The Glenroyal Hotel Maynooth
Hevac were approached by Barrett’s of Maynooth to work alongside them on the extension and new leisure club for the Glenroyal Hotel in Maynooth Co. Kildare.
An outline brief dictated that there should be enough redundancy in the system that if any item of plant were to be taken “Offline”, that the occupants of the Hotel and Leisure Centre should not be inconvenienced in any way. It was decided that individual circuits should have individual boilers serving them, thus cutting down on the need for a complex control and automation system.
To this end, 4 new boilers were installed.
Chappee NXR3 boilers complete with Riello burners were chosen, as they have an excellent track record for reliability, are easy to maintain and are sturdy enough to withstand almost anything a system might throw at them. The 4 boilers serve; the Main Hotel, the Leisure Centre High Temperature system, the Leisure Centre underfloor heating system, and Leisure Centre Hot Water system. All of the water for these systems was handled by a bank of energy efficient Wilo pumps.
Because of the need for an underfloor heating matrix, Hevac brought on board their sister company, Polytherm Heating Systems. They were able to make detailed calculations and produce accurate drawings and bills of quantity for the underfloor pipework within the main pool area, the individual spa treatment rooms and changing facilities. This provided the client with a comfortable inconspicuous heating system, along with increased energy efficiency as the boilers were operating at lower temperatures.
A State of the art underfloor heating system was supplied to The Glenroyal Leisure centre and Pool area by Hevac’s sister company Polytherm Heating systems limited. The Polytherm system is characterised by its Load bearing Pipe mat which acts both as a floor stabiliser and a Pipe guiding system. Using this system the Engineer was able to guarantee that the required pipe separations and correct depth of screed above the pipes was maintained before, and most importantly, after the screening process.
State of the art Polytherm controls were installed to maintain correct air temperature on a time and temperature basis in the changing and spa areas, whilst in the pool area specialist Floor sensors maintained the floor at 29Degrees C in order to keep the floor dry around the pool perimeter. The heart of the Polytherm system is the Q4 PLC Controller. This acts as the brain of the surface regulation system ensuring that all thermostats, servomotors, Pumps and the heat source have a common wiring centre where all make and break contacts are made using stare of the art Ladder Logic software. Polytherm engineers can, on Request, modify software to take account of client’s special requests, such as Hot water priority, secondary heat source or Heat dissipation.
The hot water supply to the showers in the changing rooms presented another problem, how to produce 5000 litres of hot water per hour, have enough redundancy in the system for seamless changeover, and have a small enough profile that it did not take over the whole plant room.
The solution came with the APV plate heat exchangers. 2 were installed with 100% redundancy and took up less space within the boiler room than 1 of the Chappee NXR3 boilers! It was decided to utilise a plate and frame type exchanger, as the Hotel had it in mind to extend the membership of the Leisure Club in the future, and also it is easy to strip down the whole exchanger for cleaning and servicing.
As the hotel also wanted to extend the number of bedrooms by 45, separate boilers were installed alongside the Leisure Centre boilers.
The Client wanted to offer controlled heating to the new bedroom wing. To cut down on energy useage, the floors are individually controlled from the boiler house via reception, so if a particular floor has no occupancy, the heating to that floor can be switched off.
To serve the bathrooms within the bedroom wing, 2 State direct fired water heaters were installed, each have a capacity of 2000 litres per hour hot water production. The State units proved to be the best choice for this application as they incorporated hot water storage within their vitrified glass lined vessels and recovery times of 9 minutes from cold when the demand was high. These units negated the need for high volumes of water storage and provided high efficiency operation.
Hevac and Polytherm engineers worked closely alongside the installers of the system, ensuring that all deliveries were made to site when the installer required the materials, then at the completion of the project, all equipment was commissioned and set up to the hotels requirements.
