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A solar collector design consists of an inner tube enclosed concentrically in an outer tube that is transparent to solar radiation. The tubes are thin walled with inner and outer diameters of 0.10 and 0.15 m, respectively. The annular space between the tubes is completely enclosed and filled with air at atmos- pheric pressure. Under operating conditions for which the inner and outer tube surface temperatures are 70 and 30°C, respectively, what is the convective heat loss per meter of tube length across the air space?
a solid circular shaft and a tubular shaft both with the same outer radius of cco 0.600in are being considered for a
propane gas enters a continuous adiabatic heat exchanger at 40degc and 250 kpa and exits at 240degc superheated steam
Consider two ideal gases, A and B that are initially separated. For each of the following processes, the gases are allowed to mix. Determine if the entropy change of the system is positive, negative, or zero. Explain. (a) The process occurs isotherma..
Consider a concentric pipe with inner radius of Rin and outer radius of Rout. The flow is laminar and in the direction of the axis of the pipes. Obtain the velocity profile for this geometry, u(r); and also expressions for the maximum velocity, the m..
the first accurate mesurements of the properties of high-pressure gases were made by e.h. amagat in france between 1869
a 250-kg crate b is suspended from a cable attached to a 20-kg trolley a which rides on an inclined i-beam as shown.
As part of a super-critical extraction of coal, an initially evacuated cylinder is fed with steam from a line available at 20 mPa and 400 degrees C. What is the temperature in the cylinder immediately after filling? (Answer to problem is 454 degrees ..
a steel bar 2-meters long and having a square cross-section 2-cm on an edge is pulled in tension with a load of 100000
the minimum fresh air requirement of a residential building is specified to be 0.35 air change per hour ashrae standard
Evaluate the mean gas temperature, Tm - what is the rate per unit axial length at which electrical energy must be supplied to each element to maintain its prescribed temperature?
Estimate the heat loss per unit length if a 50-mm-thick layer of insulation (magnesia with k = 0.058 W/m-K) is added. The steel and magnesia may each be assumed to have an emissivity of 0.8, and the steam-side convection resistance may be neglecte..
the mass center of the rear-engine 3200-lb car is at g. determine the normal forces na an nb exerted by the road on the
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