Principles and cases of building thermal insulation coatings participating in energy-saving calculations!

Guide

At present, the world's energy shortage problem is becoming more and more serious, and all walks of life have higher and higher requirements for energy conservation and emission reduction

1.

Building thermal insulation is one of the important measures to reduce energy consumption.

Architectural reflective insulation coating applied to roof

Second, the principle of participation in energy-saving calculations of building thermal insulation coatings

Before understanding the principles of building reflective thermal insulation coatings participating in energy-saving calculations, you must first know the concept of equivalent thermal resistance.

Two scenarios for applying architectural reflective thermal insulation coatings:

1) Prescriptive index calculation (considering equivalent thermal resistance)

The heat transfer coefficient of the external wall or roof should adopt the equivalent thermal resistance and be calculated according to the following formula

Among them:'-The heat transfer coefficient of building reflective insulation coatings used on exterior walls or roofs ()

The heat transfer coefficient of building reflective insulation coatings that are not used for exterior walls or roofs ()

The equivalent thermal resistance [()/W] of exterior wall or roof using architectural reflective insulation coating [()/W] (this value is taken from the industry standard architectural reflective thermal insulation coating application technical specification JGJ/T359-2015 or local architectural thermal insulation reflective coating application technology Procedures)

2) Adopt energy-saving comprehensive index method-weighing calculation (considering the solar radiation absorption coefficient after pollution correction)

When the external wall or roof adopts the energy-saving comprehensive index method for energy-saving design, the solar radiation absorption coefficient after pollution correction should be used to calculate the building energy consumption index

Note: Since the equivalent thermal resistance is considered in the calculation of the prescriptive index, and the solar radiation absorption is directly considered when calculating the building energy consumption index, it is necessary to avoid repeated considerations when weighing the calculation.

Therefore, you can draw a conclusion from the above calculation principle: architectural reflective thermal insulation coatings have no concept of thermal conductivity, and thermal resistance is not calculated by thermal conductivity

3.
The effect of thermal insulation of building thermal insulation coating (case)

1.
Calculation model

Project Type: Residential

Project location: Changsha

Building floors: 11 floors

Body shape factor: 0.
36

2.
Calculation of prescriptive indicators

Architectural reflective thermal insulation coating is not used: the internal thermal insulation thickness must reach 40mm

Architectural reflective insulation coating: the internal insulation thickness is only 25mm