Stroud School in Romsey : Sustainability can be learned
Keith Goldie, who is Operations Manager at Stroud School in Hampshire, has two new buildings to look after – and was clear about what he wanted: “Rather than carrying on using gas, we wanted a more sustainable solution. We looked at various options and decided on biomass. Wood is particularly suitable for our rural location, and the wood pellets can be sourced locally. This solution helps us to show the pupils at our school that there are alternatives to fossil fuels.” To heat its rooms and water, the school now uses two Hoval BioLyt (160) wood pellet boilers which are connected to two 4000 l buffer storage tanks. The system forms the heart of a new underground local heating network which supplies heat to the two new buildings and the main building. The grounds of Stroud School extend over around 80,000 m2. It is possible that further buildings will be connected to the local heating network in the future.
Pontllanfraith Secondary School in Blackwood: From coal to wood
The amount of CO2 absorbed by trees is the same as the amount released when their wood is burned. This makes biomass CO2-neutral. So it’s time to say goodbye to dirty coal! Pontllanfraith Secondary School in Wales is now using three Hoval STU (350) wood pellet boilers, and the former coal cellar has been renovated and waterproofed so that it can be used for storing wood pellets. The stoker provides precisely the amount required for the desired degree of heat. Depending on the heating requirements, one, two or all three of the boilers can be in operation at any one time. Although wood has a slightly lower calorific value than coal, the new wood pellet boilers achieve an efficiency level of 90%, compared to the 68% achieved by the former coal boilers. Furthermore, the new boilers are also easier to maintain, and the wood ash can be used as a natural fertiliser.
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