A common arrangement for heating a large surface areais to
Chapter 4, Problem 4.67(choose chapter or problem)
A common arrangement for heating a large surface areais to move warm air through rectangular ducts belowthe surface. The ducts are square and located midwaybetween the top and bottom surfaces that are exposed toroom air and insulated, respectively.1.5LConcreteT1 = 80CT2 = 30CAir ductLLLxyT= 20Ch = 50 W/m2Kt = 20 mmL = 50 mm171216192128131720391418410155116 269CH004.qxd 2/21/11 8:53 AM Page 269 For the condition when the floor and duct temperaturesare 30 and 80C, respectively, and the thermal conductiv-ity of concrete is 1.4 W/m?K, calculate the heat rate fromeach duct, per unit length of duct. Use a grid spacing withx?2y, where ? .125Land L?150 mm.
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