A study on heat storage sizing and flow control for a domestic scale solar-powered organic Rankine cycle-vapour compression refrigeration system
Autor: | Jing Li, Yuehong Su, Cagri Kutlu, Yubo Wang, Mehmet Tahir Erdinç |
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Rok vydání: | 2019 |
Předmět: |
Organic Rankine cycle
060102 archaeology Isentropic process Renewable Energy Sustainability and the Environment Water flow 020209 energy Nuclear engineering Boiler (power generation) Refrigeration 06 humanities and the arts 02 engineering and technology Thermal energy storage Heat exchanger 0202 electrical engineering electronic engineering information engineering Environmental science 0601 history and archaeology Gas compressor |
Zdroj: | Renewable Energy. 143:301-312 |
ISSN: | 0960-1481 |
Popis: | This paper presents the off-design modelling of a domestic scale solar organic Rankine cycle (ORC) and vapour compression cycle (VCC) in a coupled operation in different operating modes by using evacuated flat plate (EFP) collectors. Thermodynamic and parametric studies of such coupled system in literature usually assume that the isentropic efficiencies of expander and compressor and the heat exchanger pinch temperature differences are constant. Moreover, studies for directly coupling the ORC-VCC system with solar collectors are somewhat rare. Transient performance of the solar ORC-VCC considering the off-design behaviour of the system components needs to be investigated. A simulation for a period of 24 hrs is conducted by considering the electricity and cooling demand of a 60 m2 office building during a typical day in July for Istanbul. The effect of heat storage capacity on meeting the demand is investigated for a given area of EFP collectors. Moreover, the water flow rate to the boiler is controlled periodically to provide the demanded electricity and cooling. The required EFP collector area and heat storage unit volume have been determined to be 80 m2 and 9.4 m3, respectively. For these design parameters, 25.6 kWh cooling and 18.76 kWh electricity can be generated during a typical day in July. Finally, a simulation is given for such design on a sunny winter day in February, 5.5 kWh electricity and 104 kWh heat can be produced. |
Databáze: | OpenAIRE |
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