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powerPerfector NHS trust case study

"The first assessments show that we have at least met, or even slightly improved on the initial energy saving predictions, leading us to look at further installations in some of the trusts other properties... Together with other initiatives the installations are helping the trust move towards meeting the new Carbon Reduction Commitment."—Robert Forster, estates manager for the trust.

Norfolk & Waveney NHS Mental Health Trust and Julian Hospital – powerPerfected
The trust was established in 1994 and is dedicated to the care and recovery of anyone experiencing mental ill health or substance misuse. It provides a range of specialist mental health services to nearly 800,000 people from all age ranges across Norfolk and north Suffolk. It works in partnership with other statutory and non-statutory bodies that provide services to people suffering mental ill health, and as a partnership trust it also provides integrated health and social care services. Julian Hospital is located in Norwich, Norfolk. It assesses and cares for older people with mental health problems such as dementia and depression through occupational therapy.

The challenge, the solution and the savings
After receiving the annual electricity consumption details for Julian Hospital, it was possible to give a provisional quote for a powerPerfector unit and to outline the potential for energy savings. A voltage logger was then sent for one week, which recorded the voltage level in the building by connecting it to a regular mains socket. It was found that the average voltage at the site was 245 volts (V), 15V higher than the nominal supply in the UK. After a survey of the site by a powerPerfector approved contractor, the installation took place on a Thursday.

Topline results
A very quick look at electricity usage for the week before and after installation showed an immediate drop of 11.7% in kWh consumption, but this doesn't take into consideration any other variables. Temperature has a large effect on the hospital's energy use so to take this into account the savings need to be assessed using a degree days analysis. Degree days are calculated from Met Office temperature data for regions in the UK and represent the difference in external temperature and a baseline temperature for a given period of time. This analysis showed that there was an average reduction in kWh consumption of 16.8% attributable to the powerPerfector installation (equivalent to £15,600 every year or 102,300kg in carbon dioxide emissions).

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