673 Year old Cambridge College campus heated with Euroklimat Air Source Heat Pumps
Decarbonising a complex, heritage-rich estate in the centre of Cambridge presented several key challenges: Historic Constraints: Many buildings predate modern mechanical and electrical systems and were not designed to accommodate large-scale heating infrastructure. Space Limitations: Air Source Heat Pumps (ASHPs) require significantly more space than traditional gas boilers. Operational Continuity: The College remained fully operational throughout, requiring minimal disruption to teaching and accommodation. Urban Setting: The central location imposed restrictions on access, installation
logistics, and noise levels. System Longevity: The solution needed to combine modern efficiency with proven reliability over a 20-year lifespan. In addition, a “fabric-first” approach was necessary to reduce heat demand and enable efficient heat pump operation at lower temperatures.
M&E designers Ridge and Partners developed a low-carbon heating strategy centered on Air Source Heat Pumps, working in collaboration with ICG Heat Pumps. Technology Selection: Euroklimat R290 heat pumps were chosen for their high efficiency, use of natural refrigerant (GWP = 0.02), and proven track record, with over 3,500 systems installed globally. Energy Efficiency: The system uses inverter-driven compressors and EC fans to optimise performance and reduce operational carbon. Low-Temperature Design: Through detailed monitoring of heat demand and losses, the system was designed to operate at a maximum flow temperature of 58°C—significantly improving efficiency compared to conventional systems. Strategic Location: The heat pumps were installed on the roof of the Murray Easton Building, with heat distributed via pipework beneath Trinity Street to the Old Courts. Heritage Sensitivity: Acoustic screening and careful architectural integration ensured compliance with planning and Listed Building requirements. Complementary upgrades included window replacements and removal of inefficient radiator casings, supporting reduction in heat demand.
This project demonstrates how historic institutions can successfully transition to low-carbon heating without compromising architectural heritage or operational continuity, by combining fabric improvements, advanced heat pump technology, and careful design integration.
Gonville and Caius College is setting a benchmark for sustainable retrofit in complex urban and heritage environments.
Once fully operational, the system will deliver substantial environmental benefits:
2.8 GWh reduction in annual gas consumption
508 tonnes reduction in CO2 emissions per year
Significant improvement in system efficiency (approx. 55% increase in SCOP)
The project represents a major step toward eliminating fossil fuel use across the entire college estate.
106KW Heating, 29.4kW DHW
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