Thinking of making on of these
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Thinking of making on of these
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?
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
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
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
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Re: Thinking of making on of these
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.
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
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
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Re: Thinking of making on of these
I thought you foreign types all had cold showers and lashed yourselves with birch twiggs?
Or is that just the Swedes?
Or is that just the Swedes?
Mark
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Re: Thinking of making on of these
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.
Mark
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Re: Thinking of making on of these
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?!
I think .25l a second is quite a lot?!
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Re: Thinking of making on of these
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.
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.
Mark
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