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Low & Appropriate Trusted Technology Feed

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How to Dredge Out the Netherlands without Fossil Fuels

 
The dredging industry has been the backbone of the Dutch economy for centuries. If canals, harbours and rivers weren’t dredged out for a few years, the whole country would literally grind to a halt. Today, dredging happens with oil powered ships. However, the Dutch waterways were dredged mostly by hand for centuries, using simple but […]
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 Human power  Random  No-Tech Magazine
Ditch the Batteries: Off-Grid Compressed Air Energy Storage

 
Going off-grid? Think twice before you invest in a battery system. Compressed air energy storage is the sustainable and resilient alternative to batteries, with much longer life expectancy, lower life cycle costs, technical simplicity, and low maintenance. Designing a compressed air energy storage system that combines high efficiency with small storage size is not self-explanatory, but a growing number of researchers show that it can be done. Compressed Air Energy Storage (CAES) is usually regarded as a form of large-scale energy storage, comparable to a pumped hydropower plant. Such a CAES plant compresses air and stores it in an underground cavern, recovering the energy by expanding (or decompressing) the air through a turbine, which runs a generator. Unfortunately, large-scale CAES...
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 Batteries  Compressed air  Cover story  DIY  Embodied energy  Energy  Low-tech solutions  Solar energy  Wind energy  caes  compressed air energy storage  off-grid  small-scale  Low-Tech Magazine
History and Future of the Compressed Air Economy

 últim editat: Wed, 16 May 2018 00:40:42 +0300  
Compressed air energy storage (CAES) is considered to be an important component of a renewable power grid, because it could store surplus power from wind turbines and solar panels on a large scale. However, in its present form, the technology suffers from large energy losses and depends on natural gas to operate. A look at the 4,000 year long history of compressed air makes clear that this is not unavoidable. Although our ancestors were dependent on less energy efficient technology, they used compressed air in more intelligent configurations that had fewer energy conversion losses and were independent of fossil fuels. These historical systems hold the key to the design of a low-tech, low-cost, robust, sustainable and relatively energy efficient energy...
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 Batteries  Compressed air  Cover story  Energy  History  Power transmission  Solar energy  Wind energy  Low-Tech Magazine
  
Harper PollockHarper Pollock va escriure el següent entrada Fri, 11 May 2018 08:49:08 +0300
New CNI channel & call for curators!
We are also looking for people who want to help finding good sources of high quality inspirations and put some time into re-publishing content with meaningful comments. Such contribution would be highly appreciated and help us take the "CNI Coop Social center" off the ground.

The goal is to create information channels  covering the topics under broad definition of "Liberatory technology" — technology cultivated and implemented to empower self-organised communities.

We can define them as we wish. We have our own server, with installed Hubzilla (federated social network software) and full administrative control. The crucial thing is to get people on board, who'd take care of selectng quality (real, meaningful and practically oriented) content, put some intelligent introduction, hashtags and publish.

We want to make it a popular source among federated networks and bring more people both to the topic of technology as a tool for grassroot political change and to support CNI efforts in this area.

Talk to us, if you are interested. Share anyway.

#Grassroots #Technology #content


#Liberatory #Technology #libtech
  
Harper PollockHarper Pollock va escriure el següent entrada Fri, 11 May 2018 08:44:29 +0300
New CNI channel!
So, we start a new information channel. "Low & Appropriate Trusted TEchnology" aka L.A.T.TE feed.
It has three goals:
— to create a place where hand-picked and curated low-tech solutions will be presented, commented and discussed, outside of corporate media cage;
— to bring more people to our #Hubzilla instance and eventually get them involved in our projects;
— to increase visibility of our (micro)donation system, soon to be implemented online.
You can see the channel here: https://cni-coop.net/channel/cni-latte-feed, subscribe to RSS here: https://cni-coop.net/feed/cni-latte-feed or reach out across federated social media to add us: cni-latte-feed@cni-coop.net

Email connector soon!

#low-tech #lowtech #Appropriate #Technology
Metabolizer your trash!

  
This guy is really good. Sam Smith is in the middle of creating a bio-mimicking technological metabolizer -- a system to convert typical American household stream of waste into some useful resources (including fuel for metabolizer itself). He got into semi-finals of Hackaday's Open Hardware Challenge and has good chance for the main prize. Look at it!
https://hackaday.com/2018/05/09/the-metabolizer-turns-trash-into-treasure/
YT Video

Imatge/foto


#Recycling #Appropriate #tech #SamSmith
Pains and perils of using the renewable energy in a wrong way.

  últim editat: Sun, 06 May 2018 19:07:53 +0300  
The most important part of introducing renewable energy at large is to change the structure and timing of energy consumption. This article shows well documented cases of serious problems, whenever we try to make renewable energy ever-available, without paying attention to it inherent seasonal and daily fluctuations. The text makes it clear that the proper approach is to follow natural tides of energy in the system.

#Energy #Solar #Wind #Macroscale #Economy

LOW-TECH MAGAZINELOW-TECH MAGAZINE va escriure el següent entrada Thu, 14 Sep 2017 00:04:26 +0300
How (Not) to Run a Modern Society on Solar and Wind Power Alone
While the potential of wind and solar energy is more than sufficient to supply the electricity demand of industrial societies, these resources are only available intermittently. To ensure that supply always meets demand, a renewable power grid needs an oversized power generation and transmission capacity of up to ten times the peak demand. It also requires a balancing capacity of fossil fuel power plants, or its equivalent in energy storage. Consequently, matching supply to demand at all times makes renewable power production a complex, slow, expensive and unsustainable undertaking. Yet, if we would adjust energy demand to the variable supply of solar and wind energy, a renewable power grid could be much more advantageous. Using wind and solar energy only...
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  últim editat: Sat, 05 May 2018 23:24:07 +0300  
Low & Appropriate Trusted Technology Feed updated their profile photo

Imatge/foto

Source: http://www.lowtechmagazine.com/2008/12/tile-stoves.html

#Building #heating #stoves #tiles
  últim editat: Sat, 05 May 2018 23:13:16 +0300  
Low & Appropriate Trusted Technology Feed updated their cover photo

Imatge/foto

Source: https://www.math.nyu.edu/~crorres/Archimedes/Screw/SourcesScrew.html
#Archimedes #Vitruvius #Water #Pump
Adjusting energy demand to supply or the other way round?

  últim editat: Sat, 05 May 2018 23:27:09 +0300  
Changing the rhythm of economy to follow availability of renewable resources is in line with general need for sustainability and resilience. Also, including the real cost of ever-readiness of resources (energy storage, transfer or source redundancy) will allow to decide which needs really have to be fulfilled at any time.

The article covers historical and potential future solutions in this area and is very good common base for all real discussion on this topic. The article also mentions the diversity of energy forms, needed for various activities, which opens an avenue to depart from electricity monoculture.

#Renewable #Energy #Macroeconomy #Review

LOW-TECH MAGAZINELOW-TECH MAGAZINE va escriure el següent entrada Thu, 21 Sep 2017 16:44:44 +0300
How to Run the Economy on the Weather
Before the Industrial Revolution, people adjusted their energy demand to a variable energy supply. Our global trade and transport system -- which relied on sail boats -- operated only when the wind blew, as did the mills that supplied our food and powered many manufacturing processes. The same approach could be very useful today, especially when improved by modern technology. In particular, factories and cargo transportation -- such as ships and even trains -- could be operated only when renewable energy is available. Adjusting energy demand to supply would make switching to renewable energy much more realistic than it is today. Stoneferry (detail), a painting by John Ward of Hull. Renewable Energy in Pre-Industrial Times Before the Industrial Revolution, both...
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  últim editat: Sat, 05 May 2018 23:29:11 +0300  
Hypocaustum is a way to transfer heat from a (usually external or underground) stove to the inside of a building, using the mass of the (mostly ground) floor and walls as an accumulation and a system of air chambers and ducts as the transfer medium.
The article describes Roman and medieval implementations and shows transition from hypocaustum to standalone stoves. There are some numbers, derived from an experiment use of hypocaustum in medieval castle in Malbork, Poland.

LOW-TECH MAGAZINELOW-TECH MAGAZINE va escriure el següent entrada Tue, 07 Mar 2017 16:25:13 +0200
Heat Storage Hypocausts: Air Heating in the Middle Ages
Hot air vents in the floor of the Maulbronn monastery. Source: "Das Kloster Maulbronn. Geschichte und Baugeschichte.", Ulrick Knapp, 1997 / Via Spiegel 2016. The Romans are credited with the invention of the first smoke-free heating system in Western Europe: the hypocaust. Until recently, historians had assumed that its technology was largely lost after the collapse of the Roman Empire. In fact, however, it lived on in large parts of Europe, and was further developed into the “heat storage hypocaust”, an underground furnace on top of which granite stones would be piled, to then release hot air through vents in the floor. By this means, a room could be kept warm for days with just one firing of the hypocaust's...
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#Energy #Building #Heating #Construction #Stoves #Hypocaustum #Roman #Medieval