Discussion
Calorific values and bulk densities of four fuels.
| Fuel | Calorific value (MJ/kg) | Bulk density (kg/m\(^3\)) | Energy density (MJ/m\(^3\)) |
|---|---|---|---|
| Loose rice husk | 14 | 100 | 1400 |
| Husk briquettes | 15 | 650 | 9750 |
| Bagasse, wet | 9 | 150 | 1350 |
| Fuel oil | 42 | 900 | 37800 |
What does the comparison of the first two rows show?
Answer: B
Correct answer: Briquetting transforms energy per cubic metre only
Compare the two rows: the calorific value rises only from 14 to 15 MJ/kg, essentially unchanged, while the energy density rises from 1400 to 9750 MJ/m\(^3\) - a factor of seven.
The whole of the gain is in volume, because briquetting compacts the material without altering its chemistry. That is exactly the problem it is meant to solve: loose husk fills a lorry long before it approaches the weight limit, so transport cost per tonne is what makes distant use uneconomic, and density is what fixes it.
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