Pro/Forums - View Single Post

Enyin · 03-07-2003, 03:52 PM

Very interesting -- if you think about it, mapp would probably perform somewhere between pure R50 and the popular methane derivatives R12 and R22 - the mix of propane would help decrease the high pressure requirement that a pure methane system would need:

quoted from a basic refrigeration site:
----------------------------------------------------
R50(methane): this moderately light gas with a boiling point of -162C is the base compound for most of today’s refrigerants - in its pure form it is a bit too light(molecular weight 16) to work with outside of a cascade cooler. Though this can be used in a system of its own you will be needing pressures nearing the 450 mark on a warm day to liquefy. So overall a great additive or for use in a cascade cooler.

Unfortunately it seems that Mapp is trademarked and I can't find any detail about it's chemical properties or makeup (ie what if it's 99% propane and 1% methane)

In a non cascade system I think you'd need a hardcore compressor for mapp - again it all depends on the % makeup of propane to methane to other gasses in it. Hell it sure would be a fun experiment though

Any students out there that have access to a spectrum analyzer of some sort that could take apart Mapp gas for us?

Hehe, on this same thought how bout HELIUM as a refrigerant, also very readily available!! Boils at -268.6 °C OMG rar
Get a very strong compressor, a very small metering device, some titanium tubing and design a custom oil injection system to feed the compressor and you're in business....booya!

03-07-2003, 03:52 PM	#2
Enyin Cooling Neophyte Join Date: Feb 2003 Location: NJ, USA Posts: 22	hmmm Very interesting -- if you think about it, mapp would probably perform somewhere between pure R50 and the popular methane derivatives R12 and R22 - the mix of propane would help decrease the high pressure requirement that a pure methane system would need: quoted from a basic refrigeration site: ---------------------------------------------------- R50(methane): this moderately light gas with a boiling point of -162C is the base compound for most of today’s refrigerants - in its pure form it is a bit too light(molecular weight 16) to work with outside of a cascade cooler. Though this can be used in a system of its own you will be needing pressures nearing the 450 mark on a warm day to liquefy. So overall a great additive or for use in a cascade cooler. Unfortunately it seems that Mapp is trademarked and I can't find any detail about it's chemical properties or makeup (ie what if it's 99% propane and 1% methane) In a non cascade system I think you'd need a hardcore compressor for mapp - again it all depends on the % makeup of propane to methane to other gasses in it. Hell it sure would be a fun experiment though Any students out there that have access to a spectrum analyzer of some sort that could take apart Mapp gas for us? Hehe, on this same thought how bout HELIUM as a refrigerant, also very readily available!! Boils at -268.6 °C OMG rar Get a very strong compressor, a very small metering device, some titanium tubing and design a custom oil injection system to feed the compressor and you're in business....booya!