Roof Top vs Ceiling units

[Pravin]

Hi all,
Your Suggestions and comments would be appreciated;
A hall of 680 sq. m floor area, with a seated capacity of 900, which at times is also being used to host special Fairs with multi stalls.
1. Would it be appropriate for a ground level air flow or overhead air flow?
2. Would roof top package unit or stand alone ceiling split units be ideal?
3. What would be the ideal cooling capacity required- Bearing in mind that we are in a tropical climate with the mercury nearing 46 deg. centigrade.

Tks & Regards

Pravin

[afeef]

hi sir

the a/c system is preferably to throw the cool air on the faces of resedance, so a floor unit is beter, and install it about 1.5 meter over the ground(this is the breathing line)
another benefit of floor unite is:easy mentenance

also to be on safe side, install multy separate a/c systems, if any one is faulty for any reason,you can depend upon the others
about the capacity you need, thes is depend on the wall thickness,type of brick,temp.deferance,windows,,,,,etc.
but i have conservative measurment for a/c capacity is that:
8 square meters of aria needs 1 ton of refrigeration
good luck

[Lc_shi]

only for your reference
1. it's better to use ground level air flow by the air supply outlet beside the seat and the exhaust push out from above
2.roof top unit is better for it's easy to arrange the air flow
3. need calculate carefully,if by raw estimate,it should be up to 300w/m2(not exactly,just by me. suggest apply ERV for saving energy.

regards
LC

[Pravin]

Hi Afeef,
Thank so much for your reply. As a matter of fact there is an existing air cooled liquid chiller of the 30 GF series having 3 compressors Carlyle 06EF 299. Two air handling units discharge in two ducts which are at floor level. The problem arises when stalls are set up in the hall. The stalls leave a clearance of not more than 50 cms from the ducts, which rtesult in hot spots at the centre of the hall and due to frequent problem and abrupt faults of the existing chiller, the whole air conditioning system is to be replaced. The dimensions of the Hall is as follows; L 31.40M x W 21.68m x H 10.0m. What would be the best alternative to the existing carrier chiller?

Regards

pravin

hi sir

the a/c system is preferably to throw the cool air on the faces of resedance, so a floor unit is beter, and install it about 1.5 meter over the ground(this is the breathing line)
another benefit of floor unite is:easy mentenance

also to be on safe side, install multy separate a/c systems, if any one is faulty for any reason,you can depend upon the others
about the capacity you need, thes is depend on the wall thickness,type of brick,temp.deferance,windows,,,,,etc.
but i have conservative measurment for a/c capacity is that:
8 square meters of aria needs 1 ton of refrigeration
good luck

[Pravin]

Hi Lc Shi,
Thank so much for your reply. As a matter of fact there is an existing air cooled liquid chiller of the 30 GF series having 3 compressors Carlyle 06EF 299. Two air handling units discharge in two ducts which are at floor level. The problem arises when stalls are set up in the hall. The stalls leave a clearance of not more than 50 cms from the ducts, which rtesult in hot spots at the centre of the hall and due to frequent problem and abrupt faults of the existing chiller, the whole air conditioning system is to be replaced. The dimensions of the Hall is as follows; L 31.40M x W 21.68m x H 10.0m. What would be the best alternative to the existing carrier chiller?

Regards

pravin

only for your reference
1. it's better to use ground level air flow by the air supply outlet beside the seat and the exhaust push out from above
2.roof top unit is better for it's easy to arrange the air flow
3. need calculate carefully,if by raw estimate,it should be up to 300w/m2(not exactly,just by me. suggest apply ERV for saving energy.

regards
LC

[Lc_shi]

Hi Sir
i'm not sure if change all the system including the air duct or only change the chiller. Do you confirm the capacity is OK? how about the fresh air supply? suggest buy module chiller easy to adjust capacity to meet load change and abrupt failure.


rgds
LC