Paper No 325 – Development of LNG Vaporization Systems Applying Hybrid Ground Source Heat Pumps Combined Ground Heat Exchangers with Air-water Heat Exchangers – 13th IEA Heat Pump Conference, Jeju, Korea
In order to reduce the gas consumption in LNG satellite stations, the authors have developed LNG vaporization systems applying hybrid ground source heat pumps (HGSHPs) combined ground heat exchangers (GHEXs) with air-water heat exchangers (AWHEXs). The heat pumps can vaporize the LNG with high efficiency because it is possible to vaporize the LNG by using the low-temperature hot water of around 25oC. The ground source heat pumps (GSHPs) can supply the hot water stably even in the winter season due to no need of defrosting operation. In addition, the HGSHP system with AWHEXs can prevent the decrease of ground temperature due to the excess heat extraction. The authors constructed the field experimental apparatus and carried out the vaporization experiment with a HGSHP. The results indicated that it is possible to vaporize the liquid Nitrogen (Instead of LNG) by using hot water with the temperature of 25oC and the low-temperature hot water supply with GSHP yields the reduction of energy consumption.