# What is pitch in shell and tube heat exchanger?

## What is pitch in shell and tube heat exchanger?

The distance between the centers of the tube hole is called the tube pitch; normally the tube pitch is 1.25 times the outside diameter of the tubes. Other tube pitches are frequently used to reduce the shell side pressure drop and to control the velocity of the shell side fluid as it flows across the tube bundle.

## Which pitch is better for heat exchanger?

Triangular pitch (30o layout) is better for heat transfer and surface area per unit length (greatest tube density.) Square pitch (45 & 90 layouts) is needed for mechanical cleaning.

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What does Square pitch mean?

The most common design is that which is referred to as “square pitch”. The square pitch propeller has a pitch ratio of 1:1 which means for each rotation fluid is moved forward by an amount equal to its diameter.

What is a baffle pitch?

Baffles serve three functions: 1) support the tube; 2) maintain the tube spacing; and 3) direct the flow of fluid in the desired pattern through the shell side. The baffle pitch and the baffle cut determine the cross flow velocity and hence the rate of heat transfer and the pressure drop.

### How do you calculate pitch in shell and tube heat exchanger?

TEMA standards recommends a minimum tube pitch of 1.25 * Tube outer diameter for triangular pitch. For example, if we have a tube outer diameter of 12.7 mm (0.5 inch) then the recommended tube pitch for triangular pitch arrangement is: 1.25 * 12.7 mm = 16 mm (0.6 inch).

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### How do you calculate heat exchanger pitch?

What is difference between triangular pitch and square pitch?

The square pitch enables regular & mechanical scraping/cleaning of the tube surface. Triangular pitches are more efficient i. e., accommodate more tubes. Thus they are the preferred tube arrangement wherever possible.

How do you calculate tube pitch in heat exchanger?

#### Should I replace heat exchanger?

There are only two options if a Heat Exchanger is bad: Replace the heat exchanger or replace the furnace. If the heat exchanger is under warranty, this option is a good way to go unless it is unavailable in the time frame needed, which can be immediate in cold weather.

Which type of heat exchanger is more efficient?

A shell and tube heat exchanger is more efficient as it can have multiple passes for the fluid to stay longer in contact with heating material (fluid in this case). Longer contact time and higher heat exchange surface area allows greater heat transfer rates which is in accordance with Nusselt ’s equation.

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Why to use heat exchangers?

Several benefits of using heat exchangers are listed below: Energy efficiency improvements of plant systems Reduction of fuel usage, GHGs, and emissions Replace existing equipment due to wear and tear Upgrade existing equipment to newer more efficient designs Additional heating or cooling capacity due to increase in plant output

## What exactly does a heat exchanger do?

A heat exchanger is a device designed to efficiently transfer or “exchange” heat from one matter to another. When a fluid is used to transfer heat, the fluid could be a liquid, such as water or oil, or could be moving air. The most well known type of heat exchanger is a car radiator.