Cooling jug physics

We discuss the physics of the pot-in-pot cooler. By balancing temperature decrease due to evaporation and temperature increase due to heat exchange, we find the equilibrium temperature of the pot. In this simplified model, the cooling jug acts as a psychrometer, and the theoretical prediction of our...

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Published in:Emergent scientist 2017, Vol.1, p.5
Main Authors: Luniachek, Oleh, Timchenko, Ruslan, Golubov, Oleksiy
Format: Article
Language:English
Subjects:
Approximation
Cooling
Equilibrium
Evaporation
Food
Geometry
Heat conductivity
Heat exchange
Humidity
phase transitions
physical kinetics
Physics
Temperature
Water vapor
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description We discuss the physics of the pot-in-pot cooler. By balancing temperature decrease due to evaporation and temperature increase due to heat exchange, we find the equilibrium temperature of the pot. In this simplified model, the cooling jug acts as a psychrometer, and the theoretical prediction of our model is in a good agreement with psychrometric tables. Next, we study dynamics of the jug cooling. The cooling rate is limited by water vapour diffusion through air, heat conduction through air, and heat conduction through the body of the jug. The derived rate of temperature decrease is in general agreement with the result of our experiment. In the end, we discuss some additional factors, such as capillary effects in the raw clay, water viscosity in the capillaries, and impact of complex shape of the jug.
doi_str_mv 10.1051/emsci/2017005
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subjects Approximation
Cooling
Equilibrium
Evaporation
Food
Geometry
Heat conductivity
Heat exchange
Humidity
phase transitions
physical kinetics
Physics
Temperature
Water vapor
title Cooling jug physics
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