IEA Heatpump Programm Annex 28





National project

CETIAT has accomplished measurements of a combined brine-to-water heat pump using desuper¬hea¬ting of the compressed refrigerant. Fig. 1 depicts the layout of the system. The system has the following operation modes: space heating only and combined space heating and DHW production by desuperheating. In addition, an electrical back-up heater is used, if there is no space heating, during night times and if the maximum temperature of the storage tank is less than 60°C.
The testing of the system has been performed according to existing standards and standards being currently discussed or introduced: The single heating mode according to EN 14511, CEN/TS 14825 for part load operation, EN 255-3 and M/324 with the European reference tapping cycles No.2. In conclusion, a test procedure for these types of heat pump systems is proposed.

Fig. 1: Simultaneous brine-to-water heat pump of French project

EdF has performed tests for part load operation of an air-to-water heat pump in heating and in cooling mode at different load ratios [5% to 100%], different capacities of the distribution/emission system [11, 22, 33 l/kW] and different settings of the hysteresis controller. Delivered results shall serve as hints for the calculation method by providing correction factors for part load operation.. Fig. 2 shows the layout of the test rig for the part load testing.

Fig. 2: Layout of the test-rig for the testing of part-load operation of an air-to-water heat pump

French national team IEA HPP Annex28
National Team Leader:  
cetiat CETIAT
Domaine Scientifique de la Doua
Dominique Hantz
25, avenue des Arts
BP 2042
F-69603 Villeurbanne

Fax: +33-(0)-72444999
National Team:  
edf EdF research and development
Thermal comfort technology
Christine Arzano-Daurelle
Site des Renardières - Route de sens – Ecuellers
F - 77818 Moret-sur-Loing Cedex – France
Phone +33-1-60737181
Fax:: +33-(0)1-60736539
French heat pump links
costic Comité Scientifique et Technique des Industries Climatiques Costic
Costic assures the symbiose between the research world and the necessities of enterprises of technical equipment. As an independent association, its mission consists of giving advice and assistance for studies and research, education and dissemination of knowledge. Website:

last update:22.01.2008

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