Design and implementation of an alternative heat source for wood presses.

Omar Baara		      Mohamed Hamadneh
Omar Abu Mady		Fahmy AbdulQader











The woodwork industry in Palestine has grown rapidly in the past few years and so did the demand of energy.







Composite and MDF
Wood products 








Thermal wood press






Heating is too expensive!
The problem







Wood burner
Alternative solutions






Fuel burner







Parts


Controlled fuel injector 
Air pressure regulator







Air blower
Underground fuel tank






Propane gas supply 

Heat exchanger






3”
1/2”












Two 3” pipes are welded together using a 90 degrees steel elbow

Methodology







Two holes are drilled into the horizontal pipe for the fuel and gas intake.







Lastly, a cylindrical heat exchanger was fitted to the vertical 3” pipe







The propane gas lighter is turned on until the burner is hot enough.

The fuel is the added in controlled volumes along with air from the blower

The propane gas is then turned off.
Igniting the burner





Results and analysis





Pout= 3 * 220 * 90 * 0.85
 
 = 50490 W = 50.5 KW
 Therefore the new heater should be able to supply 50.5 KW





Waste oil specifications2:
Density: 885 Kg/m3
Viscosity: 3.49 
Flash point: 57oC
Calorific Value (CV): 42500 KJ/KG
Efficiency (η): 75%

Fuel heater






 
 50.5 kW= 42500 *  * 0.75
= 1.58*10-3 kg/s
 Volumetric flow rate= (1.58*10-3)/885= 1.8*10-6  m3/s = 1.8*10-3 l/s







Cost analysis:

Electric heater:
1kWh= 0.5 NIS
Total cost from the electrical heater for one day=
50.5*0.5*16= 404 NIS/day
 
Waste oil heater:
1m3 of waste oil= 1600 NIS
Total cost from the waste oil heater for one day=
(1600)*(1.8*10-6)*3600*16= 166 NIS/day











Cost/ day	Electric	Waste oil	404	166	Column1	Electric	Waste oil	Column2	Electric	Waste oil	




Electrical	January	February	March	April	May	June	July	August	September	October	November	December	10504	9696	10908	10504	10706	10827.2	10948.4	11069.6	11190.8	11312	11433.2	11554.4	Waste oil	January	February	March	April	May	June	July	August	September	October	November	December	4316	3984	4482	4316	4399	4448.8	4498.6000000000004	4548.3999999999996	4598.2	4648	4697.8	4747.6000000000004	One of the main problems of such system is over heating. 

It is not possible to repeatedly turn the burner on and off to control the temperature
Controlling the heat





Using the results from the previous calculations, we find






Safety and limitations





Waste oil is hard to ignite





Harmful emissions


















Heat losses in the pipes




Fuel backflow into the tank







Overheating and boiling of thermal oil.








Why oil burners?







Wood burners
Very big !

Fire hazard

Consumes storage space

Harmful emissions





Oil burners

Relatively small

Easy to contain incase of a fire

No storage space required.

Very minimal






Future business plans







Thank you!





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