Need Hydrocarbon Refrigeration System
I am from Indonesia. Hydrocarbon is begening to popular n Indonesia. However, their application are only for small appliance.
Since the electricity cost become higher, many superstore and building owner try to get some new efficient system. Hydrocarbon is promising bbut no famous HVAC producer will allow the use of hydrocarbon in their machine, other wise they will terminate the waranty system.
Are they any HVAC system especially in UK that can be used. HVAC system at 12000 TR is urgently need to repace the R-11 system.
Regards,
Ari D. Pasek
Quote:
Originally posted by mbeychok
Response to question by subzero*psia:
There is nothing new about the "hydrocarbon refrigerants" and they have been used in large industrial applications for many decades (e.g., in petroleum refineries, petrochemical plants, etc.).
The trade-named hydrocarbon refrigerants are:
-- Care 10 which is isobutane
-- Care 40 which is propane
-- Care 30 which is a blend of propane and isobutane
-- Care 50 which is a blend of ethane and propane
The R-numbered hydrocarbon refrigerants are:
-- R170 which is ethane
-- R290 which is propane (same as Care 40)
-- R600a which is isobutane (same as Care 10)
-- R600 which is normal butane
-- R601a which is isopentane
-- R601 which is normal pentane
If you go to the website of the Air Conditioning and Refrigeration Industry Board (ACRIB) located at http://www.acrib.org.uk, you can download (in the Acrobat PDF format) "Guidelines For The Use Of Hydrocarbon Refrigerants In Static Refrigeration And Air Conditioning Systems" ... which contains some of the physical properties of the various hydrocarbon refrigerants as well as other useful information regarding their use.
But since they are all very common and well-known hydrocarbons, you can find all the physical property and thermodynamic information you want in standard reference texts such as "Perry's Chemical Engineers' Handbook" and the "Handbook of Chemistry and Physics". They are both readily available in the library of any good university.
Keep in mind that the temperature versus vapor pressure curves of ethane, propane and isobutane are very different. Thus, when a refrigeration system is designed to use a specific blend of propane and isobutane (such as Core 30), then any change in the blend proportions will result in different system temperatures and/or pressures than were intended by the original design. The same is true for blends of ethane and propane (such as Core 50).
Milton Beychok
(Visit me at http://www.air-dispersion.com)
[Edited by WebMaster on 07-04-2001 at 02:11 AM]
Re: Hydrocarbon refrigerants
does anyone can help me?
rigth now i have a project n that was about hydrocarbon refrigerants analysis, n i need to know what various n characteristic from hydrocarbon it self? i mean what the best kind of hydrocarbon u can suggest for me, and what the effect if i used it the one of that various? because i'm new one with this specious, thanks
Re: Hydrocarbon refrigerants
Quote:
Originally Posted by
Elliza
does anyone can help me?
Of course, wow.
Quote:
Originally Posted by
Elliza
rigth now i have a project n that was about hydrocarbon refrigerants analysis, n i need to know what various n characteristic from hydrocarbon it self?
If the download section of this forum you will find refprop, which is a tool for calculation refrigerant properties. It's free and useful.
Quote:
Originally Posted by
Elliza
i mean what the best kind of hydrocarbon u can suggest for me, and what the effect if i used it the one of that various? because i'm new one with this specious, thanks
I analysed the curves of the widely available, and decided to go with R290 myself, but of course YMMV.
Re: Hydrocarbon refrigerants
Hi Elliza,
Welcome to the RE forums.
Let start with saying; refrigerants are refrigerants. Ammonia has different properties from propane, and CO2 is different than ethane.
The primary task with evaluating refrigerants is safety. Of course the hydrocarbons are flammable and have a risk of explosion if not designed properly. But these issues can be solved.
The next task is to use a refrigerant that has useful properties. At very low temperatures, ethane has a high vapor pressure so this may work for low temperature applications only.
Propane is good refrigerant for almost anything greater than -40C.
It all boils down to (sorry for the pun) the refrigerant properties at the operating conditions. Can you get a low required mass and volume flow for the required cooling capacity? Does the refrigerant exhibit pressures that are suitable for the intended operating conditions?
At least this is how I would approach the task of evaluating refrigerants.