The performance assessment of a combined organic Rankine-vapor compression refrigeration cycle aided hydrogen liquefaction
| Autor: | Nehir Tokgöz, Onur Bor, Onder Kaska, Ceyhun Yilmaz |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Hydrogen
Renewable Energy Sustainability and the Environment 020209 energy Mass flow Nuclear engineering 05 social sciences Energy Engineering and Power Technology chemistry.chemical_element Liquefaction 02 engineering and technology Condensed Matter Physics Volumetric flow rate Fuel Technology chemistry 0502 economics and business 0202 electrical engineering electronic engineering information engineering Environmental science 050207 economics Vapor-compression refrigeration Geothermal gradient Gas compressor Degree Rankine |
| Zdroj: | International Journal of Hydrogen Energy. 43:20192-20202 |
| ISSN: | 0360-3199 |
| Popis: | In this study, the performance of the combined cooling cycle with the Organic Rankine power cycle, which provides cooling of the hydrogen at the compressor inlet which compresses the constant temperature in the Claude cycle used for hydrogen liquefaction, on the system is examined. The Organic Rankine combined cooling cycle was considered to be using a geothermal source with a flow rate of 120 kg/s at a temperature of 200 °C. The first and second law performance evaluations of the whole system were made depending on the heat energy at different levels taken from the geothermal source. The thermodynamic analysis of the equipment making up the system has been done in detail. The temperature values at which the hydrogen can be effectively cooled were determined in the presented combined system. The efficiency coefficient of the total system was calculated based on varying pre-cooling values. As a result of the study, it was determined that cold entry of hydrogen into the Claude cycle reduced the energy consumption required for liquefaction. Amount of hydrogen cooled to specified temperature increase by increase in mass flow of geothermal water and its temperature. Liquefaction cost is calculated to be 0.995 $/kg H2 and electricity produced by itself is calculated to be 0.025 $/kWh by the new model of liquefaction system. Cost of the liquefaction in the proposed system is about 39.7% lower than direct value of hydrogen liquefaction of 1.650 $/kg given in the literature. |
| Databáze: | OpenAIRE |
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