keeps the two fluids completely separated only the thermal energy will flow through the sheets the entire unit is held together with some long bolts which compress the gaskets to form a very tight seal these heat exchangers are very common for heating and cooling for example an incinerator power plant burns household waste to generate heat this creates steam which drives a turbine and generates electricity the waste thermal energy then passes through a plate heat exchanger to heat a district heating network and other buildings will then connect to this heat network also via a plate heat exchanger to supply their own heating demands this will be instead of them operating their own individual boiler spiral heat exchangers look something like this we have a flange inlet on the front face with the outlet located on the top then we have an inlet from another fluid also on the top with the outlet located on the rear face behind the end plates we find two sheets of metal inside which spiral together around the interior to form a channel which the fluids will now flow through the channel completely separates the two fluids we see the first fluid enters the heat exchanger and fills the chamber then flows around the channel and to the outlet meanwhile on the other side the second fluid is entering via the top flowing around the channel and into the chamber where it then exits the two fluids enter and exit at different temperatures this type of heat exchanger isn't as commonly used however because the design has only one channel for the fluid to flow through the velocity remains high making it harder for fouling to occur whereas plate and even tube heat exchangers divide the flow into multiple paths so these are ideal for installations where sludge like substances are processed for example in an anaerobic digester where the thick sludge is recirculated through a spiral heat exchanger to maintain a certain temperature this releases methane from the digester to power an engine and then turn an electrical generator check out one of these videos to continue learning about mechanical and thermal engineering as this is the end of the video don't forget to follow us on facebook linkedin twitter instagram tick tock as well as the engineering mindset dot com
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