Split System AC - Outdoor Unit Enclosures

[Tyro84]

Dear All

I'd be very grateful for any pointers/references on space requirements for AC outdoor unit enclosures.

Manufacturers' literature doesn't have the exact info I'm looking for as I'm looking at a slightly unusual application. Can't find anything much use in the AHSRAE and CIBSE guides either.

The Client requires the outdoor units to be mounted within the building envelope - i.e not on the roof or anywhere outside. Therefore we are mounting the units in concrete enclosures with a louvred opening to outside (sorry but I can't provide any layouts).

The Client is now concerned about:
1) short-circuiting of hot exhaust air back into the enclosure
2) adequate fresh air provision to the suction side of the unit.

This is a design and build contract so we cannot base our design on specific models as it is ths contractor's decision. However, the dimensions we have allowed for are as follows:

TYPICAL OUTDOOR UNIT:
Max Width: 850mm

Max Height : 850mm

Mex Depth: 350mm

ENCLOSURE INTERNAL DIMENSIONS:
Assuming 1 unit per enclosure: 2050mm(W) x 1850mm (H) x 950mm (D)

Assuming 2 units per enclosure: 2900mm(W) x 1850mm (H) x 950mm (D)

Assuming 3 units per enclosure: 3750mm(W) x 1850mm (H) x 950mm (D)

LOUVRE REQUIREMENTS:
De-mountable
Min. 70% free area

The above is based on a Daikin SkyAir RR series catalogue. However - catalogue does not give any recommenations for our exact set-up, plus the client is still concerned about opints 1) and 2) above.

Any info/opinions appreciated!

 

[tys90]

I think these are questions for the manufacturer. I would be concerned the condensing unit fan does not have the necessary static pressure to overcome an enclosure and louver. You may want to duct the exhaust side to prevent point #1. The manufacturer should have a condenser airflow and static pressure so you could size duct/louver/enclosures.

I know their VRF system has condensers with higher fan statics so you can place them indoors and in enclosures, not sure the SkyAir series can do the same.

 

[317069]

Could you please explain little more about your system.
your post's title is about split system.
the client is concerned about two points lookes like not ralated to a split system.