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1 Bavarian Center of Applied Energy Research Solar Air Conditioning - Research and Development Activities at the ZAE Bayern Astrid Hublitz ZAE Bayern, Munich, Germany Division: Technology for Energy Systems and Renewable Energy hublitz@muc.zae-bayern.de

2 Outline Introduction Thermal Driven Air Conditioning Systems Liquid Desiccant Cooling Systems for Dehumidification Demonstration Project ZAE Bayern & L-DCS Technology GmbH: Installation of the Plant and First Operational Experience

3 Methods of Solar Air-Conditioning solar radiation collector PV-cell thermal energy Mechanical Energy electrical energy open cycle desiccant cooling closed absorption chiller liquid desiccant cooling Vapor Compression Cooling Steam Jet Cooling Peltier element vapor compression chiller

4 Configuration Electric Vapor Compression System the electric chiller produces 6 C chilled water dehumidification is made by condensation in air handling unit incoming air 32 C 8 C 22 C C

5 Closed Cycle Absorption Water Chiller (AWC) LiBr/Water system cooling power 10 kw driven by hot water of 75/65 C produces cold water 18/15 C heat Wärmetauscher exchanger solar collector absorption Sorptionskältemaschine chiller Solarkollektor cooling Kühlturm tower heat Wärmespeicher storage fan coils z.b. Kühldecken

6 Closed Cycle Absorption Chiller Performance LiBr-chiller ,1 0, Cooling Kälteleistung power [kw] [kw] 1,0 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 Temperature Heisswassertemp. of heat [ C] supply [ C] Kältezahl (COP) Coefficient of Performance [-] COP inlet temperature outlet temperature

7 SolarCool + PCM Solar heating and cooling system with latent heat storage absorption cooling system based on water/libr solution dry cooling system replaces wet cooling tower latent heat storage supports the reject heat sink

8 SolarCool + PCM: Cooling Mode Day-Time Operation: Charging of PCM- Storage 15 C 18 C CHILLER Absorptionswärmepumpe bzw. Kältemaschine 90 C 85 C Wärme- Speicher AUX. Heizkessel BOILER 40 C 32 C Luftwärmetauscher 32 C DRY AIR COOLER 40 C PCM- Speicher 36 C NT- Kühl-/Heizsystem COOLING SYSTEM LATENT HEAT STORAGE 32 C Solarkollektoranlage SOLAR SYSTEM

9 SolarCool + PCM: Cooling Mode Night-Time Operation: Discharging of PCM- Storage CHILLER Absorptionswärmepumpe bzw. Kältemaschine Wärme- Speicher AUX. Heizkessel BOILER Luftwärmetauscher 18 C DRY AIR COOLER PCM- Speicher 22 C NT- Kühl-/Heizsystem COOLING SYSTEM LATENT HEAT STORAGE 25 C Solarkollektoranlage SOLAR SYSTEM

10 SolarCool + PCM: Heating Mode Surplus Solar Heat: Charging of PCM- Storage CHILLER Absorptionswärmepumpe bzw. Kältemaschine Wärme- Speicher AUX. Heizkessel BOILER Solarkollektoranlage SOLAR SYSTEM Luftwärmetauscher 32 C 35 C NT- Kühl-/Heizsystem COOLING SYSTEM LATENT HEAT STORAGE PCM- Speicher

11 SolarCool + PCM: Heating Mode Low Solar Gain: Discharging of PCM- Storage CHILLER Absorptionswärmepumpe bzw. Kältemaschine Luftwärmetauscher Wärme- Speicher AUX. Heizkessel BOILER Solarkollektoranlage SOLAR SYSTEM 32 C 35 C NT- Kühl-/Heizsystem COOLING SYSTEM LATENT HEAT STORAGE PCM- Speicher

12 Desiccant Cooling System DCS open cycle DCS system, Munters Corporation COP 0.5 exhausted air incoming air

13 Liquid Desiccant Cooling System = L-DCS high density thermochemical storage: storage is free of losses Regenerator built in energy recovery: high COP th flat plate collector low driving temperatures higher collector Collector efficiency Array& lower costs collector array Energy Storage incoming air Absorber Air Cooler exhausted air Indirect Evaporative Cooling Systems

14 Comparison of Storage Capacity for Dehumidification cold water storage: 6-12 C hot water storage for AHP: C, COP = 0.7 ice & water: 0-12 C, f vol = 0.7 salt solution: LiCl-H20, energy density = kwh/m³ 200 specific volume [m³/mwh] specific cost [ /MWh] cold water ice & water 5 hotwater LiCl- H ,000 cold water 20,000 21,000 ice & water 15,000 hotwater LiCl- H

15 Comparison of Primary Energy Balance Compression Chiller L-DCS Technology 100 kw cooling

16 Demonstration Project in Singapore L-DCS Technology GmbH and ZAE Bayern Ambient Conditions Munich & Singapore comfort zone

17 Optimized Configuration L-DCS combined with compression chiller conventional chiller cools the building L-DCS using salt solution for dehumidification indirect evaporative cooler for cooling of the absorption process C g/kg C energy storage up to 250 kwh/m³ C

18 Scheme of Solar Dehumidification System 350 kw drying 550 m² 300 kw 12 m³ storage C g/kg for 12 h 13,000 m³/h 3000 m²

19 L-DCS combined with compression chiller Solar Insolation and Dehumidification Demand Thermal Power [kw] Cooling Demand q1_fresh Insolation Q_CollectorArray Hour of the year [h]

20 Summary of the Demonstration Project in Singapore L-DCS Technology GmbH & ZAE Bayern has installed a first solar dehumidification plant in Singapore in 2006 with 550 m² flat plate collector and 12 m³ storage volume. It has a power of about 200 kw. First tests are done: The absorber showed ca. 90% of the dehumidification expected. A coefficient of performance of 0.7 was evaluated in the first test. A specific energy storage capacity of about 225 kwh/m³ (90% of predicted) was evaluated experimentally.

21 Thank you for your interest!

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