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Tag Archive Biomass Boiler Efficiency Calculation for sale

Biomass Boiler Efficiency Calculation

What is Boiler Efficiency?
When it comes to boiler efficiency, it is an important term which should be considered. Boiler efficiency is a combined result of efficiency of different components of a boiler. A boiler has many sub systems whose efficiency affects the overall boiler efficiency. Couple of efficiency which finally decide the boiler efficiency are-
1. Combustion efficiency
2. Thermal efficiency
Apart from these efficiency, there are some other losses which also play a role while deciding the boiler efficiency and hence need to be considered while calculating the boiler efficiency. However, the most important factors need to be considered are boiler combustion efficiency and boiler thermal efficiency.

Biomass Boiler Efficiency Calculation

Biomass Boiler Efficiency Calculation

Biomass Boiler Efficiency
The following formulae can be used to estimate the thermal efficiency of modern biomass boilers. The estimate required for the standing losses should be made after inspection where possible. If the outside of the boiler and combustion chamber are mildly warm to the touch then the standing losses would be around 1.5% MCR(boiler rated output). If they are hot but would not burn you, then we suggest that you allow 3% MCR, otherwise 6% would be a reasonable figure.

fgl = 0.74 * CO2 / (Tf – Ta) eff = 100 – fgl – sl

where :-
fgl = flue gas loss
CO2 = %CO2 in the dry flue gas
Tf = flue gas temperature at the boiler outlet in deg C
Ta = ambient air temperature in the boiler house in deg C
eff = estimated thermal efficiency of the boiler
sl = estimated standing losses
The calculations give values based on the net calorific value of the fuel and not the gross CV as normally given for gas.The flue gas loss formula is based on average carbon, hydrogen, and oxygen contents published in the trade literature and on the Internet for dry ash free samples. However, as the content of the elements can vary from one species to another the answers must be considered as estimates and not facts. The efficiency calculation will show how effective the transfer of heat energy from the combustion process of fuel into the air.
However, the efficiency calculation is not very accurate, because it does not account for the loss of heat radiation and convection that are not absorbed by water. In addition, the calculation of the thermal efficiency of the boiler cannot be used for economic analysis, because these calculation doesn’t take notice carefully the amount of fuel consumed.