TY - GEN
T1 - DYNAMIC EXERGY ANALYSIS OF A RECUPERATIVE DUAL-PRESSURE ORC DRIVEN BY WASTE HEAT
AU - Jiang, Nan
AU - Du, Yang
AU - Cheng, Kang
AU - Fan, Gang
AU - Wang, Jiangfeng
AU - Zhao, Pan
AU - Dai, Yiping
N1 - Publisher Copyright:
© 2021, Knowledge Center on Organic Rankine Cycle Technology (KCORC). All Rights Reserved.
PY - 2021
Y1 - 2021
N2 - To absorb the waste heat from low-temperature heat source more effectively, an ORC system is proposed. Compared with the traditional ORC system, an evaporator and a recuperator is added to the cycle. It is driven by the waste heat of solid bulk, R1234ze(E) is chosen as the working fluid. To study the dynamic characteristics of the system, disturbance is applied to the hot air inlet temperature. The results indicate that under 10℃ step decrease of hot air inlet temperature, the exergy efficiency of three heat exchangers all rises to the peak first, and then gradually declines. Compared with the initial state, the exergy efficiency of the high-pressure evaporator (HPE) increases the most in the end, which is 1.07%. Both high-pressure evaporator and low-pressure evaporator (LPE) take 700 seconds to return to steady state, while the recuperator only takes about 200 seconds. The exergy efficiencies of turbine, HPE and LPE drop directly when the disturbance occurs. The turbine exergy efficiency has a decline of 0.52%, from 81.1% to 80.58%. The system exergy efficiency firstly jumps from 35.67% to 43.28% and then slowly decreases to 34.65%.
AB - To absorb the waste heat from low-temperature heat source more effectively, an ORC system is proposed. Compared with the traditional ORC system, an evaporator and a recuperator is added to the cycle. It is driven by the waste heat of solid bulk, R1234ze(E) is chosen as the working fluid. To study the dynamic characteristics of the system, disturbance is applied to the hot air inlet temperature. The results indicate that under 10℃ step decrease of hot air inlet temperature, the exergy efficiency of three heat exchangers all rises to the peak first, and then gradually declines. Compared with the initial state, the exergy efficiency of the high-pressure evaporator (HPE) increases the most in the end, which is 1.07%. Both high-pressure evaporator and low-pressure evaporator (LPE) take 700 seconds to return to steady state, while the recuperator only takes about 200 seconds. The exergy efficiencies of turbine, HPE and LPE drop directly when the disturbance occurs. The turbine exergy efficiency has a decline of 0.52%, from 81.1% to 80.58%. The system exergy efficiency firstly jumps from 35.67% to 43.28% and then slowly decreases to 34.65%.
KW - dual-pressure ORC
KW - dynamic analysis
KW - exergy efficiency
KW - finite volume method
UR - https://www.scopus.com/pages/publications/85143425767
M3 - 会议稿件
AN - SCOPUS:85143425767
SN - 9783000706868
T3 - International Seminar on ORC Power Systems
BT - Proceedings of the 6th International Seminar on ORC Power Systems, 2021
A2 - Wieland, Christoph
A2 - Karellas, Sotirios
A2 - Quoilin, Sylvain
A2 - Schifflechner, Christopher
A2 - Dawo, Fabian
A2 - Spliethoff, Hartmut
PB - Knowledge Center on Organic Rankine Cycle Technology (KCORC)
T2 - 6th International Seminar on ORC Power Systems, ORC 2021
Y2 - 11 October 2021 through 13 October 2021
ER -
