BEE's Jagadhri modified pit furnace report gives three CO2 figures: which one holds?

The three disagree. The Bureau of Energy Efficiency (BEE) report for a modified 600 kg brass pit furnace saves 7.2 tonnes of coke a year, but gives carbon dioxide (CO2) savings of 9 tonnes in its summary, 19 in its text and 11 in its annexure. Using the Intergovernmental Panel on Climate Change (IPCC) factor, 19 to 22 is nearer.

The furnace and the saving

• 600 kg of brass a batch on 80 kg of coke, 4 batches a day for 300 days: 96 tonnes of coke a year.
• The pit corners are rounded: pit volume 0.31248 to 0.29700 cubic metres, so the coke around the crucible falls from 0.20946 to 0.19398 cubic metres. The report rounds that 7.4% to 7.5%, 7.2 tonnes.
• At Rs 22 a kg: Rs 1.58 lakh a year on Rs 0.50 lakh, payback 0.32 years (4 months). Downtime 8 days.

The three carbon dioxide figures

• Summary table: 9 tonnes a year.
• Section on emissions: 19 tonnes a year. That matches the report's own 6,000 kilocalories (kcal) a kg heat value (25.1 gigajoules a tonne) times the Intergovernmental Panel on Climate Change (IPCC)'s 107 kg a gigajoule: 7.2 x 25.1 x 107 / 1,000 = 19.4 tonnes.
• Annexure: 11 tonnes, from a line that gives 4.32 tonnes of carbon (60% of the 7.2 tonnes of coke). 4.32 x 44 / 12 is 15.84, not 11.

What to put in your file

Use the IPCC default factor for coke, 107 kg of carbon dioxide (CO2) a gigajoule, with your coke's heat value and your own invoices: 7.2 tonnes saved is 19 to 22 tonnes a year depending on that heat value. A buyer or lender who sees a different figure in the report will ask which it is.

Carbon dioxide from 7.2 tonnes of coke (estimate)

• IPCC default heat value, 28.2 gigajoules a tonne: 7.2 x 28.2 x 107 / 1,000 = 21.7 tonnes
• The report's 6,000 kcal a kg (25.1 gigajoules a tonne): 7.2 x 25.1 x 107 / 1,000 = 19.4 tonnes
• Carbon method on the report's own 4.32 tonnes: 4.32 x 44 / 12 = 15.8 tonnes
• Report: 9, 19 and 11 tonnes in three places

Coke at the IPCC 2006 default for coke oven coke, an estimate. Furnace figures from the Bureau of Energy Efficiency (BEE) report.

What Senseible does here

Senseible reads fuel invoices and electricity bills into monthly records with carbon dioxide equivalent (CO2e), so fuel bought before and after the furnace change is on record with its bills. The green loan check shows what a lender asks for.

• Green loan readiness check
• Coke pit furnace: efficient brass melting
• Jagadhri brass and aluminium: wood and coke carbon
• Brass melting: coke to wood gasifier

Sources: BEE, Detailed project report: modified pit furnace for brass melting (600 kg), Jagadhri brass and aluminium cluster (SAMEEEKSHA), IPCC 2006 Guidelines, Volume 2 Energy, Tables 1.2 and 2.3

Last reviewed 2026-11-04. Report figures are from a Bureau of Energy Efficiency (BEE) Small and Medium Enterprises (SME) programme project report; costs and paybacks are at the report year's prices. Check today's prices and a current quote before you rely on the payback.