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Solar Thermal Systems. Trends and Technology. Contents. 1) Introduction 2) Evacuated Tube Technology 3) Evacuated Tube Projects 4) Design Consideration 5) Control Systems. 1) Introduction. Solar Thermal has been around a long time

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solar thermal systems

Solar Thermal Systems

Trends and Technology

contents
Contents
  • 1) Introduction
  • 2) Evacuated Tube Technology
  • 3) Evacuated Tube Projects
  • 4) Design Consideration
  • 5) Control Systems
1 introduction
1) Introduction
  • Solar Thermal has been around a long time
  • Solar Thermal technology is quite mature – far more efficient than PV – over 90%
  • Flat Plate and Evacuated Tube both Developed Technology
  • Payback 10-15 years with no rebates and at current energy prices.
applications
Applications
  • Domestic Hot Water
    • Hotels, Apartments, Condos, Restaurants
  • Industrial Hot Water
    • Parts washing, Process heat
  • Agricultural Hot Water
    • Dairy, Bottling
  • A/C Reheat – Dehumidification
  • Space Heating
  • Chillers
  • Swimming Pools
2 evacuated tube technology1
2) Evacuated Tube Technology
  • Two most important parts: vacuum insulation and heat pipe technology
    • Vacuum – the best insulator
    • Heat pipe – takes advantage of the latent heat of steam
  • Styles
    • Flow through
    • Sealed pipe
    • Temperature limiting
2 evacuated tube technology4
2) Evacuated Tube Technology

Evacuated Tube vs Flat Plate

2 evacuated tube technology5
2) Evacuated Tube Technology
  • Efficiency Curve Comparison:
2 evacuated tube technology6
2) Evacuated Tube Technology
  • Output of Selected Solar Panels (SRCC Data):
4 design considerations
4) Design Considerations
  • Facility BTU usage
    • Existing Facilities vs New
    • Flow meters, BTU meters
    • Watt meter or Gas meter
    • Recirculation
  • Collectors
    • 35,000-40,000 BTU/day
  • Storage
    • Use Profile
    • 40 -80- gallons per collector
4 design considerations1
4) Design Considerations
  • Freezing
    • Freezing is biggest problem with solar thermal - up till now solution has been:
      • Glycol – heat capacity, double wall, glycolic acid
      • Drainback – practical limitations
      • Evacuated Tube
    • Direct water
    • Simple
    • Fewer components
    • Lower maintenance
5 control systems
5) Control Systems
  • Size of System
    • Few intermediate Delta T controllers
      • RESOL DeltaSol M – 12 inputs, 6 outputs, pre-programmed
      • Temperature compensating valves
  • Data Acquisition
    • Additional data for efficiency and service

Temperature alarms

Low Flow/Pressure alarms

    • Real time $$ Savings Reports
  • PLC considerations
    • Flexibility, scalability
    • Remote logging
    • Building management interface