The zeer pot design which is popularly used consists of two clay pots. The pot in pot refrigerator design keeps fruits and vegetables cool by. If you dont already know, a zeer pot is a type of evaporative refrigerator. The pot in pot refrigerator, also known as a zeer in arabic, is a food cooling device. The zeerpot is an evaporative cooler, which cools the inside by convective. Zeer pot experimentation engineering world health dukewiki. However, this functions best in hot and dry environments as it relies on evaporation to work. The evaporation of the outer liquid draws heat from the inner pot. The fridge potinpot has to stay in a dry and ventilated place. The food that is to be preserved is placed inside the smaller inner pot. A zeer or pot in pot refrigerator consisting of one smaller clay or terracotta pot inside a larger pot and. Pot in pot clay refrigerator or z eer is a low cost traditional technology that can provide cooling refrigeration without electricity. A zeer pot, also known as a pot in pot refrigerator, is an ancient technology that is still used in rural regions where electricity is uncommon. However, a fridge is an energy guzzler that we can live without, if we.
The preferred refrigerator temperature is between 35 and 38 degrees. How to build a pot in pot clay refrigerator or zeer. It is a device that keeps being rediscovered even though various versions of the device have been used for thousands of years. Prepare the washer on the bolt to seal the inner pot. As the moisture evaporates it cools the inner pot, keeping. Staff from the world vegetable center eastern and southern africa office demonstrate the steps in. Evaporative cooling food and agriculture organization. As the water evaporates it cools the inside, letting food stored in the inner pot. The clay pot cooler is a simple and cheap way to keep food. I had to adapt two rajasthani roundbelly ghara clay pots which they use to cool drinking water. What happens if you place the zeer pot in the sun or in the shade. Im currently in udaipur, rajasthan, on the edge of the thar desert and thought i would try the zeer pot fridge.
Heat transfer and evaporative cooling in the function of potinpot. The potinpot preservationcooling system was invented mainly to help rural farmers preserve their farm products. The zeer pot, please dont recommend that i use one. An earthenware pot with a lid on the top is fitted inside a larger pot with an insulating layer of sand in between. The steps for making a potinpot refrigerator are outlined below in case the reader is unable to open pdf files. When we replicated the experiment we used unglazed clay flower pots. Time after setting up the pot in pot refrigerator temperature inside the pot. It applies the basic principle of heat transfer which occurs during evaporation of water. Azeer pot, also known as a potin pot refrigerator, is a simple system composed of two terracota pots, some sand and some water that can maintain a cool temperature to preserver fruits and veggies. Its not the same as having a fridge, but given it doesnt require electricity, this could be an excellent backup for people looking to become more selfreliant.
The first solution that comes to mind is a zeer, or pot in pot refrigerator. Hitchhikers guide to the dilution refrigerator nathaniel craig and ted lester, revised 21 august 2004 introduction dont panic. Online article pdf files in germanenglishfrench are also linked. How to make a refrigerator and survive diabetes in a. If clay pots are already available in the desired shape and design, this part of the manual can be skipped and you can continue with the part. This time the inside of the pot in pot was definitely cooler than the air outside. Zeer pots using evaporation to cool a storage pot the electricityfree fridge. From a family of pot makers, mohammed has made ingeniously simple use of the laws of thermodynamics to create the pot in pot refrigerator, called a zeer in arabic. An experimental study on an evaporative cooler for. Heat and mass transfer analysis of a clay pot refrigerator article pdf available in international journal of heat and mass transfer 55s 1516. At the end of the day, a refrigerator is a convenience, one that we have come to depend on so deeply that it feels like a need. A pot in pot refrigerator, clay pot cooler or zeer arabic. The zeer pot for example provides a good example of a lowcost refrigeration device tested in sudan, nigeria and gambia, using natural evaporative cooling. Those who could benefit from improved vegetable storage and longer shelf life may include vegetable producers, wholesalers, retailers, and household consumers, particularly offgrid, rural communities.
Prepare the central bolt, bolt shut the hole on the outer pot. With some bricks and a little sand, you can keep vegetables cool without refrigeration. The technology was perfected in nigeria by mohammed bah abba. The energy efficiency of refrigerators and freezers has improved dramatically over the past three decades. In zeer pots sand is used as an insulating material which holds. When humidity evaporates from the sand, it dissipates the heat of the internal container, cooling the content inside of it. A potinpot refrigerator, clay pot cooler or zeer arabic. A potinpot cooler is an affordable electricityfree refrigerator which uses the latent heat of. Then, place food items into the inner pot, and cover with a lid or damp cloth. The coolgardie safe is a lowtech food storage unit for cooling and prolonging the life of whatever edibles are kept in it. This is our general expectation when we open the fridge and take something out. But it has a controlled environment, powered by electricity, that keeps the food cold. The space between the two pots is filled with sand, creating an insulating layer around the inner pot.
It needs no electricity it is made by putting a clay pot inside a larger clay pot with wet sand in between the pots and a wet cloth on top. This is a short video clip under the youth in agriculture and enterprise that showcases steps one needs to follow in setting up a charcoal cooler. A pot in pot refrigerator, clay pot cooler1 or zeer arabic. It consists of two earthenware pots of different sizes, placed. The zeer pot depends on outside temperatures and relative humidity. This would seal the water inside the pot and prevent it from evaporating. It consists of one earthenware pot set inside another, with a layer of wet sand in between. You only need to ensure the pot in pot refrigerator is kept in a dry, wellventilated space. In the case of the zeer refrigerator, water evaporates out of the sand through the surface of the outer clay pot and from the whole top surface of the moist sand exposed to the solar radiation, removing. The shelf life of common refrigerated foods free printable. Unless the air is very dry and the pot is exposed to a constant breeze, they generally do not become as cold as a refrigerator, but they will keep vegetables fresh for a couple of weeks. For example, the energy bill for a typical new refrigerator with automatic defrost and top. Cool 10 whole class discussion making zeer pots 20 individuals sequencing why are zeer pots so good. Zeer pot refrigeration technique is a simple evaporative cooling technique used for preservation of fruits and vegetables in hot and dry climate.
Pdf experimental study of alternatives to sand in zeer. It uses a porous outer clay pot lined with wet sand containing an inner pot which can be glazed to prevent penetration by the liquid within which the food is placed. Here you will find cut files for vinyl cutting machines, ai, eps, svg, dxf, dwg along with tutorials and tips for your vinyl cutting hobby or business. According to science in africa, each device can store 12kg of vegetables, keeping them fresh for up to 20 days while costing less than 2usd to produce. The zeer is a large pot inside which fits another smaller pot with a clay lid. Build your own zero energy cooling chamber zecc youtube.
Haz tu propia fruta deshidrata con este genial manual. Nazir is a renowned homeopath doctor offers homeopathy cure by. It uses a porous outer earthenware pot, lined with wet sand, contains an inner pot. The space in between the two pots is filled with sand. A dilution refrigerator, at first blush, appears to be a horribly, intricately.
Experimental study of alternatives to sand in zeer pot refrigeration technique article pdf available may 2015 with 2,671 reads how we measure reads. What can be stored in it meat up to 14 days compared to several hours. Zeer pot electricity free cooling i think that is fantastic i am going to put. As the moisture in the sand evaporates, it draws heat away from the inner pot. If you do have cool dry air and a constant stiff breeze, the interior of a zeer pot can chill down to around 40. The zeer pot is a simple fridge made of local materials. Xps to pdf converter, xml files can be made by the. Pot designs these are simple designs of evaporative coolers that can be used in the home. We then saved the data as a text file, opened it in excel and made this chart. Fridge for the poor 5 market and location context the administrative headquarters of mobah rural horizons, producer of the pot in pot products which is widely termed as the fridge. The basic design consists of a storage pot placed inside a bigger pot that holds water. Potinpot refrigerator simple english wikipedia, the.
The potinpot refrigerators we built at the workshop in malaysia did not work. One solution to this challenge is the zeer pot a very clever fridge made using clay, water and sand. The zeer pot is a refrigeration device invented in africa which operates by the principle of evaporative cooling. Fruits and vegetables for varying amounts of time check frequently for spoilage. Combine all ingredients in a gallonsized plastic freezer bag, remove as much air as possible, and seal. The first clay pot is a large clay pot inside which the second smaller clay pot can be placed. A zeer pot can keep 10 kilograms of food fresh for up to 20 days for decoration purposes only the stand helps with the cooling process diagram of a completed zeer pot on stand with sand filling view from above view from the side making a zeer pot fridge technology dimensions of the inner pot dimensions of the outer pot sand will fill this space. Busting myths about the zeer pot rebuilding civilization.
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