Fast heat up Theres a Hamworthy for that. For every building theres a Hamworthy solution. All backed up by our friendly and knowledgeable team and a long-term commitment to spare parts. Halstock and Powerstock Twin coil calorifiers for flexibility and performance. Easily connects to existing or new boiler Twin coils for multiple energy sources B C Quick recovery from 13 minutes* 390 2,100 l/h continuous outputs Storage volumes 160 1000 litres Stainless steel and glass lined options calculates the cheapest source of energy. If a home has PVs, machine learning will ensure the tank is only partially charged before PVs start generating electricity during the day. Customers have the option of becoming Mixergy Heros, where the tank is automatically charged using Grid electricity when the carbon intensity is low (see Figure 3). The software makes decisions based on information from the Grids carbon intensity API. Armstrong says tests have shown that carbon emissions fall by around 16% if customers select this option. This means the tanks can take advantage of the increasing decarbonisation of the Grid as more renewables are connected. We spent a lot of time building algorithms for interpreting dynamic tariffs and automatically building schedules that take the burden of thought away from the consumer, says White. Mixergy carried out a trial comparing water heaters using MixCloud with those on Economy 7, which heats water using night-time tariffs. Assuming hot water consumption accounts for 288/year of the average householders energy bill,1 the firm says bills for tanks using MixCloud and Economy 7 are 80.30/year compared with 135/year for those just on Economy 7. With tanks connected through the cloud, the firm can carry out remote diagnostics to identify anomalies. [See panel, Remote diagnostics] Each tank has, effectively, a Linux computer controlling the heating. As the computing load is light, Mixergy is talking to Berkeley University about using spare computing capacity to contribute to Rosetta@Home life-science research. The Mixergy tanks have a 25-year warranty and Armstrong is keen to ensure they are future-proof. Mixergy tanks are heat pump ready, so while they can be installed with a system boiler today, every model is fitted with ports to accommodate a plate heat exchanger to operate in future with a heat pump. This arrangement works more efficiently than a traditional coil, says Armstrong, who claims it delivers more effective volumetric output from the same installation volume and elevates the COP of the system by anywhere between 5-10%. We need to create a product thats flexible for the low carbon transition, whether its with hydrogen boilers or heat pumps. A core ethos of ours is eliminating product obsolescence, he says. Mixergys presence in the market is growing. It has installed around 1,000 water tanks and is aiming to install 5,000 by the end of next year. CJ Reference: Updated 2021 1 At home with water, Energy Saving Trust, July 2013 REMOTE DIAGNOSTICS Call us today 01202 662500 enquiries@hamworthy-heating.com hamworthy-heating.com *Halstock recovery times for 70% of the cylinder volume @50C T - 13-22 minutes With aggregated data, Mixergy can identify what good performance looks like. It knows the shape of the tanks heat-loss curve, and can determine the difference between standing heat loss and a draw event. So, if a tank has a higher-than-average heat loss, the team knows there is an issue with insulation. Anomalies in the data can also identify leaks, limescale on the immersion heater, and whether the boiler is short-cycling. Shortcycling occurs when the boilers internal thermostat senses that the water returning from the cylinder is becoming too hot and, as a result, it switches off to avoid over-heating. Mixergy has created code that recognises short-cycling and lowers the set point temperature of the cylinder to allow the boiler to run continuously. Were using data to try to spot these boiler is short cycling, a Mixergy tank can help eliminate it, leading to water heating gas savings of up to 21%. 50 April 2021 www.cibsejournal.com CIBSE April 21 pp48-50 Mixergy smart water tank.indd 50 26/03/2021 14:52