Questions

What makes a good heat exchanger?

What makes a good heat exchanger?

The heat from one fluid passes across the metal (which is thermally conductive) into the other fluid without the fluids making contact. High fluid velocity, high turbulence, high surface area and a large temperature differential all contribute to more efficient heat transfer.

How do you determine effectiveness of heat exchanger?

With the use of baffles, the shell-side fluid stream is re-routed and made to flow back-and-forth over the tubes. The effectiveness (ϵ) of a heat exchanger is defined as the ratio of the actual heat transfer to the maximum possible heat transfer. Qmax is the minimum of these two values i. e.

How do you know if heat exchanger is bad?

Six Signs Your Furnace Heat Exchanger May be Cracked

  1. Strange smells. A malfunctioning heat exchanger will often create an unpleasant and strong odor that smells similar to formaldehyde.
  2. Soot Build-up.
  3. Corrosion & Cracks.
  4. Change in the flame appearance.
  5. Audible Sounds.
  6. Presence of Carbon Monoxide.
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What are 3 factors that would affect the heat transfer capacity of a heat exchanger?

Factors that affect rate of heat flow include the conductivity of the material, temperature difference across the material, thickness of the material, and area of the material.

What are the symptoms of a bad heat exchanger?

Six Signs Your Furnace Heat Exchanger May be Cracked

  • Strange smells. A malfunctioning heat exchanger will often create an unpleasant and strong odor that smells similar to formaldehyde.
  • Soot Build-up.
  • Corrosion & Cracks.
  • Change in the flame appearance.
  • Audible Sounds.
  • Presence of Carbon Monoxide.

What causes pressure drop on shell side of tube exchanger?

Pressure drop on shell side. It is very common to use baffles in the shell side of shell and tube exchanger. They cause the shell side fluid to go across the tubes. This causes ‘cross flow’ conditions and promotes the overall heat transfer.

How to calculate overall heat transfer coefficient for a shell exchanger?

We can use the following equation to get the overall heat transfer coefficient for a shell & tube exchanger. Note, this overall heat transfer coefficient is calculated based on the outer tube surface area (Ao). So it must be multiplied by the Ao value for using in the overall heat transfer equation.

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What are the characteristics of shell-and-tubes heat exchangers?

The exchangers exhibit more than 65\% of the market share with a variety of design experiences of about 100 years. Shell-and tube heat exchangers provide typically the surface area density ranging from 50 to 500 m 2/m 3 and are easily cleaned.

Is there a shell & tube heat exchanger sizing calculator?

Here’s a shell & tube heat exchanger sizing calculator to help you calculate the required heat transfer area based on inlet/outlet temperature values on shell and tube sides. This calculator is for sizing the tubeside flow based on a fixed shell side flow.