p8.3-18 - T zone and therefore provides heating to the...

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8.3-18 A steam coil is used to provide heating to a zone of a building. The coil has geometry consistent with finned tube fc_tubes_sCF-775-58T in the compact heat exchanger library. The coil is installed in a square air duct with width W = 18 inch and height H = 18 inch. The coil can be installed in modules that are placed in series. The length of each module in the flow direction is L mod = 6 inch. The volumetric flow rate of air entering the coil is in V ± = 900 cfm. The air enters the coil at T a,in = -5ºC. The condensing steam in the coil is two-phase throughout and at pressure p s = 10 psi. The temperature of the zone is T zone = 20ºC. Air is heated in the steam coil and enters the zone at a temperature greater than T zone . The air leaves the zone at
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Unformatted text preview: T zone and therefore provides heating to the zone. The blower that moves the air through the coil has an efficiency of η b = 0.55. You may neglect fouling and assume that the efficiency of the fins on the air-side is 100%. Further, you may neglect the convection resistance associated with the condensing steam and conduction through the tubes. a.) If only one module is installed, determine the power required by the blower, the temperature of the air leaving the steam coil, and the heat provided to the zone. b.) Plot the heat provided to the zone and the blower power as a function of the number of modules. Explain the shape of your plot. How many modules would you suggest using for the steam coil? Why?...
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This note was uploaded on 08/11/2008 for the course ME 364 taught by Professor Rothamer during the Summer '08 term at University of Wisconsin.

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