What is hairpins in double pipe heat exchanger?
Sometimes referred to as G-fin, double-pipe or multitube heat exchangers, the hairpin heat exchanger has been used in process industries for many years. 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.
What is the size of a heat exchanger?
Heat exchanger specifications
| Size and weight | Specifications |
|---|---|
| Door size | Depth: 129 mm (5.0 in.) Height: 1950 mm (76.8 in.) Width: 600 mm (23.6 in.) |
| Door assembly weight | Empty: 39 kg (85 lb) Filled: 48 kg (105 lb) |
What is hairpin in heat exchangers?
Hairpin heat exchangers use true counter-current flow. Unlike multi-pass shell and tube designs where correction factors are used to account for inefficiencies resulting from co-current passes, this process maximizes temperature differences between shell- and tube-side fluids.
How does a double pipe heat exchanger work?
A double-pipe heat transfer exchanger consists of one or more pipes placed concentrically inside another pipe of a larger diameter with appropriate fittings to direct the flow from one section to the next. One fluid flows through the inner pipe (tube side), and the other flows through the annular space (annulus).
What is single pass heat exchanger?
Single-pass heat exchangers have fluids that pass each other only once. Multi-pass heat exchangers have fluids that pass each other more than once through the use of U tubes and baffles. Regenerative heat exchangers use the same fluid for heating and cooling.
How do you build a double pipe heat exchanger?
Determine Heat Load Obtain flowrate (W ), inlet, outlet temperatures and fouling factor for both hot and cold stream. Calculate physical properties like density (ρ), viscosity (μ), specific heat (Cp) and thermal conductivity (k) at mean temperature. Determine heat load by energy balances on two streams.
How can you increase the efficiency of a double pipe heat exchanger?
Maximizing the surface area of the wall between the two fluids improves the efficiency of the heat exchanger but as with surface treatments, often results in an increase in pressure drop.
What is number of passes in heat exchanger?
Most shell-and-tube heat exchangers are either 1, 2, or 4 pass designs on the tube side. This refers to the number of times the fluid in the tubes passes through the fluid in the shell. In a single pass heat exchanger, the fluid goes in one end of each tube and out the other.
What is heat exchanger layout?
The heat exchanger design is a thermal heat transfer device that exchanges (hence their name) the thermal energy from one source and transfers it to another at different temperatures. In most heat exchanger design, the fluids or gases used to transfer the heat are separated and do not mix.
What are the disadvantages of double pipe heat exchanger?
Disadvantages of Double Pipe Heat Exchangers
- They are usually used in counterflow designs and can not be used in some applications.
- 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)
What are the dimensions of a hairpin exchanger?
The surface area ranges from (1) square foot to 6,000 square feet (Finned tubes). Pressure capabilities are full vacuum to over 14,000 PSI (limited by size, material, and design condition). Hairpin Exchangers are designed and fabricated per ASME code, and TEMA standards.
Why choose a hairpin heat exchanger?
All hairpin heat exchangers are A.S.M.E. inspected and Code stamped. The most efficient seal on the market. Guaranteed against interstream leakage. Allows for more tubes in a given shell size resulting in more heat exchanger for the same competitive dollar.
What is a double pipe heat exchanger?
Double pipe heat exchangers utilize a single pipe within a pipe design and are commonly used in high fouling service e.g. slurries, with abrasives and smaller duties. Standard shell diameters from 2″ to 6″.
What is the difference between a hairpin and a Lok-flange® closure?
Hairpins are a versatile product with compact designs that are typically more effective than large Shell & Tube designs. Sizes range from 2” O.D. to 40” O.D. shell legs. The LOK-FLANGE® closure uses common through-bolting with independent gaskets and is typically used for design pressures below 1,000 psi.