- 2. Determine the heat transfer coefficient and the linear heat flux in the transverse air flow for a pipe with a diameter of A=30 mm, if its surface temperature is t_(s)= 90^circ C the air temperature is t_(a)=-10^circ C and the wind speed is w=4m/s
- 1. The wall of the unshielded combustion chamber of the steam boiler is made of foam-fireclay (rho =950kg/m^3) with a thickness of delta _(1)=300 mm and a layer of tripoli brick with a thickness of delta _(2)=150mm The layers are tightly adjacent to each other. The temperature on the inner surface of the combustion chamber is t_(s1)=600^circ C and on the outer surface is t_(s3)=10^circ C Calculate the heat flux and temperature in the place of contact between the layers.
- 2. The pipe with an outer diameter of d=35mm is cooled in an oil cross flow (oil is trans.oil). The oil flow velocity and the average oil temperature are respectively: w =0.5m/s and t_(1)=25^circ C Determine what temperature of the pips surface must be maintained so that the heat flux will be equal to q=30W/m^2 and what will be the value of the heat transfer coefficient?
- 2. Determine the heat transfer coefficient and the linear heat flux in the transverse air flow for a pipe with a diameter of d=25 mm, if its surface temperature is t_(s)= 80^circ C the air temperature is t_(a)=-15^circ C and the wind speed is w=9m/s
- Variant 23 1. The wall of the unshielded combustion chamber of the steam boiler is made of foam-fireclay (rho =950kg/m^3) with a thickness of delta _(1)=100 mm and a layer of red brick with a thickness of delta _(2)=450 mm. The layers are tightly adjacent to each other. The temperature on the inner surface of the combustion chamber is t_(s1)=900^circ C and on the outer surface is t_(s3)=25^circ C Calculate the heat flux and temperature in the place of contact between the lavers
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