Water Source Heat Pumps
The heat pump for a water source heat pump installation is the same as a heat pump for a ground source heat pump installation. The difference is in the source from which the heat pump extracts heat. A typical commercial GSHP installation will extract heat from the ground by circulating water through an array of closed loop vertical boreholes of up to 200 metres in depth: cold water from the heat pump picks up heat from the ground as it circulates through the pipes in the ground by heat exchange.
Groundwater Heat Pumps
A groundwater heat pump extacts heat from water abstracted from an underground aquifer though an open loop borehole and returns the water to the aquifer through a second discharge borehole.
Surface Water Source Heat Pumps
A surface water heat pump installation is similar, but abstracts water directly from a river or a lake and discharges it back downstream to the river.
Reasons to use a Water Source Heat Pump
The reasons to use a water source heat pump are similar to the reasons for specifying a ground source heat pump installation. Both can provide efficient heating and cooling to buildings at a low running cost and with zero emissions of carbon dioxide – or any noxious gasses – on site. Both will outlive heating systems based on combustion. However, both systems will cost more to install than heating systems based on burning gas.
Which is the optimum solution?
There are a number of considerations for your designer to juggle with depending on the heating and cooling loads of your building, location, the local geology and environmental consents. A surface water source installation may be suitable for a large building if a river or open water is accessible close by. If there is no local water it may be possible to drill down to a local aquifer to install an open loop borehole exchange system. If there is no suitable local aquifer then a closed loop borehole field array may be the optimum solution for heat exchange. In all cases professional advice will be required to design and install a system that meets the heating and cooling needs of your building for many years to come.
Code of Practice for Surface Water Source Heat Pumps
There are a number of key issues to be considered in planning to install a surface water source heat pump installation. These are highlighted in the Code of Practice for Surface Water Source Heat Pumps published jointly by CIBSE, GSHPA and the HPA. The lead authors of the Code are Nic Wincott and Jen Billings of the GSHPA and the Code can be bought from www.cibse.org/CP2.
Electronic copies are available to members of the GSHPA, without charge. Please request a copy via info@gshp.org.uk.
Code of Practice for Groundwater Heat Pumps
There are a number of key issues to be considered in planning to install a groundwater source heat pump installation. These are highlighted in the Code of Practice for Groundwater Source Heat Pumps published jointly by CIBSE, GSHPA and the HPA. The Code can be bought from CIBSE CP3.
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The GSHP Association is the focal point for business interests in the ground source heat pump industry.
We represent the ground source heating & cooling industry, promoting sustainable use of heat pump technology and engaging with government and other bodies to influence relevant policymaking on behalf of our members.