Results 51 to 72 of 72
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24-07-2007, 03:30 AM #51
Re: Refrigeration System with Ammonia
TXiceman / US Iceman Thanks for your tips
The anti-siphon hole in the top of the inlet elbow inside the vessel is very import
Thanks again
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24-07-2007, 03:56 AM #52
Re: Refrigeration System with Ammonia
These are the items and tips you do not find in books. Similar to using vortex breakers in other vessels.
Last edited by US Iceman; 24-07-2007 at 03:57 AM. Reason: spelling
If all else fails, ask for help.
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25-07-2007, 05:57 PM #53
Re: Refrigeration System with Ammonia
I grew up in a loging camp next to a hydrodam and a fish hatchery, and seeing how the water would form vortexes at every chance/ fast forward to now/ I all ways wondered how they dealt with any vortexes that would form in the ***** systems! Especialy the larger receivers!? Neat how they do it with the NH3.
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26-07-2007, 03:03 PM #54
Re: Refrigeration System with Ammonia
I use the same type vortex breaker in ammonia or "*****" systems. But you do need a vortex breaker at every liquid outlet of a vessel, whether it is to a pump of let down to another vessel.
Ken
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30-07-2007, 02:55 PM #55
Re: Refrigeration System with Ammonia
Hello Samarjit Sen
I would recommendate a two-stage-system with CO2 as lowstage refrigerant and ammonia in the high stage circle. You can design a DX system if have some coldstorage application and a flooded system for freezing tunnels. If you built a flooded system with CO2 watch out for the oil return concept, because compressoroil is in general terms miscible with CO2.
Best regards
Rinaldo1Z from Switzerland
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30-07-2007, 03:11 PM #56
Re: Refrigeration System with Ammonia
Welcome to the RE forums Rinaldo1Z. Can you tell us what type of work you do in Switzerland? You can post your reply in the Introduction area of the site.
Look forward to seeing future contributions from you.If all else fails, ask for help.
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01-08-2007, 06:47 PM #57
Re: Refrigeration System with Ammonia
Hi Rinaldo1Z,
Sorry for the delay in replying. We do not have many plants of CO2 in our country, but there is a project where Ice Cream is to be hardened and subsequently stored. The hardening tunnel will be at -40oC and the Storage at -30oC. I would like to use CO2/NH3 for this application.
Can anyone provide me with a schemetic diagram for the this system. It is like any other cascade system, but what I would like to know are the safety features and the equipments to be incorporated.
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06-08-2007, 03:58 PM #58
Re: Refrigeration System with Ammonia
Dear Mr.Sen
You are intending to harden the ice cream. The recomended temperature for the same is -40 deg.C and even below. -25 to -18 is the preservation temperature of the hardened ice cream.
Size of the each batch and the production of the ice cream per day will decide the type and the size of the refrigeration system to be employed.
you should specify the same.
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06-08-2007, 05:15 PM #59
Re: Refrigeration System with Ammonia
Dear Mr. Varde,
Ice Cream starts hardening from -18oC core temperature. Generally the Hardening Rooms or the Hardening Rooms are maintained at -40oC. At this temperature usually the hardening is completed within 6 hrs time if not earlier. We have installed some Hardening Rooms with R 22 system and had no problem.
I am now interested in using CO2 as the refrigerant for the hardening chambers. I am seeking information on this and other than the forum, I have collected informations from other sources.
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12-08-2007, 03:22 PM #60
Re: Refrigeration System with Ammonia
Dear Samarjit,
You can go for open type screw compressor of single stage machine or two stage reciprocating compressor with flooded type evaporator. You can source evaporator & compressors from OEMs .other shell & tube condenser and receiver can be source localy but manufacturing standard should be compile with ASME CODES.
THANKS
Ramesh Mysore
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12-08-2007, 06:20 PM #61
Re: Refrigeration System with Ammonia
Hi Ramesh Mysore,
It is nice to have you here. I am trying out the various application and learning the system with Ammonia. As you know in our country, Ammonia System mis still pretty old, due to which there are frequest failures. In this forum you will find members who are vary learned and helpful.
I have also noted your suggestion. Please PM to me your contact number.
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27-04-2008, 05:58 AM #62
Re: Refrigeration System with Ammonia
Hello Mike,
It is a old thread and more to my present requirement. At present we propose to use a single two stage ammonia compressor with two evaporators. The defrost system we propose to use is electrical. The Evaporators are from Kuba, Germany. These Evaporators have bottom feed.
In the drawing attached in this thread, you shown a drawing with top feed. Should there be any change.
Need your assistance for making the layout.
Thanks in advance
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17-05-2008, 01:53 PM #63
Re: Refrigeration System with Ammonia
Dear Samarjit Sen,
GEA Grasso makes two stage ammonia recip. compressors. And this compressors
has well proved to be in our country.
Grasso's recip. compressors are fully welded, the main advantage of this type of construction is the absence of water cooling on the compressor resulting in lower investment and running costs. The externally positioned “air cooled” cylinders make use of natural heat dissipation by means of convection & radiation. At present, when the price for water is expensive enough, this condition is one of main in a choice of the compressor.
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17-05-2008, 02:45 PM #64
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01-06-2008, 11:02 PM #65
Re: Refrigeration System with Ammonia
i am new at this forum, and has followd this topic.
i have a great interest in NH³ , and want to now how this story has ended.
wat kind of compressor was aventualy used, is there a drowing we can see, or the explaned setup for this particular plant.
wat is eventualy the outcome??
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03-06-2008, 09:03 AM #66
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14-06-2008, 02:20 PM #67
Re: Refrigeration System with Ammonia
I would like to ask if You have any catalogues with technical data for freezing tunnels and if yes, can You provide these catalogues for me. If not, can You please tell me or give me directions where I can find the information I need.
Thank You in advance
.
Regards,
eng. Miroslava Rasheva
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28-09-2009, 08:37 PM #68
Re: Refrigeration System with Ammonia
Hi all, pls can anybody explain to me what is the pump rate for example 5:1, 4:1
Thanks
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29-09-2009, 05:43 PM #69
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29-11-2009, 06:09 PM #70
Re: Refrigeration System with Ammonia
30 TR not worth to go to ammonia and flooded system you can use dx system, however if you read frick bulletins from york can giveyou a good guidelines for the custom engineered systems, you have to select compressor, then condnser (heat of condenser equal compressor power plus refrigeration inyour case 30 TR =100 kw,
you have to select receiver, surge or recirculated vessel (equivalent to throttling)
as a rule of thump (two third of reciver volume =condenser volume + evaporator volume and 10% for tubes)
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05-03-2010, 04:33 PM #71
Re: Refrigeration System with Ammonia
[QUOTE=Gaafar;168749]30 TR not worth to go to ammonia and flooded system you can use dx system,
It's often more economical over the life of a system to use ammonia even for 100 kW. Over the years, I've built several 75 kW flooded ammonia systems economically. In fact I built 3 or 4 systems of about that size in Saudi back ion the late 90's.
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02-12-2010, 11:03 AM #72
Re: Refrigeration System with Ammonia
Dear Miroslava Rasheva,
If you need freezing tunnels you can look next companies:
Aerofreeze Systems
http://www.aerofreeze.com/en-ca/Pages/default.aspx,
Eurotek Engeneering
http://www.eurotek-eng.co.uk/
Intec
http://www.intecvrt.com/