Chemical Engineering - Heat Transfer - Discussion
Discussion Forum : Heat Transfer - Section 1 (Q.No. 15)
15.
In Joule's experiment, an insulated container contains 20 kg of water initially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglecting the heat capacity of agitator, the temperature of water (in °C) is
Discussion:
22 comments Page 1 of 3.
Samuel A said:
1 year ago
Thank you for giving an explanation.
Harika said:
3 years ago
Thankyou @Muhammed Ishaq.
(2)
Muhammed Ishak T N said:
3 years ago
@All.
Guys please try to solve this. The correct value for cp is 4180
By 1st law of thermodynamics;
Energy neither be created nor destroyed, it can be transformed from one form to another form.
So,
For 500 turns.
mgh = mcp( T2 - T1),
500*40*9.8*4 = 20*4180( T2-25),
By solving these we get;
784000 = 83600(T2-25),
T2-25 = 9.379,
So, T2 = 34.4,
Guys please try to solve this. The correct value for cp is 4180
By 1st law of thermodynamics;
Energy neither be created nor destroyed, it can be transformed from one form to another form.
So,
For 500 turns.
mgh = mcp( T2 - T1),
500*40*9.8*4 = 20*4180( T2-25),
By solving these we get;
784000 = 83600(T2-25),
T2-25 = 9.379,
So, T2 = 34.4,
(43)
Mohd Kasid said:
3 years ago
Thank you everyone for explaining the answer.
(2)
N.B. Parmar1753 said:
3 years ago
Thanks @Manu.
Ashish Yadav said:
4 years ago
Thanks everyone for explaining it.
Hadi muhammed said:
4 years ago
Thank you.
Jaykishor kumar yadav said:
6 years ago
Temperatures of heat exchangers depond upon the the flow of steam and pressure.
Melese said:
6 years ago
nmgh = mcpdt.
dT = T2-T1.
dT = T2-T1.
(1)
Selamu Abule said:
6 years ago
@Emeka.
Thanks for explaining.
Thanks for explaining.
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