Furnace heat release

Furnace heat-release rates, both W/nP and W/m" of effective projec ted radiant surface (Btii/[h fF] and Btii/[h ft ]). 

HR = The furnace heat release per square foot of effective projected radiant surface, BTU/ft %SBV = V /[(C- 1)V -I- VJ, dimensionless... 

In addition, manufacturers boiler operational manuals provide hardcopy data ratings for heat transfer coefficients, local heat flux, fuel utilization, furnace heat release rates, maximum continuous rating... 

Furnace heat release coefficients For packaged FT boilers, designs vary from 60,000 to 125,000 Btu/hr/ft2/°F (340.7-709.8 kW/m2/°K) across the radiant surfaces (essentially the furnace tube). 

Heat Release Rate From Furnace. Heat release rate from the furnace (<3furnace) is calculated from the information obtained in the stack flow rate and species concentrations. Heat release rate is based on the first term in Equation 1. 

For those walls protected by gypsum (walls B-3 and B-4), furnace heat release rate and heat release rates from the fuel gas (Eq. (12)) and the wall (Eq. (13)) are shown in Figures 7 and 8. Similar to the noncombustible wall, the gypsum provided very little heat, except for a small peak in the beginning, which could have been caused by the gypsum paper. Heat release rates from walls B-3 and B-4 rose slowly as a result of the gypsum opening up at the seams or cracks. 

Furnace heat-release rates, both W/m3 and W/m2 of effective projected radiant surface (Btu/[h ft3] and Btu/[h-ft2])... 

Lab Tests. Figures 7.68 and 7.69 are plots of the NO at locations before and in the middle of the convection section at various depths. This data was collected at a total furnace heat release of 4.3 MW (14.7 x 10 Btu/hr) burning 100% Tulsa natural gas ( > 90% CH4) at 3% O2 in the dry exhaust products. The data clearly show that the... 

In fuel-fired furnaces, heat release rate is usually expressed in heat units liberated per unit of furnace volume in unit time, commonly in Btu/ft hr or MJ/m hr. Closely related to rate of furnace heat release is the combustion volume or flame volume. Generally, the furnace volume should be at least equal to the sum of the maximum flame volume and the maximum load volume. The volume of the flame is a function of the combustion intensity condition discussed with table 3.1 subsequently, and where Fc is a configuration factor to assure that all of any one flame s volume is contiguous. 

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