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TODAY IN HISTORY

    BALLISTIC MISSILE SUBMARINE
    December 30, 1959 - United States

    The first U.S. ballistic missile submarine, the nuclear-powered U.S.S. George Washington, was commissioned. The 380-ft-long ship had 16 vertical missile launch tubes, able to fire Polaris missiles even while the vessel was underwater. Building it began on 7 Nov 1967 at Groton, Connecticut, at a cost of about $110 million. It was launched 9 Jun 1959. The following July, it successfully tested the launch of two Polaris missile while submerged. On its first duty patrol (15 Nov 1960 - 21 Jan 1961) the ship spent 67 days travelling underwater. Two complete crews, of 130 men each, rotated after each 60-day period (after a 30-day resupply and refit period) to get the maximum use of the submarine on extended patrols.

    SADDAM HUSSEIN HANGED
    December 30, 2006 - Iraq

    Saddam Hussein has been hanged in northern Baghdad for crimes against humanity. Iraqi state TV showed images of him going to the gallows before dawn in a building that his intelligence services once used for executions. The moment of his execution was not shown, although pictures of his body wrapped in a shroud were later broadcast on TV.

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  • A Change is Gonna Come
    by Meredith Grey

    "...Change; we don't like it, we fear it, but we can't stop it from coming. We either adapt to change, or we get left behind. It hurts to grow, anybody who tells you it doesn't is lying. But here's the truth: Sometimes the more things change, the more they stay the same. And sometimes, oh, sometimes change is good. Sometimes change is everything...."
  • Happiness
    by Thomas Jefferson

    "...Our greatest happiness does not depend on the condition of life in which chance has placed us, but is always the result of a good conscience, good health, occupation, and freedom in all just pursuits...."

RANDOM FACTS

  • Harvard Medical School
    about Eyesight Myth and Fact

    Myth: Staring at a computer screen all day is harmful to the eyes. Fact: Spending the day staring at a screen can tire or strain your eyes, but it will not hurt them. Make sure lighting doesn't create a glare on your screen. When spending long periods at your keyboard, take a break now and then to rest your eyes to reduce fatigue. Also, don't forget to blink. Your eyes need to stay lubricated to feel comfortable. Salary
    about Steve Jobs

    Steve Jobs' annual salary was $1, just enough to keep company health benefits.

Going further inside HVAC :

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Regardless of whether you're a skilled heating technician or perhaps are interested in the Heating and cooling marketplace then this article may be for you.

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Whether you are an experienced heating technician or simply just have an interest in the HVAC sector then this write-up is designed for you. It'll provide you with a backdrop to the HVAC sector to make sure you will be more aware about the areas it encompasses. The first aspect we are going to take a look at is the topic of heating. What exactly do we mean by heating? It does depend upon what you will be heating up. As an example if you are looking to warm up the front room in your home on a cold winters night then you may just need a portable heating device. However if you are looking to heat a larger area you might need to use something else entirely.

Many buildings use a central heating system to supply heat. This approach might use a central heating boiler, heat pump or possibly a furnace. Heat created will then be dispersed using a system of piping or ducts. The dispersal network will be chosen dependant upon the building that is being heated up and the type of central heating unit in use. The second letter in the abbreviation HVAC is V for ventilation. Ventilation comes in various forms but is going to fit in 1 of 2 areas. Either forced (also called mechanical) ventilation or natural. Mechanical ventilation can be achieved through the use of fans to either remove air or to inject fresh air in to a room.

Natural ventilation is much easier to achieve, believe it or not as simple as opening up a window. However typically this will be accomplished by either a vent or even air bricks. One benefit of natural air flow is it can help to eliminate the spread of airborne diseases such as the flu virus. Another good rationale to implement natural ventilation is the fact that it truly is inexpensive plus relatively easy to operate. Ventilation is essential in establishing a heating system. The explanation for this is whenever there is very poor ventilation then there could be a build-up of gases.

This might trigger smaller challenges including ineffectiveness in the heater or larger challenges., for instance a large amount of carbon monoxide might cause poisoning or possibly loss of life. Last of all we come to the air conditioner component of HVAC. Air conditioning may be put in position with fans but a majority of solutions operate in the same basis as the air-con inside your car. This process usually operates by using a special fluid in pipes. As this liquid warms up it'll take in the heat when it turns into a gas. This'll then travel around the system as a gas to become re-condensed, starting the complete process once again.

The fantastic thing about some air conditioning units is this technique can be altered to produce heating instead. Of course this will not work with all air conditioners but it's a feature to be familiar with. So there you have every one of the aspects that comprise HVAC, discussed in a little more detail. However this is merely an outline. Next, to be able to learn even more details regarding

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  • Ambirad
    A leading European manufacturer of gas-fired radiant heaters and supplier of warm-air systems and air curtains.

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