criteria for % of design capacity vs installed capacity?
criteria for % of design capacity vs installed capacity?
(OP)
Hello?
I am working with a condo-hotel hvac design, i already calculated the total capacity (Tons) the building will need. I think that in order to reduce the co$t of installed equipment(Chillers) we can maybe install only a percentage of the total design capacity because of the Usage/schedule factor of the areas. What is the % of design tons you recommend to be installed in a hotel building?
Regards
I am working with a condo-hotel hvac design, i already calculated the total capacity (Tons) the building will need. I think that in order to reduce the co$t of installed equipment(Chillers) we can maybe install only a percentage of the total design capacity because of the Usage/schedule factor of the areas. What is the % of design tons you recommend to be installed in a hotel building?
Regards





RE: criteria for % of design capacity vs installed capacity?
RE: criteria for % of design capacity vs installed capacity?
You do a commercial building, the softawre will find the peak load, you can size for that.
A lot of time the residential type of calcs, sort of average morning and evening, east/west.
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: criteria for % of design capacity vs installed capacity?
Have you done your load calculations in a software and the inputs include proper scheduling for all loads including lighting, occupancy, etc., and the software calculates hour by hour for the entire year ?
If yes, the software will find its peak load. You can even check and find out how many hours this peak load would be there and take a judgemental call as to the diversity to be considered. As a rule of thumb, 0.75 to 0.8 diversity factor is what I would normally consider. But, again it depends a lot on the client inputs, your own assessment of the project and the confidence you have in the inputs.
HVAC68
RE: criteria for % of design capacity vs installed capacity?
Systems have a way of simultaneously peaking at the worst possible time (kind of an HVAC Murphy's law). Clients, during design, are prepared to put up with all kinds of discomfort, occupants are much more picky.
RE: criteria for % of design capacity vs installed capacity?
RE: criteria for % of design capacity vs installed capacity?
Diversity factors just shift undersizing risk from the owner to the Engineer.....
No body will thank you for being hot/cold in their new building.