ENGINE UNIT WITH COOLING CIRCUIT AND SEPARATE HEAT RECOVERY CIRCUIT Russian patent published in 2011 - IPC F02G5/04 F01P3/20 F02B37/13 

FIELD: engines and pumps.

SUBSTANCE: engine unit includes internal combustion engine (1) with two-stage turbo-supercharge, supercharging air supply system, exit gas discharge system and cooling system. Exit gas discharge system has exit gas neutralisation system (5). Cooling system has cooling circuit (10) and heat recovery circuit (11) hydraulically isolated from it. Cooling circuit (10) includes two partial cooling circuits (10/1, 10/2) either hydraulically connected to each other or isolated from each other. Inside cooling circuit (10) the cooling medium circulation is provided at least by means of one pump (12). In the first (10/1) and the second (10/2) circuits there located are heat exchangers (13, 16) cooled with ambient air. Inside recovery circuit (11) the working medium circulation is provided at increased pressure at least by means of one pump (17). After pump (17) the working medium is separated into two parallel partial flows. In heat exchangers (18, 19) phase change of working medium from liquid to vaporous state is performed. In the first parallel branch (11a) change is performed in exit gas recirculation heat exchanger (18). In the second parallel branch (11b) change is performed in exit gas heat exchanger (19). Vaporous working medium is supplied to expansion tank (21) and is converted by means of the latter to mechanical net energy. After expansion tank (21) the working medium is supplied through cooled condenser (20) and is supplied again to circuit (11) in liquid state by means of pump (17).

EFFECT: effective cooling of internal combustion engine, supercharging air and recirculating exit gas, and high-efficiency heat recovery.

27 cl, 10 dwg