Carlton Court Hospital part of the Norfolk and Waveney Mental Health NHS Foundation Trust case study


Courtesy of iESCo

About Carlton Court Hospital
Carlton Court Hospital is part of the Norfolk and Waveney Mental Health NHS Foundation Trust, serving the Great Yarmouth and Lowestoft areas, with a mix of elderly and adult inpatient and outpatient services, as well as Team base for the community mental health nurses. A new Adult facility completed in 2005 already contains some green credentials such as photovoltaic and solar panels, and rain water harvesting. As part of the Trust’s continued commitment to carbon reduction, a powerPerfector unit was commissioned in May 09, the installation led to an 11.6% saving in kWh and CO2. The following report outlines how these savings were demonstrated using half-hourly consumption data from the site's fiscal meter.

How powerPerfector were able to help Carlton Court Hospital
After receiving the annual electricity consumption details for Carlton Court Hospital, it was possible to give a provisional quote for the powerPerfector units 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 Hospital supply was 243 volts (V), 13V higher than the nominal supply in the UK. After a survey of the site by a powerPerfector Approved Contractor, the installation took place. Analysis following the installation showed that the reduction in average reduction in kWh consumption attributable to the powerPerfector installation was 11.6% equating to annual carbon dioxide emissions saving of 63,016kg1.

Getting the source right
powerPerfector is the world’s only Voltage Power Optimiser, giving energy, carbon and cost savings by efficiently optimising a site’s supply voltage. By optimising the voltage, electrical equipment runs more efficiently and consumes less energy. The declared electricity supply in the United Kingdom is now, as a result of European Harmonisation, 230V with a tolerance of +10% to -10%. This means that effective voltage can be anywhere between 207V and 253V depending on local conditions. Most electrical equipment manufactured for Europe and the UK is rated at 220V and operates more efficiently at this level. Forcing appliances to operate at a higher voltage in the UK (242V is the average supply level) leads to significantly higher energy consumption, increased heat losses and a reduced life span. Optimising voltage with powerPerfector brings your supply voltage to the “higher efficiency” operating range of your equipment. Without this, the ‘raw’ supply voltage to your site is likely to be at the top end of the range of voltages your electrical equipment can tolerate. As well as reducing energy consumption, this reduces the strain on your equipment, extending its lifespan according to many of our clients. It is estimated that 90% of sites in the UK are operating at too high a voltage and could therefore benefit from installing a powerPerfector.

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