Zinātniskās darbības atbalsta sistēma

## Publikācija: Optimization of the Solar Collectors Absorbers Parameters

Publikācijas veids Citas publikācijas konferenču (arī vietējo) ziņojumu izdevumos Nav zināms , English (en) Optimization of the Solar Collectors Absorbers Parameters 2. Inženierzinātnes un tehnoloģijas 2.7. Vides inženierija un enerģētika Voldemārs Barkāns Mārtiņš Jirgens Galina Kashkarova Kristina Ļebedeva Janis Shipkovs Peteris Šipkovs Mārtiņš Vanags solar collector, absorber, mathematical description The heat flow in the absorber of a solar collector, which occupies there a definite space and in which this heat spreads by conduction, is now being studied intensively. The process can be considered mathematically if we know the temperature at any time and any point of this space. There are cases when it is sufficient to measure the temperature at separate points and to tabulate the data obtained. However for a solar collector it is advantageous to preliminarily analyze the heat conduction thus considering the problem theoretically. Besides, the temperature not always can be measured at all points. The challenge is therefore to obtain the temperature function theoretically, depending on the time and spatial coordinates. Having obtained such a function we can use it further for mathematical modelling. This function will definitely contain some solar collector’s para¬meters, such as, e.g., the thickness of the absorber’s plate and the distance between the tubes (which are ideally connected by soldering to the absorber), the tube diameter, etc.; by varying these parameters in our mathematical model we can calculate the most optimal temperature condition in the absorber, making it possible to abandon a huge time-consuming and expensive experimental work for determination of the heat transfer from the absorber’s plate to the heat carrier flowing through the tube. Barkans, V., Jirgens, M., Kashkarova, G., Ļebedeva, K., Shipkovs, J., Šipkovs, P., Vanags, M. Optimization of the Solar Collectors Absorbers Parameters. No: 10th World Renewable Energy Congress – WREC X, Angilja, Glasgow, 19.-25. jūlijs, 2008. Glasgow: ELSEVER & WREC, 2008, 1871.-1873.lpp. 4182