I have made a set of PFC's for a DIY'er They Will Be Installed Reversing The Gases

[Rawknees'Turbo]

Originally Posted by KelogGes

its unfortunate I have decided to not post the install here, you had your chance
oh well!

I wonder how we'll all be able to cope - perhaps drugs (more) will be necessary?!?!

[KelogGes]

Originally Posted by DaveMcKenz

Hi Reid,
I did include the reversed gas flow, by saying you send to front condenser first, then rear condenser. That's the only reversal isn't it?
Thanks,
Dave

Dave

you're doing just fine

the reversed gas flow

"The smaller front PFC IS now doing the Premiere first act stage of highest heat temp condensation, rear second act or stage PFC is just idling along NOW and helping!"

If my front PFC were only a little more efficient there would be no need for the rear PFC AT ALL

I have an idea i have been sitting on for over for 3 years; prototype for a more state of the art front ONLY CONDENSER early model 911 PF (different) MICRO-CHANNEL; but I am to busy right now to test it LOL

These fools making all the BS Noise in here shot themselves in the foot

Dave you like technology go read about co2 refrigerants and A/C co2 compressors the auto industry is currently installing in cars

[tirwin]

Selling. Not selling.

Going to explain the new idea. Not going to explain the new idea.

Rerouting. Reversing.

There is more. There is nothing more.

There is a customer and he isn't allowed to share anything.

This whole thing is an enigma shrouded in mystery.

If anyone does page the admins maybe they will delete the nearly 2 dozen pages that don't tell us any more than when this thing started.

My synopsis.

[DaveMcKenz]

Originally Posted by KelogGes

Dave

you're doing just fine

the reversed gas flow

"The smaller front PFC IS now doing the Premiere first act stage of highest heat temp condensation, rear second act or stage PFC is just idling along NOW and helping!"

If my front PFC were only a little more efficient there would be no need for the rear PFC AT ALL

I have an idea i have been sitting on for over for 3 years; prototype for a more state of the art front ONLY CONDENSER early model 911 PF (different) MICRO-CHANNEL; but I am to busy right now to test it LOL

These fools making all the BS Noise in here shot themselves in the foot

Dave you like technology go read about co2 refrigerants and A/C co2 compressors the auto industry is currently installing in cars

Eliminating the rear condenser should be possible, since Porsche did it on all 964 and after 911 derivatives. The 993 condenser, for example, is quite compact, has clever ducting and a big, high power fan. No rear condenser needed. The early 911's have space problems, but may be solvable. Great idea.
Good luck,
Dave

[Bob Kontak]

Originally Posted by tirwin

Post #403.

Why are you losing traction?

[lateapex911]

Not sure why Mods should be called in? It's an interesting thread, and I've learned a lot about AC so far, and had many chuckles.

[dentist90]

All these AC mods are laughable. 34F vents temps? Whut-evar. My AC goes to 11!

[KelogGes]

Originally Posted by DaveMcKenz

Eliminating the rear condenser should be possible, since Porsche did it on all 964 and after 911 derivatives. The 993 condenser, for example, is quite compact, has clever ducting and a big, high power fan. No rear condenser needed. The early 911's have space problems, but may be solvable. Great idea.
Good luck,
Dave

Porsche 964 A/C IS a slightly different animal early model 911 and has its own A/C issues to make ice cold


964-993 AC Condensers OLD OBSOLETE TECHNOLOGY
964-573-011-03
993-573-011-00
993-573-011-01
993-573-011-10

I have designed PFCs for this model also but have not made them yet

I want to come out with PFCs for the 930s next

I think my rear 930 PFC design will adapt nicely for the 964 & 993

[KelogGes]

April Was Hottest Month Ever... Record Smashed AGAIN... 'Greater Than 99 Percent Chance' 2016 Will Be Warmest Year In History...

[Rawknees'Turbo]

^^^

No doubt that high levels of methane produced by reversing the gasses has contributed greatly to global warming.

Originally Posted by dentist90

All these AC mods are laughable. 34F vents temps? Whut-evar. My AC goes to 11!

Are your sure that's ice?!?!

[KelogGes]

I Am SURE YOU LIE!

[Rawknees'Turbo]

[Bob Kontak]

Jeebus, Rawknees..........

Per WIKI

Publishers point to "many longtime Almanac followers claim that our forecasts are 80% to 85% accurate" on their website.[1] Professional meteorologists refute this pointing to historical results of below 50 percent accuracy rate.

Get out and drive ten minutes and check vent temps. They will not be 27.

Butt-of-course. (RIP to our dear departed friend).

[Rawknees'Turbo]

Originally Posted by Bob Kontak

J

Get out and drive ten minutes and check vent temps. They will not be 27.

Butt-of-course. (RIP to our dear departed friend).

Bobasaurous, correct; on a mid-upper 90s day, the average temps will only be in the 29-30 degree range! After all, the limitations of my obsolete a/c componentry are well known, so please keep your expectations realistic!

[lucifer572]

It's been a while since everyone has seen this annoying thread. Thought I'd bring it back for Memorial Day to remember those we've lost, and those who were sadly taken from us too early when removed from the forums during the "reverse the flow" war.

[Ngrich99]

I think I might be on to something!


I asked my grandma to test this. ( disinterested third party). I had her take the top off our shop vac and put the hose in the different hole. Now it blows instead of sucks. And according to this found on the Internet .. "Air is a mixture of gases, 78% nitrogen and 21% oxygen with traces of water vapor, carbon dioxide, argon, and various other components. We usually model air as a uniform (no variation or fluctuation) gas with properties that are averaged from all the individual components.
Grandma is reversing the gases to blow her driveway! That doesn't suck!

[Rawknees'Turbo]

^^^

Bob K. sez yer Grandma's a hottie!

And as a bonus, I bet she's way more pleasant to converse with than Reid/Kellogs!

[KelogGes]

Basic Refrigeration Cycle: Apply to all A/C & Refrigeration Systems

Very Easy To Understand FOR DIY; detailed system knowledge

[KelogGes]

Reid Kelly 954-599 5235 ICECOLD911

[KelogGes]

The Professor: Symptoms of Air in a Refrigeration System | 2015-06-01 | ACHRNEWS

The Professor: Symptoms of Air in a Refrigeration System
Air May Cause a Reduction in Condensing Surface Area and High Head Pressures
FS-table.jpg
June 1, 2015
John Tomczyk
KEYWORDS Air in a Refrigeration System / condenser / John Tomczyk / refrigeration / The Professor
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Symptoms of Air in a Refrigeration SystemAir doesn’t belong in a refrigeration system, and if it gets in, it will cause problems. Air can enter a refrigeration system in many ways, including through tube, gasket, or flange leaks; poor charging procedures; poor recovery or recycling procedures; or by forgetting to purge hoses when accessing systems.

If air gets into a system, it will collect in the top of the condenser and be trapped. Air is a non-condensable and cannot be condensed like refrigerant vapors. The liquid seal (subcooled liquid) at the bottom of the condenser will prevent air from leaving the condenser. Air will cause a reduction of condensing surface area and cause high condensing (head) pressures.

Air can enter the system through a leak in the low side of the refrigeration system. Refrigerant leaks will eventually lead to an undercharged system. Severely undercharged systems will run vacuums in the low side. These vacuums will suck in air from the atmosphere because the system’s low-side pressure is lower than the atmospheric pressure.
Know the Symptoms

The symptoms of air in a refrigeration system are:

• High discharge temperature;

• High condensing (head) pressure;

• High condenser subcooling;

• High condenser split;

• High compression ratios;

• Normal to slightly higher evaporator (suction) pressures;

• Normal superheats; and

• High amp (Horse power) draws.

Let’s take a closer look at each of these.

High Discharge Temperatures — These are caused by high compression ratios. High heats of compression are associated with high compression ratios. High compression ratios are associated with high condensing (head) pressure. The compressor has to compress suction vapors through a greater pressure range; thus, more heat is generated.

High Condensing (Head) Pressures — High head or condensing pressures are generated from the air taking up condensing surface volume at the top of the condenser. Because the air stays at the top of the condenser and doesn’t condense, it leaves a smaller condenser to desuperheat, condense, and subcool the refrigerant.

High Condenser Subcooling — The elevated condensing temperatures and pressures make the subcooled liquid in the bottom of the condenser hotter. Now there is more of a temperature difference between the subcooled liquid and the ambient to where heat is rejected. This will increase the rate of heat transfer from the subcooled liquid because the temperature difference is the driving potential for the heat transfer to take place.

The higher subcooling does not necessarily mean there is more liquid at the condenser’s bottom, it just means there is more cooling of the same amount of liquid to make the temperature difference greater. Remember, condenser subcooling is a temperature difference between the liquid temperature at the condenser outlet and the condensing temperature.

High Condenser Splits — Because the air is sitting at the top of the condenser, causing elevated condensing pressures and temperatures, the temperature difference between the surrounding ambient and the condensing temperature will be high. This temperature is defined as the condenser split.

High Compression Ratios — The higher condensing (head) pressures will cause the compression ratio to increase, causing low volumetric efficiencies and loss
of capacity.

Normal to Slightly Higher Evaporator (Suction) Pressures — A system’s thermostatic expansion valve (TXV) will control superheat as long as the pressure ranges of the valve are not exceeded. It takes a very high head pressure to exceed the pressure range of most TXVs. The TXV may overfeed a bit on its opening strokes because of the greater pressure difference across its orifice, giving it a slightly higher capacity. This may give the evaporator a suction pressure that’s a bit higher than normal.

If the amount of air in the condenser is extreme, the compression ratio will skyrocket and cause very low volumetric efficiencies. This will cause a low capacity, and the box (your 911 cabin) temperature may rise. This added heat in the box (your 911 cabin) may cause evaporator pressure to increase because of the added heat load.

Normal Superheats — As mentioned earlier, the TXV will try to maintain evaporator superheat as long as the valve’s pressure range is not exceeded. The opening strokes of TXV may momentarily overfeed the evaporator, but it will start to gain control shortly afterwards.

High Amp (Horse power) Draws — The high compression ratio will cause a greater pressure range for the suction vapors to be compressed. This will require more work from the compressor and increase the amp draw.

Publication date: 6/1/2015