Ground Source Energy
Invisible heating systems with zero on-site environmental impact
The Council of the Ground Source Heat Pump Association highlights the benefits of ground source energy in the wider context of aiming to reduce carbon emissions, combat climate change and improve air quality.
There are ten key reasons why use of Ground Source Heating is beneficial to the country as a whole:
- Ground Source Heating provides one of the most economic routes to providing on-site renewable heating, reducing emissions of greenhouse gases and meeting the government's binding targets on renewable energy.
- Ground source heat pump installations have very low running costs because they exploit the fundamental characteristic of the ground to act as an efficient store of thermal energy. In very cold weather, when heating is most needed, a ground source heat pump has access to warmer temperatures from the ground than an air source heat pump has from ambient air.
- The Thermal Energy Storage capacity of the ground allows GSHPs to be used efficiently at all hours of day and night – this provides the opportunity to use GSHPs at night when electricity is cheaper.
- GSHPs do not suffer the problems of "intermittency" that effect renewable energy from wind turbines, photovoltaic cells or solar thermal panels. Indeed the Thermal Energy Storage capacity of the ground can be used to compensate for the intermittent supply of energy from other renewable sources.
- Although ground source energy requires upfront investment, the reductions in emissions of greenhouse gases are very great and an investment in ground source energy lasts much longer than other investments in renewable energy. The ground works installed for ground source systems, a major part of the cost, can be expected to last for over 100 years. The ground source heat pumps themselves are very reliable pieces of equipment with a long life – longer than air source heat pumps which have to be located outside, have more moving parts, including air circulation fans, and need to incorporate energy-consuming defrosting elements to contend with the formation of ice in winter. GSHP installations compare favourably with all other forms of Renewable Heating and all other mechanisms for generating Renewable Electricity in terms of life span.
- Many forms of investment in renewable energy require imports as equipment like photovoltaic panels, wind turbines and solar panels come from abroad and provide employment abroad. Investment in sound ground source energy installations, which requires a detailed understanding of the local geology and local conditions, provides skilled employment in Britain for the local expertise in designing an appropriately sized system and local employment in installing the ground works.
- GSHP systems are good citizens: they are silent, free from polluting chemicals, reliable and invisible. They are welcomed by planning authorities and architects. They produce no carbon emissions on site, and none at all if powered by renewable electricity. There have never been any political objections to GSHP systems in the way that wind turbines have caused unrest and resentment and expensive government schemes on other technologies have raised eyebrows at the wisdom of excessive government spending.
- GSHP systems, uniquely amongst renewable energy technologies, offer the opportunity to recycle heat energy. Heat energy can be captured when it is freely available in the summer, stored in the ground over the autumn, and released to heat buildings in winter. This singular merit is attributable to use of the ground for Thermal Energy Storage, which is an integral part of ground source energy.
- Unlike any other form of Renewable Technology the power of a heat pump can be reversed in summer to provide cooling.
In the case of an air source heat pump (or an air conditioning chiller) heat taken out of a building
in summer is merely "wasted" to the atmosphere.
It is a very expensive option to provide cooling by heat exchange
with hot air.
The radical, renewable cooling, alternative is to use
a ground source heat pump to heat exchange
with cold ground: the primary
advantage is that it is much more efficient than heat exchanging with hot air.
The secondary advantage is that a by-product of renewable cooling is to deposit solar heat into the ground – in advance of the time in winter when the heat pump will be looking to extract heat from the ground.
- GSHP systems contribute to the Energy Security of the UK by providing heating and cooling from energy which occurs naturally in the UK, instead of relying on imported fossil fuels.