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ruchiraslk
Commentator

Join Date: Mar 2009
Posts: 67

Hot Air Oven

04/01/2010 11:30 PM

i need a hot air oven to pre-heat tire carcasses. one carcass has a mass of 150kg (rubber density is about1300 kg/m3). i need to pre-heat 10 tires at one time.

pre-heat time: 2hrs

temperature: 135 C (27c to 135c)

how i calculate needed power and air flow rate to this oven. heat is to generate using electric heater coils. oven size is 1.5mx1.5x3.5m.

please tell me the information that i need to know and where should i find to do a rough calculation about this requirment.
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dvmdsc
Guru
United States - Member - New Member

Join Date: Mar 2010
Location: In the pool because it is too hot.
Posts: 3054
Good Answers: 141
#1

Re: Hot Air Oven

04/06/2010 10:03 PM

You would consider not to run heat TO the oven but in the oven.

The more you let the process work in your oven, the more economical.

Consider air circulation IN the oven by means of a fan inside, and the motor outside the oven (shielded from the heat).

Your heat balance needs to be calculated in function of the speed (time to reach your max. temperature with max. load), the times the door opens, and the apparent heat loss. Isolation, material to heat up in the oven (mass) such as walls, floor, ceiling.

Fast is more installed power, thicker wiring, not always resulting in more power use when the temperature is controlled with thermostat, or if more precision is wanted, thermocouple with different type of control units.

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