SDB系列空调管道直燃燃烧器使用说明书。

-13-APPENDIX C Combustion Air Flow Calculations

SUNSRAYS "D"series duct burners typically operate with 100%fresh air.

For applications where a percentage of the heated air is to be re-circulated the a minimum volume of fresh air must pass across the burner.

As a “rule of thumb”the volume of air required for operation at 20%excess air is given by:

AirVOL =(Q/CV)x SAGR x 1.2

where AirVOL =Air Volume per hour (m3/h or ft3/h)Q =Heat Input (kW or Btu/h)CV =Gas Calorific Value (kWh/m3or Btu/ft3)

SAGR =Stoiciometric Air/Gas Ratio (m3AIR/m3GAS or ft3AIR/ft3GAS)

Typical Calorific Values for Natural Gas and Propane are:

Natural Gas =10kWh//m3or 1000Btu/ft3Propane =25kWh//m3or 2500Btu/ft3

Stoiciometric Air/Gas Ratios (SAGR)for Natural Gas and Propane are:

Natural Gas =10Propane =25

Example 1

Heat input =200kW Fuel =Natural Gas

Airvol (m3/h)=(200/10)x 10x 1.2=240m3/h

Example 2

Heat input =1,000,000Btu/h Fuel =Natural Gas

Airvol (ft3/h)=(1,000,000/1000)x 10x 1.2=12,000ft 3/h

Example 3

Heat input =400kW Fuel =Propane Gas

Airvol (m3/h)=(400/25)x 25x 1.2=480m3/h

Example 4

Heat input =1,500,000Btu/h Fuel =Propane Gas

Airvol (ft3/h)=(1,500,000/2500)x 25x 1.2=18,000ft3/h