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flash

English translation: change from a high pressure liquid to a low pressure liquid/gas mixture

GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
English term or phrase:flash
Selected answer:change from a high pressure liquid to a low pressure liquid/gas mixture
Entered by: seaMount

20:50 Jan 13, 2005
English language (monolingual) [PRO]
Tech/Engineering - Engineering (general) / refrigerating engineering
English term or phrase: flash
The liquid becomes subcooled and will not flash if exposed to pressure drops in the liquid line.

Could you explain the meaning of "flash" in the above sentence? A client says it can`t be "send a sudden bright light" here. He suggests it means something like "evaporate". Is it possible?
Małgorzata Wikłacz
Poland
Local time: 19:54
change from a high pressure liquid to a low pressure liquid/gas mixture
Explanation:
As the high pressure liquid refrigerant goes through the TXV, it is exposed to the lower pressure of the evaporator which is created by the compressor.
This exposure causes the refrigerant to start to "flash" or change from a high pressure liquid to a low pressure liquid/gas mixture.
This existing mixture has heavy liquid at the bottom and the lighter vapor at the top.
http://www.outokumpu.com/pages/Page____18588.aspx

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Note added at 12 mins (2005-01-13 21:02:37 GMT)
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so, \'will not flash is \'will not change\' ...
Selected response from:

seaMount
Local time: 19:54
Grading comment
But thank you for all the answers!!!
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
4 +3flash
Clauwolf
3 +4change from a high pressure liquid to a low pressure liquid/gas mixture
seaMount
3 +3not for grading
Nilgün Bayram (X)
5evaporate (under the pressure drops in the liquid line)
Mark Xiang
4see definition given below
conejo


  

Answers


6 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5 peer agreement (net): +3
flash


Explanation:
:)...will not pass from liquid to gas

Clauwolf
Local time: 14:54
Works in field
Native speaker of: Native in PortuguesePortuguese
PRO pts in category: 8

Peer comments on this answer (and responses from the answerer)
agree  Nilgün Bayram (X)
24 mins
  -> thanks
agree  Will Matter: another way to put it: Will not suddenly and spontaneously go from a liquid state to a gaseous state due to a sudden drop in pressure.
1 hr
  -> thanks
agree  Jörgen Slet: suddenly or violently
4 hrs
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7 mins   confidence: Answerer confidence 4/5Answerer confidence 4/5
see definition given below


Explanation:
The Flash Point of a chemical is the lowest temperature at which a flame will propagate through the vapour of a combustible material to the liquid surface. It is determined by the vapour pressure of the liquid, since only when a sufficiently high vapour concentration is reached, can it support combustion. It should be noted that the source of ignition need not be an open flame, but could equally be, for example, the surface of a hot plate, or a steam pipe.


    Reference: http://ptcl.chem.ox.ac.uk/MSDS/glossary/flashpoint.html
conejo
United States
Local time: 12:54
Works in field
Native speaker of: English

Peer comments on this answer (and responses from the answerer)
neutral  Will Matter: This "flash" is not the "flash" of "flash point" but instead, refers to the rapid, spontaneous change from a liquid to a gas (due to decompression) because it happens very, very, very quickly. It's all over in a "flash", you might say :)
1 hr
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11 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +4
change from a high pressure liquid to a low pressure liquid/gas mixture


Explanation:
As the high pressure liquid refrigerant goes through the TXV, it is exposed to the lower pressure of the evaporator which is created by the compressor.
This exposure causes the refrigerant to start to "flash" or change from a high pressure liquid to a low pressure liquid/gas mixture.
This existing mixture has heavy liquid at the bottom and the lighter vapor at the top.
http://www.outokumpu.com/pages/Page____18588.aspx

--------------------------------------------------
Note added at 12 mins (2005-01-13 21:02:37 GMT)
--------------------------------------------------

so, \'will not flash is \'will not change\' ...

seaMount
Local time: 19:54
Native speaker of: Native in DutchDutch, Native in EnglishEnglish
PRO pts in category: 4
Grading comment
But thank you for all the answers!!!

Peer comments on this answer (and responses from the answerer)
agree  Will Matter: Yes. Said essentially the same thing above before I saw your answer. You're correct.
1 hr
  -> thank you
agree  Jörgen Slet: in the given system (liquid line)
4 hrs
  -> thank you
agree  Java Cafe
6 hrs
  -> thank you
agree  juvera
13 hrs
  -> thank you juvera!
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33 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +3
not for grading


Explanation:
As the pressure in the liquid line drops, progressively more liquid will flash into vapor to cool the remaining liquid to the saturation temperature corresponding to the progressively lower pressure. With an 55.15 kPa (8 psi) pressure drop, the flash gas, by weight, will be 2% with a 37.77oC (100oF) condensing temperature. The vapor bubbles in the liquid line are now very compressed and occupy only 20% of the volume in the liquid line.

However, reduce the condensing temperature to 10.0oC (50oF) and the flashing vapor will occupy 38% of the liquid line volume.

http://www.hysave.co.uk/technical/science_technology.html


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Note added at 42 mins (2005-01-13 21:32:24 GMT)
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http://www.colmaccoil.com/pdf/IOMcondenser.pdf


SUBCOOLER PIPING:Refrigerant liquid leaving the condenser is typically at saturation temperature, and pressure. If the liquid has not beensubcooled before it enters the liquid line, any drop in pressure, or any heat input, will cause the liquid to boil, and “flash gas”is formed. This flash gas will cause an excessive pressure drop in the liquid line, and will greatly reduce the capacity ofthe TX valve, and the system. Adequate subcooling of the liquid will prevent the formation of flash gas.


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Note added at 1 hr 33 mins (2005-01-13 22:23:12 GMT)
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As the heat is removed from the refrigerant, it reaches it’s “saturated temperature” and starts to “flash” (change states), into a high pressure liquid.

The cooler refrigerant in the evaporator tubes, absorb the warm room air. The change of temperature causes the refrigerant to “flash” or “boil”, and changes from a low pressure liquid to a low pressure cold vapor.





Nilgün Bayram (X)
Türkiye
Local time: 20:54
Specializes in field
Native speaker of: Turkish

Peer comments on this answer (and responses from the answerer)
agree  Will Matter
1 hr
  -> thanks but I just gave the supporting explanation to Clauwolf's answer.
agree  Jörgen Slet
4 hrs
  -> thanks
agree  Java Cafe
6 hrs
  -> thanks
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11 hrs   confidence: Answerer confidence 5/5
evaporate (under the pressure drops in the liquid line)


Explanation:
The liquid will not evaporate even it is exposed to the pressure drops in the liquid line because it has been subcooled.

Mark Xiang
Local time: 01:54
Native speaker of: Native in ChineseChinese
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