[TRNSYS-users] Infiltration and ventilation

[المهندس حيدر ناجي]

You can use equations in particular and fetch data from places or models in
the drawing easily

‫في الأربعاء، 2 نوفمبر 2022 في 6:25 م تمت كتابة ما يلي بواسطة ‪ali
shahrouzian via TRNSYS-users‬‏ <‪trnsys-users at lists.onebuilding.org‬‏>:‬

> Dear all TRNSYS users,
>
> Hi,
>
> I have some issues about determining infiltration and ventilation rates of
> a residential building.
>
>
>
> I am modeling a single-family residential building in TRNSYS using Type
> 56. I have divided it into four thermal zones: 1) basement 2) main floor,
> including two zones, and 3) Attic. I am going to satisfy building heating
> and cooling loads by the usage of an AHU system. So, to estimate the
> capacity of the system, firstly, I need to determine the rates of
> infiltration and ventilation of the building.
>
>
>
> To determine the minimum ventilation rate in each thermal zone:
>
> 1-     I am wondering whether I should use the equation written in Ashrae
> standard 62.2 or Ashrae standard 62.1? I mean:   Q(cfm) = *0.03**building
> area+*7.5**number of people [Ashrae* 62.2*]  or   Q(cfm) = *0.06**building
> area+*5**number of people [Ashrae* 62.1*]
>
> 2-     Am I permitted to use these equations to estimate the ventilation
> rate of each thermal zone individually? Or they are only applied to
> determine the ventilation rate of the whole-building.
>
> 3-     Is the ventilation rate estimated using these equations included
> exhausted rates of bathroom(s) and restroom(s)? or do I have to add the
> exhausted rates to the Q(cfm) obtained from the above equations?
>
>
>
> As for infiltration:
>
> 4-     If the building's effective leakage area or the quantity of
> building airtightness is known, how can I specify the value of infiltration
> rate of each thermal zone in the building?
>
> 5-     There are two approaches in Ashrae fundamental (Chapter 16) to
> determine building infiltration rate, called: 1) basic and 2) enhanced
> models, which are suitable for single zone buildings. Given my building
> consists of 4 thermal zones, Am I permitted to use these methods to
> estimate the infiltration rate of each thermal zone?
>
> 6-     Without knowing the building's effective leakage area or the
> quantity of building airtightness, how can I determine the infiltration
> rate of the building? Are there any equations in this case?
>
>
>
> I would appreciate it if you could help me in these cases.
>
>
>
> Best regards,
>
> Ali
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>
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