160:
148:
234:
196:
128:, and various sensors for monitoring performance. The Nitrogen Tank Assembly (NTA) controls the flow of ammonia out of the Ammonia Tank Assembly (ATA). The ATA contains two flexible, chambers incorporated into its ammonia tanks that expand as pressurized nitrogen from the NTA expels liquid ammonia out of the ATA. The major components in the ATA include two ammonia storage tanks, isolation valves, heaters, and various temperature, pressure, and quantity sensors;
222:
36:
28:
137:
172:
246:
184:
208:
258:
20:
131:
Heat
Rejection - Ammonia passes from the ATA through a two way path of the Flex Hose Rotary Coupler (FHRC) where heat captured while passing through the Heat Exchangers is directed to be expelled through the Heat Rejection System Radiators (HRSRs). The radiators are rotated by the Thermal Rotary
277:
123:
Heat
Transportation - The Pump Module (PM) provides flow and accumulator functions and maintains proper temperature control at the pump outlet for each Loop. The PM consists of a single pump, a fixed charge accumulator, a Pump & Control Valve Package (PCVP) containing a firmware controller,
87:
in closed-loop circuits. The EATCS is capable of rejecting up to 70 kW, and provides a substantial upgrade in heat rejection capacity from the 14 kW capability of the Early
External Active Thermal Control System (EEATCS) via the Early Ammonia Servicer (EAS), which was launched on
115:
as well as cold plates under three DC-to-DC Conversion Units (DDCUs) (one DDCU each on each Loop on the P1/S1 Trusses and two DDCUs each on each Loop on the S0 Truss) and two Main Bus
Switching Units (MBSUs) on each Loop on the S0 Truss (see schematic below and
269:
51:(EATCS) maintains an equilibrium when the ISS environment or heat loads exceed the capabilities of the Passive Thermal Control System (PTCS). Note Elements of the PTCS are external surface materials, insulation such as
387:
343:
348:
233:
159:
99:
There are two independent Loops (Loop A & Loop B) that combined make up the EATCS. The EATCS Loops perform three primary functions:
147:
195:
372:
221:
83:
Trusses. The EATCS consists of two independent Loops (Loop A & Loop B), which both use mechanically pumped fluid state
325:
44:
331:
93:
80:
76:
72:
366:
360:
354:
337:
117:
112:
245:
52:
68:
171:
108:
104:
60:
276:
207:
183:
64:
301:
125:
35:
27:
132:
Radiator Joint (TRRJ) which continually rotates the radiator wing for optimum cooling.
103:
Heat
Collection - Each Loop draws heat from five Heat Exchangers (HXs) mounted on the
381:
257:
136:
56:
268:
89:
84:
275:
267:
135:
34:
26:
19:
71:(COF), and the main power distribution electronics of the
23:
ISS External Active
Thermal Control System (EATCS) diagram
63:
capabilities for all the U.S. pressurized modules, the
344:
296:
294:
16:International Space Station thermal control system
302:"Active Thermal Control System (ATCS) Overview"
239:FHRC without MLI cover and in situ on the TRRJ
388:Components of the International Space Station
349:Environmental Control and Life Support System
8:
18:
290:
217:
143:
49:External Active Thermal Control System
272:EATCS components on the S1/P1 Trusses
251:Heat Rejection System Radiator (HRSR)
7:
120:(ORUs) for design of these units);
14:
256:
244:
232:
220:
206:
194:
182:
170:
158:
146:
227:Flex Hose Rotary Coupler (FHRC)
373:Scientific research on the ISS
1:
177:Nitrogen Tank Assembly (NTA)
326:International Space Station
213:ATA drawing (cover removed)
201:Ammonia Tank Assembly (ATA)
189:NTA drawing (cover removed)
45:International Space Station
404:
332:Integrated Truss Structure
65:Japanese Experiment Module
367:ExPRESS Logistics Carrier
361:External Stowage Platform
338:Orbital Replacement Units
118:Orbital Replacement Units
69:Columbus Orbital Facility
355:Integrated Cargo Carrier
140:EATCS schematic overview
92:and installed onto the
281:
273:
141:
53:Multi-Layer Insulation
40:
39:DDCU cold plate design
32:
31:Early Ammonia Servicer
24:
280:TCS System of the ISS
279:
271:
139:
59:. The EATCS provides
38:
30:
22:
282:
274:
142:
105:Destiny Laboratory
41:
33:
25:
124:startup heaters,
395:
313:
312:
306:
298:
260:
248:
236:
224:
210:
198:
186:
174:
162:
153:Pump Module (PM)
150:
126:isolation valves
403:
402:
398:
397:
396:
394:
393:
392:
378:
377:
322:
317:
316:
304:
300:
299:
292:
287:
264:
261:
252:
249:
240:
237:
228:
225:
214:
211:
202:
199:
190:
187:
178:
175:
166:
163:
154:
151:
17:
12:
11:
5:
401:
399:
391:
390:
380:
379:
376:
375:
370:
364:
358:
352:
346:
341:
335:
329:
321:
318:
315:
314:
289:
288:
286:
283:
266:
265:
262:
255:
253:
250:
243:
241:
238:
231:
229:
226:
219:
216:
215:
212:
205:
203:
200:
193:
191:
188:
181:
179:
176:
169:
167:
164:
157:
155:
152:
145:
134:
133:
129:
121:
61:heat rejection
15:
13:
10:
9:
6:
4:
3:
2:
400:
389:
386:
385:
383:
374:
371:
368:
365:
362:
359:
356:
353:
350:
347:
345:
342:
339:
336:
333:
330:
327:
324:
323:
319:
310:
303:
297:
295:
291:
284:
278:
270:
259:
254:
247:
242:
235:
230:
223:
218:
209:
204:
197:
192:
185:
180:
173:
168:
161:
156:
149:
144:
138:
130:
127:
122:
119:
114:
110:
106:
102:
101:
100:
97:
95:
91:
86:
82:
78:
74:
70:
66:
62:
58:
54:
50:
46:
37:
29:
21:
308:
263:HRSR drawing
98:
48:
42:
67:(JEM), the
285:References
165:PM drawing
57:Heat Pipes
55:(MLI), or
382:Category
320:See also
351:(ECLSS)
96:Truss.
90:STS-105
85:ammonia
369:(ELCs)
363:(ESPs)
357:(ICCs)
340:(ORUs)
113:Node-3
111:&
109:Node-2
47:(ISS)
334:(ITS)
328:(ISS)
305:(PDF)
309:NASA
79:and
43:The
384::
307:.
293:^
107:,
94:P6
81:P1
77:S1
75:,
73:S0
311:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
