The Design and Organization of Data Centers/Appendix A
Power edit
Air conditioning edit
Common Values
Chiller calcs edit
Assuming that all wattage consumed will end up as dissipated heat (servers do very little mechanical work or yield very little light);
Wattage times 3.41 = BTU/hr
Example:
Server draws 10 amps at 120vac
10 amps X 120 vac = 1200 voltamps (aprox 1200 watts) 1200 VA X 3.41 = 4092 BTU/hr