The most widely used cogeneration application is combined heat and power (CHP), but it may not be feasible in warmer climates.
Under such conditions, alternative forms of cogeneration may be considered as a way to increase energy eﬃciency and reduce overall emissions.
We have installed several power plants worldwide based on alternative cogeneration technologies:
Desalination for public or industrial use:
Using waste heat from power plants to make freshwater is an ideal way to maximise economical and environmental beneﬁts.
For communities with scarce drinking water resources, combining power and freshwater generation is becoming increasingly attractive. The waste heat from power generation is used to evaporate sea water or saline water in vacuum distillation units thereby extracting potable fresh water, leaving salts in a brine fraction.
Through the use of multiple level distillation technology, the waste heat can be used repeatedly in sequential stages to yield substantial amounts of fresh water, before being dissipated to the environment.
Since desalination otherwise requires either heat generated from primary energy or the use of electricity, cogeneration of power and water leads to improved overall energy utilisation.
Cooling for air conditioning or other cooling needs requiring electricity
Waste heat can be used to generate chilled water through installation of absorption chillers at a power plant.
The cogeneration of cooling and power signiﬁcantly increases the fuel utilisation at the generating plant. The supply of chilled water will substitute air-conditioning usage – an additional advantage since it reduces the peak power consumption in the area.
Triple generation of power, heat and cooling
Simultaneous triple generation of power, heat and cooling is possible by using absorption chillers. When driven by high temperature waste heat, these can provide both cooling (chilled water) and heating (hot water) at an intermediate temperature level.