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Processes 2020, 8, x FOR PEER REVIEW Processes 2020, 8, 216 Figure 2. Temperature-entropy (T-s) diagram of the recuperation of a S-CO2 cycle. Figure 2. Temperature-entropy (T-s) diagram of the recuperation of a S-CO2 cycle. 4 of 23 Processes 2020, 8, x FOR PEER REVIEW 4 of 23 2.3. Pre-Compression of the S-CO2 Cycle Figure 2. Temperature-entropy (T-s) diagram of the recuperation of a S-CO2 cycle. 2.3. Pre-Compression of the S-CO2 Cycle A single recuperation S-CO2 cycle used for a high temperature heat source cannot fully utilize AsinglerecuperationS-CO cycleusedforahightemperatureheatsourcecannotfullyutilize 2.3. Pre-Compression of the S-CO2 2 Cycle the available waste heat. The turbine exhaust S-CO2 has a low specific heat, while the compressor 4 of 23 the available waste heat. The turbine exhaust S-CO2 has a low specific heat, while the compressor exit S-CO2 has a high specific heat. As a result, there is a big heat transfer temperature difference in A single recuperation S-CO2 cycle used for a high temperature heat source cannot fully utilize exit S-CO2 has a high specific heat. As a result, there is a big heat transfer temperature difference in the recuperator, which will lead to large internal irreversibility. Therefore, the recuperator is the available waste heat. The turbine exhaust S-CO2 has a low specific heat, while the compressor the recuperator, which will lead to large internal irreversibility. Therefore, the recuperator is divided divided into a low temperature recuperator (LTR) and a high temperature recuperator (HTR) in exit S-CO2 has a high specific heat. As a result, there is a big heat transfer temperature difference in into a low temperature recuperator (LTR) and a high temperature recuperator (HTR) in other S-CO2 other S-CO2 cycle layouts. the recuperator, which will lead to large internal irreversibility. Therefore, the recuperator is cycle layouts. Figures 3 and 4 show the layout of the pre-compression S-CO2 cycle and its T-s diagram. The divided into a low temperature recuperator (LTR) and a high temperature recuperator (HTR) in Figures 3 and 4 show the layout of the pre-compression S-CO2 cycle and its T-s diagram. compression is completed in the pre-compressor (PC) and main compressor (MC), successively. The other S-CO2 cycle layouts. The compression is completed in the pre-compressor (PC) and main compressor (MC), successively. working fluid exiting the HTR is compressed from state 3 to state 4 in the PC. Compared to Figures 3 and 4 show the layout of the pre-compression S-CO2 cycle and its T-s diagram. The The working fluid exiting the HTR is compressed from state 3 to state 4 in the PC. Compared to recuperation of the S-CO2 cycle, the working fluid pressure can be adjusted conveniently, because compression is completed in the pre-compressor (PC) and main compressor (MC), successively. The recuperation of the S-CO2 cycle, the working fluid pressure can be adjusted conveniently, because the the pressure of the MC inlet at state 6 can be adjusted by the working fluid pressure of the turbine working fluid exiting the HTR is compressed from state 3 to state 4 in the PC. Compared to pressure of the MC inlet at state 6 can be adjusted by the working fluid pressure of the turbine outlet at outlet at state 2 and the compression ratio. The pressure difference between the heat fluid and cool recuperation of the S-CO2 cycle, the working fluid pressure can be adjusted conveniently, because state 2 and the compression ratio. The pressure difference between the heat fluid and cool fluid in fluid in the LTR can be decreased, which can reduce the pinch point in the heater and decrease the the pressure of the MC inlet at state 6 can be adjusted by the working fluid pressure of the turbine the LTR can be decreased, which can reduce the pinch point in the heater and decrease the internal internal irreversible loss. outlet at state 2 and the compression ratio. The pressure difference between the heat fluid and cool irreversible loss. fluid in the LTR can be decreased, which can reduce the pinch point in the heater and decrease the internal irreversible loss. Figure 3. Operating principle of pre-compression S-CO2 cycle. MC: main compressor, LTR: Fliogwurtem3.peOrpateurraetirnegcupreinractioprl,ePoCf:pre-compressoiornanSd-CHOT2Rc:yhcilgeh.tMemCp:emratiunrecoremcpurpesrsaotro,r.LTR:low temperature recuperator, PC: pre-compressor and HTR: high temperature recuperator. Figure 3. Operating principle of pre-compression S-CO2 cycle. MC: main compressor, LTR: low temperature recuperator, PC: pre-compressor and HTR: high temperature recuperator.PDF Image | Supercritical CO2 Cycle for ICE Waste Heat Recovery
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