wa8yxm
Wherever I happen to park
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Well. you could cool with Propane.. but you would need a deliver truck parked next to you for any real benefit.
Your fridge is what, 7 cubic feet..
My RV, closed is 8 foot by 7 foot by 35 feet (About) that's 280 times the volume of the fridge.. and that is BEFORE I PUT THE SLIDES OUT.
Nothin adds excitment like something that is none of your business
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ktmrfs
Portland, Oregon
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possible but not very efficent.
A "conventional" A/C unit is a heat pump that just moves heat from one place to another (inside to outside o vice versa) so it can be very efficient, just the losses in the pump and compressor. you can typically get 3-4 BTU or more of cooling for each BTU consumed. (No it doesn't violate the laws of physics)
My understanding from thermodynamics is that absorption refrigeration units aren't moving heat from inside to outside but providing the cooling from the absorption unit and hence consume more energy than the provide. So, they are way less efficient than a "heat pump" which a conventional A/C unit is.
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Learjet
Louisiana
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Well... my basic understanding of physics is that we start at absolute zero, and then we added heat. So, when looking at it in this manner there is no such thing as cold, just an absences of heat. If those statements are true, the absorption refrigerator still must remove heat to reduce the temperature.
What say you?
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Capt.Storm
Brockport NY.
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Learjet wrote:Well... my basic understanding of physics is that we start at absolute zero, and then we added heat. So, when looking at it in this manner there is no such thing as cold, just an absences of heat. If those statements are true, the absorption refrigerator still must remove heat to reduce the temperature. the absorption refrigerator still must remove heat to reduce the temperature.
What say you?
I always thought it was that way also..but I don't really "know",otherwise where does the coolness come from?
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Fishinghat
Western Washington, USA
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Learjet is correct. In physics, there is only heat; more heat and less heat. There is no such thing as "cold". You can't make "cold" with electricity or gas, (except by using some very exotic metals that none of us could afford).
That means an absorption refrigeration unit must move "heat" from one place and release it someplace else, just like a compressor system.
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smkettner
Southern California
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If you can figure out how to make cold rather than transfer heat you will be a billionaire.
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96Bounder30E
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Why not just power the compressor of the A/C unit with propane instead of electricity?......I don't think the OP meant to make the RV into a refrigerator
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MrWizard
Van Nuys, Ca
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how ? propane fueled engine to drive the compressor, instead of making electricity
then you would have (3) engines in the the RV, chassis, generator & A/C ?
propane is costly and inconvenient unless you have 500gal available
our Dp has a Propane fueled Onan and using JUST ONE a/c unit during the tripple digit temps, cost me over $20 per day in propane,
I refilled twice burning 57gal in 7 days $132
I went out and bought a 50amp to 30amp dog bone adapter and started using my champion portable to power the MH's electrical needs
* This post was
edited 07/23/10 11:32am by MrWizard *
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2oldman
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smkettner wrote:If you can figure out how to make cold rather than transfer heat you will be a billionaire. I want a 'macrowave' refrigerator. One that will slow down the movement of molecules, rather than exciting them like a microwave does.
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dclark1946
Richardson,TX,USA
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96Bounder30E wrote:Why not just power the compressor of the A/C unit with propane instead of electricity?......I don't think the OP meant to make the RV into a refrigerator
There is not that much difference in the physics between a gas and electrical refrigeration system. Both are heat pumps that move heat from inside to the outside through a heat exchanger operating at a higer temperature than the outside temperature using some type of gas and both require work put into the system to get the gas in the right state (temperature) to dump heat to the ouside temperature. An electrical A/C uses a compressor to provide the work input to the freon while a gas unit applies heat to the ammonia to provide work input. I am not sure how the efficiences compare but as others have commented there is no low energy solution to the A/C problem and you would consume a significant amount of propane running a large burner. The delta temperature maintained by an A/C system is generally only 20 degrees while a regrigerator must maintain about 40 to 45 degrees delta so while you can compare volume of the trailer directly to the volume of a trailer it is only half as bad as you might think if you don't take the emp difference into consideration.
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