FRENSHAM MILL
SUSTAINABILITY PROJECT
FROM HISTORIC CORN MILL TO HYDROELECTRIC HOME.
  • Home
  • Hydropower
    • Live Feed
    • Estimating power potential
    • Evaluation of alternatives
    • Process
    • Need for new channel
    • Control system
    • Time series
    • Economics of hydro
    • Highs and lows
  • Heat Pumps
    • How does a heat pump work?
    • Water source heat pump
    • Economics of heat pump
  • History
    • Historical origins
    • Victorian heyday
    • Remodelling in 1928
    • Extension & Renovation 2009/12
  • Environment
    • Fish pass
    • River bank restoration
    • Wildlife
    • Overall carbon 'payback'
  • Links
  • Blog

Water source heat pump

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In a (closed) water source heat pump the cold loop of refrigerant is sent out into a heat exchanger set in the water flow.  Because of the good conduction efficiency, the scale is relatively compact compared to the lengths of piping needed for ground source heating.
Stainless steel heat exchangers were selected from the food industry for safety and longevity (but were relatively expensive)
The heat exchangers are located in the inlet channel to the 'screw' protected from debris by the same inlet screen.

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2 x 15KW Heat Pumps

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2x 15KW Viessmann heat pumps were selected.  These heat a buffer tank (on the left) upto 55C (depending on external temperatures).  This then feeds the underfloor and old radiator heating system as well as preheating the hot water (boosted by an immersion heater)

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