Brochure
Solar Keymark brochure:
The Solar Keymark Brochure is available in several languages:
• Portuguese 2017 version (PT)
• Macedonian 2017 version (MK)
• Chinese 2010 version (Mandarin CN)
Articles
Collector performance parameters
The collector performance is described by the equation for the power output q:
- q = A*(n0*G - a1*dT - a2*dT²) [W]
with the operation conditions:
- G : Solar irradiance on collector plane [W/m²]
- dT: Temperature difference between collector mean fluid temperature and ambient air temperature [K] (Kelvin)
and the collector performance parameters:
- n0 : Optical efficiency
- Combined efficiency of the transparent cover and the absorber [-]
- a1 : 1st order heat loss coefficient
- Heat loss cofficient at collector fluid temperature equal to ambient temperature [W/K]
- a2 : 2nd order heat loss coefficient
- Temperature dependent term of heat loss coefficient [W/K²]
- The heat loss coefficient of a collector depends on the temperature. High values of a2 indicates large temperature influence
- The higher the value of a2 the more "hookednosed" the power/efficiency curve)
and the collector area:
- A: Collector area corresponding to the performance parameters
- Two sets of performance parameters are determined according to European Standard EN12975-2 - one set corresponding to the absorber area and one set corresponding to the aperture area. It is important to use corresponding area / parameters. Normally the aperture area is used, which is: The area through which the solar radiation enters the solar collector
Collector efficiency curves
Using the simple tools below, you can put in data for a collector and see the efficiency curve - and compare with typical collectors:
- Compare your collector with typical collectors: Download Excel-file
- Compare your collector with typical collectors: Run interactive file (requires Microsoft® Internet Explorer 4.01 Service Pack 1 (SP1) or later and the Microsoft Office XP Web Components)
Solar Keymark products
Solar Keymark News
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Solar Certification Fund: 12th call
Brussels, November 18th 2020 – The Solar Certification Fund (SCF) launched its 12th call for proposals to continue to provide regular and reliable support for:
Read more...