首页|Performance investigation of a novel thermosyphon based trilateral cycle using hydraulic turbine for power generation instead of two-phase expander
Performance investigation of a novel thermosyphon based trilateral cycle using hydraulic turbine for power generation instead of two-phase expander
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NSTL
Elsevier
The trilateral cycle (TLC) has been viewed as a promising technology for low grade heat to power conversion， while its application in reality is greatly limited by the low efficiency of two-phase expander and high volume flow rate at the expander outlet。 This paper suggests a novel thermosyphon based trilateral cycle (TTLC)， which uses hydraulic turbine for power generation instead of two-phase expander， avoiding problems in traditional TLC systems and also providing a chance for utilization of pump-as-turbine (PAT) technologies。 Thermodynamic model of the novel system is developed， as well as the two-phase flow model for the riser。 The system performance of TTLC is investigated based on the first law analysis and the second law analysis， and the results are compared with those of traditional TLC and organic Rankine cycle (ORC)。 It is found that the extra gravitational pressure drop is the main contributor to the riser efficiency。 The working fluids with smaller density ratio and specific heat are more suitable for the proposed system， such as R502， R218， R125 and R115。 Increasing heat source temperature is more efficient in energy conversion than decreasing sink temperature for the TTLC system， which generates marginally more power than TLC when the heat source temperature is less than 50 °C， and less power than TLC within the deviation of 10% for the heat source temperature in the range of 50–75 °C。 The traditional ORC has the worst performance due to its bad temperature matching。 Moreover， the volume flow rate at the turbine outlet of TTLC is only 2–17% of those for TLC and ORC， indicating a much smaller turbine size。
Low grade heatPower cyclePump as turbineTrilateral cycleTwo-phase thermosyphon loop
Wang L.、Li B.、Chu Z.
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College of Civil Engineering Zhejiang Sci-Tech University
NSTL
Elsevier
