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ABSOCOMP / EnerBuild No.: 32

ABSOCOMP / EnerBuild No.: 32. 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

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ABSOCOMP / EnerBuild No.: 32

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  1. ABSOCOMP / EnerBuild No.: 32 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

  2. 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-H2O • 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. 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. ABSORBER / FREEZER UNIT

  5. 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. PROJECT RESULTS Results of thermodynamic calculations about 25% energy saving can be achieved for a mean cooling water temperature of 30°C (absorption fluid: LiBr - H2O – mixture)

  7. DELIVERABLES AND ACHIEVEMENTS • Improved material properties especially • for the operation area by measurements • Investigations surfactants and a new • working mixture (Water/LiBr + LiI + LiNO3 • + LiCl) • Design data of compact heat and mass • exchanger • Experimental plant • Process design • Performance data • Applications • Results of modelling and computer • simulation

  8. 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

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