Talk:Scroll compressor

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Involute[edit]

The involute of a circle is not actually an archemedian (spelling wrong, sorry) spiral, while it is a 'parallel curve' the involute of a circle does not start at the origin. I respect most of you won't care, but really.... the link to involutes is strong and meaningful, involute gears for example they ensure the line of force is a line, I don't want to word it wrongly though, so if someone who is a slight-mathematician could... 95.148.92.139 (talk) 16:03, 12 April 2012 (UTC)[reply]

Paragraph about CO2 needs clarification or deletion[edit]

"There is an industry trend toward developing systems operating on CO2 refrigerant.[11][12][13][14] While CO2 has no ozone depletion potential, it is very difficult to achieve a reasonable cycle efficiency using CO2 as compared to other conventional refrigerants, without having substantial expenditures on enhancing the system with large heat exchangers, vapor injection options, expanders, etc. In case of CO2, the reciprocating compressor appears to offer the best option, as it is difficult to design an efficient and reliable scroll compressor for this application."

This paragraph doesn't explain why it might be difficult to design an efficient and reliable scroll compressor for CO2 and I doubt that it's true. It is, after all, just another element that is a major component of the mixture we call "air", which is easily compressed in a scroll compressor. I note that the final sentence is unsourced, and the remainder of the paragraph is not applicable to scroll compressors, so unless I see a compelling source added that justifies the statement in question, I will at some future point simply delete the paragraph without further warning. Dlw20070716 (talk) 01:48, 12 December 2013 (UTC)[reply]

I went ahead and deleted the paragraph. It turned out that three of the four citations are no longer available and the fourth one doesn't mention scroll compressors. Dlw20070716 (talk) 02:07, 12 December 2013 (UTC)[reply]

This article needs additional citations for verification[edit]

Added several peer-reviewed and business journal citations to help support this page. R2T2M (talk) 18:10, 9 May 2019 (UTC)[reply]

Content dump[edit]

I have copy edited a recent contribution by an apparently non-native user of English, and removed a large portion which was added in a block under an inappropriate section heading and with referencing which I cannot access. Some of it may be useful but I am not sufficiently au-fait with the subject so rather than let it disappear in the history I'm pasting it below, in case anyone wants to pick out the bones and weave properly it into the article. Cheers! Captainllama (talk) 21:30, 8 December 2019 (UTC)[reply]

The scroll machine was patented in 1905 by Creux.^[1] However, the first industrial applications of scroll machines dated from the 1980s, with the introduction into the market of refrigerant scroll compressors. Today, the scroll compressor is a dominant technology in the HVAC&amp ;R industry. In air conditioning systems it is very common to use a number of scroll expanders in parallel because it increases the load sharing mechanism and part-load performance. In scroll expanders, the moment at which discharge and suction take place is only a function of expander’s geometry and the RPM at which it is working. These expanders normally work at pressure ratios of around 10. These expanders are capable of handling wet operations hence there are no devastating effects like we observe in common turbines due to impingement of liquid drops on the surface of the blades. The reason behind this is due to the low RPM at which scroll expanders work. Hence it doesn’t matter that the fluid is inside vapor dome or outside. Hence the wet operations are possible. Fluid velocities also play their part in determining this ability. These positive displacement machines have some advantages over turbines; first, they are available at a cheaper price (in the eventuality of mass-production such as in HVAC), their ability to handle a liquid phase (particularly interesting for Organic Rankine cycle applications) and their lower rotational speeds.^[2] These technologies are still limited to niche market applications characterized by small powers. Developments of positive displacement expander’s beneficiate from developments of compressors: increase of performance and reliability, an extension of operating ranges, etc.^[3].

References

^ US 20170204861, Koyama, Shuhei & Ishigaki, Takashi, "Scroll compressor", issued 2014-09-19
^ Cite error: The named reference Emhardt was invoked but never defined (see the help page).
^ Yang, Jingye; Sun, Ziyang; Yu, Binbin; Chen, Jiangping (2018-08-01). "Modeling and optimization criteria of scroll expander integrated into organic Rankine cycle for comparison of R1233zd(E) as an alternative to R245fa". Applied Thermal Engineering. 141: 386–393. doi:10.1016/j.applthermaleng.2018.06.001. ISSN 1359-4311.

Tagged dead link works for me[edit]

@BrownHairedGirl: Are you sure that link is dead? It works for me: [1]. Or could AWB be getting confused because it's returning a PDF file instead of HTML? Ether way, I'll probably end up filling that and other bare refs. — voidxor 21:03, 9 February 2022 (UTC)[reply]

Hi @Voidxor: it's not actually WP:AWB that does the check. AWB is calling a Perl script, which checks the HTTP status and tags a URL as dead only if the server explicitly returns a HTTP status of 404 ("not found") or the rarer 410 "gone". It's a very simple script running a simple test, so there is no mistake; and it tags a URL as dead only when there is that explicit statement from the server that it is "not found" or "gone". The nature of the page requested is irrelevant.

I have seen some other rare cases where a miscinfogured web server has sent a false 404. Luckily, they are rare.

I think that its best to treat this link as unreliable, and add an archive link. In this edit[2] I have just archived all the refs on the article.

Note that this task only tests WP:Bare URLs, to help avoid WP:LINKROT. If the ref is filled using a {{Cite web}} template, then my script ignores it. It would be good to fill all the bare URL refs, and those which have filled with by bots with the placeholder title "Archived copy". BrownHairedGirl (talk) • (contribs) 21:47, 9 February 2022 (UTC)[reply]

Yeah, I figured it was some AWB add-on that was doing an HTTP status check, rather than something manual. The thought that it could be a false 404 also crossed my mind. Since I use Chromium, I just found instructions here, but as far as I can tell, that particular URL is returning an HTTP status code of 200. Oh well, it has a citation template and archive URL now, so your script should be happy going forward. — voidxor 22:14, 9 February 2022 (UTC)[reply]

[1] US 20170204861, Koyama, Shuhei & Ishigaki, Takashi, "Scroll compressor", issued 2014-09-19

[Emhardt-2] Cite error: The named reference Emhardt was invoked but never defined (see the help page).

[3] Yang, Jingye; Sun, Ziyang; Yu, Binbin; Chen, Jiangping (2018-08-01). "Modeling and optimization criteria of scroll expander integrated into organic Rankine cycle for comparison of R1233zd(E) as an alternative to R245fa". Applied Thermal Engineering. 141: 386–393. doi:10.1016/j.applthermaleng.2018.06.001. ISSN 1359-4311.

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