Reducing carbon for an indoor arena

Rinnai hot water systems are projected to produce ‘significant’ carbon reductions at a huge indoor arena in the North of England. The arena regularly hosts concerts, conferences, theatre plays, exhibitions, live music and other conventions – so it needs an energy efficient and carbon-reducing hot water system to achieve net zero.  

The arena currently uses two 116kW traditional gas-fired water heaters, with the space having a daily hot water demand of 4,377 litres.  

For the arena to decarbonise its daily operations while meeting water demand, Rinnai drew up plans for six 50kW R290 commercial heat pumps with an additional 800 litres of storage. Installing Rinnai’s High Temperature R290 commercial air source heat pumps at the indoor arena has enabled a huge 81% reduction in carbon emissions when compared to the current system.   

Rinnai’s Sean Ehlen said: “The results of this case study show that converting to a heat pump-only option can reduce the carbon emissions over five years by 81%, or 389,296kg, of CO2. By opting for a high-temperature commercial air source heat pump system the total annual energy usage required is 175,557kWh of electricity as opposed to the 478,129kWh of natural gas. 

“However, as electricity is approximately three times that of natural gas, the total operating cost of a high-temperature commercial heat pump system will be 30% more than a gas system based on government projections.”  

www.rinnai-uk.co.uk