How to use the DRYIT semi-continuous tray dryer
Practical Action
ANNEX 1: Useful data for calculations
Some SI units
Physical Quantity
Energy
Power
SI Unit
Joule
Watt
Common conversion factors
Imperial
Volume
1 ft3
1 UK Gallon (gal)
Volumetric Flow
1 ft3 min-1 (cfm)
Energy
1 kWh
1 therm
Power
1 Horse Power (hp) (British)
1 Btu lb-1
Calorific Value
1 Btu lb-1
Density
1 lb ft3
Calorific values
Fuel type
Hydrogen
Methane
Propane
Kerosene
Butane
Octane
Fuel Oil
Coal (5% Ash)
Coal (10% Ash)
Briquettes
30-45% Charcoal Dust
30-45% Chopped Twigs
15-20% Manure
Dry Beach Wood
Black Coffee Husks
Cotton Stalks
Corn Stover
Waste paper balls made from newspaper
Wood (general)
Briquettes
50% Straw 50% Manure
Rice Husk
Briquettes
40% Straw, 40% Sawdust
Unit Symbol
J =Nm
W = Js-1
Metric
0.0283 m3
4546 cm3
4.72 x 10-4 m3 s-1
3.600 MJ
105.5 MJ
745.7 W
0.2931 W
2.326 kJ kg-1
16.02 kg m-3
Btu lb-1
51980
21560
19800
19810
19650
19290
17800
15050 - 15910
8598 - 9 458
7954
KJ / kg
120900
50140
46050
46000
45710
44880
41400
35000 - 37000
20000 – 22000
18500
7610
7524
7395
7395
6 922
6 879
6 492
5 933
5 890
17700
17500
17200
17200
16100
16000
15100
13800
13700
33