Thermal Systems Laboratory (TheSLa) aims to design, develop, and assess thermal sub-systems using experiments and computations. The laboratory will be addressing challenges that are India-specific and is globally relevant. Some examples: (a) dust deposition in solar reflector/concentrators and solar PV panels, (b) heat transfer fluids for solar thermal sub-systems, (c) innovative applications like solar convective furnace, solar thermal-based thermo-catalytic ammonia cracking, etc. (d) bubble-induced heat transfer augmentation in nuclear reactors, (e) simulation and modeling of turbulent fluid flow, (f)battery thermal management system, and (g) development of sub-systems for solar and other thermal energy systems. The developed technologies and know-how will enable the implementation of energy-efficient sustainable solutions, in the long run.