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Performance evaluation of novel solarpowered domestic air cooler with Peltier modules
Zafar Abbas,A. N. Shah,M. Tahir Hassan,M. Sarfraz Ali,Qamar ud Din,Bilal Naseem,Ammar Asghar,Ali Haider 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11
Shifting of air conditioning and ventilation plants from conventional to renewable energy systems is one of the effective ways to save energy and attain sustainability. In this experimental study, an effort has been made to design, fabricate, and evaluate the cooling performance of a solar-powered domestic air cooler with Peltier plates to meet the comfort criteria as per ASHRAE standards. It also investigates the effect of Peltier modules on the performance of conventional room air cooler. The experiments were conducted in a 12x12 room with one, two, three, and four Peltier modules operating at various ambient temperatures. The experiments were repeated three times at specified conditions. Peltier effect was used to decrease water temperature, and subsequently cooled water was used to decrease the temperature of the air after coming in contact with this water. The cooled air was then used to create a comfort zone. The results indicated a decrease in temperature of the experimental zone by 5 %, 13 %, 19 %, and 23 % using one, two, three, and four Peltier modules respectively. The increase in relative humidity was recorded as 5 % at 27 °C temperature of the experimental zone. The results of energy analysis showed a substantial amount of energy savings in this study and suggest that more than 200 MW energy can be saved by replacing conventional electric air coolers all over the country with proposed Peltier based domestic solar powered air cooler.
Morphology controlled facile synthesis of MnO2 adsorbents for rapid strontium removal
Umar Asim,Syed M. Husnain,Naseem Abbas,Faisal Shahzad,Abdul Rehman Khan,Tahir Ali 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
MnO2 nanostructures with three distinct architectures, namelyflower, balk and tube-like, have beensynthesized through a single step microwave assisted hydrothermal method at different reactiontemperatures (110 C, 140 C and 180 C). The characterization of as prepared MnO2 samples wereperformed by means of Fourier transform infrared spectroscopy, X-ray diffraction, scanning electronmicroscopy, and transmission electron microscopy. The N2 adsorption–desorption isotherms revealedthe higher specific surface area and porosity of theflower like MnO2 as compared to balk and tube-likeMnO2. The adsorption behavior of as prepared adsorbents was investigated towards Sr2+ radionuclide. Because of the hierarchal structure and the high surface area (62.64 m2/g), MnO2-110 depicted the bestSr2+ adsorption performance with maximum adsorption capacity of 52 mg/g at pH 6 as compared to otherMnO2 morphologies synthesized at 140 C and 180 C. The kinetic studies revealed that the adsorption ofSr2+ onto MnO2-110 followed the pseudo-first-order model whereas the adsorption equilibrium dataobeyed the Freundlich and Sips model. Moreover, the MnO2-110 adsorbent reached the steady statequickly ( 10 min) and is capable to bind Sr2+ in slightly acidic to alkaline solutions.
Badshah, Mohsin Ali,Ju, Jonghyun,Lu, Xun,Abbas, Naseem,Kim, Seok-min Elsevier 2018 Sensors and actuators. B Chemical Vol.274 No.-
<P><B>Abstract</B></P> <P>Metal-enhanced fluorescence (MEF) has significant potential to increase the sensitivity of fluorescence detection by allowing fluorophores to interact with enhanced electromagnetic fields generated by the localized surface plasmon resonance effects of metallic nanostructures. In this study, the MEF of silver (Ag) vertical nanorods (VNR) arrays fabricated by glancing angle deposition were studied for a DNA microarray. To maximize the enhancement effect of Ag-VNR, Ag-VNR arrays with various lengths were fabricated, and fluorescence signals from the Ag-VNR substrates were measured and compared to glass and commercial Amine slides (Amine 2®, Array-it, USA). For the fluorescence signal measurement, Cy5-conjugated Kallikrein-related peptidase 7 (KLK-7-Cy5) DNA probes were spotted on each substrate, and their fluorescence signal was measured after blocking and washing processes. A maximum enhancement factor 200× that of the glass substrate was obtained from a Ag-VNR with 500 nm length and was 36 times greater than the commercial Amine slide.</P> <P><B>Highlights</B></P> <P> <UL> <LI> GLAD is simple and effective technique for fabricating large area substrates. </LI> <LI> Significant fluorescence enhancement was observed on vertical nanorod substrates. </LI> <LI> A maximum enhancement factor of ∼200X was achieved on 500 nm long nanorods substrate. </LI> </UL> </P>
Muhammad Hayat,Nadeem Raza,Umair Jamal,Suryyia Manzoor,Naseem Abbas,Muhammad Imran Khan,Jechan Lee,Richard J. C. Brown,김기현 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
As a key member of benzoylurea insecticides, lufenuron exhibits a strong potential for bioaccumulationin ecosystems. Here, we report the synthesis of a molecularly imprinted polymer (MIP) and its applicationfor selective extraction of lufenuron from agricultural runoff samples. The morphology and thermalstability of the prepared MIP was characterized by SEM and TGA, respectively. The experimental conditionsfor lufenuron detection were optimized through batch binding assay and response surface methodology(RSM). The MIP showcased a two-fold enhancement in binding capacity of lufenuron (74 mg g1)relative to non-imprinted polymer (36 mg g1), when measured through batch binding assay. Using aRSM based on central composite design, the qe value was predicted as 73.6 mg g1 under optimal experimentalconditions (e.g., pH 8). Furthermore, the percentage recovery of lufenuron was estimated as98.8 ± 1.8% (n = 9). The adsorption kinetics of the MIP followed the pseudo-first-order model with v2value of 0.004 (correlation coefficient of 0.99). The limit of detection for lufenuron using MIP-basedmethod was 3 106 mg mL1. There was no significant decrease in the performance of MIP against lufenuronover five successive cycles.