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Processes 2020, 8, x FOR PEER REVIEW 11 of 23 Processes 2020, 8, 216 11 of 23 ηt and ηre decrease, whereas the optimum compressor inlet pressure increases with the rising of the compressor inlet temperature, which is caused by the special pressure leading to the great ηt and ηre decrease, whereas the optimum compressor inlet pressure increases with the rising of change of the density that increases with the rising of the temperature. For example, the highest ηt the compressor inlet temperature, which is caused by the special pressure leading to the great change are 36.05%, 35.42% and 34.84%, while the compressor inlet temperatures are 32 °C, 35 °C and 38 °C, of the density that increases with the rising of the temperature. For example, the highest ηt are 36.05%, respectively. Meanwhile, the according optimum compressor inlet pressures are 7.55 MPa, 8.0 MPa 35.42% and 34.84%, while the compressor inlet temperatures are 32 ◦C, 35 ◦C and 38 ◦C, respectively. and 8.4 MPa, respectively. The available heat is a fixed value which is only related to the Meanwhile, the according optimum compressor inlet pressures are 7.55 MPa, 8.0 MPa and 8.4 MPa, temperature of the exhaust gas and environmental temperature, so the trend of ηre is same as the respectively. The available heat is a fixed value which is only related to the temperature of the exhaust trend of the net work. However, the denominator of ηt is related to the cold part outlet temperature gas and environmental temperature, so the trend of ηre is same as the trend of the net work. However, of the RCP; the trend of enthalpy in point 6 is similar to the compressor work, which will cause the the denominator of ηt is related to the cold part outlet temperature of the RCP; the trend of enthalpy in maximum ηt to appear in advance. So, it is also found that the optimum compressor inlet pressure point 6 is similar to the compressor work, which will cause the maximum ηt to appear in advance. So, leading to the highest ηt is lower than that leading to the highest ηre. For example, ηre can achieve the it is also found that the optimum compressor inlet pressure leading to the highest ηt is lower than that highest of 18.12% while the compressor inlet temperature is 32 °C and the optimum pressure is 7.65 leading to the highest ηre. For example, ηre can achieve the highest of 18.12% while the compressor MPa. ◦ inlet temperature is 32 C and the optimum pressure is 7.65 MPa. Therefore, the compressor inlet pressure must be higher than the critical pressure to achieve Therefore, the compressor inlet pressure must be higher than the critical pressure to achieve higher higher ηt and ηre. For the ICE exhaust heat recovery, parameter ηre is more important than parameter ηt and ηre. For the ICE exhaust heat recovery, parameter ηre is more important than parameter ηt. So, ηt. So, the optimal inlet conditions are decided to achieve the highest ηre in this paper. When the the optimal inlet conditions are decided to achieve the highest ηre in this paper. When the turbine inlet turbine inlet pressure and temperature are fixed at 25 MPa and 500 °C, the optimal compressor inlet pressure and temperature are fixed at 25 MPa and 500 ◦C, the optimal compressor inlet parameters of parameters of recuperation of the S-CO2 cycle are 7.65 MPa and 32 °C, respectively. recuperation of the S-CO2 cycle are 7.65 MPa and 32 ◦C, respectively. However, ηt and ηre are not only related to the compressor inlet conditions but also related to the However, ηt and ηre are not only related to the compressor inlet conditions but also related to turbine inlet conditions. Figures 12 and 13 give thermal efficiency ηt and exhaust heat recovery ratio the turbine inlet conditions. Figures 12 and 13 give thermal efficiency ηt and exhaust heat recovery ηre for various inlet pressures of the compressor and turbine. It is found that ηt and ηre increase while ratio ηre for various inlet pressures of the compressor and turbine. It is found that ηt and ηre increase the optimal compressor inlet pressure also increases with the turbine inlet pressure, rising from 21 while the optimal compressor inlet pressure also increases with the turbine inlet pressure, rising from MPa to 29 MPa, but increases more and more slower. It is noticed that the isentropic efficiency of the 21 MPa to 29 MPa, but increases more and more slower. It is noticed that the isentropic efficiency of turbine and compressor will decrease with the rising of pressure in actuality. Therefore, the cycle the turbine and compressor will decrease with the rising of pressure in actuality. Therefore, the cycle maximum pressure is limited by many factors which are not considered in this paper. maximum pressure is limited by many factors which are not considered in this paper. Figure 12. Thermal efficiency for the various inlet pressures of the compressor and turbine. Figure 12. Thermal efficiency for the various inlet pressures of the compressor and turbine.PDF Image | Supercritical CO2 Cycle for ICE Waste Heat Recovery
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