# Problem with energy simulation when using hybrid system

Hi guys,

I am trying to do an energy simulation with an hybrid system and i geting the following problem:

• Results do not look accurate. Several results appear for the same zone and the heating consumption is extreamly high.

I attach the file if anyaone could help me. My goal is to explore the possibilities of the natural ventilation component.

Best Regards,

Eduardo

Test_24november.gh (622 KB)

Hi Eduardo,

I leave this question for Chris as he has developed the component and knows more about it. If he couldn’t get back to you soon I will take a look. Let us know if you have already solved your issue.

Mostapha

I decided to take another way and finally i´ve got some results that look realistic. Anyway I have a question regarding natural ventilation component.

An importan parameter for natural ventilation calculation is the terrain type. I can see that ladybug has a componenet where terrain type is taken into account to develope wind profiles. Since EPW files are developed in open terrain i guess this assumption is taken by the simulation but i would like to change it and analysis how results vary.

Question: I would like to know how i can implement terrain type into energy calculations.

Best Regards,

Eduardo

You can use energySimPar component to set up the terrain.

Thank you very much!

Eduardo,

I apologize for responding so late. It seems that Mostapha has pointed you in the right direction and thank you, Mostapha, for being here in my absence.

The problem with 4 sets of outputs was not related to natural ventilation. You connected the geometry of the Ladybug_North component to the north_ input of the run simulation component. If you read the description of the _north input, it is supposed to be either a vector or a number representing the degrees to rotate the model. It is not the compass rose geometry that you get from the Ladybug_North Component.

Also, when setting up a hybrid nat vent and actively cooled building, you should leave a gap of a degree to two between the indoor temperature at which the windows close and the indoor temperature when the cooling system turns on. Otherwise, you get the AC cooling the building to the point that the windows open and suddenly you loose all of the cool air in your space, forcing the AC to come back on 10 minutes later. Something like this would work a lot better:

-Chris