thermal insulation

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thermal insulation

Сообщение merehan1 » 03 сен 2020, 00:58

thermal insulation
Winter photography in winter employers.

1- Heat that penetrates walls, ceilings, and floors.

2- Heat that penetrates windows, doors, and other openings.

3- Heat that is transferred through the ventilation holes.

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The heat that penetrates the walls and ceilings in summer days is estimated at 60-70% of the heat to be removed by air conditioners. As for the rest, it comes from windows and vents.

The percentage of electrical consumed in the summer to cool the building is estimated at 66% of the entire electrical energy consumed. Hence the importance of insulation to reduce electrical energy consumption for air conditioning purposes; This is to reduce heat through walls and roofs

Transmission coefficient
The rate of passage of the GDP is expressed in watts (watts). It has a B U and its unit of measure is: W / m2 ° C.

Then she cries to get what she needs from the GDP.

Coefficient of thermal conductivity
The amount of heat that passes through the unit area of ​​a structural element by one temperature difference factor, and its unit of measure: W / m. O °.

Heat transfer methods:
Heat transfers through materials. Disease physics, conduction, and radiation are transmitted, which can be defined as follows:

A) Delivery
It transfers heat through the particles of a hotter (hotter) solid object to its cooler (hotter) particles and in contact with the hot particles in it.

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B) Pregnancy
It is the transfer of heat in liquids as well as in moving gases. It occurs as a result of the movement of hot particles of a liquid or gas. This movement is formed in turn on the temperature balance of the liquid or gas. Hot in hot, hot in hot hot hot 2010 Hot in hot hot hot hot hot hot Nike air in hot hot.

C) radiation
and he. The conversion of thermal energy in an object into radiant heat energy (energy that radiates to the outside) and its transfer to another body. He, in turn, converts it into heat energy. Thermal rays are electromagnetic waves that are similar to light waves and differ from them in wavelength and are called ultraviolet rays, and thus they need a material medium through which they travel and thus the transfer of thermal energy occurs radiatively, even in a vacuum.

Benefits of thermal insulation
1- Rationalizing electrical energy consumption during cooling and heating operations, by up to 30-40%.

2- Protecting the structural elements of the building and preserving furniture from temperature changes

3- Raise the level of comfort and health safety of the building's occupants

4- Reducing the costs of purchasing air conditioning and heating equipment by reducing its capacity

5- Reducing environmental pollution, heat emissions and noise

Criteria for choosing suitable thermal insulation materials:

1- The insulating material should have a low thermal conductivity coefficient.

2- It must be of a high degree in its resistance to water and water vapor

3- To be of a high degree in its resistance to thermal radiation.

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4- To be of a high degree in its resistance to the stresses resulting from the large differences in temperature that lead to the mutual and continuous expansion and contraction. Which causes the loss of some important properties of the thermal insulation material.

5- It must have good mechanical properties, such as a high compressive strength coefficient and a coefficient of resistance to fracture.

6- To be fire resistant.

7- It should not result in harm, health, and be resistant to bacteria and mold and not subject to the growth of insects in it.

8- It should be dimensionally stable in the long term, with little ability to expand or contract under the influence of the surrounding weather and climatic factors.

9- To be resistant to chemical reactions and changes.

10- To be easy to install.

11- It must be in conformity with the Jordanian standard specifications.

Characteristics of thermal insulation materials:
The selection of a specific insulating material requires knowledge of its properties, which can be summarized as follows;

1- Physiological properties
Such as thermal conductivity property, thermal diffusivity, thermal shock resistance, thermal storage, emissivity, absorbency and specific heat, etc.

The coefficient of thermal conductivity of the material is considered one of the most important characteristics in which the thermal insulation material is distinguished and evaluated, and it shows the ability of the material to thermal insulation, so the lower this coefficient indicates an increase in the material’s resistance to heat transfer and vice versa. From this it becomes clear that the thermal resistance is inversely proportional to the coefficient of thermal conductivity of the thermal insulation material.

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