Effect of water radiator on air heating solar collector efficiency
2014
Aboltins, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Palabinskis, J., Latvia Univ. of Agriculture, Jelgava (Latvia)
The paper describes the results of the investigation, the aim of which was to find new air heating solar collector constructions to increase the collector efficiency especially at low solar radiation. The air heating degree at the same size and the same flowing through the air speed collectors with and without water radiator is compared. The results show a very strong correlation between the solar radiation and the water warm-up stage. It shows that the water radiator serves well to heat the air at low solar radiation (less than 300 W•mE-2). The water in the radiator heats up more than 30-35 degrees compared with the atmospheric air temperature. Solar radiation heats the water and it returns the stored energy to the flowing air when the solar radiation falls. Water temperature falls during the experiment indicate that the water accumulated solar energy is returned to the air flowing through the collector and warming it. The collector with the radiator average outlet temperature was 1.9 ºC higher than the same collector without the radiator during 9.5 hours working with average radiation 598 W•mE-2. The highest air heating solar collector efficiency η = 0.89 was achieved in the collector with the water radiator. Efficiency without a radiator was η = 0.62 at the same weather conditions. These researches show the applicability of air heated collectors with a water radiator for air heating at Latvia weather conditions.
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