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how does a secondary heat exchanger work

by Michele Bashirian Published 3 years ago Updated 2 years ago

In the second heat exchanger, the vapor condenses and turns into a liquid. For this reason, secondary heat exchangers are usually made from materials like stainless steel, coated steel, or fiberglass. Since these materials can withstand moisture, heat, and even acid.

The secondary heat exchanger is where the flue gas undergoes further heat exchange and water vapor forms. After exiting the primary heat exchanger, the burning gas proceeds to the secondary heat exchanger. As water is changed from a vapor to a liquid, it releases more heat into the secondary heat exchanger.

Full Answer

What are the benefits of using a heat exchanger?

Some of the reasons why Gas Heat Exchangers are suitable for use in heat recovery systems are:

  • They use individual solution for low volume heat installation condition
  • Has low loss of pressure
  • The fuel used in the system has a lower heating value
  • It is highly effective
  • Easy maintenance
  • The boiler is efficient
  • Self-cleaning effect
  • They have a recuperator system
  • Has an optimized fluid flow coupled with heat transfer design
  • Low fouling

What type of heat exchanger is more efficient?

  • When the amount of fluids are more we will use plate n frame heat exchanger .
  • When required heat transfer cofficient is more then double pipe heat exchanger is efficient .
  • When amount f fluids are huge and temperature difference required is more and pressures and temparatures are more we will go for shell and tube heat exchanger .

More items...

Should I replace heat exchanger?

  • Your energy bills are creeping up
  • Your furnace repairs have increased over the past couple of years
  • Your burner flame is yellow (it should be blue)
  • It is making strange noises
  • The blower is running all the time or turning on and off frequently
  • You or your family have been getting sick more often
  • Your house is more dusty than usual

How to install a heat exchanger?

Plate Heat Exchanger Installation and Assembly. The Hot Water Side of the Plate Heat Exchanger. This is your hot water side. So you're going to mount your plate heat exchanger on the cold water side, and we'll explain to you why. It's actually quite simple, we call it a thermal pressure siphon. We will explain in detail in a minute.

How do I know if my secondary heat exchanger is clogged?

A Pungent Odor Run the furnace and check the exhaust there. If the odor is strong – the exhaust might also be hazy or smoky rather than clear – this is a good indication that the heat exchanger has become blocked or clogged with soot or with pieces of the lining, a problem explained in the next section.

Can a secondary heat exchanger be cleaned?

The secondary heat exchanger or “reheat coil” is almost always located directly above the blower making them prone to collecting more dust and debris than air conditioning coils. This is why it is imperative to access, inspect and clean these coils in order to properly clean the system.

What causes clogged secondary heat exchanger?

0:376:50How to Clean a Clogged Secondary Heat Exchanger with WaterYouTubeStart of suggested clipEnd of suggested clipSo what's happening is the heat exchanger got clogged up because of the lack of enough oxygen you'reMoreSo what's happening is the heat exchanger got clogged up because of the lack of enough oxygen you're running too rich. And this furnace the exhaust was starting to get stinky. And that's the clue that

Do all furnaces have a secondary heat exchanger?

Primary and Secondary Heat Exchangers All gas furnaces have a primary heat exchanger. High-efficiency furnaces have a secondary heat exchanger as well. This allows them to extract more heat from the flue gas than just a primary heat exchanger can. High-efficiency furnaces are those rated as 90% efficiency or more.

How much does it cost to replace a secondary heat exchanger?

$1,000 to $2,000Replacing a secondary heat exchanger costs $1,000 to $2,000, depending on the brand, material, and furnace capacity. The secondary heat exchanger part alone costs $300 to $800. Some high-efficiency models use a secondary heat exchanger to reclaim the heat from the combustion gasses that normally vent to the outside.

What is the difference between primary and secondary heat exchanger?

The primary heat exchanger is the area that has the hottest flue gas and it is located near the burner. If you have a high- efficiency furnace (90%+) then you also have a secondary heat exchanger. The secondary heat exchanger is where the flue gas undergoes further heat exchange and water vapor forms.

How do you inspect a secondary heat exchanger?

0:152:21Simple Furnace Heat Exchanger Test | Lennox Learning SolutionsYouTubeStart of suggested clipEnd of suggested clipAnd easiest ways to test them while it's true we can disassemble the heat exchanger take theMoreAnd easiest ways to test them while it's true we can disassemble the heat exchanger take the manifold. The burners out and do a visual inspection.

What are the symptoms of a damaged heat exchanger?

Warning Signs of Cracked Heat ExchangersVisible Damage. You may be able to see cracks in the heat exchanger when you visually inspect the furnace. ... Soot. The presence of soot on the heat exchanger or on the furnace's interiors is a warning sign of incomplete combustion. ... Abnormal Flame. ... Noticeable Odors. ... Water on the Floor.

What happens when heat exchanger fails?

The problem is that all heat exchangers will eventually fail, developing holes or cracks that allow those poisonous gases to leak out and contaminate your home's air. These leaks can be extremely dangerous, even deadly. In fact, cracked heat exchangers are one of the major causes of carbon monoxide poisoning in homes.

Can you run a furnace with a cracked heat exchanger?

Rule #1: If your Heat Exchanger has been deemed cracked by a HVAC professional you should NOT be running it. Unfortunately, some owners will attempt to run their furnace even when a cracked heat exchanger has been detected.

Is it worth replacing furnace heat exchanger?

You can't repair or replace a heat exchanger because there's too big a risk of carbon monoxide leaking into your home. It's also cost-prohibitive. That's why you need to replace the entire furnace.

How long does a heat exchanger last?

15 to 25 yearsIn the past, heat exchangers were often built with heavy metals, such as cast iron. These exchangers can last as long as 30 or 40 years, much longer than the steel exchangers most manufacturers build today. Modern stainless or aluminized steel heat exchangers typically have a life span of 15 to 25 years.

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