Radiators and convectors are types of heat exchangers designed to transfer thermal energy from one medium to another for the purpose of cooling and heating. Radiators are constructed to function in automobiles, buildings and electronics. Most radiators and convectors are not designed to transfer heat by radiation. Natural or forced convection is the dominant heat transfer mechanism. When the device uses natural convection to move the second medium it is most aptly called a convector. Also, when it uses forced convection of the second medium it is most aptly called a radiator. Convectors operate as radiators, albeit less efficiently, when the forcing function is disabled. Particularly within buildings, the terms ?radiator` and ?convector` are often incorrectly applied in common usage. Sometimes, the term ?convector` is often used to describe a device that is actually a radiator. A conventional hot-water radiator consists of a sealed hollow metal container, usually flat in shape. Hot water enters at one end and rises to the top of the radiator by way of convection or by pressure from a pump elsewhere in the building. As it gives out its heat, the hot water cools and sinks to the bottom of the radiator, and then is forced out of a pipe at the other end. The pipe either has a large surface area or attached fins to increase its surface area and therefore contact with surrounding air. The air near a radiator is then heated and produces a convection current drawing in cold air. If setup improperly the radiators and their supply pipes make loud noises. The noises resemble someone hammering on the pipes. This is due to the pipes rubbing on surrounding surfaces while expanding and contracting due to heat changes, or by sudden fluctuations of the supplied water pressure. Proper mounting of the radiators and supply pipes will reduce expansion noises. Different types of radiators are used in buildings nowadays. One special type of radiators that has recently found fame is Designer Radiators. Designer Radiators usually have their grills designed into fashionable structures. These Designer Radiators are usually smaller and occupy less space. Designer Radiators increase the beauty and environment of a room, and this is why more and more people are installing Designer Radiators in their homes and buildings.

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I need two large A3 sized silver Photo frames; we are totally redesigning the reception area of the building and going for a clean, modern style. The walls are going to beige, we have bought a large, black plasma television which will be hung up, I have had a new black desk fitted and we have bought two brand new, black leather sofas for visitors to sit on whilst waiting, they are very comfortable and have beige cushions on to match the painted walls. I have been out and got two silver vases and each holds three black plastic flowers. One can sit on the window ledge and the other on my desk. In the reception area we do have pictures which we would like to keep, and this is where the silver photo frames come in. The old photo frames are wooden and it would look out of place with the new décor, as I have nearly spent the budget I need them to look good and also be fairly cheap so I don`t over spend. I have been looking at a website online and also noticed they come in black, they cost a little more then the silver ones, I just need to decided which would look best.