| Boiling Temp |
77.35 K @1atm
76.67 K @0.92atm(Tucson)
73.00 K @0.58atm(Maunakea) |
| Liquid Density |
0.808 kg/L @77K |
| Specific heat of Liquid |
2.042 J/gK @77K |
| Specific heat of Gas |
1.072 J/gK @100K
1.046 J/gK @200K
1.041 J/gK @300K |
| Latent Heat |
Evaporative latent heat @boiling temp 199.1 kJ/kg |
| Sensible Heat from boiling temp to 300K |
233.8 kJ/kg |
Consumption for metal coolingTarget Temperature 77K
Initial Temperature 300K |
----Latent Heat Only
| Aluminum | 1.0 L/kg |
| Stainless | 0.53 L/kg |
| Copper | 0.46 L/kg |
----Latent Heat + Sensible Heat
| Aluminum | 0.63 L/kg |
| Stainless | 0.33 L/kg |
| Copper | 0.28 L/kg |
|
Total Energy
from gas -> evapolate -> 300K gas |
437 J/g |
| Empirically Estimated Steam Pressure |
Log(P)＝6.49594-255.821/(T-66.600) |
| Coefficient of Thermal Conductivity |
gas (273K, 1atm) 24×10-3 W/mK
gas (@boiling temp) 7.5×10-3 W/mK
liquid (@boiling temp) 139.8×10-3 W/mK |
| Cost @Hilo (as of 2003) |
$2/L |