Wiktor Wise
Before the invention of electricity, our ancestors used natural methods to preserve food. In modern times, with the adverse effects of electricity on the environment, people are looking for ways to build refrigerators without electricity. There are many ways to build a fridge without electricity, such as using clay pots, underground storage, propane refrigerators, and root cellars. These methods are inexpensive, sustainable, and environmentally friendly.
| Characteristics | Values |
|---|---|
| Type | Non-electric DIY mini-fridge |
| Materials | Ceramic/terracotta pots, sand, water, cloth |
| Mechanism | Evaporative cooling |
| Food Storage | Prepared food, fresh food |
| Maintenance | Monitor temperature, limit constant opening |
| Alternative Methods | Root cellar, spring house, underground storage, propane refrigerator |
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What You'll Learn
Use clay pots, sand and water to create evaporative cooling
Clay, sand, and water can be used to create evaporative cooling to build a fridge without electricity. This type of cooling is based on the principle of wind-induced evaporation, which has been used for centuries in different parts of the world. In some regions, this clay pot cooler is called a "zeer".
To create a zeer pot, you will need two clay pots of different sizes, with the smaller one fitting inside the larger one. The pots should be unglazed terracotta or clay to allow for evaporation through the outer surface. Start by placing a layer of sand in the bottom of the larger pot and then inserting the smaller pot inside. Pour sand into the gap between the two pots, filling it to just below the rim. Ensure the sand layer is relatively uniform and level with the larger pot.
Now, slowly pour water onto the sand. Continue pouring until the water begins to pool on the surface. The water will be drawn up by the sand through capillary action, moistening the walls of the pots. Place a wet cloth, such as a tea towel, over the smaller pot to aid in evaporation and cooling. The damp fabric will help keep the contents inside cooler for a longer period.
Finally, position your zeer pot in a shaded and well-ventilated area. Avoid direct sunlight as it can warm up the pots, reducing the effectiveness of evaporative cooling. A constant breeze or wind will enhance the cooling effect by aiding in the evaporation process. This setup is ideal for low-humidity climates and can help keep vegetables and perishable foods fresh for longer without the need for electricity.
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Dig a hole or use an old well to store food
If you're looking for a way to store food without electricity, one low-tech solution is to dig a hole in the ground or repurpose an old well. Here are some tips to make the most of this method:
When digging a hole, aim for a depth of 1-3 feet (0.30-0.91 m). This depth will provide a cool subterranean space to store your food. It's best to keep the hole away from your living area to avoid any smoke from cooking fires and to reduce the chance of attracting large, aggressive animals with the scent of cooked food.
Before placing food in the hole, line it with moss, sod, straw, or leaves. This natural insulation will help regulate temperature and keep your food cool. Then, place your food inside and cover it with more moss, sod, straw, or leaves. Refill the hole with the soil you removed, and consider marking the spot so you can easily find it later. This method of camouflage will not only help keep your food storage location discreet but also protect your food from scavengers and roaming animals.
If you're using an old well, lower your food into it with a rope or cord. This method ensures your food is out of reach of any animals that might be tempted by it.
When it comes to the food itself, opt for non-perishable items with long shelf lives. Canned and dried foods are excellent choices, as are bulk staples like wheat, corn, beans, and salt. Canned meats, rice, and pasta products are also good options. Remember to check infant formulas for expiration dates and plan accordingly if you need to store baby food.
Additionally, consider using containers to protect your food from pests and moisture. Glass jars, hard plastic containers, and metal tins are all suitable options. These containers will help keep your food fresh and edible for longer.
By combining these techniques, you can effectively store food without electricity, making use of the natural cooling properties of the earth and some clever food storage practices.
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Construct a 'spring house' over a spring
A spring house, or springhouse, is a small building, usually consisting of a single room, constructed over a spring. The original purpose of a springhouse was to keep spring water clean by preventing leaves, animals, and other contaminants from entering. The enclosing structure was also used for refrigeration before the advent of electric refrigeration. The water of the spring maintains a cool temperature inside the spring house throughout the year, allowing food that would otherwise spoil to be kept there.
- Identify a suitable spring: Look for a natural cold water spring that has an adequate water flow and is located on your property or in an accessible area.
- Design the spring house: The spring house can be constructed using various materials, such as concrete blocks, wood, or stone. Ensure that the design includes a method to collect spring water, protect it from contaminants, and deliver it to its point of use if needed.
- Prepare the site: Clear the area around the spring and level the ground if necessary. Mark out the boundaries of the spring house to ensure it is constructed directly over the spring.
- Construct the foundation: Build a solid foundation for the spring house using concrete or stone. Ensure that the foundation is sturdy and can bear the weight of the structure.
- Build the walls and roof: Using the chosen building materials, construct the walls and roof of the spring house. Ensure that the structure is well-ventilated and consider including windows or openings to allow for air circulation.
- Install collection and delivery systems: Implement methods to collect the spring water and protect it from contamination. This may include constructing a spring box or installing pumps and pipes to deliver the water to its point of use.
- Finish the interior: Install any necessary shelves or storage systems inside the spring house. Ensure that the floor is sturdy and consider lining it with a waterproof material to protect against moisture.
- Test and maintain: Once the spring house is constructed, test the spring water collection and delivery systems to ensure they are functioning properly. Regularly maintain the spring house by cleaning and inspecting it to prevent contamination and structural issues.
By following these steps, you can construct a spring house over a spring to take advantage of natural refrigeration and collect clean spring water. Spring houses have been used for centuries and continue to be valuable structures for water collection and food preservation.
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Build an underground 'root cellar'
Building an underground root cellar is a great way to remain self-sufficient without electricity. Root cellars are largely unnecessary for the average person, but they can be a useful way to store large amounts of produce without the need for a refrigerator.
Before you start building, there are a few things to keep in mind. First, verify with local authorities that there are no underground utilities that might conflict with your excavation. Second, check your local building codes and homeowner's regulations to ensure that you have the necessary permits and are building to code. Finally, choose a location with good drainage that is not prone to flooding. Ideally, this would be on a hillside facing north, limiting exposure to the opening of the cellar.
Once you have found a suitable location, it's time to start digging. The depth of your root cellar will depend on your climate. In warm areas closer to the equator, you'll need to dig deeper to access cooler temperatures. However, if you live in an arctic region, you'll need to be careful not to dig so deep that you hit permafrost. On average, your root cellar should be about 10 feet (3 meters) deep. Always set back the sides of the hole on a slope to prevent a cave-in, and make sure the cellar is below the frost line, which is typically about 36 to 48 inches (91 cm to 1.2 m).
Now it's time to build the structure of your root cellar. Building materials can include native stone, concrete cinder blocks, earth-packed tires, or cedar logs for walk-in root cellars. Concrete cinder blocks are the most common choice as they are readily available from DIY stores. You can also use a fiberglass water tank, such as a 50-gallon (189.3 L) plastic drum, and bury it in the ground. Cover your structure with 1 foot (30.48 cm) of dirt or other coverage for temporary fall storage.
Next, you'll need to install a vent to maintain the ideal temperature and humidity levels in your root cellar. Use two PVC pipes: one entering low to the floor to let cool air in and the other near the ceiling to vent out hot air. Screen the vent pipes to keep out pests and protect your produce from extreme temperatures. Create an entry to the root cellar, usually with two doors: one at the surface and another at the wall opening to the cellar. This entryway acts as insulation, helping to keep the cool air in.
Finally, add some finishing touches to your root cellar. Install stairs to provide easy access and a door to seal the cellar and keep unwanted visitors out. You can also add shelves to store canned goods and preserves, as well as vegetables like potatoes and squash. Certain types of vegetables may require damp materials to stay fresh, so be sure to accommodate their needs.
And there you have it! Your very own underground root cellar, providing a natural and electricity-free way to store your produce.
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Use propane gas to create a chemical reaction
Propane gas can be used to create a chemical reaction to build a fridge without electricity. This process, known as "absorption cooling" or "absorption refrigeration", was first developed by Michael Faraday in 1824.
The propane refrigeration process involves a sealed system of tubes and chambers containing liquids and gases that experience a chemical reaction under heat and pressure. This reaction, with the help of condensers and compressors, creates a drastic cooling process.
The process starts with a propane flame heating a chamber containing a mixture of water and ammonia until it boils. The ammonia gas rises into a condenser, where it cools and returns to a liquid state. This liquid then flows into another chamber, the evaporator, where it mixes with hydrogen gas.
When the ammonia and hydrogen gas mix, a chemical reaction occurs that pulls or absorbs heat from inside the refrigerator, creating a cooling effect. As the solution absorbs enough heat, the ammonia turns back into a gas, and the cycle starts over again. This self-contained system is reliable and economical, making it a popular option for those without access to electricity or those looking for an off-grid solution.
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Frequently asked questions
A simple, inexpensive, and time-tested way to build a non-electric mini-fridge is to use a clay pot cooler, also known as a zeer. You will need two terracotta pots, one slightly larger than the other, along with some sand and water. Place the smaller pot inside the larger one and fill the space between them with sand. Pour water onto the sand and cover the pots with a wet cloth. As the water evaporates through the clay, it will cool the inner pot.
Another option is to use a metal or plastic container instead of clay pots in the previous method. The principle of evaporative cooling remains the same.
Dig a sizable hole or use an old well to create an underground storage unit for your food. If you have the time and resources, you can create a concrete top with an opening for access. Alternatively, build a cold room within your home to serve as a natural food store.
Yes, you can construct a root cellar or a spring house. A root cellar is excellent for storing canned and freshly harvested foods, while a spring house is built over a spring, using the cool water to create natural refrigeration.
