Waste heat represents a large potential energy source, as roughly half of all energy produced by human actions becomes recoverable waste heat. The largest part of this waste heat has a temperature below 100°C and is called low-grade waste heat.
In most cases this wasted heat is simply released into the environment. And while heat may seem like a harmless emission, reuse of this wasted energy can potentially lead to a massive reduction of both CO2 emissions and heat pollution of water supplies.
At ZIGRID we see the wasted heat as a wasted opportunity: By reusing it, we could make an important contribution to meet international targets for renewable energy.
Efficient solutions for reusing medium- and high-grade heat waste above 100°C already exist. For low-grade waste heat, however, utilizing and regenerating power has been a challenge. Until now, district heating has more or less been the only viable option.
ZIGRID’s solution uses the difference in temperature between heat-flows and cold flows of water – and converts it into new power.
The standard heat-power module is the core component. A group of power modules together forms a 100 kW power unit installed in a standard container.
The modular structure of the core components enables the units to be mounted in cascade, producing electricity and reducing heat in each cascading step. Unit cascades can be mounted in parallel if large heat-flows are provided. Thus, the unit is very flexible and able to address small as well as large flows of waste heat.