Water source heat pumps work in a similar way to ground source systems, except that they use an “open loop” collector where underground water such as from a well is circulated through the pipe loops.
Due to the relatively high temperature of underground water the efficiency of a water source heat pump typically exceeds 500%.
The water/water heat pump requires two well holes (delivery and return well). Warm groundwater is extracted from the delivery well and cooled down as low as 5 °C.
Water Source Heat Pumps
Afterwards it is reintroduced into the groundwater via the return well. The energy extracted from the groundwater (up to 80 %) can cover nearly 100 % of your heating requirements for a full 12 months of the year.
High-efficiency, self-contained units can be placed in virtually any location within the building and connected via a water loop. Heat is added and rejected from the loop using a boiler and a cooling tower, or using geoexchange from natural sources such as the ground, a pond or a well.
Each unit responds only to the heating or cooling load of the individual zone it serves. This provides excellent comfort levels for occupants, better control of energy use for building owners and lower seasonal operating costs.
Three types of Heat Pumps
There are three main types of heat pump available on the market, those that take heat from the ground or Ground Heat Pumps , from water (rivers or wells) or directly from the air.