MetaEfficient Reviews

An Energy Producing Home In Disguise

benjamin — Thu, 05 Nov 2009 23:24:44 +0000

The Energy Producing Home (image: Neumann Developments)

Who says that a home with cutting-edge energy efficiency has to look like an ultra-modern pod? This recently completed Wisconsin home packs so much energy tech that it makes money by selling electricity back to the grid, and it still keeps a low neighborhood profile.

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The Best Shower Filters Of 2009

Justin — Mon, 26 Oct 2009 22:04:38 +0000

I just replaced my shower filters, so I thought I’d update my best shower filter review from earlier this year. Each update to the review generates a lot of useful comments. So I’m incorporating what I’ve learned from those comments into this latest review. (more…)

Kite Gen – The Future Of Wind Power?

benjamin — Wed, 21 Oct 2009 17:22:01 +0000

Kite Gen Wind Power Generator (photo: Kite Gen Research S.r.l.)

Wind power holds great promise as a clean energy source, but current windmill generators aren’t appropriate for all locations. Italian firm Kite Gen hopes to change that with its innovative new generator designs, which use “kites” to capture strong high-altitude winds.
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The Best iPhone Battery Pack

Justin — Tue, 29 Sep 2009 04:54:15 +0000

The Best iPhone Battery Pack

The iPhone can be power-thirsty. For many people a battery extender is an essential iPhone or iTouch accessory. Here are four of the best backup iPhone battery packs.

Note: iPhone battery performance times vary widely based on individual usage habits and applications. Wherever possible we have tried to give details of a backup battery’s capacity relative to an iPhone’s full charge.

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Liquid-Filled LED Bulbs: 360 Degree Light

Justin — Sun, 13 Sep 2009 20:53:53 +0000

Liquid-Filled LED Light Bulbs: HydraLux

I’ve been testing a new LED bulb called the HydraLux. These unique bulbs are filled with a clear liquid coolant (a non-toxic paraffin oil). Other LED bulbs use large metal fins or fans for cooling purposes. The advantage of using a liquid coolant is that the LED bulb can produce 360° light like a regular incandescent bulb. (more…)

How To Build A Deep Bass System For $750

Justin — Thu, 23 Jul 2009 18:41:50 +0000

In this article I will describe how to build a high-fidelity, bass-intensive sound system for under $1000. The secret ingredient of the system is the use of tactile transducers. These transducers effectively eliminate the need for expensive woofers or subwoofers. It’s an efficient method of producing deep, high-fidelity bass for a fraction of the usual cost. Many of the ideas presented here were gleaned from the recommendations of audio enthusiasts, and the book High-Performance Audio Systems by Robert Harley.

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The Best Headphones Noise Canceling

benjamin — Tue, 14 Jul 2009 16:44:41 +0000

The Best Headphones Noise Canceling

Headphones with active noise cancellation technology let travelers hear their music with greater clarity and less ear fatigue. These headphones are useful for those who want to seal out their surroundings, since noise cancellation circuitry is especially effective at countering low-frequency tones (like crowd noise or engine noise on an airplane). Here are four of the best noise-canceling headphones on the market.

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Updates From The MetaEfficient Kitchen Labs

Justin — Sun, 05 Jul 2009 07:12:00 +0000

This summer I’ve been working on food-related optimization projects, here are some updates:

I now have subscriptions with two local farmers (through a CSA or Community Support Agriculture). One farmer provides me with raw milk, raw butter and eggs, the other farmer provides vegetables and fruit. They both happen to deliver to same street in my neighborhood, so I ride my bike about one kilometer and pick up both deliveries using a bike trailer. (more…)

Use An Ozone Generator To Purify Your Air and Water Inexpensively

Justin — Sat, 04 Jul 2009 17:47:51 +0000

One of the simplest and most inexpensive ways to purify water is to bubble ozone through it. Ozone is a molecule made of three oxygen atoms ( O₃₎. It disinfects water very effectively, through a process called oxidation. Ozone ruptures the cellular structure of organisms, killing them. It also oxides toxic organic chemicals, minerals and metals by reducing them to their insoluble form, so that they can be filtered out. This means it neutralizes most of the compounds that cause odor and off-tastes. Note, however, that ozonation does not remove nitrates, sulfates or heavy metals (see my article on water filters to find how to remove these). (more…)

A Solar Flower Tower Rises In The Desert

Justin — Tue, 23 Jun 2009 16:14:26 +0000

This unusual solar tower was designed by Israeli architect Haim Dotan for AORA Solar. It is set to launch on June 24 in South Israel.

The tower has 30 tracking mirrors (heliostats) that reflect sunlight towards the top of a 30-meter high solar tower. The top of the tower has a special solar receiver and a 100kw gas turbine.

The patented receiver uses the sun’s energy to heat air to a temperature of 1,000 degrees Celsius and directs this energy into the turbine. The turbine in turn converts the thermal energy into electric power that is fed directly into the national power grid. (more…)