# Solve Problem 15.23 if instead of the surface temperatures being known, the air temperatures outside

Solve Problem 15.23 if instead of the
surface temperatures being known, the air temperatures outside and inside are
30 and 75F, and the
convective heat-transfer coefficients are 7 and 2 Btu/h ft2 F; respectively.

Problem 15.23

The outside walls of a house are
constructed of a 4-in. layer of brick, 1/2 in. of celotex, an air space 3 5/8
in. thick, and 1/4 in. of wood panelling. If the outside surface of the brick
is at 30F and the
inner surface of the panelling at 75F, what is the heat
flux if

a. the air space is assumed to transfer
heat by conduction only?

b. the equivalent
»

Solve Problem 15.23 if instead of the
surface temperatures being known, the air temperatures outside and inside are
30 and 75F, and the
convective heat-transfer coefficients are 7 and 2 Btu/h ft2 F; respectively.

Problem 15.23

The outside walls of a house are
constructed of a 4-in. layer of brick, 1/2 in. of celotex, an air space 3 5/8
in. thick, and 1/4 in. of wood panelling. If the outside surface of the brick
is at 30F and the
inner surface of the panelling at 75F, what is the heat
flux if

a. the air space is assumed to transfer
heat by conduction only?

b. the equivalent conductance of the air
space is 1:8 Btu/ h ft2F?

c. the air space is filled with glass wool?

»

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