Author Topic: Residential Fridges & solar  (Read 587 times)

Offline Froggy1936

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Re: Residential Fridges & solar
« Reply #25 on: August 03, 2019, 04:38 PM »
If the unit is running on propane the operating fire will not go out except when the control panel says no more refrigeration is needed ! So it will ignite the hydrogen ! if there is a leak . Frank
The Journey is the REWARD !

Offline Rickf1985

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Re: Residential Fridges & solar
« Reply #26 on: August 04, 2019, 10:10 AM »
This is kind of true. Hydrogen is much lighter than air so it will rise quite quickly out the top and the flame is on the bottom so unless the leak is at the bottom you will not have a fire but again, even if you do the hydrogen will burn off in seconds and as long as there is nothing loose in there for it to set on fire then that will be the end of it. The propane pilot will just keep burning and maybe the main burner but that is all inside the burner tube. Most RV's from about 1990 on up have auto shut downs on the propane for excess flow both on the tank and also electrically. They can be a real nightmare to reset.

Offline tmsnyder

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Re: Residential Fridges & solar
« Reply #27 on: August 05, 2019, 06:00 AM »
Ammonia is in the absorption fridges, not hydrogen I believe.

Offline Rickf1985

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Re: Residential Fridges & solar
« Reply #28 on: August 05, 2019, 09:20 AM »
The ammonia is the refrigerant and the hydrogen is the gas that isolates the system. I do not remember why it is that they used Hydrogen, they have moved to helium on newer units. I learned about absorption units waaaaay back when I was taking my refrigeration certs but we did not dwell on them since they were mostly used in the RV field and the far northern regions where there is no power grid. Neither of which pertained to us.


If you do a Google search for "Ford's refrigeration" you will find a lot of info on our refrigerators that debunks a lot of the myths that are spread out there.

Offline ClydesdaleKevin

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Re: Residential Fridges & solar
« Reply #29 on: August 05, 2019, 06:24 PM »
Ammonia is in the absorption fridges, not hydrogen I believe.

The ammonia is in liquid form, and then it is heated (either electrically or with flame) and it turns to gas and rises up in the coils.  When it mixes with the hydrogen gas, it causes a super cooling effect.  When it cools, it turns back to a liquid and drips back down in the reservoir at the bottom of the fridge.  I imagine it works the same way with helium, but have never heard of that before until Rick mentioned it.

Kev
Kev and Patti, the furry kids, our 98 Cherokee lifted beastie tow vehicle, and our 1995 Itasca Suncruiser Diesel Pusher.

Offline Froggy1936

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Re: Residential Fridges & solar
« Reply #30 on: August 06, 2019, 04:17 PM »
The first replacement cooling unit i bought , I paid an extra $100.00 for a non flammable gas , I don't know why they dont use such in all units . The units are so expensive now another $100.00 is not a big deal !  Compared to the fire danger !  Hm?
The Journey is the REWARD !

Offline khantroll

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Re: Residential Fridges & solar
« Reply #31 on: August 26, 2019, 07:23 AM »
One option is retrofitting an existing absorption fridge with a helium based cooling unit. There is at least one place here in Arkansas that does it, and that "amish" place carries retrofit units for many popular models. They cool better then the ammonia based ones.

Offline Rickf1985

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Re: Residential Fridges & solar
« Reply #32 on: August 26, 2019, 08:55 AM »
They all use ammonia as the refrigerant, the gas is the only difference.

Offline khantroll

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Re: Residential Fridges & solar
« Reply #33 on: August 30, 2019, 12:22 PM »
I stand corrected

Offline BamBam

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Re: Residential Fridges & solar
« Reply #34 on: August 31, 2019, 01:34 PM »
One option is retrofitting an existing absorption fridge with a helium based cooling unit. There is at least one place here in Arkansas that does it, and that "amish" place carries retrofit units for many popular models. They cool better then the ammonia based ones.



Which this has nothing to do with what this topic was originally intended to be about!

Offline Rickf1985

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Re: Residential Fridges & solar
« Reply #35 on: August 31, 2019, 02:44 PM »
So? I think everything that was going to be said has already been hashed out on that part of it. Does that mean we just completely stop posting on it/ Or do we continue to contribute bits and pieces. A lot of the information posted was inaccurate anyway. everyone reads it all and takes away from it what they want.

 

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