Chimney Area Heat Load

Reference data and engineering information about chimney area heat load for combustion applications.

chimneyareaheatloadCalculator

Overview

Engineering reference data for Chimney Area Heat Load in combustion engineering.

$Q = \dot{m} \cdot HV$

Fuel energy release rate.

$AF = \frac{m_{air}}{m_{fuel}}$

Mass of air per mass of fuel.

$EA = \frac{O_2}{21 - O_2} \times 100\%$

From flue gas oxygen measurement.

10 rows

Required chimney area as a function of boiler heat load capacity.
Boiler Capacity(kW)	Boiler Capacity(Btu/h)	Required Chimney Area(cm²)	Required Chimney Area(in²)
15	51000	115	18
23	78000	150	23
35	119000	200	31
46	157000	250	39
58	198000	300	47
70	239000	350	54
81	276000	400	62
93	317000	450	70
104	355000	500	78
116	396000	550	85

Source: engineeringtoolbox.com

The conversion factor between power units is:

$1 \text{ kW} = 3412 \text{ Btu/h}$

Design Reminder: Always check and comply with requirements from your local building authorities and codes before finalizing your chimney design.