Abstracts – Browse Results
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Badu, E, Edwards, D J and Owusu-Manu, D (2012) Trade credit and supply chain delivery in the Ghanaian construction industry: Analysis of vendor interactions with small to medium enterprises. Journal of Engineering, Design and Technology, 10(03), 360-79.
Chileshe, N and Yirenkyi-Fianko, A B (2012) An evaluation of risk factors impacting construction projects in Ghana. Journal of Engineering, Design and Technology, 10(03), 306-29.
Garg, H C (2012) Theoretical modelling of orifice compensated symmetric hole-entry hybrid journal bearings. Journal of Engineering, Design and Technology, 10(03), 421-35.
Li, H, Guo, H L, Kong, S C W and Chen, Z (2012) Optimization of curved roof surface design using GA. Journal of Engineering, Design and Technology, 10(03), 345-59.
Simon, M and Meyer, E L (2012) Low cost I-V system employing variable power supply unit as an electronic load. Journal of Engineering, Design and Technology, 10(03), 330-44.
- Type: Journal Article
- Keywords: current-voltage curve; electric current; photovoltaic system; power supply; voltage
- ISBN/ISSN: 1726-0531
- URL: https://doi.org/10.1108/17260531211274701
- Abstract:
Purpose – The purpose of this paper is to design and construct a low-cost current-voltage tester, bearing in mind the short falls of the existing testers and the ever-increasing price of the testers currently on the market. The I-V tracer presented in this paper uses a variable external power supply unit (PSU) as the load, in order to obtain the entire operating range of a PV module from open circuit through maximum power to short circuit condition. Design/methodology/approach – The I-V tracer presented in this paper was divided into three main sections, mainly the data acquisition system (DAS), which comprises an A/D computer card, temperature card, electromechanical relays, current and voltage transducers, aluminum housed resistors and power MOSFETS, the variable load (programmable variable PSU) and finally the signal processing unit. These components were integrated and finally interfaced to a PC. Findings – The results obtained using this system compared with the capacitive tester show a low percentage difference of <1 from the comparative I-V curves measured. The results measured by the PSU tester are also of high accuracy. The findings also demonstrated the fact that most of the components found in most university laboratories can be used to build the PSU tester and still obtain highly accurate results. Research limitations/implications – Since some components are semiconductors, which have a limited lifetime, they need to be changed if they fail. Mostly the MOSFETS should be replaced when no switching signal is sent. Practical implications – This low-cost PSU tester is suitable for researchers in disadvantaged institutions whose research capabilities are limited due to the high cost of this equipment. Originality/value – The PSU tester uses a variable power supply as the load to measure PV module I-V curves. The system is capable of measuring up to eight modules at the same time, making it possible to analyze PV modules within the same time frame.
Spillane, J P, Oyedele, L O and Meding, J v (2012) Confined site construction: An empirical analysis of factors impacting health and safety management. Journal of Engineering, Design and Technology, 10(03), 397-420.
Vinodh, S, Selvaraj, T and Praveen, T (2012) Design and development of agile product development cycle for rotary switches. Journal of Engineering, Design and Technology, 10(03), 380-96.