ANALYSIS OF THE TRILATERAL FLASH CYCLE AND THE PARTIALLY EVAPORATING CYCLE FOR POWER PRODUCTION FROM LOW TEMPERATURE HEAT SOURCES

摘要

The Trilateral Flash Cycle (TFC) and the Partially Evaporating Cycle (PEC) have been analyzedrnand compared to the Organic Rankine Cycle (ORC). Three cases have been investigated. Case Ⅰ uses air atrn100 ℃, Case Ⅱ air at 150 ℃ and Case Ⅲ air at 200 ℃ as the heat source. Water at 20 ℃ is used as the heatrnsink for all cases. The cycles are optimized for maximum net power production with eight different workingrnfluids, R123, R134a, R245fa, R1234ze, butane, pentane, isopentane and propane. Detailed heat exchangerrnmodels to calculate the pressure drops and heat transfer coefficients are included in the model.rnThe results show that the TFC has the lowest power production for all cases, and the total system size isrnestimated to be larger for the TFC compared to the other cycles. The PEC doesn’t show any advantage overrnthe ORC for the cases analyzed here.