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Tuesday, December 20, 2011
Thursday, December 15, 2011
Basic Principles Of Heat
You'll notice that frequently the physical dimensions or power requirements are listed for particular kinds of appliances. You certainly do not have to memorize these figures; rather, the idea is to acquaint you using the numerous options available from manufacturers and to prompt you to think about size and utility usage when outfitting your kitchen. Before you learn about the kinds of ranges and ovens available, it would be helpful to realize a few cooking-related terms. This is info you may have already learned in your culinary training; however, it is important enough to summarize briefly the cooking processes that are central to each kitchen. Conduction is the simplest form of heat transfer. Heat moves directly from one item to an additional when they're brought into direct contact with every other. Poaching, boiling, and simmering are all examples of conduction cooking. Induction cooking creates heat when an electromagnetic field is created between stovetop and pan, creating currents which are converted to heat by the natural resistance of the metal pan.
This electromagnetic field can be achieved only if the pan is made of ferrous metal, such as cast iron or stainless steel; nonmagnetic copper and aluminum pans will not work. Induction cooking surfaces don't become warm, because the heat is transferred directly into the pan. When the pan is removed from the heat source, the induction process ends automatically, with no residual heat. Convection happens when heat is distributed by moving air, steam, or liquid. The simplest form of convection occurs when you stir a thick sauce, for instance, to circulate it and heat it thoroughly within the pan. Convection cooking was discovered when U.S. Navy researchers placed fans in standard oven compartments to see if foods might be cooked a lot more rapidly when warm air was blown around it. They discovered that, indeed, the convection process cooked food faster and more evenly, no matter where within the oven the foods was placed.
Why? Simply because the warm air reduces the cool "boundary layer" at the surface from the foods, allowing the heat to penetrate the food faster. Radiation happens when waves of energy hit the food and cause a heating reaction. Two kinds of radiation are used within the kitchen: infrared and microwave. In a broiler, the heating element becomes warm sufficient to release infrared radiation, which cooks foods really quickly. The other type, the microwave oven, used to be known as magnetron cooking and was developed during World War II. U.S. airmen noticed they could keep their coffee warm by setting it near the plane's radar equipment box. The short, electromagnetic waves emitted at the speed of light react to moisture, which is found in almost all foods. The moisture molecules in the coffee cup create friction as they try to align themselves using the microwaves, and friction creates heat. These days, this easy principle has discovered its way into almost every American house.
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Wednesday, December 7, 2011
Used Home Appliances
Any appliance is designed after taking into consideration the needs of users and the environment in which it is going to be used. Manufacturers of appliances conduct research on the usability of their models based on consumer feedback. They apply the results of such research in developing new models in which the loopholes present in earlier designs are plugged. As new models are launched, it is common for many consumers to replace their existing appliances, which might have become outdated. Used appliances don't necessarily have to be discarded, as there is a significant demand for second hand appliances too. Used home appliances such as refrigerators, air conditioners, microwave ovens, dishwashers and washing machines are cheaper than new ones because of the depreciation factor.
Before buying a used home appliance, it is essential to check the extent of its usage and reconfirm that it is in working condition. It is always advisable to get a used appliance checked by a technician before purchase.
Some people prefer disposing off used home appliances when they do not get a good offer from buyers. In such situations, the discarded home appliance can be transported to a special factory, where the discarded appliance is split into parts and disposed off. This is usually done in accordance with environmental protection laws. Burning, burying or decontamination can dispose off harmful or poisonous parts. The parts, which are safe to be used, can be assembled as second hand appliances and returned to the market. A number of exporters, suppliers, manufacturers, factories and distributors engage in the business of dealing in used home appliances. In Japan, there is a law that ensures recycling of used home appliances because of the high cost of treating discarded ones to make them environmentally safe.
Used home appliances contain Chlorofluorocarbons (CFC), leaded glass and other hazardous chemicals. It is generally recommended that the clutter in the form of useless second hand appliances should be discarded. Some people prefer to donate used home appliances to religious or social organizations.
Saturday, December 3, 2011
Radiator Cover
A radiator is a heat-exchanging device that either absorbs or radiates heat. A typical radiator has a copper or aluminum tube bent several times to form a rectangle. These multiple loops help increase the internal surface area of the radiator and help in the cooling and heating process.
Radiators are common in homes, especially those located in cold regions. Unlike automotive radiators, where the device functions as a cooling element, building radiators primarily serve the function of heating the apartments. The radiator is warmed by hot water being pumped into it from a water heater. The hot water, when passing through the main radiator, gives out hear through the aluminum body and then sinks back to the bottom of the device. Although radiators are effective heating devices, their appearance tends to hamper the aesthetic beauty of the room. Most radiators are bulky in size and their aluminum body clashes with the rest of the room décor. Radiator covers are the perfect cure for this problem.
Radiator covers, as the name suggests, are enclosures for the radiators. These may be made of wood, aluminum, brass or fiberboard. These covers not only shield the unsightly radiator but also enhance the heating effect of the device. A normal radiator's heat goes off into all directions of the room. One the other hand, a radiator cover, with its straight fins, directs the warm air in a particular direction, hence maintaining a consistent temperature in the room.
Radiator covers serve several other purposes as well. They function as protective devices, shielding people from the extreme heat that can be generated. Radiators can pose severe burn hazards if left unattended. Some of the modern radiator covers can also double up as storage devices.
Some experts claim that radiator covers tend to hold back heat and as a result use up more energy. However, if the radiator is properly designed and well maintained, this problem can be overcome. Overall, radiator covers are sure to enhance the process of heating and add to the aesthetic beauty of a room.
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