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Science of the drying

5-3.Efficient method of Infrared ray drying

5-3-1.Distance from the Heater

5-3-1.Distance from the Heater The infrared rays are projected from the heater to reach the heating object is propagated through space. Because the space is not being vacuum exists air, infrared rays will be to heat the air. And, correspondingly, ...

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5-2.Heat balance equation of Infrared ray drying

Heat balance equation of Infrared ray drying

The electrical energy (electric power) supplied from the power supply serves as electromagnetic waves, and jumps out of a heating element. The electromagnetic waves exist wavelength of various kinds, but the most effective in heating is infrared rays. The low- ...

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5-1.Infrared rays wavelengths and water

5-1.Infrared rays wavelengths and water

5-1-1.Water will absorb the infrared. The difference between the absorption rate by the wavelength of infrared Although there are, as shown in the figure below, the thickness of the water film it absorb 100% infrared at any wavelength and more ...

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4-5.Drying speed and angle of the hot air

4-5.Drying speed and angle of the hot air - Science of the drying

The case of hot air flows parallel to the material (co-current) In order to contact a high temperature hot air near a material entrance, a drying speed is large and decreases to urgency after that. Since material contacts a high ...

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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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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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2-11.Dew point and Dew point meter

1.Dew point The dew point is the temperature from which condensation begins, when the air containing vapor is cooled. It is also referred to as the dew point temperature. Unit is used to evaluate the K or Kelvin degrees Celsius ...

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2-10.The Psychrometric charts

Psychrometric charts A psychrometric chart for sea-level elevation Terminology A psychrometric chart is a graph of the thermodynamic parameters of moist air at a constant pressure, often equated to an elevation relative to sea level. The ASHRAE-style psychrometric chart, shown ...

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2-8.The principle of the Psychrometer

The principle of the Psychrometer - Science of the drying

If alcoholic disinfection is carried out before injecting, when alcohol evaporates, he will have a cold feeling to because heat is taken. In order for a liquid to turn into gas, energy is required and this energy is called evaporation ...

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2-7.Psychrometer and Hygrometer

2-7-1.Spirits of Dry and Wet Líu Ān (Chinese: 劉安, c.179 – 122 BC) was a Chinese king and advisor to his nephew, Emperor Wu of Han (武帝). The old days of more than 2000 years from now, Concept of humidity ...

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2-5.Absolute humidity

Absolute humidity Generally, if it is only called “Humidity”, “Relative Humidity =RH” will be pointed out, but it is convenient to use the absolute humidity from which a value does not change in a design or control of a drier ...

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