Ground source heat pumps
Ground source heat pumps are an efficient way of producing heating, cooling and hot water. Their versatility and modular installation capabilities mean they can be used for almost any new build or retro fit application.
Ground source heat pumps can extract energy from the ground or water using a closed loop or open loop collector. The size of the array is dependent on a number of factors including but not limited to the peak heating and cooling loads and usage of the building. The designing of the array to perfectly match the long term usage of the building requires the sort of experience and expertise SWES are able to provide as part of our standard scope of works.
We offer equipment as approved installation and service partners for; Dimplex, Thermia, Danfoss, Carrier, Clivet, CIAT and Climaveneta.
Is a Ground Source Heat Pump suitable?
Ground source heat pumps are the most efficient way of producing heating and hot water. A well designed system will provide a COP of 4. Meaning 1kW of electrical is used to generate 4kW of useful heat. The feasibility of ground source comes down to the amount of available ground or being able to drill a vertical bore hole. They suitable for any type of property.
What type of Ground Collector can I use?
The most common design is to use a horizontal collector buried in a trench 1.2m deep x 1m wide. This method does require a large amount of ground and can not be used to build on. A typical 3 bedroom house would require 300-400m of pipe.
If space is an issue then a vertical borehole can be drilled. The bore hole is drilled to depths of up to 150m for residential properties. One of the most important factors with drilling is to ensure a thermal grout is pumped in to remove air from around the bore hole pipe. A lot of companies do not do grout and rely on the water table which will vary throughout the year. This will cause inefficiencies in the heat pump and potential system failure.
Ground source heat pumps are generally classed as a medium temperature heat source and best applied to radiator, under floor and fan coil emitter circuits.
Most ground source heat pumps are reversible meaning they can provide active cooling to fan coils or chilled beams. It is also possible for the ground source heat pumps to provide passive cooling by directly storing the rejected thermal energy in the ground collector.
Ground source heat pumps can efficiently produce medium to high temperature hot water for sanitary use.
Ground source heat pumps can be easily integrated in to a bivalent heating system with alternative heat sources. Alternatively a solar thermal system can supplement hot water production with excess solar energy stored in the ground collector to increase efficiency during the heating season.
Ground source heat pumps can be managed locally by the heat pump manager or integrated in to a BMS using a variety of protocols; Bacnet, Lontalk, Trend.
We provide a range of ground source heat pumps solutions up to 1MW
- Feasibility study and site surveys
- System design and specification
- Thermal conductivity testing
- Thermal modelling of the ground collector
- Installation and commissioning
- Project management
- Service & breakdown support
- After sales support