Does anyone know or where to get this information ?

Typical data center cooling capacity ? in watts/sq.ft. etc. ?
Typical data center power density ? in watts/sq.ft. ?

Any study results showing the trend in cooling and power in data center ?

I am in a process of designing servers in 42U high cabinet that would go into "data center" but not too familiar with the physical constraints or power and cooling limitations.

Thanks !!!!!!