What are the two parts of a high efficiency furnace heat exchanger?

If you have a furnace that is considered high-efficiency (90%+ efficient), it contains both a primary and secondary heat exchanger. As the combustion exhaust leaves the primary heat exchanger, it travels into a secondary heat exchanger where more heat is released from the flue gas and water vapor begins to form.

What are the main components of a furnace?

The main parts of your furnace are the control system (thermostat and electrical controls), gas valve, burners, heat exchanger, blower, and duct and ventilation system. When your furnace creates heat, combustion gases are vented out of your home via a flue pipe.

Is the heat exchanger part of the furnace?

Every furnace contains a heat exchanger. It’s an essential part of the heating process. To create heat, your furnace combusts fuel—typically gas, but other varieties exist—in a sealed chamber. This combustion process generates heat energy from the fuel source.

What are main factors that determine the efficiency of a furnace?

5 Factors that Affect Your Furnace’s Efficiency Levels

5 things that can affect your furnace’s efficiency levels.
Maintenance history. The better a furnace is maintained, the more efficiently it will operate.
Condition of your air filter.
Thermostat settings.
Insulation levels.
Duct/air leaks.

Are all new furnaces High efficiency?

In this type of furnace, 20% of the energy produced by natural gas is expelled as exhaust. High efficiency furnaces offer 90% or more AFUE. These days, 95% AFUE is a common rating among new gas-powered furnaces. So a 95% furnace is more efficient than an 80% furnace.

Why do gas furnace efficiencies jump from 80 percent to 90 percent?

Why do gas furnace efficiencies jump from 80% to 90%? Efficiencies over 80% cause condensation but the flue gas is still too hot for PVC vent pipe until the efficiency reaches 90%.

Is the blower part of the furnace?

The blower is one of the most appropriately named components in your furnace: its sole job is to blow hot air through the ducts and into your home.

What is the third component in the furnace called?

Forced draft. The third category of furnace is the forced draft, mid-efficiency furnace with a steel heat exchanger and multi-speed blower.

What are the symptoms of a damaged 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 are four factors that determine the efficiency of a furnace?

What are four factors that determine the efficiency of a furnace? Factors that determine the efficiency of a furnace are the type pf draft, the amount of excess air, the temperature difference of the air or water entering versus leaving the heating medium side of the heat exchanger, and the flue stack temperature.

What is HVAC efficiency?

HVAC efficiency allows people to use their HVAC equipment to cool or heat buildings without wasting energy unnecessarily.

Where is the heat exchanger on a high efficiency furnace?

High efficiency furnaces, unlike standard efficiency models, have a secondary heat exchanger . This heat exchanger, similar to a car radiator in appearance, is located in the furnace before the primary (or main) heat exchanger . It is located just above the blower housing (in upflow models)…

What is the efficiency of a high efficiency furnace?

However, these combustion gases contain residual heat that is lost through the ventilation. You can capture that heat with a high efficiency condensing furnace. A high efficiency condensing furnace can achieve efficiency ratings of 90 or above. It uses a venting system to extract that heat before venting.

Can a high efficiency furnace be vented through a chimney?

For these reasons, exhaust from a condensing furnace should never be vented through a standard chimney. High efficiency furnace venting uses two heat exchangers. (Conventional furnaces use only one.) They use a two-stage process. In the first stage, gas is burned to heat the first heat exchanger.

How do the parts of a furnace work?

Here’s how the parts of a furnace work together to deliver your heat in a gas system: The pilot light or ignition system lights the burners within the combustion chamber. The burners burn fuel to create heat. Heat enters the heat exchanger, where it transfers to air, bringing it up to the temperature set by your thermostat.

Why is a high efficiency furnace called a condensing furnace?

High-efficiency furnaces are often known as condensing furnaces because they have a second heat exchanger that extracts additional heat from the air that passes through the first heat exchanger. This heat-extraction processes caused water vapor to condense out of the air, which is drained away through a tube that is usually placed in a floor drain.

Are there any problems with a high efficiency furnace?

But there are other issues as well. Here are the most common high efficiency furnace problems that I have encountered: Plugged condensate drains.

Is the blower compartment of a high efficiency furnace insulated?

Blower compartments on high-efficiency furnaces are usually insulated to retain heat. Conventional furnaces usually are not insulated. Condensing furnaces are similar to conventional furnaces when it comes to fuel combustion—the standard components include a gas burner, electronic ignition, and a combustion chamber.