What is hairpin in heat exchangers?
What is hairpin in heat exchangers?
A hairpin heat exchanger can be described as a single-pass shell-and-tube unit that has been folded in half to give it a hairpin appearance. Hairpin heat exchanger closures allow for a removable tube bundle and accommodate thermal expansion without requiring expansion or packed joints.
What is heat exchanger and its types?
There are three main types of flows in a spiral heat exchanger: Counter-current Flow: Fluids flow in opposite directions. These are used for liquid-liquid, condensing and gas cooling applications. Spiral Flow/Cross Flow: One fluid is in spiral flow and the other in a cross flow.
What is hairpin tube?
Hairpin exchangers are jacketed ‘U’ tube exchangers operating in a true countercurrent flow, allowing also temperature cross (hot fluid outlet temperature is below cold fluid outlet temperature) with a very efficient design.
What are the disadvantages of double pipe heat exchanger?
Disadvantages of Double Pipe Heat Exchangers It does not mean that they cannot be used in parallel flow. They have limitations in heat transfer rather than complicated designs and should be used in low heat duties. Leaking is more often in this type (paired with more units)
Which is better double pipe or shell and tube?
When to use double pipe heat exchanger and shell and tube heat exchanger? Double pipe heat exchangers are used when the heat transfer area is small say up to 14 m2. As the numbers of tubes are more in a shell and tube HE, we can expect a higher turbulence which will result in higher heat transfer rates.
What is spiral tube heat exchanger?
A spiral tube heat exchanger is a coil assembly fitted in a compact shell that optimizes heat transfer efficiency and space. When exotic material is required, a spiral tube heat exchanger minimizes the material used since manifolds replace the channels, heads and tubesheets of a conventional shell and tube design.
Why floating heads are provided in heat exchangers?
A floating head exchanger is used to make removal of the tube bundles possible and to allow for significant expansion of the tubes. At the end of the floating and stationary tubes sheet, exchanger tubes are fixed.