US 12,270,319 B2
System and a method for generating mechanical power using super critical carbon dioxide
Pramod Kumar, Bangalore (IN); and Siddhant Karmarkar, Bangalore (IN)
Assigned to INDIAN INSTITUTE OF SCIENCE, Bangalore (IN)
Appl. No. 18/553,951
Filed by INDIAN INSTITUTE OF SCIENCE, Bangalore (IN)
PCT Filed Apr. 5, 2022, PCT No. PCT/IB2022/053138
§ 371(c)(1), (2) Date Oct. 4, 2023,
PCT Pub. No. WO2022/214945, PCT Pub. Date Oct. 13, 2022.
Claims priority of application No. 202141016852 (IN), filed on Apr. 9, 2021.
Prior Publication US 2024/0209757 A1, Jun. 27, 2024
Int. Cl. F01K 25/10 (2006.01); F01K 7/32 (2006.01)
CPC F01K 25/103 (2013.01) [F01K 7/32 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A system for generating mechanical power using super critical carbon dioxide (sCO2), the system comprising:
at least one expansion cylinder (5) defining a first internal volume (V1), the expansion cylinder (5) houses a first piston (5a) connected to a crankshaft (7) through a first connecting rod (5c), wherein the expansion cylinder (5) is defined with one or more inlet ports (5i) and one or more outlet ports (5o);at least one compression cylinder (6) defining a second internal volume (V2), the compression cylinder (6) houses a second piston (6a) connected to the crankshaft (7) through a second connecting rod (6c), wherein the at least one compression cylinder (6) is defined with one or more inlet ports (6i) and one or more outlet ports (5o);
wherein the inlet ports (5i) of the at least one expansion cylinder (5) are each provided with one or more inlet valves (5iv) and the outlet ports (5o) of the at least one expansion cylinder (5) are each provided with one or more outlet valves (5ov);
wherein, the first internal volume (V1) of the at least one expansion cylinder (5) is greater than the second internal volume (V2) of the at least one compression cylinder (6);
a first heat exchanger (C) fluidically connected to the inlet ports (6i) of the at least one compression cylinder (6) and the outlet ports (60) of the at least one expansion cylinder (5);
a second heat exchanger (H) fluidically connected to the outlet ports (60) of the at least one compression cylinder (6) and the inlet ports (5i) of the at least one expansion cylinder (5); and
a third heat exchanger (R) fluidly connecting the at least one compression cylinder (6) to the first heat exchanger (H) and the at least one expansion cylinder (5) to the second heat exchanger (C),
wherein the inlet ports (5i) of the at least one expansion cylinder (5) are fluidly connected to a first end (HI) of the second heat exchanger (H) and the outlet ports (5o) of the expansion cylinder (5) are fluidically connected to a first end (R1) of the third heat exchanger (R);
wherein, the first heat exchanger (C) is configured to cool CO2 received from the outlet ports (So) of the at least one expansion cylinder (5), and the at least one compression cylinder (6) pressurizes the CO2 cooled by the first heat exchanger (C);
wherein, the second heat exchanger (H) is configured to heat the CO2 received from the outlet ports (6o) of the at least one compression cylinder (6) and supply to the inlet ports (Si) of the at least one expansion cylinder (5);
wherein, the third heat exchanger (R) is configured to recuperate heat from the CO2 received from the outlet ports (5o) of the at least one expansion cylinder (5) and supplied to the first heat exchanger;
wherein the inlet valves (5iv) of the at least one expansion cylinder (5) are configured to open when the first piston (5a) traverses down from a top dead center of the expansion cylinder (5) and the inlet valves (5iv) of the at least one expansion cylinder (5) are configured to close before the first piston (5a) is at a bottom dead center of the expansion cylinder (5);
wherein the outlet valves (5ov) of the at least one expansion cylinder (5) are configured to open when the first piston (5a) traverses from the bottom dead center of the expansion cylinder to the top dead center of the expansion cylinder (5) and the outlet valves (5ov) of the at least one expansion cylinder (5) are configured to close when the first piston (5a) is at the top dead center of the expansion cylinder (5); and
high temperature and high-pressure CO2 drives the first piston (5a) housed inside the expansion cylinder (5) downwards to generate mechanical energy in the at least one expansion cylinder (5).