Otis Singleton
Keeping food refrigerated without electricity is a challenge, especially in humid climates. However, there are various methods to achieve this, some of which have been used for centuries. The most common techniques include using Zeer pots, root cellars, charcoal coolers, and iceboxes. Zeer pots, also known as pot coolers, have been used since ancient times and rely on evaporative cooling to keep food fresh. Similarly, charcoal coolers use the evaporative properties of charcoal to maintain a cool interior temperature. Root cellars, on the other hand, are man-made caves that provide a natural cool environment for food storage, especially for root vegetables. Lastly, iceboxes were commonly used in the 1940s and 1950s, requiring a supply of ice to keep food chilled. Other methods include using running water, fabric wraps, and spring houses to maintain cool temperatures for food storage.
| Characteristics | Values |
|---|---|
| Zeer Pots/Pot Coolers | Ancient Egyptian cooling devices that use evaporative cooling to keep food cool without electricity |
| Root Cellars | Underground structures used to store root vegetables, canned goods, fruits, and nuts |
| Charcoal or Coal Coolers | Timber frames filled with moist charcoal that cools air through evaporation |
| Iceboxes | Similar to modern coolers, iceboxes require a source of ice to maintain proper temperatures |
| Storing Food in Sand | Extends the shelf life of root vegetables by maintaining optimal moisture, air, and humidity levels |
| Storing Food in Running Water | Used by campers and backpackers to keep food cool, but requires protection from aquatic animals |
| Storing Food in Fabric | Wrapping food in wet fabric and placing it in a cool, shady place can keep food cool for a short period |
| Living in a Cold Climate | Food can be kept cold without electricity if you live in a cold climate |
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What You'll Learn
Use a Zeer pot or evaporative cooler
Zeer pots, also known as pot coolers, are ancient cooling devices that date back to 2500 B.C. in Egypt. They are still used today in rural Africa and the Middle East. Zeer pots are constructed by placing a small clay or terracotta pot inside a larger one, with the gap between them filled with wet sand. The sand is then covered with a wet cloth. As the water in the sand evaporates, it draws heat outward, lowering the temperature inside the pots. This technique is called evaporative cooling.
To get the best performance out of a Zeer pot, it should be placed in a dry, shady, and well-ventilated space. A constant breeze will help to cool the pot, and a fan powered by a solar panel can also be used to increase airflow. Zeer pots work best in low-humidity climates (less than 40% relative humidity) and when the temperature is relatively high (a maximum daily temperature higher than 25°C). They require a constant supply of water, which can be a consideration in drought-prone areas.
Zeer pots are effective at keeping vegetables fresh for up to a couple of weeks. They are particularly beneficial for storing vegetables that are vulnerable to spoilage due to exposure to high temperatures and low humidity, such as eggplants, tomatoes, leafy greens, peppers, and okra. However, they are not suitable for items that require sustained temperatures below 20°C, such as medicine, meat, and dairy products, or foods that need a low-humidity environment, such as onions, coffee, garlic, millet, and grains.
While a Zeer pot will not get as cold as a refrigerator, it can still keep food cool and fresh. This makes it a useful option for preserving food without electricity, especially in hot and dry climates.
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Store root vegetables in sand
Storing root vegetables in sand is an effective way to extend their shelf life without refrigeration. Root vegetables such as potatoes, carrots, turnips, radishes, beetroot, parsnips, and onions can be stored in sand for up to six months. The sand helps regulate humidity and maintain optimal moisture and air levels, preventing premature ripening and rotting.
To store root vegetables in sand, start by selecting a suitable location. A cool basement, pantry, cellar, shed, or unheated garage are ideal choices, as long as the temperature does not drop below freezing. The storage area should be unheated, enclosed, and well-insulated.
Next, choose the right type of sand. "Play" sand, a fine-grade sand used in children's sandboxes, is recommended. This sand has been washed, dried, and screened. It is typically available in 50-lb bags at local garden and home improvement stores. The sand should be slightly damp, but not soggy. If it is too dry, moisten it with a spray bottle of distilled water before packing the root vegetables.
Prepare the root vegetables by removing any leafy tops, carrot fronds, or beet tops. Do not wash the vegetables before storage as this can accelerate decomposition. Instead, brush off any dirt and let them sit in the air for a day or two to allow the skins to cure and dry. Select mature, unbruised, and unblemished vegetables for storage.
Now, you can begin layering the vegetables and sand. Pour a layer of sand several inches deep into your storage container. Cardboard or wood boxes placed off the ground on pallets are ideal. You can also use the crisper drawer in your refrigerator or plastic storage bins. Work the vegetables into the sand, adding more sand and vegetables in layers, ensuring the sand covers each layer of vegetables. Leave some space between the vegetables and avoid letting them touch each other. Store vertically growing root vegetables, such as carrots and parsnips, in an upright position.
Regularly check your stored vegetables every week or so, removing any that show signs of deterioration. Root vegetables stored in sand can remain fresh for two to five months. Remember to dust off and clean the vegetables thoroughly before preparing them for consumption.
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Try a charcoal or coal cooler
A charcoal or coal cooler is a great way to keep food refrigerated without electricity. This device is based on the principle of evaporative cooling, which has been used for food preservation since 2500 B.C. in Egypt. The Zeer Pot, for example, is an ancient evaporative cooling device.
The charcoal cooler is constructed from a timber frame with charcoal on the sides. The charcoal is kept moist, and as warm, dry air passes through, the moisture evaporates, drawing heat outward and producing a cooling effect. The more wind flows through the device, the lower the temperature goes. This type of cooler should be placed in a shaded area but with free-flowing wind.
Charcoal coolers can be constructed from locally available materials, such as timber, wire mesh, charcoal, dry grass, or papyrus reeds. They come in various sizes and can be built by local artisans.
A study by the University of Nairobi, Kenya, found that charcoal coolers could extend the shelf life of camel milk by at least one day. This demonstrates the effectiveness of charcoal coolers in preserving perishable commodities without electricity.
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Use an icebox
Iceboxes were commonly used in the 1940s and 1950s, right before the invention of the refrigerator. They were kept in the kitchen and used to keep food cool. To use an icebox, you need to have ice. This was typically harvested from lakes in the wintertime and stored in a well-insulated area until the warmer weather. The best ice houses are underground, using straw and sawdust for insulation.
While it would be challenging, you could build an ice house and harvest ice in the winter for use when the weather is warmer. Alternatively, you can purchase ice from a warehouse or "ice house".
Insulated coolers with ice or dry ice offer an effective cooling solution for a short period. This method is convenient for temporary situations or emergencies when access to electricity is limited. However, it requires external resources and is not self-sufficient.
Another option is to create a makeshift evaporative refrigerator by wrapping fabric around a shelving unit and wetting it down. Food placed on the shelves will stay cool as the water evaporates. This method works best in a dry climate and when the fabric-wrapped food is placed in a shady, cool area.
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Build a root cellar
Root cellars are an effective way to keep food cool without electricity. They are natural cold storage options, utilising cool, moist underground conditions to preserve food. They can be built into basements or porches, buried underground, or built above ground.
If you are building a traditional root cellar underground, you must ensure the water table is not too high and that the soil is deep enough. They are also less effective in warmer climates, as the ground temperature is higher.
The easiest way to build a root cellar is to section off part of your basement. Select an area with a window for ventilation and natural light, and fill the window with exterior-grade plywood, cutting vent holes. Ensure you insulate between the house and the root cellar, so the space does not heat from above, and you do not lose house heat. Use materials that can tolerate moisture exposure and avoid treated wood, opting for naturally rot-resistant wood instead.
If you do not have a basement, you can build a root cellar outside your home. You can even build a mini root cellar in your backyard in less than two hours. All you need is a shovel, a trash can, and a little elbow grease.
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Frequently asked questions
Zeer pots, coal or charcoal coolers, and root cellars are all ways to keep food cool without electricity.
Zeer pots, also known as pot coolers, are ancient Egyptian cooling devices that use evaporative cooling to keep food fresh. They are made up of two clay pots, one nested inside the other, with the gap between them filled with sand and water. As the water evaporates, it draws heat outward, cooling the contents of the inner pot.
Root cellars are man-made caves, carved out of the ground, that provide a cool place to store food—especially root vegetables.
Charcoal coolers are open timber frames filled with moist charcoal. As dry air passes through the charcoal, the water evaporates, cooling the air and the surrounding space.
Yes, you can wrap food in a wet piece of fabric and place it in a cool, shady place. This will only keep food cool for a short period of time. You can also try storing food in a natural spring or well house, or in an icebox, though this requires access to ice.
