Question

Consider the same piping system. this time, the same pipe is buried underground. assuming that there is a constant heat flux of 100w/m^2 from the outer surfance of the pipe to the soil determine the exit temperature of the water.

a. 129.1
b. 111.1
c. 82.1
d. 68.1

Answer 1

Complete Question

Complete Question is attached below

Answer:

Option A

Step-by-step explanation:

From the question we are told that:

inner Diameter of pipe
`d_i=100^c`

Thickness
`t=50mm`

Outer diameter of pipe
`d_o=1.1m`

Length
`l=5m`

Temperature
`T_i=130^oC`

Generally the equation for Heat Balance is mathematically given by

`q*\pi d_oL=mC_p(T_i-T_o)`

Therefore

`T_o=T_i+(q*\pi d_oL)/(mC_p)`

`T_o=130+(100*3.142 *1.1*5)/(0.5*4000)`

`T_o=129.136^oC`

Therefore the exit temperature of the water.is
`T_o=129.136^oC`

Option A