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The utilization of internal heat exchanger (IHX) is one option for system performance improvement of a transcritical carbon dioxide (CO2) cycle for comfort cooling. In this study, the cooling performance of a CO2 cycle with an IHX has been experimentally investigated. All the performance tests have been carried out at fixed cooling capacity and refrigerant superheat at evaporator outlet. The effects of the heat rejection pressure, evaporating temperature and IHX length on the cooling performance are discussed. Experimental results show that the cooling performance of a CO2 cycle depends greatly on the heat rejection pressure and there exists an optimal value at which COP reaches its maximum. The evaporating temperature has significant influence on COP but insignificant influence on the optimal heat rejection pressure. IHX is proven to be a very important factor to achieve high performance for a CO2 cycle for comfort cooling, due to a considerable COP increase and a certain decrease in optimal pressure.
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Details
- Original title: An experimental study on the cooling performance of a CO2 cycle with an internal heat exchanger.
- Record ID : 2010-1372
- Languages: English
- Source: 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
- Publication date: 2008/09/07
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