Table of Contents - L.1328 (09/2025) - Specification for waste heat reuse in telecommunication rooms and data centres

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	Development background and effectiveness of waste heat reuse
7	Challenges and limitations in waste heat reuse
8	Technical methods for waste heat recovery
	8.1	Waste heat recovery in water-cooled air-cooling systems
	8.2	Waste heat recovery in air-cooled air-cooling systems
	8.3	Waste heat recovery in liquid cooling systems
9	Workflow of waste heat recovery and reuse system
10	Key metrics of waste heat recovery and reuse
	10.1	Power usage effectiveness
	10.2	Energy reuse factor
	10.3	Recovery factor
	10.4	Waste heat reuse rate
	10.5	Waste heat reuse overall energy efficiency
11	Measurement methodology for waste heat reuse key parameters
12	Calculation of key metrics and their application requirement
Appendix I – A data centre calculation use case
Bibliography