More CO2 and Glycol Training
Here we go again. I keep reading threads about CO2 and all of the mis-information out there on the subject of CO2. This is not a new refrigerant. If you use it as a low temperature secondary fluid the pressures are around 220-240 PSIG operating pressure. If you use it as a secondary medium temp fluid your operatng pressures are around 400-440 PSIG. AND dont forget its .50cents a lb. There are about 25 system using CO2 as a secondary low temp fluid in the USA. There is one Cascade system using low temp CO2/glycol medium tmep. And 2 systmes located in the south that use CO2 as a medium and low temp refrgerant None of these systems are used in transcritical operation. If you are really intrested in how these systems work, HP will be conducting training classes around the country. I will post all up comming classes for those who want to come. It is not a Sales class. See the infor on the upcomming classes in Atlanta in March. My opinon is Ammiona is also a future option for supermarkets. I start taking my first Ammiona class on Monday.
Hill Phoenix is having an upcoming Regional Training Program in Atlanta GA. This class is geared to the service tech and the installers, our goal is to teach in an open format all things secondary (glycol and CO2). The training is open to anyone intrested in learning this new technology. The classes are as follows:
March 16th 8:00-5:00 Sencondary glycol installation startup and troubleshooting. Great class for mech and tech
March 17th 8:00 - 12:00 Geroge Fischer pipe (Plastic refrigeration pipe glycol only) This class will certifiy you in the installation of GF piping.
March 17th 1:00 - 5:00 Compact Chiller Modules. Secondary system the use about 50 - 80 lb of HFC for the entire mediuim temp rack (Very Kool)
March 18th 8:00 - 1:00 CO2 installlation, Startup, and Troubleshooting.
If you mention that you saw this thread you will receive a 20% discount on the classes.
To registor please contact firstname.lastname@example.org or email@example.com
HP hats and screwdriver will be provided.
Originally Posted by eng&tech
Thanks for the info I collect screwdrivers and hats.
All jokes aside why do you think Amonia is going to be a popular refrigerant in supermarkets. are you talking about using Amonia in thw wharehouses or out on the salesfloor? I am skeptical that any chain would want to have an amonia store. Sounds like a law suit waiting to happen to me.
My thoughts are amonia will be used on the primary side and glycol as the secondary for medium and CO2 fluid as the secondary side for low temp.
There are several such systems in the US already like this. Mainly warehouse use but would be vrey functional for the whole market.
Exactly the system that I am envisioning, too.
Originally Posted by FSE_
This summer, I was talking to my local HP rep and made a comment to the effect of "when they ban HFCs, we're only going to be left with CO2 and Ammonia."
He didn't say anything, but got this funny look like he knew something.
As government regulations increase, Ammonia is THE alternative.
Highly recommend this class. Not for beginners though. You have to thoroughly understand DX refrigeration, gas laws, liquid behavior, etc...
If you really understand control strategies and energy penalties, the conversation gets fun.
PS: Don't call the grey pipe PVC
Although I have to say, now that I am involved with systems, on a small market scale, as in Europe, I have no issues with Transcritical CO2. And in self contained cases, there is no issue at all. IMHO
I have to agree with FSE, I think we use a small amount of Ammiona on the roof in a machnice house as the primary DX refrigerant, cooling etiher propalenye glycol for medium temp or CO2 can be used as a secondary medium temperature fluid with a pressure range between 400 - 500 psig. Then on the low temperature we can use CO2 in a cascade sytem, and condense the CO2 at 20 degrees still have a discharge pressure of ~ 400- 500 pounds. The ammiona charge would be small enough that you would not need an enginner on site.
Now we have a system with NO HFC enviormentally benign, we have a refrigerant the cost .50 cents a pound. Everyone wins - the Customer, the contractors (Remodling store to meet GOV standers) OEMs (selling new equiment) and the planet!!
AND for those of you who dont belive these changes are coming and its all just a fad, Go ahead contiune to do business as usual, but for me I'm going to learn all I can about this new technioligy, and if it happens and Im one of the few dudes who can work on HFC DX systems, secondary CO2 and glycol
systems and AMMIONA!! I may finally get payed what I think I'm worth lolol
Dont get me wrong I have no idea who is right in this envoirmental agruement I've read white papers and articals for both sides and I've dicide that I dont care who right!! There gold in the color green and we all need to make a little of it!!!!!!!!!!!
It was great having you in class your contrubution was appricated. I understand about the new pic, but I like the old one
You seem like a guy who has a finger on the up-and-coming technology.
What is your take on the various non-refrigeration type of cooling systems like thermo-electric?
Do you think it has a chance or is it pie-n-the-sky dreaming?
Thermo-electric cooling - Peltier Effect- Google this for more info
Originally Posted by jpsmith1cm
You heat one side of a electircal plate while cooling the other side. If you need to defrost or simple want to switch between heating and cooling just switch the polaraty the DC voltage.
The thing about thermo-electric cooling right now is the modules are small and costly, but the technoiligy works, We see it in car seats the have the ability to heat and cool the driver or the passager. Also I belive Coleman has some coolers that you can plug into your cig lighter for camping or ball games to keep beer cool They work using a DC power, I could see them working in small under-the counter prep tables. Nothing large,
There also seems to be growning intrest in Thermal-accostic cooling, I've just stated looking into that so I'm not sure how that works.
I worked with a couple of guys and we built a small condensing unit that ran off a car battery( DC Power) it had a Danfoss Copressor used in marine appicaltions and we were able to keep temp in a small meat case for about 3days before the battery lost its charge. We ran out of money and stop testing it, our goal was to recharge the batterys with solar power but we never got that far. ANyone want to invest
Don't forget about Acoustic refrigeration! But again, small scale and not practical at this time
Sweet! Back to open-drive compressors. Unless someone decides to build one with stainless steel windings.
Originally Posted by eng&tech
I like the idea of seeing ammonia on a more regular basis, but i think there will be hurdles in bringing it to the mass market. First, there are issues with getting approval in local government due to lack of understanding, and perceived dangers in the event of a release. Second, its generally more costly for initial installation due to material requirements, socket weld steel pipe in lieu of copper tubing, etc. Overall, the ammonia systems we see are generally used for ice rink applications, with propylene as a secondary refrigerant. These are much more efficient than r22, and generally less issue to service, except if there is some issue with high discharge superheat which causes plant issues, specifically with oil seperators. To me, its kinda old time refrigeration, and i would love to see more of it. as far as co2, there are systems using that already in place for comfort cooling and server cooling.