Question

A spherical tank, 1.5 m in diameter, is maintained at a temperature of 120 ◦C and...

A spherical tank, 1.5 m in diameter, is maintained at a temperature of 120 ◦C and exposed to a convection environment with heat transfer coefficient, h=15 W/m2 ◦C and T =20 ◦C. For the same surface temperature of the tank, it is desired to insulate the tank in order to decrease the heat loss by 45 percent, determine the thickness of insulation layer (k=0.2 W/m ◦C ) and the outer surface temperature.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A flat wall is exposed to an environmental temperature of 38 degrees C. The wall is...
A flat wall is exposed to an environmental temperature of 38 degrees C. The wall is covered with a layer of insulation 2.5 cm thick whose thermal conductivity is 1.8 W/(m.K), and the temperature of the wall on the inside of the insulation is 320 degrees C. The wall loses heat to the environment by convection. Compute the value of the convection heat transfer coefficient that must be maintained on the outer surface of the insulation to ensure that the...
2.1Consider a solid cylindrical rod of length 0.15 m and diameter 0.05 m. The top and...
2.1Consider a solid cylindrical rod of length 0.15 m and diameter 0.05 m. The top and bottom surfaces of the rod are maintained at constant temperatures of 20oC and 95oC, respectively, while the side surface is perfectly insulated. 2.1.1 Draw a diagram to represent the situation described above. (3) 2.1.2 Determine the rate of heat transfer through the rod if it is made of copper, k = 380 W/m? oC. (4) 2.1.3 Determine the rate of heat transfer through the...
In a steel spherical reactor with a heat transmission coefficient (10 + X) W / mK,...
In a steel spherical reactor with a heat transmission coefficient (10 + X) W / mK, water is boiled at 350 oC. The inner diameter of the tank is 80 cm and the wall thickness is (5+ (X / 2)) cm. This tank is insulated with (X) cm thick concrete (k = 2.5 W / mK). Outdoor heat transfer coefficient (10+ (X)) W / m2K, indoor heat transfer coefficient is 500 W / m2K. Calculate both surface temperatures of the...
A 1 m outer diameter spherical tank made of AISI 304 steel with 10 cm wall...
A 1 m outer diameter spherical tank made of AISI 304 steel with 10 cm wall thickness contains solid iced water at 0°C. Air at 25°C flows outside the tank with a velocity of 1 m/s. Determine the rate of heat transfer to the tank and the mass rate ( m_dot) at which ice melts. Ignore convection effects of the melting ice. The latent heat of fusion of water at 0°C is 333.7 kJ/kg. Thanks!
Steam at an average temperature of ?∞= 400°C flows through a steel pipe. The inner and...
Steam at an average temperature of ?∞= 400°C flows through a steel pipe. The inner and outer radii of the pipe are r1 = 4 cm and r2 = 4.5 cm, respectively, and the outer surface of the pipe is insulated with a layer of 50 mm thick-calcium silicate of thermal conductivity of k = 0.5 W/m.K, and is maintained at 350 °C. If the convection heat transfer coefficient on the inner surface of the pipe is h = 65...
A spherical object (50 cm diameter, c=0.46 kJ/kg*C, k = 42 W/m*C, density = 7800 kg/m3...
A spherical object (50 cm diameter, c=0.46 kJ/kg*C, k = 42 W/m*C, density = 7800 kg/m3 ) is initially at a uniform temperature of 450 C. It is suddenly placed in a constant temperature environment of 100 C. The convection transfer coefficient is 500 W/m2*C. How long would it take for temperature in the center of the sphere to cool down to 150 C? Note: Bi for a sphere is (hD)/(6k).Suggestion: First calculate Biot number, then determine if T is...
Water flows through a pipe at an average temperature of T =50°C. The inner and outer...
Water flows through a pipe at an average temperature of T =50°C. The inner and outer radii of the pipe are r1 = 6 cm and r2 = 6.5 cm, respectively. The outer surface of the pipe is wrapped with a thin electric heater that consumes 300 W per m length of the pipe. The exposed surface of the heater is heavily insulated so that the entire heat generated in the heater is transferred to the pipe. Heat is transferred...
A fin of rectangular profile has a thermal conductivity of 14 W/m C, thickness of 2.0...
A fin of rectangular profile has a thermal conductivity of 14 W/m C, thickness of 2.0 mm, and length of 23 mm. The base of the fin is maintained at a temperature of 220 o C while the fin is exposed to a convection environment at 23 o C with h=25 W/m2 o C. Calculate heat lost per meter of fin depth for the three tip conditions. (a) Convection, (b) Adiabatic, and (c) T (x=L) = 23 o C.
a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to...
a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 0C resulting in the convective coefficient, h = 114 W/ m2 K. The relevant properties of mild steel are given as follows: Density , /7850 2 mkg  Specific heat K kgJc p / 475 and thermal diffusivity hr m /043.0 2  Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 0C to 950C. [7...
a. Discuss why car inside temperature is high when you park the car outside in a...
a. Discuss why car inside temperature is high when you park the car outside in a sunny day even under the shade and the relation with glass transmissivity (Greenhouse effect). [5 marks] b. A double walled spherical tank is used to store iced water at O'C. The tank internal diameter is 2 m and wall thickness is 0.5 cm. The inner and outer walls are separated with the 2 cm thick space. The air between the two walls of the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT