30 May 2005

A GENERIC CALCULATION SCHEME TO ESTIMATE SEASONAL PERFORMANCE OF COMBINED SYSTEMS AND EXPERIMENTAL RESULTS


The energy requirement for space heating is decreasing significantly in modern highly-insulated
dwellings. Hence, the share of domestic hot water reaches a substantial part of the total energy
requirement. In addition, auxiliaries have a considerable impact on the performance, as well.
A new European directive on the energy performance of buildings requires sound methods to
calculate the over-all seasonal performance factor of building equipment. Within the framework of
IEA HPP Annex 28 a generic calculation scheme for combined heat pump systems, i.e. systems for
space heating and domestic hot water generation, has been developed by the University of Applied
Sciences Basel (FHBB). This calculation method, called the FHBB method, has already been
implemented in the CEN draft standard prEN 14335 and submitted to public enquiry. Furthermore the
calculation method is extended to cover multi-function heat pump systems providing heating
(cooling), ventilation and domestic hot water. At the same time, extensive measurements in two pilot
plants are being carried out and evaluated to