Browsing by Author "Nadzri, N. F. A."

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    Comprehensive passive-mode performance analysis on a new multiple-mode solar still for sustainable clean water processing
    (Elsevier, 2022) Abimbola Tijani Oladoyin; Takaijudin, H.; Singh, B. S. M.; Yusof, K. W.; Abdurrasheed, A. S.; Al-Qadami, E. H. H.; Isah, A. S.; Wong, K. X.; Nadzri, N. F. A.; Ishola, S. A.; Owoseni, Tunji Adetayo
    The solar still is potential to augment clean water supply in the rural and low-income settlements. However, the current efficiency of the device is low. In this study, we report the fabrication and experimental performance analysis of a high-efficiency multiple-mode solar still—tagged Desal-1.5. The solar still was investigated in passive mode, relying entirely on natural insolation. Both desalination and ordinary water purification experiments were conducted on the device using seawater and moderately polluted lake water, respectively, between 09:00 and 18:00 h of Malaysia's tropic weather. The optimum freshwater yield of the prototype within the interval was 5780.5 ml/m2, while the optimum solar-to-vapor conversion efficiency, evaluated using the transient latent heat of vaporization, was 161.4%. Furthermore, for the first time on a solar still geometry, condensate loss due to condensate collection channel slope has been estimated in this study for our Desal-1.5. The loss amounted to 18.5% of the actual condensate collection. Eventually, water quality assessments of distillates from the device showed good compliance with both WHO and Malaysian drinking water standards. Thus, the recommendation of the solar still to ameliorate freshwater scarcity and support sustainable clean water provision in the rural and low-income regions is strengthened.
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    Condensate loss estimation and transient solar-to-vapor conversion efficiency for effective performance evaluation of the inclined solar still
    (Elsevier, 2022-02-01) Abimbola, T. O.; Takaijudin, H.; Singh, B. S. M.; Yusof, K. W.; Abdurrasheed, A. S.; Al-Qadami, E. H. H.; Isah, A. S.; Wong, K. X.; Nadzri, N. F. A.; Ishola, S. A.; Akilu, S.; Owoseni Tunji Adetayo
    Previously, freshwater yields of the solar still were quantified only based on the actual distillate recovery, not considering condensate losses by any means. Likewise, solar-to-vapor conversion efficiencies of the solar still were conventionally considered and evaluated as one-off -rigid values- based on the latent heat of the average water temperature. In most cases, these approaches do not give a comprehensive performance details of the solar still. Thus, we suggest two considerations for effective performance evaluation of the inclined solar still. The first consideration is theoretical estimation of the condensate loss due to the condensate collection channel slope, while the other is the use of a transient method to evaluate the solar-to-vapor conversion efficiency. We demonstrated, geometrically, that the condensate loss on the inclined solar still can be significant—hence the need to consider it alongside the overall yield. We formulated a model to estimate the condensate loss and validated the model by comparing an estimated condensate loss with experimental loss. Similarly, we demonstrated a transient approach to evaluate the solar-to-vapor conversion efficiency by using the latent heat of the hourly water temperature. Accordingly, the optimum hourly efficiency of the investigated solar still prototype was 161.4%, with a daily average of 113.4% versus 108.4% from the conventional method. Overall, no study on the solar still had previously accounted for condensate losses by any means whatsoever, making our current study a reference and a pioneer in this concept and suggesting an advancement in the approach to report the performance productivity of the solar still.