Evaporative Cooling
Evaporative Cooling - Related Videos
06:43
Rotary Evaporation to Remove Solvent
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2023
Source: Dr. Melanie Pribisko Yen and Grace Tang — California Institute of Technology Rotary evaporation is a technique most commonly used in organic chemistry to remove a solvent from a higher-boiling point compound of interest. The rotary evaporator, or "rotovap", was invented in 1950 by the chemist Lyman C. Craig. The primary use of a rotovap is to dry and purify samples for downstream applications. Its speed and ability to handle large volumes of solvent make rotary evaporation a preferred...
02:44
Heating and Cooling Curves
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2020
When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves. For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...
06:39
A High Performance Impedance-based Platform for Evaporation Rate Detection
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Cited by 1 •
2016
This paper presents an impedance-based apparatus for evaporation rate detection of solutions. It offers clear advantages over a conventional weight loss approach: a fast response, high-sensitivity detection, a small sample requirement, multiple sample measurements, and easy disassembly for cleaning and reuse purposes.
11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Cited by 1 •
2017
We present a parametric driving method to cool an ultracold Fermi gas in a crossed-beam optical dipole trap. This method selectively removes high-energy atoms from the trap by periodically modulating the trap depth with frequencies that are resonant with the anharmonic components of the trapping potential.
08:58
Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation
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Cited by 1 •
2015
A protocol for seedless and high yield growth of bismuth nanowire arrays through vacuum thermal evaporation technique is presented.
FAQs
The wet-bulb temperature sets a practical lower limit for evaporative cooling under given atmospheric conditions. As water evaporates, the air gains water vapor and approaches this limit rather than continuing to cool indefinitely. Engineers therefore assess the gap between incoming air conditions and the wet-bulb value when estimating achievable cooling and selecting a system.
Humidity directly influences performance because air with more existing water vapor has less capacity to accept additional vapor. Airflow also matters because it controls how effectively warm air contacts the wetted medium or spray and how much cooled air moves through the system. These variables must be balanced to support consistent heat transfer.
Evaporative cooling can reduce electricity use relative to compressor-based refrigeration because it relies on evaporation rather than the same refrigeration approach. However, its advantage is conditional: performance declines as humidity rises. This makes the method attractive where atmospheric conditions permit effective evaporation, while hybrid designs can help maintain thermal management when conditions vary.
A basic engineering workflow begins by bringing warm air into contact with water distributed across a wetted medium or introduced as a spray. The resulting air stream leaves with lower temperature and added water vapor. Designers then manage airflow and water-air contact conditions to approach the desired cooling performance while recognizing the wet-bulb limit.
These systems are useful for cooling towers, evaporative air conditioners, and industrial process cooling. In each case, the engineering objective is to remove heat without relying solely on compressor-based refrigeration. The approach can lower electricity demand, but engineers must account for local humidity and airflow when judging suitability and expected performance.
Airflow control and hybrid designs are important when evaporative performance varies with atmospheric conditions. Because humidity can reduce effectiveness, engineers use these approaches to support more reliable thermal management. This strategy is relevant to systems that must continue managing heat even when the surrounding air provides less favorable conditions for evaporation.