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Homework __4 solution_2008

# Homework __4 solution_2008 - ix(2 points Hot side...

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EGRM 303 Thermal Systems Design Homework #4 Due February 19, 2008 4:00 pm 1.) (20 points total) Visit Engineering East Room E3219 to analyze the large Alfa Laval Plate Heat Exchanger located near the window. Visiting hours are: Monday February 11 - Friday February 15: 8:30 am - 4:30 pm i.) (1 point) Print your name, sign your name, record date and time on the sign-in sheet. Do NOT sign-in for anyone else. Examine the HX nameplate and the HX manual to determine: ii.)(1 points) Design Pressure: ____150 psi______________________ iii.) (2 points) Design Temperature: ___194 deg. F________________________ iv.) (2 points) Plate Material: ____AISI 304 Stainless__________________________ v.) (2 points) Number of Plates: ____19__________________________ vi.) (2 points) Plate Thickness: _______0.40 mm ____________________ vii.) (2 points) Gasket Material = Nitrile____ __ viii.) (2 points) Heat Transfer Surface Area: _40.24 sq. ft__________________________

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Unformatted text preview: ix.) (2 points) Hot side flowrate: ____198.1 GPM_____________________________ x.) (2 points) Cold side pressure drop: ____14.17 psi________________________ xi.) (2 points) Flow direction on the gasket side of plate five _________Up________________________ 2.) The walls of a refrigerator are constructed of a layer of fiberglass insulation between two sheet metal panels. Consider a wall with an area of 0.5 m 2 . For the sheet metal (each panel), assume that the thermal conductivity is 75 W/m ⋅ K and the thickness is 2 mm. For the fiberglass, assume that the thermal conductivity is 0.05 W/m ⋅ K and the thickness is 25 mm. The air inside the refrigerator is 8 ° C and the air outside the fridge is 25 ° C. The convection coefficients inside and outside are 5 W/m 2 ⋅ K. a.) Using the resistance method, determine the overall heat transfer coefficient (U) for this wall. b.) What is the heat transfer rate in Watts?...
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Homework __4 solution_2008 - ix(2 points Hot side...

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