Hydraulic Diaphragm Metering Experiment
Yang et al. used the experimental performance of a hydraulic diaphragm metering pump to estimate its influence on ORC WHR behavior [ATE 132 (2018) 605-612]. Using R123 as a working fluid, the power input, actual efficiency, and mass flow rate were investigated for varying outlet pressure. From this data, ORC performance was simulated to determine how such parameters would influence the ORC. Subsequently, the mass flow rate of the pump was independent of pressure, whereas the actual pump efficiency increased nonlinearly with outlet pressure. Furthermore, a maximum efficiency of the pump of 88.27% was obtained for an outlet pressure of 1.33 MPa and a mass flow rate of 2.06 t/h. As the outlet pressure increased, the power input of the pump also rose from 207.12 W to 523.91 W. Moreover, the ORC system consistently achieved thermal efficiencies over 10% for strokes from 25-100%, while significantly affecting net power output, however both the thermal efficiency and net power output increased as the evaporating temperature increased. While further experimental investigation should be completed, …show more content…
explored the different cycles used in low- and medium-grade waste heat recovery, comparing them based on their efficiencies [RSER 81 (2018) 760-767]. Many different thermodynamic cycles, including basic ORC, regenerative ORC, cascade ORC, organic flash cycles, and trilateral cycles have been considered for WHR. In a trilateral cycle, linear work is generated within a controlled piston due to the thermal energy absorbed by a heat exchanger. Based on efficiency values from the literature, the ORC configurations achieved cycle efficiencies between 5-10%, while trilateral cycles achieved efficiencies between 30-50%. Furthermore, the topping and bottoming temperatures in the proposed trilateral cycles were much lower than those considered in the ORCs were, which, when taken into consideration, further improved the thermodynamic performance of trilateral cycles over
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