Thermal Insulation
Description
Thermal insulation refers to materials used for reducing the heat transfer rate or the processes and methods used for reducing the heat transfer. Thermal insulation helps to keep enclosed areas in buildings warm or alternatively can also keep the inside of a container cool. Heat transfer can occur by way of conduction, convection, or radiation. Thermal insulation is inversely proportional to the density of the material; gases are better insulators than solids. Materials used for thermal insulation include ceramics, epoxy or fiberglass, glass, polyimide film, glass wool, cellulose fibers, polyethylene, silicon rubber, polystyrene, wool, foam, rock wool, urethane foam, polyisocyanurate, and plastic materials. Proper insulation in buildings and industries reduces almost 50 percent of the energy costs.
Types
Based on applications, thermal insulation can be classified as follows:
Building thermal insulation
Window thermal insulation
Asbestos thermal insulation
Acoustic thermal insulation
Automotive thermal insulation
Specifications
The specifications to be considered for thermal insulation are listed below:
Use temperature - temperature range through which the insulating materials are exposed without affecting their end-use properties
Thermal conductivity - linear heat transfer per unit area for a given temperature gradient
Advantages
Some of the advantages of using thermal insulation are as follows:
Thermal insulation materials, such as glass wool and stone wool are extremely resistant to fire
Multi layer thermal insulation on buildings increases the insulation capacity
Applications
Thermal insulation have a diverse range of industrial and commercial applications such as in automotive, piping, chemical and pharmaceutical, pulp and paper, construction, marine, mining, oil and gas, food and beverages, space craft, cement, instrumentation, process control, electrical and electronics, power plants, water treatment plants, and fluid processing industries. Thermal insulation also find application in furnaces, foundries, air conditioning plants, air conditioning ducts, etc to reduce heat transfer and also to increase efficiency. In buildings, thermal insulation is done for ceilings, floors, crawl spaces, exterior walls and basements.