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Swsp

English translation: SHGC or G value (unshaded)

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
French term or phrase:Swsp
English translation:SHGC or G value (unshaded)
Entered by: Johannes Gleim

17:51 Sep 7, 2020
French to English translations [PRO]
Tech/Engineering - Construction / Civil Engineering / Thermal efficiency of windows
French term or phrase: Swsp
Swsp: Facteur solaire pour les fenêtres sans protection (le facteur solaire Swsp indique le pourcentage de chaleur solaire collectée par la fenêtre vers l'intérieur du logement).

This concerns the energy efficiency of windows. I have looked it up and I think the abbreviation might be SHGC in English, but could anyone please confirm this?

Thank you
Jane Golding
United Kingdom
Local time: 22:15
SHGC or G value (unshaded)
Explanation:
I start with the French Wikipedia page added to BDs translation of Sw https://www.proz.com/kudoz/french-to-english/construction-ci...

Le facteur solaire d’une paroi est le rapport entre l’énergie due au rayonnement solaire transmise et l’énergie reçue par la paroi. Cette paroi peut être de toutes sortes, opaque, vitrée etc.
:
Le facteur solaire g ou transmission énergétique
:
Il représente la somme du rayonnement transmis et celle du rayonnement absorbé puis retransmis vers l'intérieur par le vitrage.
:
Aux États-Unis, c'est principalement le Solar Heat Gain Coefficient (SHGC) qui est utilisé, et anciennement le Shading Coefficient (SC).
https://fr.wikipedia.org/wiki/Facteur_solaire

Solar gain through windows includes energy transmitted directly through the glass and energy absorbed by the glass and frame and then re-radiated into the space.
:
G-value (sometimes also called a Solar Factor or Total Solar Energy Transmittance) is the coefficient commonly used in Europe to measure the solar energy transmittance of windows. Despite having minor differences in modeling standards compared to the SHGC, the two values are effectively the same. A g-value of 1.0 represents full transmittance of all solar radiation while 0.0 represents a window with no solar energy transmittance. In practice though, most g-values will range between 0.2 and 0.7, with solar control glazing having a g-value of less than 0.5
Solar Heat Gain Coefficient (SHGC)
SHGC is the successor to the shading coefficient used in the United States and it is the ratio of transmitted solar radiation to incident solar radiation of an entire window assembly. It ranges from 0 to 1 and refers to the solar energy transmittance of a window or door as a whole, factoring in the glass, frame material, sash (if present), divided lite bars (if present) and screens (if present).[2] The transmittance of each component is calculated in a similar manner to the shading coefficient. However, in contrast to the shading coefficient, the total solar gain is calculated on a wavelength-by-wavelength basis
https://en.wikipedia.org/wiki/Solar_gain#G-Value

See also https://fr.wikipedia.org/wiki/Vitre#Le_facteur_solaire_g_ou_...

Calculating the Effect of External Shading on the Solar Heat Gain Coefficient of Windows
:
The Solar Heat Gain Coefficient (SHGC) is a common metric for characterizing the amount of solar gain that enters through a building component. It is most relevant for non-opaque parts of the building envelope such as windows and skylights. It is defined as the ratio of the incident solar radiation and the heat gain through the building component due to this solar gain.
:
We can quantify the effect that the shade is having on the SHGC of the window by calculating the SHGC of the window without shades and the aSHGC with external shades in place
[formule]
Where 𝑄unshaded is the amount of solar energy transmitted through the window due to the incident solar radiation without a shade. 𝐼dir+diff,unshaded is the total amount of solar radiation that is incident on the window without the presence of an external shade. Of note is that the aSHGC value is calculated with the unshaded incident solar radiation. This is the key aspect in calculating the adjusted SHGC (aSHGC) value, which indicates the SHGC of the window with a shade present.
:
Conclusion
The presented method uses two standard tools (EnergyPlus and Berkeley Lab WINDOW) to calculate a seasonal weighted adjusted SHGC which accounts for the effect of external shading. This method can be referenced by building codes to allow them to properly account for the effect of a shade on the SHGC of a window.
https://windows.lbl.gov/sites/default/files/lbnl-2001057.pdf

I conclude from this that the Solar Heat Gain Coefficient of Windows (SHGC) is in fact the term researched and equals to the G value. This is also confirmed by the given definition:

Swsp: Facteur solaire pour les fenêtres sans protection (le facteur solaire Swsp indique le pourcentage de chaleur solaire collectée par la fenêtre vers l'intérieur du logement).
Or in English:
SHGC: Solar factor for unshaded windows (the SHGC solar factor indicates the percentage of solar heat collected by the window towards the inside of the dwelling).
(the SHGC considers the whole window, i.e. panes and frames)

while aSHGC is the shaded equivalent. I see no real difference between « Sw » and « Swsp ». Both are translated by "SHGC or G value" depending on the target country.


--------------------------------------------------
Note added at 1 day 15 hrs (2020-09-09 09:41:32 GMT)
--------------------------------------------------

Very easy to goggle for "Swsp" "Facteur solaire", e.g.

Facteur solaire pour les fenêtres sans protection (le facteur solaire Swsp indique le pourcentage de chaleur solaire collectée par la fenêtre vers l'intérieur du logement).
https://journaldemonaco.gouv.mc/Journaux/2020/Journal-8499/A...
(Arrêté Ministériel n° 2020-539)

1.2 Facteur de transmission solaire S
Le facteur solaire global de la paroi vitrée, déterminé selon ce fascicule, caractérise la capacité de la paroi à transmettre le rayonnement solaire entre les deux milieux qu’elle sépare
:
1.3 Facteur de transmission lumineuse TL
Le facteur de transmission lumineuse de la paroi vitrée, déterminé selon ce fascicule, caractérise la capacité de la paroi à transmettre le rayonnement lumineux entre les deux milieux qu’elle sépare

1.5.2 Symboles et indices
1.5.2.1 Coefficient U

Tableau II: Indices
s Lame d’air ou de gaz, fermeture, store intérieur, extérieur ou entre vitrage
w Fenêtre ou porte fenêtre nue
ws Fenêtre, porte ou porte fenêtre nue avec fermeture ou store
p Panneau opaque

1.5.2.2 Facteur solaire S
Tableau III: Nomenclature pour le facteur solaire

Pour la norme XP P50-777, les indices de caractérisation des composants sont les suivants:
o w: paroi vitrée associée à ses éléments opaques sans protection rapportée en place;
o ws: paroi vitrée associée à ses éléments opaques avec protection rapportée en place.
Dans le cadre du facteur de transmission lumineuse, on retient les notations suivantes:
o sp,b: ramené à la baie, avec prise en compte de l’intégration à l’ouvrage, sans protection rapportée en place;

2.9.3.2Calcul du facteur de transmission solaire Sw

3.2.2 Formules générales
3.2.2.1 Paroi transparente ou translucide sans protection rapportée en place
L’application de la méthode conduit aux résultats suivants:
Tableau XVII: Sorties des facteurs de transmission solaire pour les cas courants de baies sans protection rapportée
Résultat de l’application de la méthode
C | E
Swsp-c,b | Swsp-e,b
http://www.rt-batiment.fr/IMG/pdf/3-fascicule_parois_vitrees...

Sur la base des indices mis en évidence, j'interprète les indices individuels comme suit :
- Fenêtre, porte ou porte fenêtre nue avec fermeture ou store
- avec lame d’air ou de gaz, fermeture, store intérieur, extérieur ou entre vitrage
- et vitrage.

Based on the highlighted indices I can retain my proposal, and apply it to the specific application:
- Bare window, door or French window with closure or sunshade
- with air or gas layer, closure, internal or external blind or between glazing
- and opaque panel.

--------------------------------------------------
Note added at 1 day 16 hrs (2020-09-09 09:57:48 GMT)
--------------------------------------------------

Correction d'un erreur de frappe :

- Fenêtre, porte ou porte fenêtre nue avec fermeture ou store
- avec lame d’air ou de gaz, fermeture, store intérieur, extérieur ou entre vitrage
- et panneau opaque.
Selected response from:

Johannes Gleim
Local time: 23:15
Grading comment
Thank you very much.
4 KudoZ points were awarded for this answer



Summary of answers provided
5SHGC or G value (unshaded)
Johannes Gleim
Summary of reference entries provided
Swsp
Emmanuella

Discussion entries: 10





  

Answers


22 hrs   confidence: Answerer confidence 5/5
SHGC or G value (unshaded)


Explanation:
I start with the French Wikipedia page added to BDs translation of Sw https://www.proz.com/kudoz/french-to-english/construction-ci...

Le facteur solaire d’une paroi est le rapport entre l’énergie due au rayonnement solaire transmise et l’énergie reçue par la paroi. Cette paroi peut être de toutes sortes, opaque, vitrée etc.
:
Le facteur solaire g ou transmission énergétique
:
Il représente la somme du rayonnement transmis et celle du rayonnement absorbé puis retransmis vers l'intérieur par le vitrage.
:
Aux États-Unis, c'est principalement le Solar Heat Gain Coefficient (SHGC) qui est utilisé, et anciennement le Shading Coefficient (SC).
https://fr.wikipedia.org/wiki/Facteur_solaire

Solar gain through windows includes energy transmitted directly through the glass and energy absorbed by the glass and frame and then re-radiated into the space.
:
G-value (sometimes also called a Solar Factor or Total Solar Energy Transmittance) is the coefficient commonly used in Europe to measure the solar energy transmittance of windows. Despite having minor differences in modeling standards compared to the SHGC, the two values are effectively the same. A g-value of 1.0 represents full transmittance of all solar radiation while 0.0 represents a window with no solar energy transmittance. In practice though, most g-values will range between 0.2 and 0.7, with solar control glazing having a g-value of less than 0.5
Solar Heat Gain Coefficient (SHGC)
SHGC is the successor to the shading coefficient used in the United States and it is the ratio of transmitted solar radiation to incident solar radiation of an entire window assembly. It ranges from 0 to 1 and refers to the solar energy transmittance of a window or door as a whole, factoring in the glass, frame material, sash (if present), divided lite bars (if present) and screens (if present).[2] The transmittance of each component is calculated in a similar manner to the shading coefficient. However, in contrast to the shading coefficient, the total solar gain is calculated on a wavelength-by-wavelength basis
https://en.wikipedia.org/wiki/Solar_gain#G-Value

See also https://fr.wikipedia.org/wiki/Vitre#Le_facteur_solaire_g_ou_...

Calculating the Effect of External Shading on the Solar Heat Gain Coefficient of Windows
:
The Solar Heat Gain Coefficient (SHGC) is a common metric for characterizing the amount of solar gain that enters through a building component. It is most relevant for non-opaque parts of the building envelope such as windows and skylights. It is defined as the ratio of the incident solar radiation and the heat gain through the building component due to this solar gain.
:
We can quantify the effect that the shade is having on the SHGC of the window by calculating the SHGC of the window without shades and the aSHGC with external shades in place
[formule]
Where 𝑄unshaded is the amount of solar energy transmitted through the window due to the incident solar radiation without a shade. 𝐼dir+diff,unshaded is the total amount of solar radiation that is incident on the window without the presence of an external shade. Of note is that the aSHGC value is calculated with the unshaded incident solar radiation. This is the key aspect in calculating the adjusted SHGC (aSHGC) value, which indicates the SHGC of the window with a shade present.
:
Conclusion
The presented method uses two standard tools (EnergyPlus and Berkeley Lab WINDOW) to calculate a seasonal weighted adjusted SHGC which accounts for the effect of external shading. This method can be referenced by building codes to allow them to properly account for the effect of a shade on the SHGC of a window.
https://windows.lbl.gov/sites/default/files/lbnl-2001057.pdf

I conclude from this that the Solar Heat Gain Coefficient of Windows (SHGC) is in fact the term researched and equals to the G value. This is also confirmed by the given definition:

Swsp: Facteur solaire pour les fenêtres sans protection (le facteur solaire Swsp indique le pourcentage de chaleur solaire collectée par la fenêtre vers l'intérieur du logement).
Or in English:
SHGC: Solar factor for unshaded windows (the SHGC solar factor indicates the percentage of solar heat collected by the window towards the inside of the dwelling).
(the SHGC considers the whole window, i.e. panes and frames)

while aSHGC is the shaded equivalent. I see no real difference between « Sw » and « Swsp ». Both are translated by "SHGC or G value" depending on the target country.


--------------------------------------------------
Note added at 1 day 15 hrs (2020-09-09 09:41:32 GMT)
--------------------------------------------------

Very easy to goggle for "Swsp" "Facteur solaire", e.g.

Facteur solaire pour les fenêtres sans protection (le facteur solaire Swsp indique le pourcentage de chaleur solaire collectée par la fenêtre vers l'intérieur du logement).
https://journaldemonaco.gouv.mc/Journaux/2020/Journal-8499/A...
(Arrêté Ministériel n° 2020-539)

1.2 Facteur de transmission solaire S
Le facteur solaire global de la paroi vitrée, déterminé selon ce fascicule, caractérise la capacité de la paroi à transmettre le rayonnement solaire entre les deux milieux qu’elle sépare
:
1.3 Facteur de transmission lumineuse TL
Le facteur de transmission lumineuse de la paroi vitrée, déterminé selon ce fascicule, caractérise la capacité de la paroi à transmettre le rayonnement lumineux entre les deux milieux qu’elle sépare

1.5.2 Symboles et indices
1.5.2.1 Coefficient U

Tableau II: Indices
s Lame d’air ou de gaz, fermeture, store intérieur, extérieur ou entre vitrage
w Fenêtre ou porte fenêtre nue
ws Fenêtre, porte ou porte fenêtre nue avec fermeture ou store
p Panneau opaque

1.5.2.2 Facteur solaire S
Tableau III: Nomenclature pour le facteur solaire

Pour la norme XP P50-777, les indices de caractérisation des composants sont les suivants:
o w: paroi vitrée associée à ses éléments opaques sans protection rapportée en place;
o ws: paroi vitrée associée à ses éléments opaques avec protection rapportée en place.
Dans le cadre du facteur de transmission lumineuse, on retient les notations suivantes:
o sp,b: ramené à la baie, avec prise en compte de l’intégration à l’ouvrage, sans protection rapportée en place;

2.9.3.2Calcul du facteur de transmission solaire Sw

3.2.2 Formules générales
3.2.2.1 Paroi transparente ou translucide sans protection rapportée en place
L’application de la méthode conduit aux résultats suivants:
Tableau XVII: Sorties des facteurs de transmission solaire pour les cas courants de baies sans protection rapportée
Résultat de l’application de la méthode
C | E
Swsp-c,b | Swsp-e,b
http://www.rt-batiment.fr/IMG/pdf/3-fascicule_parois_vitrees...

Sur la base des indices mis en évidence, j'interprète les indices individuels comme suit :
- Fenêtre, porte ou porte fenêtre nue avec fermeture ou store
- avec lame d’air ou de gaz, fermeture, store intérieur, extérieur ou entre vitrage
- et vitrage.

Based on the highlighted indices I can retain my proposal, and apply it to the specific application:
- Bare window, door or French window with closure or sunshade
- with air or gas layer, closure, internal or external blind or between glazing
- and opaque panel.

--------------------------------------------------
Note added at 1 day 16 hrs (2020-09-09 09:57:48 GMT)
--------------------------------------------------

Correction d'un erreur de frappe :

- Fenêtre, porte ou porte fenêtre nue avec fermeture ou store
- avec lame d’air ou de gaz, fermeture, store intérieur, extérieur ou entre vitrage
- et panneau opaque.


Johannes Gleim
Local time: 23:15
Works in field
Native speaker of: German
PRO pts in category: 189
Grading comment
Thank you very much.
Notes to answerer
Asker: Thank you very much for your help. This seems to be correct,


Peer comments on this answer (and responses from the answerer)
neutral  B D Finch: NB The American SHGC is similar but not identical to the Sw or g-value. I believe that the Sw and g-value both conform to the European standard. Also, Britain, being colder, favours a higher g-value (0.5 to 0.7) than France (0.45)
21 hrs
  -> Similar and identical for practical use. It's ot a matter of belief, but of research. We do not discuss what g value is preferred in different contries, either.
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Reference comments


10 mins
Reference: Swsp

Reference information:
https://www.commercialwindows.org/shgc.php

Emmanuella
Italy
Native speaker of: French

Peer comments on this reference comment (and responses from the reference poster)
neutral  B D Finch: That is the US version of a solar factor, which isn't exactly the same as the European one. The British G-value is, I believe, based on the European standard. Also, it doesn't answer the question for Swsp.
1 hr
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