Wo niushan energy saving . . . A brief analysis of the design parameters of building thermal engineering.

The design of architectural heat engineering is complex and involves many proprietary noun concepts and calculation formulas. Today, we will select a few important parameters related to insulation for everyone to explain one by one.
is the thermal conductivity?
thermal conductivity, also known as thermal conductivity, means that under steady-state conditions and unit temperature differences, the thermal flow of materials per unit thickness, unit area homogeneity, usually expressed in the Greek letter, unit W/(m. K)

.
In layman's terms, the
thermal conductivity is the material's ability to conduct heat
, that is, 1m2 of unit area material, thickness of 1m, the temperature difference between the two sides is 1 oC, 1s from high temperature to low temperature conduction of heat, the value of which can be measured by test. Thermal conductivity is an important index of material insulation performance, the lower the value, indicating that the better the material insulation effect.
part of the common material thermal conductivity coefficient of
,
(Note: thermal conductivity is also related to temperature, that is, the same material at different temperatures measured by the thermal conductivity is also different, usually the test standard is based on 23 degrees C.) What
is the heat storage factor?
Heat storage coefficient, i.e. when one side of a homogeneity material layer of sufficient thickness is subjected to harmonic heat, the ratio of the heat flow amplitude through the surface to the surface temperature amplitude is usually expressed in the letter S, in W/(m2 k).
heat storage coefficient is a thermal characteristic of the material, colloquially speaking, the material's ability to store heat, the greater its value, the better the thermal stability of the material. For insulation materials, this indicator usually does not require testing. The relevant manual can be found for the heat storage coefficients of various commonly used materials with a thermal flow fluctuation period of 24 hours.
is the heat transmission coefficient?
heat transfer coefficient, i.e. under steady-state conditions, when the air on both sides of the enclosing structure is the temperature difference, the heat transmitted per unit of time passed through the unit area is usually expressed in the letter K, in units W/(M2 K). The heat transmission coefficient and the heat transmission resistance are incalculations, and the values can be obtained by calculation. In layman'
, the heat transfer coefficient is the ability of the enclosing structure to transfer heat
, the smaller the better.
map for the determination of heat transmission coefficients of the peri-enclosed structure
.
(1. metered heat tank; 2. the peri-enclosed structure under test; 3.cold box; 4. refrigeration unit; 5.controller; 6. A.indoor; B.outdoor. How
is thermal resistance?
thermal resistance, which is the physical amount that characteries the containing structure itself or the thermal capacity of one of the layers of material impedance, usually expressed in the letter R, in units of m2 k/W. If you add the air boundary layer on both sides as a whole, the definition becomes heat transfer resistance, usually expressed in the letter
R
0
.
simply put, thermal
is the material's ability to block heat transfer
values can be confirmed by the thermal conductivity calculation. For a material with a thickness of h, thermal resistance is numerically equal to the inverted value of the thermal conductivity coefficient, i.e. R.h./h.e.
.