If you have a large body of water next to your home or underground in an aquifer, you can gather energy by linking it to a heat pump system. This method provides a consistent amount of energy all year round, for hot water, heating and cooling.
Maintains excellent source temperature all year round
Can be very highly efficient
Low impact on your land
How it works
Large bodies of water such as aquifers, lakes, the sea and in some instances, rivers retain heat from the sun, ground water movement and natural geothermal gradient. Whatever the season, this temperature difference can be exploited for heating and cooling your home using a Water Source Heat Pump (WSHP).
We drill a series of water wells and install a pumping and re-injection systems or install a pump system in a lake, sea or river and pump the water directly in to the heat pump. This requires specific WSHP heat exchangers within the heat pump and careful design and investigation into the water source temperatures. The heat pump itself then functions as it would for a GSHP using the refrigerant and heat exchangers to extract the energy from the well or water source and to enable this energy to be transferred in to the property.
Redesigning the way water was handled in a sensitive central London location
An open loop ground source system was underperforming until Hex Energy designed a unique solution to enable water to be taken out from - and replaced into – the same well, fully supported by the Environment Agency.
Belgravia is one of London's most exclusive addresses, and unusually, has an open loop ground source heating and cooling system in a domestic property in Eaton Place.
We were brought in to find out why the system was not performing to the required level. What we found was that the water collection part of the system was working well, but returning the water (the discharge point) had become impractical. Without another suitable location to create a well, and with discharging the water to a drain being a wasted opportunity, we came up with a better solution.
From previous experience, we knew that it was possible to create a barrier which would enable the home owner to use the same well to take and return water, whilst avoiding heat loss.
A full visual inspection (CCTV) and geophysical log of the well was completed, to understand the strength of the chalk walls of the well. This identified the size and position of fractures in the chalk walls as well as a long section of unfractured chalk. A system was designed that would use a pump and a barrier and disperse the returned water into the fractures in the wall of the well at a different horizon to the abstraction area thereby creating vertical separation within the same water well. As a contingency, a motorised valve was added so that water could be diverted if heat loss occurred.
An important part of the project was liaising with the Environment Agency. They understood the unique aspect of the project design and agreed to allow the system to run for one season as a test, with data logged and reviewed afterwards. As it happened the installation year (2013) was exceptionally hot, with temperatures in London regularly exceeding 30 degrees.
We were able to measure that the innovative design worked perfectly, exceeding all expectations. The abstraction temperature remained a constant 13.4 degrees with discharged water at 19.7 degrees Centigrade. The spent water was proven not to be mixing, despite the high temperatures.