Science of the drying

Compare the hot air drying and the infrared ray drying Item Hot air drying Infrared ray drying Reduction of the gas boundary membrane ◎ × Removal force of the water vapor ◎ × The presence or absence of shadow ◎ ...

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, ...

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- ...

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 ...

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 ...

Unit area (A) x Unit time (s) The amount of evaporation of moisture (em) is defined as Constant drying rate (Rc). This means not being dependent on material and being dependent on the temperature, humidity, and speed of a hot ...

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, ...

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 ...

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 ...

The 0th law of thermodynamics—Law of heat balances James Clerk Maxwell FRS FRSE (13 June 1831 – 5 November 1879) Scottish mathematical physicist. If the objects A and B, B and C are thermal balances, A and C are also ...

To say that “drying”, there is a dry work of three types. They are dryness of surface water of adhesion, dryness of a coat, and internal dryness of material. Since internal dryness has been explained until now, describes the drying ...

Even if it tells “dryness” to a mouthful, there are three kinds of dry work. They are dryness of surface water of adhesion, dryness of the coating film, and internal dryness of material. Since the preceding sections has explained the ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

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 ...

The heat which appears in the temperature of a substance and can be observed is sensible heat. The heat unobservable although the state of a substance is changed is latent heat. Sensible heat + Latent heat = Total heat The ...

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 ...

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 ...

We have explained the relative humidity and absolute humidity to 2-5 from 2-1. Let’s check again here. Quantity the water of which exists in the air with absolute humidity Even if it heats air, since the weight of the water ...

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 ...