Pretvarač toplinske vrijednosti drvenog goriva Šumarski alati
In-browser calculation
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Podržava ogrjevno drvo i drveni ugljen Svjestan mokre i suhe osnove Usporedba po kg, vreći i volumenu Samo u pregledniku

Usporedba toplinske vrijednosti drvenog goriva

Unesite referentnu ogrjevnu vrijednost, sadržaj vlage i gustoću kako biste usporedili praktičnu toplinsku vrijednost po kilogramu, vreći i zauzetom volumenu.

Koristan je kada trebate brzu usporedbu za cjenike, ponude ili objašnjenje cijene.

Ovaj alat koristi NCV/LHV, a ne HHV/GCV.
All calculations stay in this browser and are not sent to a server. This result is for comparison only. Check the actual selling form and moisture basis before quoting.
Podržava ogrjevno drvo i drveni ugljen
Svjestan mokre i suhe osnove
Usporedba po kg, vreći i volumenu

Kako koristiti

  1. 1
    Enter the reference calorific value and choose dry basis or as received.
  2. 2
    Add moisture content to convert the value to practical heat value.
  3. 3
    Enter bulk density to calculate volume-based heat value.
  4. 4
    Enter the bag weight or bag volume to calculate per-bag heat value.
  5. 5
    Copy or share the result when you need it in a proposal or price sheet.

Brzi primjeri

Firewood: dry basis to practical value
Input

18.8 MJ/kg, dry basis, moisture 30% dry basis, bulk density 450 kg/m3, bag 20 kg

Output

13.9 MJ/kg, 278 MJ/bag, 6.3 GJ/m3

Charcoal: bagged reference value
Input

30.8 MJ/kg, dry basis, moisture 5% dry basis, bulk density 180 kg/m3, bag 10 kg

Output

29.2 MJ/kg, 292 MJ/bag, 5.3 GJ/m3

Referentne vrijednosti

Dry wood and charcoal

FAO reference tables place dry wood around 18.8 MJ/kg and charcoal around 30.8 MJ/kg.

Moisture effect

Higher moisture content sharply lowers practical heat value even when the weight is the same.

Stacked volume units

A cord is 128 ft3 of stacked wood, and stere is treated as 1 m3 of stacked wood.

Pojmovnik

Practical heat value (NCV/LHV)

Heat available for practical use after accounting for water vapor.

Moisture content (wet basis)

Water as a fraction of wet total mass.

Moisture content (dry basis)

Water as a fraction of dry mass. It can exceed 100%.

Bulk density

Mass per occupied volume, including voids.

Formule

M_w = moisture / 100
M_d = M_w / (1 - M_w)
H_ar = H_d * (1 - M_w) - 2.44 * M_w
H_d = (H_ar + 2.44 * M_w) / (1 - M_w)
Energy_per_package = H_ar * package_mass_kg
Energy_per_m3 = H_ar * bulk_density_kg_per_m3

Česta pitanja

Is moisture wet basis or dry basis?
Both are supported. Many sales sheets use wet basis, while biomass literature and tests often use dry basis, so the tool makes the basis explicit.
Is the heat value HHV or LHV?
This tool uses NCV/LHV as the practical heat value. If you have HHV/GCV, convert it to the same basis before using it here.
What density should I enter?
Enter the apparent density of the sold form: stacked logs, bagged charcoal, or bundled fuel including voids.
What do I need for per-bag comparison?
If the bag is sold by weight, enter the bag weight. If it is sold by volume, bulk density is required.
Can it be used outside Japan?
Yes. It is designed from English source text and can switch between metric and imperial display modes. Unit symbols stay the same; only the prose is translated.

Napomene

  • Species, bark fraction, carbonization level, ash content, and storage conditions change the result.
  • Confusing dry basis and wet basis can shift the result by a large amount.
  • Bulk density changes with stacking and packing practice.
  • This tool compares heat value. It does not calculate combustion efficiency or price itself.