An　all-year　cooling　system　integrated　with　a　rotary　booster　and　a　compressor　was　developed　to　reduce　the　energy　consumption　of　data-com　center,　and　the　experimental　setup　for　the　prototype　was　established.　The　prototype　of　the　integrated　cooling　system,　which　was　running　with　the　compressor　in　the　throttling　(CT)　mode　and　the　rotary　booster　in　the　throttling　(BT)　or　non-throttled　(BN)　mode,　was　experimented　comprehensively.　Results　show　that　when　the　difference　between　indoor　and　outdoor　temperatures　(Delta　t)　is　25　degrees　C,　the　maximum　Q　and　energy　efficiency　ratio　(EER)　of　the　system　running　in　BT　mode　are　18.58　kW　and　14.66,　respectively.　The　EER　of　the　system　running　in　BT　mode　becomes　smaller　than　that　of　the　system　in　BN　mode　when　Delta　t　is　15　degrees　C.　To　meet　the　cooling　requirements,　the　switching　parameter　from　CT　to　BT　mode　of　the　system　should　be　set　to　Delta　t　=　-2　degrees　C,　whereas　it　should　be　set　to　Delta　t　=　25　degrees　C　when　the　BT　mode　is　switched　to　BN　mode.　However,　the　switching　parameter　from　BT　to　CT　or　BN　mode　should　be　set　to　Delta　t　=　0　degrees　C　or　15　degrees　C,　respectively,　to　increase　the　EER.