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  Topic Review (Newest First)
26-06-2016 18:06
gaspode
Quote:
Originally Posted by nicholsong View Post
Come in Gaspode please. I bet he knows the answer.

Geoff
Such blind faith in my technical expertise is entirely unjustified Geoff.

Undoubtedly it's quite possible to build an air cooling unit powered by LPG, it would presumably be an absorption unit similar to a gas fridge with no door and a circulation fan. You could always leave the freezer door open and put a fan inside to blow the cool air around?
I think there are systems in use that utilise the latent heat of evaporation of LPG but to make this practical you would need to be using the LPG to power some other large device such as a large IC engine or heating system.
To the best of my knowledge there are no systems suitable for M/H use made commercially and I'm unaware of the reason why. I would assume that any such unit would be large, expensive and complex if powerful enough to provide sufficient cooling for even a small living space. It would probably also use a substantial amount of LPG and be less efficient than a comparable electrically operated system.
Maybe an unexploited business opportunity for an entrepreneur but I doubt there would be much of a pay-back for any developer considering the high development costs and relatively small potential market.
26-06-2016 13:45
aldra I follow your thought process I think

I imagine air con could be powered by gas

But if so why hasn't it been done, or maybe it has

Sandra
26-06-2016 13:10
Suenliam Many thanks everyone for your input...perhaps a re-think?

No need to apologise Geoff for hi jacking the thread. As a totally non-technical person your logic seems fine to me. After all, vacuum cleaners can blow as well as suck and even some air-con machines can heat as well as cool. The Truma water/space heaters have been developed to run on the electric so perhaps this is the next stage?

Sue
26-06-2016 12:49
nicholsong Apologies to Sue(OP) if this is slightly buting in on her thread.

Since LPG can power a refrigerator are there any Aircon units, fixed or portable powered by LPG? I ask because we ae never on EHU.

Sandra said they use their gas generator, but that is a electric generator fuelled by gas, which seems a complicated way if there were a direct gas-powered refrigeration unit available. Of course it would need an electric fan, but that is like a hot-air heating system, so no change there.

That leads me on to thinking that the Truma heating system could be adapted if there were the ability to switch from heating to cooling. Slight drawback is that heat vents are located low, which is not best position for cool air. Maybe if there were a re-circulation option, like car aircon, the system could cope in the confined space of a MH.

Am I barking up the wrong tree, or maybe just 'barking'?

If it is a non-starter just tell me.

Come in Gaspode please. I bet he knows the answer.

Geoff
25-06-2016 22:17
aldra I tend to agree

We have the dometic freshlite

It has a multitude of functions

But for me and the hound from hell

It keeps us cool

Off grid our gas generator runs it if necessary

But if it's hot we head for a campsite

The hound and me struggle if temps rise

Sandra
25-06-2016 22:08
deefordog Doing away with the roof a/c won't really save any weight if replacing with a freestanding unit - taking the latest Dometic 2600 Freshjet (8500btu, 39kg), our Electrolux 9000btu came in at 35kg. As the others have said, stick with what you've got if it does the job.
25-06-2016 18:44
Pudsey_Bear
Quote:
Originally Posted by Mrplodd View Post
Having had a roof mounted Aircon unit in the past thee is no way I would ditch it in favour of a mobile or floor mounted one.

The roof mounted unit doesn't take up any floor space so you don't need to keep moving it about, it doesn't compromise the security of your MH, it's a fi(ted) and forget item, they tend to be much better at cooling the interior

The downside is that they can be noisey and they do draw a lot of power so unless you have a very hefty inverter (and large Leisure battery bank) then it cannot realistically be used whilst under way.

If it ain't broke don't fix it???

Andy
Roof mounted as better anyway as cold air descends making it more efficient.
25-06-2016 17:59
Mrplodd Having had a roof mounted Aircon unit in the past thee is no way I would ditch it in favour of a mobile or floor mounted one.

The roof mounted unit doesn't take up any floor space so you don't need to keep moving it about, it doesn't compromise the security of your MH, it's a fi(ted) and forget item, they tend to be much better at cooling the interior

The downside is that they can be noisey and they do draw a lot of power so unless you have a very hefty inverter (and large Leisure battery bank) then it cannot realistically be used whilst under way.

If it ain't broke don't fix it???

Andy
25-06-2016 16:06
deefordog We used one of these when we had our twin axle caravan, so about the same floor space and cubic m as your average MH. http://www.appliancesdirect.co.uk/p/exp09hn1wi/electrolux-exp09hn1wi-air-conditioner
It worked very well at keeping the dog cool when we had a very hot spell in the UK in 2013. A few things to note though:

You'll need to vent the exhaust through an open window. The end of the 4" exhaust hose terminated in a rectangular piece which goes through the open window but means the window has to be open quite a way. Then you have to contend with or block the "open" section next to the outlet so hot air doesn't come back in. Security is also then compromised as you may want to run the a/c when out and about but the window will be open!

Most portable a/c units only direct the cooled air in one direction so you can experience overcooled parts of the hab area whilst still having warm areas.

Although the one we had was 9000btu, it didn't feel that good at cooling unless it was run flat out and then it became very noisy in the 'van. Certainly not as quiet as a roof mounted unit. Found it impossible to sleep at night with the a/c on, again due to the noise.

You need to locate the main unit as close to a window as possible to minimise the length of exhaust hose. According to Electrolux, extending the hose can reduce the efficiency of the unit and I'd concur with this, having tried to tidy up the exhaust hose and routing it outside the 'van with extra ducting.

Ours was a big 'van but the a/c unit still got in our way. It was on wheels so we could move it around when not in use. Good job as it was bloody heavy.

It worked well (apart from the noise) if we kept the blinds closed before any sun got into the 'van or the 'van started to heat up. This meant we spent most of the day in the dark when in the 'van lol.

If floor space and weight aren't an issue, then a free standing a/c unit might suit you. We "lost" ours in a dispute with the owner of a seasonal site in 2014 but that's another story lol. Suffice to say we haven't replaced it after using it just once in our Kontiki tag and are now erring towards a roof unit. More money but many more benefits, space being one of them.
25-06-2016 15:46
Pudsey_Bear We used to have one of these (different model) they work quite well, ours was a 100watt version so would run from a good inverter and a decent sized battery bank, you can get smaller ones they all work in more or less the same way.
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