RUBY MOLLY HOTEL, DUBLIN PROJECT PROFILE
multiple Daikin VRV units, serving guest rooms, public areas and back-office spaces totalling over 300 indoor AC units. Each unit is integrated into a centralised Daikin touch manager system controller, providing precise and individualised control throughout the hotel. This system controller is seamlessly connected to the hotel’s IT network, enabling real-time monitoring and management from the front-end PC. During the setup phase, the Daikin pre-engineering tool was utilised for pre-commissioning, facilitating detailed input of floor layouts and control points for each room. In addition to the VRV systems, heating requirements are met by four 16kW Daikin Altherma Monoblock heat pumps, which are connected to a 2000L buffer tank supplying 55°C water to radiators in stairwells, corridors and other common areas, as well as the large underfloor heating system. The DHW system is powered by two 45kW Daikin Altherma heat pumps, connected to eight high-temperature modules, delivering 70°C hot water to two 2,500L storage cylinders. Hot water systems are backed up by two gas-fired water heaters. Heating and DHW circuits are managed
by Daikin ECCK8-W cascade controllers and integrated into the hotel’s BMS and IT network for streamlined control and operational efficiency. “In the interest of minimising client running costs and improving the building’s energy efficiency, Phoenix Mechanical - in consultation with Waterman Moylan - proposed an alternative design for extract and fresh air to the bedrooms,” says Willie. “The client’s design requirements were to install two large air-handling units at roof level, providing fresh air to each bedroom with extract fans at the top of each service riser from all ensuites, a system requiring plant to be running 24/7. “We designed and installed individual bedroom heat recovery units for each of the 272 bedrooms, which are key card- operated, similar to the bedroom air conditioning systems. “This ensured that the systems were only operating when the rooms were occupied, amounting to an estimated saving of 62,606kW per year in electrical usage and €25,000 in running costs.” Also delivering the water services systems, Phoenix Mechanical installed over 600 pressure-reducing valves. Each bedroom was fitted with two pressure- reducing valves (PRVs) to ensure equal
hot- and cold-water flow and pressure to thermostatic mixing valves in showers and wash hand basins. With no PRV installed on the hot water return and all hot water system PRVs installed after the tee for the return, a thermostatic balancing valve was installed at the base of each riser to ensure correct flow on the hot water return to the furthest point. “The result was optimal performance from all showers and water fixtures within the hotel, with hot water from any hot water outlet within 10 seconds of turning on,” says Willie. A mechanical services company providing complete mechanical solutions for new builds, retro fits and maintenance contracts, Phoenix Mechanical delivers high-quality installations through skilled planning, budgeting, execution and management of projects.
T: +353 (0)1 612 0083 E: info@phoenixmechanical.ie www.phoenixmechanical.ie Want to know more?
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