Keeping the pets happy
The optimum tank
temperature is 25oC.
The external
temperature is 20oC.
You may ignore heat losses into the air above the water but
not through the tank top, and the energy needed to heat the turtles. Assume
negligible heat losses through the base.
What should the power
rating of the heater be to maintain the temperature inside the water ?
If the heater breaks,
how long before the water inside the tank cools to the same temperature as the
air outside ?
Data:
density of water
1000kgm-3
specific heat
capacity of water 4200Jkg-1oC-1
U-value of glass
5.0Wm-2oC-1
U-value of top of
tank 3.0Wm-2oC-1