Thinking of making on of these

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Stu
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Thinking of making on of these

Post by Stu » Sun Dec 21, 2014 8:55 am

http://roadshower.com/woo/product/road-shower/

As I see it, I'd need a 12v compressor, a pressure release valve, and a thermostatic heating element. (Not going to rely on solar)

What do you guys think? Straightforward? Any ideas on where to get any of the components required?


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Re: Thinking of making on of these

Post by JF Lux » Sun Dec 21, 2014 9:30 am

I was thinking about something like that as well once - but concerned about weight transfer when partially empty. I don't think it would need a lot of water sloshing around up top to have a balance problem, especially when its on the roof and way above center of gravity ?


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Re: Thinking of making on of these

Post by Kingmav66 » Sun Dec 21, 2014 9:43 am

We did something similar(ish) on my brothers Landcruiser years ago. Except the water tank was internal and we fitted a heat-exchanger under the bonnet plumbed in to the engine cooling system. It worked well, and you weren't storing water at the perfect temp for bacteria growth :thumbright:



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Re: Thinking of making on of these

Post by anglefire » Sun Dec 21, 2014 9:59 am

The other problem is going to be power.

MCdeltaT is the basic formula to work out the kW required - where M is mass, C is the specific heat capacity of water and deltaT is the difference in themperature.

C for water is about 4.2kJ/kG/'C

So, if your shower is running at 0.25l/s and you want it to run for 2minutes that is 30l of water. And you'll therefore need about 21kW of power to heat the water (from 10 to 30'C - which is hardly a hot shower) . At 12V, a 1kW element is 83A - which you'll have to have going all day, pretty much for your one shower.


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Re: Thinking of making on of these

Post by JF Lux » Sun Dec 21, 2014 10:11 am

Now you put it in those terms Mark - its no wonder I pay so much in heating...cold showers for the kids from now on :lol:


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Re: Thinking of making on of these

Post by anglefire » Sun Dec 21, 2014 10:55 am

I thought you foreign types all had cold showers and lashed yourselves with birch twiggs?




Or is that just the Swedes? :whistle:


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Re: Thinking of making on of these

Post by anglefire » Sun Dec 21, 2014 10:59 am

Oh and why the compressor? If its for powering the water to give more pressure, then the water volume will go up as will the power requirements.


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Re: Thinking of making on of these

Post by Beanie » Sun Dec 21, 2014 11:35 am

Gas powered eccotemp L5 :thumbright:


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Re: Thinking of making on of these

Post by Stu » Sun Dec 21, 2014 12:23 pm

I couldn't decide on a compressor to use air pressure for power or a water pump.

I think .25l a second is quite a lot?!


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Re: Thinking of making on of these

Post by anglefire » Sun Dec 21, 2014 1:23 pm

I could be - but then a deltaT of 20'C is not a lot either - a shower at 35'C is probably nearer what you'd want and the water temperature cold, is probably less than 10'C.

But you can work out the power easily enough - but whatever it is, it is a lot to suck out of the car if purely electric - the better way would be gas as the energy density is higher. Or Solar - which would be fine down south. :shark:


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