Overall heat transmission

It is necessary to consider the heat transfer from inside air to outside air. The heat transfer processes include conduction, convection, and radiation simultaneously.

T„

Ri

«2

1. O’

1

X

<

Qi

Q2

Q <

R

V

подпись: r
v

Overall heat transmission

1Til T.

X

11+1

X-

 

Overall heat transmission

X.

 

Overall heat transmission

Ti

Rtv

Rri

X

подпись: xQ Ro = T0 — Ti

Q Ri = Ti — T2

Q Ri= T„+i — T„

___ q Ri = Tn^j — Tj___________

+) q[R0+(ERJ)+RJ = T0-TI

J=i

T — T

Q =— 1——————————-

R0+(Јr,)+r,

J=i

N

R =R0 + Rj) + R; (Overall thermal resistance)

J=i

U =1/R (Overall heat transfer coefficient)

Example 5.3

Continue to work on example 6.1 to determine the outdoor and indoor air temperatures.

Solution:

O

Posted in Fundamentals of Heating. Ventilating, and Air-Conditioning


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