1. Energy Environment & Sustainable Development Thematic Network on Energy in the Built Environment DEVELOPMENT OF A HEAT PUMP WITH HIGH EFFICIENCY FOR HEATING AND AIR-CONDITIONING ON THE BASIS OF A COMBINED ABSORPTION/COMPRESSION PROCESS (ABSOCOMP) Co-ordinator: Prof. Dr.-Ing. Ch. Mostofizadeh Presenter: Dipl.-Ing. D. Bohne Institut für Energie- und Verfahrenstechnik (IEV) ttz-Bremerhaven An der Karlstadt 6 27568 Bremerhaven Germany Tel: +49 (0) 471 / 9448-800 Fax: +49 (0) 471 / 9448-822 email: iev@ttz-bremerhaven.de ABSOCOMP / EnerBuild No.: 32

2. Energy Environment & Sustainable Development Thematic Network on Energy in the Built Environment PROJECT OBJECTIVES Objectives and characteristics of the ABSOCOMP - Process Combination of the absorption and compression cycle Heat pump for combined heating (during wintertime) and cooling operation (during summertime) For cooling purposes an ice-suspension up to 50 % ice content will be produced under triple point conditions Use of inorganic, non-toxic and non-volatile substances as refrigerant (ice/water); absorption fluid: LiBr-H 2 O Lower energy demand in comparison to conventional water chillers (higher COP) Large storage capacity of the refrigerant (using cheap night-time electricity rates) No use of conventional refrigeration plants as auxiliaries

3. Energy Environment & Sustainable Development Thematic Network on Energy in the Built Environment RESEARCH / TECHNOLOGY TOPICS Scientific topics Absorption at low pressures (6 mbar) Ice forming at triple point conditions Investigation of heat and mass transfer on enhanced surfaces Technical topics Improvement of air-conditioning systems System integration possibilities for the Mediterranean area Control mechanisms and part load behaviour Suitable components for ice transport

4. Energy Environment & Sustainable Development Thematic Network on Energy in the Built Environment ABSORBER / FREEZER UNIT

5. Energy Environment & Sustainable Development Thematic Network on Energy in the Built Environment METHODOLOGY Research approach and methodology Investigation of air-conditioning systems for the integration of heat pumps Compilation of properties for selected working mixtures Analysis of compact heat exchangers Thermodynamic design and kinetic calculation Planning and construction of the experimental plant Building, assembly and start up of the plant Implementation of trials Modelling and computer simulation Examination of possible applications

6. Energy Environment & Sustainable Development Thematic Network on Energy in the Built Environment PROJECT RESULTS  about 25% energy saving can be achieved for a mean cooling water temperature of 30°C (absorption fluid: LiBr - H 2 O – mixture) Results of thermodynamic calculations

7. Energy Environment & Sustainable Development Thematic Network on Energy in the Built Environment DELIVERABLES AND ACHIEVEMENTS Improved material properties especially for the operation area by measurements Investigations surfactants and a new working mixture (Water/LiBr + LiI + LiNO 3 + LiCl) Design data of compact heat and mass exchanger Experimental plant Process design Performance data Applications Results of modelling and computer simulation

8. Energy Environment & Sustainable Development Thematic Network on Energy in the Built Environment CONCLUSIONS / OUTLOOK Principle of the process works in cooling and heating operation Application have been investigated in industrial and domestic branches Some technical modifications and optimisations of the plant are on work A market study and cost calculation will be started The partners will commercialise the process for mass production