By Faustine Arnaud. Electrical Wiring. Publised at Sunday, February 04th 2018, 20:10:14 PM. Arc fault circuit interrupters (AFCIs) protect a home against electrical fires. ACFIs protect against fire-causing arcing much like GFCI’s protect against stray current. When an arc is detected, power to the circuit is interrupted. Arcing can be caused by any number of factors, including damaged or worn wires, incorrect wiring, and loose or wet connections. Newer AFCIs are able to distinguish between dangerous arc faults and normal arcing caused by fluorescent lighting and some dimmers and switches.
By Claudette Alice. Electrical Wiring. Publised at Sunday, July 30th 2017, 07:19:56 AM. Whenever we flip a switch, plug in an appliance, or adjust a reading light, we interact with the electrical system in a house. A good electrician can make those interactions easier in a hundred little ways, so it's best to communicate your needs early—ideally after the house is framed and before the drywall or insulation goes up. That's when master electrician Allen Gallant, who has wired many This Old House TV projects, takes his customers on a job-site walk-through, showing where he plans to put switches, lights, and receptacles. "I'll even ask them if they're left-handed or right-handed," he says. "It makes a big difference when you're looking for the light switch." It's easy to make changes at this point in the process, but once the walls are closed in, any second thoughts become far more difficult and expensive to implement.
By Sebastien Abel. Electrical Wiring. Published at Sunday, February 04th 2018, 05:32:41 AM. “Anywhere there is the chance of contact with water or the ground, there should be a GFCI,” says Brett Brenner, president of the Electrical Safety Foundation International (ESFI). “It’s estimated that GFCIs accounted for roughly a 70 percent reduction in electrocutions,” he says. GFCIs are also available as circuit breakers installed in the panel, giving ground fault protection to designated circuits in the home.
By Morgane Seraphine. Engine Wiring. Published at Saturday, February 03rd 2018, 14:07:38 PM. In the 16th century, inventors created a form of internal combustion engine using gunpowder as the fuel to power the movement of the pistons. Actually, it wasn’t the gunpowder that moved them. The way this early internal combustion engine worked was you’d stuff a piston all the way to the top of a cylinder and then ignite gunpowder beneath the piston. A vacuum would form after the explosion and suck the piston down the cylinder. Because this engine relied on the changes in air pressure to move the piston, they called it the atmospheric engine. It wasn’t very efficient. By the 17th century, steam engines were showing a lot of promise, so the internal combustion engine was abandoned.
By Thibault Margaux. Engine Wiring. Published at Saturday, February 03rd 2018, 05:06:41 AM. "We first needed to understand how much heat was available from the powertrain during various drive cycles and cold start conditions," he says. By simulating thermal components that control the powertrain heat, such as the electronic thermostat, cooling fans, grill shutters, and water valve, they determined the best way to distribute the available energy.
By Faustine Arnaud. Engine Wiring. Published at Saturday, February 03rd 2018, 03:25:47 AM. Building on that work, in 1864 two German engineers named Nicolaus August Otto and Eugen Langen founded a company that made engines similar to Lenoir’s model. Otto gave up managing the company and started working on an engine design that he had been toying with since 1861. His design led to what we now know as the four-stroke engine, and the basic design is still used in cars today.
By Marthe Mathilde. Engine Wiring. Published at Friday, February 02nd 2018, 23:28:21 PM. From my position at Oak Ridge National Laboratory, I have been able to see the intersection of knowledge discovery, advanced engine and vehicle technology development, and the use of one-of-a-kind computing resources. Although the public tends to think of automobile and engine research as a purely private-sector concern, my colleagues and I at ORNL are helping to realize the full efficiency potential of internal combustion engines.
By Claudette Alice. Engine Wiring. Published at Friday, February 02nd 2018, 09:45:36 AM. Internal combustion engine efficiency has historically been limited more by the state of technology than innovation. As an example, the potential of technologies such as gasoline direct injection were known and attempted in production more than 50 years ago, but direct injection has only become widely available in production within the last decade and now makes up approximately 38 percent of new light-duty vehicle sales. Another example is low-temperature combustion modes such as homogeneous charge compression ignition combustion—in which fuel and air are injected during the intake stroke and then compressed until the entire mixture reacts spontaneously—which were demonstrated in a laboratory more than 30 years ago but are still many years away from market introduction.
By Claudette Alice. Engine Wiring. Published at Friday, February 02nd 2018, 05:43:02 AM. It wouldn’t be until 1860 that a reliable, working internal combustion engine would be invented. A Belgian fellow by the name of Jean Joseph Etienne Lenoir patented an engine that injected natural gas into a cylinder, which was subsequently ignited by a permanent flame near the cylinder. It worked similarly to the gunpowder atmospheric engine, but not too efficiently.
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