Flow Rate [kg/s] and System Node Mass Flow Rates? In my simulation my airflown

How to model a heatexchanger inside an airflownetwork? In the example file of the MultiZone_SmallOffice_HeatRecoveryHXSL

How to model a heatexchanger inside an airflownetwork? In the example file of the MultiZone_SmallOffice_HeatRecoveryHXSL

Thanks for looking into this. I'll have a look at the spreadsheet.

@Julien, nice idea that I'll keep in mind for other simulations, but the schedule values don't follow a fixed pattern. The schedule is a yearly schedule that is composed of weekly schedules that are composed of different daily schedules.

Can an ems program look forward/backwards in a predefined schedule. E.g. It's 09:30h and I want a sensor to sense the schedule value at 10:30h? For looking back this seems to be possible with a trend variable but I was wondering if there is another option.

Apparently the cause of the problem is a bug in Energyplus v.8.3. In v.8.4 the exhaust mass flow rate is ok. I double checked it by simulating another case.

I have a two zone model. In the first zone I have an air supply + a fictional return node, in the second zone I have defined the opposite: a fictional supply node + a return node. In the first zone I have also defined a dummy exhaust fan to balance air system flows when using ZoneMixing.

However in the output the Zone Exhaust Air Mass Flow Rate in the zone with the dummy fan is always 0, while this should be the fixed flow rate of the dummy fan. (correct me if I'm wrong)

The fan is Decoupled. The exhaust fraction is set to be unbalanced.

In the ZoneAirMassFlow object Adjust Zone Mixing For Zone Air Mass Flow Balance is on ('yes'). According to the output the availability schedule of the fan is ok.

Does anyone know what could be causing this?