Innovation of the design and construction of the heat engine.
Suitability of the material of construction, used for designing the heat engine.
The economic considerations of the design of the heat engine.
Difference in height of the piston before and after the reaction.
The chemistry knowledge (based on the reactions chosen from the list).
Tie Breaker: The heat lost to the surroundings will be taken into account, and the team with the least heat lost to the surroundings will be the winner.