Question

QUESTION 1 (10 marks) a) Write the Newton's law of heat convection in fluid using convection heat transfer coefficient, h (Wm2.K). Please explain the equation in terms of its driving force and resistancC (2 marks) (POUCOI/C2) b) Define the heat transfer rate, q,by inside and outside convection and wall conduction considering a stainless steel cylindrical pipe (inside radius, ri and outer radius, ) with fiberglass insulator (radius, s) in ą steady state condition as shown in Figure Q11 Steam with temperature of Ti lowing inside the pipe, and the wall temperature of dhe and the outer layer of insulator is given as T. T, and T, respectively. The pipe is exposed to the air at temperature given as Ts The convection coefficient of the steam and the air is given as hy and bz(W/m2 K), and the thermal conductivity for stainless steel and fiberlass insulator is ki Wm.K) and I(W/m.K), respectively. The lenath of the pipe is given 4 diff (8 marks) (POL/COL/C2) Ti Figure 01.1 Heat flow of stainless steel cylindrical pipe with fibreglass insulation

Answer 1

Ceb deke tance conston. ick as th msen. the ne ynatry, the natre.

2 TA V-1

ToA 仁。 5.2 RA (#att) br )(2TYL 1 1