The role of heat exchange on the behaviour of an oscillatory two-phase low-grade heat engine

2013 ◽  
Vol 53 (2) ◽  
pp. 177-187 ◽  
Author(s):  
Roochi Solanki ◽  
Amparo Galindo ◽  
Christos N. Markides
Keyword(s):  
Heat Exchange ◽  
Heat Engine ◽  
Low Grade ◽  
Two Phase ◽  
Low Grade Heat

Modelling of a two-phase thermofluidic oscillator for low-grade heat utilisation: Accounting for irreversible thermal losses

2013 ◽  
Vol 106 ◽  
pp. 337-354 ◽  
Author(s):  
Roochi Solanki ◽  
Richard Mathie ◽  
Amparo Galindo ◽  
Christos N. Markides
Keyword(s):  
Low Grade ◽  
Two Phase ◽  
Low Grade Heat

scholarly journals Influence of evaporating rate on two-phase expansion in the piston expander with cyclone separator

2020 ◽  
Vol 24 (3 Part B) ◽  
pp. 2077-2088 ◽  
Author(s):  
Weifeng Wu ◽  
Qi Wang ◽  
Zhao Zhang ◽  
Zhijun Wu ◽  
Xiaotian Yang ◽  
...  
Keyword(s):  
Low Grade ◽  
Cyclone Separator ◽  
Expansion Process ◽  
Two Phase ◽  
Kalina Cycle ◽  
Thermodynamic Cycles ◽  
Heat Utilization ◽  
Inlet Stream ◽  
Organic Rankine Cycles ◽  
Low Grade Heat

The trilateral flash cycle shows a greater potentiality in moderate to low grade heat utilization systems due to its potentiality of obtaining high exergy efficiency, compared to the conventional thermodynamic cycles such as the organic Rankine cycles and the Kalina cycle. The main difference between the trilateral flash cycle and the conventional thermodynamic cycles is that the superheated vapor expansion process is replaced by the two-phase expansion process. The two-phase expansion process actually consists of a flashing of the inlet stream into a vapor and a liquid phase. Most simulations assume an equilibrium model with an instantaneous flashing. Yet, the experiments of pool flashing indicate that there is a flash evaporating rate. The mechanism of this process still remains unclear. In this paper, the flash evaporating rate is introduced into the model of the two-phase expansion process in the reciprocating expander with a cyclone separator. As such, the obtained results reveal the influence of evaporating rate on the efficiency of the two-phase expander.

Converting Low-Grade Heat Into Power Using a Supercritical Rankine Cycle With Zeotropic Mixture Working Fluid

2010 ◽  
Author(s):  
Huijuan Chen ◽  
D. Yogi Goswami ◽  
Muhammad M. Rahman ◽  
Elias K. Stefanakos
Keyword(s):  
Rankine Cycle ◽  
Phase Region ◽  
Working Fluid ◽  
Condensation Process ◽  
Heating Process ◽  
Low Grade ◽  
Two Phase ◽  
Working Fluids ◽  
Zeotropic Mixture ◽  
Low Grade Heat

A supercritical Rankine cycle using zeotropic mixture working fluids for the conversion of low-grade heat into power is proposed and analyzed in this paper. A supercritical Rankine cycle does not go through two-phase region during the heating process. By adopting zeotropic mixtures as the working fluids, the condensation process happens non-isothermally. Both of the features create a potential in reducing the irreversibility and improving the system efficiency. A comparative study between an organic Rankine cycle and the proposed supercritical Rankine cycle shows that the proposed cycle improves the cycle thermal efficiency, exergy efficiency of the heating and the condensation processes, and the system overall efficiency.

Thermolytic osmotic heat engine for low-grade heat harvesting: Thermodynamic investigation and potential application exploration

2020 ◽  
Vol 259 ◽  
pp. 114192
Author(s):  
Xin Tong ◽  
Su Liu ◽  
Junchen Yan ◽  
Osvaldo A. Broesicke ◽  
Yongsheng Chen ◽  
...  
Keyword(s):  
Potential Application ◽  
Heat Engine ◽  
Low Grade ◽  
Thermodynamic Investigation ◽  
Low Grade Heat

Membrane-Based Osmotic Heat Engine with Organic Solvent for Enhanced Power Generation from Low-Grade Heat

2015 ◽  
Vol 49 (9) ◽  
pp. 5820-5827 ◽  
Author(s):  
Evyatar Shaulsky ◽  
Chanhee Boo ◽  
Shihong Lin ◽  
Menachem Elimelech
Keyword(s):  
Power Generation ◽  
Organic Solvent ◽  
Heat Engine ◽  
Low Grade ◽  
Low Grade Heat

scholarly journals Thermodynamic Performance and Optimization Analysis of a Modified Organic Flash Cycle for the Recovery of Low-Grade Heat

Energies ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 442 ◽  
Author(s):  
Kyoung Kim
Keyword(s):  
Working Fluid ◽  
Low Grade ◽  
Flash Temperature ◽  
Input Unit ◽  
Optimization Analysis ◽  
Two Phase ◽  
Thermodynamic Performance ◽  
Efficient Recovery ◽  
Performance Results ◽  
Low Grade Heat

The recently proposed organic flash cycle (OFC) has the potential for the efficient recovery of low-grade heat, mainly due to the reduction of irreversibilities in the heat input unit. In the present study, a modified OFC (OFCM) employing a two-phase expander (TPE) and regeneration is proposed and thermodynamic and optimization analysis on this cycle is conducted compared with the basic OFC (OFCB). Six substances are considered as the working fluids. Influences of flash temperature, source temperature, and working fluid are systemically investigated on the system performance. Results showed that OFCM is superior to OFCB in the aspects of power production, thermal, and second-law efficiencies.

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