IT Equipment and Systems, Housed in Data Centres, Consume a Considerable Amount Ofenergy. most of the Electrical Energy Consumed by the Data Centre IT Equipment is Released in Theform of Heat. Cooling Issues will have a Significant Impact on the Thermal Manageability and Energyefficiency of the Cooling Infrastructure. in this Paper, a Numerical Analysis of Flow and Temperaturedistribution of a Raised-Floor Data Centre is Conducted in Order to Evaluate the Thermal Performance Ofthe Data Centre. the Effect of the Computer Room Air Conditioning (CRAC) Location and Flow Rate Onthe Data Centre Performance in Investigated Using Thermodynamic-Based Performance Metrics.