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Processes 2020, 8, x FOR PEER REVIEW 3 of 23 cycle, split-flow recompression S-CO2 cycle and split-flow expansion S-CO2 cycle, and their Processes 2020, 8, 216 operating principle was introduced in the following section. Table 1. Main parameters of the internal combustion engine (ICE). Table 1. Main parameters of the internal combustion engine (ICE). 3 of 23 2.2. Recuperation S-CO2 Cycle Exhaust temperature Exhaust mass flow Parameter Values Parameter Values Power output Torque 235.8 kW 1500 Nm Power output 235.8 kW Fuel consumption 47.79 kg/h Torque 1500 Nm Combustion air mass flow 943 kg/h Fuel consumption 47.79 kg/h 519 °C Exhaust temperature 943 kg/h 990.79 kg/h Combustion air mass flow Exhaust mass flow 519 ◦C 990.79 kg/h 2.2. ReTchuepeorapteiornatSin-CgOpriCnycicplele and temperature-entropy (T-s) diagram of recuperation of the S-CO2 2 cycle were shown in Figures 1 and 2, respectively. The cycle consisted of five main devices: The operating principle and temperature-entropy (T-s) diagram of recuperation of the S-CO2 cycle compressor (CP), recuperator (RCP), heater, turbine (TB) and cooler (C). For the ICE exhaust gas, were shown in Figures 1 and 2, respectively. The cycle consisted of five main devices: compressor (CP), the hot from the ICE rejects heat in the heater and then discharges it to the atmosphere. The recuperator (RCP), heater, turbine (TB) and cooler (C). For the ICE exhaust gas, the hot from the ICE temperature of the exhaust decreases from Tg,in to Tg,out. The S-CO2 cycle can be identified as rejects heat in the heater and then discharges it to the atmosphere. The temperature of the exhaust 1-2-3-4-5-6-1 and described as follows: generated high-pressure S-CO2 (point 1) in the heater flows decreases from Tg,in to Tg,out. The S-CO2 cycle can be identified as 1-2-3-4-5-6-1 and described as into the turbine, and its enthalpy is converted into output power. The process 1 to 2 means an follows: generated high-pressure S-CO2 (point 1) in the heater flows into the turbine, and its enthalpy isentropic expansion, which is ideal and impossible. The real expansion process in the turbine is is converted into output power. The process 1 to 2 means an isentropic expansion, which is ideal and process 1 to 2. The low-pressure CO2 (point 2) discharged from the turbine flows into the impossible. The real expansion process in the turbine is process 1 to 2. The low-pressure CO2 (point recuperator, where it rejects heat to cold working fluid. Then, the CO2 (point 3) flows into the cooler, 2) discharged from the turbine flows into the recuperator, where it rejects heat to cold working fluid. where it is cooled by supplied cooling water. The low temperature CO2 (point 4) is compressed into Then, the CO2 (point 3) flows into the cooler, where it is cooled by supplied cooling water. The low high-pressure gas (point 5) by the compressor. High pressure CO2 flows into the recuperator, where temperature CO2 (point 4) is compressed into high-pressure gas (point 5) by the compressor. High it is preheated to a medium temperature (point 6) and then flows into the heater, where it is heated pressure CO2 flows into the recuperator, where it is preheated to a medium temperature (point 6) and to a high temperature (point 1) by the ICE exhaust. then flows into the heater, where it is heated to a high temperature (point 1) by the ICE exhaust. Figure 1. Operating principle of the recuperation of a supercritical-CO2 (S-CO2) cycle. ICE: inFtiegrunraelc1o.mObpuersatitoingenpgrincei,pRleCoPf:rtheceurpeecruaptoer,aTtiBon:tuorfbainseupanerdcrTiticala-nCdOT2 (S-C:Ote2)mcpyecrlea.tuICreEi:nicnrtearsneal g,in g,out ancodmdbeucrsetiaosne. engine, RCP: recuperator, TB: turbine and Tg,in and Tg,out: temperature increase and decrease.PDF Image | Supercritical CO2 Cycle for ICE Waste Heat Recovery
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