Task B - Performance evaluation

Thermally driven heat pumps offer the possibility of primary energy savings compared to electrical compression systems. For the evaluation of the primary energy saving potential a well – founded comparison of both types of systems has to be done. Therefore a methodology of “how to determine COP” (use and spread EN standard) and a test procedure has to be developed. Furthermore the extension of the COP to an annual basis has to be done, in order to make a uniform and transparent comparison in primary energy consumption possible. If necessary additional performance figures will be developed and proposed for use in the extension of standards.

WP 1 - existing standards

The WP1 will collect and evaluate existing standards for the determination of energy efficiency (CEN, ECO-design, ASHRAE, ARI). A special focus will be led on standards for efficiency characterization of electrical compression systems.
Depending on the standards possibly a split into industry and buildings applications will be necessary.
 

WP 2 - Performance definition

The efficiency evaluation should be applicable for systems and for a single apparatus. The performance definition therefore has to be formulated separately for both cases. 
Defining a standard performance for an apparatus the mass flows and temperatures have to be defined as well as other energy fluxes connected to apparatus operation (e.g. parasitic electricity consumption for control of the apparatus). For the evaluating of a whole system the boundary conditions have to be carefully discussed and defined in a way that makes them comparable to electrical driven systems.
For primary energy analysis, the value of different energy sources has to be considered. The electrical grid efficiency and other country specific values have to be taken into consideration and have to be mentioned in the country reports of Task A.
The efficiency evaluation will be done with focus on primary energy consumption. The estimation of electrical energy consumption, current peak, CO2 – Emission, exergy consumption or even exergo – economic efficiency could provide an additional perspective on the system.  The decision for one or more of these additional methods will be discussed in the work package. 
 

WP 3 - Test procedures

On the basis of the results of WP1 and WP2 test procedures will be defined.
The determination of COP will be carried out according to EN14511 or EN12309-2. For the basis of performance determination the standard conditions and Certification procedures of DACH should be analyzed and probably used.
Eventually, a split in apparatus or system technology will be necessary.
 

WP 4 - Comparisions

Within the WP4 the performance of electrically and thermally driven systems already in the market will be compared by measured data. The data will be used for the calculation of efficiency values defined in WP2.  
Real monitoring will be possible only for a few systems. Therefore a transformation of measured results into different climatic regions and regulatory frameworks by system simulation will give a map of technical and economical potential for different technologies. This work should be done in strong cooperation with task D/ WP3.
 

WP 5 - Labeling

WP5 will develop a methodology for labeling of thermally driven heat pumps. This work should be strongly orientated on the Certification procedures, proposed in the draft for a “Community Eco – Label for electrically driven, gas driven or gas absorption heat pumps”, the Eurovent certification programme and the DACH certification programme.
The defined label should not only focus on energy efficiency, but also on long term reliability.
 

Task B - deliverables

• A description of a standard to determine COP values and other energy performance figures s of thermally driven heat pumps and of systems using thermally driven heat pumps (technical report)

• A description of a standard proposal  to Label thermally driven heat pumps.(technical report)

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