THREE QUESTIONS TEST
- What is the merit of cooling a place using AIR, a good insulating medium, with low thermal capacity?
- If you want to empty a tank, do you pump it out or would you rather drain it?
- Which heat transfer process would you choose: A or B?
- linearly proportional to temperature difference (i.e. doubling ∆ T = 2 x heat transfer rate)
- proportional to 4th power of temperature difference (i.e. doubling ∆ T = 16 x heat transfer rate)
LETS EXPLORE WHY
|Thermal Conductivity||Specific Heat Capacity||Density|
Water presents a significantly higher heat transfer capacity:
- The multiplier of specific heat capacity and density for water vs. air is ~ 3400 (heat absorption per unit volume)
- The thermal conductivity multiplier for water vs. air is ~ 20 (heat transfer per unit area per unit thickness)
|Medium||Cooling Capacity||Flowrate Required||Power Required|
|Air||100 TR||~ 40,000 cfm||22 kW|
|Water||100 TR||~32 cfm||3.7 kW|