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The catalytic hydropyrolysis and co-hydropyrolysis of algae (microalgae and macroalgae) and used engine oil (UEO) for the production of potential fuels for automobiles were examined. The co-hydropyrolysis of algae and UEO produced oils that possessed slightly higher H and C content, a higher H/C atomic ratio, and an extensively reduced heteroatom (59.78–75.62% for O, 6.98–81.65 for N, and 43.30–86...
Recovering cold energy generated in the regasification process of liquefied natural gas (LNG) can help to improve the energy efficiency of LNG power generation systems, meanwhile, abundant low-grade waste heat can also be exploited from the exhaust gas of gas turbines. This study proposes to apply the thermoacoustic Stirling electric generator to recover LNG cold energy and waste heat simultaneously...
TWTEG (traveling-wave thermoacoustic electric generator) is promising in efficiently converting the heat of fuel combustion, solar energy, industrial waste heat, etc. into electricity with a very scalable power output. Based on the decoupling method and theoretical analysis, the acoustic impedance requirements of the TWTE (traveling-wave thermoacoustic engine) and LAs (linear alternators) to reach...
A thermoacoustic compressor is capable of converting an alternating gas flow to a direct one with a large pumping rate on the basis of the pressure oscillation nature of thermoacoustic engines and the flow rectification effect of check valves. Theoretical calculations are first carried out to study the factors that affect the performance of the closed and open thermoacoustic compression systems. It...
A three-dimensional finite element thermal model for the stackable supercapacitor is built and tested at 3 A constant current in charge–discharge process, and then we analyze the inner temperature distribution field. It can be concluded that the maximum temperature appears in core. The maximum temperature will rise to 34.5 °C after 30 cycles and 37.6 °C in steady state. Cooling measurements should...
The major obstacle to biodiesel commercialization is the high cost of biodiesel. Biodiesel made from waste cooking oil is an economical source that can effectively reduce raw material cost. Although using a microwave heating system to improve the yields of waste-cooking-oil biodiesel has received little attention in the literature, experimental results indicate that it outperforms conventional heating,...
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