How to use the DRYIT semi-continuous tray dryer
Practical Action
20% Manure
Briquettes
25% charcoal dust, 25% straw
30% chopped twigs, 20% manure
Green Beach Wood
Cow Dung
Bogasse
Briquettes made from charcoal dust with clay
as a binder
Gas
5 632
5 202
4 385
3 439 - 8 169
1 758
Btu ft-3
510
13100
12100
10200
8000 – 19000
4090
KJ/ m3
19000
• Specific Heats (at a constant pressure)
Btu ft-3
KJ kg-1 K-1
Air
0.2400
1.005
• Specific Heat of Air (c)
C = 1 + 1.942 h (KJ kg-1 K-1) (where h = absolute humidity of air)
• Densities (at STP)
lb ft-3
kg m-3
Air
0.0800
1.280
• Variation of latent heat of water with temperature
Temperature °C
20
40
60
80
100
Latent Heat (kJ / kg-1)
2384
2326
2280
2233
2210
ANNEX 2: Fuel use graph
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