What is Heat Exchanger in HVAC?

Posted: June 10, 2022

What is a heat exchanger?

The heat exchanger is a component that converts heat from one medium to another. It accords to the second law of thermodynamics. The heat exchanger is used in heating and cooling systems to control the temperature of the enclosed space. Tubes, tube sheets, shells, and baffles are the internal parts of the heat exchanger. 

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To understand the work of heat exchangers, we need to know about conduction, convection, and radiation.

  • Conduction:

Conduction means passing thermal or electrical energy between materials that are connected to each other. Energy transfers low-level temperature to a high level. 

  • Convection: 

Convection means the transfer of energy within a fluid by an inclination towards a type of behavior.

  • Radiation:

Radiation is the emission of energy by electromagnetic that comes from space at light speed. Conduction and convection both require an intermediate medium, but radiation does not require any intermediate medium. 

Types of heat exchangers

You can find heat exchangers of different sizes and shapes. Every type of  Heat Exchanger has its own advantages and disadvantages.

You can categorize heat exchangers on the following basis.

Categorize based on construction style:

  1. Recuperative vs regenerative
  2. Direct vs indirect
  3. Static vs. dynamic
  4. Types of components and materials employed

Categorize based on flow structure:

  1. Co-current flow
  2. Countercurrent flow
  3. Crossflow
  4. Hybrid flow

Categorize based on heat transferring method:

  1. Single-phase heat exchanger
  2. Two-phase heat exchanger

Troubleshooting common problems in a heat exchanger

  1. Insufficient heat:

The dirty heat transfer surface resists carbonaceous material. You can find insufficient heat reasons for TAN, viscosity, solids, and GCD fluid analysis. 

    2. Low fluid flow:

Low fluid flow problem occurs because of partially plugged lines, filters, and pump-related problems. Check the pressure across the pipe and complete the equipment section to find out the blockages.  

    3. Low fluid temperature: 

Build up fouling on tubes or heat source's electrical element. Reduced gas firing or reduced fluid residence time are the causes of low fluid temperature. 

    4. Incorrect material:

Cheaper material or improper material can create problems in the heat exchanger work efficiency. Use correct material. Check manufacturer manual for material quality. PartsHnC provides the best quality material products at an affordable price range from the best manufacturer. And we have legal distributors of top manufacturers.

    5. Thermal degradation:

Using thermally suitable fluid either causes thermal degradation. Thermal stability is important for heat transfer.  

    6. Insufficient capacity:

Insufficient capacity products save money. But at the run time they get high load and they are damaged. Check how much capacity is needed for your system and buy sufficient capacity products from PartsHnC. It is the right option to buy any heating, ventilation, and air conditioning systems.

    7. Damaged products:

Sometimes, the best quality products are also damaged because of bad handling and improper maintenance. Handle every product smoothly, clean properly and maintain products under professionals' guidance.  


Leakage problems may occur because of poor service, incorrect gasket, and corrosion. 

  • You need to clean heat exchangers yearly once with the help of service technicians. 
  • The heat exchanger contains gasket/O-rings. The gasket is used to resist high temperatures. So, use the correct gasket with quality rubber. Before using the gasket, check the product name and label for easy identification. Also, check the instruction manual before using it. Place the gasket in the correct place without leakage. 
  • Corrosion is not a common issue. Salted food or other products react with stainless steel at high temperatures and high concentrations. If you are using salty products, then must buy an alloy of stainless steel. Because alloy of stainless steel contains a large amount of molybdenum and it is recommended for salty products.

    9. Contamination:

Ask experts which detergent or cleaning solution is compatible with the heat exchanger. An incorrect cleaning regime causes contamination. Clean 

regularly according to manufacturer instructions or take the help of professional service providers. Incorrect cleaning creates many problems.

    10. Pressure:

Pressure drop increases because of many reasons. Take guidance from your product manufacturer.

    11.  Lack of safety and backup:

When your heat exchanger goes suddenly too hot or too cool, it is a sign of damage to your product. In these kinds of situations, safety and backup are very important. Check all safety and backup specifications before buying products. PartsHnC provides you with detailed information about all safety and backup feature information about the products. Visit our website https://www.partshnc.com/ for more knowledge. Contact us at [email protected], or call on (866) 963-0907 for technical and purchase-related queries. 

Buy a suitable heat exchanger for your system from the below list:

  1. Heat Exchanger For Lennox Part

Manufacturer Name: Lennox Parts And Supplies

Product Number: 58W74

OEM Part Number: 58W74

Product Description: Heat Exchanger For Lennox Part #58W74

Click the URL to buy: https://www.partshnc.com/heat-exchanger-50  

Similar Products: 93L35, 99M83, 99W42, 99W43.

     2. Heat Exchanger For Lennox Part

Manufacturer Name: Lennox Parts And Supplies

Product Number: 60G78

OEM Part Number: 60G78

Product Description: Heat Exchanger For Lennox Part #60G78

Click the URL to buy: https://www.partshnc.com/heat-exchanger-49  

Similar Products: EXC1212, EXC1300, EXC1309, EXC1321.

     3. Heat Exchanger For Trane Part

Manufacturer Name: Trane

Product Number: EXC1362

OEM Part Number: EXC1362

Product Description: Heat Exchanger For Trane Part #EXC1362

Click the URL to buy: https://www.partshnc.com/heat-exchanger-212  

Similar Products: EXC1300, EXC1368, EXC1378, 60G79.

     4. Heat Exchanger For Lennox Part

Manufacturer Name: Lennox Parts And Supplies

Product Number: 85L50

OEM Part Number: 85L50

Product Description: Heat Exchanger For Lennox Part #85L50

Click the URL to buy: https://www.partshnc.com/heat-exchanger-44  

Similar Products: EXC1388, EXC1390, EXC1857, SKU EXC1872.

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