Mitsubishi Air Conditioning  Mitsusbishi VRF Ground Source Heat Pumps
MITSUBISHI ELECTRIC GROUND SOURCE HEAT PUMP
A very efficient source of energy for water source heat pump systems is the Earth itself. Ground source heat pumps use the Earth’s natural solar collection and heat storage capabilities as an infinite heat source/heat sink.
At between 1.7m and 3m below the ground, the temperature changes from 17°C in the summer to 10°C in the winter. Deeper down however, the temperature of the ground is a constant 10°C all year round. It is these relatively constant, dependable temperatures that can be harnessed using ground source heat pumps.
The constant ground temperatures allow a ground source heat pump to operate at optimum efficiency in both heating and cooling, as the high summer or low winter temperatures do not influence performance. Heat is extracted or rejected into the ground using water which is pumped through a network of plastic pipes.
Mitsubishi Electric’s City Multi WR2 and WY inverter driven, ground source heat pumps can be installed in both open and closed loop configurations:
Open Loop: Large bodies of water can be utilised as a stable source of water at a relatively constant temperature. This can be either surface water or ground water. Surface water would include lakes, reservoirs, rivers and the sea.
Close Loop: Either a series of bore holes are drilled down into the ground at a depth of 50 to 130m (depending on geothermal conditions), or a Slinky application can be installed, whereby a trench is dug to a depth of between 1.7 to 3m and plastic spiral pipe is laid into the bottom.
The benefits of Ground Source Heat Pumps include:
- Higher energy efficiency and reduced CO2 emissions
- Optimised to operate at typical ground source temperatures, the Mitsubishi Electric VRF ground source system provides seasonal heating COP’s of greater than 4.5 and seasonal cooling EER’s of greater than 5.5
- A heating COP of 4.5 will give 59% less CO2 emissions than a conventional gas boiler. These significant savings can be used to offset CO2 emissions that are generated by comfort cooling
- Heat Recovery - Mitsubishi Electric is unique among ground source equipment suppliers, offering heat recovery between all air conditioned zones. Heat recovery is the transfer of heat energy to or from one area of the building to another. This innovation increases standard heat pump COP’s by up to 25%, further reducing energy consumption and CO2 emissions
- 10% renewable source of heating/cooling - Using a GSHP to provide the heating and cooling to a building will provide the 10% renewable energy required for planning permission by many local authorities and recommended in the new Part L2 Government legislation
- Higher summer operating temperatures increase power consumption and reduce cooling capacity of air source heat pumps. As the ground source system will operate at much lower temperatures (the ground being between 10 and 15°C), more capacity will be available allowing smaller plant installation.
Air source heat pumps providing heating inherently require a defrost cycle to remove accumulated ice from the exterior heat exchanger, this reduces the overall capacity available. A ground source heat pump has no defrost cycle, providing 15% more capacity when compared to the equivalent size air cooled product. Additionally in very cold regions (below -10°C) the capacity of an air sourced heat pump is reduced significantly, whereas the ground source system is unaffected by the ambient conditions
A very efficient source of energy for water source heat pump systems is the Earth itself. Ground source heat pumps use the Earth’s natural solar collection and heat storage capabilities as an infinite heat source/heat sink.
At between 1.7m and 3m below the ground, the temperature changes from 17°C in the summer to 10°C in the winter. Deeper down however, the temperature of the ground is a constant 10°C all year round. It is these relatively constant, dependable temperatures that can be harnessed using ground source heat pumps.
The constant ground temperatures allow a ground source heat pump to operate at optimum efficiency in both heating and cooling, as the high summer or low winter temperatures do not influence performance. Heat is extracted or rejected into the ground using water which is pumped through a network of plastic pipes.
Mitsubishi Electric’s City Multi WR2 and WY inverter driven, ground source heat pumps can be installed in both open and closed loop configurations:
Open Loop: Large bodies of water can be utilised as a stable source of water at a relatively constant temperature. This can be either surface water or ground water. Surface water would include lakes, reservoirs, rivers and the sea.
Close Loop: Either a series of bore holes are drilled down into the ground at a depth of 50 to 130m (depending on geothermal conditions), or a Slinky application can be installed, whereby a trench is dug to a depth of between 1.7 to 3m and plastic spiral pipe is laid into the bottom.
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