MVHR Design Feedback

[umiq88]

Hi All,

 

I've got a couple of quotes and below is what I feel is the most through. 

 

Floor Area is 206m2 and design flow is 61.8l/s.

Supply and Extract runs are around 13m so going to use 200mm spiral duct to keep velocities low.

Haven't calculated duct losses yet but will be installing 90mm valves and hopefully one pipe to each.

Supplier says to keep each valve below 10l/s this is why there is 3 supplies and 2 extract in the open plan area.

 

Any comments greatly appreciated.

 

[JohnMo]

19 minutes ago, umiq88 said:

Floor Area is 206m2

We are at 192m² living space plus a large plant room of about 25m² so similar size wise, just bigger rooms as we are a 3 bed.

 

We have 7 supply terminals, and 7 extracts.

 

2x extracts in kitchen seems over kill and 3 supplies also over kill for dining/lounge, 2x is ok. You don't need the one in the dining area at all, as the lounge ones will cross flow across the dining area anyway. Sweeping that area. Just up the lounge flows to compensate.

 

Do you need the extract in the hall? Bed 2, 3 and 4 supply will over spill into hall, and that will be swept continuously, locate that extract to the 'hot press'

 

Why spiral duct and not semi flexible? You will need a cross talk attenuator between each room with a branch system. If you go semi flexible you have a plenum and that handles cross talk for all rooms.

[umiq88]

Thanks @JohnMo

 

- Spiral only for Main ducts, Radial semi-rigid plastic to each room.

- I spoke with vendor and he designs for 10l/s per valve. Kitchen Extract is 15l/s hence 2 valves. Supply is same story.

- The hall extract is there to balance the system. There is not enough wet rooms to meet the 61.8l/s requirement. Its in the hall for want of a better place.

 

Edited November 12 by umiq88