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2012/2013

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1.

1-1 1-2,:

a) 196 ,b)

145 .

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:

c) 0=190 f(0)=0,670 W/(mK)

1=200 f(1)= 0,665 W/(mK)

=f(x)= 0,667 W/(mK)

3

T. 1-1

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:

b) 0=140 f(0)=1027 J/(kgK)

1=160 f(1)=1030 J/(kgK)

Cp=f(x)= 1028 J/(kgK)

4

T. 1-1

Str.8

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2.

196 0,667 W/(mK).

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xi=0,667 W/(mK)

x=0,667 W/(mK)

x=| xi - x |

x=0 W/(mK)

=x/ x =| xi - x |/ x

=x/ x *100=| xi - x |/ x*100

=0 %

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3.

: m=m/. L , .

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.

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:

c) m=m/ m|=| MpLqr

m|=|M/ = M-1

m(=) kgs-1

; m(=) kg/s

p=1, q=0, r=-1

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.

.

. ..

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4:

:

a) lbf/in2 bar

b) lbfs/ft2 Pas.

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:

a) lbf/in2 bar

1 lbf=4,44822 N (T.2-10)

Pa=N/m2 (T.2-2)

1in2=6,451610-4 m2 (T.2-6)

1 Pa=110-5 bar

1 lbf/in2=4,44822 N/(6,451610-4m2)=

=0,689475478951104 Pa

= 6,8947547895110-2

bar

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b) (lbfs)/ft2 Pas

1 lbf=4,44822 N (T.2-10)1ft2=9,290310-2 m2 (T.2-6)

1(lbfs)/ft2=4,44822N1s/(9,290310-2m2)=

=47,88026221 Pas

= 47,88026221 Pas

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5.

:a) 84,2 psi Pa, bar

b) 250,63 kJ/(hm2) W/m2

c) 56,0 m2/s ft2/h

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:

a) 1 psi=6,89476103 Pa (T.2-11)

=0,05 psi

=0,56,89476103 Pa =344,738 Pa

100 344,7 1000

344,7 500 ( 1000), 100

84,2 psi=84,26,89476103 Pa=580538,792 Pa

=580500 Pa

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:

a) 1 psi=6,8947610-2 bar (T.2-11)

=0,05 psi

=0,56,8947610-2 bar =3,410-3 bar

10-3 3,410-3 10-2

3,410-3 510-3( 10-2),

10-3 III

84,2 psi=84,26,8947610-2 bar=5,80538792 bar

=5,805 bar

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:

b) W=J/s (T.2-2)

1 h=3600 s (T.2-3)103=k (T.2-4)

=0,005 kJ/(hm2)

=0,005103J/(3600s1m2)=1,410-3 W/m2

10-3 1,410-3 10-2

1,410-3 510-3 ( 10-2),

10-3

III 250,63 kJ/(hm2)=250,63103J/(3600s1m2)=

=69,619444444 W/m2

= 69,619 W/m2

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:

c) 1 m2 =10,764 ft2 (T.2-6)

1 s =1/3600 h (T.2-3)

=0,05 m2/s

=0,00510,764ft2/(1/3600s)=1937,5ft2/h

1000 1937,5 10000

1937,5 5000 ( 10000), 1000

56,0 m2

/s=56,010,764ft2

/(1/3600s)==2170022,4 ft2/h

=2170000 ft2/h

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