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06 Feb 10
12:40
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22 Oct 09
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Yes, then shut door.
Simples |
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that's how you use it, not how it works.
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what is this fridge of which you speak?
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How do you know the light goes off when you shut the door ?
I keep trying to catch it out, but its ALWAYS on , no matter how many times I sneak up and swing the door open ... I have even tried pretending that I'm reading the postcards on the door and then suddenly grabbing the door open ...but to no avail ...the light was on .. |
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Ironically, refrigerators keep things cold because of the nature of heat. The Second Law of Thermodynamics essentially states that if aaa cold object is placed next to aaa hot object, the cold object will become warmer and the hot object will become cooler. AAA refrigerator does not cool items by lowering their original temperatures; instead, an evaporating gas called aaa refrigerant draws heat away, leaving the surrounding area much colder. Refrigerators and air conditioners both workworkwork on the principle of cooling through evaporation.
A refrigerator consists of two storage compartments - one for frozen items and the other for items requiring refrigeration but not freezing. These compartments are surrounded by a series of heat-exchanging pipes. Near the bottom of the refrigerator unit is a heavy metal device called a compressor. The compressor is powered by an electric motor. More heat-exchanging pipes are coiled behind the refrigerator. Running through the entire system is pure ammonia, which evaporates at -27 degrees Fahrenheit (-32 Celsius). This system is closed, which means nothing is lost or added while it is operating. Because liquid ammonia is a powerful chemical, a leaking refrigerator should be repaired or replaced immediately. The refrigeration process begins with the compressor. Ammonia gas is compressed until it becomes very hot from the increased pressure. This heated gas flows through the coils behind the refrigerator, which allow excess heat to be released into the surrounding air. This is why users sometimes feel warm air circulating around the fridge. Eventually the ammonia cools down to the point where it becomes a liquid. This liquid form of ammonia is then forced through a device called an expansion valve. Essentially, the expansion valve has such a small opening that the liquid ammonia is turned into a very cold, fast-moving mist, evaporating as it travels through the coils in the freezer. Since this evaporation occurs at -27 degrees F (-32 degrees Celsius), the ammonia draws heat from the surrounding area. This is the Second Law of Thermodynamics in effect. Cold material, such as the evaporating ammonia gas, tend to take heat from warmer materials, such as the water in the ice cube tray. As the evaporating ammonia gas absorbs more heat, its temperature rises. Coils surrounding the lower refrigerator compartment are not as compact. The cool ammonia still draws heat from the warmer objects in the fridge, but not as much as the freezer section. The ammonia gas is drawn back into the compressor, where the entire cycle of pressurization, cooling and evaporation begins anew. obvious when you think about it. can't believe we're letting burmese immigrants into the country and they don't even have a basic grasp of the second law of thermodynamics. IT is like we've just got an open door policy |
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and the light stays on
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