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Modelling a simple MVHR system
Posted: Thu Apr 29, 2010 11:37 am
by ab3sed
I've created a simple model of a three bedroom house for the purposes of my dissertation and the aim is to compare different fabric types and buildups to see the effect on the heating load. I am assuming that there is no auxillary heat input, but I would like the model to take into accout that there is mechanical ventilation with heat recovery. What is the simplest & best way of inputting this into the model? I am using version 5.9.
Thanks
Re: Modelling a simple MVHR system
Posted: Thu Apr 29, 2010 8:26 pm
by ZapBran
hey... what options have you tried so far? I don't want to go over ground you have trod on already.
Are you wanting to use or avoid the detailed HVAC?
Your tutors will have their opinion - what're they sayin'?
Re: Modelling a simple MVHR system
Posted: Thu Apr 29, 2010 9:33 pm
by ab3sed
I'm wanting to avoid the detailed HVAC. I think it's important that my simulation takes into account that the heat in the air is recovered, but I dont know enough about the specifics of the MVHR I'd be using to input it in a detailed manor. I havent tried putting it in yet so you wouldnt be covering old ground, I'm wondering if it can be done with an auxillary ventilation input in the air exchanges template manager? (and change the adjacent condition?) I'm a bit out of my depth here as I have only modelled naturally ventilated buildings before, so any help at all would be much appreciated!
Re: Modelling a simple MVHR system
Posted: Sat Jun 08, 2013 11:49 pm
by electromechanics
Hi Guys,
Did you ever come up with a method to do this?
I am in the very same situation.
Kind regards,
Alan C
Re: Modelling a simple MVHR system
Posted: Mon Jun 10, 2013 8:54 am
by Complex Potential
I have found two simplified ways of doing this without HVAC.
The first is that you set up and assign a system type through Apache and set the heat recovery % via the ventilation tab of the system menu. In Vista you can then check the aux vent load for the room and compare it against a hand calc for a given instant in time to check that it is being account for.
The other method is that you apply a profile to the adjacent condition (ie supply temperature) of the aux vent in the air exchanges tab which has both outside and inside air temperatures as variables and mimics the heat recovery mechanic. This requires a bit of knowledge about writing your own profiles in equation form.