Heat recovery systems can be divided into two categories based on the thermal parameters of the system: Systems for energy recovery and conversion from waste heat with high thermal parameters (above 70oC) and systems for energy recovery and conversion from waste heat with low thermal parameters (below 70oC).
Heat recovery and energy conversion systems above 70oC are used in technological processes that take place in the energy, food, chemical, and other process-based industries where large amounts of waste heat are released. This waste heat with high thermal parameters can be used to improve the energy and economic efficiency of enterprises by directly heating air in ventilation systems or by augmenting technological processes requiring higher temperatures (e.g. the heat source for heat pumps used for pasteurization in the food industry, or for the production of electricity in the organic Rankine Cycle or Kalina Cycle systems). Waste heat with such elevated thermal parameters can also be used for refrigeration and air-conditioning processes (e.g. converting thermal energy into chilled water using absorption or adsorption chillers).