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Unit 14 -Energy Loss in Homes Task 2 and 7
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Unit 14 -Energy loss in homes Task 2 and 7 apart of the assignment criteria
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Priya WillkhuCooling Curves Graph
At the beginning of graph 1 the temperature drops significantly, this is due to the cold water
bath. Graph 1 cools down quicker this is due to the cold water bath, however it reaches
23℃ at 800 seconds. It stays constant this is because it has reached equilibrium meaning
the water bath and copper calorimeter has reached the same temperature.
Graph 2 the temperature drops by 10℃ from 90℃ to 80℃ this shows that graph 2 is
cooling down slowly compared to graph 1. As the temperature decreases it does not reach
equilibrium, it is cooling down at a slower rate this is because there is no other material to
help the water cool down quicker, whereas graph 1 it cooled down much quicker because
of the cold water bath. The rate of the temperature drop in graph 1 is 0.16℃/s to 0℃/s and
in graph 2 the temperature drop is 0.05℃/s to 0.02℃/s, in graph 1 the temperature drop is
much quicker compared to graph 2 however in graph 2 the cooling curve is still trying to
reach equilibrium but in graph 1 the cooling curve has reached equilibrium.
Task 2
Heat flows from the warmer to the cooler object until they are both at the same temperature
this is conduction in the experiment this occurs in graph 1 the temperature becomes the
same and reaches equilibrium. Metals are good conductors of heat so therefore the copper
calorimeter cooled down slowly without the water bath but however with the water bath the
water cooled down at a much quicker rate but reaches equilibrium. Convection occurs
when warmer areas of a liquid or gas rise to cooler areas in the liquid or gas. This occurs
when the surface of the water rises into the atmosphere this creates convection currents.
With conduction and convection they both need matter to transfer heat, however radiation it
does not rely on any contact with heat source or heated object. Radiation can be felt but
not touched such as thermal radiation also known as infrared radiation which consists of
electromagnetic radiation. So therefore in the experiment the objects absorb and emit
radiation. The hotter the object more heat is lost, this is a form of radiation.
In the industrial processes, water cooling is made to work faster.
What could be done to the water to increase the rate of cooling and explain why this works?
With the process of water cooling the heat removed from one medium is transferred to
another medium, or process fluid. Most often, the cooling medium is water, efficient
removal of heat is an economic requirement for the cooling system. With renewal of water
this will help increase the water cooling as you are maximise the temperature difference.
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