Patent EP-3051230-A1 (EP)
Inventor: STAICOVICI MIHAIL-DAN
IPC: F25B40/00
Filed: 2015-01-29
Abstract: An absorption cooling cycle plant is integrating in its structure a Rankine cycle plant, giving birth to the Cooling Rankine Absorption Cycle based plant, in short CRAC. A high pressure generator (1), connected to the external heat source (2), is supplied by the rich absorbent (3) and generates the refrigerant vapor (10), which is rectified with the help of the sink source (9). A fraction (11) of the rectified refrigerant vapor (10) passes through the 3-way valve (12) and enters the high pressure cooling cycle plant condenser (13) where is condensed by the external sink source (14) and is stored in the refrigerant storage tank (15). The refrigerant condensate (16), coming of the storage tank (15), is subcooled, subsequently it passes through the 3-way valve (21), it is expanded from the high pressure to the low pressure in the expansion valve (22) and enters the low pressure cooling cycle plant evaporator (19), where it evaporates and produces useful cooling effect. Further on, the not evaporated refrigerant (26) is stored in the storage tank (25) and then is evacuated and enters the essentially same low pressure absorber (4), namely the absorber reservoir (27). The plant single stage cooling cycle closes when the refrigerant vapor (18), coming of the cooling cycle plant evaporator (19), is superheated in the subcooler (17) and then enters the low pressure absorber (4), where is absorbed by the poor absorbent (7) and where the absorption process heat is evacuated with the help of the sink source (28). The Rankine cycle plant is supplied by the rectified vapor (29), complementary with vapor (11), both coming of the rectified vapor (10). The vapor (29) is superheated in the superheater (30) with the help of the heat source (31) and becomes superheated vapor (32). Subsequently, the vapor (32) is expanded in the turbogenerator 33() and produces useful electricity or work, then exits from the turbogenerator (33) as vapor (34) with an intermediate pressure, established by the expansion valve (35). Further, the vapor (34) is condensed in the coil (36) of the Rankine cycle plant intermediary pressure condenser (20) at a temperature close to that of the evaporation temperature, achieved by refrigerant (16) of the cooling cycle, which passes through the 3-way valve (21), it expands with the expansion valve (37), it evaporates in the Rankine cycle plant condenser (20) on the coil (36) external surface and the resulting vapor is superheated in the subcooler (17), it is absorbed in the absorber (4) and the not evaporated part is stored in the storage tank (25). Further on, the vapor (34) condensed in the coil (36) is stored in the liquid storage tank (38), is pumped with the help of the pump (39) through the pipe (40) from the intermediate pressure till the high pressure of the cooling cycle condenser (13) and is mixed up with the refrigerant condensate in the condenser reservoir (15), in order to close the Rankine cycle plant and the CRAC. Within the frame of the invention, the individual CRAC plants are connected in thermal cascades, supplied by a sensible or latent heat sources, by a sink source and by a source to be cooled, in order to build multi-effect working/cooling cycle based plants.