www.heatingandventilating.net


ideal conditions through manufacturers published seasonal coeffi cient of performance (SCOP) datasets. This worked example is shown right: Therefore, this outlines how simple inputs from


HDD, 12 months of gas consumption volumes, and local external temperature variations allows a forecast for an idealised heat pump system. The overall results are presented in table 1:


From the presented study, there are two obvious


conclusions: First, the utilisation of a heat pump will, under


ideal conditions, generate an incredible reduction in Scope 2 emissions. Whereby, a retrofi tted heat pump for the above worked example would reduce the CO2e emissions of the facility by ~75,778 kWh (or 57%) for heating demands. Second, the heat pump would be expected to


increase the operational costs of the facility for heating by ~£19,618.15 (54%). These fi ndings are consistent with wider scale domestic studies, such as those observed in UKRIs UK Collaborative Centre for Housing Evidence.


A better outlook via improved communication and calculation


All too common is the phrase “the heat pump didn’t work, cost an arm and a leg, so we ripped it out”. Much of the time, their operation and functions are miscalculated and poorly communicated. To enhance this, the following practices are advised: A) Properly model the system from a


performance and cost point of view. Whilst the model presented above is eff ective, it is an idealised


model utilising a desktop analysis riddled with caveats and shortcomings. Creating a digital twin of a proposed high temperature heat pump installation can minimise the pitfalls and results with a system designed to operate to its greatest capability. This overcomes what is commonly referred as the ‘Performance Gap’. B) Ensure the installation is optimised and refl ective of the most comprehensive and effi cient installation possible. Whilst meticulous and time-intensive, it will provide the best outcome. C) Accurately communicate the expected performance and costs of the installation to any stakeholder. Thus, decreasing the ‘rip-out and revert’ practice is all too commonly seen. Lastly, and importantly - heat pumps are still


a developing and emerging asset for wide-scale adoption. Their carbon savings are immense, but as the SCOP continues to improve (ideally average above 3.5 in the not distant future), the operational savings will emerge. The logistics industry should therefore take note of the impact that heat pumps can have in driving progress towards Net Zero.


Table 1 Required kWh1


Operational Cost2 kg CO2e Emissions3


Gas Boiler Heat Pump 722,309 278,668 £36,115.45 £55,733.60 132,905


57,127


1Gas boiler kWh in gas, heat pump kWh in electricity 2Gas costed at 5p/kWh, Electricity costed at 20p/


kWh. Does not include O&M upkeep. 3


CO2 emissions for gas = 0.184 kg CO2/kWh, electricity = 0.205 kg CO2e/kWh


Sustainability


Right: Dr James Crosby-


Wrigley, head of sustainability at


Advantage Utilities


Solar and heat pump integration whitepaper for sustainable heating solutions launched


Rinnai and Naked Energy have collaborated to introduce a whitepaper as a precursor to a CIBSE certifi ed CPD – the paper entitled Sustainable Synergy: Integrating Heat Pumps and Solar Thermal to Satisfy the Hot Water Needs of an archetype hotel


T


he whitepaper researches and evaluates in fi ne detail the fi nancial and operational outputs of a DHW solution comprising of


high temperature heat pumps and solar thermal collectors utilised in an obvious commercial setting – an archetypal hotel. Rinnai’s Sean Ehlen, together with Zanil Narsing of


Naked Energy, have prepared both the whitepaper and CPD to provide the detailed data for building services consultants, system designers, main HVAC contractors and installers to consider when approaching commercial property installations that require strong and sustained system effi ciency and maximized reductions in energy usage and carbon loads. Within the main body of this paper various DHW


systems operational capabilities were compared when satisfying the hot water demand of an


archetype hotel. Simulation calculators were produced to highlight how the key metrics of each DHW system compared over a 20-year period. The fi ndings of this study demonstrate how parallel dual storage SAHP’s (Solar Assisted Heat Pumps) reduce the carbon loads by 96% whilst requiring 49.5% less primary energy, compared to a conventional gas-fi red water heater system, in turn maximizing the systems effi ciency. The data extrapolated from this whitepaper further suggests that Rinnai’s parallel dual storage SAHP (Solar Assisted Heat Pumps) system can be utilised by major end-users such as institutional domains,


offi ce blocks, retail malls and chain-hotels. Contractors and consultants are now dealing with an expectation of clients’ requiring carbon reduction without diminishing performance. All sites are now expected to reduce carbon emissions whilst installing systems aligned with future building standards.


The latest CPD is part of an overall strategy that aims to


supply UK customers with detailed analysis of decarbonising technology towards commercial applications. ¡ The paper and CPD can be preregistered for at https://www.rinnai-uk.co.uk/contact-us/Solar- thermal-and-heat-pump.


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