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4-3.Drying speed and temperature of the hot air

Changes of the saturation water vapor amount by hot air temperature

4-3-1.Features of the hot wind heat source Dryness with constant temperature and humidity of a hot wind is called the constant drying condition. If the temperature of a hot air is changed, the relative humidity and specific heat, density, viscosity, ...

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4-2.Drying speed and wind speed of the hot air

Drying speed and wind speed of the hot air

Temperature and Humidity of the hot air is called the steady-state drying conditions drying constant. 4-2-1.If wind velocity of a hot wind is enlarged, a coefficient of heat transfer will also become large. Heat transfer coefficient of the dry conditions ...

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4-1.The air and the nitrogen

The air and the nitrogen

Check the performance of the air and nitrogen as the medium to be used in the hot-air drying. 4-1-1.The role of air Air at room temperature, the atmospheric pressure will behave as a nearly ideal gas. Density of air ρ ...

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No.95 Hot air shot peening

[ Problem Point ] In order to thicken a metallic thin film, the high temperature hot wind was required. [ ⇒Kaizen Point ] The shot-peened under high temperature conditions using the Air Blow Heater. Junction went well even if thickening ...

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No.94 Hot air anthelmintic

[ Problem Point ] Requires secure chemical-free pest control that do not use chemical fumigation. [ ⇒Kaizen Point ] Hot air is anthelmintic, in a way that does not use chemicals, to disinfect from egg to adult in a hot-air, ...

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No.93 Heat shrink the capacitor

[ Problem Point ] It did not shrink processed while temperature control. [ ⇒Kaizen Point ] The precise temperature control in the Air Blow heater, it was appropriate temperature heating. Thermal destruction is eliminated, defect rate was reduced.

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No.90 Heat test of bearing

[ Problem Point ] Managing the heat-resistant temperature of grease, it came to carry out a quality assessment and there was nothing. [ ⇒Kaizen Point ] It heated from room temperature to 550℃ with the Air blow heater. The quality ...

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3-6.Importance of dehydration

Energy for evaporating the water 1kg of 20 ℃ is 2454kJ. 1kW/h is 3600kJ so…. 2454kJ is the working time and energy consumption of the same amount running 40 minutes of 1kW motor. Or, the halogen heater 5kw 85% efficiency ...

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3-5.Balance of the process

When dry quickly at high speed wet material, deviation of the moisture content and temperature of the material inside will increase. As a result, the critical moisture content is increased, it may cause cracks. When it comes to the state ...

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3-4.Five patterns of the drying curve

As for the Drying characteristic curve of the Decreasing drying rate period, five patterns appear with the characteristic of material. The type of material The composition of material The shape of material The possession state of water A-Type A-type is ...

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3-3.Heat balance equation of the drying

The heat balance is the sum of 4 types heat、which is entering heat, exiting heat, generation of heat, and endothermic. By the law of conservation of energy, the quantity of these (Quantity of heat change of the system) = (Quantity ...

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3-2.Evaporation of water

In order to move water vapor becomes water evaporates, the water vapor pressure difference is required between the air and the convection layer and the surface of the material. Water vapor of the material surface so that the saturated pressure ...

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3-1.Heat transfer and Mass transfer

In the classification of thermodynamics, a dry process is a “The open system.” Dryness is “evaporating and separating a liquid from a solid.” Heat and pressure are operated, water is evaporated and it moves. The height of heat is the ...

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