Boiler design efficiency

Are wisinski boilers more efficient than older boilers?

Now that the equipment is available commercially, more than half of the boilers Wisinski is providing quotes for to prospects are using this new design, which provides between 1 percent and 5 percent greater efficiency in the lower ranges and is comparable in cost to older models.

Boiler Efficiency

Boiler Efficiency related to the boilers energy output to the boilers energy inputcan be expressed as:

Heat Exported from The Boiler to The Fluid

If a fluid like water is used to transfer heat from the boiler - the heat transfer can be expressed as: For a steam boiler the heat exported as evaporated water at saturation temperature can be expressed as:

How to calculate boiler efficiency?

Boiler Efficiency related to the boilers energy output to the boilers energy input can be expressed as:

  • Boiler efficiency (%) = 100 (heat exported by the fluid (water
  • steam .) / heat provided by the fuel) (1) If a fluid like water is used to transfer heat from the boiler - the heat transfer can be expressed as:.
  • Net Calorific Value

    Net calorific value excludes the energy in the water vapor discharged to the stack in the combustion process.
    The combustion process can be expressed as: In general it is possible to use the approximation:

    What is the combustion efficiency of a noncondensing boiler?

    According to the 2012 ASHRAE Handbook–HVAC Systems and Equipment, combustion efficiencies range from 75% to 80% when in the noncondensing mode for most noncondensing boilers operating at return water temperature above 140 F, and 88% to 95% for condensing boilers operating at return water temperatures less than 130 F.

    Why does a traditional boiler have a lower efficiency rating?

    A traditional burner typically operates at lower efficiency ratings because additional oxygen is required for the burner to fire properly, and too much “excess air,” as the added oxygen is termed, can lower boiler efficiency.


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