Recoverable Heat for Hot Water

Heat can be recovered from internal combustion engines in CHP systems through a heat exchanger or a number of heat recovery devices. This can include a shell and tube or plate and frame heat exchanger that recovers heat from engine cooling water loop and/or the exhaust stream using a exhaust heat recovery device.  Numerous applications exist for the heat recovered which include:

  • Residential and Commercial heating and water heating

  • Health Clubs, schools, and community swimming pools

  • Nursing homes/Assisted living (therapy pools, laundries and kitchens)

  • Hotels (space heating of common areas, pools, spa, and/or laundry)

  • Numerous industrial applications

  • Boiler feed water pre-heating

  • Other hot water uses

The amount of hot water available varies by equipment size, temperature and application requirements. Heat exchangers are available in several configurations that offer very economical heat recovery options.


Plate and frame heat exchangers  are composed of multiple, thin, slightly separated plates that have very large surface areas and fluid flow passages for heat transfer.




Shell and tube heat exchangers (below) consist of a series of tubes. These tubes contains the fluid that will  be either heated or cooled. The second fluid is in the shell and is pumped  around the tubes to absorb the heat and cooling the initial loop.




Waste heat recovery process systems have many benefits for CHP applications. The recovery process adds to the efficiency of the CHP system, can decrease the fuel and energy consumption needed for other applications (i.e. water or space conditioning).  Integrated into a CHP system, heat recovery can provide space conditioning and hot water as well as power to the building.


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