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Background: |
On the background of environmental challenges, a manifold of
energy systems delivering building services like space heating,
domestic hot water production, ventilation and cooling have been
developed and are competing on the market. A characterisation of
the performance and the capability of the system to fulfil
requirements is a necessity.
The EU energy performance directive of buildings
(EPBD), being introduced in
2006, requires means to indicate the performance of the system
to make a fair comparison of different competing energy systems
and to bring transparency and confidence to the consumer. In
North America and Japan, Energy labelling systems, which use the
same metrics, have similar objectives.
The objective of the IEA HPP Annex 28 is to focus hereby on the
development of test and calculation methods for combined
operating heat pumps systems as input to standardisation
committees. |
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Scope: |
Heat pumps have become an attractive heating system due to
significant reduction of the energy consumption of buildings.
With decreasing energy consumption of the
building and temperature level of the heating system, the
share of energy consumption for the domestic hot water
production is continuously increasing. Decisive for the
performance is the overall seasonal performance
factor of the system.
Present standards cover only the single operation modes and do
not honour process improvements by combined operation.
IEA HPP Annex 28 is to investigate the testing of the most
common combined heat pump systems with space and domestic hot
water heating.
The systems to be investigated include the heat pump, the hot
water storage (or a one through water heater) and an optional
supplemental back-up heating as shown in the following figure:
The share of the domestic hot water consumption usually
represents 10% to 50% of the total annual heating consumption.
The Annex applies to heat pumps with hydronic or air heat
distribution systems and alternative or simultaneous domestic
hot water production.
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Objectives and results: |
The objectives of IEA HPP Annex 28 according to the
legal text are
twofold:
- to establish a test procedure which delivers the data
necessary to calculate the overall seasonal performance
factor of systems
- to work out a simple method to calculate the seasonal
performance factor for the heat pump systems
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Project structure and time schedule: |
The project is worked out task-shared between the participants.
The projected Annex running time is 28 month (1.1.2003 to
30.4.2005).
The Annex is structured in three tasks, referring to the
objectives.
- Task 1: Systems to be investigated
- Task 2: Development of test procedure
- Task 3: Development of a calculation method
The tasks are worked out in national projects.
Overview of the national projects
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