Question

A 25 mm diameter egg roll (k = 1 W/m degree Celsius) is roasted with the...

A 25 mm diameter egg roll (k = 1 W/m degree Celsius) is roasted with the help of microwave heating. For good quality roasting, it is desired that temperature at the center of roll is maintained at 100 degree Celsius when the surrounding temperature is 25 degree Celsius. What should be the heating capacity in K W/m of the microwave if the heat transfer coefficient on the surface of egg roll is 20 W/m? degree Celsius? a) 113.31 k W/m b) 213.31 k W/m c) 313.31 k W/m d) 413.31 k W/m

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
71 mm thick horizontal plate made of an opaque material of thermal conductivity k= 25 W/m-K....
71 mm thick horizontal plate made of an opaque material of thermal conductivity k= 25 W/m-K. At the bottom, water flows at a temperature of T∞,w = 25C, whereas air flows at the top of the plate at T∞,a = 710 C having convection coefficient of ha= 71 W/m2-K. Assuming a diffused top of the plate that receives an irradiated flux of 7100W/m2, of which 30% is reflected back. The top and bottom surface temperatures are maintained at 43 C...
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.
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 house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1...
A house has a composite wall of wood (exterior) (k = 0.12 W m-1 K -1 , 20 mm thick), fibreglass insulation (k = 0.045 W m-1 K -1 , 70 mm thick) and plasterboard (interior) (k = 0.25 W m-1 K -1 , 10 mm thick). Determine the total heat loss through the wall when the inside temperature is 20 °C, the outside temperature is -10 °C, the inside heat transfer coefficient is 15 W m-2 K -1 ,...
A stainless-steel fin (k = 16 W/m. °C) has a length of 15 cm and a...
A stainless-steel fin (k = 16 W/m. °C) has a length of 15 cm and a square cross section 12.5 by 12.5 mm attached to a wall maintained at 250 °C. The heat-transfer coefficient is 40 W/m. °C, and the environment temperature is 90 °C. Calculate the percentage increase in heat transfer after attaching the fin.
A condenser is made up of a horizontal tube bank (0.75 m long, 200 mm diameter)....
A condenser is made up of a horizontal tube bank (0.75 m long, 200 mm diameter). Saturated steam at 143.3 kPa condenses on the outside surface of the tubes. The surface temperature is maintained at 90°C. Evaluate the condensation rate and heat transfer coefficient if the bank consists of 15 tubes.
A 4-mm thick, 20cm diameter cast iron frying pan (K = 55 W/mK) is heated on...
A 4-mm thick, 20cm diameter cast iron frying pan (K = 55 W/mK) is heated on a traditional stovetop range. Under certain stovetop settings, the temperature on the bottom surface of the pan (in contact with the heating element) is measured to be 160°C and that on the inside of the pan (cooking surface) is 150°C. Using the heat diffusion equation, find an expression (specific solution) for the temperature distribution across the thickness of the pan.
A 40-mm-thick plain wall of thermal conductivity 0.04 W/m-K and of temperature 304 K is exposed...
A 40-mm-thick plain wall of thermal conductivity 0.04 W/m-K and of temperature 304 K is exposed to both cold fluid and surroundings both at 298 K. The cold fluid and wall provide that the heat transfer coefficient is 10.5 W/m2-K and the emissivity of the wall is 0.83. Given that the area of the wall is 1.5m2 If the total heat transferred is 140.6987W, find the temperature of the other side of the plain wall
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...
An aluminum fin 1.6 mm thick surrounds a tube 2.5 cm in diameter. The length of...
An aluminum fin 1.6 mm thick surrounds a tube 2.5 cm in diameter. The length of the fin is 12.5 mm. The tube-wall temperature is 200◦C, and the environment temperature is 20◦C. The heat-transfer coefficient is 60 W/m2 · ◦C. Consider the heat dissipated in a pipe 1.20 m long if the fins are 4.2 mm apart from center to center Explain your procedure with formulas