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A What Exchanger? A heat exchanger is a type of equipment built to transfer heat between mediums. The air being transferred might never mix with the mediums. This could be because of a separation of solid walls. There are two types of flow in a heat exchanger; parallel flow heat and counter flow heat. Parallel has two fluids that enter the exchanger at the same end, and travel parallel tunneling to the other side. Counter is the opposite. The fluids enter at opposite ends and exchanges that way. Is one better than the other? Yes. Counter currents are more efficient, this transfers more heat from the heat transfer mediums. Who can use this? There are many different kinds of heat exchangers and all are used in a variety of places. Shell and tube, plate, adiabatic wheel, plate fin, pillow plate, fluid, etc. can all be found in hospitals, schools, universities and factories. A lot of large buildings that need to be heated in the winters can find great uses for these types of exchangers. Maintenance and Monitoring They are able to find out if the exchanger is doing its job by using math! They calculate the overall heat transfer coefficient from flow rates and temps by using a formula. This is how the user will be informed if cleaning is in order. There is also something called fouling. This can be as gross as it sounds. Impurities start to deposit because of low fluids, high fluids low wall shear stress, etc. But most of these issues can be solved by dissembling and cleaning periodically. Heat exchangers are amazing and efficient ways that we are able to warm or schools and hospitals. Never thought it was so complicated to be cozy and warm huh?
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