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Heat Exchanger Systems

THE PETER SMITH VALVE COMPANY LTD wWW.PETERSMITHVALVE.CO.UK HEAT EXCHANGER SYSTEMS A heat exchanger is a device that enables heat from a liquid/gas to pass to a second liquid/gas without them coming into direct contact with each other. The key principle of a heat exchanger is that it conveys the heat without transferring the fluid that carries it. HOW A BASIC HEAT EXCHANGER WORKS The hot fluid (in red) flows through a coiled tube inside a larger shell. The larger shell contains the colder fluid (in blue) which is running in the opposite direction. The hot fluid cools down and the cold fluid warms up, without them actually mixing. нОТ ВEFORE COOL AFTER нОT AFTER COOL BEFORE You can see heat exchangers in all kinds of places, usually working to heat or cool buildings or helping engines and machines to work more efficiently. Refrigerators and air-conditioners, for example, use heat exchangers in the opposite way from central heating systems: they remove heat from a compartment or room where it's not wanted and pump it away to another place where it can be expelled. MOST COMMON TYPES OF HEAT EXCHANGERS SHELL & TUBE PLATE/FIN This heat exchanger uses plates and fins with a big surface area to convey heat between fluids. It is commonly referred to as a compact heat exchanger to emphasize its relatively high heat transfer surface area to volume ratio. This heat exchanger uses one fluid which circulates through a set of metal tubes while the second fluid flows through a sealed shell surrounding them. BEST MATERIALS TO USE МЕTALS Good for quickly absorbing and conducting heat. CERAMICS Good choice for applications over 1000°C or 2000°F that would melt metals such as iron, copper and steel. Also commonly used for fluids that are corrosive and abrasive with either high or low temperatures. PLASTICS Weigh less and are cheaper than other metals. They can also combat corrosion and be engineered to have good thermal conductivity. They are good options for things like swimming pools or showers that will run at normal room temperature. DOUBLE BLOCK & BLEED VALVES Heat exchanger systems are just one of the typical applications that a Double Block & Bleed valve is used in as they play a crucial role in situations where critical isolation is needed to ensure that leakage does not occur. Here is a diagram of a Double Block & Bleed valve: BLOCK VALVE BLOCK VALVE BLEED FLANGE PROCESS FLUID DRAIN VALVE 1 A Double Block & Bleed valve is used to stop process fluid from getting into an area where work is being done. Both In-line valves are closed. The Bleed Flange is then opened. Fluid/Steam is drained once both valves are closed to ensure 3 safe working on the non pressure side of the system. The Peter Smith Valve Company Ltd are specialists in the design and manufacturing of Double Block & Bleed valves and other small to medium Isolation valves for the control of fluids and gases in most pipe conveying systems. For more information on our products visit www.petersmithvalve.co.uk Peter Smith Valve Company Limited Occupation Road, Cinderhill Road Bulwell, Nottingham THE PETER SMITH VALVE NG6 8RX COMPANY LTD T: +44 (0)115 927 2831 www.petersmithvalve.co.uk

Heat Exchanger Systems

shared by ObjectiveCreative on Jun 13
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An infographic about heat exchanger systems, which are just one of the typical applications that a Double Block & Bleed valve is used.

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