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Sustainable Heating and Cooling Systems with Renewable Energy

This program focuses on developing a heating/cooling system using renewable energy sources. It involves studying solar collectors, absorption heat pumps, and heating/cooling floors for small or medium buildings. The objective is to design an environmentally friendly system for efficient indoor climate control. Several tests and measurements were conducted to optimize system performance and enhance energy efficiency.

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Sustainable Heating and Cooling Systems with Renewable Energy

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  1. PROGRAMME SOLHEATCOOL STUDY AND DEVELOPMENT OF HEATING / COOLING SYSTEMS USING RENEWABLE ENERGY COSTIC - Comité Scientifique et Technique des Industries Climatiques - Eric MICHEL Enerbuild Participant number : 37

  2. PROJECT PARTNERS COSTIC Research centre - Technical co-ordinator JACQUES GIORDANO INDUSTRIES - France Manufacturer of solar collectors VELTA - Germany Manufacturer of heating / cooling floors ZAE BAYERN - Germany Manufacturer of absorption heat pump IMPAE / NOA - Greece Modelling of the system

  3. RESEARCH TOPIC TO DEVELOP A SOLAR HEATING / COOLING SYSTEM COMPOSED OF : • Absorption heat pump • Solar thermal collectors • Heating / cooling floor

  4. RESEARCH TOPIC

  5. BACKGROUND • Existing reversible systems : • Conventional heat pump • Gas absorption heat pump using LiBr / water with power over 100 kW • Aim of the programme : • To design a HCFC free heating cooling systems using renewable energies for small or medium buildings • Type of buildings : • Surface : about 300 m² • Tertiary sector - little collective housing

  6. PROJECT OBJECTIVES • To study the application of a floor system for cooling • To study high performance solar thermal collectors • To study a Lithium bromide / Water absorption heat pump • To study the complete heating / cooling system

  7. STUDY OF THE HEATING / COOLING FLOOR SYSTEM • Tests achieved in climatic cell • Study of the influence of parameters on the heat exchange coefficient : Objective was to obtain heat exchange coefficient around 7 W/m².K • Testing of a system : inertia - reaction of the control

  8. STUDY OF THE HEATING / COOLING FLOOR SYSTEM MEASURE OF THE HEAT EXCHANGE COEFFICIENT

  9. STUDY OF THE HEATING / COOLING FLOOR SYSTEM HEAT EXCHANGE REPARTITION 1,9 W / m² K 5,5 W / m² K

  10. STUDY OF CONTROL • Measurement of the response to a pseudo step of supply water temperature • Measurement of the response of a floor system to several scenarios • Slow and mean increase of the external dew point • Fast increase of the external dew point • Fast increase of the load • Cycle with internal inputs and solar load simulation • Results • Control must insure a fast reaction of water temperature to variation of the dew point in order to limit risks of condensation on the floor

  11. STUDY OF THE SOLAR COLLECTORS • Improvements brought to the collectors • New selective coating to improve the efficiency • New welding process : laser welding to allow an on line production CORTEC prototype C8 prototypes

  12. STUDY OF THE SOLAR COLLECTORS C8 COLLECTORS

  13. CORTEC with laser welding CORTEC Objective = 0,89 - 2,5 DT/H STUDY OF THE SOLAR COLLECTORS CORTEC

  14. Measurement of the efficiency of the heat pump according to several parameters: Temperature of the water from the collectors; Temperature of the water from the cooling floor; Temperature of the water from the cooling tower. Testing of the prototype in real conditions coupled with cooling floor and solar collectors. Description of the tests (1) STUDY OF THE ABSORPTION HEAT PUMP

  15. Description of the tests (2) STUDY OF THE ABSORPTION HEAT PUMP Return from cooling tower temperature temperature Return from solar collectors Chilled water temperature

  16. Test facilities (1) STUDY OF THE ABSORPTION HEAT PUMP

  17. STUDY OF THE ABSORPTION HEAT PUMP Test facilities (2)

  18. STUDY OF THE ABSORPTION HEAT PUMP First results of tests in laboratory Tcondenser inlet = 29,3 °C Tcondenser outlet = 35,4 °C Cooling tower T = 6,1 K Tevaporator inlet = 20,7 °C Tevaporator outlet = 17 °C 17,9 kW T = 3,7 K Absorption heat pump 10,1 kW 7,1 kW Boiler Cooling floor Tboiler inlet = 94,4 °C Tboiler outlet = 87,3 °C COP = 0,7 T = 7,1 K

  19. CONCLUSION (1) • Study of the heating / cooling floor system • Measurement of the heat exchange coefficient • Sizing of the whole system • Study of the working of the control • Objectives reached • Study of the solar collectors • Measurement of the performances of some prototypes • Objectives reached • Study of the AHP (on going) • Measurement of the performance according to several parameters (boiler temperature, evaporator temperature, cooling tower temperature) : first results showed a good working of the AHP. The COP reaches 0.7.

  20. CONCLUSION (2) • Study of the whole system • Connection of the different part of the system and measurement of the performances • Modelling • Modelling of the working and preparation of a handbook and a data basis of the results of the modelling • End of the programme : September 2001

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