CLOSED CIRCUIT SYSTEM FOR THE WASTE HEAT RECOVERY (VERSIONS) AND METHOD OF WASTE HEAT RECOVERY Russian patent published in 2017 - IPC F01K25/10 F01K7/32 F02G5/02 

FIELD: heating.

SUBSTANCE: closed circuit system for the waste heat recovery includes heat exchanger, expander, recuperator, condensing unit and pump. The heat exchanger is configured to transfer the heat from the external heat source to the working fluid. The expander is in flowing connection to the heat exchanger outlet and is designed to expand the working fluid and produce the mechanical energy. The recuperator is in flowing connection to the expander outlet and is designed to remove the heat from the working fluid. The condensing unit is in flowing connection to the recuperator outlet and is designed to condense the working fluid. The indicated condensing unit contains the multi-stage compressor, which is in flowing connection to the first cooling device and the second cooling device. The first cooling device is located upstream the multi-stage compressor. The second cooling device is located downstream the mentioned multi-stage compressor. The condensing unit is configured to change the working fluid state with transfer to the supercritical state. The pump is in flowing connection to the condensing unit outlet and is configured to inject the condensed working fluid back into the recuperator. The recuperator is in flowing connection to the heat exchanger, so that the working fluid follows along the closed path. The stated heat recovery system can operate with the relatively large ratio of the recovery cycle pressures, so that it becomes possible to use the cooling media with the lower temperatures and increase the energy efficiency of the heat recovery cycle due to more efficient heat exchange, as well as due to reduction of energy consumption by the pump.

EFFECT: proposed system allows to reduce the unit cost of recovered heat by increasing the thermodynamic efficiency of the heat recovery cycle.

12cl, 8 dwg