A 16 kW Ochsner GMLW 19 air source heat pump was installed by IGEN in a crèche on the east coast of Ireland. It supplies the building’s total space heat and hot water requirements. The building is well insulated and has under floor heating. The floor area of the building is ~ 400m2.
Conclusions:
This measured data for this Ochsner air source heat pump shows that it is performing very well in the provision of space heating and water heating under various outdoor environmental conditions. It had an overall average SPF of 3.76 over the monitoring period which comprised of an average SPF of 3.3 for hot water and an average SPF of 4.1 for space heat.
The heat demand of the building was relatively low and can be attributed to the building insulation, under floor heating, Ochsner heat pump heating controls and the quality of installation by IGEN.
During a cold winter/spring month of the year (16th February – 16th March 2009) approximately 30% of the total demand was for hot water and 70% for space heat. The average SPF was ~ 3.6 and this comprised of an average hot water SPF of 2.75 and a space heating SPF of 4.1.
During a summer month of the year (June 2009) approximately 86% of the total demand was for hot water and 14% for space heat. The average SPF was ~ 4.8 and this comprised of an average hot water SPF of 4.5 and a space heating SPF of 6.8.
It has been shown that the cost of running a heat pump is significantly less than using natural gas, LPG or heating oil at 2009 fuel and electricity prices.
CO2 emissions are less using the heat pump and will reduce in the future as more wind energy is connected to national grid. Also they can be reduced further by using a green electricity supplier.
The study has shown that over the monitoring period an Ochsner GMLW19 air source heat pump is well suited to an Irish maritime climate in the provision of hot water and space heat to domestic and commercial buildings.
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