Manufacturing and Study the performance of Selective Surfaces that used in flat plate Solar Collectors
Main Article Content
Abstract
In this research an experimental study has done for testing the thermal performance of selective surfaces used in solar collectors for substrate of iron, galvanized iron and aluminum which are commercially available. The coating process for the samples has done in two ways, the electroplating and the chemical spray pyrolysis. The results of the thermal performance test of these samples are comparing with the thermal performance of a sample without paint and other paint with black paint without shines commercially available. For the electroplated samples, the performance study has done for different immersion time in plating bath, the
distance between electrical poles, the current density, and area ratio of the sample plated area to the nickel pole face area. The chemical sprayed pyrolysis samples, study has done for different coating times, atomizing gas pressures, distance between the aperture of atomizer and the sample and the paint mass flow rate. The results showed that the best performance of the iron's
samples is the sample which is coated with two layers. The first layer is of zinc done by electroplating where the time of plating is (2 min.) and the second layer is of black nickel done by electroplating, where the time is (20 min.), the distance between the poles is (6 cm), the current density is (0.15 A/dm2 ) and area ratio of the sample plated area to the nickel pole face area is equal to (1). The percentage of the increasing in heat storage of electroplating sample to galvanized iron sample without paint at the beginning of testing the performance of samples and at the end were (58.23%& 44.97%) respectively. For aluminum samples, the best performance was regarded for two samples electroplating sample and chemical spray pyrolysis sample. The best electroplating sample was coated with a layer of black nickel where the time of plating is (20 min.), the distance between the poles is (6 cm), the current density is (0.15 A/dm2) and area ratio of the sample plated area to the nickel pole face area is equal to (1). While the best chemical spray pyrolysis sample has been coated with a layer of black nickel where the time of plating is (16 sec.) and the distance between the aperture of the reservoir and the surface of the sample is (27 cm), the amount of flow is (4.8 ml / min.), the atomizing gas pressure is (1 bar) and temperature of the sample surface is (290 0C).
Article Details
Section
How to Cite
References
- P.K.Gogna and K.L.Chopra,"Structure – dependant thermal and optical properties of black nickel coatings",Thin Solid Film, 57(1979)299-302. http://www.sciencedirect.com/science/article/pii/0040609079901676.
- M. Madhusudana and H.K. Sehgal ,"spray-deposited black nickel selective absorber surfaces for solar thermal conversion ", Applied 10(1982)65-74. http://www.sciencedirect.com/science/article/pii/0306261982900605.
- ىادي كاظم عوض، صالح محمد سعيد، جواد سممان البدري، عبد الكريم ىاشم الشالل، "األساسيات النظرية لمتحميل الكمي والوزني والحجمي لمكيمياء التحميمية الالعضوية "،مديرية دار الكتب لمطباعة والنشرـ الموصل )1982(.
- وزارة الصناعة والتصنيع العسكري ،المعيد المتخصص لمصناعات اليندسية ،"دليل الطالء الكيربائي لممعادن" ،دائرة التعامل الكيمياوي ،بغداد (1989) .
- S. John , "Black nickel-copper solar selective coatings", spie digital library, proc.SPIE, vol.2255,)1994(137-148.
http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=969218
-Wackelgard E. ,"Characterization of black nickel solar absorber coatings electroplated in a nickel chlorine aqueous solution ",Journal title , solar energy material and solar cells 56(1998) 35- 44. http://www.sciencedirect.com/science/article/pii/S0927024898001135