Rosie Hospital HVAC

HVAC

Rosie Hospital HVAC

Current/OS Partners Involved:

Arriba Technologies

Location

Cambridge, UK

Setup

2023

Context

High amperage heat pumps with variable frequency drives can be coupled with the converters of rooftop solar panels and a bi-directional battery in a DC microgrid.
Heat pumps and fan-coil units already operate with an internal DC bus, using inverter technology for motor speed control. The next step is a fully DC-powered version – an innovation embraced by companies like Current/OS partner Arriba Tech. Learn more.

Implementation

Set up at Cambridge’s Rosie Hospital:

750kW facility with power converters and DC electrical system to push PV energy straight into HVAC

80kW solar array

Four 20kW DC:DC converters and two Ac:DC rectifiers

Benefits

Savings and Net-Zero achievements

Rooftop solar panels run 7% better when powering HVAC motors across a DC line

Covers up to 90% of the hospital’s needs for heating, cooling and domestic hot water.

Quote

“DC power systems are at the heart of the modern electricity landscape. DC is a natural choice for building designers when integrating photovoltaics, batteries, variable frequency drives and LED lighting. [It] massively boosts the power efficiency of commercial buildings.”

Steve Connolly, CEO Arriba Technologies

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OUTREACH

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Rosie Hospital HVAC

HVAC

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