Victor Papanek described this in his book Design for the real world: Quote: At Cal Arts one of my graduate students, Jim Hennessey, and I were more concerned as to how Third World people could keep part of their perishables fresh for a week or two, starting now. We developed a hand-cranked, modular produce cooler. There is a baseboard unit that includes a tyre pump, a heat exchanger, a pump, pump valves, and a metering valve, as well as a hand crank. This is surmounted by a 50 cm.
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Must be environment friendly. Among several available refrigerants the most promising one are ammonia, methanol, water which have relatively high latent heat values and also presents good performances. The most commonly used pairs are zeolite- water, zeolite-methanol, silica gel- water, carbon — methanol and activated carbon — ammonia. Also zeolite crystals are eternal i.
The refrigeration apparatus consists of two chambers, a pressure gauge, a refrigerating chamber, a vacuum pump which is run by pedaling , valves and connecting pipes. This is also known as the Adsorber. It adsorbs the vapor coming from the evaporator chamber.
It consists of the evaporator chamber during the adsorption stage and the condenser during the desorption stage. Refrigerator Body : The Refrigerator body is a thermally insulated compartment. The evaporator is located at the top inside the cooling chamber.
Warmer air around the evaporator stays in this upper region. The air only cools down in the cooling phase, when it falls to the bottom of the cooling chamber. The Adsorption Stage : In the adsorption process, the valves V2 and V3 are opened, and the vacuum pump is used to extract all the air from the Zeolite cylinder and create complete vacuum inside it.
The valve V2 is then closed and the evaporator is then connected to the vacuum pump by opening valves V1 and V3. The pressure inside the evaporator is lowered such that Adsorbate starts boiling at room temperature. The valve V3 is then closed and the Zeolite chamber and evaporator are connected by opening the valves V1 and V2. As a result of heat loss from the refrigerating chamber, its temperature starts to fall.
The Desorption Stage : As soon as the Zeolite becomes saturated and is incapable of adsorbing more adsorbate, the Zeolite container is heated such that the Zeolite loses adsorbate and it gets collected in the condenser.
The heat may be provided by using Solar energy making it completely eco-friendly and very less dependent on electricity. Regeneration of zeolite occurs by heating the zeolite container opening the valves V1 and V2 such that the water lost by the zeolite reaches back to the condenser. Hence, solar energy can be utilized for regeneration.
TBI Innovations: The Mechanical Fridge – Freezing Environmental Damage
It not only runs without electricity but can also be available to the poor as an inexpensive and necessary utility option and no longer as a luxury one meant only for those with large pockets. From The Better Home Technology is indeed like a two-sided coin. While we can go gung-ho about technological progress and how it has simplified our lives, we can also talk about in the same breath about the adverse effects of technology, particularly on the environment. Take the refrigerator, for example. It is a remarkable technological offering that has made our lives a lot cooler. But the refrigerator too has two sides to it. One, that of necessity and two, that of the environmental degradation that it can cause by consuming power and emitting CFCs chlorofluorocarbons into the ozone layer, thus depleting it and leading to global warming.
Pedal-Powered (Vacuum) Zeolite Refrigerator
Must be environment friendly. Among several available refrigerants the most promising one are ammonia, methanol, water which have relatively high latent heat values and also presents good performances. The most commonly used pairs are zeolite- water, zeolite-methanol, silica gel- water, carbon — methanol and activated carbon — ammonia. Also zeolite crystals are eternal i. The refrigeration apparatus consists of two chambers, a pressure gauge, a refrigerating chamber, a vacuum pump which is run by pedaling , valves and connecting pipes.
Pedal-Powered (Vacuum) Zeolite Refrigerator
The drop in methanol vapor pressure causes methanol to boil. To do this, methanol must capture the heat of a system the inside of the refrigerator. After only about 10 minutes of pedaling, the valve to the vacuum pump can be turned off, and the line of zeolite vessel open. The zeolite then absorbs the vapor produced by the boiling of the methanol and for the liquid methanol to remain in equilibrium with the vapor phase; It should continue boiling for up to one day.