# Calculating Boiler Radiation Loss from Chimney Gas Analysis

• TSN79
In summary, the conversation discusses analyzing the chimney gas from a 70 kW boiler burning pellets. The temperature was found to be 140C, with a CO2 value of 8% and a room temperature of 22C. The use of Siegert's formula yielded a chimney loss of 11.8, with a constant of 0.8 used for pellets. It is mentioned that an upper bound on the heat radiated by the boiler can be calculated if the temperature inside the boiler is known, and that the fraction of this radiation that contributes to a loss depends on the construction of the boiler.
TSN79
I analyzed the chimney gas from a 70 kWboiler burning pellets. I found the temperature to be 140C, the CO2 value was 8%, and the room temp was 22C. Is it possible from this to calculate the boilers radiation loss? If not, what other information do I need? I used Siegert's formula to find the chimney loss by $$0,8\frac{140-22}{8}=11,8$$ where 0,8 is a constant used for pellets.

You can actually calculate an upper bound on the heat radiated by the boiler if you knew the temperature in the boiler. Not all of this radiation will contribute to a loss, and that fraction will depend on the construction (materials and geometry) of the boiler.

It is possible to calculate the boiler's radiation loss using the information provided, but it may not be accurate. In order to get a more precise calculation, you would need additional information such as the boiler's surface area and emissivity, as well as the boiler's operating conditions (e.g. fuel feed rate, air flow rate, etc.).

Additionally, Siegert's formula is typically used for calculating heat loss through the chimney due to exhaust gas temperature difference. It does not take into account the radiation loss from the boiler itself. To calculate the radiation loss from the boiler, you would need to use a different formula that takes into account the boiler's surface area and emissivity.

In summary, while it is possible to estimate the boiler's radiation loss using the provided information, a more accurate calculation would require additional data and a different formula.

## 1. What is the purpose of calculating boiler radiation loss from chimney gas analysis?

The purpose of calculating boiler radiation loss from chimney gas analysis is to determine the amount of heat that is lost through the chimney of a boiler. This information can then be used to improve the efficiency of the boiler and reduce energy costs.

## 2. How is boiler radiation loss calculated from chimney gas analysis?

Boiler radiation loss is calculated by analyzing the composition of the flue gas leaving the chimney. This includes measuring the temperature, oxygen, and carbon dioxide levels in the gas. These values are then used in a formula to calculate the amount of heat lost through radiation.

## 3. What factors can affect the accuracy of boiler radiation loss calculations?

There are several factors that can affect the accuracy of boiler radiation loss calculations, including variations in fuel quality, changes in operating conditions, and measurement errors. It is important to regularly monitor and adjust these factors to ensure accurate calculations.

## 4. How can boiler radiation loss be reduced?

There are several ways to reduce boiler radiation loss, including insulating the boiler and chimney, optimizing combustion efficiency, and using a heat recovery system. Regular maintenance and tuning of the boiler can also help to minimize radiation loss.

## 5. What are the benefits of reducing boiler radiation loss?

Reducing boiler radiation loss can lead to significant cost savings by improving the energy efficiency of the boiler. It can also help to reduce emissions and improve the overall environmental impact of the boiler. Additionally, minimizing radiation loss can extend the lifespan of the boiler and reduce the need for repairs or replacements.

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