# Question: a pipe carrying brine at 8c passes through a...

###### Question details

A pipe carrying brine at – 8°C passes through a room at 30°C.
The outside diameter of the pipe

is 15 cm and the convection coefficient has a value of 18 W/m2K.
Determine the heat gain for

10 m length. In order to reduce the heat gain moulded insulations
of 2.5 cm, 4 cm, 6 cm and 8 cm

thicknesses are available with conductivities of 0.06 W/mK.
Determine the percentage reduction

due to each of these. If the cost of heat is Rs. 3/1000 kJ
determine in each case the break even

cost per m3 of insulation material if the investment is to be
realized in one year of operation. The

unit is in operation for 7000 hr/year.