Mo-Dave
Quintessential Chatty Farker
- Joined
- Sep 18, 2006
- Location
- Hurrican...
Trying to answer the question of dripping fat in a uds/cooker, creating an unfavorable odor and flavor for some. No doubt some do find it offensive for what ever reason but I have to rule out a low fire temp causing the fat to just smolder, creating this offensive condition to some.
If you move down to the part about the combustion process of wood and look at combustion points, in order for wood to make heat, then go down farther to smoke point of fats and grease you will see for even the lowest cooking temps say 200 to 300 of the degrees in the cooker, the fire would burn way above the combustion point of dripping fat plenty hot enough to burn the fat completely and not just smolder.
I am not calling anyone out on this in fact I understand completely, my youngest son would get violently ill to the point of puking if we cooked any form of sausage in the house no matter if it were boiled, baked or fried and no way could he eat it. But take that same meat and cook it outside on the grill and he loved it, go figure.
Wish I had one of those en-foray hand held gauges to check how hot a fire is at its surface is and know for sure. Any one want to do a test.
Anyway if my links works here you may find some other useful info to consider.
Dave
Wood and Combustion Heat Values
Firewood and combustion heat values - Pine, Elm, Hickory and many more species
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.
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%.
Wood Species Density of Dry Wood
(lb/ft3) Weight of Dry Cord
(lb/cord) Recoverable Heat Value of Cord (Dry Wood)
(millions Btu/cord) Heat Value of Cord (Green Wood)
(millions Btu/cord) Units needed to produce 1 Million (cord/Btu's) Apple 48.7 4,100 26.5 18.6 0.054 Ash, white 22.3
Aspen 27 2,290 14.7 10.3 0.097 Balsam Fir 26.3 2,240 14.3 10.0 0.10 Basswood 24.8 2,110 13.5 9.5 0.106 Beech 44.2 3,760 24 16.8 0.060 Birch 21.7 Black Ash 35.2 2,990 19.1 13.4 0.075 Black Spruce 29.2 2,480 15.9 11.1 0.090 Boxelder 32.9 2,800 17.9 12.5 0.080 Buckeye 13.4 Butternut 15.4 Catalpa 16.4 Cherry 36.7 3,120 20 14 0.071 Chestnut 12.9 Coffeetree 21.6 Cottonwood 24.8 2,110 13.5 9.5 0.106 Dogwood 27.0 Douglas Fir 26.4 East Hop hornbeam 50.2 4,270 27.3 19.1 0.052 Elm 35.9 3,050 19.5 13.7 0.073 Hackberry 38.2 3,250 20.8 14.6 0.069 Hemlock 29.2 2,480 15.9 11.1 0.090 Hickory 50.9 4,330 27.7 19.4 0.052 Ironwood 26.0 Jack Pine 31.4 2,670 17.1 12.0 0.084 Larch - Eastern 18.7 Locust 27.3 Lodgepole pine 19.3 Maple 21.6 Mulberry 25.8 Norway Pine 31.4 2,670 17.1 12.0 0.084 Osage Orange 32.9 Paper Birch 37.4 3,180 20.3 14.2 0.070 Pinon Pine 33.5 Ponderosa Pine 28 2,380 15.2 10.6 0.094 Redcedar - east 19.8 Red Oak 44.2 3,760 24 16.8 0.060 Red Maple 34.4 2,920 18.7 13.1 0.076 Spruce 16.0 Sucamore 19.5 Sugar Maple 44.2 3,760 24 16.8 0.060 Tamarack 38.2 3,250 20.8 14.6 0.069 Tanarack pine 21.2 Yellow Birch 43.4 3,690 23.6 16.5 0.061 Yellow pine 22.0 Walnut - black 21.5 White Ash 43.4 3,690 23.6 16.5 0.061 White Oak 47.2 4,010 25.7 18.0 0.056 White Pine 26.3 2,240 14.3 10.0 0.100 Willow 13.2
Heat values of Cords with dry wood can be estimated by adding the green wood cords values with approximately 10%.
Recoverable heat values are calculated with a stove efficiency of approximately 65%.
The Combustion Process of Burning Wood
ToolBox ShortList
• Add this Page!
Search the ToolBox!
Translate this Page!! About Us!
Temperature
oC
oF
Length
m
km
in
ft
yards
miles
nautical miles
Volume
m3
liters
in3
ft3
us gal
Velocity
m/s
km/h
ft/min
ft/s
mph
knots
Pressure
Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O
Flow
m3/s
m3/h
US gpm
cfm
Unit Converter
Scientific
Calculator
Free Industry Magazines
Maintenance Technology
EDN
Test & Measurement World
Engineering News
PrinterFriendly
ToolBox ShortList
• Add this Page!
Link to this Page!
Comparative properties of common cooking fats (per 100g)
Total Fat Saturated Fat Monounsaturated Fat Polyunsaturated Fat Smoke Point Vegetable Shortening (hydrogenated) 71g 23g 8g 37g 182°C (360°F) Sunflower oil 100g 11g 20g 69g 232°C (450°F) Soybean oil 100g 16g 23g 58g 232°C (450°F) Peanut oil 100g 17g 46g 32g 232°C (450°F) Olive oil 100g 14g 73g 11g 216°C (420°F) Lard 100g 39g 45g 11g 188°C (370°F) Suet 94g 52g 32g 3g 200°C (400°F) Butter 81g 51g 21g 3g 177°C (350°F)
Free Industry Magazines
Control
Product Design & Development
Pipeline & Gas Journal
ToolBox Short List
Difficult to find your favorite ToolBox page? Add links to your favorite pages in your own personal Short List!
• Add this Page! • Delete the ShortList!
Engineering ToolBox - SketchUp Edition - Online 3D modeling!
Engineering ToolBox - SketchUp Edition - enabled for use with the amazing, fun and free Google SketchUp.
Search the ToolBox
Custom Search
Translate the ToolBox
Arabic - Chinese (Simplified) - Chinese (Traditional) - Dutch - French - German - Italian - Japanese - Korean - Portuguese - Russian - Spanish
About the ToolBox
We appreciate any comments and tips on how to make The Engineering ToolBox a better information source. Please contact us by email
if You find any faults, inaccuracies, or otherwise unacceptable information.
The content in The Engineering ToolBox is copyrighted but can be used with NO WARRANTY or LIABILITY. Important information should always be double checked with alternative sources. All applicable national and local regulations and practices concerning this aspects must be strictly followed and adhered to.
Advertise in the ToolBox
If you want to promote your products or services in this site - please follow this link.
If you move down to the part about the combustion process of wood and look at combustion points, in order for wood to make heat, then go down farther to smoke point of fats and grease you will see for even the lowest cooking temps say 200 to 300 of the degrees in the cooker, the fire would burn way above the combustion point of dripping fat plenty hot enough to burn the fat completely and not just smolder.
I am not calling anyone out on this in fact I understand completely, my youngest son would get violently ill to the point of puking if we cooked any form of sausage in the house no matter if it were boiled, baked or fried and no way could he eat it. But take that same meat and cook it outside on the grill and he loved it, go figure.
Wish I had one of those en-foray hand held gauges to check how hot a fire is at its surface is and know for sure. Any one want to do a test.
Anyway if my links works here you may find some other useful info to consider.
Dave
Wood and Combustion Heat Values
Firewood and combustion heat values - Pine, Elm, Hickory and many more species
Sponsored Links
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.
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%.
Wood Species Density of Dry Wood
(lb/ft3) Weight of Dry Cord
(lb/cord) Recoverable Heat Value of Cord (Dry Wood)
(millions Btu/cord) Heat Value of Cord (Green Wood)
(millions Btu/cord) Units needed to produce 1 Million (cord/Btu's) Apple 48.7 4,100 26.5 18.6 0.054 Ash, white 22.3
Aspen 27 2,290 14.7 10.3 0.097 Balsam Fir 26.3 2,240 14.3 10.0 0.10 Basswood 24.8 2,110 13.5 9.5 0.106 Beech 44.2 3,760 24 16.8 0.060 Birch 21.7 Black Ash 35.2 2,990 19.1 13.4 0.075 Black Spruce 29.2 2,480 15.9 11.1 0.090 Boxelder 32.9 2,800 17.9 12.5 0.080 Buckeye 13.4 Butternut 15.4 Catalpa 16.4 Cherry 36.7 3,120 20 14 0.071 Chestnut 12.9 Coffeetree 21.6 Cottonwood 24.8 2,110 13.5 9.5 0.106 Dogwood 27.0 Douglas Fir 26.4 East Hop hornbeam 50.2 4,270 27.3 19.1 0.052 Elm 35.9 3,050 19.5 13.7 0.073 Hackberry 38.2 3,250 20.8 14.6 0.069 Hemlock 29.2 2,480 15.9 11.1 0.090 Hickory 50.9 4,330 27.7 19.4 0.052 Ironwood 26.0 Jack Pine 31.4 2,670 17.1 12.0 0.084 Larch - Eastern 18.7 Locust 27.3 Lodgepole pine 19.3 Maple 21.6 Mulberry 25.8 Norway Pine 31.4 2,670 17.1 12.0 0.084 Osage Orange 32.9 Paper Birch 37.4 3,180 20.3 14.2 0.070 Pinon Pine 33.5 Ponderosa Pine 28 2,380 15.2 10.6 0.094 Redcedar - east 19.8 Red Oak 44.2 3,760 24 16.8 0.060 Red Maple 34.4 2,920 18.7 13.1 0.076 Spruce 16.0 Sucamore 19.5 Sugar Maple 44.2 3,760 24 16.8 0.060 Tamarack 38.2 3,250 20.8 14.6 0.069 Tanarack pine 21.2 Yellow Birch 43.4 3,690 23.6 16.5 0.061 Yellow pine 22.0 Walnut - black 21.5 White Ash 43.4 3,690 23.6 16.5 0.061 White Oak 47.2 4,010 25.7 18.0 0.056 White Pine 26.3 2,240 14.3 10.0 0.100 Willow 13.2
- 1 ft (foot) = 0.3048 m
- 1 lb = 0.4536 kg
- 1 Btu (British thermal unit) = 1,055.06 J = 107.6 kpm = 2.931x10-4 kWh = 0.252 kcal = 778.16 ft lbf = 1.055x1010 ergs = 252 cal = 0.293 watt hour
Heat values of Cords with dry wood can be estimated by adding the green wood cords values with approximately 10%.
Recoverable heat values are calculated with a stove efficiency of approximately 65%.
The Combustion Process of Burning Wood
- Wood heats up to approximately 212 oF (100 oC) evaporating the moisture in it. There is no heating from the wood at this point
- Wood solids starts to break down converting the fuel gases (near 575 oF, 300 oC)
- From 575 oF to 1100 oF (300 - 600 oC ) the main energy in the wood is released when fuel vapors containing 40% to 60% of the energy burn
- After burning fuel vapors and evaporated the moisture, only charcoal remains burning at temperatures higher than 1100o F
- TC = 5/9(TF - 32)
Sponsored Links
Related Topics - Combustion - Boiler house topics - fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency
- Heating - Heating systems - capacity and design of boilers, pipelines, heat exchangers, expansion systems and more
- Material Properties - Material properties - density, heat capacity, viscosity and more - for gases, fluids and solids
Sponsored Links
Related Documents - Fire Wood - the Cord - The cord is one of the most common units for purchasing fuel wood
- Wood Densities - Density of wood as apple, ash, cedar, elm and more
- Wood Species - Weight at various Moisture Contents - Weight of green and air-dry fuel wood
- Wood and Bio Mass Heat - Combustion values of wet and dry wood - Btu/pounds, kJ/kg and kcal/kg
- Home
- • Acoustics
- • Air Psychrometrics
- • Basics
- • Combustion
- • Drawing Tools
- • Dynamics
- • Economics
- • Electrical
- • Environment
- • Fluid Mechanics
- • Gas and Compressed Air
- • HVAC Systems
- • Hydraulics and Pneumatics
- • Insulation
- • Material Properties
- • Mathematics
- • Mechanics
- • Miscellaneous
- • Physiology
- • Piping Systems
- • Process Control
- • Pumps
- • Standards Organizations
- • Steam and Condensate
- • Thermodynamics
- • Water Systems
ToolBox ShortList
• Add this Page!
Search the ToolBox!
Translate this Page!! About Us!
Temperature
oC
oF
m
km
in
ft
yards
miles
nautical miles
m3
liters
in3
ft3
us gal
m/s
km/h
ft/min
ft/s
mph
knots
Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O
m3/s
m3/h
US gpm
cfm
Scientific
CalculatorFree Industry Magazines
EDNTest & Measurement World Engineering News
ToolBox ShortList
• Add this Page!
Link to this Page!
Comparative properties of common cooking fats (per 100g) Total Fat Saturated Fat Monounsaturated Fat Polyunsaturated Fat Smoke Point Vegetable Shortening (hydrogenated) 71g 23g 8g 37g 182°C (360°F) Sunflower oil 100g 11g 20g 69g 232°C (450°F) Soybean oil 100g 16g 23g 58g 232°C (450°F) Peanut oil 100g 17g 46g 32g 232°C (450°F) Olive oil 100g 14g 73g 11g 216°C (420°F) Lard 100g 39g 45g 11g 188°C (370°F) Suet 94g 52g 32g 3g 200°C (400°F) Butter 81g 51g 21g 3g 177°C (350°F)
Free Industry Magazines
Product Design & DevelopmentPipeline & Gas Journal ToolBox Short List
Difficult to find your favorite ToolBox page? Add links to your favorite pages in your own personal Short List!
• Add this Page! • Delete the ShortList!
Engineering ToolBox - SketchUp Edition - Online 3D modeling!
Engineering ToolBox - SketchUp Edition - enabled for use with the amazing, fun and free Google SketchUp. Search the ToolBox
Custom Search
Translate the ToolBox
Arabic - Chinese (Simplified) - Chinese (Traditional) - Dutch - French - German - Italian - Japanese - Korean - Portuguese - Russian - Spanish
About the ToolBox
We appreciate any comments and tips on how to make The Engineering ToolBox a better information source. Please contact us by email
if You find any faults, inaccuracies, or otherwise unacceptable information.
The content in The Engineering ToolBox is copyrighted but can be used with NO WARRANTY or LIABILITY. Important information should always be double checked with alternative sources. All applicable national and local regulations and practices concerning this aspects must be strictly followed and adhered to.
Advertise in the ToolBox
If you want to promote your products or services in this site - please follow this link.
