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To determine the combined radiation andconvection coefficient, hr + hc, at varioustemperatures from different surfaces.

Bare pipe

Painted pipe

Pipe with Silver chrome paint

Pipe with 85% magnesia insulation

To determine the Lagging Efficiency, L.E.

To compare the experimentally determined valuesof hc and hr with those calculated from empiricalequations.

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Boiler

Test pipes

Bare pipe Painted pipe

Pipe with Silver chrome paint

Pipe with 85% magnesia insulation

Thermometers Beakers

Graduated cylinders

Stopwatch

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Make three runs with steam at approximately 10 psi g, 20psig and 30 psig

For each run: After adjusting the system to the desired pressure, crack the

drain cock under the header to remove water from the steamline and header. Open the four plug type valves to blow out any condensate

from the pipes, and then close them until only a small amount ofsteam escapes along with the condensate.

When the system has reached equilibrium, as determined bysurface temperature measurements, collect and measure the

condensate from each pipe over a timed interval of 15 to 30minutes, and during this period record the following data: Barometric pressure Room temperature Steam pressure and temperature Surface temperatures

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Surface temperatures should be taken at three ormore equally spaced points along each test pipe,and at least three sets of readings should be takenduring each run.

(NOTE: Because steam rising from the condensate valvestends to heat the pipes and insulation, no temperaturemeasurements should be made within 20 inches of the exitends of the pipes)

From the experimental data for each run, calculatethe combined film coefficients for convection andradiation and the lagging efficiencies.

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Fix the boiler and leaks.

Perform more experiments to be able to

acquire reasonable data.