I think one of the best articles related to this topic is "Review of organic Rankine cycles for internal combustion engine exhaust waste heat recovery" by Charles Sprouse III and Christopher Depcik. Plz find the attached file

a lot of research has been done on ORC. check sciencedirect.

The following literature review may be useful for your research

Abstract - The increasingly worldwide problem regarding rapid  economy development and a relative shortage of energy, the internal combustion engine exhaust waste heat and environmental pollution has been more emphasized heavily recently. Out of the total heat supplied to the engine in the form of fuel, approximately, 30 to 40% is converted into useful mechanical work; the remaining heat is expelled to the environment through exhaust gases and engine cooling systems, resulting in to entropy rise and serious environmental pollution,

so it is required to utilized waste heat into useful work. The recovery and utilization of waste heat not only conserves fuel (fossil fuel) but also reduces the amount of waste heat and greenhouse gases damped to environment. The study shows the

availability and possibility of waste heat from internal combustion engine, also describe loss of exhaust gas energy of an internal combustion engine. Possible methods to recover the waste heat from internal combustion engine and performance and emissions of the internal combustion engine. Waste heat recovery system is the best way to recover waste heat and saving the fuel.

Ref:Review on Exhaust Gas Heat Recovery for I.C. Engine

by J. S. Jadhao, D. G. Thombare

International Journal of Engineering and Innovative Technology (IJEIT)

Volume 2, Issue 12, June 2013, 93-100

ijeit.com/vol%202/Issue%2012/IJEIT1412201306_18.pdf

Thanyou sir...(Maddali V S Murali Krishna)