A hot water tank contains water at a bulk temperature of 60°C. It is of 1...
A hot water tank contains water at a bulk temperature of 60°C. It is of 1 m × 1 m section and 2 m high. The sides are exposed to air at 20°C. Determine the values of convection coefficients on the air side and also the wall temperature.
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A hot water tank contains water at a bulk temperature of 60°C.
It is of 1...
3. Hot water at an average temperature of 60°C and an average velocity of 0.6 m/s...
3. Hot water at an average temperature of 60°C and an average velocity of 0.6 m/s is flowing through a 5- m section of a thin-walled hot water pipe that has arn outer diameter of 2.5 cm. The pipe passes through the centre of a 14 cm-thick wall filled with fiberglass insulation (k-0.035 W/rm C), If the surfaces of the wall are at 18 C, determine (a) the rate of heat transfer from the pipe to the air in the...
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water a...
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water at Tout 10 C with h,ut 60 W/m2.K. The thermal conductivity of the heat exchanger is 180 W/m.K To extend the heat transfer area, two-dimensional ridges are machined on the cold side of the wall. This geometry causes non-uniform thermal stresses, which may become critical for crack initiation along the lines between two ridges. To predict thermal stresses, the temperature...
“A pipe is carrying hot water through a cold storage facility. The ambient air in the...
“A pipe is carrying hot water through a cold storage facility. The ambient air in the cold storage has temperature of ?5?C. To maintain uniform temperature in the cold storage, blowers installed in the facility induce a 3 m/s velocity to the cold air (which can be assumed to be flowing across the water pipe). Hot water inside the pipe has a mean velocity of 0.5 m/s. The internal and exter- nal diameter of the pipe are 8.4 cm and...
Problem 4: Consider the heat exchanger design illustrated. Hot air flows at speed of r0.6 m/s thr...
Problem 4: Consider the heat exchanger design illustrated. Hot air flows at speed of r0.6 m/s through the center pipe. The center pipe has an outer diameter of D=7 cm and length 4-2 m Cold water flows at 20-25 cm3/s through a smaller helical pipe having an outer diameter d = 1 cm and wall thickness of mm. The helical pipe is wrapped around the center pipe to form a heat exchanger. The center pipe has a thermal conductivity of...
Help mee!! Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe...
Help mee!!
Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of a cast In a heating iron pipe (k 50 W/m K) whose inner and outer diameters are 4 cm and 5 cm, respectively. The outer surface of the pipe, whose emissivity is 0.75, is exposed to the cold air at 10°C in the basement. with a heat transfer coefficient of 15 W/m2.K. The heat transfer coefficient at the inner surface of the pipe is...
Hot water with the mass flow rate of 3 kg/s and temperature of 90 C enters...
Hot water with the mass flow rate of 3 kg/s and temperature of 90 C enters a 2 inch copper pipe with the length of 3 m. The pipe is exposed to cold air at the constant temperature of 1C and wind velocity is 5 m/s. Find the outlet temperature of water and the rate of heat loss from the pipe. P2: 20%
4. A hot plate of 15cm2 area maintained at temperature of 200C is exposed to still...
4. A hot plate of 15cm2 area maintained at temperature of 200C is exposed to still air at 30°C. When smaller side of the plate is held vertical, the convection heat transfer rate is 14% higher than that when bigger side of the plate, held vertical. Determine the dimensions of the plate. Neglecting the internal temperature gradients of the plate. Also calculate the heat transfer rate in both cases. Use relation Nul-0.59(Gr P)4 ULO 3-I)
Heat is uniformly generated at the rate of 2x 10W/m* in a wall of thermal conductivity...
Heat is uniformly generated at the rate of 2x 10W/m* in a wall of thermal conductivity 25 W/m-K and thickness 60 mm. The wall is exposed to convection on both sides, with different heat transfer coefficients and temperatures as shown. There are straight rectangular fins on the right-hand side of the wall, with dimensions as shown (L =20 mm) and thermal conductivity of 250 W/m-K. What is the maximum temperature that will occur in the wall? L tt-2 mm k=25...
A perfectly insulated cubical tank 0.8 m on each side contains liquid water at 18 C....
A perfectly insulated cubical tank 0.8 m on each side contains liquid water at 18 C. A cube of copper 0.2 m on each side with a temperature of 90 C is quickly plunged into the water displacing an amount of water equal to the volume of the copper block. A perfectly insulated lid is quickly placed on the top of the tank. Determine the final temperature of the block and the water after a long period of time.
3. Hot water at an average temperature of 60°C and an average velocity of 0.6 m/s is flowing through a 5- m section of a thin-walled hot water pipe that has arn outer diameter of 2.5 cm. The pipe passes through the centre of a 14 cm-thick wall filled with fiberglass insulation (k-0.035 W/rm C), If the surfaces of the wall are at 18 C, determine (a) the rate of heat transfer from the pipe to the air in the...
The wall of a heat exchanger separates hot water at Tin 90 C with h." 80 w/m2.K from cold water at Tout 10 C with h,ut 60 W/m2.K. The thermal conductivity of the heat exchanger is 180 W/m.K To extend the heat transfer area, two-dimensional ridges are machined on the cold side of the wall. This geometry causes non-uniform thermal stresses, which may become critical for crack initiation along the lines between two ridges. To predict thermal stresses, the temperature...
Problem 4: Consider the heat exchanger design illustrated. Hot air flows at speed of r0.6 m/s through the center pipe. The center pipe has an outer diameter of D=7 cm and length 4-2 m Cold water flows at 20-25 cm3/s through a smaller helical pipe having an outer diameter d = 1 cm and wall thickness of mm. The helical pipe is wrapped around the center pipe to form a heat exchanger. The center pipe has a thermal conductivity of...
Help mee!!
Q1. Heat conduction & convection (38 pt). Hot water flows in a steel pipe of 0.1 m inside diameter at a flow rate of 0.2 m/h and at an average temperature of 70 °C. The pipe length is 2.5 m and the inside pipe wall temperature is 60 °C Assume that the pipe thickness is small and the steel heat conductivity is high enough so that the thermal resistance of the pipe wall is negligible. Calculate: (a) The...
system, hot water at an average temperature of 80°C is flowing through a 15-m section of a cast In a heating iron pipe (k 50 W/m K) whose inner and outer diameters are 4 cm and 5 cm, respectively. The outer surface of the pipe, whose emissivity is 0.75, is exposed to the cold air at 10°C in the basement. with a heat transfer coefficient of 15 W/m2.K. The heat transfer coefficient at the inner surface of the pipe is...
Hot water with the mass flow rate of 3 kg/s and temperature of 90 C enters a 2 inch copper pipe with the length of 3 m. The pipe is exposed to cold air at the constant temperature of 1C and wind velocity is 5 m/s. Find the outlet temperature of water and the rate of heat loss from the pipe. P2: 20%
4. A hot plate of 15cm2 area maintained at temperature of 200C is exposed to still air at 30°C. When smaller side of the plate is held vertical, the convection heat transfer rate is 14% higher than that when bigger side of the plate, held vertical. Determine the dimensions of the plate. Neglecting the internal temperature gradients of the plate. Also calculate the heat transfer rate in both cases. Use relation Nul-0.59(Gr P)4 ULO 3-I)
Heat is uniformly generated at the rate of 2x 10W/m* in a wall of thermal conductivity 25 W/m-K and thickness 60 mm. The wall is exposed to convection on both sides, with different heat transfer coefficients and temperatures as shown. There are straight rectangular fins on the right-hand side of the wall, with dimensions as shown (L =20 mm) and thermal conductivity of 250 W/m-K. What is the maximum temperature that will occur in the wall? L tt-2 mm k=25...
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