IEA HPP ANNEX 28—A UNIFORM ENERGY-RELATED CHARACTERISATION OF HEAT PUMP SYSTEMS
Which heating system is performing best? This question is still not easy to answer, since standardised calculation methods for the comparison of different heating systems hardly exist. Annex 28 of the Heat Pump Programme (HPP) of the International Energy Agency (IEA) has been initiated to deliver calculation methods for the Seasonal Performance Factor (SPF) and the necessary comprehensive test procedures of combined operating heat pump systems. The results of this research are continuously transferred to the standardisation committees. Nine countries are participating in the IEA HPP Annex 28. New system developments are often not covered by existing standard testing or calculation methods. Thus, the application of the test procedures and the calculation methods developed in the framework of IEA HPP Annex 28 is manifold: Manufacturers have regulations for providing precise and uniform technical data. On the other hand, system layouts can be compared in the planning process. Moreover, energy labels or building standards can be based upon the SPF. Hence, a uniform testing and calculation is necessary to overcome trade barriers and enhance consumer confidence.