Reference no: EM13703881
A radiator wall measuring 2 m by 3 m (WxH) is held a temperature of 125 °C. Straight aluminium fins (k = 175 W/mK) are to be mounted on the wall. The fins are 5 cm in length and 0.8 mm thick. The system is allowed to convectively transfer heat to ambient air at 20 °C with a heat transfer coefficient of 20 W/m2K.
a. Determine the efficiency of a single fin (f).
b. Determine the heat transfer from a single fin. Fin running along the width.
c. Determine the fin effectiveness (f). Fin running along the width.
d. Determine the heat transfer if the radiator wall does not have any fins.
e. Determine the overall surface efficiency if you had 10 fins running along the length (H).
f. You are requested to design a fin system that will reject 3 times (3X) more than the bare radiator wall. Determine the number of fins needed. Run the fins along the length (H) of the wall.
i. How would the solution change if the fins were running across the width?
ii. How would the solution remain the same if the fins were running across the width?
g. If copper was used for the design in “part f” would the number of fins decrease/remain the same/increase? Explain your answer.
|
How much energy was transferred to the room
: You arrive home from a winter trip and turn on your baseboard (resistance coil) heater to warm the room. It remains on for 14 minutes, during which time it steadily consumes 3.5 kW of electricity. How much energy was transferred to the room in kJ?
|
|
Goal definition and performance indicators in soft projects
: Goal Definition and Performance Indicators in Soft Projects - Describe one specific example of good project planning in the project.
|
|
Cold cranking amperes of a conventional lead-acid
: The cold cranking amperes (CCA) of a conventional lead-acid automobile battery is the amount of current the battery can provide at 0°F for 30 seconds and maintain at least 1.2 volts per cell (or 7.2 volts for a standard 12-volt battery). If a batter..
|
|
How many households will that one installation serve
: The USEIA reported that in 2011, the average American household consumed 11,280 kWh for the year. On the outskirts of a small city, an energy company has constructed a single, large wind turbine (blade diameter 30 m). A typical average wind speed ove..
|
|
Determine the efficiency of a single fin
: A radiator wall measuring 2 m by 3 m (WxH) is held a temperature of 125 °C. Straight aluminium fins (k = 175 W/mK) are to be mounted on the wall. The fins are 5 cm in length and 0.8 mm thick. The system is allowed to convectively transfer heat to amb..
|
|
Direction of velocity and acceleration of the rocket
: A rocket is launched horizontally (x direction) at an initial velocity of 100 m/s and travels along a parabolic path given by y 2 = (100x) km. If the x component of acceleration is ax = (2t + 15) m/s2 , where t is in seconds, determine magnitude and ..
|
|
Scientists have engineered a new hydrocarbon fuel
: Scientists have engineered a new hydrocarbon fuel that generates 4100 Btu from every fluid ounce that is burned. At room temperature, this fuel has a density of 214 lbm/ft^3. What is the heating value of this fuel in kJ/kg?
|
|
Design the helical compression spring for minimum mass
: A helical compression spring made from hard drawn wire needs to be designed to fit inside a 50mm cylindrical cavity and there must be enough space inside the coils for a 20mm cylindrical guide rod.
|
|
Water temp in the inlet heavy any effect on required flow
: A water pump increases water pressure from 10 psia to 50 psi. Determine the power input required in hp to pump 1.2 ft^3/s of water. Does water temp in the inlet heavy any effect on the required flow?
|