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Sökning: L773:9782362150036

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1.
  • Lane, Anna-Lena, et al. (författare)
  • System Efficiency Index, SEI A key performance indicator for field measurements of refrigeration, air conditioning and heat pump systems
  • 2014
  • Ingår i: 3rd IIR International Conference on Sustainability and the Cold Chain. - 9782362150036 ; , s. 695-702
  • Konferensbidrag (refereegranskat)abstract
    • At present there is a lack of a concept which can be used to evaluate and compare efficiency for installed refrigeration systems using short term measurements. Traditionally COP (Coefficient of Performance) has been used but it has a weakness as a comparator as it is strongly dependent on operating conditions. System Efficiency Index (SEI) is the ratio between the measured COP and the COP for an ideal process, known as the Carnot efficiency operating between the same temperature levels. In collaboration between SP Technical Research Institute of Sweden, IOR and VDMA the method has been further developed. This paper will focus on the method and results from the implementation of SEI from field measurements for, in the first step, condensing units and chillers. The principle is the same for all kind of refrigeration systems. In the next step more measurements for refrigeration systems will be evaluated.
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2.
  • Ohannessian, Roupen, et al. (författare)
  • Thermal energy storage potential in supermarkets
  • 2014
  • Ingår i: Refrigeration Science and Technology. - 9782362150036 ; , s. 452-459
  • Konferensbidrag (refereegranskat)abstract
    • The objective of this research is to evaluate the potential of thermal energy storage in supermarkets with CO2 refrigeration systems. Suitable energy storage techniques are investigated and the seasonal storage technology of boreholes is chosen to be the focus of the study. The calculations are done for four supermarket refrigeration systems with different combinations of heating systems. The two heating systems analyzed are the ground source heat pump and the heat recovery from the supermarket's refrigeration system. The simulation results show that the introduction of thermal energy storage in the scenarios with ground source heat pump can reduce the annual total energy by about 6%. Moreover, it is established that a supermarket system with heat recovery consumes 8% less energy than the one using ground source heat pump.
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  • Resultat 1-2 av 2
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konferensbidrag (2)
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refereegranskat (2)
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Sawalha, Samer (1)
Berglöf, Klas (1)
Benson, Jessica (1)
Lane, Anna-Lena (1)
Hundy, Guy (1)
Ohannessian, Roupen (1)
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Kungliga Tekniska Högskolan (1)
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Engelska (2)
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2014 (2)

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