# What are the criteria in choosing the right heat exchanger?

## What are the criteria in choosing the right heat exchanger?

Considerations when selecting a heat exchanger

Characteristics Plate-and-Frame Shell-and-Tube
Operating Pressure Low High
Use With Particulates Poor Good/Excellent
CIP Ability Excellent Excellent
Materials of Construction Available Good Good

How many Btus are in a 20 plate heat exchanger?

20 Brazed Plate Heat Exchanger, 40,000 BTU.

What is heat exchanger length?

Counter & Parallel Flow Heat Exchanger Tube Length Calculation

Counter & Parallel Flow Heat Exchanger Tube Length Calculation
Overall heat transfer coefficient =
Heat flow rate, Q =
Heat flow rate thru inside tube wall, Qi =
Heat flow rate thru outside tube wall, Qo = Uo*π*do*L*ΔTm

### How do you calculate the heat duty of a heat exchanger?

U = Q / (A x LMTD) Where Q is the heat duty, A is the heat transfer area of the exchanger and LMTD is tem- perature driving force.

How is exchanger duty calculated?

How do you calculate BTU in heat exchanger?

A BTU calculation is performed by placing temperature elements in both the inlet and outlet piping of the heat exchanger. Using the difference of these two temperatures and multiplying by the flow rate, a BTU calculation is obtained.

## How big is a typical heat exchanger?

Tubes may range in diameter from 12.7 mm (0.5 in) to 50.8 mm (2 in), but 19.05 mm (0.75 in) and 25.4 mm (1 in) are the most common sizes.

Which heat exchanger is most efficient?

Each of the three types of heat exchangers (Parallel, Cross and Counter Flow) has advantages and disadvantages. But of the three, the counter flow heat exchanger design is the most efficient when comparing heat transfer rate per unit surface area.

What size water to water heat exchanger do I need?

Many customers ask, “how do you know what size plate exchanger to install in your domestic hot water tank?” A simple rule of thumb is 2 to 3 people in one house will determine a 10 plate. A 10 plate heat exchange is enough for 2 and 3 people.

### What information do I need to size a heat exchanger?

– Calculate thrmophysical properties of hot and cold streams at calorific or average mean temperature. – Perform energy balance and find heat load of the exchanger. – Assume the value of Overall heat transfer coefficient. (Can be approximated based on stream temperature range.) – Decide tentative no. of shell and tube passes.

How to disassemble a plate heat exchanger?

Gasketed plate heat exchangers use high quality gaskets and design to seal plates together and protect against leaks.

• Brazed Plate heat exchangers are used in many industrial and refrigeration applications.
• Welded plate heat exchangers are similar to Gasketed plate heat exchangers,but instead the plates are welded together.
• What size heat exchanger do I Need?

Determine the local climate (+how many days a year you need heating/cooling).

• Total square footage; one of the most important determining factors for sizing a heat pump.
• Windows; how many they are,where are they located?
• Occurrences of air infiltration; where it is and air infiltration quantification.
• ## How to troubleshoot a plate heat exchanger?

– Exercise the isolation valves once or twice a year. – Check strainers and clean as needed. – Check to see that drain ports and vents are not plugged. – Check pressure gauges, change as needed.

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