How do I know what size heat exchanger I need?

ΔTm =

1. ΔTm =
2. = 94.9 °F. 0.10536.
3. The preliminary area estimate of the heat exchanger can now be calculated as: A = Q / (U x ΔTm) =
4. A = 2, 035, 000 Btu/hr.
5. = 178.7 ft² (120 Btu/h.ft².°F).(94.9°F)
6. The required mass flow rate of water can be calculated from Q = m.Cp. ΔTm: Rearranging:
7. m = Q…… = Cp x ΔTm.
8. m = (2,035,000 Btu/hr)

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.

What is heat transfer area in heat exchanger?

The heat transfer area for a (two-stream) heat exchanger is calculated using a single variable for temperature difference. However, in a heat exchanger there is a range of temperature differences between the hot and the cold stream, over the device surface.

How do you size a heat exchanger plate?

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.

How is UA calculated?

That is, UA = 954 BTU/hr-F, where U is the conductance of the building and A is the surface area of the building. When the average outside temperature is greater than 56.5 degrees F, the building heating system is not activated….

What is the most efficient heat exchanger design?

Plate exchanger is the most efficient due to turbulent flow on both sides. High heat-transfer coefficient and high turbulence due to even flow distribution are important. However, a plate heat exchanger regenerator is restricted to low viscosities.

What are different types of heat exchangers?

Contents

• 2.1 Shell and tube heat exchanger.
• 2.2 Plate heat exchangers.
• 2.3 Plate and shell heat exchanger.
• 2.4 Adiabatic wheel heat exchanger.
• 2.5 Plate fin heat exchanger.
• 2.6 Finned tube heat exchanger.
• 2.7 Pillow plate heat exchanger.
• 2.8 Waste heat recovery units.

How do you calculate heat transfer area of a plate heat exchanger?

Calculation method

1. Heat load, Theta and LMTD calculation. Where: P = heat load (btu/h) m = mass flow rate (lb/h)
2. Heat transfer coefficient and design margin. The total overall heat transfer coefficient k is defined as: α1 = The heat transfer coefficient between the warm medium and the heat transfer surface (btu/ft2 h °F)

How does a heat exchanger work?

The basic component of a heat exchanger can be viewed as a tube with one fluid running through it and another fluid flowing by on the outside. There are thus three heat transfer operations that need to be described: Convective heat transfer from fluid to the inner wall of the tube, Conductive heat transfer through the tube wall, and

How many different kinds of heat exchangers are there?

There are three common kinds of heat exchangers. They can all be effective in a variety of heat transfer applications, but optimizing efficiency, cost and space depends heavily on the particular process in which the heat exchanger is installed.

How to monitor the performance of commercial heat exchangers?

Online monitoring of commercial heat exchangers is done by tracking the overall heat transfer coefficient, because the overall heat transfer coefficient tends to decline over time due to fouling.

What is the efficiency of a shell and tube heat exchanger?

The shell and tube heat exchanger in the photo above has about twelve times the efficiency than a hypothetical single-tube heat exchanger of the same size. However, there is a disadvantage to smaller tubes – if the fluid in your application is very viscous or has particulates, it can foul up the tube and undermine the heat transfer process.