Residential housing is a critical aspect of human living and in developing countries this is a mirage due to high cost of building materials. In order to meet the needs for affordable housing with low cost materials as well as meet required fire safety standards, this research developed flame retarded fibreboards with oil palm residue reinforced in polyester resin, incorporating 0, 12 and 18% flame retardant loading using hand lay-up compression moulding. The fibreboards were tested for impact, thermal and flammability properties. Based on experiments, it was found that 12% aluminum tri-hydroxide fibreboard meets the impact and thermal limitations while the 18% hybrid formulation meets the required fire safety standard for building interior applications which will benefit rural dwellers in Nigeria and in similar climes around the world seeking to substitute conventional materials with the advantage of low cost, easy to process, biodegradable, environmentally benign and flame retarded composite material.
This article presents an assessment of total harmonics effects on grid-connected powered inverter using sine-referenced and static-band hysteresis of current controllers. To realize this art, current transducer, static-band and sine-referenced hysteresis current controllers, solar energy source, maximum power point tracker, grid supply and voltage source DC-AC converter are engaged. The system has these features are: (i) Light weight owing to none transformer-less system application (ii) Efficient in injection of power Under static-band hysteresis current controlled fed-back system, at upper and lower bands of 130Vand 50V, a total harmonic distortion, THD of 1.815% and output voltage, vo of 220Vrms (320V peak) were realized whereas in sine-referenced band hysteresis current controlled fed-back system at upper and lower bands of 430V and 340V, a THD of 1.019% and vo of 220Vrms are released. The computer simulations and spectral analyses of the system were presented
This paper presents performance evaluation of varying triggering angles on single-phase semi bridge controlled AC-DC Converter, which are, dependent on the deferment angles. This article is meant for adequately identifying the better range of deferment or delay angles for controlled rectification for optimal performance of the single-phase half wave AC–to-DC converter. The single-phase half wave controlled rectifier is formed by combination of thyristor power switch, power cables and triggering circuit in the presence of supply voltage and the load/s. This article is also used to find out the levels of total harmonic distortions, amplitudes and the nature of the output voltage of single-phase half bridge controlled rectifier at varying firing angles. It also presented the clear convenient range of firing angles to be used for AC-DC rectified based appliances that have not been shown in other work done online in this perspective. The overall system is modeled and simulated in MatLab 2018. The outcomes of the investigations are that: (i) the best operating ranges of triggering actions occurred after delay angles of 15∘ and 30∘, (ii) the output voltage or current of the rectifier after delay angles of 15∘ and 30∘ needs small size of filter components, (iii) the proposed system has low harmonic distortions after delay angles of 15∘ and 30∘ (iv) at delay angle of 180∘, the output of the system turned in complete AC waveform that are detrimental to connecting it directly to DC loads, hence complete avoidance of operating after delay angle of 180∘.
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