Thermal performance analysis of intermediate fluid vaporizer for liquefied natural gas

Thermodynamic analysis of direct expansion configurations for electricity production by LNG cold energy recovery

“…4, the available cooling capacity is non-isothermal, which implies a not perfect match in the heat transfer with the condenser of the Rankine cycle. The conventional values for the energy recovery obtained with Rankine cycle can be estimated in the range between 40 and 120 kJ/kg, using conventional schemes [8,9]. For practical LNG cold power generation, ORC is most commonly proposed, sometimes using different configurations such as a binary mixture as working fluid and combined with a vapor absorption process or using a cascading mode; in this way the output power can overcome the value of 200 kJ/kg [24].…”

“…There are several ways using the energy given off by LNG regasification to complete thermodynamic cycle to generate power: they basically belong to three particular options. The methods discussed in the literature are direct expansion cycle schemes [4,5]; Organic Rankine Cycle (ORC) with intervening media or more complex cascading Rankine cycle configurations [8,9]. While the direct expansion cycle directly uses LNG as working fluid for expansion in turbine, ORC uses seawater as the primary heat source and LNG as the heat sink with an auxiliary working fluid (usually a low boiling hydrocarbon) for power production in turbine.…”

Thermodynamic analysis for working fluids comparison in Rankine-type cycles exploiting the cryogenic exergy in Liquefied Natural Gas (LNG) regasification

“…Various configurations of RTC have been proposed: coupled to direct expansion [9], in cascade and combination with a Brayton cycle [1,4,[10][11][12][13][14]. Propane is the pure hydrocarbon most used as the working fluid in RTC for current application [1,2,9,[15][16][17], while in reference [1] ethane and ethene are put forth as the most suitable working fluids for low temperature RTC. Studies on mixtures such as ammonia-water as a working fluid in RTC cycles [4,18] have also been reported.…”

Theoretical and computational analyses of LNG evaporator

“…Besides, IFVs are also superior over other vaporizers for transportable re-gasification units and waste heat recovery units [2]. Some recent investigations in the IFVs can be found in literature [2][3][4][5].…”