Q: A vertical, rectangular water duct 1 m high and 0.
A vertical, rectangular water duct 1 m high and 0.10 m deep shown in the sketch is placed in an environment of saturated steam at atmospheric pressure. If the outer surface of the duct is about 50oC,...
See AnswerQ: The 1-m-long, tube-within-a
The 1-m-long, tube-within-a-tube, heat exchanger shown in the sketch is used to condense steam at 2 atm in the annulus. Water flows in the inner tube, entering at 90oC. The inner tube is made of coppe...
See AnswerQ: The one-pass condenser, heat exchanger shown in the sketch
The one-pass condenser, heat exchanger shown in the sketch has 64 tubes arranged in a square array with 8 tubes per line. The tubes are 1.22 m long and are made of copper with an outside diameter of 1...
See AnswerQ: Estimate the cross-sectional area required for a 30-cm
Estimate the cross-sectional area required for a 30-cm-long methanol-nickel heat pipe to transport 30 W at atmospheric pressure.
See AnswerQ: Design a heat pipe cooling system for a spherical satellite that dissipates
Design a heat pipe cooling system for a spherical satellite that dissipates 5000 W/m3, has a surface area of 5 m2, and cannot exceed a temperature of 120oC. All the heat must be dissipated by radiatio...
See AnswerQ: Compare the axial heat flux achievable by a heat pipe using water
Compare the axial heat flux achievable by a heat pipe using water as the working fluid with that of a solid silver rod. Assume that both are 20 cm long, that the temperature difference for the rod fro...
See AnswerQ: Show that the dimensionless equation for ice formation on the outside of
Show that the dimensionless equation for ice formation on the outside of a tube of radius r0 is Assume that the water is originally at the freezing temperature Tf, that the cooling medium inside the t...
See AnswerQ: Compare the critical heat flux for a flat horizontal surface with that
Compare the critical heat flux for a flat horizontal surface with that for a submerged horizontal wire of 3-mm diameter in water at saturation temperature and pressure.
See AnswerQ: Show that the effective conductance, / for two black, parallel
Show that the effective conductance, / for two black, parallel plates of equal area connected by reradiating walls at a constant temperature is
See AnswerQ: Calculate the net radiant-heat-transfer rate if the two
Calculate the net radiant-heat-transfer rate if the two surfaces in Problem 11.18 are black and are connected by a refractory surface with an area of 500 m2. A1 is at 555 K, and A2 is at 278 K. What i...
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