Thermodynamics HW Solutions 20

Thermodynamics HW Solutions 20 - Chapter 1 Basics of Heat...

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Chapter 1 Basics of Heat Transfer 1-41 The ducts of an air heating system pass through an unheated area, resulting in a temperature drop of the air in the duct. The rate of heat loss from the air to the cold environment is to be determined. Assumptions 1 Air is an ideal gas since it is at a high temperature and low pressure relative to its critical point values of -141 ° C and 3.77 MPa. 2 The kinetic and potential energy changes are negligible, . 3 Constant specific heats at room temperature can be used for air. This assumption results in negligible error in heating and air-conditioning applications. ΔΔ ke pe ≅≅ 0 Properties The specific heat of air at room temperature is C p = 1.007 kJ/kg· ° C (Table A-15). Analysis We take the heating duct as the system. This is a control volume
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This note was uploaded on 01/14/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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