ICACT–2021
Permanent URI for this collectionhttp://repository.kln.ac.lk/handle/123456789/24483
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Item Use of Early Semester Student Feedback for Enhancing Effectivness of Teaching and Learning(Faculty of Computing and Technology (FCT), University of Kelaniya, Sri Lanka, 2021) Nissanka, Indrajith D.; Nandasiri, Gayani K.Student feedback in basic engineering modules is important, as the module involves the application of theory into practice. The feedback is used to assess the teaching and learning process at the end of the semester, which is the current practice. This mainly focuses on summative assessment through quantitative scores, where feedback is addressed in subsequent academic years. The early semester feedback can be used to improve the teaching and learning process within the semester itself. It can be designed as formative feedback, focusing on meaningful improvement of the teaching and learning. Hence, it is explored whether early semester feedback can be applied for enhancing the effectiveness of teaching and learning process. In this study, early semester feedback was obtained for the Basic Thermal Sciences module from a selected sample size of 122 students representing two engineering disciplines of the same semester of study. The feedback was collected in two stages of the semester using both paper and Moodle based online questioners. The feedback survey was designed in two sections: the first section provided for quantitative evaluation using rating questions while the second included open-ended questions to obtain qualitative feedback. Survey results depicted students’ selfassessments on their learning and the suggestions for improving the teaching and learning process. The feedback provided diagnostic information on the key changes to be adopted in teaching, that resulted in improved student engagement and performance. Almost 90% of the students responded that their interest was valued, and they felt inclusive in the class while 80% of students were of the impression that class materials are relevant to their professional practice. Also, the subsequent assessment has shown a 10% increase in the average marks for group assignments. It was evident that the students were appreciative of taking the early semester feedback, and it helped to improve the inclusiveness of the student’s requirements into the module.Item Evaluation of Cooling Techniques for Personal Cooling Garments in Hot and Humid Climates(Faculty of Computing and Technology (FCT), University of Kelaniya, Sri Lanka, 2021) Fernando, D.O.D.P.; Ahmad, A. N.; Nandasiri, Gayani K.; Nissanka, Indrajith D.Personal cooling garments have become a major requirement to cater thermal discomfort, caused mainly due to the rise in global temperatures. Various cooling techniques have been used for specific applications, mainly focused on thermal protection than thermal comfort. Thermoelectric cooling, phase change materials, and evaporative cooling techniques were selected and further analyzed through mathematical modeling to assess their suitability for personal cooling garments. Phase change materials can provide 2 hours of cooling using 46 capsules, while evaporative cooling can provide cooling for 36.1 minutes and thermoelectric cooling can provide continuous cooling. The study concluded that a combination of thermoelectric cooling with phase change materials could remove required heat from the top part of the body which is emitted during medium level activities. Two circuits, each with three Peltier modules of the TEC1-127 series supplied with a direct current of 1.5A and supplied voltage of 9V could provide efficient heat pumping ability, with the coefficient of performance of 1.17 each. The macro capsules with eicosane as the core material act as the heat sink when used in combination with thermoelectric modules. Hence, it concludes that a combination of thermoelectric modules with phase change materials integrated into a personal cooling garment could effectively provide the required thermal comfort.