演講快訊

2021
11.05

Optical, Structural and Thermal Performances of Black Nickel Selective Coatings for Solar Thermal Collectors

Prof. Bhim Kafle

時間:2021年11月05日 (五) 15:10 PM
主持人:許蘇文 教授
講者:Prof. Bhim Kafle
服務單位:Department of Chemical Science and Engineering, Kathmandu University, Nepal
講題:Optical, Structural and Thermal Performances of Black Nickel Selective Coatings for Solar Thermal Collectors
地點:Online(Webex)

摘要 :

In the present study, the possibility of devising efficient and durable black nickel selective coating based solar thermal collectors (STCs) at ambient temperature was explored. For this, NASA electrochemical bath initially formulated by Peterson and Lin [Final Report: NASA-CR-149928, 1976] was employed. Quality of the STCs were optimized by evaluating pH, temperature, electric current density (Id) and deposition time (Td) dependence of optical, structural and thermal performance of the black nickel coating on the copper sheets and tubes. The optical measurements in the UV-Vis-NIR and NIR-MIR ranges inferred us that at pH ≈ 5.8, temperature in the range 20 - 25 OC, 2 mA/cm2 ≤ Id ≤ 4 mA/cm2 and 5min. ≤ Td ≤ 7 min. result in reasonably good black nickel coatings with optimal selectivity factor. Moreover, from the analysis of XRD spectra, for the first time we observed the significantly larger crystallites size of coatings on Cu sheets than that of the coating on tubes. Moreover, observed thermal performances (evaluated by measuring the collector efficiencies) indicate that the electro-deposited black nickel-based STCs were superior by more than 20% over black paint based STCs.

學經歷 :

MSc: Ben-Gurion University of Negev, Israel

 

PhD:  Graduate University for Advanced Studies, Japan

 

 

Postdoc: Weizmann Institute of Science, Israel

 

Assistant Professor: 2011-to date,  Department of Chemical Science and Engineering, Kathmandu University, Nepal

 

Research Field: Solar Technology: Mainly on Solar thermal and low cost organic solar cell Technologies