How to Calculate Irradiance

 

In optics, irradiance is the power per unit area of electromagnetic radiation incident on a curved surface. Radiant emittance (radiant exitance) is the power radiated from a surface per unit area. Using the International System of Units, the units of these physical quantities are watts per square meter (W/m2). Irradiance is a crucial parameter in the Xenon Arc Tester. Many people will be curious about its calculation. Here is an introduction to how to calculate it.

What is the total annual solar radiation?

The total annual solar radiation: the accumulation value of solar radiation which reach the ground at per unit area in one year.

The total annual solar radiation of each country is different.

Due to more clouds and rain near the equator, so the high value area of total annual solar radiation is not at equator, but at nearby latitude 20º. The global maximum value area is in southern Egypt, about 9200MJ.

How to convert?

Parameters
  • The radiation power in YG611T is 49000μW/m2, 49000μW/m2=490W/m2
  • Sample area: 1 m2
  • Testing time: 1 hour
Calculations of Irradiance
  • Energy effected on sample in one hour
1 m2×490 W/m2×60min×60s=1764000J=1.76MJ
  • Energy effected on sample in a month
1.76MJ×24hours×30days=1267MJ
Conversions
  • In south China, the average value of total annual solar radiation is about 5000 MJ (this value you can consult with domestic related departments). The average value of monthly is 5000MJ÷12≈420MJ.
  • 1267MJ÷420MJ≈3, so we can conclude that sample in YG611T 1 hour equal in sunlight 3 hours, in chamber is 3 times in outdoor.

Bench Xenon Arc Tester

Bench Xenon Arc Tester, also called colorfastness Weathering Test Equipment, which is suitable for new materials applied in different environment, it is used for the quality control of materials and components, production of conventional test, etc. Filtered xenon lamp can be used as accurate simulation of solar radiation.
Search for more details

Comments

Post a Comment

Popular posts from this blog

Combing Process in Spinning

Image
Before processing cotton, wool, and silk fibers into fabrics, the process of removing impurities and short fibers in the fibers with a combing machine is called combing. The texture, washability and durability of the fabric produced through this process are greatly improved compared with carded fabrics. The following introduces the composition of the combing machine and the combing process. The kinematic coordination relationship of the main parts on the combing machine is indicated by a dial. The disc is mounted on the combing machine and rotates synchronously with the cylinder, which is generally called the indexing disc. The index plate is divided into 40 equal parts along the circumference, and each equal part is 9°, which becomes one index. The working cycle refers to the time interval between the combing cylinder of the intermittent combing machine corresponding to the two actions of combing the whiskers. That is: the first row of needles in the combing cylinder goes to the botto
Read more

Twist Test Methods and Influencing Factors

Image
  Twist test is an important part of yarn inspection. It is related to the strength, elongation, appearance, style, etc. of yarns and fabrics. Different yarns have different structural characteristics, and their twist testing methods are also different. Basic concept To understand twist testing, you must first understand what twisting is. Twisting is a necessary condition for yarn formation. Short fibers can be made into yarns with certain physical and mechanical properties through twisting; filaments often need to be twisted in order to increase the tightness between single filaments, facilitate processing, and improve fabric properties. Number of twists Twisting is to cause two cross-sections of parallel straight fiber slivers to rotate relative to each other. The number of relative rotations of the two cross-sections is called the number of twists. Twist Twist refers to the number of twists per unit length of yarn . Twist coefficient In actual production, the twist coefficient is of
Read more

Garment Dyeing-Special Dyeing Method In Textile

Image
Garment dyeing is a relatively special dyeing process for textiles and garments. Many people may not know much about this dyeing process. In the impression of most people, textile and clothing products are dyed in the fabric period, and garment dyeing is a dyeing process that breaks people’s cognitive limitations on textile dyeing. ​What is garment dyeing ​Garment dyeing means that dyeing the one not in the fabric type but in the garment type itself. The garment type mentioned above include socks, towels, sportswear, shirts, plush toys (without fillers), T-shirts, pants, bathrobes, handkerchiefs, bath mats, carpets, scarves, etc. The material of these garments can be wool, linen, silk and cotton of natural fibers. But most garments are made of cotton or a cotton-rich blends. Garment dyeing imparts vibrant colors to garments. The clothes such as denim garments, tops, sportswear and casual clothing with garment dyeing can provide a distinctive special effect. Garment dyeing method Garmen
Read more