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FIRST AND SECOND LAW ANALYSIS OF A LABORATORY AMMONIA/WATER ABSORPTION HEAT PUMP
Moser, Harald,Rieberer, Rene The Society of Air-Conditioning and Refrigerating 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.2
At the Institute of Thermal Engineering, a small-capacity ammonia/water absorption heat pumping unit with about 5 kW cooling capacity has been constructed and tested in the laboratory. For all heat exchangers, standard plate heat exchangers have been used. The heat pump has been designed to operate in a wide operating range in order to enable different temperature levels for ice production, residential cooling, and heating applications. To identify potential for improvements, a thermodynamic analysis using both the first and the second law of thermodynamics has been carried out in order to locate irreversibilities associated with inefficient processes and to calculate the exergy loss of each component. Therefore the exergy losses of the main components have been separated into one part which is caused by the heat transfer and another part which originates from internal irreversibilities, e.g., from mixing processes. Furthermore, sensitivity calculations have been performed by varying the temperature levels of the heat sources and the heat sink in order to investigate the different component losses at different operating conditions. The results show that the component exergy losses depend particular on the temperature level of both the heat sources and the heat sink. At low temperature lifts, the exergy losses of the absorber and generator are dominant and with increasing temperature lift, the exergy losses of the dephlegmator and the rectification column become considerable.
Jason Moser 아시아영어교육학회 2017 The Journal of Asia TEFL Vol.14 No.4
This paper reports on the introduction of in-class self-directed learning in an intensive English program at a woman’s university in Japan. This self-directed learning was organized around can do descriptors, and supported by a portfolio and formative assessment. This new curriculum emerged from our use of the CEFR. A second reason for this change stemmed from an increased lack of student engagement during teacher-directed instruction. For self-directed learning, a student determined what can do’s she wanted to learn, and what activities she would study to learn these skills. This student control also involved deciding what can do’s to be individually tested on and when. At the end of the academic year, students (n = 37) completed a 12-item Likert scale survey to assess the curriculum changes. The results revealed that students had mixed support for self-directed planning. Specifically, students indicated a lack of confidence in making study plans. Students did like the use of can do’s, but wanted more language guidance for them. Students also strongly favored the use of the portfolio and formative assessment. An analysis of student can do test results for the year revealed that students made greater gains than were possible with the prior teacher-directed curriculum.
FIRST AND SECOND LAW ANALYSIS OF A LABORATORY AMMONIA/WATER ABSORPTION HEAT PUMP
HARALD MOSER,RENÉ RIEBERER 대한설비공학회 2010 International Journal Of Air-Conditioning and Refr Vol.18 No.2
At the Institute of Thermal Engineering, a small-capacity ammonia/water absorption heat pumping unit with about 5 kW cooling capacity has been constructed and tested in the laboratory. For all heat exchangers, standard plate heat exchangers have been used. The heat pump has been designed to operate in a wide operating range in order to enable different temperature levels for ice production, residential cooling, and heating applications. To identify potential for improvements, a thermodynamic analysis using both the first and the second law of thermodynamics has been carried out in order to locate irreversibilities associated with inefficient processes and to calculate the exergy loss of each component. Therefore the exergy losses of the main components have been separated into one part which is caused by the heat transfer and another part which originates from internal irreversibilities, e.g., from mixing processes. Furthermore, sensitivity calculations have been performed by varying the temperature levels of the heat sources and the heat sink in order to investigate the different component losses at different operating conditions. The results show that the component exergy losses depend particular on the temperature level of both the heat sources and the heat sink. At low temperature lifts, the exergy losses of the absorber and generator are dominant and with increasing temperature lift, the exergy losses of the dephlegmator and the rectification column become considerable.