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All Journal International Journal of Renewable Energy Development Jurnal Penelitian Pendidikan Indonesia
A. Munir
Department of Farm Machinery and Power, Faculty of Agricultural Engineering and Technology, University of Agriculture, Faisalabad, Pakistan
Chemistry Energy Other

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Thermo-economic Optimization of Solar Assisted Heating and Cooling (SAHC) System Ghafoor, A.; Munir, A.
International Journal of Renewable Energy Development Vol 3, No 3 (2014): October 2014
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.3.3.217-227

Abstract

The energy demand for cooling is continuously increasing due to growing thermal loads, changing architectural modes of building, and especially due to occupants indoor comfort requirements resulting higher electricity demand notably during peak load hours. This increasing electricity demand is resulting higher primary energy consumption and emission of green house gases (GHG) due to electricity generation from fossil fuels. An exciting alternative to reduce the peak electricity consumption is the possible utilization of solar heat to run thermally driven cooling machines instead of vapor compression machines utilizing high amount of electricity. In order to widen the use of solar collectors, they should also be used to contribute for sanitary hot water production and space heating. Pakistan lying on solar belt has a huge potential to utilize solar thermal heat for heating and cooling requirement because cooling is dominant throughout the year and the enormous amount of radiation availability provides an opportunity to use it for solar thermal driven cooling systems. The sensitivity analysis of solar assisted heating and cooling system has been carried out under climatic conditions of Faisalabad (Pakistan) and its economic feasibility has been calculated using maximization of NPV. Both storage size and collector area has been optimized using different economic boundary conditions. Results show that optimum area of collector lies between 0.26m2 to 0.36m2 of collector area per m2 of conditioned area for ieff values of 4.5% to 0.5%. The optimum area of collector increases by decreasing effective interest rate resulting higher solar fraction. The NPV was found to be negative for all ieff values which shows that some incentives/subsidies are needed to be provided to make the system cost beneficial. Results also show that solar fraction space heating varies between 87 and 100% during heating season and solar fraction cooling between 55 and 100% during cooling season which indicates a huge amount of conventional energy saving potential.
The influence of instructional leadership on learning motivation and student activity Afriza, Afriza; Syafaruddin, Syafaruddin; Nurhasnawati, Nurhasnawati; Khairina, Khairina; Munir, A.
JPPI (Jurnal Penelitian Pendidikan Indonesia) Vol 10, No 2 (2024): JPPI (Jurnal Penelitian Pendidikan Indonesia)
Publisher : Indonesian Institute for Counseling, Education and Theraphy (IICET)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29210/020243976

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In the context of acquiring foreign language competence, motivation plays an important role in determining the outcome of the learning process. This study explores the influence of instructional leadership on the motivation and learning activity of students in language learning at the Tanjung Berulak Islamic Madrasah Tarbiyah Pondok Pesantren (PPMTI). The study uses a quantitative correlational approach, with a population of as many as 620 students from PPMTI Tg. Berulak. The sample size of 71 respondents was determined using proportionate stratified random sampling. Data analysis includes validity testing of research instruments and regression analysis to measure the impact of instructional leadership on student motivation. The regression analysis resulted in a coefficient of 0.870, which indicates that the improvement in instructional leadership by one unit was linked to the increase in student motivation by 0.870. In addition, the study also found that motivation significantly affects student learning activity, with a significance rate counted below 0.05. The findings highlight the important role of instructional leadership in enhancing the motivation and active participation of students in language learning environments.
Co-Authors A. Ghafoor Afriza, Afriza Khairina Khairina, Khairina NURHASNAWATI NURHASNAWATI Syafaruddin Syafaruddin