an open container with 10L of water at 1 bar and 20 C is used for cooling electronic parts.Each electronic part has a mass of 01.kg and an average specific heat of 0.14 kJ/kg-K. The electronic parts are initially at 300 degrees Celcius and are required to be cooled to 80 degrees celcius without causing the temperature of water to exceed 60 degrees.
how do I go about this problem?
What is the question? Flow rate?
To solve this problem, you'll need to consider the amount of heat transferred between the electronic parts and the water, as well as the temperature changes involved.
First, let's calculate the amount of heat required to cool each electronic part from 300°C to 80°C. We can use the specific heat formula:
Q = m * c * ΔT
where Q is the heat transfer, m is the mass, c is the specific heat, and ΔT is the change in temperature.
For each electronic part:
m = 0.1 kg (given)
c = 0.14 kJ/kg-K (given)
ΔT = (80°C - 300°C) = -220°C
Now, plug in the values to calculate Q:
Q = 0.1 kg * 0.14 kJ/kg-K * (-220°C)
Next, find the total amount of heat required to cool all the electronic parts. Since there are no specific values given for the number of electronic parts, let's assume there are N parts in total:
Total Q = N * Q
Let's assume the temperature of the water rises from 20°C to a final temperature of T°C after absorbing the heat from the electronic parts. We can calculate the heat transfer from the water to find T.
The heat lost by the electronic parts is equal to the heat gained by the water:
Total Q = m_water * c_water * ΔT_water
where m_water is the mass of the water, c_water is its specific heat, and ΔT_water is the change in temperature.
Let's assume the mass of the water is M kg:
Total Q = M * c_water * (T - 20°C)
Since the total heat transferred from the electronic parts is equal to the total heat absorbed by the water, we can equate the two equations:
N * Q = M * c_water * (T - 20°C)
Solve this equation to find the value of N and T.
Finally, we need to ensure that the temperature of the water does not exceed 60°C. If, after calculating T, you find that it's greater than 60°C, you may need to adjust the number of electronic parts or consider additional cooling methods to prevent the water from reaching the maximum temperature.