Posts tagged ‘second’

Exhaust Fans Help Cool Your Home During Summer

The upper floor of your home is likely the warmest place in your home. It’s not usually a big deal in the winter, but it can be very uncomfortable in the summer. It happens because hot air rises.

The ceiling of your upper floor also has the most insulation of any place in your home. It’s there because hot air rises — in the winter, you don’t want to lose that heat. It’s the same reason you put a hat on your head in the winter.

In the summer, that thick insulation in your attic is doing the same thing it does in the winter, trapping that heat on your upper floor. If you have a central heating/cooling system, it should suck hot air from the upper floor and mix it with cooler air. But, it’s not always running and it can’t always keep up with the hot air that is produced inside your home, from people, electronics and appliances.

A good solution is to run the ceiling exhaust fan in a central bathroom on the upper floor during the hottest hours of the day. To help, you can get an automatic timer control light switch; these can be used to run the fan and have it automatically shutoff after a certain amount of time — this might also be useful after somebody uses the toilet.

In some regions, it is even part of the building code that an on/off switch for the upper floor hallway bathroom fan is placed next to the thermostat on the main floor. It’s there so you can turn on the exhaust fan when you turn on the air conditioner (there is also a switch in the bathroom to control it from there). This is not a widespread building code, but it’s worth having a look beside your thermostat. If you’ve got a light switch there that doesn’t do anything, try it again and listen for the hallway fan.

Broken Secrets | By: Chad Upton

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Sources: MSU, About.com

June 2, 2010 at 5:00 am Leave a comment

Leap Years and Leap Seconds

Happy New Year!

You probably know that leap years occur every four years. On leap years we add an extra day to keep our clocks and calendars in sync with Earth’s rotation.

On the other hand, most people don’t know about leap seconds. Leap seconds are used for the very same reason as leap years, to keep our clocks in sync with Earth’s rotation.

Because Earth’s rotation varies, leap seconds are added or subtracted up to twice per year when needed. Leap years add a day in February while leap seconds can be added at midnight on December 31st or June 30th when necessary.

An extra day on the calendar isn’t going to go unnoticed, but an extra second is difficult to sense. That’s why most of us don’t know about them. Accurate time keeping devices (atomic clocks) are updated appropriately and you may notice the update on connected devices like cell phones or GPS units, but generally it goes unnoticed by nearly all of us. The last two leap seconds were added on New Year’s Eve of 2005 and 2008. The next time a leap second will be added is not known.

Here’s a video that shows an extra second inserted between 59 and 00 on an atomic clock.

BrokenSecrets.com

Sources: WP – Leap Year, WP – Leap Second, TimeAndDate.com,

January 1, 2010 at 12:01 am 1 comment


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