- #1
NW8800
- 16
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Hey I have 2 questions (q2 follows on from q1), both on average heat power:
1) In an experiment to determine the rate at which heat is extracted from a hot material, 302 g of the material at 90 °C is put into a 50 mm diameter copper vessel to a depth of 90 mm as shown below. The hot material and calorimeter are placed in a container holding 196 g of cold water at 22.7 °C. The temperature of the water is then measured every 30 seconds for 3minutes. The results are plotted as in the previous question and the average temperature rise per second is calculated as 0.0065 ± 0.0005 °C/sec.
From the data provided and the graph below, determine the average heat power ( in kW ) transferred to the water
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2) When tested with hot material packed to a depth of 91 mm from the 50 mm diameter copper pipe used in the previous experiment the average heat power transferred to the water was found to be 5.9kW. What is the average heat power (in kW) transferred into the water PER METRE of copper container when packed with the same hot material and placed in a water cooled situation as shown.
Not to sure
I tried to use the P cond = kA (T h - T c)/L, but I am not sure what k would be...
Any one got an answer/idea?
Cheers,
NW
Homework Statement
1) In an experiment to determine the rate at which heat is extracted from a hot material, 302 g of the material at 90 °C is put into a 50 mm diameter copper vessel to a depth of 90 mm as shown below. The hot material and calorimeter are placed in a container holding 196 g of cold water at 22.7 °C. The temperature of the water is then measured every 30 seconds for 3minutes. The results are plotted as in the previous question and the average temperature rise per second is calculated as 0.0065 ± 0.0005 °C/sec.
From the data provided and the graph below, determine the average heat power ( in kW ) transferred to the water
----
2) When tested with hot material packed to a depth of 91 mm from the 50 mm diameter copper pipe used in the previous experiment the average heat power transferred to the water was found to be 5.9kW. What is the average heat power (in kW) transferred into the water PER METRE of copper container when packed with the same hot material and placed in a water cooled situation as shown.
Homework Equations
Not to sure
The Attempt at a Solution
I tried to use the P cond = kA (T h - T c)/L, but I am not sure what k would be...
Any one got an answer/idea?
Cheers,
NW