The model defines the dynamic behavior of the CHP thermal mass
(i.e. engine block, encapsulated working fluid, and internal heat
exchange equipment) using a single, engine control volume. The
thermal energy stored within this volume is quantified using an
aggregate thermal capacitance capEng and an equivalent
average engine temperature TEng. The heat transfer
between the engine and the cooling water control volume is
quantified using the overall thermal conductance
UAHex, while the heat loss to the surroundings is
quantified using the overall thermal conductance
UALos.