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More about Dried FireWood in Net Bags.

Large Crates Dried FireWood is used for home consumtion of died firewood and the Firewood on pallet boxes can easily be moved by forklift.

Dried FireWood in Net Bags are used mostly in homes and are usually sold in a Big Markets like Metro, Gas stations , etc.

Type of wood – whether it is hardwood or softwood – burned in the combustion process is important for the heat value and the energy efficiency.

Hardwoods have less resin and burn slower and longer. Softwoods burn quickly. In addition the seasoned length influences on the fuel efficiency. Seasoning the wood refers to the allowed drying time before combustion.

Wood need to be dried at least 4 to 6 months before use. Our wood is dried at least 10-12 months.

Densities and heat values of some common wood species are indicated in the table below. Note that the volume of a stack of firewood varies considerably on whether or not it is split and how it is stacked. The moisture content also play a role – the values below are based on a average moisture content of 20%.

• 1 ft (foot) = 0.3048 m
• 1 lb = 0.4536 kg
• 1 lb/ft ³  = 16.018 kg/m ³
• 1 Btu (British thermal unit) = 1,055.06 J = 107.6 kpm = 2.931×10 ^-4  kWh = 0.252 kcal = 778.16 ft lb _f  = 1.055×10 ¹⁰  ergs = 252 cal = 0.293 watt hour

Note that in the table above 1 net cord volume = 85 ft³ is used to convert between the “Density” and “Weight of Cord” column (1 stacked cord volume = 128 ft³). Be aware that the densities used for the wood species varies significantly. The densities used above is for natural dried wood where the average moisture content is approximately 20%.

Heat values of cords with dry wood can be estimated by adding 10% to the green wood cords values.

Recoverable heat values are calculated with a stove efficiency of approximately 65%.
How to Calculate the Combustion Heat in MJ/kg from the Table above

1. calculate “Density of Dry Wood” in kg/m³ by multiplying lb/ft³ with 16.018
2. calculate “Weight of Dry Wood” in kg/cord by multiplying lb/cord with 0.4536
3. calculate “Recoverable Heat Value of Cord (Dry Wood)” in MJ/cord by multiplying Millions Btu/cord with 1055.06
4. calculate “Recoverable Heat Value per kg (Dry Wood)” in MJ/kg by dividing 3 with 2

Example – Red Oak

1. “Dichtheid van droog hout”:  44,2 (lb/ft ³ ) 16,018 = = 708 (kg/m ³ )
2. “Gewicht van droog hout”:   3760 (lb/koord) 0,4536 = 1705,5 (kg/koord)
3. “Herwinbare warmtewaarde van koord (droog hout)”:  24,0 (miljoenen Btu/koord) 1055,06 = 25304 (MJ/koord)
4. “Herwinbare warmtewaarde per kg (droog hout)”:  25304 (MJ/koord) / 1705,5 (kg/koord) = 14,8 (MJ/kg)

Het verbrandingsproces van het verbranden van hout

1. Hout warmt op tot ongeveer  212  ^o F (100  ^o C)  en verdampt het vocht erin. Er is op dit punt geen verwarming van het hout
2. Vaste houtsoorten beginnen af ​​te breken en de brandstofgassen worden omgezet ( bij een temperatuur van ongeveer  300 ^° C ,  575 ^° F )
3. Van  575  ^o F tot 1100  ^o F  ( 300 – 600  ^o C  ) komt de belangrijkste energie in het hout vrij wanneer brandstofdampen  die 40% tot 60%  van de energie bevatten, verbranden.
4. Na het verbranden van de brandstofdampen en het verdampen van het vocht, blijft alleen houtskool over dat brandt bij temperaturen hoger dan 1100 ^o  F

• T _C  = 5 / 9 (T _F – 32)

Netto calorische waarde (CV) of Lower Heating Value (LHV) gegeven voor alle brandstoffen. Dit betekent dat de latente warmte van verdamping van de waterdamp die ontstaat door verbranding niet wordt teruggewonnen door condensatie