====== Cooling data ======

===== Water =====

Water is generally 16°c in and 20°c out for air cooling. Some site still use low temperature water, between 6°c to 12°c, but this often result with condensation and energy losses.\\
Warm water is generally 40°c in and 50-60°c out for direct water cooling equipments.

Water specs:

^Formulae^Melting point^Boiling point^Heat Capacity^Viscosity^Density^Electrical conductivity (pure water at 25°c)^
|H2O|0.00°C (32.00°F; 273.15K)|100°C (212°F; 373K)|4.1818 J/(g·K)|8.90×10−4 Pa·s|998.2 kg/m3|0.055 µS/cm|

==== Hydraulic ====

Correspondence table between country units:

{{ :datacenter:cooling:dn-in-mm-table.png |}}

==== Vapor =====

In french, but easy to use even for english with small translation :

{{ :hardware:infrastructure:vapor1.jpg?200 |}} {{ :hardware:infrastructure:vapor2.jpg?200 |}}

===== Glycol =====

==== Ethylene glycol ====

Ethylene glycol is wildly used in industry.
<WRAP center round alert 60%>
Ethylene glycol is harmful and should be manipulated with care. Note that it’s “sugar” taste makes it attractive, and so, dangerous for children and animals.
</WRAP>

^Formulae^Melting point^Boiling point^Viscosity^Density^Flags^
|C2H6O2|−12.9°C(8.8°F; 260.2 K)|197.3°C(387.1°F; 470.4 K)|1.61 × 10−2 N*s / m2|1.1132 g/cm³|{{:datacenter:cooling:ethyglyc.png?100|}} {{:datacenter:cooling:nocif.png?80|}}|  

==== Propylene glycol ====

^Formulae^Melting point^Boiling point^Viscosity^Density^Flags^
|C3H8O2|−59°C(−74°F; 214 K)|188.2°C(370.8°F; 461.3 K)|0.042 Pa·s|1.036 g/cm³|{{:datacenter:cooling:propglyc.png?100|}}|  

===== 134a =====

{{ :hardware:infrastructure:134a.jpg?300 |}}

===== Air =====

==== Humidity/Psychrometrics ====

All informations and charts are provided here :

http://en.wikipedia.org/wiki/Psychrometrics

Detailed chart :

{{ :hardware:infrastructure:psychrometric_chart.gif?300 |}}