A　data　center　test　model　was　used　to　analyze　the　energy　dissipation　characteristics　and　energy　consumption　of　a　data　center.　The　results　indicate　that　adequate　heat　dissipation　from　a　data　center　cannot　be　achieved　only　from　heat　dissipation　through　the　building　envelope　during　Beijing　winter　conditions.　This　is　because　heat　dissipation　through　the　building　envelope　covers　about　19.5%　of　the　total　data　center　heat　load.　The　average　energy　consumption　for　an　air　conditioner　is　4　to　5　kW　over　a　24-h　period.　The　temperature　difference　between　the　indoor　and　outdoor　air　for　the　data　center　with　a　thermosyphon　heat　exchanger　is　less　than　20　degrees　C.　The　energy　consumption　of　the　thermosyphon　heat　exchanger　is　only　41%　of　that　of　an　air　conditioner.　The　annual　energy　consumption　can　be　reduced　by　35.4%　with　a　thermosyphon　system.　In　addition,　the　effect　of　the　outdoor　temperature　on　the　energy　consumption　of　an　air　conditioner　is　greater　than　the　indoor　room　temperature.　The　energy　consumption　of　an　air　conditioner　system　increases　by　5%　to　6%　for　every　1　degrees　C　rise　in　the　outdoor　temperature.