CEN/TR 17603-31-17:2022
(Main)Space engineering - Thermal analysis handbook
Space engineering - Thermal analysis handbook
This handbook is dedicated to the subject of thermal analysis for space applications. Thermal analysis is an important method of verification during the development of space systems. The purpose of this handbook is to provide thermal analysts with practical guidelines which support efficient and high quality thermal modelling and analysis.
Specifically, the handbook aims to improve:
1.the general comprehension of the context, drivers and constraints for thermal analysis campaigns;
2.the general quality of thermal models through the use of a consistent process for thermal modelling;
3.the credibility of thermal model predictions by rigorous verification of model results and outputs;
4.long term maintainability of thermal models via better model management, administration and documentation;
5.the efficiency of inter-organisation collaboration by setting out best practice for model transfer and conversion.
The intended users of the document are people, working in the domain of space systems, who use thermal analysis as part of their work. These users can be in industry, in (inter)national agencies, or in academia. Moreover, the guidelines are designed to be useful to users working on products at every level of a space project - that is to say at system level, sub-system level, unit level etc.
In some cases a guideline could not be globally applicable (for example not relevant for very high temperature applications). In these cases the limitations are explicitly given in the text of the handbook.
Raumfahrttechnik - Handbuch für thermische Analyse
Ingénierie spatiale - Manuel d'analyse thermique
Vesoljska tehnika - Priročnik o toplotni analizi
Ta priročnik je posvečen toplotni analizi za vesoljske tehnike. Toplotna analiza je pomembna metoda preverjanja pri razvoju vesoljskih sistemov. Namen tega priročnika je analitikom toplote zagotoviti praktične smernice, ki podpirajo učinkovito in visokokakovostno toplotno modeliranje oziroma analizo.
Natančneje, namen priročnika je izboljšati:
1. splošno razumevanje konteksta, ključnih dejavnikov in omejitev za izvedbo toplotne analize;
2. splošno kakovost toplotnih modelov z uporabo doslednega procesa toplotnega modeliranja;
3. verodostojnost napovedi toplotnega modela s strogim preverjanjem rezultatov in izhodnih podatkov modela;
4. dolgoročno vzdržljivost toplotnih modelov z boljšim upravljanjem, administracijo in dokumentacijo modelov;
5. učinkovitost medorganizacijskega sodelovanja z določitvijo dobre prakse za prenos in pretvorbo modelov.
Predvideni uporabniki dokumenta so osebe, ki delajo na področju vesoljskih sistemov in pri svojem delu uporabljajo toplotno analizo. To so lahko uporabniki v industriji, v (med)nacionalnih agencijah ali v akademskih krogih. Poleg tega so smernice zasnovane tako, da jih lahko uporabljajo tudi tisti, ki delajo na vseh ravneh vesoljskega projekta – to je na ravni sistema, ravni podsistema, ravni enote itd.
V nekaterih primerih smernice ni mogoče uporabiti globalno (na primer ni pomembna za uporabo pri zelo visokih temperaturah). V teh primerih so omejitve izrecno navedene v besedilu priročnika.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-marec-2022
Vesoljska tehnika - Priročnik o toplotni analizi
Space engineering - Thermal analysis handbook
Raumfahrttechnik - Handbuch für thermische Analyse
Ingénierie spatiale - Manuel d'analyse thermique
Ta slovenski standard je istoveten z: CEN/TR 17603-31-17:2022
ICS:
49.140 Vesoljski sistemi in operacije Space systems and
operations
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
TECHNICAL REPORT CEN/TR 17603-31-17
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
January 2022
ICS 49.140
English version
Space engineering - Thermal analysis handbook
Ingénierie spatiale - Manuel d'analyse thermique Raumfahrttechnik - Handbuch für thermische Analyse
This Technical Report was approved by CEN on 29 November 2021. It has been drawn up by the Technical Committee
CEN/CLC/JTC 5.
CEN and CENELEC members are the national standards bodies and national electrotechnical committees of Austria, Belgium,
Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia,
Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
CEN-CENELEC Management Centre:
Rue de la Science 23, B-1040 Brussels
© 2022 CEN/CENELEC All rights of exploitation in any form and by any means
Ref. No. CEN/TR 17603-31-17:2022 E
reserved worldwide for CEN national Members and for
CENELEC Members.
Table of contents
European Foreword . 6
1 Scope . 7
1.1 Objectives and intended audience . 7
1.2 Context .7
2 References . 9
3 Terms, definitions and abbreviated terms . 11
3.1 Terms from other documents . 11
3.2 Terms specific to the present document . 12
3.3 Abbreviated terms. 13
4 Modelling guidelines . 16
4.1 Model management . 16
4.2 Model configuration and version control . 17
4.3 Modelling process . 17
4.4 Modularity and decomposition approach . 19
4.5 Discretisation . 19
4.5.1 Overview . 19
4.5.2 Spatial discretisation and mesh independence . 20
4.5.3 Observability . 20
4.5.4 Time discretisation . 21
4.5.5 Input parameters . 22
4.6 Transient analysis cases. 23
4.7 Modelling thermal radiation . 23
4.7.1 Introduction to thermal radiation . 23
4.7.2 Radiative environment . 24
4.7.3 Thermo-optical properties . 25
4.7.4 Transparency and optical elements . 26
4.7.5 Spectral dependency . 26
4.7.6 Radiative cavities . 27
4.7.7 Geometrical modelling . 28
4.8 Considerations for non-vacuum environments . 29
4.8.1 General . 29
4.8.2 Specific regimes . 29
4.8.3 Conduction or convection . 29
4.8.4 Heat transfer coefficient correlation . 30
4.8.5 Charge/discharge of gas inside pressurised systems . 30
5 Model verification . 31
5.1 Introduction to model verification . 31
5.2 Topology checks . 31
5.3 Steady state analysis . 32
5.4 Finite element models . 33
5.5 Verification of radiative computations. 34
6 Uncertainty analysis . 35
6.1 Uncertainty philosophy . 35
6.2 Sources of uncertainties . 36
6.2.1 General . 36
6.2.2 Environmental parameters . 36
6.2.3 Physical parameters . 37
6.2.4 Modelling parameters . 37
6.2.5 Test facility parameters . 37
6.3 Classical uncertainty analysis . 38
6.4 Stochastic uncertainty analysis . 39
6.5 Typical parameter inaccuracies . 39
6.6 Uncertainty analysis for heater controlled items . 41
7 Model transfer, conversion and reduction . 42
7.1 Model transfer . 42
7.1.1 Introduction to model transfer . 42
7.1.2 Analysis files and reference results . 42
7.1.3 Documentation . 44
7.1.4 Portability of thermal models . 44
7.2 Model conversion. 45
7.2.1 Introduction to model conversion . 45
7.2.2 Management of thermal model conversions . 46
7.2.3 Model conversion workflow . 47
7.2.4 Verification of radiative model conversions . 50
7.2.5 Verification of thermal model (TMM) conversions . 52
7.3 Model reduction . 52
7.3.1 Introduction to model reduction . 52
7.3.2 Management . 53
7.3.3 Model reduction guidelines . 53
7.3.4 Model reduction correlation success criteria . 54
7.3.5 Model reduction approaches . 55
Annex A Specific guidelines . 57
A.1 Multilayer insulation . 57
A.1.1 Introduction . 57
A.1.2 Modelling principles . 57
A.1.3 Modelling patterns . 58
A.2 Heat pipes . 58
A.2.1 Introduction . 58
A.2.2 Modelling principles . 59
A.2.3 Modelling patterns . 59
A.2.4 Design verification . 59
A.2.5 Model verification . 60
A.3 Layered materials . 60
A.3.1 Modelling principles . 60
A.3.2 Modelling patterns . 60
A.4 Electronic units . 63
A.4.1 Introduction . 63
A.4.2 Physical data and modelling advice . 64
Figures
Figure 1-1: Thermal analysis in the context of a space project . 8
Figure 4-1: Modelling process . 18
Figure 4-2: Examples of cavities: top showing two completely closed cavities, bottom
showing two almost separated cavities with a small opening . 27
Figure 7-1: Diagram for the ideal model conversion workflow . 47
Figure 7-2: Activity diagram for conversion workflow - Conversion done by developer. . 48
Figure 7-3: Activity diagram for conversion workflow - Conversion done by recipient. . 48
Figure 7-4: Comparison of converted GMM radiative couplings . 51
: Typical heat pipe nodal topology . 59
: Example of verifying heat pipe heat transport capability . 60
: Typical electronic unit thermal network . 63
Tables
Table 6-1: Typical parameter inaccuracies (pre-phase A and phase B) . 39
Table 6-2: Typical parameter inaccuracies (phase B and phase C/D) . 40
Table 7-1: Model reduction methods . 55
European Foreword
This document (CEN/TR 17603-31-17:2022) has been prepared by Technical Committee
CEN/CLC/JTC 5 “Space”, the secretariat of which is held by DIN.
It is highlighted that this technical report does not contain any requirement but only collection of data
or descriptions and guidelines about how to organize and perform the work in support of EN16603-
31.
This Technical report (CEN/TR 17603-31-17:2022) originates from ECSS-E-HB-31-03A.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CEN by the European Commission and
the European Free
...
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