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Performance audits of heat pumps: procedures and uncertainties.

Author(s) : FAHLÉN P.

Summary

Heat pumps are used for climate control of buildings and processes. Experience indicates that their real-world efficiency often is considerably below the theoretical potential. This has been noted by the European Union and hence the Directive on Energy Performance of Buildings includes the status of air-conditioning and heating systems. Performance audits can detect deviations and indicate ways of upgrading the performance. A survey indicates a shortage of proven, cost-effective methods but a Nordic work has resulted in two in situ test methods. One is based on traditional external measurements of energy inputs and outputs. The other relies on internal measurements of temperatures and pressures inside the refrigerant system. Both methods include requirements on accuracy and stability and methods to compare stated performance with measured data. The internal measuring principle has been validated by means of laboratory measurements and sensitivity analysis. Deviations between the internal and external methods were typically less than 5%. One particular advantage of the internal principle is the possibility to disclose a deviation from expected performance and simultaneously provide information regarding the cause.

Details

  • Original title: Performance audits of heat pumps: procedures and uncertainties.
  • Record ID : 2006-3163
  • Languages: English
  • Source: 8th IEA Heat Pump Conference 2005: global advances in heat pump technology, applications, and markets. Conference proceedings [CD-ROM].
  • Publication date: 2005/05/02

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