How do you design a shell and tube type heat exchanger?

Steps for heat exchanger design procedure

1. Define the essential process requirements.
2. Select suitable type of heat exchanger.
3. Fix some of the design parameters to create a heat exchanger model.
4. Rating of the heat exchanger design.
5. Create specification sheet with finalized heat exchanger design.

What is Kern method?

methods is the well-known Kern method, which was an attempt to correlate data. for standard exchangers by a simple equation analogous to equations for flow in. tubes. However, this method is restricted to a fixed baffle cut (25%) and cannot. adequately account for baffle-to-shell and tube-to-baffle leakages.

What is heat exchanger design?

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.

How is shell and tube heat exchanger area calculated?

The main basic Heat Exchanger equation is:

1. Q = U x A x ΔTm = The log mean temperature difference ΔTm is:
2. ΔTm = (T1 – t2) – (T2 – t1)
3. = °F. Where:
4. T1 = Inlet tube side fluid temperature; t2 = Outlet shell side fluid temperature;
5. ln (T1 – t2) (T2 – t1)

What is Shell tube heat exchanger PDF?

A Heat exchanger is a device to transfer heat from one fluid (Liquid/Gas) to another. There are various types of heat exchangers used in process piping. Shell and tube heat exchanger is the most widely used heat exchanger and are among the most effective means of heat exchange.

What is heat exchanger PDF?

A heat exchanger is a heat transfer device that exchanges heat between two or more process fluids. Heat exchangers have widespread industrial and domestic applications.

What is NTU method for heat exchanger?

The Number of Transfer Units (NTU) Method is used to calculate the rate of heat transfer in heat exchangers (especially counter current exchangers) when there is insufficient information to calculate the Log-Mean Temperature Difference (LMTD).

What is triangular pitch?

The triangular pitch provides a more compact arrangement, usually resulting in smaller shell, and the strongest header sheet for a specified shell-side flow area. It is preferred when the operating pressure difference between the two fluids is large.

What are the factors are involved in designing a heat exchangers?

Designing heat exchanger The main factors affecting the performance heat exchanger tubes include: fluid velocity, tube diameter, converter tube shape (U or cross shape), converter layout order (horizontal or vertical), and Venting valve, material of tube sheet and channel and location order of input channel.

How do you create a heat exchanger?

For the sizing problem:

1. Calculate the effectiveness.
2. Calculate the capacity rate ratio.
3. Calculate the overall heat transfer coefficient.
4. Determine NTU.
5. Calculate the heat transfer surface area.
6. Calculate the length of the tube or heat exchanger.

How many shell and tube passes are there in this design for shell and tube heat exchanger?

They are used to boil water recycled from a surface condenser into steam to drive a turbine to produce power. Most shell-and-tube heat exchangers are either 1, 2, or 4 pass designs on the tube side.

How does a shell and tube heat exchanger work?

As its name implies, this type of heat exchanger consists of a shell (a large pressure vessel) with a bundle of tubes inside it. One fluid runs through the tubes, and another fluid flows over the tubes (through the shell) to transfer heat between the two fluids.

How is NTU calculated?

NTU method formula:

1. R (specific heat ratio) = CminCmax.
2. And, NTU = UACmin.
3. Where, R = CminCmax.
4. and, NTU = CUACmin.
5. ∴ R = CminCmax=Cmin∞ C min C max = C min ∞ =0.
6. ∴R=CminCmax=1.
7. ∴ɛ=QactualQmax.
8. R = CminCmax C min C max =62500189000 = 0.3306.

What is the difference between LMTD and NTU method?

The LMTD method is convenient for determining the overall heat transfer coefficient based on the measured inlet and outlet fluid temperatures. The ε-NTU method is more convenient for prediction of the outlet fluid temperatures if the heat transfer coefficient and the inlet temperatures are known.

What is the fouling factor?

The fouling factor represents the theoretical resistance to heat flow due to the buildup of a fouling layer on the tube surfaces of the heat exchanger. In practice, fouling factors are often overstated by the end user in an attempt to minimize the frequency of cleaning.

What is baffle in heat exchanger?

Baffles are flow-directing or obstructing vanes or panels used to direct a flow of liquid or gas. It is used in some household stoves and in some industrial process vessels (tanks), such as shell and tube heat exchangers, chemical reactors, and static mixers.

What is design and selection criteria for heat exchanger?

Main Criteria for Heat Exchanger Sizing and Selection For a gasketed plate heat exchanger, the gaskets must be compatible with the fluids in the unit. Thermal fluid characteristics and product mix. If the heating or cooling fluid is susceptible to fouling, a corrosion resistant material may be needed. Location.

Which two standards are generally used for heat exchanger design?

The two most commonly used are the ε-NTU and LMTD methods. In this section a PSR recuperator of the plate type is discussed using the ε-NTU method.