Engineering, 13.12.2019 17:31 nyce36
Consider a thin‐walled, metallic tube of length l = 1 m and inside diameter di = 3 mm. water enters the tube at ˙ m = 0.015 kg / s m˙=0.015 kg/s and tm, i = 97°c. a. what is the outlet temperature of the water if the tube surface temperature is maintained at 27°c? ( b. if a 0.5‐mm‐thick layer of insulation of k = 0.05 w/m-k is applied to the tube and its outer surface is maintained at 27°c, what is the outlet temperature of the water? c. if the outer surface of the insulation is no longer maintained at 27°c but is allowed to exchange heat by free convection with ambient air at 27°c, what is the outlet temperature of the water? the free convection heat transfer coefficient is 5 w/m2 -k.
Answers: 2
Engineering, 04.07.2019 18:10, koolgurl2003
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.
Answers: 1
Engineering, 06.07.2019 04:30, hallynwright9722
At steady state, air enters an insulated duct of varying cross-sectional area (similar to a nozzle or diffuser) at 200 kpa, 52°c with a mass flow rate of 0.5 kg/s. at the duct exit, the pressure of the air is 100 kpa, the velocity is 255 m/s, and the cross-sectional area is 2 x 10-3 m^2. assuming an ideal gas model, determine: a)-find the specific volume of the air at the exit, in m3/kg. b)- the temperature of the air at the exit, in k. c)-the velocity of the air at the inlet, in m/s. d)-the inlet cross-sectional area, in m^2.
Answers: 1
Consider a thin‐walled, metallic tube of length l = 1 m and inside diameter di = 3 mm. water enters...
Business, 26.11.2019 02:31