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- 저자 : Rieberer, Rene (검색결과 5 건)
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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.
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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.
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( Thi Anh-dao Tran ),( Diadie Diaw ),( Arsene Rieber ) 세종대학교 경제통합연구소 2012 Journal of Economic Integration Vol.27 No.3
This paper aims at analyzing how export performance of developing countries differs across destinations. With application to Sub-Saharan Africa and Asia, we first employ a gravity equation to break down each region`s export performance, separating the contribution of foreign market access from internal supply capacity. Then, we identify the key determinants of countries` export performance, both theoretically and empirically. Our contribution is to introduce demand spillovers that help market access to improve supply conditions. Regression reveals a positive interaction between the two components, with a higher elasticity of exports with respect to market access in the particular case of South-South trade flows.
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Vietnam's Long-run Growth: Connecting the Dots through Climate Damage Spillovers
Elodie Mania,Thi Thu-Ha Nguyen,Arsène Rieber,Thi Anh-Dao Tran 세종대학교 경제통합연구소 2024 Journal of Economic Integration Vol.39 No.1
We propose to examine how climate damage may transform Vietnam's long-run growth rate. Because of cross-country linkages forged by bilateral trade, there are two channels through which international damage spillovers may occur. First, the dynamics of partners' growth determine future trends in Vietnam's volume of exports. Second, since the domestic impact of climate change may be heterogeneous across countries, there will be a differentiated impact on export and import market shares. Both terms play a critical role in changing trade patterns that are likely to shift Vietnam's external constraint. This demand-side view of growth based on the balance-of-payments constraint is a powerful predictor of inter-country growth differences. Our study show that the consequences of climate change could equate to a 2.5% reduction in Vietnam's growth rate over the period 2020-2060. Our decomposition exercise by effect and by partner area shows that international damage spillovers result from very different individual behaviours.
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Microtechnologies in medicine: An overview
Schurr, Marc O.,Schostek, Sebastian,Ho, Chi-Nghia,Rieber, Fabian,Menciassi, Arianna 0 2007 MINIMALLY INVASIVE THERAPY AND ALLIED TECHNOLOGIES Vol.16 No.2
<P> Microsystems technology (MST) has become a significant enabler of novel medical devices and implants over the last years. Typical examples are MST units in cardiac rhythm management devices or in hearing implants. A classification of medical MST applications can be made according to their relationship with the anatomy that is based on the kind and duration of interaction with the human body: Class 1: Extra-corporeal devices such as telemetric health monitoring systems or point of care testing systems. Class 2: Intra-corporeal devices such as intelligent surgical instruments. Class 3: Temporarily incorporated or ingested devices, such as telemetric endoscopes. Class 4: Long-term implantable devices such as telemetric implants. Medical applications of MST are growing at double-digit compounded growth rates, leading to a forecasted global market volume of over USD 1 billion in 2006 or 2007, making MST devices a relevant segment of the medical technology market. The clinical foundation for promoting the use of MST in medicine is mainly based on the significant potential of MST to enable products that improve early disease detection and the monitoring of chronic illnesses. This refers to a number of the most important health problems such as cardiovascular disease, hypertension, diabetes and cancer, to name just a few. More recently microrobotics has become a relevant research area for enabling the atraumatic transport of MST-enhanced diagnostic and therapeutic devices inside the human body.</P>
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