A system for converting thermal energy to work, comprising: a working fluid circuit containing a working fluid; a pump fluidly coupled to the working fluid circuit and configured to circulate the working fluid throughout the working fluid circuit, the working fluid circuit being configured to separate the working fluid into a first mass flow (m 1) and a second mass flow (m 2) downstream from the pump, and wherein an inlet of the pump receives both the first mass flow (m 1) and the second mass flow (m 2); a first heat exchanger fluidly coupled to the pump via the working fluid circuit and configured to be in thermal communication with a heat source, the first heat exchanger being configured to receive the first mass flow (m 1) and configured to transfer thermal energy from the heat source to the first mass flow (m 1); a first turbine fluidly coupled to the first heat exchanger via the working fluid circuit and configured to expand the first mass flow (m 1); a first recuperator fluidly coupled to the first turbine via the working fluid circuit and configured to transfer residual thermal energy from the first mass flow (m 1) discharged from the first turbine to the first mass flow (m 1) directed to the first heat exchanger; a second heat exchanger fluidly coupled to the pump via the working fluid circuit and configured to be in thermal communication with the heat source, the second heat exchanger being configured to receive the second mass flow (m 2) and configured to transfer thermal energy from the heat source to the second mass flow (m 2); a second turbine fluidly coupled to the second heat exchanger via the working fluid circuit and configured to expand the second mass flow (m 2); the system is characterized in that the second mass flow (m 2) is discharged from the second turbine and re-combined with the first mass flow (m 1) to generate a combined mass flow (m 1 +m 2); and in that the system further comprises a second recuperator fluidly coupled to the second turbine via the working fluid circuit and configured to transfer residual thermal energy from the combined mass flow (m 1 +m 2) to the second mass flow (m 2) directed to the second heat exchanger; a third heat exchanger in thermal communication with the heat source and fluidly arranged between the pump and the first heat exchanger via the working fluid circuit, the third heat exchanger being configured to receive and transfer thermal energy to the first mass flow (m 1) upstream of the first heat exchanger, and wherein the first heat exchanger, the second heat exchanger, and the third heat exchanger are fluidly arranged in series in the heat source; and a condenser fluidly coupled to the first recuperator, the second turbine, and the pump via the working fluid circuit and configured to transfer thermal energy from the first and second mass flows (m 1,m 2). a working fluid circuit containing a working fluid; a pump fluidly coupled to the working fluid circuit and configured to circulate the working fluid throughout the working fluid circuit, the working fluid circuit being configured to separate the working fluid into a first mass flow (m 1) and a second mass flow (m 2) downstream from the pump, and wherein an inlet of the pump receives both the first mass flow (m 1) and the second mass flow (m 2); a first heat exchanger fluidly coupled to the pump via the working fluid circuit and configured to be in thermal communication with a heat source, the first heat exchanger being configured to receive the first mass flow (m 1) and configured to transfer thermal energy from the heat source to the first mass flow (m 1); a first turbine fluidly coupled to the first heat exchanger via the working fluid circuit and configured to expand the first mass flow (m 1); a first recuperator fluidly coupled to the first turbine via the working fluid circuit and configured to transfer residual thermal energy from the first mass flow (m 1) discharged from the first turbine to the first mass flow (m 1) directed to the first heat exchanger; a second heat exchanger fluidly coupled to the pump via the working fluid circuit and configured to be in thermal communication with the heat source, the second heat exchanger being configured to receive the second mass flow (m 2) and configured to transfer thermal energy from the heat source to the second mass flow (m 2); a second turbine fluidly coupled to the second heat exchanger via the working fluid circuit and configured to expand the second mass flow (m 2); the system is characterized in that the second mass flow (m 2) is discharged from the second turbine and re-combined with the first mass flow (m 1) to generate a combined mass flow (m 1 +m 2); and in that the system further comprises a second recuperator fluidly coupled to the second turbine via the working fluid circuit and configured to transfer residual thermal energy from the combined mass flow (m 1 +m 2) to the second mass flow (m 2) directed to the second heat exchanger; a third heat exchanger in thermal communication with the heat source and fluidly arranged between the pump and the first heat exchanger via the working fluid circuit, the third heat exchanger being configured to receive and transfer thermal energy to the first mass flow (m 1) upstream of the first heat exchanger, and wherein the first heat exchanger, the second heat exchanger, and the third heat exchanger are fluidly arranged in series in the heat source; and a condenser fluidly coupled to the first recuperator, the second turbine, and the pump via the working fluid circuit and configured to transfer thermal energy from the first and second mass flows (m 1,m 2).