Local Authority News - Vol. 39. No. 5

Major Renewable Energy Upgrades to Milford Public Services Centre and Community Library

Donegal County Council has undertaken a major energy upgrade to Milford Public Services Centre and Community Library. The Council has installed;

• 3 No. 42.6 kW air-source heat pumps to replace oil boilers • 20 photo-voltaic solar panel to generate 6 kW of electricity • pumped cavity bead insulation to 800m2 of external walls • new efficient heating controls

The combined impact of these measures is expected to lead to a CO2 emissions reduction on site of more than 50%, and a reduction in primary energy of over 40%. In addition, the building has a new future-proof renewable energy facility and improved comfort conditions for the occupants and visitors.

Peadar Espey, Facilities Manager and DCC Energy Team member notes “the aim of this project was to make a significant practical energy upgrade and bring one of the Council’s Public Service Centres to a ‘B’ energy rating. Donegal County Council was recently recertified to the International Standard for Energy Management – ISO 50001 and continues to deliver improvements in energy use, carbon emissions and cost using this framework. This helps the authority to deliver on its own internal energy savings targets as well as the national public sector targets of 50% savings by 2030”.

Upgrades

Good practice would dictate that the heating load is first reduced before providing alternative means of heating. The improved wall insulation and heating controls were therefore applied to reduce the load. The use of the heat pumps removes oil from the site and the solar panels add a renewable energy generation.

Heat Pumps

3 no. 42.6 kW air-source heat pumps have been installed to meet the heating needs of the building. Heat pumps use refrigeration technology to provide heat efficiently so that each kWh of electricity used delivers 3 to 4 kWh of heat. A separate smaller 5 kW heat pump has been installed to provide domestic hot water. As a result, two 200 kW oil boilers have been replaced by 133 kW capacity in heat pumps, a reduction of two thirds. These units have built-in variable speed control so that capacity can adjust continuously to suit loads, thus reducing energy waste. They also adjust to outdoor temperature and use even less kWh electricity for each kWh of heat delivered when conditions are milder.

Contract Award Front (LtoR): James McCabe, FERM Engineering, Contractor, Peadar Espey, DCC Rear (LtoR): Emmett McCabe, DCC, Joe McCarron, Patrick McCaul Environmental Consulting Engineers