READ ME This text describes the data presented in the paper: ======================== Introductory information ======================== Files included in the data deposit (include a short description of what data are contained): 1) Modelling equations of scroll expander 2) Scroll graph to assist the modelling 3) Experimental validation Explain the relationship between multiple data sets, if required: Key words used to describe the data: Equations Scroll graph Validations ========================== Methodological information ========================== A brief method description – what the data is, how and why it was collected or created, and how it was processed: The data is the modelling process of a scroll expander-generator system used in small scale power generation system. The study was conducted to satisfy the porject requirement to explore methods for ultra-low grade waste heat recovery. Instruments, hardware and software used: AutoCAD, Excel, Matlab. Date(s) of data collection: 2015-2016 Geographic coverage of data: Data validation (how was the data checked, proofed and cleaned): The modelling has been validated by our own experiments and other experimental results reported by other researchers. Overview of secondary data, if used: ========================= Data-specific information ========================= Definitions of names, labels, acronyms or specialist terminology uses for variables, records and their values: Explanation of weighting and grossing variables: Outline any missing data: ======= Contact ======= Please contact rdm@ncl.ac.uk for further information