Simple Calculation Method for Drying Room Heat Power
Regarding how much heating power a drying room requires, I’d like to share a simple calculation method I’ve summarized. Since it’s simple, it may not be entirely precise, so researchers should not rely on this approach. This article is intended for those who plan to use carbon fiber heating elements to DIY drying ovens or baking ovens.
Let’s take one of our customers as an example. They originally used a combustion furnace (burning pellets or wood scraps). Due to environmental reasons, they wanted to switch to electric heating elements. The drying room walls were insulated with cotton, and the material being dried was semidry pine wood. The required drying temperature was to reach 80°C within 2 hours.
Basic Physics Knowledge (All parameters can be found via search engines):
 Weight = Density x Volume
 Heat = Power x Time
 Heat required to raise the temperature of an object = Specific Heat Capacity x Temperature Difference
 Specific heat capacity of wood: 1.72 x 10^3 J/(kg.K)
 Specific heat capacity of air: 1.003 x 10^3 J/(kg.K)
 Density of pine wood: 0.5~0.7 x 10^3 kg/m³, use 0.6 x 10^3
 Density of air: 1.29 kg/m³
 Volume: Assume wood fills 70% (this ensures the power calculation won’t be too low), air is calculated at 15 cubic meters
 Temperature difference: 90°C – 0°C (assuming winter low temperatures of 0°C)
Step 1: Calculate the Power Required to Heat the Wood
 Calculate the weight of pine wood
Weight of pine wood = 0.6 x 10^3 x 15 x 70% = 6300 kg  Calculate the heat required to raise the temperature
Heat required = 6300 kg x (90°C – 0°C) x 1.72 x 10^3 J/(kg.°C) = 9.75 x 10^8 J  Calculate the power
Power = 9.75 x 10^8 J / (2 x 3600 s) = 135450 W ≈ 136 kW
Step 2: Calculate the Power Required to Heat the Air
 Calculate the weight of the air
Weight of air = 1.29 x 15 = 19.35 kg  Calculate the heat required to raise the temperature
Heat required = 19.35 kg x (90°C – 0°C) x 1.003 x 10^3 J/(kg.°C) = 1.75 x 10^6 J  Calculate the power
Power = 1.75 x 10^6 J / (2 x 3600 s) = 243 W ≈ 500 W (the power required to heat the air can be ignored)
Step 3: Calculate Heat Loss in the Drying Room
Heat loss through insulation, metal components, and other factors is uniformly discounted by 15%.
Final Total Power Calculation
Total power = 136 kW x (1 + 15%) = 156.4 kW
A quick calculation method is that a drying room for wood requires approximately 10 kW per cubic meter of space.
If you use 1200W carbon fiber heating elements, you would need 130 units.
Additional Knowledge:
 Heat Conversion: 1 kilocalorie (kcal) = 4.1858518 kilojoules (kJ) (Quick calculation: kJ/4 = kcal)
GlobalQT specializes in manufacturing highquality carbon fiber heating elements and quartz tube solutions. For more information, visit our vefsíðu eða hafðu samband við okkur á contact@globalquartztube.com.
Author

Casper Peng is a seasoned expert in the quartz tube industry. With over ten years of experience, he has a profound understanding of various applications of quartz materials and deep knowledge in quartz processing techniques. Casper's expertise in the design and manufacturing of quartz tubes allows him to provide customized solutions that meet unique customer needs. Through Casper Peng's professional articles, we aim to provide you with the latest industry news and the most practical technical guides to help you better understand and utilize quartz tube products.
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