Client: Mackintosh Sports Club – Cardiff City Centre
Mackintosh Sports Club is one of the oldest sports clubs in Cardiff offering a wide range of sporting facilities, including 5 outdoor floodlit tennis courts and bowling green.
Findings from Site Visit
Mackintosh Sports Club first dates to 1780 the year it was built, however over the years new wings were added to the original building to increase the sports and leisure facilities on offer.
At the time of visiting the club one of the newer wings was being heated by an inefficient and out dated non-modulating boiler 30+ years in age. Due to the age of the boiler, its efficiency rating would be in the region of 60%.
Most older systems suffer from black iron oxide contamination, which creates thick sludge deposits that are the result of corrosion taking place within radiators and other metallic components.
The oxide particles can range from very large to sub-micron, with the latter leaching into the system water continuously during use. These particles bond to all components, often causing premature failure of pumps and valves. When they contaminate the boiler, heat exchanger and pipe work, this results in dramatic efficiency losses. Tests have shown that even a minimal build up results in a serious drop in boiler efficiency.
Hot Water Supply
The hot water at the time was provided by a 3kw immersion heater, running 24/7, this was producing unnecessary energy bills as the club was paying to heat hot water even when not required.
Over time, the hot water storage vessel will start to show age related wear and tear. Where the water supply has a high content of dissolved minerals such as limestone, heating the water causes the minerals to precipitate in the tank; a water tank may develop leaks due to corrosion after only a few years. Dissolved oxygen in the water can also accelerate corrosion of the tank and its fittings.
Unless tanks are insulated to a modern standard, the heat loss from the storage vessel means that more energy is required not only to heat the water, but to also keep it at a temperature suitable to comply with anti-legionella regulations.
Reduce energy consumption and energy bills
Provide the club with a Hot Water on demand system
Utilise the existing pipe work already in place
OKEL Solution – Heating
To install our A rated, ECA listed twin heat exchanger boiler system, which is the most efficient within Europe (98% efficiency).
Our equipment is a Condensing boiler that uses Gas as its fuel source. As this boiler is ‘A’ rated it will provide efficient heating and hot water, subsequently reducing fuel bills and carbon dioxide emissions. This industry leading model also achieves the maximum BREEAM points for low emissions, with Nox emissions of less than 30mg/KwH
One of the hot gases produced in the combustion process is water vapour (steam). A condensing boiler extracts additional heat from the waste gases, condensing this water vapour to liquid water, thus recovering its latent heat.
In addition to the Commercial Straining System, we will also supply and fit a Plated Heat Exchanger. A heat exchanger is a device use to transfer heat from one liquid (or gas) to another: a common example is a standard coiled heat exchanger employed in indirect hot water cylinders to transfer heat from primary water to the stored water. Hot water from the boiler flows through the coil, transferring heat through the wall of the coil to the stationary water within the cylinder.
Plate Heat Exchangers have a high heat transfer rate compared to other types of heat exchangers due to their large surface area. They are composed of many thin metal plates compressed together into a ‘plate pack’ by two pressure plates.
Within a plate heat exchanger, the fluid paths alternate between plates allowing the two fluids to interact, but not mix, several times in a small area. Each plate is corrugated to increase the surface area and maximize heat transfer.
A plate heat exchanger can be fitted to provide a barrier between the “dirty” system water and the “clean” boiler water. As the water in the system and the water in the boiler are kept separate from each other, this protects the boiler from the particulates which build up over time, reducing wear and tear.
OKEL Solution – Hot Water
We proposed replacing the existing immersion heater with a modern and fully insulated 150L hot water storage vessel.
To avoid wasting energy and to comply with Building Regulations, hot water storage vessels must be insulated. The better your insulation, the longer your water will remain hot. This saves energy (reducing carbon emissions from generating heat and/or electricity) and in turn reduces the cost of maintaining a tank full of hot water.
OKEL will provide a hot water vessel incorporating the most update to construction and insulation to ensure effective and plentiful hot water for the site.
We would not propose pressurising the wet central heating system with the new boiler due to the age of the pipe-work on site. Pressurisation of this system may expose weaker areas of pipe or fitting to additional stressors resulting in leaks and loss of system pressure. The use of a plate heat exchanger will account for the difference in pressure between the boilers and the inherent pipe work.