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Numerical assessment of efficiency improvement by implementation of a control technique in transcritical CO2 air conditioning systems.

Number: pap. n. 115

Author(s) : MARTÍNEZ-BALLESTER S., KADAM A, PADALKAR A., et al.

Summary

An optimum pressure that maximizes the COP exists for vapor compression cycles where heat rejection occurs under supercritical pressure, e.g. CO2 transcritical cycles. The paper presents a performance comparison between two transcritical split air conditioning units operating under typical subtropical conditions of Pune city (India). First system of comparison has a control technique to set the gas cooler pressure to its optimum value while second system does not have such a control. The comparison has been carried out by numerical simulations as function of indoor and outdoor conditions. The parameters analyzed are the COP improvement and power input reduction by using a control procedure. The results revealed COP improvements up to 15% and power reductions at most of 22%. The operating conditions to find the largest improvement correspond to large indoor humidity and low outdoor temperature.

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Pages: 8 p.

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Details

  • Original title: Numerical assessment of efficiency improvement by implementation of a control technique in transcritical CO2 air conditioning systems.
  • Record ID : 30004257
  • Languages: English
  • Source: 10th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2012). Proceedings. Delft, The Netherlands, June 25-27, 2012.
  • Publication date: 2012/06/25

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