#dev-diary solar still
I've got a very #solarpunk project. make a solar still.
My goal, is to provide clean drinking water on my boat when it's not raining.
currently, I need to find a tap somewhere, or wait until it rains.
Waiting until it rains is actually pretty viable except in the height of summer.
Finding a tap isn't too hard but it makes me dependent on land which I do not like.
The $$ method is get a water maker. This is a device that pressurizes salt water so that it squeezes through a ceramic membrane which blocks the salt, creating drinkable water. But these devices are
- power hungry
- high maintainance
All of which I am against. I don't want to be depending on something that can break easily, not for drinking water. I'd rather rely on rain water, even if I have to wait for the rain, it's empowering because I just arrange a simple tent and capture free water falling from the sky. I just have to monitor the weather and water usage. But this creates a closer relationship with nature.
A solar still could do that, but with sunshine instead of rain.
The basic idea with a solar still is you put bad water in the bottom, the sun heats and it evaporates, then it condenses on something and runs down into a catchment, providing drinking water.
you might be aware of the solar still as a survival technique, dig a hole, plastic sheet over it, and a stone in the middle, so that water condensing on the plastic drips down into the center were a container collects it.
both of these produce water sufficient for survival. I'd like to make enough water that at least some people might envy my lifestyle.
then there are a variety of solarstill designs presented on youtube, from backyard constructions, to hipster stills for 3rd world drinking water, to engineers researching how to make stills more "efficient".
this one is quite amusing:
the engineers seeking efficiency seem to be defining efficiency it as more water per space, but make bulky designs that have more advanced components
for example: https://www.youtube.com/watch?v=6MynEdS5WH8
advanced components means more cost, and seems to produce a bulky, 3d design.
One of my favorites is this Australian one, http://www.fcubed.com.au/aspx/home.aspx that looks like solar panels
This one has a circulating water supply that runs through a wick instead of a reservoir. The wick stays wet, but doesn't have much bulk, some water passes through, which also has the benefit of avoiding sludge that then needs cleaning.
I want something like that but using the cheap materials like this one:
Also I plan to use this on a boat, so it needs to be easily setup/taken down.
I expect it to be used while at anchor, which is most of the time, probably not while sailing.
Also, there are a variety of claims as per amounts of water produced, but often this it does not give me the impression that they actually used it, so I'm not sure if I believe many of these claims. My goal is to get at least 5 litres a day. If it's more than that, then that will be fairly comfortable living for two people, and when it rains you'd get a lot more.