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- 저자 : BIDYUT BARAN SAHA (검색결과 4 건)
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FUEL CELL WASTE HEAT POWERED ADSORPTION COOLING SYSTEMS
SEUNG TAEK OH,BIDYUT BARAN SAHA,KEISHI KARIYA,YOSHINORI HAMAMOTO,HIDEO MORI 대한설비공학회 2013 International Journal Of Air-Conditioning and Refr Vol.21 No.2
In the present paper, the e®ect of desorption temperature on the performance of adsorption cooling systems driven by waste heat from fuel cells was analyzed. The studied adsorption cooling systems employ activated carbon ¯ber (ACF) of type A-20ethanol and RD type silica gelwater as adsorbentrefrigerant pairs. Two di®erent temperature levels of waste heat from polymer electrolyte fuel cell (PEFC) and solid oxide fuel cell (SOFC) are used as the heat source of the adsorption cooling systems. The adsorption cycles consist of one pair of adsorptiondesorption heat exchanger, a condenser and an evaporator. System performance in terms of speci¯c cooling capacity (SCC) and coe±cient of performance (COP) are determined and compared between the studied two systems. Results show that silica gelwater based adsorption cooling system is preferable for e®ective utilization of relatively lower temperature heat source. At relatively high temperature heat source, COP of ACFethanol based adsorption system shows better performance than that of silica gelwater based adsorption system.
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PERFORMANCE INVESTIGATION OF ADSORPTION–COMPRESSION HYBRID REFRIGERATION SYSTEMS
KUTUB UDDIN,TAKAHIKO MIYAZAKI,SHIGERU KOYAMA,BIDYUT BARAN SAHA 대한설비공학회 2013 International Journal of Air-Conditioning and Refr Vol.21 No.4
An analytical investigation on the performance of adsorption–compression hybrid refrigeration systems with two different cycle con¯gurations, cascade type and subcool type has been performed. In the former type, a cascade condenser is used which works as a condenser for mechanical compression cycle and evaporator for adsorption cycle. In the latter type, an evaporative subcooler is used which subcool the °uid of mechanical compression cycle. The refrigerants examined for the mechanical compression cycle are R134a, R152a, R1234yf and R1234ze whereas ethanol is the refrigerant for the adsorption cycle. The main feature of the proposed system is the capability to signi¯cantly reduce work input for the mechanical compressor which results up to 30% energy saving potential depending on the selection of refrigerant and system con¯guration. Based on the thermodynamic properties and laws the study analyzed the effect of the major design parameters such as evaporation temperature, compressor discharge pressure and desorption temperature on the system performances.
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Animesh Pal,Anett Kondor,Sourav Mitra,Kyaw Thu,Sivasankaran Harish,Bidyut Baran Saha 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
This study provides the surface characteristics (surface energy and the acid–base properties) of surface treated activated carbons (ACs) using inverse gas chromatography. The surface energy and the acid–base characteristic of studied adsorbents are determined by the retention time using several non-polar and polar probes at 140 °C. It is observed that the dispersive surface energy dominates for all AC samples. The treatment of Maxsorb III with H2 exhibits the highest basicity due to lower oxygen content on the surface. The presented results express further insights and useful information in functionalizing the activated carbon for various industrial applications.
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