饱和蒸汽Y=0.6358+0.00499*(压力范围0~15000KPA）Y=0.6246+0.00505*(压力范围0~10000KPA)以上压力均为表压过热蒸汽密度：MD=(19.44*P)/(T-0.151*P+2.1627)P为绝压（MPA),T为温度，MD密度（KG/M3)
Y=0.6358+0.00499*(压力范围0~15000KPA）
Y=0.6246+0.00505*(压力范围0~10000KPA)
以上压力均为表压
过热蒸汽密度：
MD=(19.44*P)/(T-0.151*P+2.1627)
P为绝压（MPA),T为温度，MD密度（KG/M3)
