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车用天然气燃料中，液化天然气（LNG）具有压力不高、能量密度大、续驶里程长的优点，是理想的车用燃料。随着各大城市天然气的液化储存和进口LNG终端站的建立，国内液化天然气汽车（LNGV）已渐渐从试验阶段走向商业应用，随着LNGV的推广，LNG冷量利用已被提上了研究日程。通过火用分析方法，研究了现在的LNGV的火用损失；提出了车用LNG冷量利用的2种方式：动力利用和制冷利用，并对此进行了热力分析和技术问题的探讨。

DISCUSSION ON METHODS TO USE LNG’S CRYOGENIC ENERGY OF LNGV 1)

Liquefied natural gas (LNG), as a vehicle fuel, has the advantages of low pressure, big energy density, and long driving distance. It is an ideal vehicle fuel. As the LNG is stored and the terminal stations of imported LNG are established in every big city of China, the LNG vehicles have been put to commercial use from experiments. With popularization of LNG vehicles, the use of LNG’s cryogenic energy is under research. With enthalpy analysis, the enthalpy loss of resent LNG vehicles is investigated. Two ways to use LNG’s cryogenic energy are proposed, i.e. power used and refrigeration-used. Also, the thermal analysis and the discussion of technical problems are conducted.