Steam at 320 c flows in a cast iron pipe (k = 80 w/mk) whose inner and outer diameters are 5 cm and 5.5 cm respectively. the pipe is covered with 3 cm thick glass wool insulation with k = .05 w/m-k. heat is lost to the surrounding at 5 c by natural convection with heat transfer coefficient of 60 w/m^2-k. taking the heat transfer coefficient inside the pipe to be 18 w/m^2k, determine the rate of heat loss from the steam per unit length of the pipe. also determine the temperature drop across the pipe shell and the insulation.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false

Ajournal bearing has a journal diameter of 3.250 in with a unilateral tolerance of 20.003 in. the bushing bore has a diameter of 3.256 in and a unilateral tolerance of 0.004 in. the bushing is 2.8 in long and supports a 700-lbf load. the journal speed is 900 rev/min. find the minimum oil film thickness and the maximum film pressure for both sae 20 and sae 20w-30 lubricants, for the tightest assembly if the operating film temperature is 160°f. a computer code is appropriate for solving this problem.