Displacer Control Program

98:

0

O

O

91:

W0

94:

§

CTl

O

O

97:

00

101:

0

5

+

105

O0

109

W0

112

A0

114

L 112 1

118

R 1333

122

W10

125

G 0 1

130

W0

133

A8

135

L133 1

139

R 0

143

W10

146

G 0 1

подпись: 98: -
0
o
o
91: w0
94: §
ctl
o
o
97: 00
101: 0
5
+
105 o0
109 w0
112 a0
114 l 112 1
118 r 1333
122 w10
125 g 0 1
130 w0
133 a8
135 l133 1
139 r 0
143 w10
146 g 0 1
Rotate CCW until a limit is hit Wait until complete Wait 500ms Set origin

Back off limit by a margin of 50 steps Set origin at this point Wait until complete

Sets port 3 low (indicates moving CW) Stays at instruction 112 until Port 1 is high Rotate 120 degrees CW Wait 0.1s

Test ports 1-3, branch based on result Wait until complete

Sets port 3 high (indicates moving CCW) Stay at 133 until port 1 is high Return to origin Wait 0.1s

[Start of go branch table]

256:

@

257:

A8

259:

G139 1

2:

7

2

1

2

CTl

288:

5

O

292:

A8

4:

9

2

9

3

G1

304:

5

O

308:

G133 1

320:

@

321:

A0

323:

G118 1

6:

3

3

5

2

G1

352:

0

5

+

356:

W0

359:

O0

363:

A0

365:

G118 1

368:

+50

372:

W0

375:

O0

379:

A0

381:

G112 1

448:

0

2

3

G

464:

G336 1

480:

G352 1

496:

G336 1

подпись: [start of go branch table]
256: @
257: a8
259: g139 1
2:
7
2 1
2
ctl
288: 5
o
292: a8
4:
9
2 9
3
g1
304: 5
o
308: g133 1
320: @
321: a0
323: g118 1
6:
3
3 5
2
g1
352: 0
5
+
356: w0
359: o0
363: a0
365: g118 1
368: +50
372: w0
375: o0
379: a0
381: g112 1
448: 0
2
3
g
464: g336 1
480: g352 1
496: g336 1
Test ports 1-3, branch based on result

Soft stop

Sets port 3 high (indicates moving CCW) Rotate to CCW endpoint

Goto instruction 125

CW Lmit reached, pulse received Sets port 3 high (indicates moving CCW) Goto 139

Back off by a margin of 50 steps CW Lmit reached, goto instruction 133

Soft stop

Sets port 3 low (indicates moving CW) Goto 118 (Rotate 120 degrees CW)

Goto instruction 125

Back off limit by margin of 50 steps Wait until complete Set origin

Sets port 3 low (indicates moving CW) Goto 1113

Back off limit by margin of 50 steps Wait until complete Set origin

Sets port 3 low (indicates moving CW) Goto 112

[End of go branch table]

III. (3 ^ 4) Isothermal expansion: This stage occurs as the power piston is travelling outwards, being pushed by the heated expanding gas and increasing the overall volume which in turn lowers its pressure. The amount of work done by the expanding gas on the piston, We, is equal to the area under the p-V diagram between points 3 and 4. During this part of the cycle, heat is added by the heater from the outside environment.

1 x 106 x 0.438 = —^—————— = 23 MPa

Finally the NTU and efficiency can be found:

H. Sreo 404x 70

A = g = ———— = 4.53

M. cp 6.24x 1000

[2] x 0.0095

Axial Stress

Axial stress, 0^, is caused by pressure acting on the end caps. It is the force pulling the tube

Apart from the ends and is calculated as:

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