There are no detailed instructions are available that I know of. Amazing what elderly people suggest, and one mentioned was that when he was younger he had a Coolgardie safe. However, this was all without the drip tray beneath the safe. What he was observing was the basic principle of heat transfer that occurs during the process of evaporation: that as it transforms from a liquid to gaseous state, water consumes energy in the form of heat, taken from its surroundings. Initially the strips of flannel I used were only half the width of each hessian panel. I can only imagine how clothes were washed!Hey mate, i use an evaporative cooler at work. Often a terracotta brick is used to add thermal mass and to keep the cooled products out of the water. Meanwhile, I hear you asking, ‘What is the Coolgardie safe?’ The short answer is ‘a meat safe’ — but there’s more to it than the Coolgardie safe being a ventilated, vermin-proof box in which to store perishable food.The Coolgardie safe was invented in the 1890s on the goldfields of Coolgardie, Western Australia, by Arthur McCormick. (Ideally you would find an economic balance between enough wicking to make the safe functional, while preventing too speedy a loss of water from the reservoir. Following the repair of the faulty item a megger would be used to check if either of the AC 240volt … It was an Australian invention used especially in country areas from the 1890s until the mid 20th century.

perhaps the slope steadied the water flow.Thanks Brian! It was my good fortune that the Eldorado Museum Association agreed to let me borrow this safe for a living history trial.Manufacturing plate on the Coolgardie safe at the Eldorado Museum.This particular Coolgardie safe is of a common type: a rectangular metal frame, which supports hessian sides, wired on. )I put the safe under my back verandah and filled the reservoir to the very top, which really kicked-off the wicking process: water could be seen wicking from the flannel down and across the hessian panels in a matter of seconds. I’m greatful for the information that you provided. Strips of flannel are hung from the tray to contact with the hessian sides, which keeps them damp through a process of capillary siphoning (wicking). I reckon I’ve seen some that are slightly more like four-sized pyramids. How does the Coolgardie Safe Work? Here’s a suggestion… since the system works on evaporative cooling, I would try to increase the breeze going over the unit by setting up solar powered fans. a difference was the sides were slightly slopping. When a breeze comes, it passes through the wet hessian and evaporates the water. As the bag soaks up the water, wind blows through it and evaporates the water. I’d read many descriptions and testimonials regarding the Coolgardie safe, but I still wondered if it worked, and if so — how well?I knew that the Eldorado Museum had one in its collection [2], which, until recently, had languished ‘out the back’ until local Howard Phillips gave it a fresh jacket of hessian so that it could go on display. The drip-tray that came with the safe was rusted-through, so I hadn’t used it; but now I was beginning to wonder whether the tray may have also provided some micro-climatic benefits.This question is something I’ve decided to pursue on the ‘morrow. The top of the frame has a galvanised sheet-metal tray (ie: a reservoir), which is filled with water. I guess I’ll just have to experiment with that one. we did have an ice box that was so small it was next to useless.What a great story. (Photo swiped a long time ago from a seller on eBay! There is also a central vent in the bottom of the safe which vents through a little chimney passing through the middle of the reservoir at the top — and I’ve seen other Coolgardies with this feature.Another Coolgardie safe complete with a lid over the water reservoir. The results speak for themselves:At 3.15pm it was 39.1ºC degrees in the sun, 36.9ºC under the verandah, and immediately 31.4ºC in the Coolgardie. As I write this, I’m about the pull a beer, chilled to 4ºC, from my fridge.I didn’t get started until later in the day, and it was a scorcher, topping a bit over 39ºC!

Difference of 6 deg C up to 8/9 deg C. I’m wondering if the volume of the box makes a difference? It has a simple hinged door on the front, and one internal shelf. This cools the air inside the safe, and in turn, cools the food stored inside. McCormick had observed that a wet bag placed over a bottle cooled its contents, and that if this bottle was placed in a breeze, the bag would dry out more quickly, but the bottle would get colder. It did cool but our Mallee summers are a bit to much for the system.I use a mini coolgadi safe i made in my camper van i kept butter that is still firm enough to hold on a knife and have kept raw meat during the hottes part of the day i have traveld around Australia using itI live off grid and have been trying to find a way to keep food cool without refrigeration for a long time.

Where can I get detailed instructions and good pictures to build this for me?Hi Oliver. Good luck with your experimentation, and please let me know if you make any advances. Thus my interest. This particular device produces 250volts DC when the handle is turned vigorously. McCormick had observed that a wet bag placed over a bottle cooled its contents, and that if this bottle was placed in a breeze, the bag would dry out more quickly, but the bottle would get colder. The Way the Coolgardie Safe works is based on the state change of liquid to gas, or evaporation.At the top of the Coolgardie safe there was an iron tray full of water.

This time I put the drip tray under the Coolgardie safe, and filled both it and the reservoir at the top.

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