Engineering, 09.10.2019 01:10 klk597703
The hot water pipe leaving a residential water heater is not insulated. the water flowing inside is maintained at 49 °c and has a convection coefficient of 234 w/m2 *k. the inside diameter of the copper (400 w/m*k) pipe is 0.745 inches; the wall thickness is 0.065 inches. the temperature and the convection coefficient of the air surrounding the pipe are 15 °c and 16 w/m2 *k respectively. determine the heat loss per unit length of uninsulated pipe, and the temperature of the outer surface. determine the heat loss and the outermost surface temperature for the same conditions with the pipe insulated using 3/8"-thick insulation whose thermal conductivity is 0.034 w/m*k. do the surface temperatures of the copper pipe change with the addition of insulation?
Answers: 1
Another question on Engineering
Engineering, 04.07.2019 18:10
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, 04.07.2019 18:10
The higher the astm grain-size number, the coarser the grain is. a)-true b)-false
Answers: 3
Engineering, 04.07.2019 18:10
Ahot wire operates at a temperature of 200°c while the air temperature is 20°c. the hot wire element is a tungsten wire of 5 um diameter and 2 mm in length. plot using excel current, heat transfer and heat generated by the wire for air velocity varying from 1-10 m/s in steps of lm/s? matlab the sensor voltage output, resistance, or assume nu 0.989 re033pr13 take air properties at tr (200°c20°c)/2 = 110°c properties of tungsten: c 0.13 kj/kg.k 3 p 19250 kg/m k (thermal conductivity) = 174 w/m.k
Answers: 2
Engineering, 04.07.2019 18:20
Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.
Answers: 1
You know the right answer?
The hot water pipe leaving a residential water heater is not insulated. the water flowing inside is...
Questions
Mathematics, 07.03.2020 04:21
