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Geothermal Retrofit of HVAC Systems by rtu18834

VIEWS: 81 PAGES: 16

									Geothermal Retrofit
 of HVAC Systems



                                            Absorption Chiller
      Water-water                        (Yazaki Energy Systems)
                           Water-air
 plate heat exchanger   heat exchanger




      Andrew Chiasson
      Geo-Heat Center
 Oregon Institute of Technology
         Retrofit Possibilities
 Space heating
 Domestic hot water
   Suitability depends mainly on flow
    requirements and need for storage
 Space cooling
   Newer absorption chillers rated at 192oF
             HVAC Systems
                    Types

 Several types of configurations for space
  heating
 HVAC systems are categorized by the
  method used to convey energy
   All-air systems
   Air-and-water systems
   All-water systems
                HVAC Systems
                  All-Air Systems

 All heating, cooling, and humidification is
  supplied to a space by the air
   Single-duct systems
      Constant volume
      Multi-zone, variable-air volume (VAV)
      Multi-zone with re-heat
   Dual-duct systems
                    HVAC Systems
                       All-Air Systems

 Single duct systems
  Fossil-fuel furnace with direct-expansion (DX) cooling
                  HVAC Systems
                     All-Air Systems

 Single duct systems
    Commercial system with central heating and cooling coils
                  HVAC Systems
                     All-Air Systems

 Single duct systems
    Commercial roof-top units
                  HVAC Systems
                     All-Air Systems

 Single duct systems
    Commercial system with central heating and cooling coils
                  HVAC Systems
                     All-Air Systems

 Single duct systems
    Multi-zone commercial system with variable-air volume (VAV) fan
                  HVAC Systems
                    All-Air Systems
 Geothermal Retrofit Suitability (Rafferty, 1998)
    Low Temperature water (<150oF)
       Single-zone, multi-zone, dual duct      8-10
       Terminal reheat, VAV                    6-8
    Standard Temperature water (180-200oF)
       Single-zone, multi-zone, dual duct      7-8
       Terminal reheat, VAV                    6-7
    Steam
       Single-zone, multi-zone, dual duct      6
       Terminal reheat, VAV                    4-5
    Electric resistance furnace                5-6
    Air-air split heat pump                    3-4
    Fossil-fuel furnace                        4-5
    Packaged roof-top unit                     3-4
    Fossil-fuel fired unit heaters             3-4
                 HVAC Systems
                 All-Water Systems

 Hot and chilled water are distributed to
 terminal units and equipment
     Free-standing radiators
     Baseboard radiators
     Wall, floor, ceiling panels
     Fan coil units
                HVAC Systems
                All-Water Systems

Fan coil unit                 Unit ventilator (4-pipe)
                    HVAC Systems
                    All-Water Systems

Fin tube radiator                 Cast iron radiator
                 HVAC Systems
                  All-Water Systems

Water loop heat pump (California loop)
                     HVAC Systems
                     All-Water Systems
 Geothermal Retrofit Suitability (Rafferty, 1998)

    Loop heat pump                             10

    Radiant panel                              10

    Fan coil/unit ventilator                   7-9

    Unit heaters                                7

    Finned tube convector                       6

    Steam systems                              1-3
                   HVAC Systems
             Perimeter Electric Systems

 Geothermal Retrofit Suitability (Rafferty, 1998)

    Electric baseboard                         2

    Through-the-wall units                     1

								
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