Other related to adiabatic, what does adiabatic mean?

In a physical sense: adiabatic is the thermal process in which matter has no heat exchange with the outside world.

Thermal insulation is the process of reducing heat transfer as much as possible, and the popular point is: adiabatic is idealized (there are many idealized models in physics, such as particle electric field lines, which can hardly be realized; And heat preservation is to find a way to reduce heat dissipation, but it will still dissipate heat.

Adiabatic process. The adiabatic process is the process in which there is no heat exchange between the system and the environment during the state change. In fact, there is no real adiabatic process, but the state change process that occurs in a closed container with good thermal insulation performance can be approximated as the adiabatic process stuffy round belt.

Sometimes, although the insulation performance of the container is not very good, the state change process or chemical reed reaction in it.

This can be done in a very short period of time, during which the heat exchange between the system cavity and the environment is very small due to the short time, and this process can also be approximated as an adiabatic process if necessary.

Adiabatic is to guess the boundary of an object if there is no way of heat transfer in any form.

In industrial production, the good thermal insulation of equipment can greatly reduce energy loss and improve production efficiency. According to the theory of adiabatic insulation, the thermal insulation materials made by the study of the heat loss performance of materials have a wide range of applications. The adiabatic process is a change process of the adiabatic system, which is a system that has no heat and particle exchange with the outside world, but has other forms of energy exchange, which belongs to a kind of closed system.

Process features:

Adiabatic processes are divided into reversible processes (entropy increase.

zero) and irreversible processes (entropy increases non-zero). The reversible adiabatic process is an isentropic process. Isentropy is the opposite of the omen of fortune.

It is an isothermal process in which the maximum amount of heat is transferred to the outside world, so that the temperature of the system is constant as usual. Due to the thermodynamics.

, temperature and entropy are a set of conjugate variables, and isothermal processes and isentropic processes can also be regarded as a pair of "conjugated" processes.

If a thermodynamic system changes fast enough to ignore heat exchange with the outside world, this process can be considered adiabatic, also known as a "quasi-static process". Strictly speaking, in thermodynamics, there is no strict distinction between quasi-static and reversible processes, and they are used as synonyms in some literature. Use.

Thermal insulation materials refer to materials or material complexes used for building envelopes or thermal equipment, impedance heat flow transfer, including both thermal insulation materials and cold insulation materials. On the one hand, thermal insulation materials meet the thermal environment of building spaces or thermal equipment, and on the other hand, they also save energy.

According to the principle of thermal insulation, thermal insulation materials are divided into: porous materials, which are filled with gases with low thermal conductivity and insulated in the pores. Generally, air is used as the thermal resistance medium, mainly fiber aggregate tissue and porous structure materials.

The finer the fiber diameter and the smaller the bulk density of the material, the better the thermal insulation performance. The thermal conductivity of the closed cell structure is lower than that of the open cell structure, for example, when the closed cell structure is filled with other gases with smaller thermal conductivity values, the thermal conductivity of the two structures is quite different. Foam plastic has good thermal insulation, followed by mineral fiber, expanded perlite and porous concrete, foam glass, etc.; Reflective materials, such as aluminum foil, can greatly reduce radiation heat transfer by heat reflection, and several layers of aluminum foil or paper form a composite structure with a thin layer of air, which can also increase the thermal resistance value.

According to the structure of thermal insulation materials, they are divided into: fibrous aggregate tissues (inorganic or organic fibers and products); loose granular, flaky or powdery structures (e.g., light aggregates, pumice, diatomaceous earth); Porous structures (porous concrete, foam, etc.) and dense structures (aluminum foil, etc.). Thermal insulation materials can also be made according to the raw materials, density, hardness, thermal conductivity and make.

Because air is used as the thermal resistance, the general insulation materials have been loose and porous structure. So it's all lightweight.

If the heat is not lost, it is adiabatic.

Adiabatic insulation is to isolate and prevent the transfer, loss and convection of heat, so that the temperature or heat in the area is not affected by the outside world or cannot be affected by the outside world and keeps the internal stability or changes independently.