Snapshot
Rinnai UK’s team of Heating & Hot Water System Designers have provided a well-recognised hotel, spa and golf resort in the north of England with plans to install one of two new systems that are proven to reduce cost, carbon emissions and improve energy efficiency.
Client Introduction
The 200-bedroom hotel, spa and golf resort went under refurbishment to add 31 executive rooms and wanted to replace their two traditional storage tank hot water systems to save carbon, reduce costs and increase system durability. By completing all refurbishments, the hotel, spa and golf resort hope to increase their rating from 4 to 5 stars.
Problem
This hotel, and many other commercial buildings, struggle with the existing space available for hot water systems so Rinnai needed to accurately size the best space saving options without compromising on performance.
Another technical consideration that’s important to the hotel industry is a heat system that emits minimal noise to not disrupt the relaxing atmosphere many hotels are looking to create for their guests. Many commercial buildings need to contend with sound legislations, depending on the area, so Rinnai also needed to provide a solution in accordance to this.
Solution
Rinnai’s design team made best practical use of the existing space and fuel infrastructure by recommending a hybrid air source heat pump system and 20% Hydrogen blend ready continuous flow gas fired water heaters. This hybrid hot water system contains a 10% heat pump prefeed which reduces the demand on the main heater, allowing for smaller heater sizing and less space for fuel storage. A heat pump prefeed also lowers the overall fuel consumption, meaning smaller tanks and fewer deliveries, which is ideal when fuel infrastructure is constrained.
Rinnai’s range of commercial air source heat pumps omit minimum acoustics via an installed ultra-low sound capability making Rinnai heat pumps suitable for any area with prohibitive sound legislation. Rinnai’s heat pumps, hybrid solar thermal and heat pumps and electrical instant and direct water heaters are part of the H3 range of products. All new models are designed to embolden decarbonisation, energy efficiency and reduce customer costs.
A key aspect of system operational performance that affects cost and system durability is energy efficiency. Replacing fossil fuels with carbon reducing energies is part of an international shift where commercial and domestic properties are embracing renewably generated energy.
Results and Benefits
Carbon savings of 267,000 kg over five years can be made by installing a Rinnai hybrid heating system when compared to a H1 gas system, as shown in the below graph.
Energy savings of 38.5% will be made upon installation of a Rinnai hybrid hot water system utilising state of the art continuous flow water heaters and LOW-GWP heat pumps. This is demonstrated in the graph below where the Rinnai UK design team have measured the savings in energy usage when comparing a Rinnai hybrid heating system to a H1 gas system.
Rinnai’s innovative heat pump systems include an ability to switch between settings of heating, hot water, and cooling, and with the recently added R290 heat pump model, can easily satisfy domestic and commercial hot water and heating requirements. The R290 is part of the innovative new range of air source heat pumps with a LOW scoring GWP (Global Warming Potential) refrigerant.
R290 allows for several operational benefits: for example, the energy efficient units enable a water temperature up to 75 degrees Celsius and R290 usage provides compliance alongside the European F-Gas Regulation which focuses on phasing down refrigerant environmental impact, as well as having a LOW-GWP of 3.
Conclusion
Rinnai UK’s design team can measure the specific requirements of any residential or commercial property and suggest an appropriate heating and hot water system that compliments the specific dimensions of each site. Rinnai is continuing to produce innovative technology that provides low carbon solutions to all UK customers across a range of applications. Call 0300 373 0660 or visit help me choose a product.
Continuous flow hot water heating from Rinnai includes two N1600 models: the N1600i (internally mounted) provides 954 litres per hour of temperature controlled hot water at 50 degrees.; the N1600e (externally mounted) is also capable delivering 954 litres per hour at 50 degrees. The two 1600s have load profiles of XXL and are water efficiency class A rated. The condensing gas fired water heaters have a 13:1 turndown ratio making them ideal for Hybrid water heating as they will modulate the gas input to suit the temperature lift required which in turn maximises renewable system gains.
Other features include: flue up to 30+ metres for concentric, turbo fan, built-in controller as standard on both internal and external models, cascade cable assembly allows up to 24 water heaters to be connected and function as one total and complete system, built in flue damper, air inlet filter, frost protection – minus 15°C on the internal versions and minus 20 °C on the external versions, new PCB design, controller as standard – lockable, set up of appliance, temperature set up to 75°C and maintenance monitor for engineers.
