Rec. ITU-T L.1381 (06/2020) Smart energy solutions for data centres Summary History FOREWORD Table of Contents 1 Scope 2 References 3 Definitions 3.1 Terms defined elsewhere 3.2 Terms defined in this Recommendation 4 Abbreviations and acronyms 5 Conventions 6 Combined cooling heat and power solution 6.1 Main units requirement 6.2 Control strategies 7 Direct alternating current mains supply solution 8 Green energy solutions 9 Liquid cooling system 9.1 The freezing plate type of cooling 9.2 Spray type of cooling 9.3 Immersion type of cooling 9.3.1 Phase change type of cooling 9.3.2 Single phase type of cooling 10 Evaporative cooling solution 10.1 The principle of direct evaporative cooling 10.2 The principle of indirect evaporative cooling 10.3 The principle of evaporative air cooling system 10.4 The characteristics and advantages of an evaporative air cooling system 10.5 Applicable fields and conditions 11 Smart control of environmental conditions 11.1 Smart tracking of temperature 11.2 Smart tracking of relative humidity 11.3 Smart ON/OFF N + 1 redundant function 11.4 Self-adaptation control technique Bibliography