Solar Thermal Systems for Buildings

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1 Solar Thermal Systems for Buildings Murat Aydemir Viessmann Middle East FZE General Manager (M.Sc. Mech.Eng., ASHRAE, EGBC) Al Jaheli Theater AFOC, Abu Dhabi Abu Dhabi Green Building Conference

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3 Viessmann Group Founded 1917, 1.4 Billion turnover, 8500 employees

4 Viessmann is one of the leading boiler and renewable energy manufacturers of Europe Boilers from 1, kw with efficiencies up to 109 % for gas, oil and bio-fuels

5 Viessmann has system solutions for heating, hot water and solar energy applications in housing and commercial projects

6 The power source of the earth In less than four hours the sun radiates the annual energy demand of the world s population to the earth. Annual Solar Radiation on Earth Estimated Fossil Fuel Sources Annual Energy Consumption on Earth

7 Solar energy Annual Energy amount (Europe) : Ø 1000 kwh/m²*a Annual Energy amount (UAE) : Ø 2000 kwh/m²*a

8 related to buildings Heat Electricity (direct with PV) Concentrated Solar Power Solar lighting Bio Fuels

9 Solar energy Heat What can we do with heat? - Domestic hot water - Pool heating - Heating support in cold climates - Process heat - Solar cooling with absorption chillers

10 Solar-thermal: Heat through sunshine Vitosol 100 Vitosol 200 Vitosol 300

11 Vitosol 100 Flat collectors

12 Vitosol 200 Evacuated tube collector with copper absorber, direct flow

13 Efficiency curve 0,9 Solar Kollektor-Wirkungsgrade Collector Efficiencies Vitosol Vitosol - Programm Range Wirkungsgrad Efficiency 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0,1 Vitosol 100 (1,7) Vitosol 100 (5DI) Vitosol 200 Vitosol 300 Vitosol 100 (2,5) Delta T [K] Temp.-Differenz [K]

14 Life expectations of solar collectors 20 years +

15 Life expactations of solar collectors 30 years 35 years

16 Solar thermal hot water generation

17 Large scale solar thermal, Example for a liter/day hot water system

18 Large scale solar thermal, Example for a liter/day hot water system

19 Large scale solar thermal, Example for a liter/day hot water system

20 Solar hot water generation closed loop- open loop differences Closed loop Thermosiphon Thermosiphon is the easiest solution: No power supply, no pump, no control, works everywhere Advantages of closed loop system: No tank on collector, architecturally better installation Hot water resirculation possible, less water losses, no problems with low water quality Better control, higher efficiency, no over night cooling losses Best for large scale solar systems

21 Example: Selection of a Solar cooling system in UAE Hot water (Solar panel): flow rate: 32.5 l/sec Temperature: 115 / 103 C Capacity: 1590 kw Cooling water: flow rate: l/sec Temperature: 38 / 43.6 C Capacity: 2578 kw Chilled water: Flow rate: 48.0 l/sec Temperature: 12 / 7 deg C Capacity: 1000 kw

22 Example: Selection of a Solar cooling system in UAE Delta T and design temperatures for the solar circuit with a single stage absorbtion chiller Δ T 5K

23 Installation examples Case study Green Building, Manchester

24 Installation examples

25 Installation examples Vacuum tube collectors on a vertical surface

26 Installation examples

27 Installation examples in UAE Jebel Ali Process heating system Solar Absorber gross surface area : m 2 Energy produced by collectors : 376,4 MWh/year Diesel savings : 48,1 m 3 /year. CO 2 emissions avoided : kg Application0 : Process heat for hot water loop at manufacturing plant Installed by Value Addition FZE

28 Installation examples in UAE Jebel Ali Process heating system

29 Installation examples in UAE Palm Jumeirah Residential buildings solar hot water system Solar Absorber gross surface area : 14 x 200 m 2 (2800 m 2 ) Energy produced by collectors : 3805 MWh/year Natural gas savings : m 3 /year. CO 2 emissions avoided : kg Backup system Gas fired wall hung condensing boilers Installed by Value Addition FZE

30 Installation examples in UAE Palm Jumeirah System Viessmann Flat Solar Thermal Panels with original support system and connection pipes

31 Installation examples in UAE Palm Jumeirah System Viessmann Domestic Hot Water cylinders Viessmann Gas condensing boilers for the backup of the system (109 % efficiency)

32 Installation examples in UAE System for villa s in Jumeirah Solar hot water system with electric backup Viessmann Domestic Hot Water cylinders

33 Installation examples in UAE Al Quoz System labour camp Operational since 2000

34 Photovoltaic or Solar Thermal? Based on simulations for UAE: 1 m 2 Solar Thermal Investment ~ Euro Gain 1300 kwh/a heat CO 2 savings 932 kg/a 1 m 2 PV system Investment ~ 1500 Euro Gain 208 kwh/a electric CO 2 savings 184 kg/a

35 Solar energy needs good engineering design and installation to reach the goal!

36 Questions?