The example shown here is a Marine generating set with a hydraulic PTO mounted onto the flywheel end of the engine.  This set was built to be super Silent with secondary antivibration mounts and all air ducted away from the engine via secondary baffles.

This example is of long-running autonomous generator sets.  These are air cooled sets with dry sumps, modified filtration equipment and oversize fuel sumps.  These were designed for running in a Marine environment autonomously for extended periods of time.  (Trinity Lighthouse)

CHP sets are designed to utilise the waste heat from a diesel or gas generator so that this can be used for either industrial or environmental heating. There are 3 areas where thermal recovery is possible: exhaust gases, engine jacket water and radiant heat around the engine itself. The amount of heat energy recoverable and therefore the overall efficiency of the CHP system is different from application to application, in simple terms, the lower the temperature requirement of the recovered heat, the more heat can be recovered. At one end of the spectrum we would have a closed loop steam plant where the steam has been condensed and returned to the boiler (part of the exhaust) at high temperature, In this case we can only use exhaust heat. At the other end of the spectrum we have environmental heating where it is possible to use air to air heat exchangers on the radiant heat from the block as well as engine jacket water and exhaust gas heat.

All CHP systems are designed and built specifically to the application, this way the efficiencies can be maximised for a given situation.