Bunbury City Council South West Sports Centre
Phase 1 Solar Re-diversion Project – Pool Side Amenities Hot Water System Upgrade:
Relocate 4 x existing Edwards hot water units and reuse 2. Keep remaining two as spares. Refer to drawings for specification
Install custom built Edson 1000 litre Duplex Heat Grade S/S pressure vessel.
Supply and install Grundfos CRI 15-1 50mm pump and serviceable WA Heat Exchanger plate heat exchanger connected to new Edson storage tank in preparation for Solar connection. Refer to drawings for specification.
Relocate 150mm stormwater main around new Edwards location.
Phase 2 Solar Re-diversion Project
Pool Side Amenities Solar Hot Water Heating System:
2 x 15 top rows of collectors are required (30 of total 150, being 20% of total heat energy) for the shower heating and are diverted by new thermostat controlled demand that activates 4 x 3 port valves and 1x 50mm Grundfos pump. Whilst amenities heating flow is diverted, 20% of total heat energy is disconnected from the lap pool heat exchanger. This system is designed with an overheat interlock being the original Edwards over temperature switch that will disable the circulating pump and 4 x 3 port valves that have fail safe spring returns that automatically returns solar heated flow back to normal lap pool flow pump circuit. (Note: Edwards thermostat set point to be 43°C, Solar set point 48°C and over temperature set at 50°C).
Phase 3 Solar Rediversion Project – Pool Side Spa Solar Hot Water System Pool Side Spa Solar Hot Water Heating System:
1 x 15 bottom row of existing collectors will be redirected as required by the existing BMS that operates at a spa set point of 36.4°C. When activated, 2 x 50mm 3 port valves located at existing roof top flow and return pipe system, 2 x 25mm 3 port valves located in Spa plant room (that disconnect boiler flow and returns) and 1 x 40mm Grundfos pump will divert all heat energy to the existing spa heat exchanger. Whilst spa heating flow is diverted 10% of total heat energy is disconnected from lap pool normal sola flow. When BMS set point is reached or new overtemp switch is activated, the circulating pump and 2 x 3 port valves that have fail safe spring returns automatically return solar heated flow back to lap pool flow pump circuit.