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How does a condensing economizer work?

Author

Olivia House

Updated on March 08, 2026

How does a condensing economizer work?

The condensing economizer improves waste heat recovery by cooling the flue gas below its dew point, which is about 135°F for products of combustion of natural gas. The economizer reclaims both sensible heat from the flue gas and latent heat by condensing flue gas water vapor (see Table 1).

Consequently, what is the function of the economizer?

Economizers are mechanical devices intended to reduce energy consumption or perform a useful function such as preheating a fluid. In basic terms, an economizer is a heat exchanger.

Also, how does a feedwater economizer work? A feedwater economizer reduces steam boiler fuel requirements by transferring heat from the flue gas to incoming feedwater. Boiler flue gases are often rejected to the stack at temperatures more than 100°F to 150°F higher than the temperature of the generated steam. The stack temperature is measured at 500°F.

Keeping this in view, when can condensing heat recovery be used?

Recovered heat can be used to preheat any process stream Ñ from process water to dryer makeup air Ñ and then existing heating systems can be used to bring the process stream the rest of the way. 7.

What is non-condensing economizer?

Non-condensing economizers

They are heat exchanger coils‚ usually finned‚ that are located in the flue gas ducting at the exit of the boiler. They are designed and operate to maintain the flue gas temperature above the flue gas condensing temperature to prevent corrosion of the flue gas ducting.

What are the two types of economizer?

There are two main types of economizers: non-condensing economizer and condensing economizer.

Why economiser is used in chiller?

An economizer is a type of sub-cooler that uses part of the total refrigerant flow from the condenser to cool the rest of the refrigerant flow (see Figure 10.13). The cold gas from the economizer can also be used to provide extra cooling for the compressor.

How many type of economizers are there?

There are 2 types of economizers: non-condensing and condensing. Economizers are heat exchangers that transfer the heat in the flue gas to another medium‚ generally the boiler feed-water‚ although other streams are sometimes used such as make-up water. There are 2 types of economizers: non-condensing and condensing.

What is the purpose of superheater?

Superheaters and reheaters are specially designed to increase the temperature of the saturated steam and to help control the steam outlet temperature. They are simple single-phase heat exchangers with steam flowing inside and the flue gas passing outside, generally in the cross flow.

What is the main purpose of using an economizer in a boiler?

Explanation: Economizer in boilers is used to heat fluids, upto a certain degree not beyond the boiling point of that fluid. Economizers are named so because they can make use of enthalpy in fluid stream that are hot, thereby making more useful enthalpy and improving the boiler's efficiency. 11.

What is the function of an air preheater?

The purpose of the air preheater is to recover the heat from the boiler flue gas which increases the thermal efficiency of the boiler by reducing the useful heat lost in the flue gas.

What is condensing economizer?

The condensing economizer improves waste heat recovery by cooling the flue gas below its dew point, which is about 135°F for products of combustion of natural gas. The economizer reclaims both sensible heat from the flue gas and latent heat by condensing flue gas water vapor (see Table 1).

What is a stack economizer?

A stack economizer is an exchanger designed to recover the heat contained in the hot flue gases from boilers; the heat is transferred to a hot water system. In the case of a steam boiler, about 20% of the energy required for the burner ends up in the flue, often at high temperatures.

How does an air side economizer work?

An air-side economizer (see Figure 13 below) brings outside air into a building and distributes it to the servers. If the outside air is particularly cold, the economizer may mix it with the exhaust air so its temperature and humidity fall within the desired range for the equipment.

What is the difference between an open and a closed FWH?

Feedwater heaters can also be "open" or "closed" heat exchangers. An open heat exchanger is one in which extracted steam is allowed to mix with the feedwater. Closed feedwater heaters are typically shell and tube heat exchangers where the feedwater passes throughout the tubes and is heated by turbine extraction steam.

Which device is used for increasing the pressure of feed water?

A boiler feedwater pump is a specific type of pump used to pump feedwater into a steam boiler.

Is one of the advantage of reheat cycle?

Advantages: The advantages of using a reheat cycle are higher thermal efficiency, reduced feed water pump power, smaller condenser, smaller boiler, long life of the turbine and less handling of the fuel and firing requirement.

How we can increase the efficiency of Rankine Cycle?

There are three ways to increase the efficiency of the simple ideal Rankine cycle.
  1. Decreasing the condenser pressure. The effect of lowering the condenser pressure on the Rankine cycle efficiency is illustrated on a T-s diagram on the left.
  2. Superheating the steam to a high temperature.
  3. Increasing the boiler pressure.

Where is economiser placed?

Economizers are installed in the exhaust gas flow from the boiler. They take heat from the flue gases which they transfer via extended surface elements to the feedwater immediately prior to the water entering the boiler.

Is used as water feeding equipment in modern power plants?

Boilers are used in power plants to generate steam which is in turn used to generate power. The water supplied to the boiler which is converted into steam is called boiler feed water.

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What happened due to high temperature of its water in the economizer?

What happens due to high temperature of feeds water in the economizer? Explanation: Function of the economizer is to recover a portion of heat of the exhaust gases before the flue gases enter the chimney and discharged to the atmosphere. Due to the high temperature of feed water, fuel consumption reduces.

Is used to heat feed water?

Superheater: A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. While the temperature of the steam in the superheater rises, the pressure remains the same as that of the boiler.

Does a condensing boiler need a water tank?

Advantages of a Condensing Boiler

Space savings: a condensing combi boiler does not need a hot water tank and is available in a wide range of compact sizes, making it much suitable and convenient to fit in a kitchen cupboard than conventional boiler models.

What is the difference between condensing and condensation?

In context|physics|lang=en terms the difference between condensate and condensation. is that condensate is (physics) any of various condensed quantum states while condensation is (physics) the conversion of a gas to a liquid; the condensate so formed.

How do you tell if a boiler is condensing or non-condensing?

When your boiler is condensing, the emissions from the flue will be invisible. If the emissions being produced by your boiler are white, this means that your boiler is not condensing. If you notice any irregularities in the emissions, you should have your condensing boiler looked at.

What are the major advantages of a condensing boiler?

What are the advantages? The main advantage is the boiler's efficiency. Through recycling waste gases back into the system, a condensing boiler can have approximately 90% energy efficiency. This is vastly superior to the efficiency of a traditional boiler which is typically between 70-80%.

How long does a condensing boiler last?

between 10 and 15 years

Which is the most reliable condensing boiler?

Best Condensing Boilers (By Model)
  • #1 Worcester Bosch Greenstar 30i.
  • #2 Viessmann Vitodens 100-W Combi.
  • #3 Vaillant EcoTec Pro.
  • #4 Baxi 600 Combi.
  • #5 Alpha E Tec.

What is a condensing boiler and how does it work?

A condensing boiler uses condensing technology to make better use of the heat it generates. When a fuel such as gas or oil is burned, gasses are released via a flue. In a non-condensing boiler system these gasses would be released into the atmosphere and their heating potential would be lost.

How much more efficient is a condensing oil boiler?

Usually, a new condensing oil-fired boiler will have an efficiency of 92% to 93%, compared with 85% for a new non-condensing boiler and 60% to 70% for older systems. An oil boiler purchased from a well-established company should be just as efficient as a gas powered boiler system, if not more.

Are all new gas boilers condensing?

All new modern boilers are condensing boilers. So if you are thinking of replacing an old boiler with a new one, you will be buying a new condensing boiler and gaining all of the efficiency savings that come with it.

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