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Microchannel condenser, my experience, I ask you your opinion
Good evening, everybody.
I always follow this forum with great interest because it's full of competent people, congratulations.
That is my first post and I am writing to ask you your opinion.
I am a thermodynamic engineer in an Italian company that produces refrigerated cabinet for supermarket
Recently I tested a multideck cabinet with built-in unit condensing, the condenser is a microchannel type.
It 'a very widespread application in the field of large distribution but I don't understand because.
From the tests I did I found many advantages and no disadvantage
The charge gas and 'reduced by 30%.
The temperature of condensation is less than the previous condeser
The pressure is equalized in less time.
The size of the condenser are small, only 2 cm thick.
Better ventilation in the unit condensig compartment.
Lower cost of manufacture.
So many benefits, but this application is not common used , why do you think?.
I apologize in advance for my little English language.
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Re: Microchannel condenser, my experience, I ask you your opinion
Ciao, gianpierone. As in most new products, it takes time from availability to acceptance. As a manufacturer of big chillers, we are using microchannel condensers in sizes up to 6 meters in length and found them to be cheap, reliable and all in all a better alternative to standard Cu/Al condensers.
The main advantage is that these condensers will no longer rely on copper that is becoming an increasingly expensive commodity.
We are now testing microchannel water coils (for free cooling).
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Re: Microchannel condenser, my experience, I ask you your opinion
Gianpierone,
Who is the manufacture of microchannel coils.
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Re: Microchannel condenser, my experience, I ask you your opinion
Are these micro channel coils made just out of aluminium?
How are they joined to copper pipe work?
Jon :)
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Re: Microchannel condenser, my experience, I ask you your opinion
Yes, they are completely made in aluminum. The joint is made with a bolted flange in a gasketed seating
This is how they look like
http://www.docs.hvacpartners.com/idc...crochannel.jpg
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Re: Microchannel condenser, my experience, I ask you your opinion
Hi Michaelm, I have bought condenser microchannel to Val.Mex. in Italy, visit www.valmex.it
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Re: Microchannel condenser, my experience, I ask you your opinion
Hi Monkey , it is possible connecting the microchannel conder with blocks, lokring, nipless, copper pipe (by welding aluminium and copper).
I have used blocks.
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Re: Microchannel condenser, my experience, I ask you your opinion
They look similar in design to vehicle air con condensers, if they are as reliable as the ordinary ones then its seems like a good thing.
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Re: Microchannel condenser, my experience, I ask you your opinion
Very similar Jon. Excellent heat transferre. The only disadvantage when used in vehicles is when metal from a damaged compressor manages to get caught in tubes, however i think some vehicles have removable strainers now.
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Re: Microchannel condenser, my experience, I ask you your opinion
Hi No Nick Name,
are these evaps flooded design.
magoo
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Re: Microchannel condenser, my experience, I ask you your opinion
Quote:
Originally Posted by
gianpierone
Hi Michaelm, I have bought condenser microchannel to Val.Mex. in Italy, visit
www.valmex.it
B"H
Thank you so much.
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Re: Microchannel condenser, my experience, I ask you your opinion
Quote:
Originally Posted by
Magoo
Hi No Nick Name,
are these evaps flooded design.
magoo
No, they are not flooded, and they are not evaporating coils.
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Re: Microchannel condenser, my experience, I ask you your opinion
Carrier and York use microchannel coils on their chillers and are made by a US Company called Delphi
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Re: Microchannel condenser, my experience, I ask you your opinion
these delphi coils tend to leak, already replaced about a dozen coils and would like to get a class action suit started
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Re: Microchannel condenser, my experience, I ask you your opinion
i mayb a rookie poster but if it quacks like duck, walks like a duck most likely it is a duck, n coil is problem
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Re: Microchannel condenser, my experience, I ask you your opinion
Quote:
Originally Posted by
billdozza
i mayb a rookie poster but if it quacks like duck, walks like a duck most likely it is a duck, n coil is problem
What is causing the condensers to fail? Corrosion or quality problems? Vehicle condensers of this type design take a beating from vibration and the elements for years..Mike.
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Re: Microchannel condenser, my experience, I ask you your opinion
Hi Billdozza
Which chillers do you have the coil leaks on.
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Re: Microchannel condenser, my experience, I ask you your opinion
Automotive-style condensers suffer from a number of major failure modes.
The most common are:
1. Galvanic corrosion;
2. Fatigue/vibration failure.
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Re: Microchannel condenser, my experience, I ask you your opinion
Galvanic corrosion mechanism:
The fins are generally clad with aluminium/silicon eutectic material;
The tube is extruded/formed, with no cladding;
After brazing, the tube generally tends to become sacrificial relative to the fin material, with consequent failure mode as tube corrosion.
The fin material can be adapted to move the galvanics around a little & extend corrosion life. This is a juggling act, specific to automotive operation & testing regime.
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Re: Microchannel condenser, my experience, I ask you your opinion
Development of the next generation of copper-copper condensers is in progress.
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Re: Microchannel condenser, my experience, I ask you your opinion
Has anyone got information/facts on these failures?
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Re: Microchannel condenser, my experience, I ask you your opinion
how about danfoss sanhua mchx? any 1 using it?
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Re: Microchannel condenser, my experience, I ask you your opinion
in india danfoss started selling its mchx , any good alternative of danfoss?
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Re: Microchannel condenser, my experience, I ask you your opinion
billdozza,
Can you tell us more about the failures of the microchannel condensers please.
Lawrie