TM-882 1738.000 CC1 Report No. 390-108 TURBO EXPANDER FOR ...

TM

TM-882

1738.000

CC1 Report

No.

390-108

TURBO EXPANDER FOR SATELLITE REFRIGERATOR

PREPARED UNDER FERMILAB SUBCONTRACT NO. 94199

BY CRYOGENIC CONSULTANTS, INC.

ALLENTOWN, PA.

FOR

FERMI NATIONAL ACCELERATOR LABORATORY

BATAVIA, ILLINOIS

APRIL

1979

882

TM-882

TURBO EXPANDER ¡®FOR SATELLITE¡¯ REFRIGERATOR

1.

¡®INTRODUCTION :

satellite

refrigerators

are equipped with

Presently,

reciprocating

expansion

engines.

The question

has arisen

whether

turbines

could replace

these engines in order to

achieve

greater

reliability.

This report

evaluates

the

feasibility

of equipping

the satellite

refrigerator

with

turbo expanders.

2.

SATELLITE

REFRIGERATOR ¡®PROCESS:

Figure

1 shows the process

flow sheet of the satellite

refrigerator

cold box (below 80¡¯K).

Tables I, II, and

III

give the significant

process points

for satellite

operation,

refrigerator

operation,

and liquefier

operation,

respectively.

The values

of the tables

have been calculated

on the

performance

data of the expanders:

of the following

a)

Warm Expander:

Inlet

Pressure

Discharge

Pressure

Efficiency

W

Mode:

I

=

=

m

Wet Expander/Satellite

Inlet

Pressure

Inlet

Temperature

Discharge

Pressure

Efficiency

20.0 atm

1.4 atm

621

.

Wet Expander/Liquefier

Inlet

Pressure

Inlet

Temperature

Discharge

Pressure

Efficiency

Cl

h

20.0 atm

8.15¡¯K

1.8 atm

561

Mode:

I

=

=

m

-l-

20 atm

5.24¡¯K

1.8 ata

578

basis

TM-882

I

I

I

1

I9

TM-882

Pres.

Pqint

dt'a

nwp

%O,

Flow Rate

g/set

.

Ic

1

20.8

80

434.4

46.1

2

20.5

25.07

138.8

46.1

3

20.5

25.07

138.8

46.!

4

20.1

15.6

5

20.0

6

77.76

46.1

5.24

21.84

46.1

1.8

4.75

13,l

46.1

7

1.22

4.4

29.94

50.0

8

1.19

13.15

81.55

50.0

9

1.16

23.8

137.84

50.0

10

1.11

76.2

410.42

50.0

25.07

138.8

-O-

11

20.0

"13

c

k

12

1.22

11.91

, 4.4

'T x 'B' 'L E

-O3.9

'T' 'T.

Enthalpy

J'/'g'r

Flow Rate

g/set

81

439.6

50.0

20.5

30

166.9

50.0

3

20.5

30

166.9

35.06

4

20.1

18

5

20.0

6

7

Point

Pres.

tits

T,zmp

K

1

20.8

2

l

96.67

35.06

5.7

23.34

35.06

1.8

4.9

14.4

35.06

1.22

4.4

29.94

35.06

-3-

TM-882

TABLE I.1 (Continued)

Pres.

at¡¯s

Point

8

Flow Rate

gj's'e'c

103.27

17.25

1.20

50.0

9

10

11

12

1.11

20.5

1.20

'

?9

425.2

50.0

30

166.9

14.94

17.25

103.27

14.94

..-

13

Point

35.06

*!

-o-

'Flow Rate

g/'sec

Pres.

&ta

50.0

1

20.8

80

2

20,o

25.07

138.8

50.0

3

20.0

25.07

138.8

13.34

4

20.0

14.7

5

20.0

6

75.86

13.34

8.15

33.66

13.34

1.8

4.9

24.66

13.34

7

1.22

4.4

29.94

9.68

8

1.20

14.4

88.1

9.68

9

1.20

17.8

106.22

46.34

10

1.11

79

425.2

46.34

25.07

138.8

36.66

88.1

36.66

11

20.0

12

1.20

13

1. 2.2.

14.4

3.66

4..4

-4-

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