Walkinstown Library, Dublin

Technical information about energy saving project

The original central heating system for the building is provided by a 102 kW oil-fired boiler (Ideal Falcon, installed circa 2000), serving an underfloor heating circuit in the library and two radiator circuits in the remaining areas. The seasonal efficiency of this boiler was approx 75%. There were thermostatic radiator valves (TRV’s) installed on the radiators and a motorised mixing valve on the UFH circuit. The boiler was controlled by a time clock and room thermostats set automatically to switch on/off during winter months. DHW is provided by electric water heaters as there is a minimal domestic hot water demand.

This project required two 35kW Box Air Inverter Heat Pumps http://master- therm.ie/boxair/witharatedseasonalefficiencyof440%. Anewheaderwith variable speed circulation and electronically controlled UFH mixing valves were also installed. Existing distribution header was decommissioned.

Each of the underfloor and radiator circuits is controlled by heat pump software and are weather compensated. The System is accessed and monitored via the internet.
The System’s performance is logged in the Master Therm server. Performance and results are overviewed on a monthly basis and if necessary, adjustments are made to maximise performance and efficiency.

Plant Details