Low grade waste heat recovery using diethyl ether thermo-fluid diaphragm engine

Abstract The recovery of low grade waste heat for power generation is getting more attention due to its large magnitude in the industrial sector. Commonly proposed solutions include Organic Rankine Cycle (ORC), transcritical carbon dioxide (T-CO 2 ) cycle and Kalina cycle but with complex architectures. Special type Stirling liquid piston engines such as the Fluidyne and thermo-fluid oscillator can also recover low grade waste heat below 150 °C with simple construction. In this study, a novel two-phase thermo-fluid engine with single chamber and diaphragm was developed and tested experimentally. The engine was characterized at different heat source temperatures ranging from 50 °C up to 100 °C and maximum pressure in the range of 1.2–2 bar. Highest indicated efficiency was 10.3% compared to 25.5% Carnot efficiency with maximum indicated power of 70 W at 10 RPM engine speed. A crankshaft mechanism was installed with flywheel and rope brake dynamometer to measure engine brake power. Maximum brake power measured was about 0.4 W at 8 RPM due to the high friction losses in the power delivery mechanism.

[1]  Christos N. Markides,et al.  Working fluid selection for a two-phase thermofluidic oscillator: Effect of thermodynamic properties , 2014 .

[2]  S. Riffat,et al.  Experimental investigation of a biomass-fired ORC-based micro-CHP for domestic applications , 2012 .

[3]  Vincent Lemort,et al.  Testing and modeling a scroll expander integrated into an Organic Rankine Cycle , 2009 .

[4]  Janusz Kotowicz,et al.  Thermodynamic and economic analysis of a supercritical and an ultracritical oxy-type power plant without and with waste heat recovery , 2016 .

[5]  J. Navarro-Esbrí,et al.  Low GWP alternatives to HFC-245fa in Organic Rankine Cycles for low temperature heat recovery: HCFO-1233zd-E and HFO-1336mzz-Z , 2014 .

[6]  Tzu-Chen Hung,et al.  Experimental study on low-temperature organic Rankine cycle utilizing scroll type expander , 2015 .

[7]  Huaixin Wang,et al.  Power cycles for waste heat recovery from medium to high temperature flue gas sources – from a view of thermodynamic optimization , 2016 .

[8]  Muhammad Imran,et al.  Volumetric expanders for low grade heat and waste heat recovery applications , 2016 .

[9]  Sudipta De,et al.  Thermodynamic modelling of a recompression CO2 power cycle for low temperature waste heat recovery , 2016 .

[10]  Rodolfo Taccani,et al.  Energy efficiency analysis of Organic Rankine Cycles with scroll expanders for cogenerative applications , 2012 .

[11]  Christos N. Markides,et al.  Modelling of a two-phase thermofluidic oscillator for low-grade heat utilisation: Accounting for irreversible thermal losses , 2013 .

[12]  Jan Vierendeels,et al.  New insights in twin screw expander performance for small scale ORC systems from 3D CFD analysis , 2015 .

[13]  Christos N. Markides,et al.  The role of heat exchange on the behaviour of an oscillatory two-phase low-grade heat engine , 2013 .

[14]  Kai Wang,et al.  Stirling cycle engines for recovering low and moderate temperature heat: A review , 2016 .