Innovative Solar thermal systems for heating and cooling

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1 Innovative Solar thermal systems for heating and cooling Warsaw 18 th June 2009 Panagiotis Tsekouras PhD Candidate Mechanical Engineer CRES - Solar Thermal Dept.

2 Overview The HIGH COMBI project SC+ Symbolism SC+ & SST SC+ & SST & GHE SC+ & SST & GHE & GHP SC+: SST: GHE: GHP: Solar Combi plus systems Seasonal Storage Tank Ground Heat Exchangers Geothermal Heat Pump The Greek plant

3 Overview The HIGH COMBI project SC+ SC+ & SST SC+ & SST & GHE SC+ & SST & GHE & GHP The Greek plant

4 The Project HIGH COMBI High solar fraction heating and cooling system with combination of innovative components and methods Start Time June 2007 Duration Coordination Scope 48 months Dr. Constantine Carytsas, CRES (Centre for Renewable Energy Sources and Saving) Develop high solar fraction systems by combination of different technologies of solar heating, cooling and storage. Realize several demonstration plants.

5 Consortium & Plants 6 Participating Countries 5 Demonstration Plants Austria Italy Germany Greece Austria (2) Italy Greece Spain Romania Spain

6 Consortium (Coordinator)

7 Overview The HIGH COMBI project SC+ SC+ & SST SC+ & SST & GHE SC+ & SST & GHE & GHP The Greek plant

8 SC+

9 SC+, Case Study Solar Combi + system for residential house in Wiesloch, Germany Source: Brinkmöller Characteristics Source: SolarNext 40 m 2 Flat Plate Collectors 2,000 l Hot Water Storage 7.5 kw Cooling Capacity (SorTech Adsorption Chiller) 22kW Cooling Tower

10 Overview The HIGH COMBI project SC+ SC+ & SST SC+ & SST & GHE SC+ & SST & GHE & GHP The Greek plant

11 Why use energy storage? Disadvantage: Unexploited solar energy Solution: Seasonal Storage Tank Building energy demands and solar production

12 SC+ & SST

13 Overview The HIGH COMBI project SC+ SC+ & SST SC+ & SST & GHE SC+ & SST & GHE & GHP The Greek plant

14 Principle of Cooling Operation Conventional Chiller Sorption Chiller QM = Qc + W QM = Qc + QH 1.3 kw 2.4 kw W Compression QH Sorption 0.3 kwe 1.4 kwt 1 kwc 1 kwc Qc Qc

15 SC+ & SST & GHE

16 Overview The HIGH COMBI project SC+ SC+ & SST SC+ & SST & GHE SC+ & SST & GHE & GHP The Greek plant

17 Innovative Geothermal Heat Pump

18 SC+ & SST & GHE & GHP

19 Overview The HIGH COMBI project SC+ SC+ & SST SC+ & SST & GHE SC+ & SST & GHE & GHP The Greek plant

20 The Greek Plant Characteristics Solar system for heating and cooling (absorption chiller) End user is CRES s offices in Athens Use of Seasonal Storage Tank (SST) Innovative heat rejection system thermally coupled with the SST High Solar Fraction over 80% Possible integration of a geothermal heat pump

21 Building CRES Offices (Building No 3), Athens

22 Building Data Building Data Area m 2 Heating Load (max) 31.7 KW Heating Energy Demand 12.3 MWh Cooling Load (max) 33.2 KW Cooling Energy Demand 19.4 MWh DHW Demand - Heating / Cooling Distribution System Fan Coils Building Energy Demands 6.0 Heating Demand Cooling Demand Energy (MWh) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Building Energy Demands, Month Heating / Cooling

23 Solar System I Energy System Data Type Unit Collectors Flat Plate 90 m 2 Primary Circuit Fluid Mixture of propylene glycol and water 30 % Chiller Absorption 35 kw Heat Rejection GHE & Cooling Tower Storage Buried Cylindrical Tank 60 m 3 Heating supply/ return Temperature Fan Coils 45 / 38 o C Cooling supply/ return Temperature Fan Coils 7 / 12 o C Estimated Solar Fraction over 80%

24 Solar System II Solar Production 25 40% Energy (MWh) % 20% 10% Efficiency 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0% Total radiation Solar field production Collectors' Efficiency 100 Temperature of the Seasonal Storage Tank 80 Temperature (oc) Jan Feb Mar Apr May Jun Jul Αυγ Sep Oct Nov Dec Ttank_top Ttank_bottom

25 Storage System Innovative Seasonal Storage Type Storage Cylinder 60 m 3 Position Underground (Tground ~ 15 o C) 1 m Restrictions High Water Level 8 m Structure Steel & Concrete Insulation Polyurethane & Chipped Tyres 0,4 W/(m 2 K) Unit Tank Thermal Losses Energy (MWh) Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 0.2 Tank Thermal Losses Tank Thermal Losses-Edge Tank Thermal Losses-Top Tank Thermal Losses- Bottom

26 Thank you for your attention! Centre for Renewable Energy Sources and Saving Solar Thermal Department 19klm. Marathonos av., 19009, Pikermi tel , fax