Google Earth Engine implementation of the S-SEBI surface energy balance model (Roerink et al. 2000). Available both as GEE application and library.
Roerink, G.; Su, Z.; Menenti, M. S-SEBI: A Simple Remote Sensing Algorithm to Estimate the Surface Energy Balance. Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere 2000, 25, 147–157.