Engineering, 02.04.2020 01:19 WinterStrikesBack

An air duct heater consists of an aligned array of electrical heating elements in which the longitudinal and transverse pitches are SL = ST = 24 mm. There are 3 rows of elements in the flow direction (NL = 3) and 4 elements per row (NT = 4). Atmospheric air with an upstream velocity of 12 m/s and a temperature of 25°C moves in cross-flow over the elements, which have a diameter of 12 mm, a length of 250 mm, and are maintained at a surface temperature of 350°C.

(A) Determine the total heat transfer to the air and the temperature of the air leaving the duct heater.

(B) Determine the pressure drop across the element bank and the fan power requirement.

(C) Compare the average convection coefficient obtained in your analysis with the value for an isolated (single) element. Explain the difference between the results.

Answers: 3

Show answers

Another question on Engineering

Engineering, 04.07.2019 18:10

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.

Answers: 2

Answer

Engineering, 04.07.2019 18:10

Calculate the bore of a cylinder that has a stroke of 18 inches and an extension time of 6 seconds at a flow rate of 4 gal/min.

Answers: 3

Answer

Engineering, 04.07.2019 18:10

Which from the following instrument is commonly used to detect the high pitch butzing sound in bearings? [clo4] a)-digital ultrasonic meter b)-infrared camera c)-spectroscopic d)-vibrometer

Answers: 2

Answer

Engineering, 04.07.2019 18:10

An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0

Answers: 3

Answer

You know the right answer?

An air duct heater consists of an aligned array of electrical heating elements in which the longitud...

Questions