Table of Contents
What is the reason behind higher efficiency of most modern boilers?
With condensing boilers now the norm, the most efficient heating systems are designed for a higher temperature drop so that the return water is a lower temperature, which offers greater condensation opportunities and, therefore, higher boiler efficiencies.
What is LHV efficiency?
The lower heating value (LHV) or higher heating value (HHV) of a gas is an important consideration when selecting a gas engine or CHP plant. Gas engines efficiency is typically quoted based upon the LHV of the gas. Whenever a hydrocarbon fuel is burned one product of combustion is water.
Is a higher LHV better?
In my opinion, it is better to use the LHV resulting in a more accurate value of the real energy that the fuel will release and the quantity of fuel you will require to supply and energy demand. The heating value of a fuel is the amount of heat released during the combustion of a specified amount of it.
Which increases overall efficiency of boiler?
Installing a blowdown heat exchanger, flash tank or combination of the two can help recover some of this energy for your boiler system. Using heat recovery to cool down the blowdown and heat up your make-up water will improve energy efficiency.
What is the difference between lower heating value LHV and higher heating value HHV )?
HHV stands for higher heating value while LHV stands for lower heating value. The key difference between HHV and LHV is that HHV can be determined by bringing all the products of combustion back to the original pre-combustion temperature while allowing any produced vapour to condense.
Why is the HHV always higher than the LHV?
The numerical difference between the LHV and HHV of a fuel is roughly equivalent to the amount of latent heat of vaporization that can be practically recovered in a secondary condenser per unit of fuel burned. The numerical value of HHV is always greater than or equal to the LHV.
How is the efficiency of a boiler determined?
It is calculated by dividing the boiler output (in BTUs) by the boiler input (in BTUs) and multiplying by 100. The actual input and output of the boiler are determined though instrumentation and the data is used in calculations that result in the fuel-to-steam efficiency.
Which of the following is a fixed the factor on which boiler efficiency depends?
Explanation: The efficiency of a boiler depends on two types of factors – fixed factors and variable factors. Boiler design, Heat recovery equipment, built in loses, rated rate of firing and properties and characteristics of the fuel burnt are all fixed factors.
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